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  • NOAA/National Centers for Coastal Ocean Science
  • 1
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    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14678 | 403 | 2014-02-24 20:59:15 | 14678 | United States National Ocean Service
    Publication Date: 2021-07-01
    Description: This report is the second in a series from a project to assess land-based sources of pollution (LBSP) and effects in the St. Thomas East End Reserves (STEER) in St. Thomas, USVI, and is the result of a collaborative effort between NOAA’s National Centers for Coastal Ocean Science, the USVI Department of Planning and Natural Resources, the University of the Virgin Islands, and The Nature Conservancy.Passive water samplers (POCIS) were deployed in the STEER in February 2012. Developed by the US Geological Survey(USGS) as a tool to detect the presence of water solublecontaminants in the environment, POCIS samplers were deployed in the STEER at five locations. In addition to the February 2012 deployment, the results from an earlier POCIS deployment in May 2010 in Turpentine Gut, a perennial freshwater stream which drains to the STEER, are also reported.A total of 26 stormwater contaminants were detected at least once during the February 2012 deployment in the STEER. Detections were high enough to estimate ambient water concentrations for nine contaminants using USGS sampling rate values. From the May 2010 deployment in Turpentine Gut, 31 stormwater contaminants were detected, and ambient water concentrations could be estimated for 17 compounds.Ambient water concentrations were estimated for a numberof contaminants including the detergent/surfactant metabolite 4-tert-octylphenol, phthalate ester plasticizers DEHP and DEP, bromoform, personal care products including menthol, indole, n,n-diethyltoluamide (DEET), along with the animal/plant sterol cholesterol, and the plant sterol beta-sitosterol. Only DEHP appeared to have exceeded a water quality guideline for the protection of aquatic organisms.
    Keywords: Chemistry ; Environment ; Pollution
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  • 2
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    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14679 | 403 | 2014-02-24 19:16:48 | 14679 | United States National Ocean Service
    Publication Date: 2021-07-01
    Description: This report contains a chemical and biological characterization of sediments from the St. Thomas East End Reserves (STEER) in St. Thomas, U.S. Virgin Islands (USVI). The STEER Management Plan (published in 2011) identified chemical contaminants and habitat loss as high or very high threats and called for a characterization of chemical contaminants as well as an assessment of their effects on natural resources. The baseline information contained in this report on chemical contaminants, toxicity and benthic infaunal community composition can be used to assess current conditions, as well as the efficacy of future restoration activities. In this phase of the project, 185 chemical contaminants, including a number of organic (e.g., hydrocarbons and pesticides) and inorganic (e.g., metals) compounds, were analyzed from 24 sites in the STEER. Sediments were also analyzed using a series of toxicity bioassays, including amphipod mortality, sea urchin fertilization impairment, and the cytochrome P450 Human Reporter Gene System (HRGS), along with a characterization of the benthic infaunal community. Higher levels of chemical contaminants were found in Mangrove Lagoon and Benner Bay in the western portion of the study area than in the eastern area. The concentrations of polychlorinated biphenyls (PCBs), DDT (dichlorodiphenyltrichloroethane), chlordane, zinc, copper, lead and mercury were above a NOAA sediment quality guideline at one or more sites, indicating impacts may be present in more sensitive species or life stages in the benthic environment. Copper at one site in Benner Bay, however, was above a NOAA guideline indicating that effects on benthic organisms were likely. The antifoulant boat hull ingredient tributyltin, or TBT, was found at the third highest concentration in the history of NOAA’s National Status and Trends (NS&T) Program, which monitors the Nation’s coastal and estuarine waters for chemical contaminants and bioeffects. Unfortunately, there do not appear to be any established sediment quality guidelines for TBT. Results of the bioassays indicated significant sediment toxicity in Mangrove Lagoon and Benner Bay using multiple tests. The benthic infaunal communities in Mangrove Lagoon and Benner Bay appeared severely diminished.
    Keywords: Chemistry ; Environment ; Pollution
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  • 3
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    NOAA/National Centers for Coastal Ocean Science | Charleston, SC
    In:  http://aquaticcommons.org/id/eprint/14710 | 403 | 2014-02-22 22:53:38 | 14710 | United States National Ocean Service
    Publication Date: 2021-07-02
    Description: Porphyrin metabolic disruption from exposure to xenobiotic contaminants such as heavy metals, dioxins, and aromatic hydrocarbons can elicit overproduction of porphyrins. Measurement of porphyrin levels, when used in conjunction with other diagnostic assays, can help elucidate an organism’s physiological condition and provide evidence for exposure to certain toxicants. A sensitive microplate fluorometric assay has been optimized for detectingtotal porphyrin levels in detergent solubilized protein extracts from symbiotic, dinoflagellate containing cnidarian tissues. The denaturing buffer used in this modified assay contains a number of potentially interfering components (e.g., sodium dodecyl sulfate (SDS), dithiothreitol (DTT), protease inhibitors, and chlorophyll from the symbiotic zooxanthellae), which required examination and validation. Examination of buffer components were validated for use in this porphyrin assay; while the use of a specific spectrofluorometric filter (excitation 400 ± 15 nm; emission 600 ± 20 nm) minimized chlorophyll interference. The detection limit for this assay is 10 fmol of total porphyrin per μg of total soluble protein and linearity is maintained up to 5000 fmol. The ability to measure total porphyrins in a SDS protein extract now allows a single extract to be used in multiple assays. This is an advantage over classical methods, particularly when tissue samples are limiting, as is often the case with coral due to availability and collection permit restrictions.
    Description: NOAA Technical Memorandum CRCP 17
    Keywords: Biology ; Chemistry ; Fisheries
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  • 4
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    NOAA/National Centers for Coastal Ocean Science | Charleston, SC
    In:  http://aquaticcommons.org/id/eprint/14759 | 403 | 2014-02-26 21:18:00 | 14759 | United States National Ocean Service
    Publication Date: 2021-07-03
    Description: The mucus surface layer of corals plays a number of integral roles in their overall health and fitness. This mucopolysaccharide coating serves as vehicle to capture food, a protective barrier against physical invasions and trauma, and serves as a medium to host a community of microorganisms distinct from the surrounding seawater. In healthy corals the associated microbial communities are known to provide antibiotics that contribute to the coral’s innate immunity and function metabolic activities such as biogeochemical cycling.Culture-dependent (Ducklow and Mitchell, 1979; Ritchie, 2006) and culture-independent methods (Rohwer, et al., 2001; Rohwer et al., 2002; Sekar et al., 2006; Hansson et al., 2009; Kellogg et al., 2009) have shown that coral mucus-associated microbial communities can change with changes in the environment and health condition of the coral. These changes may suggest that changes in the microbial associates not only reflect health status but also may assist corals in acclimating to changing environmental conditions. With the increasing availability of molecular biology tools, culture-independent methods are being used more frequently for evaluating the health of the animal host. Although culture-independent methods are able to provide more in-depth insights into the constituents of the coral surface mucus layer’s microbial community, their reliability and reproducibility rely on the initial sample collection maintaining sample integrity. In general, a sample of mucus is collected from a coral colony, either by sterile syringe or swab method (Woodley, et al., 2008), and immediately placed in a cryovial. In the case of a syringe sample, the mucus is decanted into the cryovial and the sealed tube is immediately flash-frozen in a liquid nitrogen vapor shipper (a.k.a., dry shipper). Swabs with mucus are placed in a cryovial, and the end of the swab is broken off before sealing and placing the vial in the dry shipper. The samples are then sent to a laboratory for analysis. After the initial collection and preservation of the sample, the duration of the sample voyage to a recipient laboratory is often another critical part of the sampling process, as unanticipated delays may exceed the length of time a dry shipper can remain cold, or mishandling of the shipper can cause it to exhaust prematurely. In remote areas, service by international shipping companies may be non-existent, which requires the use of an alternative preservation medium. Other methods for preserving environmental samples for microbial DNA analysis include drying on various matrices (DNA cards, swabs), or placing samples in liquid preservatives (e.g., chloroform/phenol/isoamyl alcohol, TRIzol reagent, ethanol). These methodologies eliminate the need for cold storage, however, they add expense and permitting requirements for hazardous liquid components, and the retrieval of intact microbial DNA often can be inconsistent (Dawson, et al., 1998; Rissanen et al., 2010).A method to preserve coral mucus samples without cold storage or use of hazardous solvents, while maintaining microbial DNA integrity, would be an invaluable tool for coral biologists, especially those in remote areas. Saline-saturated dimethylsulfoxide-ethylenediaminetetraacetic acid (20% DMSO-0.25M EDTA, pH 8.0), or SSDE, is a solution that has been reported to be a means of storing tissue of marine invertebrates at ambient temperatures without significant loss of nucleic acid integrity (Dawson et al., 1998, Concepcion et al., 2007). While this methodology would be a facile and inexpensive way to transport coral tissue samples, it is unclear whether the coral microbiota DNA would be adversely affected by this storage medium either by degradation of the DNA, or a bias in the DNA recovered during the extraction process created by variations in extraction efficiencies among the various community members. Tests to determine the efficacy of SSDE as an ambient temperature storage medium for coral mucus samples are presented here.
    Keywords: Chemistry ; Fisheries
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  • 5
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    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14868 | 403 | 2014-03-06 18:57:33 | 14868 | United States National Ocean Service
    Publication Date: 2021-06-27
    Description: This report presents an initial characterization of chemical contamination in coral tissues (Porites astreoides) from southwest Puerto Rico. It is the second technical report from a project to characterize chemical contaminants and assess linkages between contamination and coral condition. The first report quantified chemical contaminants in sediments from southwest Puerto Rico. This document summarizes the analysis of nearly 150 chemical contaminants in coral tissues. Although only eight coral samples were collected, some observations can be made on the correlations between observed tissue and sediment contaminant concentrations. The concentrations of polycyclic aromatic hydrocarbons (PAHs), typically associated with petroleum spills and the combustion of fossil fuels, and polychlorinated biphenyls (PCBs) in the coral tissues were comparable to concentrations found in adjacent sediments. However, the concentration of a chemical contaminant (e.g., PAHs) in the coral tissues at a particular site was not a good predictor of what was in the adjacent sediments. In addition, the types of PAHs found in the coral tissues were somewhat different (higher ratios of alkylated PAHs) than in sediments. The levels of PCBs and DDT in coral tissues appeared higher just outside of Guanica Bay, and there was evidence of a downstream concentration gradient for these two contaminant classes. The trace elements copper, zinc and nickel were frequently detected in coral tissues, and the concentration in the corals was usually comparable to that found in adjacent sediments. Chromium was an exception in that it was not detected in any of the coral tissues analyzed. Additional work is needed to assess how spatial patterns in chemical contamination affect coral condition, abundance and distribution.
    Description: National Status and Trends Program for Marine Environmental Quality
    Keywords: Chemistry ; Management ; Pollution
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  • 6
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    NOAA/National Centers for Coastal Ocean Science | Charleston, SC
    In:  http://aquaticcommons.org/id/eprint/14864 | 403 | 2014-03-06 18:36:18 | 14864 | United States National Ocean Service
    Publication Date: 2021-06-27
    Description: Models that help predict fecal coliform bacteria (FCB) levels in environmental waters can be important tools for resource managers. In this study, we used animal activity along with antibiotic resistance analysis (ARA), land cover, and other variables to build models that predict bacteria levels in coastal ponds that discharge into an estuary. Photographic wildlife monitoring was used to estimate terrestrial and aquatic wildlife activity prior to sampling. Increased duck activity was an important predictor of increased FCB in coastal ponds. Terrestrial animals like deer and raccoon, although abundant, were not significant in our model. Various land cover types, rainfall, tide, solar irradiation, air temperature, and season parameters, in combination with duck activity, were significant predictors of increased FCB. It appears that tidal ponds allow for settling of bacteria under most conditions. We propose that these models can be used to test different development styles and wildlife management techniques to reduce bacterial loading into downstream shellfish harvesting and contact recreation areas.
    Keywords: Chemistry ; Ecology ; Management ; Pollution
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  • 7
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    NOAA/National Centers for Coastal Ocean Science | Oxford, MD
    In:  http://aquaticcommons.org/id/eprint/14949 | 403 | 2014-03-14 22:55:57 | 14949 | United States National Ocean Service
    Publication Date: 2021-06-29
    Description: Investigators at the Cooperative Oxford Laboratory (COL) diagnose and study crustaceans, mollusks, finfish, and a variety of other marine and estuarine invertebrates to assess animal health. This edition updates the Histological Techniques for Marine Bivalve Mollusks manual by Howard and Smith (1983) with additional chapters on molluscan and crustacean techniques. The new edition is intended to serve as a guide for histological processing of shellfish, principally bivalve mollusks and crustaceans. Basically, the techniques included are applicable for histopathological preparation of all marine animals, recognizing however that initial necropsy is unique to each species. Photographs and illustrations are provided for instruction on necropsy of different species to simplify the processing of tissues. Several of the procedures described are adaptations developed by the COL staff. They represent techniques based on principles establishedfor the histopathologic study of mammalian and other vertebrate tissues, but modified for marine and aquatic invertebrates. Although the manual attempts to provide adequate information on techniques, it is also intended to serve as a useful reference source to those interested in the pathology of marine animals. General references and recommended reading listed in the back of the manual will provide histological information on species not addressed in the text.
    Description: This edition updates the Histological Techniques for Marine Bivalve Mollusks manual by Howard and Smith (1983) with additional chapters on molluscan and crustacean techniques.
    Keywords: Chemistry ; Fisheries
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  • 8
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    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14947 | 403 | 2014-03-14 23:06:34 | 14947 | United States National Ocean Service
    Publication Date: 2021-06-29
    Description: This chapter describes the procedures for determining the reproductive stage of oysters, mytilid mussels, and dreissenid mussels collected for NOAA’s National Status and Trends Mussel Watch Project. Analyses are conducted on paraffin-embedded tissues sectioned at a 5-μm thickness and stained using a pentachrome staining procedure. Each slide is examined microscopically to determine the animal’s sex and stage of gonadal development. A semi-quantitative ranking is assigned.
    Keywords: Chemistry ; Fisheries ; Pollution
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  • 9
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    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23422 | 19325 | 2018-04-25 19:24:46 | 23422 | Fisheries Society of Nigeria
    Publication Date: 2021-07-14
    Description: Tilapia guineensis eggs were spawned and hatched in different salinities (17, 12, 7, 5, 2 and 0) ppt. The study was conducted in eight replicates. The aim of the investigation was to ascertain disparity in hatching size of Tilapia guineensis attributable to salinity. Immediately hatching was observed, body weight of five hatchlings in each replicate was individually weighed in milligramme. The individual total length of the five hatchlings was also measured in millimeter. The height of the yolk sac larva was determined with micro-metre screw gauge graduated in millimeter from the top of the yolk sac to the dorsal region of the larva. Data obtained were used to calculate yolk sac volume. Significant differences (P〈0.01) were observed in body weight and total length of larvae hatched in different salinities. The heaviest and longest larvae were hatched in 12 ppt saline water. The yolk sac volume of larvae hatched in lower salinities were significantly higher (P〈0.01) than the yolk sac volume of larvae hatched in higher salinities. The smallest yolk sac volume was recorded in 12ppt saline water. Our findings show that salinity could be manipulated for economic production of heavier seeds of Tilapia.
    Description: Includes:- 5 tables.;6 refs.
    Keywords: Aquaculture ; Chemistry ; Tilapia guineensis ; Nigeria ; brackishwater environment ; Salinity effects ; Larvae
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  • 10
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    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23440 | 19325 | 2018-05-02 08:25:12 | 23440 | Fisheries Society of Nigeria
    Publication Date: 2021-07-14
    Description: The physical and chemical parameters of ABU Dam and Zaria Dam were carried out between September and October 2009. The results obtained in the two water bodies were temperature 27.7 0C, pH (7.5 and 7.3), dissolved oxygen (5.8 mg/l and 5.0 mg/l), biochemical oxygen demand (1.74 mg/l and 2. 16 mg/l), alkalinity (58 mg CaC03/l and 49 mgCaCO3/l) P04-P (2.47 mg/l and 1.59 mg/l) NO3-N (3.67 mg/l and 3.47 mg/l), conductivity (54.70 ~ks-1 and 42.48 ~ks-1), total hydrocarbon (TH) (47.66 mg/l) and 48.00 mg/l) and total dissolved solids (32.68 mg/l and 25.35 mg/l) respectively. There was no significant difference in the mean values of the parameters (P〉0.05) except conductivity and total dissolved solids. The water bodies were found to be neutral with high conductivity. All the properties in the water bodies were in conformity with international standards both for drinking and aquatic life.
    Description: Includes:- 2 tables.;7 refs.
    Keywords: Chemistry ; Limnology ; Pollution ; Nigeria ; Zaria Dam ; Nigeria ; ABU Dam ; freshwater environment ; Physicochemical properties ; Pollution
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  • 11
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    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23442 | 19325 | 2018-05-02 08:28:15 | 23442 | Fisheries Society of Nigeria
    Publication Date: 2021-07-14
    Description: In recent times there has been an upsurge in the culture of Tilapia in Nigeria resulting in increased demand for the fingerlings which is hardly satisfied. This is due to increasing demand for table size tilapia as food fish and under-sized tilapia in the fish meal and fish canning industries in Nigeria. Collection of Tilapia guineensis fingerlings from the wild, to augment hatchery production, has been the practice and this is subject to environmental fluctuations. Multivariate regression and correlation analyses of accumulated data were used to investigate the effects of changes in water quality parameters on abundance of fingerlings of Tilapia guineensis in a brackishwater habitat in Lagos. Dissolved oxygen (DO), salinity and secchi transparency were found to be the most dominant factors affecting the abundance of Tilapia guineensis fingerlings in the Lagos lagoon. Peak period of abundance was closely associated with period of low salinity (0.50%o to 5.60%o), which coincided with the period of low transparency and low DO in the rainy season. The correlation analyses of Tilapia guineensis fingerlings with the water quality parameters yielded the following correlation coefficients (r)- 0.598; (salinity); -0.644 (transparency); -0.710 (DO); -0.566; (temperature) and 0.129 (pH). The abundance of Tilapia guineensis fingerlings in the Lagoon was ultimately defined by a suitable regression equation. This result is expected to optimize the collection of fingerlings of Tilapia guineensis from the wild and boost food fish security in Nigeria and elsewhere.
    Description: Includes:- 1 table.;1 fig.;( refs.
    Keywords: Chemistry ; Fisheries ; Tilapia guineensis ; Nigeria ; Port Harcourt ; brackishwater environment ; Water quality ; Fingerlings ; Chemical properties ; Physicochemical properties
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  • 12
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    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23445 | 19325 | 2018-05-02 08:32:33 | 23445 | Fisheries Society of Nigeria
    Publication Date: 2021-07-14
    Description: Spatial and temporal variations of physico-chemical variables of Onu-Iyi ?Ukwu stream were studied for 12 months from March 2005 to February 2006. Three sampling stations were established along the main stream channel from source to mouth. Spatial variation in physico-chemical parameters indicated that total alkalinity, total hardness, conductivity, and nitrate-nitrogen (NO3) recorded their highest values at the upper reaches (with values 14.0mg/l, 88.09mg/l, 17.00~kscmiscm, and 0.60mg/l respectively). Dissolved Oxygen (DO) and pH had their maximum values of 8.20mg/l and 6.94 at the middle reaches. Turbidity, biochemical oxygen demand (BOD), temperature and phosphate-phosphorus (PO4) increased steadily from source to mouth. The observed seasonal variation indicated that wet season values were higher for all the parameters except temperature, turbidity, phosphate-phosphorus (PO4) and total alkalinity although the values were not statistically significant at p〉0.05. The correlation coefficient (r) showed no significant relationships p〈0.05 between physico-chemical parameters except DO and BOD with correlation values of (0.75 and -0.54) respectively.
    Description: includes:- 2 tables.;1 fig.;17 refs.
    Keywords: Chemistry ; Limnology ; Nigeria ; Onu-Iyi-Uku Stream ; freshwater environment ; Physicochemical properties ; Phosphates ; Phosphorus ; Turbidity
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  • 13
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    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23449 | 19325 | 2018-05-02 08:39:20 | 23449 | Fisheries Society of Nigeria
    Publication Date: 2021-07-14
    Description: The physico-chemical parameters of Bosso Dam were analyzed weekly for a period of six (6) weeks from 29th October, 2009. In all, six (6) stations were identified within the dam. The physico-chemical parameters assessed were: temperature, dissolved oxygen, pH, alkalinity, hardness, conductivity and transparency. The results obtained from the analysis revealed slight variations in most parameters. There was no significant difference p〉0.05 in pH regardless of stations and weeks. But significant difference p〉0.05 were observed in dissolved oxygen, nitrate, temperature, conductivity, hardness, alkalinity, biological oxygen demand, transparency, in respect regard to stations. These variations could be due to influx of organic waste from surface run offs and inorganic waste deposited by man. The physico-chemical parameters observed, indicated that most of them fall with the recommended range or standard by the Federal Ministry of Environment
    Description: Includes:- 2 tables.;10 figs.;18 refs.
    Keywords: Chemistry ; Limnology ; Nigeria ; Bosso dam ; freshwater environment ; Physicochemical properties ; Chemical properties ; Physical properties ; Water properties
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  • 14
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    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24590 | 19325 | 2018-05-20 16:05:58 | 24590 | Fisheries Society of Nigeria
    Publication Date: 2021-07-15
    Description: The water analysis of five selected ponds in Ado-Ekiti in Ekiti State, was carried out to determine their suitability for fish culture. Pa rameters analyzed were: Temperature, Turbidity, Carbon (IV) oxide, Alkalinity, Hardness, pH and Dissolved oxygen. Values for temperature ranged between 20.0~'C and 29.0~'C, Turbidity values were between 46.0-50.2cm, Carbon (IV) oxide: 11.5-12.2mg/litre; alkalinity: 100-120mg/liter; hardness: 110-200mg/litre; pH: 6.8-7.8 and dissolved oxygen: 5.8-6.8mg/liter. The values obtained were found to be within acceptable range for fish production.
    Description: Includes: 10 references.
    Keywords: Aquaculture ; Chemistry ; Nigeria ; Physico-chemical parameter ; Fish pond ; Ado-Ekiti ; Fish production ; freshwater environment ; automation
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  • 15
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    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24618 | 19325 | 2018-05-22 06:12:36 | 24618 | Fisheries Society of Nigeria
    Publication Date: 2021-07-15
    Description: One of the priority research projects of the Nigerian Institute for Oceanography and Marine Research (NIOMR) is broodstock development and mass propagation of silver catfish, Chrysichthys nigrodigitatus of which the broodstock is naturally abundant in New Gala River. Selected physical characteristics and water physico-chemical parameters of the upper reach of the New Calabar River at Aluu were investigated. The highest depth value of 9.20 m was recorded in the middle of the river. The width of the river measured during spring high tide and low tide were 174 m and 110 m respectively. The cross-sectional area and average flow velocity of the river were 797.13 m2 and 0.374 m/s respectively. The discharge of the river was computed as 298.13m3/s. The river water was acidic most of the period (Hydrogen ion concentration, pH: 5.12 to 7.43), with low total alkalinity values (4.00 to 12.00 mgCaCO3/L) and low total hardness values (11.5 to 51.2 mgCaCO3/L) which indicate that the river water is black and soft. There was significant (p~,0.05) seasonal variation in temperature (23.1 to 31.7~'C\}, Secchi transparency (9.30 to 19.00 cm), total hardness (11.5 to 51.2 mgCaCO3/L), dissolved oxygen (5.20 to 7.50 mg/L) and dissolved oxygen deficit (0.02 to 2.95mg/L). These results are useful for several stake holders who use the river as a sink for trade wastes, as source of water for fish farming, as source of broodstocks of Chrysichthys nigrodigitatus, as raw water for water treatment plants, and as means of transportation of industrial materials.
    Description: Includes: 16 references.
    Keywords: Chemistry ; Fisheries ; Limnology ; Chrysichthys nigrodigitatus ; Nigeria ; New Calabar River ; New calabar River ; Physical characteristics and physico-chemical features ; Seasonal variation ; freshwater environment ; automation
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  • 16
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    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24619 | 19325 | 2018-05-22 06:14:16 | 24619 | Fisheries Society of Nigeria
    Publication Date: 2021-07-15
    Description: Eight month physicochemical study of Dadin Kowa Dam was carried out forthnightly from July, 2011 to february 2012. Air temperature ranged from 18.25~'C ~c 28~'C ~c 0.50 to 28~'C ~c 2.16. Water tmperature ranged from 18.75~'C ~c 2.21. Transparency ranged from 11.00cm ~c 1.83 to 29.63 cm ~c ~c 2.14. Conductivity ranged from 13.00~Ks/cm ~c 13.33 to 41.38~Ks/cm ~c 5.54. Hydrogen ion (pH) ranged from 6.69 ~c 1.03 to 8.39 ~c 1.17. Dissolved oxygen ranged from 6.39mg/l ~c 1.03 to 10.14mg/l ~c 1.17. Total alkalinity ranged from o.69mg/l ~c 0.38 1.34mb/l ~c 0.02. Total ammonia ranged from 0.20mg/l ~c 0.027 to 0.83mg/l ~c 0.05. There were various levels of correlation between these parameters. There was no significant difference between both sites and months (p〉0.05) of all the parameters except total nitrogen which show a significant difference between the sites (p〈0.05) and transparency also shows a significance between the months (p〈0.05). All physicochemical parameters were almost within the tolerable limits for supporting aquatic life.
    Description: Includes: 27 references.
    Keywords: Fisheries ; Chemistry ; Nigeria ; Dadin Kowa Dam ; Physico-chemical parameters ; Fish production ; Dadin Kowa Dam ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
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  • 17
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    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23460 | 19325 | 2018-05-05 12:31:34 | 23460 | Fisheries Society of Nigeria
    Publication Date: 2021-07-14
    Description: The morphometric characters of Cynothrissa mento from three major Lagoons (Ologe, Badagry and Epe) in Lagos, Nigeria were compared to assess the possibility of this fish species from the three Lagoons belonging to the same sub-population. The length-weight relationships (LWR), and condition factors (CF) of the fish were also described as well as the physico-chemical parameters of the three water bodies. The study was conducted between May, 2009 and April, 2010 and monthly sampling of fish and water was done in each sampling site. Seven7 physico-chemical parameters were assessed and these are; temperature, pH, salinity, turbidity, dissolved oxygen, total alkalinity and total hardness. A total of 294 specimens (Ologe 60, Badagry 174 and Epe 60) of C. mento were collected from the landings of the local fisher folks from the sampling sites. Seven morphometric characters; total length (TL), standard length (SL), body depth (BD), head length (HL), head depth (HD), eye diameter (ED) and interorbital width (IW) were measured. There was no significant difference (p 〉 0.05) in all the physico-chemical parameters measured among the sampling sites except pH. Coefficient of difference revealed that the C. mento from the three lagoons are uniform in all the morphometric parameters examined, which means that the specimens from the three sampling sites do not belong to different sub-populations. The growth coefficient/slope (b) values obtained for the fish species from the sampling sites ranged from 2.27 - 2.53, and differed significantly (p 〈 0.05) from 3, which indicates that most of the fish species have negative algometric growth.
    Description: Includes:- 4 tables.;1 fig.;24 refs.
    Keywords: Ecology ; Chemistry ; Cynothrissa mento ; Nigeria ; Ologe Lagoon ; Nigeria ; Badagry Lagoon ; Nigeria Epe Lagoon ; marine environment ; Population dynamics ; Morphometry ; Check lists ; Length-weight relationships ; Condition factor ; Physicochemical properties
    Repository Name: AquaDocs
    Type: conference_item , TRUE
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  • 18
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    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24638 | 19325 | 2018-05-24 09:36:38 | 24638 | Fisheries Society of Nigeria
    Publication Date: 2021-07-15
    Description: Study of some Physico-chemical parameters and fish species composition of Doma Darn was carried out between the month of August 2012. Fishing communities along the dam were selected at sampling stations and collection of fish species. The values of physico-parameters obtained for stations were in the range of 28.10-92 m for depth, 27.70-28.48~'for temperature, 7.03-7.64 for PH, 7.23-7.64mg/l for dissolved oxygen (DO), 30.08-31.75 ntu for turbidity, 94.64-105.17mg/l for alkalinity and 79.17-80.58mg/l for total hardness. The result indicated that there was significant difference (p〈0.5)for depth, temperature turbidity and alkalinity, while there was no significant difference (p〈0.05) for DO, pH and water hardness among the stations. The result of these parameters among the duration shows that there was significant different (p〈0.05) in all the parameters except pH. The study revealed that there were twenty-five (25) fish species belonging to 12 families in the dam. The family Cichlidae and Mochokidae and Bagridae which has three each, While the family, Polypteridae, Channidae, Centropomidae, flepsetidae and Protopteridae has the lowest number of one (1) each. The overall result revealed that the Phvsico-chemical parameters were mostly influenced by duration and not much by stations; and parametersoaram measured were within the recommended water quality requirement for growth and survival of aquatic organisms.
    Description: Includes: 10 references.
    Keywords: Chemistry ; Fisheries ; Nigeria ; Doma Dam ; Doma Dam ; Fishing community ; Physico-chemical parameter ; Fish species ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
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  • 19
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    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/2232 | 403 | 2014-02-21 01:55:57 | 2232 | United States National Ocean Service
    Publication Date: 2021-07-12
    Description: Executive Summary:Information found in this report covers the years 1986 through 2005. Mussel Watch began monitoring a suite of trace metals and organic contaminants such as DDT, PCBs and PAHs. Through time additional chemicals were added, and today approximately 140 analytes are monitored. The Mussel Watch Program is the longest running estuarine and coastal pollutant monitoring effort conducted in the United States that is national in scope each year. Hundreds of scientific journal articles and technical reports based on Mussel Watch data have been written; however, this report is the first that presents local, regional and national findingsacross all years in a Quick Reference format, suitable for use by policy makers, scientists, resource managers and the general public.Pollution often starts at the local scale where high concentrations point to a specific source of contamination, yet some contaminants such as PCBs are atmospherically transported across regional and national scales, resulting in contamination far from their origin. Findings presented here showed few national trends for trace metals and decreasing trends for most organic contaminants; however, a wide variety of trends, both increasing and decreasing, emerge at regional and local levels. For most organic contaminants, trends have resulted from state andfederal regulation. The highest concentrations for both metal and organic contaminants are found near urban and industrial areas.In addition to monitoring throughout the nation’s coastal shores and Great Lakes, Mussel Watch samples are stored in a specimen bank so that trends can be determined retrospectively for new and emerging contaminants ofconcern. For example, there is heightened awareness of a group of flame retardants that are finding their way into the marine environment. These compounds, known as polybrominated diphenyl ethers (PBDEs), are now being studied using historic samples from the specimen bank and current samples to determine their spatial distribution. We will continue to use this kind of investigation to assess new contaminant threats.We hope you find this document to be valuable, and thatyou continue to look towards the Mussel Watch Programfor information on the condition of your coastal waters. (PDF contains 118 pages)
    Description: Center for Coastal Monitoring and Assessment
    Keywords: Ecology ; Pollution ; Environment ; Chemistry
    Repository Name: AquaDocs
    Type: monograph
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    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/2156 | 403 | 2014-02-21 20:21:25 | 2156 | United States National Ocean Service
    Publication Date: 2021-07-12
    Description: This report summarizes the results of a characterizationof chemical contaminants in the sediments in southwestPuerto Rico. The report is part of a project to integratevarious analytical specialties to assess linkages betweenchemical contaminants and the condition of coral reefs. In this phase of the project, over 120 chemical contaminants were analyzed in sediments collected, including a number of organic (e.g., hydrocarbons), inorganic (e.g., metals), and biological (bacterial) compounds/analytes. The report also provides a preliminary analysis of the association betweensediment contaminants and coral species richness.Overall, the levels of chemical contaminants in the study area between Guanica Bay and the town of La Parguera were fairly low. At most of the sites sampled, particularlyadjacent to the town of La Parguera, concentrations oforganic and inorganic contaminants were below the median values from NOAA’s National Status and Trends Program, which monitors the Nation’s coastal and estuarine waters for chemical contaminants. Elevated levels of a number of contaminant classes were seen at the two sites sampled within Guanica Bay.An initial analysis of modeled PAH (hydrocarbon) data and coral species richness (reef building species) indicated a strong negative correlation between the presence of PAHs in the sediments and coral species richness. Additional work is needed to assess possible reasons for this observed pattern. (PDF contains 126 pages).
    Description: Center for Coastal Monitoring and Assessment
    Keywords: Ecology ; Management ; Environment ; Chemistry
    Repository Name: AquaDocs
    Type: monograph
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  • 21
    Publication Date: 2016-01-21
    Description: Bacteria express many small RNAs for which the regulatory roles in pathogenesis have remained poorly understood due to a paucity of robust phenotypes in standard virulence assays. Here we use a generic 'dual RNA-seq' approach to profile RNA expression simultaneously in pathogen and host during Salmonella enterica serovar Typhimurium infection and reveal the molecular impact of bacterial riboregulators. We identify a PhoP-activated small RNA, PinT, which upon bacterial internalization temporally controls the expression of both invasion-associated effectors and virulence genes required for intracellular survival. This riboregulatory activity causes pervasive changes in coding and noncoding transcripts of the host. Interspecies correlation analysis links PinT to host cell JAK-STAT signalling, and we identify infection-specific alterations in multiple long noncoding RNAs. Our study provides a paradigm for a sensitive RNA-based analysis of intracellular bacterial pathogens and their hosts without physical separation, as well as a new discovery route for hidden functions of pathogen genes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Westermann, Alexander J -- Forstner, Konrad U -- Amman, Fabian -- Barquist, Lars -- Chao, Yanjie -- Schulte, Leon N -- Muller, Lydia -- Reinhardt, Richard -- Stadler, Peter F -- Vogel, Jorg -- England -- Nature. 2016 Jan 28;529(7587):496-501. doi: 10.1038/nature16547. Epub 2016 Jan 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Wurzburg, RNA Biology Group, Institute for Molecular Infection Biology, Josef-Schneider-Strasse 2/D15, D-97080 Wurzburg, Germany. ; University of Wurzburg, Core Unit Systems Medicine, Josef-Schneider-Strasse 2/D15, D-97080 Wurzburg, Germany. ; University of Leipzig, Department of Computer Science and Interdisciplinary Center for Bioinformatics, Hartelstrasse 16-18, D-04107 Leipzig, Germany. ; University of Vienna, Theoretical Biochemistry Group, Institute for Theoretical Chemistry, Wahringer Strasse 17, A-1090 Vienna, Austria. ; Max Planck Genome Centre Cologne, Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, D-50829 Cologne, Germany. ; Max Planck Institute for Mathematics in the Sciences, Inselstrasse 22, D-04103 Leipzig, Germany. ; Santa Fe Institute, 1399 Hyde Park Rd, Santa Fe, New Mexico 87501, USA. ; Research Centre for Infectious Diseases (ZINF), University of Wurzburg, D-97070 Wurzburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26789254" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Proteins/metabolism ; Female ; Gene Expression Regulation/*genetics ; Genes, Bacterial/genetics ; HeLa Cells ; Host-Pathogen Interactions/*genetics ; Humans ; Janus Kinases/metabolism ; Mice ; Microbial Viability/genetics ; RNA, Bacterial/*genetics/metabolism ; RNA, Messenger/genetics/metabolism ; RNA, Untranslated/*genetics/metabolism ; STAT Transcription Factors/metabolism ; Salmonella typhimurium/cytology/*genetics/pathogenicity ; Signal Transduction/genetics ; Transcriptome/genetics ; Virulence/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 22
    Publication Date: 2016-03-24
    Description: Developmental disabilities, including attention-deficit hyperactivity disorder (ADHD), intellectual disability (ID), and autism spectrum disorders (ASD), affect one in six children in the USA. Recently, gene mutations in patched domain containing 1 (PTCHD1) have been found in ~1% of patients with ID and ASD. Individuals with PTCHD1 deletion show symptoms of ADHD, sleep disruption, hypotonia, aggression, ASD, and ID. Although PTCHD1 is probably critical for normal development, the connection between its deletion and the ensuing behavioural defects is poorly understood. Here we report that during early post-natal development, mouse Ptchd1 is selectively expressed in the thalamic reticular nucleus (TRN), a group of GABAergic neurons that regulate thalamocortical transmission, sleep rhythms, and attention. Ptchd1 deletion attenuates TRN activity through mechanisms involving small conductance calcium-dependent potassium currents (SK). TRN-restricted deletion of Ptchd1 leads to attention deficits and hyperactivity, both of which are rescued by pharmacological augmentation of SK channel activity. Global Ptchd1 deletion recapitulates learning impairment, hyper-aggression, and motor defects, all of which are insensitive to SK pharmacological targeting and not found in the TRN-restricted deletion mouse. This study maps clinically relevant behavioural phenotypes onto TRN dysfunction in a human disease model, while also identifying molecular and circuit targets for intervention.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4875756/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4875756/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wells, Michael F -- Wimmer, Ralf D -- Schmitt, L Ian -- Feng, Guoping -- Halassa, Michael M -- F31 MH098641/MH/NIMH NIH HHS/ -- R00 NS078115/NS/NINDS NIH HHS/ -- R01 MH097104/MH/NIMH NIH HHS/ -- R01 MH107680/MH/NIMH NIH HHS/ -- R01MH097104/MH/NIMH NIH HHS/ -- R01MH10768/MH/NIMH NIH HHS/ -- England -- Nature. 2016 Apr 7;532(7597):58-63. doi: 10.1038/nature17427. Epub 2016 Mar 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Duke University Medical Center, Durham, North Carolina 27710, USA. ; McGovern Institute for Brain Research, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. ; Neuroscience Institute, New York University Langone Medical Center, New York, New York 10016, USA. ; Department of Neuroscience and Physiology, New York University Langone Medical Center, New York, New York 10016, USA. ; Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, USA. ; Department of Psychiatry, New York University Langone Medical Center, New York, New York 10016, USA. ; Center for Neural Science, New York University, New York, New York 1003, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27007844" target="_blank"〉PubMed〈/a〉
    Keywords: Aggression ; Animals ; Animals, Newborn ; Attention ; Attention Deficit Disorder with ; Hyperactivity/genetics/*physiopathology/*psychology ; Behavior, Animal ; Disease Models, Animal ; Electric Conductivity ; Female ; GABAergic Neurons/metabolism/pathology ; *Gene Deletion ; Humans ; Learning Disorders/genetics/physiopathology ; Male ; Membrane Proteins/*deficiency/*genetics/metabolism ; Mice ; Mice, Knockout ; Motor Disorders/genetics/physiopathology ; Neural Inhibition ; Potassium Channels, Calcium-Activated/metabolism ; Sleep ; Sleep Deprivation/genetics/physiopathology ; Thalamic Nuclei/pathology/*physiopathology
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  • 23
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    Nature Publishing Group (NPG)
    Publication Date: 2016-05-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Owens, Brian -- England -- Nature. 2016 May 11;533(7602):S71-2. doi: 10.1038/533S71a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27167398" target="_blank"〉PubMed〈/a〉
    Keywords: *Academies and Institutes/economics ; *Access to Information ; Animals ; *Diffusion of Innovation ; Drug Industry/economics/methods ; Humans ; *Information Dissemination ; Mice ; Neurosciences/economics/manpower/*methods/organization & administration ; Patents as Topic ; Public Sector/economics ; Public-Private Sector Partnerships ; Quebec
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  • 24
    Publication Date: 2016-01-07
    Description: Endothelial cells (ECs) are plastic cells that can switch between growth states with different bioenergetic and biosynthetic requirements. Although quiescent in most healthy tissues, ECs divide and migrate rapidly upon proangiogenic stimulation. Adjusting endothelial metabolism to the growth state is central to normal vessel growth and function, yet it is poorly understood at the molecular level. Here we report that the forkhead box O (FOXO) transcription factor FOXO1 is an essential regulator of vascular growth that couples metabolic and proliferative activities in ECs. Endothelial-restricted deletion of FOXO1 in mice induces a profound increase in EC proliferation that interferes with coordinated sprouting, thereby causing hyperplasia and vessel enlargement. Conversely, forced expression of FOXO1 restricts vascular expansion and leads to vessel thinning and hypobranching. We find that FOXO1 acts as a gatekeeper of endothelial quiescence, which decelerates metabolic activity by reducing glycolysis and mitochondrial respiration. Mechanistically, FOXO1 suppresses signalling by MYC (also known as c-MYC), a powerful driver of anabolic metabolism and growth. MYC ablation impairs glycolysis, mitochondrial function and proliferation of ECs while its EC-specific overexpression fuels these processes. Moreover, restoration of MYC signalling in FOXO1-overexpressing endothelium normalizes metabolic activity and branching behaviour. Our findings identify FOXO1 as a critical rheostat of vascular expansion and define the FOXO1-MYC transcriptional network as a novel metabolic checkpoint during endothelial growth and proliferation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilhelm, Kerstin -- Happel, Katharina -- Eelen, Guy -- Schoors, Sandra -- Oellerich, Mark F -- Lim, Radiance -- Zimmermann, Barbara -- Aspalter, Irene M -- Franco, Claudio A -- Boettger, Thomas -- Braun, Thomas -- Fruttiger, Marcus -- Rajewsky, Klaus -- Keller, Charles -- Bruning, Jens C -- Gerhardt, Holger -- Carmeliet, Peter -- Potente, Michael -- K08CA090438/CA/NCI NIH HHS/ -- Cancer Research UK/United Kingdom -- England -- Nature. 2016 Jan 14;529(7585):216-20. doi: 10.1038/nature16498. Epub 2016 Jan 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Angiogenesis &Metabolism Laboratory, Max Planck Institute for Heart and Lung Research, D-61231 Bad Nauheim, Germany. ; Laboratory of Angiogenesis and Neurovascular Link, Vesalius Research Center, Department of Oncology, University of Leuven, Leuven 3000, Belgium. ; Laboratory of Angiogenesis and Neurovascular Link, Vesalius Research Center, VIB, Leuven 3000, Belgium. ; Vascular Biology Laboratory, London Research Institute, Cancer Research UK, London WC2A 3LY, UK. ; Vascular Morphogenesis Laboratory, Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, Lisbon 1649-028, Portugal. ; Department of Cardiac Development and Remodeling, Max Planck Institute for Heart and Lung Research, D-61231 Bad Nauheim, Germany. ; UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK. ; Max Delbruck Center for Molecular Medicine (MDC), D-13125 Berlin, Germany. ; Children's Cancer Therapy Development Institute, Beaverton, Oregon 97005, USA. ; Max Planck Institute for Metabolism Research, Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD) and Center of Molecular Medicine Cologne (CMMC), Center for Endocrinology, Diabetes and Preventive Medicine (CEDP), University of Cologne, D-50931 Cologne, Germany. ; Vascular Patterning Laboratory, Vesalius Research Center, VIB and University of Leuven, Leuven 3000, Belgium. ; DZHK (German Center for Cardiovascular Research), partner site Berlin, D-13347 Berlin, Germany. ; Berlin Institute of Health (BIH), D-10117 Berlin, Germany. ; International Institute of Molecular and Cell Biology, 02-109 Warsaw, Poland. ; DZHK (German Center for Cardiovascular Research), partner site Frankfurt Rhine-Main, D-13347 Berlin, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26735015" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Proliferation ; Cell Respiration ; Endothelium, Vascular/cytology/*growth & development/*metabolism ; Female ; Forkhead Transcription Factors/deficiency/genetics/*metabolism ; Glycolysis ; Human Umbilical Vein Endothelial Cells/cytology/metabolism ; Humans ; Male ; Mice ; Mice, Inbred C57BL ; Proto-Oncogene Proteins c-myc/deficiency/genetics/metabolism ; Signal Transduction
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  • 25
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    Nature Publishing Group (NPG)
    Publication Date: 2016-04-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Willyard, Cassandra -- England -- Nature. 2016 Apr 14;532(7598):166-8. doi: 10.1038/532166a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27075079" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antineoplastic Agents/economics/therapeutic use ; Antineoplastic Combined Chemotherapy Protocols/economics/*therapeutic use ; Clinical Trials as Topic ; DNA Mutational Analysis ; Dose-Response Relationship, Drug ; Drug Resistance, Neoplasm/*drug effects/genetics ; *Evolution, Molecular ; Female ; Humans ; Immunotherapy, Adoptive/economics/trends ; Mice ; Molecular Targeted Therapy/economics/*methods/trends ; Mutation/*genetics ; Neoplasm Metastasis/drug therapy/genetics/pathology ; Neoplasm Recurrence, Local/chemically induced/genetics/prevention & control ; Neoplasms/*drug therapy/*genetics/pathology ; Selection, Genetic/*drug effects/genetics ; Tumor Microenvironment/drug effects
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  • 26
    Publication Date: 2016-04-14
    Description: Bone marrow endothelial cells (BMECs) form a network of blood vessels that regulate both leukocyte trafficking and haematopoietic stem and progenitor cell (HSPC) maintenance. However, it is not clear how BMECs balance these dual roles, and whether these events occur at the same vascular site. We found that mammalian bone marrow stem cell maintenance and leukocyte trafficking are regulated by distinct blood vessel types with different permeability properties. Less permeable arterial blood vessels maintain haematopoietic stem cells in a low reactive oxygen species (ROS) state, whereas the more permeable sinusoids promote HSPC activation and are the exclusive site for immature and mature leukocyte trafficking to and from the bone marrow. A functional consequence of high permeability of blood vessels is that exposure to blood plasma increases bone marrow HSPC ROS levels, augmenting their migration and differentiation, while compromising their long-term repopulation and survival. These findings may have relevance for clinical haematopoietic stem cell transplantation and mobilization protocols.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Itkin, Tomer -- Gur-Cohen, Shiri -- Spencer, Joel A -- Schajnovitz, Amir -- Ramasamy, Saravana K -- Kusumbe, Anjali P -- Ledergor, Guy -- Jung, Yookyung -- Milo, Idan -- Poulos, Michael G -- Kalinkovich, Alexander -- Ludin, Aya -- Kollet, Orit -- Shakhar, Guy -- Butler, Jason M -- Rafii, Shahin -- Adams, Ralf H -- Scadden, David T -- Lin, Charles P -- Lapidot, Tsvee -- EB017274/EB/NIBIB NIH HHS/ -- HL100402/HL/NHLBI NIH HHS/ -- R01 EB017274/EB/NIBIB NIH HHS/ -- U01 HL100402/HL/NHLBI NIH HHS/ -- England -- Nature. 2016 Apr 21;532(7599):323-8. doi: 10.1038/nature17624. Epub 2016 Apr 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, The Weizmann Institute of Science, Rehovot 76100, Israel. ; Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA. ; Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA. ; Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, Massachusetts 02138, USA. ; Harvard Stem Cell Institute, Cambridge, Massachusetts 02114, USA. ; Center for Regenerative Medicine and Cancer Center, Massachusetts General Hospital, Boston, Massachusetts 02114, USA. ; Max Planck Institute for Molecular Biomedicine, Department of Tissue Morphogenesis and Faculty of Medicine, University of Munster, D-48149 Munster, Germany. ; Internal Medicine Department, Tel-Aviv Sourasky Medical Center, Tel-Aviv 64239, Israel. ; Department of Genetic Medicine, Weill Cornell Medical College, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27074509" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Ly/metabolism ; Arteries/cytology/physiology ; Blood Vessels/*cytology/*physiology ; Bone Marrow/*blood supply ; Bone Marrow Cells/cytology ; Cell Differentiation ; Cell Movement ; Cell Self Renewal ; Cell Survival ; Chemokine CXCL12/metabolism ; Endothelial Cells/physiology ; Female ; *Hematopoiesis ; Hematopoietic Stem Cell Mobilization ; Hematopoietic Stem Cell Transplantation ; Hematopoietic Stem Cells/cytology ; Leukocytes/cytology ; Male ; Membrane Proteins/metabolism ; Mice ; Mice, Inbred C57BL ; Nestin/metabolism ; Pericytes/physiology ; Permeability ; Plasma/metabolism ; Reactive Oxygen Species/metabolism ; Receptors, CXCR4/metabolism
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  • 27
    Publication Date: 2016-01-28
    Description: Adeno-associated virus (AAV) vectors are currently the leading candidates for virus-based gene therapies because of their broad tissue tropism, non-pathogenic nature and low immunogenicity. They have been successfully used in clinical trials to treat hereditary diseases such as haemophilia B (ref. 2), and have been approved for treatment of lipoprotein lipase deficiency in Europe. Considerable efforts have been made to engineer AAV variants with novel and biomedically valuable cell tropisms to allow efficacious systemic administration, yet basic aspects of AAV cellular entry are still poorly understood. In particular, the protein receptor(s) required for AAV entry after cell attachment remains unknown. Here we use an unbiased genetic screen to identify proteins essential for AAV serotype 2 (AAV2) infection in a haploid human cell line. The most significantly enriched gene of the screen encodes a previously uncharacterized type I transmembrane protein, KIAA0319L (denoted hereafter as AAV receptor (AAVR)). We characterize AAVR as a protein capable of rapid endocytosis from the plasma membrane and trafficking to the trans-Golgi network. We show that AAVR directly binds to AAV2 particles, and that anti-AAVR antibodies efficiently block AAV2 infection. Moreover, genetic ablation of AAVR renders a wide range of mammalian cell types highly resistant to AAV2 infection. Notably, AAVR serves as a critical host factor for all tested AAV serotypes. The importance of AAVR for in vivo gene delivery is further highlighted by the robust resistance of Aavr(-/-) (also known as Au040320(-/-) and Kiaa0319l(-/-)) mice to AAV infection. Collectively, our data indicate that AAVR is a universal receptor involved in AAV infection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pillay, S -- Meyer, N L -- Puschnik, A S -- Davulcu, O -- Diep, J -- Ishikawa, Y -- Jae, L T -- Wosen, J E -- Nagamine, C M -- Chapman, M S -- Carette, J E -- DP2 AI104557/AI/NIAID NIH HHS/ -- R01 GM066875/GM/NIGMS NIH HHS/ -- U19 AI109662/AI/NIAID NIH HHS/ -- England -- Nature. 2016 Feb 4;530(7588):108-12. doi: 10.1038/nature16465. Epub 2016 Jan 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, Stanford University School of Medicine, 299 Campus Drive, Stanford, California 94305, USA. ; Department of Biochemistry and Molecular Biology, School of Medicine, Oregon Health &Science University, 3181 Sam Jackson Park Road, Portland, Oregon 97239-3098, USA. ; Shriners Hospital for Children, 3101 Sam Jackson Park Road, Portland, Oregon 97239, USA. ; Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, Netherlands. ; Department of Comparative Medicine, Stanford University School of Medicine, 287 Campus Drive, Stanford, California 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26814968" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies/immunology/pharmacology ; Cell Line ; Dependovirus/classification/drug effects/*physiology ; Endocytosis/drug effects ; Female ; Gene Deletion ; Genetic Therapy/methods ; Host Specificity ; Humans ; Male ; Mice ; Parvoviridae Infections/*metabolism/*virology ; Receptors, Cell Surface/antagonists & inhibitors/deficiency/genetics/*metabolism ; Receptors, Virus/antagonists & inhibitors/deficiency/genetics/*metabolism ; *Viral Tropism/drug effects ; Virus Internalization/drug effects ; trans-Golgi Network/drug effects
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  • 28
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2016-03-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McGilvray, Annabel -- England -- Nature. 2016 Mar 3;531(7592):S4-5. doi: 10.1038/531S4a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26934524" target="_blank"〉PubMed〈/a〉
    Keywords: Acetates/pharmacology/therapeutic use ; Aging/blood/drug effects/pathology/*psychology ; Alzheimer Disease/blood/therapy ; Animals ; Anti-Asthmatic Agents/pharmacology/therapeutic use ; Cognition Disorders/pathology/physiopathology/*prevention & control/*therapy ; Estrogens/pharmacology ; Female ; Hippocampus/drug effects/pathology/physiology/physiopathology ; Humans ; Inflammation Mediators/immunology ; Leukotrienes/immunology ; Macaca mulatta ; Male ; Mice ; Neuronal Plasticity/drug effects ; Parkinson Disease/therapy ; Plasma/chemistry/physiology ; Prefrontal Cortex/drug effects/pathology/physiology/physiopathology ; Quinolines/pharmacology/therapeutic use ; Rats ; Rejuvenation/*physiology/*psychology ; Synapses/drug effects/metabolism/pathology
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  • 29
    Publication Date: 2016-04-21
    Description: Our current understanding of immunology was largely defined in laboratory mice, partly because they are inbred and genetically homogeneous, can be genetically manipulated, allow kinetic tissue analyses to be carried out from the onset of disease, and permit the use of tractable disease models. Comparably reductionist experiments are neither technically nor ethically possible in humans. However, there is growing concern that laboratory mice do not reflect relevant aspects of the human immune system, which may account for failures to translate disease treatments from bench to bedside. Laboratory mice live in abnormally hygienic specific pathogen free (SPF) barrier facilities. Here we show that standard laboratory mouse husbandry has profound effects on the immune system and that environmental changes produce mice with immune systems closer to those of adult humans. Laboratory mice--like newborn, but not adult, humans--lack effector-differentiated and mucosally distributed memory T cells. These cell populations were present in free-living barn populations of feral mice and pet store mice with diverse microbial experience, and were induced in laboratory mice after co-housing with pet store mice, suggesting that the environment is involved in the induction of these cells. Altering the living conditions of mice profoundly affected the cellular composition of the innate and adaptive immune systems, resulted in global changes in blood cell gene expression to patterns that more closely reflected the immune signatures of adult humans rather than neonates, altered resistance to infection, and influenced T-cell differentiation in response to a de novo viral infection. These data highlight the effects of environment on the basal immune state and response to infection and suggest that restoring physiological microbial exposure in laboratory mice could provide a relevant tool for modelling immunological events in free-living organisms, including humans.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4871315/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4871315/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beura, Lalit K -- Hamilton, Sara E -- Bi, Kevin -- Schenkel, Jason M -- Odumade, Oludare A -- Casey, Kerry A -- Thompson, Emily A -- Fraser, Kathryn A -- Rosato, Pamela C -- Filali-Mouhim, Ali -- Sekaly, Rafick P -- Jenkins, Marc K -- Vezys, Vaiva -- Haining, W Nicholas -- Jameson, Stephen C -- Masopust, David -- 1R01AI111671/AI/NIAID NIH HHS/ -- R01 AI075168/AI/NIAID NIH HHS/ -- R01 AI084913/AI/NIAID NIH HHS/ -- R01 AI111671/AI/NIAID NIH HHS/ -- R01 AI116678/AI/NIAID NIH HHS/ -- R01AI075168/AI/NIAID NIH HHS/ -- R01AI084913/AI/NIAID NIH HHS/ -- R01AI116678/AI/NIAID NIH HHS/ -- England -- Nature. 2016 Apr 28;532(7600):512-6. doi: 10.1038/nature17655. Epub 2016 Apr 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Immunology, Department of Microbiology and Immunology, University of Minnesota, Minneapolis, Minnesota 55414, USA. ; Center for Immunology, Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota 55414, USA. ; Department of Pediatric Oncology, Dana-Farber Cancer Institute, and Pediatric Hematology and Oncology, Children's Hospital, Boston, Massachusetts 02115, USA. ; Department of Pathology, Case Western Reserve University, Cleveland, Ohio 44106, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27096360" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Animal Husbandry/*methods ; Animals ; Animals, Laboratory/*immunology ; Animals, Wild/*immunology ; Cell Differentiation ; *Environment ; Environmental Exposure ; Female ; Humans ; Immune System/*immunology ; Immunity/*immunology ; Immunity, Innate/immunology ; Immunologic Memory ; Infant, Newborn ; Male ; Mice ; *Models, Animal ; Phenotype ; Specific Pathogen-Free Organisms ; T-Lymphocytes/cytology/immunology ; Virus Diseases/immunology/virology
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  • 30
    Publication Date: 2016-03-05
    Description: Little is known about how pro-obesity diets regulate tissue stem and progenitor cell function. Here we show that high-fat diet (HFD)-induced obesity augments the numbers and function of Lgr5(+) intestinal stem cells of the mammalian intestine. Mechanistically, a HFD induces a robust peroxisome proliferator-activated receptor delta (PPAR-delta) signature in intestinal stem cells and progenitor cells (non-intestinal stem cells), and pharmacological activation of PPAR-delta recapitulates the effects of a HFD on these cells. Like a HFD, ex vivo treatment of intestinal organoid cultures with fatty acid constituents of the HFD enhances the self-renewal potential of these organoid bodies in a PPAR-delta-dependent manner. Notably, HFD- and agonist-activated PPAR-delta signalling endow organoid-initiating capacity to progenitors, and enforced PPAR-delta signalling permits these progenitors to form in vivo tumours after loss of the tumour suppressor Apc. These findings highlight how diet-modulated PPAR-delta activation alters not only the function of intestinal stem and progenitor cells, but also their capacity to initiate tumours.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4846772/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4846772/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beyaz, Semir -- Mana, Miyeko D -- Roper, Jatin -- Kedrin, Dmitriy -- Saadatpour, Assieh -- Hong, Sue-Jean -- Bauer-Rowe, Khristian E -- Xifaras, Michael E -- Akkad, Adam -- Arias, Erika -- Pinello, Luca -- Katz, Yarden -- Shinagare, Shweta -- Abu-Remaileh, Monther -- Mihaylova, Maria M -- Lamming, Dudley W -- Dogum, Rizkullah -- Guo, Guoji -- Bell, George W -- Selig, Martin -- Nielsen, G Petur -- Gupta, Nitin -- Ferrone, Cristina R -- Deshpande, Vikram -- Yuan, Guo-Cheng -- Orkin, Stuart H -- Sabatini, David M -- Yilmaz, Omer H -- AI47389/AI/NIAID NIH HHS/ -- DK043351/DK/NIDDK NIH HHS/ -- K08 CA198002/CA/NCI NIH HHS/ -- K99 AG041765/AG/NIA NIH HHS/ -- K99 AG045144/AG/NIA NIH HHS/ -- P30 CA014051/CA/NCI NIH HHS/ -- P30-CA14051/CA/NCI NIH HHS/ -- R00 AG041765/AG/NIA NIH HHS/ -- R00 AG045144/AG/NIA NIH HHS/ -- R01 AI047389/AI/NIAID NIH HHS/ -- R01 CA103866/CA/NCI NIH HHS/ -- R01 CA129105/CA/NCI NIH HHS/ -- R37 AI047389/AI/NIAID NIH HHS/ -- T32DK007191/DK/NIDDK NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Mar 3;531(7592):53-8. doi: 10.1038/nature17173.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The David H. Koch Institute for Integrative Cancer Research at MIT, Department of Biology, MIT, Cambridge, Massachusetts 02139, USA. ; Division of Hematology/Oncology, Boston Children's Hospital and Department of Pediatric Oncology, Dana-Farber Cancer Institute, Howard Hughes Medical Institute, Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115, USA. ; Division of Gastroenterology and Molecular Oncology Research Institute, Tufts Medical Center, Boston, Massachusetts 02111, USA. ; Departments of Pathology, Gastroenterology, and Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA. ; Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute and Harvard T. H. Chan School of Public Health, Boston, Massachusetts 02115, USA. ; Whitehead Institute for Biomedical Research, Howard Hughes Medical Institute, Department of Biology, MIT, Cambridge, Massachusetts 02142, USA. ; Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, USA. ; Department of Medicine, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA. ; Division of Digestive Diseases, University of Mississippi Medical Center, Jackson, Missisippi 39216, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26935695" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Count ; Cell Self Renewal/drug effects ; Cell Transformation, Neoplastic/*drug effects ; Colonic Neoplasms/*pathology ; Diet, High-Fat/*adverse effects ; Female ; Genes, APC ; Humans ; Intestines/*pathology ; Male ; Mice ; Obesity/chemically induced/pathology ; Organoids/drug effects/metabolism/pathology ; PPAR delta/metabolism ; Signal Transduction/drug effects ; Stem Cell Niche/drug effects ; Stem Cells/*drug effects/metabolism/*pathology ; beta Catenin/metabolism
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  • 31
    Publication Date: 2016-05-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tollefson, Jeff -- England -- Nature. 2016 May 10;533(7602):156-7. doi: 10.1038/533156a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27172025" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biology/instrumentation/*methods ; Cesium Radioisotopes/*supply & distribution ; Immune System/immunology/radiation effects ; Immunologic Techniques/instrumentation/methods ; Internationality ; *Laboratories ; Mice ; *Research Design ; *Research Personnel ; *Security Measures/trends ; X-Rays
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  • 32
    Publication Date: 2016-03-17
    Description: The energetic burden of continuously concentrating solutes against gradients along the tubule may render the kidney especially vulnerable to ischaemia. Acute kidney injury (AKI) affects 3% of all hospitalized patients. Here we show that the mitochondrial biogenesis regulator, PGC1alpha, is a pivotal determinant of renal recovery from injury by regulating nicotinamide adenine dinucleotide (NAD) biosynthesis. Following renal ischaemia, Pgc1alpha(-/-) (also known as Ppargc1a(-/-)) mice develop local deficiency of the NAD precursor niacinamide (NAM, also known as nicotinamide), marked fat accumulation, and failure to re-establish normal function. Notably, exogenous NAM improves local NAD levels, fat accumulation, and renal function in post-ischaemic Pgc1alpha(-/-) mice. Inducible tubular transgenic mice (iNephPGC1alpha) recapitulate the effects of NAM supplementation, including more local NAD and less fat accumulation with better renal function after ischaemia. PGC1alpha coordinately upregulates the enzymes that synthesize NAD de novo from amino acids whereas PGC1alpha deficiency or AKI attenuates the de novo pathway. NAM enhances NAD via the enzyme NAMPT and augments production of the fat breakdown product beta-hydroxybutyrate, leading to increased production of prostaglandin PGE2 (ref. 5), a secreted autacoid that maintains renal function. NAM treatment reverses established ischaemic AKI and also prevented AKI in an unrelated toxic model. Inhibition of beta-hydroxybutyrate signalling or prostaglandin production similarly abolishes PGC1alpha-dependent renoprotection. Given the importance of mitochondrial health in ageing and the function of metabolically active organs, the results implicate NAM and NAD as key effectors for achieving PGC1alpha-dependent stress resistance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tran, Mei T -- Zsengeller, Zsuzsanna K -- Berg, Anders H -- Khankin, Eliyahu V -- Bhasin, Manoj K -- Kim, Wondong -- Clish, Clary B -- Stillman, Isaac E -- Karumanchi, S Ananth -- Rhee, Eugene P -- Parikh, Samir M -- K08-DK090142/DK/NIDDK NIH HHS/ -- K08-DK101560/DK/NIDDK NIH HHS/ -- P30-DK079337/DK/NIDDK NIH HHS/ -- R01 DK095072/DK/NIDDK NIH HHS/ -- R01-DK095072/DK/NIDDK NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Mar 24;531(7595):528-32. doi: 10.1038/nature17184. Epub 2016 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Nephrology and Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA. ; Center for Vascular Biology Research, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA. ; Division of Clinical Chemistry, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA. ; Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA. ; Bioinformatics and Systems Biology Core, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA. ; Nephrology and Endocrine Divisions, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA. ; Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02139, USA. ; Howard Hughes Medical Institute, Chevy Chase, Maryland 20815, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26982719" target="_blank"〉PubMed〈/a〉
    Keywords: 3-Hydroxybutyric Acid/metabolism ; Acute Kidney Injury/drug therapy/*metabolism ; Adipose Tissue/drug effects/metabolism ; Amino Acids/metabolism ; Animals ; Cytokines/metabolism ; Dinoprostone/biosynthesis/metabolism ; Humans ; Ischemia/drug therapy/metabolism ; Kidney/drug effects/*metabolism/physiology/physiopathology ; Male ; Mice ; Mice, Inbred C57BL ; Mitochondria/metabolism ; NAD/*biosynthesis ; Niacinamide/deficiency/pharmacology/therapeutic use ; Nicotinamide Phosphoribosyltransferase/metabolism ; Oxidation-Reduction ; Signal Transduction/drug effects ; Stress, Physiological ; Transcription Factors/deficiency/*metabolism
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  • 33
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2016-03-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉King, Anthony -- England -- Nature. 2016 Mar 3;531(7592):S18-9. doi: 10.1038/531S18a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26934522" target="_blank"〉PubMed〈/a〉
    Keywords: Amygdala/metabolism ; Animals ; Brain/*physiology ; Bullying ; DNA Methylation ; Depression/complications/prevention & control/therapy ; Emotional Adjustment ; Epigenesis, Genetic/genetics ; Female ; Hippocampus/metabolism ; Humans ; Hydrocortisone/metabolism ; Maternal Behavior ; Memory/physiology ; Mice ; Models, Animal ; Oxytocin/metabolism ; Pregnancy ; Prenatal Exposure Delayed Effects/genetics ; Psychological Trauma/complications/genetics/metabolism ; Rats ; *Resilience, Psychological ; Social Isolation/psychology ; Stress, Psychological/complications/genetics/metabolism/therapy
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  • 34
    Publication Date: 2016-04-12
    Description: Asymmetric cell division, the partitioning of cellular components in response to polarizing cues during mitosis, has roles in differentiation and development. It is important for the self-renewal of fertilized zygotes in Caenorhabditis elegans and neuroblasts in Drosophila, and in the development of mammalian nervous and digestive systems. T lymphocytes, upon activation by antigen-presenting cells (APCs), can undergo asymmetric cell division, wherein the daughter cell proximal to the APC is more likely to differentiate into an effector-like T cell and the distal daughter is more likely to differentiate into a memory-like T cell. Upon activation and before cell division, expression of the transcription factor c-Myc drives metabolic reprogramming, necessary for the subsequent proliferative burst. Here we find that during the first division of an activated T cell in mice, c-Myc can sort asymmetrically. Asymmetric distribution of amino acid transporters, amino acid content, and activity of mammalian target of rapamycin complex 1 (mTORC1) is correlated with c-Myc expression, and both amino acids and mTORC1 activity sustain the differences in c-Myc expression in one daughter cell compared to the other. Asymmetric c-Myc levels in daughter T cells affect proliferation, metabolism, and differentiation, and these effects are altered by experimental manipulation of mTORC1 activity or c-Myc expression. Therefore, metabolic signalling pathways cooperate with transcription programs to maintain differential cell fates following asymmetric T-cell division.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4851250/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4851250/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Verbist, Katherine C -- Guy, Cliff S -- Milasta, Sandra -- Liedmann, Swantje -- Kaminski, Marcin M -- Wang, Ruoning -- Green, Douglas R -- R01 GM096208/GM/NIGMS NIH HHS/ -- R37 GM052735/GM/NIGMS NIH HHS/ -- England -- Nature. 2016 Apr 21;532(7599):389-93. doi: 10.1038/nature17442. Epub 2016 Apr 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105, USA. ; Center for Childhood Cancer and Blood Disease, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27064903" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Transport Systems/metabolism ; Amino Acids/metabolism ; Animals ; CD8-Positive T-Lymphocytes/*cytology/*metabolism ; Cell Differentiation/genetics ; *Cell Division ; *Cell Polarity/genetics ; Female ; *Lymphocyte Activation ; Male ; Mice ; Multiprotein Complexes/metabolism ; Proto-Oncogene Proteins c-myc/genetics/metabolism ; Signal Transduction/genetics ; TOR Serine-Threonine Kinases/metabolism ; Transcription, Genetic
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  • 35
    Publication Date: 2016-01-14
    Description: The myelin sheaths wrapped around axons by oligodendrocytes are crucial for brain function. In ischaemia myelin is damaged in a Ca(2+)-dependent manner, abolishing action potential propagation. This has been attributed to glutamate release activating Ca(2+)-permeable N-methyl-D-aspartate (NMDA) receptors. Surprisingly, we now show that NMDA does not raise the intracellular Ca(2+) concentration ([Ca(2+)]i) in mature oligodendrocytes and that, although ischaemia evokes a glutamate-triggered membrane current, this is generated by a rise of extracellular [K(+)] and decrease of membrane K(+) conductance. Nevertheless, ischaemia raises oligodendrocyte [Ca(2+)]i, [Mg(2+)]i and [H(+)]i, and buffering intracellular pH reduces the [Ca(2+)]i and [Mg(2+)]i increases, showing that these are evoked by the rise of [H(+)]i. The H(+)-gated [Ca(2+)]i elevation is mediated by channels with characteristics of TRPA1, being inhibited by ruthenium red, isopentenyl pyrophosphate, HC-030031, A967079 or TRPA1 knockout. TRPA1 block reduces myelin damage in ischaemia. These data suggest that TRPA1-containing ion channels could be a therapeutic target in white matter ischaemia.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4733665/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4733665/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hamilton, Nicola B -- Kolodziejczyk, Karolina -- Kougioumtzidou, Eleni -- Attwell, David -- Wellcome Trust/United Kingdom -- England -- Nature. 2016 Jan 28;529(7587):523-7. doi: 10.1038/nature16519. Epub 2016 Jan 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, Physiology &Pharmacology, University College London, Gower St., London WC1E 6BT, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26760212" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain Ischemia/*metabolism/*pathology ; Calcium/*metabolism ; Calcium Signaling/drug effects ; Electric Conductivity ; Female ; Hydrogen-Ion Concentration ; Magnesium/metabolism ; Male ; Mice ; Mice, Transgenic ; Multiple Sclerosis/metabolism/pathology ; Myelin Sheath/drug effects/*metabolism/*pathology ; N-Methylaspartate/metabolism/pharmacology ; Oligodendroglia/drug effects/metabolism/pathology ; Potassium/metabolism ; *Protons ; Rats ; Rats, Sprague-Dawley ; Receptors, N-Methyl-D-Aspartate/metabolism ; Stroke/metabolism/pathology ; Transient Receptor Potential Channels/antagonists & ; inhibitors/deficiency/genetics/*metabolism ; White Matter/metabolism/pathology
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  • 36
    Publication Date: 2016-03-24
    Description: Instinctive reactions to danger are critical to the perpetuation of species and are observed throughout the animal kingdom. The scent of predators induces an instinctive fear response in mice that includes behavioural changes, as well as a surge in blood stress hormones that mobilizes multiple body systems to escape impending danger. How the olfactory system routes predator signals detected in the nose to achieve these effects is unknown. Here we identify a specific area of the olfactory cortex in mice that induces stress hormone responses to volatile predator odours. Using monosynaptic and polysynaptic viral tracers, we found that multiple olfactory cortical areas transmit signals to hypothalamic corticotropin-releasing hormone (CRH) neurons, which control stress hormone levels. However, only one minor cortical area, the amygdalo-piriform transition area (AmPir), contained neurons upstream of CRH neurons that were activated by volatile predator odours. Chemogenetic stimulation of AmPir activated CRH neurons and induced an increase in blood stress hormones, mimicking an instinctive fear response. Moreover, chemogenetic silencing of AmPir markedly reduced the stress hormone response to predator odours without affecting a fear behaviour. These findings suggest that AmPir, a small area comprising 〈5% of the olfactory cortex, plays a key part in the hormonal component of the instinctive fear response to volatile predator scents.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kondoh, Kunio -- Lu, Zhonghua -- Ye, Xiaolan -- Olson, David P -- Lowell, Bradford B -- Buck, Linda B -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Apr 7;532(7597):103-6. doi: 10.1038/nature17156. Epub 2016 Mar 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Basic Sciences Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, Washington 98109, USA. ; Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27001694" target="_blank"〉PubMed〈/a〉
    Keywords: Adrenocorticotropic Hormone/blood ; Animals ; Corticosterone/blood ; Corticotropin-Releasing Hormone/blood/metabolism ; Escape Reaction ; Fear ; Female ; Hippocampus/cytology/physiology ; Hormones/blood/*metabolism ; Instinct ; Male ; Mice ; Neurons/metabolism ; Odors/*analysis ; Olfactory Cortex/*anatomy & histology/cytology/*physiology ; *Olfactory Pathways ; Olfactory Perception/physiology ; *Predatory Behavior ; Smell/*physiology ; *Stress, Psychological ; Telencephalon/anatomy & histology/cytology/physiology
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  • 37
    Publication Date: 2016-04-29
    Description: Umbilical cord blood-derived haematopoietic stem cells (HSCs) are essential for many life-saving regenerative therapies. However, despite their advantages for transplantation, their clinical use is restricted because HSCs in cord blood are found only in small numbers. Small molecules that enhance haematopoietic stem and progenitor cell (HSPC) expansion in culture have been identified, but in many cases their mechanisms of action or the nature of the pathways they impinge on are poorly understood. A greater understanding of the molecular circuitry that underpins the self-renewal of human HSCs will facilitate the development of targeted strategies that expand HSCs for regenerative therapies. Whereas transcription factor networks have been shown to influence the self-renewal and lineage decisions of human HSCs, the post-transcriptional mechanisms that guide HSC fate have not been closely investigated. Here we show that overexpression of the RNA-binding protein Musashi-2 (MSI2) induces multiple pro-self-renewal phenotypes, including a 17-fold increase in short-term repopulating cells and a net 23-fold ex vivo expansion of long-term repopulating HSCs. By performing a global analysis of MSI2-RNA interactions, we show that MSI2 directly attenuates aryl hydrocarbon receptor (AHR) signalling through post-transcriptional downregulation of canonical AHR pathway components in cord blood HSPCs. Our study gives mechanistic insight into RNA networks controlled by RNA-binding proteins that underlie self-renewal and provides evidence that manipulating such networks ex vivo can enhance the regenerative potential of human HSCs.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4880456/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4880456/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rentas, Stefan -- Holzapfel, Nicholas T -- Belew, Muluken S -- Pratt, Gabriel A -- Voisin, Veronique -- Wilhelm, Brian T -- Bader, Gary D -- Yeo, Gene W -- Hope, Kristin J -- HG004659/HG/NHGRI NIH HHS/ -- MOP-126030/Canadian Institutes of Health Research/Canada -- NS075449/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Apr 28;532(7600):508-11. doi: 10.1038/nature17665.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Biomedical Sciences, Stem Cell and Cancer Research Institute, McMaster University, Hamilton, Ontario L8S 4K1, Canada. ; Department of Cellular and Molecular Medicine, Institute for Genomic Medicine, University of California, San Diego, La Jolla, California 92037, USA. ; Bioinformatics Graduate Program, University of California, San Diego, La Jolla, California 92037, USA. ; The Donnelly Centre, University of Toronto, Toronto, Ontario M5S 3E1, Canada. ; Institute for Research in Immunology and Cancer, University of Montreal, Montreal, Quebec H3C 3J7, Canada. ; Department of Physiology, National University of Singapore and Molecular Engineering Laboratory, A*STAR, Singapore 138632, Singapore.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27121842" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Basic Helix-Loop-Helix Transcription Factors/genetics/*metabolism ; Cell Count ; *Cell Self Renewal/genetics ; Down-Regulation/genetics ; Female ; Fetal Blood/cytology ; Gene Knockdown Techniques ; Hematopoietic Stem Cells/*cytology/*metabolism ; Humans ; Male ; Mice ; Protein Binding ; RNA, Messenger/genetics/metabolism ; RNA-Binding Proteins/genetics/*metabolism ; Receptors, Aryl Hydrocarbon/genetics/*metabolism ; *Signal Transduction/genetics
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  • 38
    Publication Date: 2016-02-09
    Description: The tremendous pandemic potential of coronaviruses was demonstrated twice in the past few decades by two global outbreaks of deadly pneumonia. Entry of coronaviruses into cells is mediated by the transmembrane spike glycoprotein S, which forms a trimer carrying receptor-binding and membrane fusion functions. S also contains the principal antigenic determinants and is the target of neutralizing antibodies. Here we present the structure of a mouse coronavirus S trimer ectodomain determined at 4.0 A resolution by single particle cryo-electron microscopy. It reveals the metastable pre-fusion architecture of S and highlights key interactions stabilizing it. The structure shares a common core with paramyxovirus F proteins, implicating mechanistic similarities and an evolutionary connection between these viral fusion proteins. The accessibility of the highly conserved fusion peptide at the periphery of the trimer indicates potential vaccinology strategies to elicit broadly neutralizing antibodies against coronaviruses. Finally, comparison with crystal structures of human coronavirus S domains allows rationalization of the molecular basis for species specificity based on the use of spatially contiguous but distinct domains.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Walls, Alexandra C -- Tortorici, M Alejandra -- Bosch, Berend-Jan -- Frenz, Brandon -- Rottier, Peter J M -- DiMaio, Frank -- Rey, Felix A -- Veesler, David -- GM103310/GM/NIGMS NIH HHS/ -- T32GM008268/GM/NIGMS NIH HHS/ -- England -- Nature. 2016 Mar 3;531(7592):114-7. doi: 10.1038/nature16988. Epub 2016 Feb 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Washington, Seattle, Washington 98195, USA. ; Institut Pasteur, Unite de Virologie Structurale, 75015 Paris, France. ; CNRS UMR 3569 Virologie, 75015 Paris, France. ; Virology Division, Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, 3584 CL Utrecht, The Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26855426" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Neutralizing/immunology ; Cell Line ; Coronavirus Infections/immunology/virology ; *Cryoelectron Microscopy ; Drosophila melanogaster ; Mice ; Models, Molecular ; Molecular Sequence Data ; Murine hepatitis virus/*chemistry/immunology/*ultrastructure ; Protein Multimerization ; Protein Structure, Tertiary ; Spike Glycoprotein, Coronavirus/*chemistry/immunology/*ultrastructure ; Viral Vaccines/chemistry/immunology ; Virus Internalization
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  • 39
    Publication Date: 2016-01-28
    Description: ATP-dependent chromatin remodellers allow access to DNA for transcription factors and the general transcription machinery, but whether mammalian chromatin remodellers target specific nucleosomes to regulate transcription is unclear. Here we present genome-wide remodeller-nucleosome interaction profiles for the chromatin remodellers Chd1, Chd2, Chd4, Chd6, Chd8, Chd9, Brg1 and Ep400 in mouse embryonic stem (ES) cells. These remodellers bind one or both full nucleosomes that flank micrococcal nuclease (MNase)-defined nucleosome-free promoter regions (NFRs), where they separate divergent transcription. Surprisingly, large CpG-rich NFRs that extend downstream of annotated transcriptional start sites are nevertheless bound by non-nucleosomal or subnucleosomal histone variants (H3.3 and H2A.Z) and marked by H3K4me3 and H3K27ac modifications. RNA polymerase II therefore navigates hundreds of base pairs of altered chromatin in the sense direction before encountering an MNase-resistant nucleosome at the 3' end of the NFR. Transcriptome analysis after remodeller depletion reveals reciprocal mechanisms of transcriptional regulation by remodellers. Whereas at active genes individual remodellers have either positive or negative roles via altering nucleosome stability, at polycomb-enriched bivalent genes the same remodellers act in an opposite manner. These findings indicate that remodellers target specific nucleosomes at the edge of NFRs, where they regulate ES cell transcriptional programs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉de Dieuleveult, Maud -- Yen, Kuangyu -- Hmitou, Isabelle -- Depaux, Arnaud -- Boussouar, Faycal -- Dargham, Daria Bou -- Jounier, Sylvie -- Humbertclaude, Helene -- Ribierre, Florence -- Baulard, Celine -- Farrell, Nina P -- Park, Bongsoo -- Keime, Celine -- Carriere, Lucie -- Berlivet, Soizick -- Gut, Marta -- Gut, Ivo -- Werner, Michel -- Deleuze, Jean-Francois -- Olaso, Robert -- Aude, Jean-Christophe -- Chantalat, Sophie -- Pugh, B Franklin -- Gerard, Matthieu -- HG004160/HG/NHGRI NIH HHS/ -- R01 HG004160/HG/NHGRI NIH HHS/ -- England -- Nature. 2016 Feb 4;530(7588):113-6. doi: 10.1038/nature16505. Epub 2016 Jan 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Integrative Biology of the Cell (I2BC), IBITECS, CEA, CNRS, Universite Paris-Sud, Universite Paris-Saclay, 91198 Gif-sur-Yvette, France. ; Key Laboratory of Zebrafish Modeling and Drug Screening for Human Diseases of Guangdong Higher Education Institutes, Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, China. ; Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA. ; INSERM, U823; Universite Grenoble Alpes; Institut Albert Bonniot Grenoble, 38700 Grenoble, France. ; Centre National de Genotypage, Institut de Genomique, CEA, 91057 Evry, France. ; IGBMC (Institut de Genetique et de Biologie Moleculaire et Cellulaire), INSERM, U964, CNRS, UMR7104, Universite de Strasbourg, 67404 Illkirch, France. ; Centre Nacional D'Analisi Genomica, 08028 Barcelona, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26814966" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Chromatin Assembly and Disassembly ; DNA Helicases/metabolism ; DNA-Binding Proteins/*metabolism ; *Gene Expression Regulation ; Genome/*genetics ; Histones/metabolism ; Mice ; Micrococcal Nuclease/metabolism ; Mouse Embryonic Stem Cells/cytology/*metabolism ; Nuclear Proteins/metabolism ; Nucleosomes/*genetics/*metabolism ; Promoter Regions, Genetic/genetics ; RNA Polymerase II/metabolism ; Substrate Specificity ; Trans-Activators/metabolism ; Transcription Factors/metabolism ; Transcription Initiation Site
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  • 40
    Publication Date: 2016-03-17
    Description: Alzheimer's disease (AD) is a neurodegenerative disorder characterized by progressive memory decline and subsequent loss of broader cognitive functions. Memory decline in the early stages of AD is mostly limited to episodic memory, for which the hippocampus has a crucial role. However, it has been uncertain whether the observed amnesia in the early stages of AD is due to disrupted encoding and consolidation of episodic information, or an impairment in the retrieval of stored memory information. Here we show that in transgenic mouse models of early AD, direct optogenetic activation of hippocampal memory engram cells results in memory retrieval despite the fact that these mice are amnesic in long-term memory tests when natural recall cues are used, revealing a retrieval, rather than a storage impairment. Before amyloid plaque deposition, the amnesia in these mice is age-dependent, which correlates with a progressive reduction in spine density of hippocampal dentate gyrus engram cells. We show that optogenetic induction of long-term potentiation at perforant path synapses of dentate gyrus engram cells restores both spine density and long-term memory. We also demonstrate that an ablation of dentate gyrus engram cells containing restored spine density prevents the rescue of long-term memory. Thus, selective rescue of spine density in engram cells may lead to an effective strategy for treating memory loss in the early stages of AD.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4847731/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4847731/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roy, Dheeraj S -- Arons, Autumn -- Mitchell, Teryn I -- Pignatelli, Michele -- Ryan, Tomas J -- Tonegawa, Susumu -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Mar 24;531(7595):508-12. doi: 10.1038/nature17172. Epub 2016 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉RIKEN-MIT Center for Neural Circuit Genetics at the Picower Institute for Learning and Memory, Department of Biology and Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. ; Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26982728" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Alzheimer Disease/*pathology/*physiopathology ; Amnesia/pathology/physiopathology ; Amyloid beta-Protein Precursor/genetics ; Animals ; Dendritic Spines/pathology/physiology ; Dentate Gyrus/*cytology/pathology/*physiology/physiopathology ; *Disease Models, Animal ; Early Medical Intervention ; Humans ; Long-Term Potentiation ; Male ; Memory, Episodic ; Memory, Long-Term/*physiology ; Mice ; Mice, Transgenic ; Optogenetics ; Plaque, Amyloid ; Presenilin-1/genetics ; Synapses/metabolism ; Transgenes/genetics ; tau Proteins/genetics
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  • 41
    Publication Date: 2016-03-18
    Description: Chronic hepatitis B virus infection is a leading cause of cirrhosis and liver cancer. Hepatitis B virus encodes the regulatory HBx protein whose primary role is to promote transcription of the viral genome, which persists as an extrachromosomal DNA circle in infected cells. HBx accomplishes this task by an unusual mechanism, enhancing transcription only from extrachromosomal DNA templates. Here we show that HBx achieves this by hijacking the cellular DDB1-containing E3 ubiquitin ligase to target the 'structural maintenance of chromosomes' (Smc) complex Smc5/6 for degradation. Blocking this event inhibits the stimulatory effect of HBx both on extrachromosomal reporter genes and on hepatitis B virus transcription. Conversely, silencing the Smc5/6 complex enhances extrachromosomal reporter gene transcription in the absence of HBx, restores replication of an HBx-deficient hepatitis B virus, and rescues wild-type hepatitis B virus in a DDB1-knockdown background. The Smc5/6 complex associates with extrachromosomal reporters and the hepatitis B virus genome, suggesting a direct mechanism of transcriptional inhibition. These results uncover a novel role for the Smc5/6 complex as a restriction factor selectively blocking extrachromosomal DNA transcription. By destroying this complex, HBx relieves the inhibition to allow productive hepatitis B virus gene expression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Decorsiere, Adrien -- Mueller, Henrik -- van Breugel, Pieter C -- Abdul, Fabien -- Gerossier, Laetitia -- Beran, Rudolf K -- Livingston, Christine M -- Niu, Congrong -- Fletcher, Simon P -- Hantz, Olivier -- Strubin, Michel -- England -- Nature. 2016 Mar 17;531(7594):386-9. doi: 10.1038/nature17170.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Molecular Medicine, University Medical Centre (C.M.U.), Rue Michel-Servet 1, 1211 Geneva 4, Switzerland. ; CRCL, INSERM U1052, CNRS 5286, Universite de Lyon, 151, Cours A Thomas, 69424 Lyon Cedex, France. ; Gilead Sciences, Inc., 333 Lakeside Drive, Foster City, California 94404, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26983541" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Cycle Proteins/*metabolism ; Cell Line, Tumor ; DNA, Viral/genetics/metabolism ; Genes, Reporter ; Genome, Viral/genetics ; Hepatitis B/virology ; Hepatitis B virus/genetics/*physiology ; Hepatocytes/virology ; *Host Specificity ; Humans ; Liver/metabolism/virology ; Male ; Mice ; Plasmids/genetics/metabolism ; Protein Binding ; Proteolysis ; Trans-Activators/*metabolism ; Transcription, Genetic ; Ubiquitin/metabolism ; Ubiquitin-Protein Ligases/metabolism ; Virus Replication
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  • 42
    Publication Date: 2016-03-31
    Description: Colonic epithelial cells are covered by thick inner and outer mucus layers. The inner mucus layer is free of commensal microbiota, which contributes to the maintenance of gut homeostasis. In the small intestine, molecules critical for prevention of bacterial invasion into epithelia such as Paneth-cell-derived anti-microbial peptides and regenerating islet-derived 3 (RegIII) family proteins have been identified. Although there are mucus layers providing physical barriers against the large number of microbiota present in the large intestine, the mechanisms that separate bacteria and colonic epithelia are not fully elucidated. Here we show that Ly6/PLAUR domain containing 8 (Lypd8) protein prevents flagellated microbiota invading the colonic epithelia in mice. Lypd8, selectively expressed in epithelial cells at the uppermost layer of the large intestinal gland, was secreted into the lumen and bound flagellated bacteria including Proteus mirabilis. In the absence of Lypd8, bacteria were present in the inner mucus layer and many flagellated bacteria invaded epithelia. Lypd8(-/-) mice were highly sensitive to intestinal inflammation induced by dextran sulfate sodium (DSS). Antibiotic elimination of Gram-negative flagellated bacteria restored the bacterial-free state of the inner mucus layer and ameliorated DSS-induced intestinal inflammation in Lypd8(-/-) mice. Lypd8 bound to flagella and suppressed motility of flagellated bacteria. Thus, Lypd8 mediates segregation of intestinal bacteria and epithelial cells in the colon to preserve intestinal homeostasis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Okumura, Ryu -- Kurakawa, Takashi -- Nakano, Takashi -- Kayama, Hisako -- Kinoshita, Makoto -- Motooka, Daisuke -- Gotoh, Kazuyoshi -- Kimura, Taishi -- Kamiyama, Naganori -- Kusu, Takashi -- Ueda, Yoshiyasu -- Wu, Hong -- Iijima, Hideki -- Barman, Soumik -- Osawa, Hideki -- Matsuno, Hiroshi -- Nishimura, Junichi -- Ohba, Yusuke -- Nakamura, Shota -- Iida, Tetsuya -- Yamamoto, Masahiro -- Umemoto, Eiji -- Sano, Koichi -- Takeda, Kiyoshi -- England -- Nature. 2016 Apr 7;532(7597):117-21. doi: 10.1038/nature17406. Epub 2016 Mar 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Immune Regulation, Department of Microbiology and Immunology, Graduate School of Medicine, WPI Immunology Frontier Research Center, Osaka University, Suita, Osaka 565-0871, Japan. ; Core Research for Evolutional Science and Technology, Japan Agency for Medical Research and Development, Tokyo 100-0004, Japan. ; Department of Microbiology and Infection Control, Osaka Medical College, Takatsuki, Osaka 569-8686, Japan. ; Department of Infection Metagenomics, Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan. ; Department of Bacteriology, Okayama University Graduate School of Medicine, Okayama 700-8558, Japan. ; Department of Gastroenterology and Hepatology, Graduate School of Medicine, Osaka University, Osaka 565-0871, Japan. ; Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka 565-0871, Japan. ; Department of Cell Physiology, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan. ; Department of Bacterial Infections, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan. ; Laboratory of Immunoparasitology, Research Institute for Microbial Diseases, WPI Immunology Frontier Research Center, Osaka University, Suita, Osaka 565-0871, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27027293" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Adhesion ; Caco-2 Cells ; Cell Line ; Colitis/chemically induced/drug therapy/genetics ; Colon/*microbiology ; Dextran Sulfate ; Epithelium/*microbiology ; Female ; *Flagella ; GPI-Linked Proteins/deficiency/genetics/*metabolism/secretion ; Gram-Negative Bacteria/drug effects/metabolism/pathogenicity/*physiology ; Homeostasis ; Humans ; Inflammation/chemically induced/drug therapy/genetics ; Intestinal Mucosa/cytology/metabolism/*microbiology/secretion ; Male ; Mice ; Proteus mirabilis/drug effects/metabolism/pathogenicity ; Symbiosis
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  • 43
    Publication Date: 2016-03-29
    Description: Circuits in the cerebral cortex consist of thousands of neurons connected by millions of synapses. A precise understanding of these local networks requires relating circuit activity with the underlying network structure. For pyramidal cells in superficial mouse visual cortex (V1), a consensus is emerging that neurons with similar visual response properties excite each other, but the anatomical basis of this recurrent synaptic network is unknown. Here we combined physiological imaging and large-scale electron microscopy to study an excitatory network in V1. We found that layer 2/3 neurons organized into subnetworks defined by anatomical connectivity, with more connections within than between groups. More specifically, we found that pyramidal neurons with similar orientation selectivity preferentially formed synapses with each other, despite the fact that axons and dendrites of all orientation selectivities pass near (〈5 mum) each other with roughly equal probability. Therefore, we predict that mechanisms of functionally specific connectivity take place at the length scale of spines. Neurons with similar orientation tuning formed larger synapses, potentially enhancing the net effect of synaptic specificity. With the ability to study thousands of connections in a single circuit, functional connectomics is proving a powerful method to uncover the organizational logic of cortical networks.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4844839/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4844839/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Wei-Chung Allen -- Bonin, Vincent -- Reed, Michael -- Graham, Brett J -- Hood, Greg -- Glattfelder, Katie -- Reid, R Clay -- P30 EY012196/EY/NEI NIH HHS/ -- P30 EY12196/EY/NEI NIH HHS/ -- P41 GM103712/GM/NIGMS NIH HHS/ -- P41 RR006009/RR/NCRR NIH HHS/ -- P41 RR06009/RR/NCRR NIH HHS/ -- R01 EY010115/EY/NEI NIH HHS/ -- R01 EY10115/EY/NEI NIH HHS/ -- R01 NS075436/NS/NINDS NIH HHS/ -- R21 NS085320/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Apr 21;532(7599):370-4. doi: 10.1038/nature17192. Epub 2016 Mar 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA. ; Neuro-Electronics Research Flanders, a research initiative by imec, Vlaams Instituut voor Biotechnologie (VIB) and Katholieke Universiteit (KU) Leuven, 3001 Leuven, Belgium. ; Biomedical Applications Group, Pittsburgh Supercomputing Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA. ; Allen Institute for Brain Science, Seattle, Washington 98103, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27018655" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/physiology ; Calcium/analysis ; Dendrites/physiology ; Male ; Mice ; Mice, Inbred C57BL ; Photons ; Pyramidal Cells/cytology/physiology ; Synapses/metabolism ; Visual Cortex/*anatomy & histology/cytology/*physiology/ultrastructure ; Visual Pathways/anatomy & histology/*cytology/*physiology/ultrastructure
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  • 44
    Publication Date: 2016-01-07
    Description: Mechanisms that maintain cancer stem cells are crucial to tumour progression. The ID2 protein supports cancer hallmarks including the cancer stem cell state. HIFalpha transcription factors, most notably HIF2alpha (also known as EPAS1), are expressed in and required for maintenance of cancer stem cells (CSCs). However, the pathways that are engaged by ID2 or drive HIF2alpha accumulation in CSCs have remained unclear. Here we report that DYRK1A and DYRK1B kinases phosphorylate ID2 on threonine 27 (Thr27). Hypoxia downregulates this phosphorylation via inactivation of DYRK1A and DYRK1B. The activity of these kinases is stimulated in normoxia by the oxygen-sensing prolyl hydroxylase PHD1 (also known as EGLN2). ID2 binds to the VHL ubiquitin ligase complex, displaces VHL-associated Cullin 2, and impairs HIF2alpha ubiquitylation and degradation. Phosphorylation of Thr27 of ID2 by DYRK1 blocks ID2-VHL interaction and preserves HIF2alpha ubiquitylation. In glioblastoma, ID2 positively modulates HIF2alpha activity. Conversely, elevated expression of DYRK1 phosphorylates Thr27 of ID2, leading to HIF2alpha destabilization, loss of glioma stemness, inhibition of tumour growth, and a more favourable outcome for patients with glioblastoma.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Sang Bae -- Frattini, Veronique -- Bansal, Mukesh -- Castano, Angelica M -- Sherman, Dan -- Hutchinson, Keino -- Bruce, Jeffrey N -- Califano, Andrea -- Liu, Guangchao -- Cardozo, Timothy -- Iavarone, Antonio -- Lasorella, Anna -- R01CA101644/CA/NCI NIH HHS/ -- R01CA131126/CA/NCI NIH HHS/ -- R01CA178546/CA/NCI NIH HHS/ -- R01NS061776/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Jan 14;529(7585):172-7. doi: 10.1038/nature16475. Epub 2016 Jan 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Cancer Genetics, Columbia University Medical Center, New York 10032, USA. ; Department of Systems Biology, Columbia University Medical Center, New York 10032, USA. ; Center for Computational Biology and Bioinformatics, Columbia University Medical Center, New York 10032, USA. ; Department of Biochemistry and Molecular Pharmacology, NYU School of Medicine, New York 10014, USA. ; Department of Neurosurgery, Columbia University Medical Center, New York 10032, USA. ; Department of Neurology, Columbia University Medical Center, New York 10032, USA. ; Department of Pathology, Columbia University Medical Center, New York 10032, USA. ; Department of Pediatrics, Columbia University Medical Center, New York 10032, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26735018" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Basic Helix-Loop-Helix Transcription Factors/metabolism ; Cell Hypoxia ; Cell Line, Tumor ; Cullin Proteins/metabolism ; Glioblastoma/*metabolism/*pathology ; Humans ; Hypoxia-Inducible Factor-Proline Dioxygenases/metabolism ; Inhibitor of Differentiation Protein 2/*metabolism ; Male ; Mice ; Neoplastic Stem Cells/*metabolism/pathology ; Oxygen/metabolism ; Phosphorylation ; Phosphothreonine/metabolism ; Protein Binding ; Protein-Serine-Threonine Kinases/antagonists & inhibitors/metabolism ; Protein-Tyrosine Kinases/antagonists & inhibitors/metabolism ; Ubiquitination ; Von Hippel-Lindau Tumor Suppressor Protein/*antagonists & inhibitors/metabolism ; Xenograft Model Antitumor Assays
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  • 45
    Publication Date: 2016-03-25
    Description: Focal amplifications of chromosome 3p13-3p14 occur in about 10% of melanomas and are associated with a poor prognosis. The melanoma-specific oncogene MITF resides at the epicentre of this amplicon. However, whether other loci present in this amplicon also contribute to melanomagenesis is unknown. Here we show that the recently annotated long non-coding RNA (lncRNA) gene SAMMSON is consistently co-gained with MITF. In addition, SAMMSON is a target of the lineage-specific transcription factor SOX10 and its expression is detectable in more than 90% of human melanomas. Whereas exogenous SAMMSON increases the clonogenic potential in trans, SAMMSON knockdown drastically decreases the viability of melanoma cells irrespective of their transcriptional cell state and BRAF, NRAS or TP53 mutational status. Moreover, SAMMSON targeting sensitizes melanoma to MAPK-targeting therapeutics both in vitro and in patient-derived xenograft models. Mechanistically, SAMMSON interacts with p32, a master regulator of mitochondrial homeostasis and metabolism, to increase its mitochondrial targeting and pro-oncogenic function. Our results indicate that silencing of the lineage addiction oncogene SAMMSON disrupts vital mitochondrial functions in a cancer-cell-specific manner; this silencing is therefore expected to deliver highly effective and tissue-restricted anti-melanoma therapeutic responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Leucci, Eleonora -- Vendramin, Roberto -- Spinazzi, Marco -- Laurette, Patrick -- Fiers, Mark -- Wouters, Jasper -- Radaelli, Enrico -- Eyckerman, Sven -- Leonelli, Carina -- Vanderheyden, Katrien -- Rogiers, Aljosja -- Hermans, Els -- Baatsen, Pieter -- Aerts, Stein -- Amant, Frederic -- Van Aelst, Stefan -- van den Oord, Joost -- de Strooper, Bart -- Davidson, Irwin -- Lafontaine, Denis L J -- Gevaert, Kris -- Vandesompele, Jo -- Mestdagh, Pieter -- Marine, Jean-Christophe -- England -- Nature. 2016 Mar 24;531(7595):518-22. doi: 10.1038/nature17161.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory For Molecular Cancer Biology, Center for Human Genetics, KULeuven, Herestraat 49, 3000 Leuven, Belgium. ; Center for the Biology of Disease, VIB, Herestraat 49, 3000 Leuven, Belgium. ; Institut de Genetique et de Biologie Moleculaire et Cellulaire (IGBMC), Rue Laurent Fries 1, 67404 Illkirch, France. ; Laboratory of Translational Cell and Tissue Research, Department of Pathology, KULeuven and UZ Leuven, Herestraat 49, 3000 Leuven, Belgium. ; Mouse Histopathology Core Facility, Center for the Biology of Disease, VIB-KULeuven, Herestraat 49, 3000 Leuven, Belgium. ; Medical Biotechnology Center, VIB, Albert Baertsoenkaai 3, 9000 Gent, Belgium. ; Department of Biochemistry, Gent University, Albert Baertsoenkaai 3, 9000 Gent, Belgium. ; Center for Medical Genetics, Gent University, De Pintelaan 185, 9000 Gent, Belgium. ; Cancer Research Institute Gent, Gent University, De Pintelaan 185, 9000 Gent, Belgium. ; Gynaecologische Oncologie, KU Leuven, Herestraat 49, 3000 Leuven, Belgium. ; Laboratory of Computational Biology, Center for Human Genetics, KULeuven, Herestraat 49, 3000 Leuven, Belgium. ; Department of Applied Mathematics, Computer Science and Statistics, Gent University, De Pintelaan 185, 9000 Gent, Belgium. ; Department of Mathematics, KU Leuven, Celestijnenlann 200B, 3001 Leuven, Belgium. ; RNA Molecular Biology, Center for Microscopy and Molecular Imaging, Universite Libre de Bruxelles (ULB), rue des Professeurs Jeener et Brachet 12, 6041 Charleroi, Belgium.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27008969" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Carcinogenesis/genetics/pathology ; Cell Lineage ; Cell Proliferation ; Cell Survival ; Chromosomes, Human, Pair 3/genetics ; Clone Cells/metabolism/pathology ; Female ; Gene Amplification/genetics ; Gene Knockdown Techniques ; Humans ; Melanoma/*genetics/*pathology/therapy ; Mice ; Microphthalmia-Associated Transcription Factor/genetics ; Mitochondria/genetics/metabolism/pathology ; Mitochondrial Proteins/metabolism ; Mitogen-Activated Protein Kinases/antagonists & inhibitors/metabolism ; Molecular Targeted Therapy ; Oncogenes/*genetics ; RNA, Long Noncoding/*genetics/therapeutic use ; SOXE Transcription Factors/metabolism ; Xenograft Model Antitumor Assays
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  • 46
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    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2016-03-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eisenstein, Michael -- England -- Nature. 2016 Mar 17;531(7594):401-3. doi: 10.1038/531401a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26983542" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biosensing Techniques/methods ; Biotechnology/economics/standards/*trends ; CRISPR-Cas Systems/genetics ; *Cell Survival ; Cell-Free System ; DNA/analysis/chemical synthesis/genetics ; Escherichia coli/genetics/metabolism ; Gout/diagnosis/prevention & control ; Humans ; Hydrocodone/metabolism ; Mice ; Obesity/diagnosis/prevention & control ; Promoter Regions, Genetic/genetics ; Synthetic Biology/economics/standards/*trends ; Yeasts/genetics/metabolism
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 47
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2016-05-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Scott, Andrew R -- England -- Nature. 2016 May 11;533(7602):S60-1. doi: 10.1038/533S60a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27167393" target="_blank"〉PubMed〈/a〉
    Keywords: *Access to Information ; Animals ; *Azepines/classification/economics/pharmacology/therapeutic use ; Clinical Trials as Topic ; Drug Discovery/economics/*methods ; Histones/metabolism ; Humans ; *Information Dissemination ; Male ; Mice ; Neoplasms/drug therapy ; Patents as Topic/statistics & numerical data ; Protein Binding ; Protein Structure, Tertiary ; *Triazoles/classification/economics/pharmacology/therapeutic use ; Xenograft Model Antitumor Assays
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 48
    Publication Date: 2016-04-07
    Description: Neoplastic pancreatic epithelial cells are believed to die through caspase 8-dependent apoptotic cell death, and chemotherapy is thought to promote tumour apoptosis. Conversely, cancer cells often disrupt apoptosis to survive. Another type of programmed cell death is necroptosis (programmed necrosis), but its role in pancreatic ductal adenocarcinoma (PDA) is unclear. There are many potential inducers of necroptosis in PDA, including ligation of tumour necrosis factor receptor 1 (TNFR1), CD95, TNF-related apoptosis-inducing ligand (TRAIL) receptors, Toll-like receptors, reactive oxygen species, and chemotherapeutic drugs. Here we report that the principal components of the necrosome, receptor-interacting protein (RIP)1 and RIP3, are highly expressed in PDA and are further upregulated by the chemotherapy drug gemcitabine. Blockade of the necrosome in vitro promoted cancer cell proliferation and induced an aggressive oncogenic phenotype. By contrast, in vivo deletion of RIP3 or inhibition of RIP1 protected against oncogenic progression in mice and was associated with the development of a highly immunogenic myeloid and T cell infiltrate. The immune-suppressive tumour microenvironment associated with intact RIP1/RIP3 signalling depended in part on necroptosis-induced expression of the chemokine attractant CXCL1, and CXCL1 blockade protected against PDA. Moreover, cytoplasmic SAP130 (a subunit of the histone deacetylase complex) was expressed in PDA in a RIP1/RIP3-dependent manner, and Mincle--its cognate receptor--was upregulated in tumour-infiltrating myeloid cells. Ligation of Mincle by SAP130 promoted oncogenesis, whereas deletion of Mincle protected against oncogenesis and phenocopied the immunogenic reprogramming of the tumour microenvironment that was induced by RIP3 deletion. Cellular depletion suggested that whereas inhibitory macrophages promote tumorigenesis in PDA, they lose their immune-suppressive effects when RIP3 or Mincle is deleted. Accordingly, T cells, which are not protective against PDA progression in mice with intact RIP3 or Mincle signalling, are reprogrammed into indispensable mediators of anti-tumour immunity in the absence of RIP3 or Mincle. Our work describes parallel networks of necroptosis-induced CXCL1 and Mincle signalling that promote macrophage-induced adaptive immune suppression and thereby enable PDA progression.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4833566/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4833566/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Seifert, Lena -- Werba, Gregor -- Tiwari, Shaun -- Giao Ly, Nancy Ngoc -- Alothman, Sara -- Alqunaibit, Dalia -- Avanzi, Antonina -- Barilla, Rocky -- Daley, Donnele -- Greco, Stephanie H -- Torres-Hernandez, Alejandro -- Pergamo, Matthew -- Ochi, Atsuo -- Zambirinis, Constantinos P -- Pansari, Mridul -- Rendon, Mauricio -- Tippens, Daniel -- Hundeyin, Mautin -- Mani, Vishnu R -- Hajdu, Cristina -- Engle, Dannielle -- Miller, George -- CA155649/CA/NCI NIH HHS/ -- CA168611/CA/NCI NIH HHS/ -- CA193111/CA/NCI NIH HHS/ -- P30CA016087/CA/NCI NIH HHS/ -- R01 CA168611/CA/NCI NIH HHS/ -- T32 CA193111/CA/NCI NIH HHS/ -- UL1 TR000038/TR/NCATS NIH HHS/ -- England -- Nature. 2016 Apr 14;532(7598):245-9. doi: 10.1038/nature17403. Epub 2016 Apr 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, New York 10016, USA. ; Department of Cell Biology, New York University School of Medicine, 550 First Avenue, New York, New York 10016, USA. ; Department of Pathology, New York University School of Medicine, 550 First Avenue, New York, New York 10016, USA. ; Cold Spring Harbor Laboratories, Cold Spring Harbor, New York 11724, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27049944" target="_blank"〉PubMed〈/a〉
    Keywords: Adenocarcinoma/immunology/metabolism/pathology ; Animals ; Apoptosis/drug effects ; *Carcinogenesis/drug effects ; Carcinoma, Pancreatic Ductal/immunology/metabolism/pathology ; Cell Line, Tumor ; Cell Proliferation/drug effects ; Chemokine CXCL1/antagonists & inhibitors/*metabolism ; Deoxycytidine/analogs & derivatives/pharmacology ; Disease Progression ; Female ; GTPase-Activating Proteins/metabolism ; Gene Expression Regulation, Neoplastic ; Humans ; *Immune Tolerance ; Lectins, C-Type/immunology/*metabolism ; Male ; Membrane Proteins/immunology/*metabolism ; Mice ; Mice, Inbred C57BL ; *Necrosis ; Pancreatic Neoplasms/*immunology/metabolism/*pathology ; Receptor-Interacting Protein Serine-Threonine Kinases/metabolism ; Signal Transduction ; Up-Regulation
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  • 49
    Publication Date: 2016-01-28
    Description: Schizophrenia is a heritable brain illness with unknown pathogenic mechanisms. Schizophrenia's strongest genetic association at a population level involves variation in the major histocompatibility complex (MHC) locus, but the genes and molecular mechanisms accounting for this have been challenging to identify. Here we show that this association arises in part from many structurally diverse alleles of the complement component 4 (C4) genes. We found that these alleles generated widely varying levels of C4A and C4B expression in the brain, with each common C4 allele associating with schizophrenia in proportion to its tendency to generate greater expression of C4A. Human C4 protein localized to neuronal synapses, dendrites, axons, and cell bodies. In mice, C4 mediated synapse elimination during postnatal development. These results implicate excessive complement activity in the development of schizophrenia and may help explain the reduced numbers of synapses in the brains of individuals with schizophrenia.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4752392/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4752392/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sekar, Aswin -- Bialas, Allison R -- de Rivera, Heather -- Davis, Avery -- Hammond, Timothy R -- Kamitaki, Nolan -- Tooley, Katherine -- Presumey, Jessy -- Baum, Matthew -- Van Doren, Vanessa -- Genovese, Giulio -- Rose, Samuel A -- Handsaker, Robert E -- Schizophrenia Working Group of the Psychiatric Genomics Consortium -- Daly, Mark J -- Carroll, Michael C -- Stevens, Beth -- McCarroll, Steven A -- R01 HG006855/HG/NHGRI NIH HHS/ -- R01 MH077139/MH/NIMH NIH HHS/ -- T32 GM007753/GM/NIGMS NIH HHS/ -- U01 MH105641/MH/NIMH NIH HHS/ -- England -- Nature. 2016 Feb 11;530(7589):177-83. doi: 10.1038/nature16549. Epub 2016 Jan 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA. ; Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, USA. ; MD-PhD Program, Harvard Medical School, Boston, Massachusetts 02115, USA. ; Department of Neurology, F.M. Kirby Neurobiology Center, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA. ; Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, Massachusetts 02115, USA. ; Analytical and Translational Genetics Unit, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26814963" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Animals ; Axons/metabolism ; Base Sequence ; Brain/metabolism/pathology ; Complement C4/chemistry/*genetics ; Complement Pathway, Classical ; Dendrites/metabolism ; Gene Dosage/genetics ; Gene Expression Regulation/genetics ; Genetic Predisposition to Disease/*genetics ; Genetic Variation/*genetics ; Haplotypes/genetics ; Humans ; Major Histocompatibility Complex/genetics ; Mice ; Models, Animal ; Neuronal Plasticity/genetics/physiology ; Polymorphism, Single Nucleotide/genetics ; RNA, Messenger/analysis/genetics ; Risk Factors ; Schizophrenia/*genetics/pathology ; Synapses/metabolism
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  • 50
    Publication Date: 2016-02-13
    Description: The proteasome is a multi-component protease complex responsible for regulating key processes such as the cell cycle and antigen presentation. Compounds that target the proteasome are potentially valuable tools for the treatment of pathogens that depend on proteasome function for survival and replication. In particular, proteasome inhibitors have been shown to be toxic for the malaria parasite Plasmodium falciparum at all stages of its life cycle. Most compounds that have been tested against the parasite also inhibit the mammalian proteasome, resulting in toxicity that precludes their use as therapeutic agents. Therefore, better definition of the substrate specificity and structural properties of the Plasmodium proteasome could enable the development of compounds with sufficient selectivity to allow their use as anti-malarial agents. To accomplish this goal, here we use a substrate profiling method to uncover differences in the specificities of the human and P. falciparum proteasome. We design inhibitors based on amino-acid preferences specific to the parasite proteasome, and find that they preferentially inhibit the beta2-subunit. We determine the structure of the P. falciparum 20S proteasome bound to the inhibitor using cryo-electron microscopy and single-particle analysis, to a resolution of 3.6 A. These data reveal the unusually open P. falciparum beta2 active site and provide valuable information about active-site architecture that can be used to further refine inhibitor design. Furthermore, consistent with the recent finding that the proteasome is important for stress pathways associated with resistance of artemisinin family anti-malarials, we observe growth inhibition synergism with low doses of this beta2-selective inhibitor in artemisinin-sensitive and -resistant parasites. Finally, we demonstrate that a parasite-selective inhibitor could be used to attenuate parasite growth in vivo without appreciable toxicity to the host. Thus, the Plasmodium proteasome is a chemically tractable target that could be exploited by next-generation anti-malarial agents.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4755332/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4755332/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Hao -- O'Donoghue, Anthony J -- van der Linden, Wouter A -- Xie, Stanley C -- Yoo, Euna -- Foe, Ian T -- Tilley, Leann -- Craik, Charles S -- da Fonseca, Paula C A -- Bogyo, Matthew -- MC-UP-1201/5/Medical Research Council/United Kingdom -- R01 AI078947/AI/NIAID NIH HHS/ -- R01 AI105106/AI/NIAID NIH HHS/ -- R01AI078947/AI/NIAID NIH HHS/ -- R01EB05011/EB/NIBIB NIH HHS/ -- England -- Nature. 2016 Feb 11;530(7589):233-6. doi: 10.1038/nature16936.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, California 94305, USA. ; Department of Pathology, Stanford University School of Medicine, Stanford, California 94305, USA. ; Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, California 94158, USA. ; Department of Biochemistry and Molecular Biology, Bio21 Institute, University of Melbourne, Melbourne 3010, Victoria, Australia. ; MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26863983" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antimalarials/adverse effects/*chemistry/*pharmacology/toxicity ; Artemisinins/pharmacology ; Catalytic Domain ; Cryoelectron Microscopy ; Dose-Response Relationship, Drug ; *Drug Design ; Drug Resistance ; Drug Synergism ; Enzyme Activation ; Female ; Humans ; Mice ; Mice, Inbred BALB C ; Models, Molecular ; Plasmodium/*drug effects/*enzymology/growth & development ; Plasmodium chabaudi/drug effects/enzymology/physiology ; Plasmodium falciparum/drug effects/enzymology/growth & development ; Proteasome Endopeptidase Complex/chemistry/metabolism/ultrastructure ; Proteasome Inhibitors/adverse effects/*chemistry/*pharmacology/toxicity ; Protein Subunits/antagonists & inhibitors/chemistry/metabolism ; Species Specificity ; Substrate Specificity/drug effects
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  • 51
    Publication Date: 2016-05-07
    Description: T follicular helper (Tfh) cells are a subset of T cells carrying the CD4 antigen; they are important in supporting plasma cell and germinal centre responses. The initial induction of Tfh cell properties occurs within the first few days after activation by antigen recognition on dendritic cells, although how dendritic cells promote this cell-fate decision is not fully understood. Moreover, although Tfh cells are uniquely defined by expression of the follicle-homing receptor CXCR5 (refs 1, 2), the guidance receptor promoting the earlier localization of activated T cells at the interface of the B-cell follicle and T zone has been unclear. Here we show that the G-protein-coupled receptor EBI2 (GPR183) and its ligand 7alpha,25-dihydroxycholesterol mediate positioning of activated CD4 T cells at the interface of the follicle and T zone. In this location they interact with activated dendritic cells and are exposed to Tfh-cell-promoting inducible co-stimulator (ICOS) ligand. Interleukin-2 (IL-2) is a cytokine that has multiple influences on T-cell fate, including negative regulation of Tfh cell differentiation. We demonstrate that activated dendritic cells in the outer T zone further augment Tfh cell differentiation by producing membrane and soluble forms of CD25, the IL-2 receptor alpha-chain, and quenching T-cell-derived IL-2. Mice lacking EBI2 in T cells or CD25 in dendritic cells have reduced Tfh cells and mount defective T-cell-dependent plasma cell and germinal centre responses. These findings demonstrate that distinct niches within the lymphoid organ T zone support distinct cell fate decisions, and they establish a function for dendritic-cell-derived CD25 in controlling IL-2 availability and T-cell differentiation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Jianhua -- Lu, Erick -- Yi, Tangsheng -- Cyster, Jason G -- AI40098/AI/NIAID NIH HHS/ -- R01 AI040098/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 May 5;533(7601):110-4. doi: 10.1038/nature17947.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, California 94143, USA. ; Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, California 94143, USA. ; Key Laboratory of Medical Molecular Virology, Department of Medical Microbiology, School of Basic Medical Sciences, Shanghai Medical College, Fudan University, Shanghai, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27147029" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Differentiation ; Cell Membrane/metabolism ; Dendritic Cells/cytology/*immunology ; Female ; Germinal Center/immunology ; Hydroxycholesterols/metabolism ; Inducible T-Cell Co-Stimulator Protein/metabolism ; Interleukin-2/*immunology ; Interleukin-2 Receptor alpha Subunit/biosynthesis/chemistry/deficiency/metabolism ; Lymphocyte Activation ; Male ; Mice ; Plasma Cells/immunology ; Receptors, G-Protein-Coupled/deficiency/genetics/*metabolism ; Solubility ; T-Lymphocytes, Helper-Inducer/*cytology/*immunology
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  • 52
    Publication Date: 2016-02-09
    Description: Sighs are long, deep breaths expressing sadness, relief or exhaustion. Sighs also occur spontaneously every few minutes to reinflate alveoli, and sighing increases under hypoxia, stress, and certain psychiatric conditions. Here we use molecular, genetic, and pharmacologic approaches to identify a peptidergic sigh control circuit in murine brain. Small neural subpopulations in a key breathing control centre, the retrotrapezoid nucleus/parafacial respiratory group (RTN/pFRG), express bombesin-like neuropeptide genes neuromedin B (Nmb) or gastrin-releasing peptide (Grp). These project to the preBotzinger Complex (preBotC), the respiratory rhythm generator, which expresses NMB and GRP receptors in overlapping subsets of ~200 neurons. Introducing either neuropeptide into preBotC or onto preBotC slices, induced sighing or in vitro sigh activity, whereas elimination or inhibition of either receptor reduced basal sighing, and inhibition of both abolished it. Ablating receptor-expressing neurons eliminated basal and hypoxia-induced sighing, but left breathing otherwise intact initially. We propose that these overlapping peptidergic pathways comprise the core of a sigh control circuit that integrates physiological and perhaps emotional input to transform normal breaths into sighs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Peng -- Janczewski, Wiktor A -- Yackle, Kevin -- Kam, Kaiwen -- Pagliardini, Silvia -- Krasnow, Mark A -- Feldman, Jack L -- HL40959/HL/NHLBI NIH HHS/ -- HL70029/HL/NHLBI NIH HHS/ -- NS72211/NS/NINDS NIH HHS/ -- R01 HL040959/HL/NHLBI NIH HHS/ -- R01 HL070029/HL/NHLBI NIH HHS/ -- R01 NS072211/NS/NINDS NIH HHS/ -- Canadian Institutes of Health Research/Canada -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Feb 18;530(7590):293-7. doi: 10.1038/nature16964. Epub 2016 Feb 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305, USA. ; Systems Neurobiology Laboratory, Department of Neurobiology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California 90095, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26855425" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bombesin/pharmacology ; Emotions/physiology ; Female ; Gastrin-Releasing Peptide/deficiency/genetics/*metabolism ; In Vitro Techniques ; Male ; Mice ; Mice, Inbred C57BL ; Neurokinin B/*analogs & derivatives/deficiency/genetics/metabolism/pharmacology ; Neurons/drug effects/*physiology ; Rats ; Rats, Sprague-Dawley ; Receptors, Bombesin/*metabolism ; *Respiration/drug effects ; Respiratory Center/cytology/drug effects/physiology ; Ribosome Inactivating Proteins, Type 1/pharmacology ; Signal Transduction/drug effects/*physiology
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  • 53
    Publication Date: 2016-04-14
    Description: Neural activity maintains representations that bridge past and future events, often over many seconds. Network models can produce persistent and ramping activity, but the positive feedback that is critical for these slow dynamics can cause sensitivity to perturbations. Here we use electrophysiology and optogenetic perturbations in the mouse premotor cortex to probe the robustness of persistent neural representations during motor planning. We show that preparatory activity is remarkably robust to large-scale unilateral silencing: detailed neural dynamics that drive specific future movements were quickly and selectively restored by the network. Selectivity did not recover after bilateral silencing of the premotor cortex. Perturbations to one hemisphere are thus corrected by information from the other hemisphere. Corpus callosum bisections demonstrated that premotor cortex hemispheres can maintain preparatory activity independently. Redundancy across selectively coupled modules, as we observed in the premotor cortex, is a hallmark of robust control systems. Network models incorporating these principles show robustness that is consistent with data.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Nuo -- Daie, Kayvon -- Svoboda, Karel -- Druckmann, Shaul -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Apr 28;532(7600):459-64. doi: 10.1038/nature17643. Epub 2016 Apr 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia 20147, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27074502" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Brain Mapping ; Corpus Callosum/physiology ; Executive Function/*physiology ; Female ; Light ; Male ; Memory, Short-Term/physiology ; Mice ; Models, Neurological ; Motor Cortex/*cytology/*physiology/radiation effects ; Movement/*physiology/radiation effects ; Neurons/*physiology/radiation effects ; Optogenetics
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  • 54
    Publication Date: 2016-02-11
    Description: The enteric nervous system (ENS) is the largest component of the autonomic nervous system, with neuron numbers surpassing those present in the spinal cord. The ENS has been called the 'second brain' given its autonomy, remarkable neurotransmitter diversity and complex cytoarchitecture. Defects in ENS development are responsible for many human disorders including Hirschsprung disease (HSCR). HSCR is caused by the developmental failure of ENS progenitors to migrate into the gastrointestinal tract, particularly the distal colon. Human ENS development remains poorly understood owing to the lack of an easily accessible model system. Here we demonstrate the efficient derivation and isolation of ENS progenitors from human pluripotent stem (PS) cells, and their further differentiation into functional enteric neurons. ENS precursors derived in vitro are capable of targeted migration in the developing chick embryo and extensive colonization of the adult mouse colon. The in vivo engraftment and migration of human PS-cell-derived ENS precursors rescue disease-related mortality in HSCR mice (Ednrb(s-l/s-l)), although the mechanism of action remains unclear. Finally, EDNRB-null mutant ENS precursors enable modelling of HSCR-related migration defects, and the identification of pepstatin A as a candidate therapeutic target. Our study establishes the first, to our knowledge, human PS-cell-based platform for the study of human ENS development, and presents cell- and drug-based strategies for the treatment of HSCR.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4846424/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4846424/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fattahi, Faranak -- Steinbeck, Julius A -- Kriks, Sonja -- Tchieu, Jason -- Zimmer, Bastian -- Kishinevsky, Sarah -- Zeltner, Nadja -- Mica, Yvonne -- El-Nachef, Wael -- Zhao, Huiyong -- de Stanchina, Elisa -- Gershon, Michael D -- Grikscheit, Tracy C -- Chen, Shuibing -- Studer, Lorenz -- DP2 DK098093-01/DK/NIDDK NIH HHS/ -- NS15547/NS/NINDS NIH HHS/ -- P30 CA008748/CA/NCI NIH HHS/ -- R01 NS015547/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Mar 3;531(7592):105-9. doi: 10.1038/nature16951. Epub 2016 Feb 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Center for Stem Cell Biology, New York, New York 10065, USA. ; Developmental Biology Program, Sloan-Kettering Institute for Cancer Research, New York, New York 10065, USA. ; Weill Graduate School of Medical Sciences of Cornell University, New York, New York 10065, USA. ; Molecular Pharmacology Program, New York, New York 10065, USA. ; Department of Pathology and Cell Biology, Columbia University, College of Physicians and Surgeons, New York, New York 10032, USA. ; Children's Hospital Los Angeles, Pediatric Surgery, Los Angeles, California 90027, USA. ; Department of Surgery, Weill Medical College of Cornell University, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26863197" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Animals ; Cell Differentiation ; Cell Line ; *Cell Lineage ; Cell Movement ; Cell Separation ; *Cell- and Tissue-Based Therapy/methods ; Chick Embryo ; Colon/drug effects/pathology ; Disease Models, Animal ; Drug Discovery/*methods ; Enteric Nervous System/*pathology ; Female ; Gastrointestinal Tract/drug effects/pathology ; Hirschsprung Disease/*drug therapy/*pathology/therapy ; Humans ; Male ; Mice ; Neurons/drug effects/*pathology ; Pepstatins/metabolism ; Pluripotent Stem Cells/pathology ; Receptor, Endothelin B/metabolism ; Signal Transduction
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  • 55
    Publication Date: 2016-02-11
    Description: Mammalian Wnt proteins are believed to act as short-range signals, yet have not been previously visualized in vivo. Self-renewal, proliferation and differentiation are coordinated along a putative Wnt gradient in the intestinal crypt. Wnt3 is produced specifically by Paneth cells. Here we have generated an epitope-tagged, functional Wnt3 knock-in allele. Wnt3 covers basolateral membranes of neighbouring stem cells. In intestinal organoids, Wnt3-transfer involves direct contact between Paneth cells and stem cells. Plasma membrane localization requires surface expression of Frizzled receptors, which in turn is regulated by the transmembrane E3 ligases Rnf43/Znrf3 and their antagonists Lgr4-5/R-spondin. By manipulating Wnt3 secretion and by arresting stem-cell proliferation, we demonstrate that Wnt3 mainly travels away from its source in a cell-bound manner through cell division, and not through diffusion. We conclude that stem-cell membranes constitute a reservoir for Wnt proteins, while Frizzled receptor turnover and 'plasma membrane dilution' through cell division shape the epithelial Wnt3 gradient.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Farin, Henner F -- Jordens, Ingrid -- Mosa, Mohammed H -- Basak, Onur -- Korving, Jeroen -- Tauriello, Daniele V F -- de Punder, Karin -- Angers, Stephane -- Peters, Peter J -- Maurice, Madelon M -- Clevers, Hans -- England -- Nature. 2016 Feb 18;530(7590):340-3. doi: 10.1038/nature16937. Epub 2016 Feb 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences (KNAW) and University Medical Center Utrecht, 3584CT Utrecht, the Netherlands. ; German Cancer Consortium (DKTK), 69120 Heidelberg, Germany. ; Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, 60596 Frankfurt am Main, Germany. ; German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany. ; Department of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, 3584CX Utrecht, the Netherlands. ; The Maastricht Multimodal Molecular Imaging institute, Maastricht University, 6229ER Maastricht, the Netherlands. ; Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario M5S 3M2, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26863187" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Cell Adhesion ; Cell Division ; Cell Membrane/*metabolism ; Diffusion ; Female ; Frizzled Receptors/metabolism ; Gene Knock-In Techniques ; Intercellular Signaling Peptides and Proteins/metabolism ; Intestinal Mucosa/*cytology ; Male ; Mice ; Organoids/cytology/metabolism ; Paneth Cells/cytology/metabolism ; Receptors, G-Protein-Coupled/metabolism ; *Stem Cell Niche ; Stem Cells/*cytology/*metabolism ; Ubiquitin-Protein Ligases/metabolism ; *Wnt Signaling Pathway ; Wnt3 Protein/genetics/*metabolism/secretion
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  • 56
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    Nature Publishing Group (NPG)
    Publication Date: 2016-03-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lim, XiaoZhi -- England -- Nature. 2016 Mar 3;531(7592):26-8. doi: 10.1038/531026a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26935679" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Color ; *Fluorescence ; Humans ; Mice ; Nanomedicine/methods/trends ; Nanotechnology/methods/*trends ; Neoplasms/metabolism/pathology/surgery/therapy ; Quantum Dots/*analysis/chemistry ; Staining and Labeling/methods/trends ; Television/instrumentation
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  • 57
    Publication Date: 2016-04-14
    Description: Circadian clocks are fundamental to the biology of most eukaryotes, coordinating behaviour and physiology to resonate with the environmental cycle of day and night through complex networks of clock-controlled genes. A fundamental knowledge gap exists, however, between circadian gene expression cycles and the biochemical mechanisms that ultimately facilitate circadian regulation of cell biology. Here we report circadian rhythms in the intracellular concentration of magnesium ions, [Mg(2+)]i, which act as a cell-autonomous timekeeping component to determine key clock properties both in a human cell line and in a unicellular alga that diverged from each other more than 1 billion years ago. Given the essential role of Mg(2+) as a cofactor for ATP, a functional consequence of [Mg(2+)]i oscillations is dynamic regulation of cellular energy expenditure over the daily cycle. Mechanistically, we find that these rhythms provide bilateral feedback linking rhythmic metabolism to clock-controlled gene expression. The global regulation of nucleotide triphosphate turnover by intracellular Mg(2+) availability has potential to impact upon many of the cell's more than 600 MgATP-dependent enzymes and every cellular system where MgNTP hydrolysis becomes rate limiting. Indeed, we find that circadian control of translation by mTOR is regulated through [Mg(2+)]i oscillations. It will now be important to identify which additional biological processes are subject to this form of regulation in tissues of multicellular organisms such as plants and humans, in the context of health and disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feeney, Kevin A -- Hansen, Louise L -- Putker, Marrit -- Olivares-Yanez, Consuelo -- Day, Jason -- Eades, Lorna J -- Larrondo, Luis F -- Hoyle, Nathaniel P -- O'Neill, John S -- van Ooijen, Gerben -- 093734/Z/10/Z/Wellcome Trust/United Kingdom -- MC_UP_1201/4/Medical Research Council/United Kingdom -- England -- Nature. 2016 Apr 21;532(7599):375-9. doi: 10.1038/nature17407. Epub 2016 Apr 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MRC Laboratory for Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK. ; School of Biological Sciences, University of Edinburgh, Max Born Crescent, Edinburgh EH9 3BF, UK. ; Millennium Nucleus for Fungal Integrative and Synthetic Biology, Departamento de Genetica Molecular y Microbiologia, Facultad de Ciencias Biologicas, Pontificia Universidad Catolica de Chile, Casilla 114-D, Santiago, Chile. ; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK. ; School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh EH9 3FJ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27074515" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Animals ; Cell Line ; Chlorophyta/cytology/metabolism ; Circadian Clocks/genetics/*physiology ; Circadian Rhythm/genetics/*physiology ; *Energy Metabolism ; Feedback, Physiological ; Gene Expression Regulation ; Humans ; Intracellular Space/metabolism ; Magnesium/*metabolism ; Male ; Mice ; TOR Serine-Threonine Kinases/metabolism ; Time Factors
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  • 58
    Publication Date: 2016-04-07
    Description: Microglia are damage sensors for the central nervous system (CNS), and the phagocytes responsible for routine non-inflammatory clearance of dead brain cells. Here we show that the TAM receptor tyrosine kinases Mer and Axl regulate these microglial functions. We find that adult mice deficient in microglial Mer and Axl exhibit a marked accumulation of apoptotic cells specifically in neurogenic regions of the CNS, and that microglial phagocytosis of the apoptotic cells generated during adult neurogenesis is normally driven by both TAM receptor ligands Gas6 and protein S. Using live two-photon imaging, we demonstrate that the microglial response to brain damage is also TAM-regulated, as TAM-deficient microglia display reduced process motility and delayed convergence to sites of injury. Finally, we show that microglial expression of Axl is prominently upregulated in the inflammatory environment that develops in a mouse model of Parkinson's disease. Together, these results establish TAM receptors as both controllers of microglial physiology and potential targets for therapeutic intervention in CNS disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fourgeaud, Lawrence -- Traves, Paqui G -- Tufail, Yusuf -- Leal-Bailey, Humberto -- Lew, Erin D -- Burrola, Patrick G -- Callaway, Perri -- Zagorska, Anna -- Rothlin, Carla V -- Nimmerjahn, Axel -- Lemke, Greg -- DP2 NS083038/DP/NCCDPHP CDC HHS/ -- DP2 NS083038/NS/NINDS NIH HHS/ -- P30CA014195/CA/NCI NIH HHS/ -- R01 AI089824/AI/NIAID NIH HHS/ -- R01 AI101400/AI/NIAID NIH HHS/ -- R01 NS085296/NS/NINDS NIH HHS/ -- R01 NS085938/NS/NINDS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Apr 14;532(7598):240-4. doi: 10.1038/nature17630. Epub 2016 Apr 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA. ; Instituto de Investigaciones Biomedicas Alberto Sols (CSIC-UAM), Madrid 28029, Spain. ; Waitt Advanced Biophotonics Center, The Salk Institute for Biological Studies, La Jolla, California 92037, USA. ; Joint Master in Neuroscience Program, University of Strasbourg, Strasbourg 67081, France. ; Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06520, USA. ; Immunobiology and Microbial Pathogenesis Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27049947" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis ; Brain/blood supply/cytology/*metabolism/pathology ; Brain Injuries/metabolism/pathology ; Disease Models, Animal ; Female ; Inflammation/metabolism ; Intercellular Signaling Peptides and Proteins/metabolism ; Ligands ; Male ; Mice ; Microglia/*physiology ; Neurogenesis ; Parkinson Disease/metabolism ; Phagocytosis ; Protein S/metabolism ; Proto-Oncogene Proteins/deficiency/*metabolism ; Receptor Protein-Tyrosine Kinases/deficiency/*metabolism ; Signal Transduction ; Stem Cell Niche ; Up-Regulation
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  • 59
    Publication Date: 2016-03-31
    Description: Transected axons fail to regrow in the mature central nervous system. Astrocytic scars are widely regarded as causal in this failure. Here, using three genetically targeted loss-of-function manipulations in adult mice, we show that preventing astrocyte scar formation, attenuating scar-forming astrocytes, or ablating chronic astrocytic scars all failed to result in spontaneous regrowth of transected corticospinal, sensory or serotonergic axons through severe spinal cord injury (SCI) lesions. By contrast, sustained local delivery via hydrogel depots of required axon-specific growth factors not present in SCI lesions, plus growth-activating priming injuries, stimulated robust, laminin-dependent sensory axon regrowth past scar-forming astrocytes and inhibitory molecules in SCI lesions. Preventing astrocytic scar formation significantly reduced this stimulated axon regrowth. RNA sequencing revealed that astrocytes and non-astrocyte cells in SCI lesions express multiple axon-growth-supporting molecules. Our findings show that contrary to the prevailing dogma, astrocyte scar formation aids rather than prevents central nervous system axon regeneration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, Mark A -- Burda, Joshua E -- Ren, Yilong -- Ao, Yan -- O'Shea, Timothy M -- Kawaguchi, Riki -- Coppola, Giovanni -- Khakh, Baljit S -- Deming, Timothy J -- Sofroniew, Michael V -- MH099559A/MH/NIMH NIH HHS/ -- MH104069/MH/NIMH NIH HHS/ -- NS057624/NS/NINDS NIH HHS/ -- NS060677/NS/NINDS NIH HHS/ -- NS084030/NS/NINDS NIH HHS/ -- P30 NS062691/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Apr 14;532(7598):195-200. doi: 10.1038/nature17623. Epub 2016 Mar 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, David Geffen School of Medicine, University of California, Los Angeles, California 90095-1763, USA. ; Departments of Psychiatry and Neurology, David Geffen School of Medicine, University of California, Los Angeles, California 90095-1761, USA. ; Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, California 90095-1751, USA. ; Departments of Bioengineering, Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1600, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27027288" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Astrocytes/*pathology ; Axons/*physiology ; Central Nervous System/cytology/*pathology/*physiology ; Chondroitin Sulfate Proteoglycans/biosynthesis ; Cicatrix/*pathology/prevention & control ; Female ; Genomics ; Mice ; *Models, Biological ; *Nerve Regeneration ; Reproducibility of Results ; Spinal Cord Injuries/genetics/pathology
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  • 60
    Publication Date: 2016-03-24
    Description: Targeted, temporally regulated neural modulation is invaluable in determining the physiological roles of specific neural populations or circuits. Here we describe a system for non-invasive, temporal activation or inhibition of neuronal activity in vivo and its use to study central nervous system control of glucose homeostasis and feeding in mice. We are able to induce neuronal activation remotely using radio waves or magnetic fields via Cre-dependent expression of a GFP-tagged ferritin fusion protein tethered to the cation-conducting transient receptor potential vanilloid 1 (TRPV1) by a camelid anti-GFP antibody (anti-GFP-TRPV1). Neuronal inhibition via the same stimuli is achieved by mutating the TRPV1 pore, rendering the channel chloride-permeable. These constructs were targeted to glucose-sensing neurons in the ventromedial hypothalamus in glucokinase-Cre mice, which express Cre in glucose-sensing neurons. Acute activation of glucose-sensing neurons in this region increases plasma glucose and glucagon, lowers insulin levels and stimulates feeding, while inhibition reduces blood glucose, raises insulin levels and suppresses feeding. These results suggest that pancreatic hormones function as an effector mechanism of central nervous system circuits controlling blood glucose and behaviour. The method we employ obviates the need for permanent implants and could potentially be applied to study other neural processes or used to regulate other, even dispersed, cell types.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stanley, Sarah A -- Kelly, Leah -- Latcha, Kaamashri N -- Schmidt, Sarah F -- Yu, Xiaofei -- Nectow, Alexander R -- Sauer, Jeremy -- Dyke, Jonathan P -- Dordick, Jonathan S -- Friedman, Jeffrey M -- GM067545/GM/NIGMS NIH HHS/ -- GM095654/GM/NIGMS NIH HHS/ -- MH105941/MH/NIMH NIH HHS/ -- U01 MH105941/MH/NIMH NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Mar 31;531(7596):647-50. doi: 10.1038/nature17183. Epub 2016 Mar 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Genetics, Rockefeller University, New York, New York 10065, USA. ; Department of Chemical &Biological Engineering, Center for Biotechnology &Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York 12180, USA. ; Department of Radiology, Weill Cornell Medical College, New York, New York 10065, USA. ; Howard Hughes Medical Institute, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27007848" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood Glucose/*metabolism ; Eating/*physiology ; Ferritins/genetics/metabolism ; Glucagon/blood ; Glucokinase/metabolism ; Homeostasis ; Hypoglycemia/metabolism ; Insulin/blood ; Integrases/metabolism ; *Magnetic Fields ; Mice ; Neural Inhibition ; Neurons/*physiology ; Pancreatic Hormones/metabolism ; *Radio Waves ; Recombinant Fusion Proteins/genetics/metabolism ; TRPV Cation Channels/genetics/metabolism ; Time Factors ; Ventromedial Hypothalamic Nucleus/*cytology/*physiology
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  • 61
    Publication Date: 2016-04-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Arnold, Carrie -- England -- Nature. 2016 Apr 21;532(7599):292. doi: 10.1038/nature.2016.19755.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27111610" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibody Specificity/immunology ; Antivenins/*biosynthesis/economics/genetics/immunology ; Horses/immunology ; Humans ; Immunization, Passive ; Mice ; Snake Bites/immunology/mortality/*therapy ; Snake Venoms/*antagonists & inhibitors/genetics/immunology ; Synthetic Biology/*methods/*trends
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  • 62
    Publication Date: 2016-01-21
    Description: Regulatory T (Treg) cells expressing the transcription factor Foxp3 have a pivotal role in maintaining immunological self-tolerance; yet, excessive Treg cell activities suppress anti-tumour immune responses. Compared to the resting Treg (rTreg) cell phenotype in secondary lymphoid organs, Treg cells in non-lymphoid tissues exhibit an activated Treg (aTreg) cell phenotype. However, the function of aTreg cells and whether their generation can be manipulated are largely unexplored. Here we show that the transcription factor Foxo1, previously demonstrated to promote Treg cell suppression of lymphoproliferative diseases, has an unexpected function in inhibiting aTreg-cell-mediated immune tolerance in mice. We find that aTreg cells turned over at a slower rate than rTreg cells, but were not locally maintained in tissues. aTreg cell differentiation was associated with repression of Foxo1-dependent gene transcription, concomitant with reduced Foxo1 expression, cytoplasmic localization and enhanced phosphorylation at the Akt sites. Treg-cell-specific expression of an Akt-insensitive Foxo1 mutant prevented downregulation of lymphoid organ homing molecules, and impeded Treg cell homing to non-lymphoid organs, causing CD8(+) T-cell-mediated autoimmune diseases. Compared to Treg cells from healthy tissues, tumour-infiltrating Treg cells downregulated Foxo1 target genes more substantially. Expression of the Foxo1 mutant at a lower dose was sufficient to deplete tumour-associated Treg cells, activate effector CD8(+) T cells, and inhibit tumour growth without inflicting autoimmunity. Thus, Foxo1 inactivation is essential for the migration of aTreg cells that have a crucial function in suppressing CD8(+) T-cell responses; and the Foxo signalling pathway in Treg cells can be titrated to break tumour immune tolerance preferentially.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Luo, Chong T -- Liao, Will -- Dadi, Saida -- Toure, Ahmed -- Li, Ming O -- P30 CA008748/CA/NCI NIH HHS/ -- R01 AI102888-01A1/AI/NIAID NIH HHS/ -- England -- Nature. 2016 Jan 28;529(7587):532-6. doi: 10.1038/nature16486. Epub 2016 Jan 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Immunology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Louis V. Gerstner Jr Graduate School of Biomedical Sciences, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; New York Genome Center, New York, New York 10013, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26789248" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Autoimmunity/*immunology ; CD8-Positive T-Lymphocytes/*immunology ; Cell Differentiation ; Cell Movement/immunology ; Down-Regulation ; Female ; Forkhead Transcription Factors/biosynthesis/genetics/*metabolism ; Immune Tolerance/*immunology ; Lymphocyte Activation ; Lymphocytes, Tumor-Infiltrating/cytology/immunology/metabolism ; Male ; Mice ; Mutation ; Neoplasms/*immunology ; Phosphorylation ; Signal Transduction/immunology ; T-Lymphocytes, Regulatory/cytology/*immunology/*metabolism ; Transcription, Genetic
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 63
    Publication Date: 2016-02-26
    Description: Integrated genomic analysis of 456 pancreatic ductal adenocarcinomas identified 32 recurrently mutated genes that aggregate into 10 pathways: KRAS, TGF-beta, WNT, NOTCH, ROBO/SLIT signalling, G1/S transition, SWI-SNF, chromatin modification, DNA repair and RNA processing. Expression analysis defined 4 subtypes: (1) squamous; (2) pancreatic progenitor; (3) immunogenic; and (4) aberrantly differentiated endocrine exocrine (ADEX) that correlate with histopathological characteristics. Squamous tumours are enriched for TP53 and KDM6A mutations, upregulation of the TP63N transcriptional network, hypermethylation of pancreatic endodermal cell-fate determining genes and have a poor prognosis. Pancreatic progenitor tumours preferentially express genes involved in early pancreatic development (FOXA2/3, PDX1 and MNX1). ADEX tumours displayed upregulation of genes that regulate networks involved in KRAS activation, exocrine (NR5A2 and RBPJL), and endocrine differentiation (NEUROD1 and NKX2-2). Immunogenic tumours contained upregulated immune networks including pathways involved in acquired immune suppression. These data infer differences in the molecular evolution of pancreatic cancer subtypes and identify opportunities for therapeutic development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bailey, Peter -- Chang, David K -- Nones, Katia -- Johns, Amber L -- Patch, Ann-Marie -- Gingras, Marie-Claude -- Miller, David K -- Christ, Angelika N -- Bruxner, Tim J C -- Quinn, Michael C -- Nourse, Craig -- Murtaugh, L Charles -- Harliwong, Ivon -- Idrisoglu, Senel -- Manning, Suzanne -- Nourbakhsh, Ehsan -- Wani, Shivangi -- Fink, Lynn -- Holmes, Oliver -- Chin, Venessa -- Anderson, Matthew J -- Kazakoff, Stephen -- Leonard, Conrad -- Newell, Felicity -- Waddell, Nick -- Wood, Scott -- Xu, Qinying -- Wilson, Peter J -- Cloonan, Nicole -- Kassahn, Karin S -- Taylor, Darrin -- Quek, Kelly -- Robertson, Alan -- Pantano, Lorena -- Mincarelli, Laura -- Sanchez, Luis N -- Evers, Lisa -- Wu, Jianmin -- Pinese, Mark -- Cowley, Mark J -- Jones, Marc D -- Colvin, Emily K -- Nagrial, Adnan M -- Humphrey, Emily S -- Chantrill, Lorraine A -- Mawson, Amanda -- Humphris, Jeremy -- Chou, Angela -- Pajic, Marina -- Scarlett, Christopher J -- Pinho, Andreia V -- Giry-Laterriere, Marc -- Rooman, Ilse -- Samra, Jaswinder S -- Kench, James G -- Lovell, Jessica A -- Merrett, Neil D -- Toon, Christopher W -- Epari, Krishna -- Nguyen, Nam Q -- Barbour, Andrew -- Zeps, Nikolajs -- Moran-Jones, Kim -- Jamieson, Nigel B -- Graham, Janet S -- Duthie, Fraser -- Oien, Karin -- Hair, Jane -- Grutzmann, Robert -- Maitra, Anirban -- Iacobuzio-Donahue, Christine A -- Wolfgang, Christopher L -- Morgan, Richard A -- Lawlor, Rita T -- Corbo, Vincenzo -- Bassi, Claudio -- Rusev, Borislav -- Capelli, Paola -- Salvia, Roberto -- Tortora, Giampaolo -- Mukhopadhyay, Debabrata -- Petersen, Gloria M -- Australian Pancreatic Cancer Genome Initiative -- Munzy, Donna M -- Fisher, William E -- Karim, Saadia A -- Eshleman, James R -- Hruban, Ralph H -- Pilarsky, Christian -- Morton, Jennifer P -- Sansom, Owen J -- Scarpa, Aldo -- Musgrove, Elizabeth A -- Bailey, Ulla-Maja Hagbo -- Hofmann, Oliver -- Sutherland, Robert L -- Wheeler, David A -- Gill, Anthony J -- Gibbs, Richard A -- Pearson, John V -- Waddell, Nicola -- Biankin, Andrew V -- Grimmond, Sean M -- 103721/Z/14/Z/Wellcome Trust/United Kingdom -- A12481/Cancer Research UK/United Kingdom -- A18076/Cancer Research UK/United Kingdom -- C29717/A17263/Cancer Research UK/United Kingdom -- England -- Nature. 2016 Mar 3;531(7592):47-52. doi: 10.1038/nature16965. Epub 2016 Feb 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Queensland Centre for Medical Genomics, Institute for Molecular Bioscience, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia. ; Wolfson Wohl Cancer Research Centre, Institute of Cancer Sciences, University of Glasgow, Garscube Estate, Switchback Road, Bearsden, Glasgow G61 1BD, UK. ; The Kinghorn Cancer Centre, 370 Victoria St, Darlinghurst, and the Cancer Research Program, Garvan Institute of Medical Research, 384 Victoria St, Darlinghurst, Sydney, New South Wales 2010, Australia. ; Department of Surgery, Bankstown Hospital, Eldridge Road, Bankstown, Sydney, New South Wales 2200, Australia. ; South Western Sydney Clinical School, Faculty of Medicine, University of New South Wales, Liverpool, New South Wales 2170, Australia. ; QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia. ; Department of Molecular and Human Genetics, Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas 77030, USA. ; Michael DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas 77030, USA. ; Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas 77030, USA. ; Department of Human Genetics, University of Utah, Salt Lake City, Utah 84112, USA. ; Genetic and Molecular Pathology, SA Pathology, Adelaide, South Australia 5000, Australia. ; School of Biological Sciences, The University of Adelaide, Adelaide, South Australia 5000, Australia. ; Harvard Chan Bioinformatics Core, Harvard T. H. Chan School of Public Health, Boston, Massachusetts 02115, USA. ; Macarthur Cancer Therapy Centre, Campbelltown Hospital, New South Wales 2560, Australia. ; Department of Pathology. SydPath, St Vincent's Hospital, Sydney, NSW 2010, Australia. ; St Vincent's Clinical School, Faculty of Medicine, University of New South Wales, New South Wales 2052, Australia. ; School of Environmental &Life Sciences, University of Newcastle, Ourimbah, New South Wales 2258, Australia. ; Department of Surgery, Royal North Shore Hospital, St Leonards, Sydney, New South Wales 2065, Australia. ; University of Sydney, Sydney, New South Wales 2006, Australia. ; Tissue Pathology and Diagnostic Oncology, Royal Prince Alfred Hospital, Camperdown New South Wales 2050, Australia. ; School of Medicine, University of Western Sydney, Penrith, New South Wales 2175, Australia. ; Fiona Stanley Hospital, Robin Warren Drive, Murdoch, Western Australia 6150, Australia. ; Department of Gastroenterology, Royal Adelaide Hospital, North Terrace, Adelaide, South Australia 5000, Australia. ; Department of Surgery, Princess Alexandra Hospital, Ipswich Rd, Woollongabba, Queensland 4102, Australia. ; School of Surgery M507, University of Western Australia, 35 Stirling Hwy, Nedlands 6009, Australia and St John of God Pathology, 12 Salvado Rd, Subiaco, Western Australia 6008, Australia. ; Academic Unit of Surgery, School of Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow Royal Infirmary, Glasgow G4 OSF, UK. ; West of Scotland Pancreatic Unit, Glasgow Royal Infirmary, Glasgow G31 2ER, UK. ; Department of Medical Oncology, Beatson West of Scotland Cancer Centre, 1053 Great Western Road, Glasgow G12 0YN, UK. ; Department of Pathology, Southern General Hospital, Greater Glasgow &Clyde NHS, Glasgow G51 4TF, UK. ; GGC Bio-repository, Pathology Department, Southern General Hospital, 1345 Govan Road, Glasgow G51 4TY, UK. ; Department of Surgery, TU Dresden, Fetscherstr. 74, 01307 Dresden, Germany. ; Departments of Pathology and Translational Molecular Pathology, UT MD Anderson Cancer Center, Houston Texas 77030, USA. ; The David M. Rubenstein Pancreatic Cancer Research Center and Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Department of Pathology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA. ; Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA. ; ARC-Net Applied Research on Cancer Centre, University and Hospital Trust of Verona, Verona 37134, Italy. ; Department of Pathology and Diagnostics, University of Verona, Verona 37134, Italy. ; Department of Surgery, Pancreas Institute, University and Hospital Trust of Verona, Verona 37134, Italy. ; Department of Medical Oncology, Comprehensive Cancer Centre, University and Hospital Trust of Verona, Verona 37134, Italy. ; Mayo Clinic, Rochester, Minnesota 55905, USA. ; Elkins Pancreas Center, Baylor College of Medicine, One Baylor Plaza, MS226, Houston, Texas 77030-3411, USA. ; Cancer Research UK Beatson Institute, Glasgow G61 1BD, UK. ; Institute for Cancer Science, University of Glasgow, Glasgow G12 8QQ, UK. ; University of Melbourne, Parkville, Victoria 3010, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26909576" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Basic Helix-Loop-Helix Transcription Factors/genetics ; Carcinoma, Pancreatic ; Ductal/classification/genetics/immunology/metabolism/pathology ; Cell Line, Tumor ; DNA Methylation ; DNA-Binding Proteins/genetics ; Gene Expression Regulation, Neoplastic ; Gene Regulatory Networks ; Genes, Neoplasm/*genetics ; Genome, Human/*genetics ; *Genomics ; Hepatocyte Nuclear Factor 3-beta/genetics ; Hepatocyte Nuclear Factor 3-gamma/genetics ; Histone Demethylases/genetics ; Homeodomain Proteins/genetics ; Humans ; Mice ; Mutation/*genetics ; Nuclear Proteins/genetics ; Pancreatic Neoplasms/*classification/*genetics/immunology/metabolism/pathology ; Prognosis ; Receptors, Cytoplasmic and Nuclear/genetics ; Survival Analysis ; Trans-Activators/genetics ; Transcription Factors/genetics ; Transcription, Genetic ; Transcriptome ; Tumor Suppressor Protein p53/genetics ; Tumor Suppressor Proteins/genetics
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  • 64
    Publication Date: 2016-03-10
    Description: Inhibitory neurons regulate the adaptation of neural circuits to sensory experience, but the molecular mechanisms by which experience controls the connectivity between different types of inhibitory neuron to regulate cortical plasticity are largely unknown. Here we show that exposure of dark-housed mice to light induces a gene program in cortical vasoactive intestinal peptide (VIP)-expressing neurons that is markedly distinct from that induced in excitatory neurons and other subtypes of inhibitory neuron. We identify Igf1 as one of several activity-regulated genes that are specific to VIP neurons, and demonstrate that IGF1 functions cell-autonomously in VIP neurons to increase inhibitory synaptic input onto these neurons. Our findings further suggest that in cortical VIP neurons, experience-dependent gene transcription regulates visual acuity by activating the expression of IGF1, thus promoting the inhibition of disinhibitory neurons and affecting inhibition onto cortical pyramidal neurons.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4823817/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4823817/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mardinly, A R -- Spiegel, I -- Patrizi, A -- Centofante, E -- Bazinet, J E -- Tzeng, C P -- Mandel-Brehm, C -- Harmin, D A -- Adesnik, H -- Fagiolini, M -- Greenberg, M E -- P01 NS047572/NS/NINDS NIH HHS/ -- P30 HD018655/HD/NICHD NIH HHS/ -- R01 NS028829/NS/NINDS NIH HHS/ -- R37 NS028829/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Mar 17;531(7594):371-5. doi: 10.1038/nature17187. Epub 2016 Mar 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, University of California Berkeley, 205 Life Sciences Addition, Berkeley, California 94720, USA. ; Department of Neurobiology, Harvard Medical School, 220 Longwood Ave, Boston, Massachusetts 02115, USA. ; FM Kirby Neurobiology Center, Boston Children's Hospital, 3 Blackfan Circle, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26958833" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Female ; Insulin-Like Growth Factor I/*metabolism ; Male ; Mice ; Mice, Inbred C57BL ; *Neural Inhibition ; Neural Pathways ; Neuronal Plasticity ; Neurons/cytology/*metabolism/secretion ; Pyramidal Cells/metabolism ; Synapses/metabolism ; Vasoactive Intestinal Peptide/*metabolism ; Vision, Ocular/physiology ; Visual Cortex/*cytology/*physiology
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  • 65
    Publication Date: 2016-01-08
    Description: It has been known for more than 70 years that synaptic strength is dynamically regulated in a use-dependent manner. At synapses with a low initial release probability, closely spaced presynaptic action potentials can result in facilitation, a short-term form of enhancement in which each subsequent action potential evokes greater neurotransmitter release. Facilitation can enhance neurotransmitter release considerably and can profoundly influence information transfer across synapses, but the underlying mechanism remains a mystery. One proposed mechanism is that a specialized calcium sensor for facilitation transiently increases the probability of release, and this sensor is distinct from the fast sensors that mediate rapid neurotransmitter release. Yet such a sensor has never been identified, and its very existence has been disputed. Here we show that synaptotagmin 7 (Syt7) is a calcium sensor that is required for facilitation at several central synapses. In Syt7-knockout mice, facilitation is eliminated even though the initial probability of release and the presynaptic residual calcium signals are unaltered. Expression of wild-type Syt7 in presynaptic neurons restored facilitation, whereas expression of a mutated Syt7 with a calcium-insensitive C2A domain did not. By revealing the role of Syt7 in synaptic facilitation, these results resolve a longstanding debate about a widespread form of short-term plasticity, and will enable future studies that may lead to a deeper understanding of the functional importance of facilitation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4729191/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4729191/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jackman, Skyler L -- Turecek, Josef -- Belinsky, Justine E -- Regehr, Wade G -- NS032405/NS/NINDS NIH HHS/ -- P30 NS072030/NS/NINDS NIH HHS/ -- R01 NS032405/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Jan 7;529(7584):88-91. doi: 10.1038/nature16507.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Harvard Medical School, 220 Longwood Avenue, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26738595" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/*metabolism ; Calcium Signaling ; Female ; Male ; Mice ; Mice, Knockout ; Neuronal Plasticity ; Neurons/metabolism/secretion ; Neurotransmitter Agents/*secretion ; Presynaptic Terminals/metabolism ; Synapses/*metabolism/secretion ; *Synaptic Transmission ; Synaptotagmins/deficiency/genetics/*metabolism
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  • 66
    Publication Date: 2016-04-28
    Description: The bacterial CRISPR/Cas9 system allows sequence-specific gene editing in many organisms and holds promise as a tool to generate models of human diseases, for example, in human pluripotent stem cells. CRISPR/Cas9 introduces targeted double-stranded breaks (DSBs) with high efficiency, which are typically repaired by non-homologous end-joining (NHEJ) resulting in nonspecific insertions, deletions or other mutations (indels). DSBs may also be repaired by homology-directed repair (HDR) using a DNA repair template, such as an introduced single-stranded oligo DNA nucleotide (ssODN), allowing knock-in of specific mutations. Although CRISPR/Cas9 is used extensively to engineer gene knockouts through NHEJ, editing by HDR remains inefficient and can be corrupted by additional indels, preventing its widespread use for modelling genetic disorders through introducing disease-associated mutations. Furthermore, targeted mutational knock-in at single alleles to model diseases caused by heterozygous mutations has not been reported. Here we describe a CRISPR/Cas9-based genome-editing framework that allows selective introduction of mono- and bi-allelic sequence changes with high efficiency and accuracy. We show that HDR accuracy is increased dramatically by incorporating silent CRISPR/Cas-blocking mutations along with pathogenic mutations, and establish a method termed 'CORRECT' for scarless genome editing. By characterizing and exploiting a stereotyped inverse relationship between a mutation's incorporation rate and its distance to the DSB, we achieve predictable control of zygosity. Homozygous introduction requires a guide RNA targeting close to the intended mutation, whereas heterozygous introduction can be accomplished by distance-dependent suboptimal mutation incorporation or by use of mixed repair templates. Using this approach, we generated human induced pluripotent stem cells with heterozygous and homozygous dominant early onset Alzheimer's disease-causing mutations in amyloid precursor protein (APP(Swe)) and presenilin 1 (PSEN1(M146V)) and derived cortical neurons, which displayed genotype-dependent disease-associated phenotypes. Our findings enable efficient introduction of specific sequence changes with CRISPR/Cas9, facilitating study of human disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Paquet, Dominik -- Kwart, Dylan -- Chen, Antonia -- Sproul, Andrew -- Jacob, Samson -- Teo, Shaun -- Olsen, Kimberly Moore -- Gregg, Andrew -- Noggle, Scott -- Tessier-Lavigne, Marc -- 8 UL1 TR000043/TR/NCATS NIH HHS/ -- T32GM007739/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 May 5;533(7601):125-9. doi: 10.1038/nature17664. Epub 2016 Apr 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Brain Development and Repair, The Rockefeller University, 1230 York Avenue, New York, New York 10065, USA. ; The New York Stem Cell Foundation Research Institute, New York, New York 10032, USA. ; Weill Cornell Graduate School of Medical Sciences, The Rockefeller University and Sloan-Kettering Institute Tri-institutional MD-PhD Program, 1300 York Avenue, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27120160" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Age of Onset ; Alleles ; Alzheimer Disease/genetics ; Amyloid beta-Protein Precursor/genetics/secretion ; Animals ; Base Sequence ; CRISPR-Cas Systems/*genetics ; DNA Breaks, Double-Stranded ; DNA Cleavage ; DNA Repair/genetics ; Female ; Genes, Dominant/genetics ; Genetic Association Studies ; Genetic Engineering/*methods ; *Heterozygote ; *Homozygote ; Humans ; Induced Pluripotent Stem Cells/metabolism ; Male ; Mice ; Mutagenesis/*genetics ; Mutation/*genetics ; Presenilins/genetics ; RNA, Guide/genetics ; Sequence Homology ; Substrate Specificity ; Templates, Genetic
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  • 67
    Publication Date: 2016-04-07
    Description: In bright light, cone-photoreceptors are active and colour vision derives from a comparison of signals in cones with different visual pigments. This comparison begins in the retina, where certain retinal ganglion cells have 'colour-opponent' visual responses-excited by light of one colour and suppressed by another colour. In dim light, rod-photoreceptors are active, but colour vision is impossible because they all use the same visual pigment. Instead, the rod signals are thought to splice into retinal circuits at various points, in synergy with the cone signals. Here we report a new circuit for colour vision that challenges these expectations. A genetically identified type of mouse retinal ganglion cell called JAMB (J-RGC), was found to have colour-opponent responses, OFF to ultraviolet (UV) light and ON to green light. Although the mouse retina contains a green-sensitive cone, the ON response instead originates in rods. Rods and cones both contribute to the response over several decades of light intensity. Remarkably, the rod signal in this circuit is antagonistic to that from cones. For rodents, this UV-green channel may play a role in social communication, as suggested by spectral measurements from the environment. In the human retina, all of the components for this circuit exist as well, and its function can explain certain experiences of colour in dim lights, such as a 'blue shift' in twilight. The discovery of this genetically defined pathway will enable new targeted studies of colour processing in the brain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Joesch, Maximilian -- Meister, Markus -- England -- Nature. 2016 Apr 14;532(7598):236-9. doi: 10.1038/nature17158. Epub 2016 Apr 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harvard University, 52 Oxford Street, Cambridge, Massachusetts 02138, USA. ; Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27049951" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Color ; Color Perception/*physiology/radiation effects ; Color Vision/*physiology/radiation effects ; Darkness ; Female ; Humans ; Male ; Mice ; Models, Neurological ; Neural Pathways/*physiology/radiation effects ; Retinal Cone Photoreceptor Cells/*metabolism/radiation effects ; Retinal Ganglion Cells/metabolism/radiation effects ; Retinal Rod Photoreceptor Cells/*metabolism/radiation effects ; Synapses/metabolism/radiation effects ; Territoriality ; Ultraviolet Rays
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  • 68
    Publication Date: 2016-04-07
    Description: How tissue regeneration programs are triggered by injury has received limited research attention. Here we investigate the existence of enhancer regulatory elements that are activated in regenerating tissue. Transcriptomic analyses reveal that leptin b (lepb) is highly induced in regenerating hearts and fins of zebrafish. Epigenetic profiling identified a short DNA sequence element upstream and distal to lepb that acquires open chromatin marks during regeneration and enables injury-dependent expression from minimal promoters. This element could activate expression in injured neonatal mouse tissues and was divisible into tissue-specific modules sufficient for expression in regenerating zebrafish fins or hearts. Simple enhancer-effector transgenes employing lepb-linked sequences upstream of pro- or anti-regenerative factors controlled the efficacy of regeneration in zebrafish. Our findings provide evidence for 'tissue regeneration enhancer elements' (TREEs) that trigger gene expression in injury sites and can be engineered to modulate the regenerative potential of vertebrate organs.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4844022/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4844022/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kang, Junsu -- Hu, Jianxin -- Karra, Ravi -- Dickson, Amy L -- Tornini, Valerie A -- Nachtrab, Gregory -- Gemberling, Matthew -- Goldman, Joseph A -- Black, Brian L -- Poss, Kenneth D -- F32 HL120494/HL/NHLBI NIH HHS/ -- K08 HL116485/HL/NHLBI NIH HHS/ -- P01 HL089707/HL/NHLBI NIH HHS/ -- R01 GM074057/GM/NIGMS NIH HHS/ -- R01 HL064658/HL/NHLBI NIH HHS/ -- R01 HL081674/HL/NHLBI NIH HHS/ -- R01 HL089707/HL/NHLBI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Apr 14;532(7598):201-6. doi: 10.1038/nature17644. Epub 2016 Apr 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710, USA. ; Cardiovascular Research Institute, University of California, San Francisco, San Francisco, California 94143, USA. ; Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27049946" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation ; Animal Fins/injuries/metabolism ; Animals ; Animals, Newborn ; Cell Proliferation ; Chromatin Assembly and Disassembly/genetics ; Enhancer Elements, Genetic/*genetics ; Epigenesis, Genetic/genetics ; Female ; Gene Expression Profiling ; Gene Expression Regulation/genetics ; Heart ; Histones/chemistry/metabolism ; Leptin/biosynthesis/genetics ; Lysine/metabolism ; Male ; Mice ; Myocytes, Cardiac/cytology ; Organ Specificity/*genetics ; Promoter Regions, Genetic/genetics ; Regeneration/*genetics/*physiology ; Transgenes/genetics ; Wound Healing/*genetics ; Zebrafish/*genetics/*physiology ; Zebrafish Proteins/genetics
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  • 69
    Publication Date: 2016-03-31
    Description: It has been widely accepted that 5-methylcytosine is the only form of DNA methylation in mammalian genomes. Here we identify N(6)-methyladenine as another form of DNA modification in mouse embryonic stem cells. Alkbh1 encodes a demethylase for N(6)-methyladenine. An increase of N(6)-methyladenine levels in Alkbh1-deficient cells leads to transcriptional silencing. N(6)-methyladenine deposition is inversely correlated with the evolutionary age of LINE-1 transposons; its deposition is strongly enriched at young (〈1.5 million years old) but not old (〉6 million years old) L1 elements. The deposition of N(6)-methyladenine correlates with epigenetic silencing of such LINE-1 transposons, together with their neighbouring enhancers and genes, thereby resisting the gene activation signals during embryonic stem cell differentiation. As young full-length LINE-1 transposons are strongly enriched on the X chromosome, genes located on the X chromosome are also silenced. Thus, N(6)-methyladenine developed a new role in epigenetic silencing in mammalian evolution distinct from its role in gene activation in other organisms. Our results demonstrate that N(6)-methyladenine constitutes a crucial component of the epigenetic regulation repertoire in mammalian genomes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, Tao P -- Wang, Tao -- Seetin, Matthew G -- Lai, Yongquan -- Zhu, Shijia -- Lin, Kaixuan -- Liu, Yifei -- Byrum, Stephanie D -- Mackintosh, Samuel G -- Zhong, Mei -- Tackett, Alan -- Wang, Guilin -- Hon, Lawrence S -- Fang, Gang -- Swenberg, James A -- Xiao, Andrew Z -- P20GM103429/GM/NIGMS NIH HHS/ -- P30 ES010126/ES/NIEHS NIH HHS/ -- P42 ES005948/ES/NIEHS NIH HHS/ -- R01 GM114472-01/GM/NIGMS NIH HHS/ -- R01GM106024/GM/NIGMS NIH HHS/ -- R01GM114205-01/GM/NIGMS NIH HHS/ -- S10OD018445/OD/NIH HHS/ -- England -- Nature. 2016 Apr 21;532(7599):329-33. doi: 10.1038/nature17640. Epub 2016 Mar 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics and Yale Stem Cell Center, Yale School of Medicine, New Haven, Connecticut 06520, USA. ; Pacific Biosciences, 1380 Willow Road, Menlo Park, California 94025, USA. ; Environmental Sciences &Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA. ; Department of Genetics and Genomic Sciences and Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York 10029, USA. ; Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, USA. ; Yale Stem Cell Center and Department of Cell Biology, Yale School of Medicine, New Haven, Connecticut 06520, USA. ; Department of Molecular Biophysics &Biochemistry, Yale Center for Genome Analysis, Yale School of Medicine, New Haven, Connecticut 06520, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27027282" target="_blank"〉PubMed〈/a〉
    Keywords: Adenine/*analogs & derivatives/metabolism ; Animals ; Cell Differentiation/genetics ; *DNA Methylation ; DNA Transposable Elements/genetics ; DNA-(Apurinic or Apyrimidinic Site) Lyase/deficiency/genetics/metabolism ; Enhancer Elements, Genetic/genetics ; Epigenesis, Genetic/*genetics ; Evolution, Molecular ; Gene Silencing ; Long Interspersed Nucleotide Elements/genetics ; Mammals/genetics ; Mice ; Mouse Embryonic Stem Cells/cytology/*metabolism ; Up-Regulation/genetics ; X Chromosome/genetics/metabolism
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  • 70
    Publication Date: 2016-02-13
    Description: Haematopoietic stem cells (HSCs) are arguably the most extensively characterized tissue stem cells. Since the identification of HSCs by prospective isolation, complex multi-parameter flow cytometric isolation of phenotypic subsets has facilitated studies on many aspects of HSC biology, including self-renewal, differentiation, ageing, niche, and diversity. Here we demonstrate by unbiased multi-step screening, identification of a single gene, homeobox B5 (Hoxb5, also known as Hox-2.1), with expression in the bone marrow that is limited to long-term (LT)-HSCs in mice. Using a mouse single-colour tri-mCherry reporter driven by endogenous Hoxb5 regulation, we show that only the Hoxb5(+) HSCs exhibit long-term reconstitution capacity after transplantation in primary transplant recipients and, notably, in secondary recipients. Only 7-35% of various previously defined immunophenotypic HSCs are LT-HSCs. Finally, by in situ imaging of mouse bone marrow, we show that 〉94% of LT-HSCs (Hoxb5(+)) are directly attached to VE-cadherin(+) cells, implicating the perivascular space as a near-homogenous location of LT-HSCs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, James Y -- Miyanishi, Masanori -- Wang, Sean K -- Yamazaki, Satoshi -- Sinha, Rahul -- Kao, Kevin S -- Seita, Jun -- Sahoo, Debashis -- Nakauchi, Hiromitsu -- Weissman, Irving L -- F30-HL122096/HL/NHLBI NIH HHS/ -- R01 CA086065/CA/NCI NIH HHS/ -- R01 HL058770/HL/NHLBI NIH HHS/ -- T32 GM007365/GM/NIGMS NIH HHS/ -- U01 HL099999/HL/NHLBI NIH HHS/ -- England -- Nature. 2016 Feb 11;530(7589):223-7. doi: 10.1038/nature16943.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, California 94305, USA. ; Ludwig Center for Cancer Stem Cell Research and Medicine, Stanford University School of Medicine, Stanford, California 94305, USA. ; Division of Stem Cell Therapy, Center for Stem Cell Biology and Regenerative Medicine, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26863982" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD/metabolism ; Biomarkers/analysis ; Bone Marrow/metabolism ; Cadherins/metabolism ; Cell Self Renewal ; Gene Expression Regulation ; Genes, Reporter/genetics ; Hematopoietic Stem Cell Transplantation ; Hematopoietic Stem Cells/*cytology/*metabolism ; Homeodomain Proteins/genetics/*metabolism ; Immunophenotyping ; Male ; Mice ; Mice, Inbred C57BL ; *Stem Cell Niche
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  • 71
    Publication Date: 2016-03-17
    Description: CD8(+) T cells have a central role in antitumour immunity, but their activity is suppressed in the tumour microenvironment. Reactivating the cytotoxicity of CD8(+) T cells is of great clinical interest in cancer immunotherapy. Here we report a new mechanism by which the antitumour response of mouse CD8(+) T cells can be potentiated by modulating cholesterol metabolism. Inhibiting cholesterol esterification in T cells by genetic ablation or pharmacological inhibition of ACAT1, a key cholesterol esterification enzyme, led to potentiated effector function and enhanced proliferation of CD8(+) but not CD4(+) T cells. This is due to the increase in the plasma membrane cholesterol level of CD8(+) T cells, which causes enhanced T-cell receptor clustering and signalling as well as more efficient formation of the immunological synapse. ACAT1-deficient CD8(+) T cells were better than wild-type CD8(+) T cells at controlling melanoma growth and metastasis in mice. We used the ACAT inhibitor avasimibe, which was previously tested in clinical trials for treating atherosclerosis and showed a good human safety profile, to treat melanoma in mice and observed a good antitumour effect. A combined therapy of avasimibe plus an anti-PD-1 antibody showed better efficacy than monotherapies in controlling tumour progression. ACAT1, an established target for atherosclerosis, is therefore also a potential target for cancer immunotherapy.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4851431/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4851431/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, Wei -- Bai, Yibing -- Xiong, Ying -- Zhang, Jin -- Chen, Shuokai -- Zheng, Xiaojun -- Meng, Xiangbo -- Li, Lunyi -- Wang, Jing -- Xu, Chenguang -- Yan, Chengsong -- Wang, Lijuan -- Chang, Catharine C Y -- Chang, Ta-Yuan -- Zhang, Ti -- Zhou, Penghui -- Song, Bao-Liang -- Liu, Wanli -- Sun, Shao-cong -- Liu, Xiaolong -- Li, Bo-liang -- Xu, Chenqi -- HL 60306./HL/NHLBI NIH HHS/ -- R01 HL060306/HL/NHLBI NIH HHS/ -- England -- Nature. 2016 Mar 31;531(7596):651-5. doi: 10.1038/nature17412. Epub 2016 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉State Key Laboratory of Molecular Biology, National Center for Protein Science Shanghai, Shanghai Science Research Center, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China. ; State Key Laboratory of Molecular Biology, CAS Center for Excellence in Molecular Cell Science, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China. ; Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China. ; MOE Key Laboratory of Protein Science, School of Life Sciences, Collaborative Innovation Center for Infectious Diseases, Tsinghua University, Beijing 100084, China. ; Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, New Haven 03755, USA. ; Rheumatology and Immunology Department of ChangZheng Hospital, Second Military Medical University, Shanghai 200433, China. ; Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou 510060, China. ; College of Life Sciences, Wuhan University, Wuhan, Hubei Province 430072, China. ; Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77054, USA. ; State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China. ; School of Life Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai 201210, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26982734" target="_blank"〉PubMed〈/a〉
    Keywords: Acetates/*pharmacology/therapeutic use ; Acetyl-CoA C-Acetyltransferase/antagonists & ; inhibitors/deficiency/genetics/metabolism ; Animals ; Atherosclerosis/drug therapy ; CD8-Positive T-Lymphocytes/*drug effects/*immunology/metabolism ; Cell Membrane/drug effects/metabolism ; Cholesterol/*metabolism ; Esterification/drug effects ; Female ; Immunological Synapses/drug effects/immunology/metabolism ; Immunotherapy/*methods ; Male ; Melanoma/*drug therapy/*immunology/metabolism/pathology ; Mice ; Programmed Cell Death 1 Receptor/antagonists & inhibitors/immunology ; Receptors, Antigen, T-Cell/immunology/metabolism ; Signal Transduction/drug effects ; Sulfonic Acids/*pharmacology/therapeutic use
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  • 72
    Publication Date: 2016-04-05
    Description: Cancer is a disease of ageing. Clinically, aged cancer patients tend to have a poorer prognosis than young. This may be due to accumulated cellular damage, decreases in adaptive immunity, and chronic inflammation. However, the effects of the aged microenvironment on tumour progression have been largely unexplored. Since dermal fibroblasts can have profound impacts on melanoma progression, we examined whether age-related changes in dermal fibroblasts could drive melanoma metastasis and response to targeted therapy. Here we find that aged fibroblasts secrete a Wnt antagonist, sFRP2, which activates a multi-step signalling cascade in melanoma cells that results in a decrease in beta-catenin and microphthalmia-associated transcription factor (MITF), and ultimately the loss of a key redox effector, APE1. Loss of APE1 attenuates the response of melanoma cells to DNA damage induced by reactive oxygen species, rendering the cells more resistant to targeted therapy (vemurafenib). Age-related increases in sFRP2 also augment both angiogenesis and metastasis of melanoma cells. These data provide an integrated view of how fibroblasts in the aged microenvironment contribute to tumour progression, offering new possibilities for the design of therapy for the elderly.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4833579/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4833579/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaur, Amanpreet -- Webster, Marie R -- Marchbank, Katie -- Behera, Reeti -- Ndoye, Abibatou -- Kugel, Curtis H 3rd -- Dang, Vanessa M -- Appleton, Jessica -- O'Connell, Michael P -- Cheng, Phil -- Valiga, Alexander A -- Morissette, Rachel -- McDonnell, Nazli B -- Ferrucci, Luigi -- Kossenkov, Andrew V -- Meeth, Katrina -- Tang, Hsin-Yao -- Yin, Xiangfan -- Wood, William H 3rd -- Lehrmann, Elin -- Becker, Kevin G -- Flaherty, Keith T -- Frederick, Dennie T -- Wargo, Jennifer A -- Cooper, Zachary A -- Tetzlaff, Michael T -- Hudgens, Courtney -- Aird, Katherine M -- Zhang, Rugang -- Xu, Xiaowei -- Liu, Qin -- Bartlett, Edmund -- Karakousis, Giorgos -- Eroglu, Zeynep -- Lo, Roger S -- Chan, Matthew -- Menzies, Alexander M -- Long, Georgina V -- Johnson, Douglas B -- Sosman, Jeffrey -- Schilling, Bastian -- Schadendorf, Dirk -- Speicher, David W -- Bosenberg, Marcus -- Ribas, Antoni -- Weeraratna, Ashani T -- P01 CA 114046-06/CA/NCI NIH HHS/ -- P01 CA114046/CA/NCI NIH HHS/ -- P30 CA010815/CA/NCI NIH HHS/ -- P50 CA093372/CA/NCI NIH HHS/ -- R01 CA174746/CA/NCI NIH HHS/ -- R01 CA174746-01/CA/NCI NIH HHS/ -- T32 CA009171/CA/NCI NIH HHS/ -- T32 CA9171-36/CA/NCI NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2016 Apr 14;532(7598):250-4. doi: 10.1038/nature17392. Epub 2016 Apr 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Wistar Institute, Philadelphia, Pennsylvania 19104, USA. ; University of the Sciences, Philadelphia, Pennsylvania 19104, USA. ; Department of Dermatology, University of Zurich, Zurich CH-8006, Switzerland. ; The National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224, USA. ; Department of Dermatology and Pathology, Yale University, New Haven, Connecticut 06511, USA. ; Massachusetts General Hospital Cancer Center, Developmental Therapeutics, Boston 02114, Massachusetts, USA. ; Department of Surgical Oncology, MD Anderson Cancer Center, Houston, Texas 77030, USA. ; Departments of Surgery and Pathology, Abramson Cancer Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. ; Department of Medical Oncology, City of Hope Medical Center, Duarte, California 91010, USA. ; Department of Medicine, Division of Hematology-Oncology, University of California Los Angeles, Los Angeles, California 90095, USA. ; Crown Princess Mary Cancer Centre, Westmead Hospital, Westmead 2145, Australia. ; Melanoma Institute Australia and The University of Sydney, Sydney 2000, Australia. ; Department of Medicine, Vanderbilt University Medical Center, Nashville Tennessee 37232, USA. ; Department of Dermatology, University Hospital, West German Cancer Center, University Duesburg-Essen, Essen, Germany. ; German Cancer Consortium (DKTK), Heidelberg 45127, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27042933" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Aging/*metabolism ; Animals ; Cell Line, Tumor ; Culture Media, Conditioned/pharmacology ; DNA Damage ; DNA-(Apurinic or Apyrimidinic Site) Lyase/metabolism ; Disease Progression ; *Drug Resistance, Neoplasm ; Fibroblasts/secretion ; Humans ; Indoles/pharmacology/therapeutic use ; Male ; Melanoma/blood supply/*drug therapy/genetics/*pathology ; Membrane Proteins/*metabolism/secretion ; Mice ; Microphthalmia-Associated Transcription Factor/metabolism ; Middle Aged ; Molecular Targeted Therapy ; *Neoplasm Metastasis ; Neovascularization, Pathologic ; Oxidative Stress ; Phenotype ; Reactive Oxygen Species/metabolism ; Sulfonamides/pharmacology/therapeutic use ; *Tumor Microenvironment ; Wnt Signaling Pathway ; Wnt1 Protein/antagonists & inhibitors ; beta Catenin/metabolism
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  • 73
    Publication Date: 2016-03-24
    Description: Endoplasmic reticulum (ER) stress is a major contributor to inflammatory diseases, such as Crohn disease and type 2 diabetes. ER stress induces the unfolded protein response, which involves activation of three transmembrane receptors, ATF6, PERK and IRE1alpha. Once activated, IRE1alpha recruits TRAF2 to the ER membrane to initiate inflammatory responses via the NF-kappaB pathway. Inflammation is commonly triggered when pattern recognition receptors (PRRs), such as Toll-like receptors or nucleotide-binding oligomerization domain (NOD)-like receptors, detect tissue damage or microbial infection. However, it is not clear which PRRs have a major role in inducing inflammation during ER stress. Here we show that NOD1 and NOD2, two members of the NOD-like receptor family of PRRs, are important mediators of ER-stress-induced inflammation in mouse and human cells. The ER stress inducers thapsigargin and dithiothreitol trigger production of the pro-inflammatory cytokine IL-6 in a NOD1/2-dependent fashion. Inflammation and IL-6 production triggered by infection with Brucella abortus, which induces ER stress by injecting the type IV secretion system effector protein VceC into host cells, is TRAF2, NOD1/2 and RIP2-dependent and can be reduced by treatment with the ER stress inhibitor tauroursodeoxycholate or an IRE1alpha kinase inhibitor. The association of NOD1 and NOD2 with pro-inflammatory responses induced by the IRE1alpha/TRAF2 signalling pathway provides a novel link between innate immunity and ER-stress-induced inflammation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4869892/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4869892/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Keestra-Gounder, A Marijke -- Byndloss, Mariana X -- Seyffert, Nubia -- Young, Briana M -- Chavez-Arroyo, Alfredo -- Tsai, April Y -- Cevallos, Stephanie A -- Winter, Maria G -- Pham, Oanh H -- Tiffany, Connor R -- de Jong, Maarten F -- Kerrinnes, Tobias -- Ravindran, Resmi -- Luciw, Paul A -- McSorley, Stephen J -- Baumler, Andreas J -- Tsolis, Renee M -- AI044170/AI/NIAID NIH HHS/ -- AI076246/AI/NIAID NIH HHS/ -- AI076278/AI/NIAID NIH HHS/ -- AI096528/AI/NIAID NIH HHS/ -- AI109799/AI/NIAID NIH HHS/ -- AI112258/AI/NIAID NIH HHS/ -- AI117303/AI/NIAID NIH HHS/ -- GM056765/GM/NIGMS NIH HHS/ -- R01 AI044170/AI/NIAID NIH HHS/ -- R01 AI076246/AI/NIAID NIH HHS/ -- R01 AI076278/AI/NIAID NIH HHS/ -- R01 AI096528/AI/NIAID NIH HHS/ -- R01 AI109799/AI/NIAID NIH HHS/ -- R21 AI112258/AI/NIAID NIH HHS/ -- R21 AI117303/AI/NIAID NIH HHS/ -- R25 GM056765/GM/NIGMS NIH HHS/ -- England -- Nature. 2016 Apr 21;532(7599):394-7. doi: 10.1038/nature17631. Epub 2016 Mar 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medical Microbiology and Immunology, School of Medicine, University of California at Davis, One Shields Ave, Davis, California 95616, USA. ; Center for Comparative Medicine, Schools of Medicine and Veterinary Medicine, University of California at Davis, One Shields Ave, Davis, California 95616, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27007849" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Outer Membrane Proteins/metabolism ; Brucella abortus/immunology/pathogenicity ; Cell Line ; Dithiothreitol/pharmacology ; Endoplasmic Reticulum/drug effects/pathology ; *Endoplasmic Reticulum Stress/drug effects ; Endoribonucleases/antagonists & inhibitors ; Female ; Humans ; Immunity, Innate ; Inflammation/chemically induced/*metabolism ; Interleukin-6/biosynthesis ; Male ; Mice ; Mice, Inbred C57BL ; NF-kappa B/metabolism ; Nod1 Signaling Adaptor Protein/immunology/*metabolism ; Nod2 Signaling Adaptor Protein/immunology/*metabolism ; Protein-Serine-Threonine Kinases/antagonists & inhibitors ; Receptors, Pattern Recognition/metabolism ; *Signal Transduction/drug effects ; TNF Receptor-Associated Factor 2/metabolism ; Taurochenodeoxycholic Acid/pharmacology ; Thapsigargin/pharmacology ; Unfolded Protein Response/drug effects
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  • 74
    Publication Date: 2016-02-26
    Description: The RAS/MAPK (mitogen-activated protein kinase) signalling pathway is frequently deregulated in non-small-cell lung cancer, often through KRAS activating mutations. A single endogenous mutant Kras allele is sufficient to promote lung tumour formation in mice but malignant progression requires additional genetic alterations. We recently showed that advanced lung tumours from Kras(G12D/+);p53-null mice frequently exhibit Kras(G12D) allelic enrichment (Kras(G12D)/Kras(wild-type) 〉 1) (ref. 7), implying that mutant Kras copy gains are positively selected during progression. Here we show, through a comprehensive analysis of mutant Kras homozygous and heterozygous mouse embryonic fibroblasts and lung cancer cells, that these genotypes are phenotypically distinct. In particular, Kras(G12D/G12D) cells exhibit a glycolytic switch coupled to increased channelling of glucose-derived metabolites into the tricarboxylic acid cycle and glutathione biosynthesis, resulting in enhanced glutathione-mediated detoxification. This metabolic rewiring is recapitulated in mutant KRAS homozygous non-small-cell lung cancer cells and in vivo, in spontaneous advanced murine lung tumours (which display a high frequency of Kras(G12D) copy gain), but not in the corresponding early tumours (Kras(G12D) heterozygous). Finally, we demonstrate that mutant Kras copy gain creates unique metabolic dependences that can be exploited to selectively target these aggressive mutant Kras tumours. Our data demonstrate that mutant Kras lung tumours are not a single disease but rather a heterogeneous group comprising two classes of tumours with distinct metabolic profiles, prognosis and therapeutic susceptibility, which can be discriminated on the basis of their relative mutant allelic content. We also provide the first, to our knowledge, in vivo evidence of metabolic rewiring during lung cancer malignant progression.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4780242/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4780242/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kerr, Emma M -- Gaude, Edoardo -- Turrell, Frances K -- Frezza, Christian -- Martins, Carla P -- MC_UU_12022/4/Medical Research Council/United Kingdom -- MC_UU_12022/6/Medical Research Council/United Kingdom -- Medical Research Council/United Kingdom -- England -- Nature. 2016 Mar 3;531(7592):110-3. doi: 10.1038/nature16967. Epub 2016 Feb 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MRC Cancer Unit, University of Cambridge, Box 197, Cambridge Biomedical Campus, Cambridge CB2 0XZ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26909577" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Carcinoma, Non-Small-Cell Lung/drug therapy/genetics/metabolism/pathology ; Cell Line, Tumor ; Cell Transformation, Neoplastic/drug effects/genetics/metabolism/pathology ; Citric Acid Cycle ; DNA Copy Number Variations/*genetics ; Disease Progression ; Female ; Fibroblasts/metabolism ; Genes, ras/*genetics ; Genotype ; Glucose/*metabolism ; Glutathione/biosynthesis/metabolism ; *Glycolysis ; Lung Neoplasms/*drug therapy/genetics/*metabolism/pathology ; Male ; Mice ; Mutation/*genetics ; Oxidation-Reduction ; Phenotype ; Prognosis
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  • 75
    Publication Date: 2016-03-31
    Description: Brown and beige adipose tissues can dissipate chemical energy as heat through thermogenic respiration, which requires uncoupling protein 1 (UCP1). Thermogenesis from these adipocytes can combat obesity and diabetes, encouraging investigation of factors that control UCP1-dependent respiration in vivo. Here we show that acutely activated thermogenesis in brown adipose tissue is defined by a substantial increase in levels of mitochondrial reactive oxygen species (ROS). Remarkably, this process supports in vivo thermogenesis, as pharmacological depletion of mitochondrial ROS results in hypothermia upon cold exposure, and inhibits UCP1-dependent increases in whole-body energy expenditure. We further establish that thermogenic ROS alter the redox status of cysteine thiols in brown adipose tissue to drive increased respiration, and that Cys253 of UCP1 is a key target. UCP1 Cys253 is sulfenylated during thermogenesis, while mutation of this site desensitizes the purine-nucleotide-inhibited state of the carrier to adrenergic activation and uncoupling. These studies identify mitochondrial ROS induction in brown adipose tissue as a mechanism that supports UCP1-dependent thermogenesis and whole-body energy expenditure, which opens the way to improved therapeutic strategies for combating metabolic disorders.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chouchani, Edward T -- Kazak, Lawrence -- Jedrychowski, Mark P -- Lu, Gina Z -- Erickson, Brian K -- Szpyt, John -- Pierce, Kerry A -- Laznik-Bogoslavski, Dina -- Vetrivelan, Ramalingam -- Clish, Clary B -- Robinson, Alan J -- Gygi, Steve P -- Spiegelman, Bruce M -- DK31405/DK/NIDDK NIH HHS/ -- Canadian Institutes of Health Research/Canada -- England -- Nature. 2016 Apr 7;532(7597):112-6. doi: 10.1038/nature17399. Epub 2016 Mar 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA. ; Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA. ; Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, USA. ; Department of Neurology, Harvard Medical School, Boston, Massachusetts 02215, USA. ; MRC Mitochondrial Biology Unit, Hills Road, Cambridge CB2 0XY, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27027295" target="_blank"〉PubMed〈/a〉
    Keywords: Adipose Tissue, Brown/chemistry/cytology/metabolism ; Animals ; Cell Respiration ; Cysteine/*chemistry/genetics/metabolism ; *Energy Metabolism/drug effects ; Female ; Humans ; Ion Channels/*chemistry/deficiency/genetics/*metabolism ; Male ; Mice ; Mice, Inbred C57BL ; Mitochondria/drug effects/*metabolism ; Mitochondrial Proteins/*chemistry/deficiency/genetics/*metabolism ; Mutant Proteins/chemistry/genetics/metabolism ; Oxidation-Reduction ; Reactive Oxygen Species/*metabolism ; Sulfhydryl Compounds/metabolism ; *Thermogenesis/drug effects
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  • 76
    Publication Date: 2016-04-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chu, Derrick M -- Aagaard, Kjersti M -- England -- Nature. 2016 Apr 21;532(7599):316-7. doi: 10.1038/nature17887. Epub 2016 Apr 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas 77030, USA. ; Departments of Molecular and Human Genetics, Molecular and Cell Biology, and Molecular Physiology and Biophysics, Baylor College of Medicine.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27074514" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Child, Preschool ; Chronic Disease ; Clostridium symbiosum/isolation & purification/physiology ; Diet/adverse effects/methods ; Feces/microbiology ; Female ; Germ-Free Life ; Growth Disorders/*diet therapy/etiology/*microbiology ; Healthy Volunteers ; Humans ; Infant ; Intestines/drug effects/*microbiology ; Liver/metabolism ; Malawi ; Malnutrition/complications/*diet therapy/*microbiology ; Mice ; Microbiota/drug effects/genetics/*physiology ; Milk, Human/chemistry/microbiology ; Mothers ; Oligosaccharides/analysis/pharmacology/therapeutic use ; Ruminococcus/isolation & purification/physiology ; Somatomedins/biosynthesis ; Weight Gain/drug effects
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  • 77
    Publication Date: 2016-03-31
    Description: Cerebral cavernous malformations (CCMs) are common inherited and sporadic vascular malformations that cause strokes and seizures in younger individuals. CCMs arise from endothelial cell loss of KRIT1, CCM2 or PDCD10, non-homologous proteins that form an adaptor complex. How disruption of the CCM complex results in disease remains controversial, with numerous signalling pathways (including Rho, SMAD and Wnt/beta-catenin) and processes such as endothelial-mesenchymal transition (EndMT) proposed to have causal roles. CCM2 binds to MEKK3 (refs 7, 8, 9, 10, 11), and we have recently shown that CCM complex regulation of MEKK3 is essential during vertebrate heart development. Here we investigate this mechanism in CCM disease pathogenesis. Using a neonatal mouse model of CCM disease, we show that expression of the MEKK3 target genes Klf2 and Klf4, as well as Rho and ADAMTS protease activity, are increased in the endothelial cells of early CCM lesions. By contrast, we find no evidence of EndMT or increased SMAD or Wnt signalling during early CCM formation. Endothelial-specific loss of Map3k3 (also known as Mekk3), Klf2 or Klf4 markedly prevents lesion formation, reverses the increase in Rho activity, and rescues lethality. Consistent with these findings in mice, we show that endothelial expression of KLF2 and KLF4 is increased in human familial and sporadic CCM lesions, and that a disease-causing human CCM2 mutation abrogates the MEKK3 interaction without affecting CCM complex formation. These studies identify gain of MEKK3 signalling and KLF2/4 function as causal mechanisms for CCM pathogenesis that may be targeted to develop new CCM therapeutics.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4864035/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4864035/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhou, Zinan -- Tang, Alan T -- Wong, Weng-Yew -- Bamezai, Sharika -- Goddard, Lauren M -- Shenkar, Robert -- Zhou, Su -- Yang, Jisheng -- Wright, Alexander C -- Foley, Matthew -- Arthur, J Simon C -- Whitehead, Kevin J -- Awad, Issam A -- Li, Dean Y -- Zheng, Xiangjian -- Kahn, Mark L -- P01 HL075215/HL/NHLBI NIH HHS/ -- P01 HL120846/HL/NHLBI NIH HHS/ -- P01 NS092521/NS/NINDS NIH HHS/ -- P01NS092521/NS/NINDS NIH HHS/ -- R01 HL094326/HL/NHLBI NIH HHS/ -- R01HL-084516/HL/NHLBI NIH HHS/ -- R01HL094326/HL/NHLBI NIH HHS/ -- R01NS075168/NS/NINDS NIH HHS/ -- T32HL07439/HL/NHLBI NIH HHS/ -- England -- Nature. 2016 Apr 7;532(7597):122-6. doi: 10.1038/nature17178. Epub 2016 Mar 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine and Cardiovascular Institute, University of Pennsylvania, 3400 Civic Center Blvd, Philadelphia, Pennsylvania 19104, USA. ; Laboratory of Cardiovascular Signaling, Centenary Institute, Sydney, New South Wales 2050, Australia. ; Neurovascular Surgery Program, Section of Neurosurgery, Department of Surgery, The University of Chicago Medicine and Biological Sciences, Chicago, Illinois 60637, USA. ; Department of Radiology, University of Pennsylvania Medical Center, 3400 Spruce Street, Philadelphia, Pennsylvania 19104, USA. ; Sydney Microscopy &Microanalysis, University of Sydney, Sydney, New South Wales 2050, Australia. ; Division of Cell Signaling and Immunology, University of Dundee, Dundee DD1 5EH, UK. ; Division of Cardiovascular Medicine and the Program in Molecular Medicine, University of Utah, Salt Lake City, Utah 84112, USA. ; The Key Laboratory for Human Disease Gene Study of Sichuan Province, Institute of Laboratory Medicine, Sichuan Academy of Medical Sciences &Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, China. ; Faculty of Medicine, Sydney Medical School, University of Sydney, Sydney, New South Wales 2050, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27027284" target="_blank"〉PubMed〈/a〉
    Keywords: ADAM Proteins/metabolism ; Animals ; Animals, Newborn ; Carrier Proteins/genetics/metabolism ; Disease Models, Animal ; Endothelial Cells/enzymology/*metabolism ; Female ; Hemangioma, Cavernous, Central Nervous System/etiology/*metabolism/pathology ; Humans ; Kruppel-Like Transcription Factors/deficiency/*metabolism ; MAP Kinase Kinase Kinase 3/deficiency/*metabolism ; *MAP Kinase Signaling System ; Male ; Mice ; Protein Binding ; rho GTP-Binding Proteins/metabolism
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  • 78
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2016-02-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reardon, Sara -- England -- Nature. 2016 Feb 18;530(7590):264. doi: 10.1038/nature.2016.19335.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26887470" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Feed/*analysis/standards ; Animal Nutritional Physiological Phenomena ; Animals ; *Animals, Laboratory/genetics/microbiology ; Confounding Factors (Epidemiology) ; Diet/standards/veterinary ; *Environment ; Female ; Gastrointestinal Microbiome ; *Housing, Animal ; Humans ; Lighting ; Male ; Mice ; Mice, Inbred Strains ; Models, Animal ; Reproducibility of Results ; *Research Design/standards
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  • 79
    Publication Date: 2016-02-04
    Description: Chronic opiate use induces opiate dependence, which is characterized by extremely unpleasant physical and emotional feelings after drug use is terminated. Both the rewarding effects of a drug and the desire to avoid withdrawal symptoms motivate continued drug use, and the nucleus accumbens is important for orchestrating both processes. While multiple inputs to the nucleus accumbens regulate reward, little is known about the nucleus accumbens circuitry underlying withdrawal. Here we identify the paraventricular nucleus of the thalamus as a prominent input to the nucleus accumbens mediating the expression of opiate-withdrawal-induced physical signs and aversive memory. Activity in the paraventricular nucleus of the thalamus to nucleus accumbens pathway is necessary and sufficient to mediate behavioural aversion. Selectively silencing this pathway abolishes aversive symptoms in two different mouse models of opiate withdrawal. Chronic morphine exposure selectively potentiates excitatory transmission between the paraventricular nucleus of the thalamus and D2-receptor-expressing medium spiny neurons via synaptic insertion of GluA2-lacking AMPA receptors. Notably, in vivo optogenetic depotentiation restores normal transmission at these synapses and robustly suppresses morphine withdrawal symptoms. This links morphine-evoked pathway- and cell-type-specific plasticity in the paraventricular nucleus of the thalamus to nucleus accumbens circuit to opiate dependence, and suggests that reprogramming this circuit holds promise for treating opiate addiction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhu, Yingjie -- Wienecke, Carl F R -- Nachtrab, Gregory -- Chen, Xiaoke -- 5T32DA035165-02/DA/NIDA NIH HHS/ -- T32 DA035165/DA/NIDA NIH HHS/ -- England -- Nature. 2016 Feb 11;530(7589):219-22. doi: 10.1038/nature16954. Epub 2016 Feb 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Stanford University, Stanford, California 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26840481" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Avoidance Learning ; Disease Models, Animal ; Long-Term Synaptic Depression ; Male ; Mice ; Mice, Inbred C57BL ; Morphine/administration & dosage/pharmacology ; *Neural Pathways/drug effects ; Neuronal Plasticity ; Neurons/drug effects/metabolism ; Nucleus Accumbens/drug effects/*physiopathology ; Opioid-Related Disorders/*physiopathology/therapy ; Optogenetics ; Rats, Sprague-Dawley ; Receptors, AMPA/metabolism ; Receptors, Dopamine D2/metabolism ; Reward ; Substance Withdrawal Syndrome/*physiopathology/therapy ; Synaptic Transmission/drug effects ; Thalamus/drug effects/pathology/*physiopathology
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  • 80
    Publication Date: 2016-03-17
    Description: The integrated stress response (ISR) is a homeostatic mechanism by which eukaryotic cells sense and respond to stress-inducing signals, such as amino acid starvation. General controlled non-repressed (GCN2) kinase is a key orchestrator of the ISR, and modulates protein synthesis in response to amino acid starvation. Here we demonstrate in mice that GCN2 controls intestinal inflammation by suppressing inflammasome activation. Enhanced activation of ISR was observed in intestinal antigen presenting cells (APCs) and epithelial cells during amino acid starvation, or intestinal inflammation. Genetic deletion of Gcn2 (also known as Eif2ka4) in CD11c(+) APCs or intestinal epithelial cells resulted in enhanced intestinal inflammation and T helper 17 cell (TH17) responses, owing to enhanced inflammasome activation and interleukin (IL)-1beta production. This was caused by reduced autophagy in Gcn2(-/-) intestinal APCs and epithelial cells, leading to increased reactive oxygen species (ROS), a potent activator of inflammasomes. Thus, conditional ablation of Atg5 or Atg7 in intestinal APCs resulted in enhanced ROS and TH17 responses. Furthermore, in vivo blockade of ROS and IL-1beta resulted in inhibition of TH17 responses and reduced inflammation in Gcn2(-/-) mice. Importantly, acute amino acid starvation suppressed intestinal inflammation via a mechanism dependent on GCN2. These results reveal a mechanism that couples amino acid sensing with control of intestinal inflammation via GCN2.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4854628/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4854628/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ravindran, Rajesh -- Loebbermann, Jens -- Nakaya, Helder I -- Khan, Nooruddin -- Ma, Hualing -- Gama, Leonardo -- Machiah, Deepa K -- Lawson, Benton -- Hakimpour, Paul -- Wang, Yi-chong -- Li, Shuzhao -- Sharma, Prachi -- Kaufman, Randal J -- Martinez, Jennifer -- Pulendran, Bali -- R01 DK088227/DK/NIDDK NIH HHS/ -- R01 DK103185/DK/NIDDK NIH HHS/ -- R37 AI048638/AI/NIAID NIH HHS/ -- R37 DK042394/DK/NIDDK NIH HHS/ -- R37 DK057665/DK/NIDDK NIH HHS/ -- U19 AI057266/AI/NIAID NIH HHS/ -- U19 AI090023/AI/NIAID NIH HHS/ -- ZIA ES103286-01/Intramural NIH HHS/ -- England -- Nature. 2016 Mar 24;531(7595):523-7. doi: 10.1038/nature17186. Epub 2016 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Emory Vaccine Center, Yerkes National Primate Research Center, 954 Gatewood Road, Atlanta, Georgia 30329, USA. ; School of Pharmaceutical Sciences, University of Sao Paulo, Sao Paulo 05508, Brazil. ; Department of Biotechnology and Bioinformatics, School of Life Sciences, University of Hyderabad, Hyderabad 500 046, India. ; Division of Pathology, Yerkes National Primate Research Center, 954 Gatewood Road, Atlanta, Georgia 30329, USA. ; Virology Core, Emory Vaccine Center and Yerkes National Primate Research Center, 954 Gatewood Road, Atlanta, Georgia 30329, USA. ; Degenerative Disease Program, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, California 92037 USA. ; National Institute of Environmental Health Sciences, Mail Drop D2-01 Research Triangle Park, North Carolina 27709, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26982722" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acids/administration & dosage/deficiency/*metabolism/pharmacology ; Animals ; Antigen-Presenting Cells/immunology/metabolism ; Autophagy ; Colitis/etiology/*metabolism/pathology/prevention & control ; Disease Models, Animal ; Epithelial Cells/metabolism ; Female ; Humans ; Inflammasomes/*antagonists & inhibitors/metabolism ; Inflammation/etiology/*metabolism/pathology/prevention & control ; Interleukin-1beta/immunology ; Intestines/*metabolism/*pathology ; Male ; Mice ; Microtubule-Associated Proteins/deficiency/metabolism ; Protein-Serine-Threonine Kinases/deficiency/genetics/*metabolism ; Reactive Oxygen Species/metabolism ; Stress, Physiological ; Th17 Cells/immunology ; Ubiquitin-Activating Enzymes/deficiency/metabolism
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  • 81
    Publication Date: 2016-05-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reardon, Sara -- England -- Nature. 2016 May 5;533(7601):15-6. doi: 10.1038/533015a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27147010" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Developmental Biology/methods ; Embryo Research/*ethics ; Embryo, Mammalian/cytology/*embryology/metabolism ; Embryonic Development ; Fertilization in Vitro ; Humans ; *Laboratories ; Mice ; Time Factors
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  • 82
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2016-02-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2016 Feb 18;530(7590):254. doi: 10.1038/530254a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26887455" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Feed/*analysis ; *Animal Nutritional Physiological Phenomena ; Animals ; Animals, Laboratory/*physiology ; Diet/*veterinary ; Environment ; Japan ; Longevity/*physiology ; Mice ; Models, Animal ; Reproducibility of Results ; Research Design
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  • 83
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2016-02-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wagner, Erwin F -- England -- Nature. 2016 Feb 4;530(7588):42-3. doi: 10.1038/530042a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Cancer Research Centre (CNIO), Department of Cancer Cell Biology, E-28029 Madrid, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26842052" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Disease Progression ; Fibroblasts/*cytology/*pathology ; I-kappa B Kinase/deficiency/genetics/metabolism ; Inflammation/immunology/pathology ; Intestinal Neoplasms/*immunology/*pathology/therapy ; Mice ; NF-kappa B/metabolism ; Signal Transduction ; Tumor Microenvironment/*physiology ; Uncertainty
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  • 84
    Publication Date: 2016-03-10
    Description: The eye is a complex organ with highly specialized constituent tissues derived from different primordial cell lineages. The retina, for example, develops from neuroectoderm via the optic vesicle, the corneal epithelium is descended from surface ectoderm, while the iris and collagen-rich stroma of the cornea have a neural crest origin. Recent work with pluripotent stem cells in culture has revealed a previously under-appreciated level of intrinsic cellular self-organization, with a focus on the retina and retinal cells. Moreover, we and others have demonstrated the in vitro induction of a corneal epithelial cell phenotype from pluripotent stem cells. These studies, however, have a single, tissue-specific focus and fail to reflect the complexity of whole eye development. Here we demonstrate the generation from human induced pluripotent stem cells of a self-formed ectodermal autonomous multi-zone (SEAM) of ocular cells. In some respects the concentric SEAM mimics whole-eye development because cell location within different zones is indicative of lineage, spanning the ocular surface ectoderm, lens, neuro-retina, and retinal pigment epithelium. It thus represents a promising resource for new and ongoing studies of ocular morphogenesis. The approach also has translational potential and to illustrate this we show that cells isolated from the ocular surface ectodermal zone of the SEAM can be sorted and expanded ex vivo to form a corneal epithelium that recovers function in an experimentally induced animal model of corneal blindness.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hayashi, Ryuhei -- Ishikawa, Yuki -- Sasamoto, Yuzuru -- Katori, Ryosuke -- Nomura, Naoki -- Ichikawa, Tatsuya -- Araki, Saori -- Soma, Takeshi -- Kawasaki, Satoshi -- Sekiguchi, Kiyotoshi -- Quantock, Andrew J -- Tsujikawa, Motokazu -- Nishida, Kohji -- England -- Nature. 2016 Mar 17;531(7594):376-80. doi: 10.1038/nature17000. Epub 2016 Mar 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Stem Cells and Applied Medicine, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan. ; Department of Ophthalmology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan. ; Laboratory of Extracellular Matrix Biochemistry, Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan. ; Structural Biophysics Group, School of Optometry and Vision Sciences, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF24 4HQ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26958835" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Lineage ; Cornea/*cytology/*growth & development/physiology ; Corneal Transplantation ; Ectoderm/cytology ; Epithelial Cells/cytology ; Epithelium, Corneal/cytology ; Female ; Humans ; Induced Pluripotent Stem Cells/*cytology ; Lens, Crystalline/cytology ; Mice ; Morphogenesis ; Phenotype ; Rabbits ; *Recovery of Function ; Retinal Pigment Epithelium/cytology
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  • 85
    Publication Date: 2016-01-28
    Description: Inflammasomes are intracellular protein complexes that drive the activation of inflammatory caspases. So far, four inflammasomes involving NLRP1, NLRP3, NLRC4 and AIM2 have been described that recruit the common adaptor protein ASC to activate caspase-1, leading to the secretion of mature IL-1beta and IL-18 proteins. The NLRP3 inflammasome has been implicated in the pathogenesis of several acquired inflammatory diseases as well as cryopyrin-associated periodic fever syndromes (CAPS) caused by inherited NLRP3 mutations. Potassium efflux is a common step that is essential for NLRP3 inflammasome activation induced by many stimuli. Despite extensive investigation, the molecular mechanism leading to NLRP3 activation in response to potassium efflux remains unknown. Here we report the identification of NEK7, a member of the family of mammalian NIMA-related kinases (NEK proteins), as an NLRP3-binding protein that acts downstream of potassium efflux to regulate NLRP3 oligomerization and activation. In the absence of NEK7, caspase-1 activation and IL-1beta release were abrogated in response to signals that activate NLRP3, but not NLRC4 or AIM2 inflammasomes. NLRP3-activating stimuli promoted the NLRP3-NEK7 interaction in a process that was dependent on potassium efflux. NLRP3 associated with the catalytic domain of NEK7, but the catalytic activity of NEK7 was shown to be dispensable for activation of the NLRP3 inflammasome. Activated macrophages formed a high-molecular-mass NLRP3-NEK7 complex, which, along with ASC oligomerization and ASC speck formation, was abrogated in the absence of NEK7. NEK7 was required for macrophages containing the CAPS-associated NLRP3(R258W) activating mutation to activate caspase-1. Mouse chimaeras reconstituted with wild-type, Nek7(-/-) or Nlrp3(-/-) haematopoietic cells showed that NEK7 was required for NLRP3 inflammasome activation in vivo. These studies demonstrate that NEK7 is an essential protein that acts downstream of potassium efflux to mediate NLRP3 inflammasome assembly and activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉He, Yuan -- Zeng, Melody Y -- Yang, Dahai -- Motro, Benny -- Nunez, Gabriel -- R01AI063331/AI/NIAID NIH HHS/ -- R01DK091191/DK/NIDDK NIH HHS/ -- T32 HL007517/HL/NHLBI NIH HHS/ -- T32DK094775/DK/NIDDK NIH HHS/ -- T32HL007517/HL/NHLBI NIH HHS/ -- England -- Nature. 2016 Feb 18;530(7590):354-7. doi: 10.1038/nature16959. Epub 2016 Jan 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA. ; The State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China. ; The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26814970" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis Regulatory Proteins/deficiency/genetics/metabolism ; Biocatalysis ; Carrier Proteins/chemistry/genetics/*metabolism ; Caspase 1/metabolism ; Catalytic Domain ; Cells, Cultured ; Cryopyrin-Associated Periodic Syndromes/genetics ; Enzyme Activation ; HEK293 Cells ; Humans ; Inflammasomes/*chemistry/*metabolism ; Interleukin-1beta/secretion ; Macrophages/metabolism ; Mice ; Mice, Inbred C57BL ; Potassium/*metabolism ; Protein Binding ; Protein Multimerization ; Protein-Serine-Threonine Kinases/chemistry/deficiency/genetics/*metabolism
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  • 86
    Publication Date: 2016-03-17
    Description: Lung metastasis is the lethal determinant in many cancers and a number of lines of evidence point to monocytes and macrophages having key roles in its development. Yet little is known about the immediate fate of incoming tumour cells as they colonize this tissue, and even less known about how they make first contact with the immune system. Primary tumours liberate circulating tumour cells (CTCs) into the blood and we have developed a stable intravital two-photon lung imaging model in mice for direct observation of the arrival of CTCs and subsequent host interaction. Here we show dynamic generation of tumour microparticles in shear flow in the capillaries within minutes of CTC entry. Rather than dispersing under flow, many of these microparticles remain attached to the lung vasculature or independently migrate along the inner walls of vessels. Using fluorescent lineage reporters and flow cytometry, we observed 'waves' of distinct myeloid cell subsets that load differentially and sequentially with this CTC-derived material. Many of these tumour-ingesting myeloid cells collectively accumulated in the lung interstitium along with the successful metastatic cells and, as previously understood, promote the development of successful metastases from surviving tumour cells. Although the numbers of these cells rise globally in the lung with metastatic exposure and ingesting myeloid cells undergo phenotypic changes associated with microparticle ingestion, a consistently sparse population of resident conventional dendritic cells, among the last cells to interact with CTCs, confer anti-metastatic protection. This work reveals that CTC fragmentation generates immune-interacting intermediates, and defines a competitive relationship between phagocyte populations for tumour loading during metastatic cell seeding.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Headley, Mark B -- Bins, Adriaan -- Nip, Alyssa -- Roberts, Edward W -- Looney, Mark R -- Gerard, Audrey -- Krummel, Matthew F -- P01 HL024136/HL/NHLBI NIH HHS/ -- R21 CA167601/CA/NCI NIH HHS/ -- R21CA167601/CA/NCI NIH HHS/ -- U54 CA163123/CA/NCI NIH HHS/ -- England -- Nature. 2016 Mar 24;531(7595):513-7. doi: 10.1038/nature16985. Epub 2016 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, University of California, San Francisco, 513 Parnassus Ave, HSW512, San Francisco, California 94143-0511, USA. ; Department of Medical Oncology, Academic Medical Center Amsterdam, Meibergdreef, 91105AZ Amsterdam, The Netherlands. ; Departments of Medicine and Laboratory Medicine, University of California, San Francisco, 513 Parnassus Avenue, HSW512, California 94143-0511, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26982733" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Capillaries/pathology ; Cell Line, Tumor ; Cell Lineage ; *Cell Movement ; Dendritic Cells/cytology/immunology ; Female ; Genes, Reporter/genetics ; Humans ; Lung/blood supply/cytology/*immunology/*pathology ; Lung Neoplasms/*immunology/pathology/*secondary ; Male ; Melanoma, Experimental/immunology/pathology ; Mice ; Microscopy, Confocal ; Myeloid Cells/cytology ; Neoplasm Metastasis/*immunology/*pathology ; Neoplastic Cells, Circulating/pathology
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  • 87
    Publication Date: 2016-04-14
    Description: Blood vessels define local microenvironments in the skeletal system, play crucial roles in osteogenesis and provide niches for haematopoietic stem cells. The properties of niche-forming vessels and their changes in the ageing organism remain incompletely understood. Here we show that Notch signalling in endothelial cells leads to the expansion of haematopoietic stem cell niches in bone, which involves increases in CD31-positive capillaries and platelet-derived growth factor receptor-beta (PDGFRbeta)-positive perivascular cells, arteriole formation and elevated levels of cellular stem cell factor. Although endothelial hypoxia-inducible factor signalling promotes some of these changes, it fails to enhance vascular niche function because of a lack of arterialization and expansion of PDGFRbeta-positive cells. In ageing mice, niche-forming vessels in the skeletal system are strongly reduced but can be restored by activation of endothelial Notch signalling. These findings indicate that vascular niches for haematopoietic stem cells are part of complex, age-dependent microenvironments involving multiple cell populations and vessel subtypes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kusumbe, Anjali P -- Ramasamy, Saravana K -- Itkin, Tomer -- Mae, Maarja Andaloussi -- Langen, Urs H -- Betsholtz, Christer -- Lapidot, Tsvee -- Adams, Ralf H -- England -- Nature. 2016 Apr 21;532(7599):380-4. doi: 10.1038/nature17638. Epub 2016 Apr 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck-Institute for Molecular Biomedicine, Department of Tissue Morphogenesis, and University of Munster, Faculty of Medicine, D-48149 Munster, Germany. ; Department of Immunology, The Weizmann Institute of Science, Rehovot 76100, Israel. ; Vascular Biology Program, Department of Immunology, Genetics and Pathology, Uppsala University, SE-751 85 Uppsala, Sweden. ; Department of Medical Biochemistry and Biophysics, Division of Vascular Biology, Karolinska Institute, Scheeles vag 2, SE-171 77 Stockholm, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27074508" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/*physiology ; Animals ; Antigens, CD31/metabolism ; Arterioles/cytology/*physiology ; Bone and Bones/*blood supply/cytology/metabolism ; Capillaries/cytology/*physiology ; Cell Count ; Endothelial Cells/metabolism ; Hematopoietic Stem Cells/*cytology ; Hypoxia-Inducible Factor 1/metabolism ; Male ; Mice ; Osteogenesis ; Receptor, Platelet-Derived Growth Factor beta/metabolism ; Receptors, Notch/metabolism ; Signal Transduction ; Stem Cell Factor/metabolism ; *Stem Cell Niche
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  • 88
    Publication Date: 2016-02-04
    Description: The DNA-binding protein PRDM9 directs positioning of the double-strand breaks (DSBs) that initiate meiotic recombination in mice and humans. Prdm9 is the only mammalian speciation gene yet identified and is responsible for sterility phenotypes in male hybrids of certain mouse subspecies. To investigate PRDM9 binding and its role in fertility and meiotic recombination, we humanized the DNA-binding domain of PRDM9 in C57BL/6 mice. This change repositions DSB hotspots and completely restores fertility in male hybrids. Here we show that alteration of one Prdm9 allele impacts the behaviour of DSBs controlled by the other allele at chromosome-wide scales. These effects correlate strongly with the degree to which each PRDM9 variant binds both homologues at the DSB sites it controls. Furthermore, higher genome-wide levels of such 'symmetric' PRDM9 binding associate with increasing fertility measures, and comparisons of individual hotspots suggest binding symmetry plays a downstream role in the recombination process. These findings reveal that subspecies-specific degradation of PRDM9 binding sites by meiotic drive, which steadily increases asymmetric PRDM9 binding, has impacts beyond simply changing hotspot positions, and strongly support a direct involvement in hybrid infertility. Because such meiotic drive occurs across mammals, PRDM9 may play a wider, yet transient, role in the early stages of speciation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4756437/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4756437/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davies, Benjamin -- Hatton, Edouard -- Altemose, Nicolas -- Hussin, Julie G -- Pratto, Florencia -- Zhang, Gang -- Hinch, Anjali Gupta -- Moralli, Daniela -- Biggs, Daniel -- Diaz, Rebeca -- Preece, Chris -- Li, Ran -- Bitoun, Emmanuelle -- Brick, Kevin -- Green, Catherine M -- Camerini-Otero, R Daniel -- Myers, Simon R -- Donnelly, Peter -- 090532/Z/09/Z/Wellcome Trust/United Kingdom -- 095552/Z/11/Z/Wellcome Trust/United Kingdom -- 098387/Z/12/Z/Wellcome Trust/United Kingdom -- Intramural NIH HHS/ -- England -- Nature. 2016 Feb 11;530(7589):171-6. doi: 10.1038/nature16931. Epub 2016 Feb 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Wellcome Trust Centre for Human Genetics, Roosevelt Drive, University of Oxford, Oxford OX3 7BN, UK. ; Department of Statistics, University of Oxford, 24-29 St. Giles', Oxford OX1 3LB, UK. ; Genetics and Biochemistry Branch, National Institute of Diabetes, Digestive and Kidney Diseases, NIH, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26840484" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Binding Sites ; Chromosome Pairing/genetics ; Chromosomes, Mammalian/genetics/metabolism ; DNA Breaks, Double-Stranded ; Female ; *Genetic Speciation ; Histone-Lysine N-Methyltransferase/*chemistry/genetics/*metabolism ; Humans ; Hybridization, Genetic/*genetics ; Infertility/*genetics ; Male ; Meiosis/genetics ; Mice ; Mice, Inbred C57BL ; Protein Binding ; *Protein Engineering ; Protein Structure, Tertiary/genetics ; Recombination, Genetic/genetics ; Zinc Fingers/*genetics
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  • 89
    Publication Date: 2016-04-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ward, Alyssa -- Baldwin, Thomas O -- Antin, Parker B -- England -- Nature. 2016 Apr 14;532(7598):177. doi: 10.1038/532177d.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Johns Hopkins University School of Medicine, Baltimore, Maryland, USA. ; University of California, Riverside, USA. ; University of Arizona, Tucson, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27075087" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Confounding Factors (Epidemiology) ; *Learning ; Mice ; Mice, Transgenic/genetics ; National Institutes of Health (U.S.)/economics ; Reproducibility of Results ; Research/*standards ; United States
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  • 90
    Publication Date: 2016-03-24
    Description: Primary cilia are solitary, generally non-motile, hair-like protrusions that extend from the surface of cells between cell divisions. Their antenna-like structure leads naturally to the assumption that they sense the surrounding environment, the most common hypothesis being sensation of mechanical force through calcium-permeable ion channels within the cilium. This Ca(2+)-responsive mechanosensor hypothesis for primary cilia has been invoked to explain a large range of biological responses, from control of left-right axis determination in embryonic development to adult progression of polycystic kidney disease and some cancers. Here we report the complete lack of mechanically induced calcium increases in primary cilia, in tissues upon which this hypothesis has been based. We developed a transgenic mouse, Arl13b-mCherry-GECO1.2, expressing a ratiometric genetically encoded calcium indicator in all primary cilia. We then measured responses to flow in primary cilia of cultured kidney epithelial cells, kidney thick ascending tubules, crown cells of the embryonic node, kinocilia of inner ear hair cells, and several cell lines. Cilia-specific Ca(2+) influxes were not observed in physiological or even highly supraphysiological levels of fluid flow. We conclude that mechanosensation, if it originates in primary cilia, is not via calcium signalling.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4851444/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4851444/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Delling, M -- Indzhykulian, A A -- Liu, X -- Li, Y -- Xie, T -- Corey, D P -- Clapham, D E -- 5R01 DC000304/DC/NIDCD NIH HHS/ -- P30-HD 18655/HD/NICHD NIH HHS/ -- R01 DC000304/DC/NIDCD NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Mar 31;531(7596):656-60. doi: 10.1038/nature17426. Epub 2016 Mar 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cardiology, Howard Hughes Medical Institute, Boston Children's Hospital, Boston, Massachusetts 02115, USA. ; Department of Neurobiology, Howard Hughes Medical Institute, Harvard Medical School, Boston, Massachusetts 02115, USA. ; Image and Data Analysis Core (IDAC), Harvard Medical School, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27007841" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/analysis/*metabolism ; Calcium Signaling ; Cilia/*metabolism ; Embryo, Mammalian/cytology ; Epithelial Cells/cytology ; Female ; Hair Cells, Auditory, Inner/cytology ; Kidney/cytology ; Male ; *Mechanotransduction, Cellular ; Mice ; Mice, Transgenic ; Models, Biological
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  • 91
    Publication Date: 2016-04-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ledford, Heidi -- England -- Nature. 2016 Apr 14;532(7598):162-4. doi: 10.1038/532162a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27075078" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/administration & ; dosage/immunology/pharmacology/therapeutic use ; Antigens, CD40/antagonists & inhibitors ; Antineoplastic Combined Chemotherapy Protocols/administration & ; dosage/pharmacology/*therapeutic use ; CTLA-4 Antigen/antagonists & inhibitors/immunology ; Cancer Vaccines/administration & dosage/immunology/therapeutic use ; Child ; Clinical Trials as Topic ; Endpoint Determination ; Epigenesis, Genetic/drug effects ; Humans ; *Immunotherapy/trends ; Melanoma/drug therapy/immunology ; Mice ; Neoplasms/*drug therapy/*immunology/therapy ; Precursor Cell Lymphoblastic Leukemia-Lymphoma/drug therapy/mortality ; Survivors ; T-Lymphocytes/drug effects/immunology
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  • 92
    Publication Date: 2016-03-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abbott, Alison -- England -- Nature. 2016 Mar 17;531(7594):294-7. doi: 10.1038/531294a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26983522" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/*etiology/metabolism/pathology ; Amyloid/administration & dosage/adverse effects/chemistry/metabolism ; Amyloid beta-Peptides/administration & dosage/adverse ; effects/chemistry/metabolism ; Animals ; Creutzfeldt-Jakob Syndrome/epidemiology/etiology/metabolism/pathology ; Drug Contamination ; Great Britain/epidemiology ; Growth Hormone/administration & dosage ; Humans ; Mice ; *Models, Biological ; Parkinson Disease/etiology/metabolism/pathology ; Prions/administration & dosage/adverse effects/chemistry/metabolism ; alpha-Synuclein/administration & dosage/adverse effects/chemistry/metabolism ; tau Proteins/metabolism
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  • 93
    Publication Date: 2016-01-28
    Description: Medulloblastoma is a highly malignant paediatric brain tumour, often inflicting devastating consequences on the developing child. Genomic studies have revealed four distinct molecular subgroups with divergent biology and clinical behaviour. An understanding of the regulatory circuitry governing the transcriptional landscapes of medulloblastoma subgroups, and how this relates to their respective developmental origins, is lacking. Here, using H3K27ac and BRD4 chromatin immunoprecipitation followed by sequencing (ChIP-seq) coupled with tissue-matched DNA methylation and transcriptome data, we describe the active cis-regulatory landscape across 28 primary medulloblastoma specimens. Analysis of differentially regulated enhancers and super-enhancers reinforced inter-subgroup heterogeneity and revealed novel, clinically relevant insights into medulloblastoma biology. Computational reconstruction of core regulatory circuitry identified a master set of transcription factors, validated by ChIP-seq, that is responsible for subgroup divergence, and implicates candidate cells of origin for Group 4. Our integrated analysis of enhancer elements in a large series of primary tumour samples reveals insights into cis-regulatory architecture, unrecognized dependencies, and cellular origins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, Charles Y -- Erkek, Serap -- Tong, Yiai -- Yin, Linlin -- Federation, Alexander J -- Zapatka, Marc -- Haldipur, Parthiv -- Kawauchi, Daisuke -- Risch, Thomas -- Warnatz, Hans-Jorg -- Worst, Barbara C -- Ju, Bensheng -- Orr, Brent A -- Zeid, Rhamy -- Polaski, Donald R -- Segura-Wang, Maia -- Waszak, Sebastian M -- Jones, David T W -- Kool, Marcel -- Hovestadt, Volker -- Buchhalter, Ivo -- Sieber, Laura -- Johann, Pascal -- Chavez, Lukas -- Groschel, Stefan -- Ryzhova, Marina -- Korshunov, Andrey -- Chen, Wenbiao -- Chizhikov, Victor V -- Millen, Kathleen J -- Amstislavskiy, Vyacheslav -- Lehrach, Hans -- Yaspo, Marie-Laure -- Eils, Roland -- Lichter, Peter -- Korbel, Jan O -- Pfister, Stefan M -- Bradner, James E -- Northcott, Paul A -- England -- Nature. 2016 Feb 4;530(7588):57-62. doi: 10.1038/nature16546. Epub 2016 Jan 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Medical Oncology, Dana Farber Cancer Institute (DFCI), Boston, Massachusetts 02215, USA. ; Genome Biology Unit, European Molecular Biology Laboratory (EMBL), 69117 Heidelberg, Germany. ; Division of Pediatric Neurooncology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany. ; Developmental Neurobiology, St Jude Children's Research Hospital, Memphis, Tennessee 38105, USA. ; Department of Molecular Physiology &Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37212, USA. ; Division of Molecular Genetics, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany. ; Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, Washington 98105, USA. ; Department of Vertebrate Genomics, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany. ; Department of Bone Marrow Transplantation &Cellular Therapy, St Jude Children's Research Hospital, Memphis, Tennessee 38105, USA. ; Department of Pathology, St Jude Children's Research Hospital, Memphis, Tennessee 38105, USA. ; German Cancer Consortium (DKTK), 69120 Heidelberg, Germany. ; Division of Theoretical Bioinformatics, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany. ; Department of Translational Oncology, NCT Heidelberg, 69120 Heidelberg, Germany. ; Department of Neuropathology, NN Burdenko Neurosurgical Institute, 125047 Moscow, Russia. ; Clinical Cooperation Unit Neuropathology, German Cancer Research Center (DKFZ), and Department of Neuropathology University Hospital, 69120 Heidelberg, Germany. ; Department of Anatomy and Neurobiology, University of Tennessee Health Sciences Center, Memphis, Tennessee 38163, USA. ; Department of Pediatrics, Genetics Division, University of Washington, Seattle, Washington 98195, USA. ; Institute of Pharmacy and Molecular Biotechnology and BioQuant, University of Heidelberg, 69117 Heidelberg, Germany. ; Department of Pediatrics, University of Heidelberg, 69117 Heidelberg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26814967" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cerebellar Neoplasms/classification/*genetics/*pathology ; Enhancer Elements, Genetic/*genetics ; Female ; Gene Expression Regulation, Neoplastic/*genetics ; Gene Regulatory Networks/genetics ; Genes, Neoplasm/genetics ; Genes, Reporter/genetics ; Humans ; Male ; Medulloblastoma/*classification/genetics/*pathology ; Mice ; Reproducibility of Results ; Transcription Factors/*metabolism ; Zebrafish/genetics
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  • 94
    Publication Date: 2016-03-17
    Description: Mutations disabling the TP53 tumour suppressor gene represent the most frequent events in human cancer and typically occur through a two-hit mechanism involving a missense mutation in one allele and a 'loss of heterozygosity' deletion encompassing the other. While TP53 missense mutations can also contribute gain-of-function activities that impact tumour progression, it remains unclear whether the deletion event, which frequently includes many genes, impacts tumorigenesis beyond TP53 loss alone. Here we show that somatic heterozygous deletion of mouse chromosome 11B3, a 4-megabase region syntenic to human 17p13.1, produces a greater effect on lymphoma and leukaemia development than Trp53 deletion. Mechanistically, the effect of 11B3 loss on tumorigenesis involves co-deleted genes such as Eif5a and Alox15b (also known as Alox8), the suppression of which cooperates with Trp53 loss to produce more aggressive disease. Our results imply that the selective advantage produced by human chromosome 17p deletion reflects the combined impact of TP53 loss and the reduced dosage of linked tumour suppressor genes.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4836395/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4836395/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Yu -- Chen, Chong -- Xu, Zhengmin -- Scuoppo, Claudio -- Rillahan, Cory D -- Gao, Jianjiong -- Spitzer, Barbara -- Bosbach, Benedikt -- Kastenhuber, Edward R -- Baslan, Timour -- Ackermann, Sarah -- Cheng, Lihua -- Wang, Qingguo -- Niu, Ting -- Schultz, Nikolaus -- Levine, Ross L -- Mills, Alea A -- Lowe, Scott W -- P30 CA008748/CA/NCI NIH HHS/ -- P30 CA016042/CA/NCI NIH HHS/ -- R01 CA190261/CA/NCI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 Mar 24;531(7595):471-5. doi: 10.1038/nature17157. Epub 2016 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Hematology and Department of Liver Surgery, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and National Collaborative Innovation Center, Chengdu 610041, China. ; Department of Cancer Biology and Genetics, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Institute for Cancer Genetics, Columbia University Medical Center, New York, New York 10032, USA. ; Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Human Oncology &Pathogenesis Program and Leukemia Service, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA. ; Department of Hematology &Research Laboratory of Hematology, West China Hospital, Sichuan University, Chengdu 610041, China. ; Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA. ; Howard Hughes Medical Institute, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26982726" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Cell Transformation, Neoplastic/genetics ; Chromosomes, Human, Pair 17/genetics ; Chromosomes, Mammalian/genetics ; Disease Models, Animal ; Disease Progression ; Female ; Genes, p53/*genetics ; Heterozygote ; Humans ; Leukemia, Myeloid, Acute/genetics/pathology ; Lymphoma/genetics/pathology ; Male ; Mice ; Neoplasms/*genetics/*pathology ; Peptide Initiation Factors/genetics/metabolism ; RNA-Binding Proteins/genetics/metabolism ; Sequence Deletion/*genetics ; Synteny/genetics ; Tumor Suppressor Protein p53/*deficiency
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  • 95
    Publication Date: 2016-01-15
    Description: The gut is home to trillions of microorganisms that have fundamental roles in many aspects of human biology, including immune function and metabolism. The reduced diversity of the gut microbiota in Western populations compared to that in populations living traditional lifestyles presents the question of which factors have driven microbiota change during modernization. Microbiota-accessible carbohydrates (MACs) found in dietary fibre have a crucial involvement in shaping this microbial ecosystem, and are notably reduced in the Western diet (high in fat and simple carbohydrates, low in fibre) compared with a more traditional diet. Here we show that changes in the microbiota of mice consuming a low-MAC diet and harbouring a human microbiota are largely reversible within a single generation. However, over several generations, a low-MAC diet results in a progressive loss of diversity, which is not recoverable after the reintroduction of dietary MACs. To restore the microbiota to its original state requires the administration of missing taxa in combination with dietary MAC consumption. Our data illustrate that taxa driven to low abundance when dietary MACs are scarce are inefficiently transferred to the next generation, and are at increased risk of becoming extinct within an isolated population. As more diseases are linked to the Western microbiota and the microbiota is targeted therapeutically, microbiota reprogramming may need to involve strategies that incorporate dietary MACs as well as taxa not currently present in the Western gut.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sonnenburg, Erica D -- Smits, Samuel A -- Tikhonov, Mikhail -- Higginbottom, Steven K -- Wingreen, Ned S -- Sonnenburg, Justin L -- R01-DK085025/DK/NIDDK NIH HHS/ -- England -- Nature. 2016 Jan 14;529(7585):212-5. doi: 10.1038/nature16504.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California 94305, USA. ; Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. ; Kavli Institute for Bionano Science and Technology, Harvard University, Cambridge, Massachusetts 02138, USA. ; Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, New Jersey 08544, USA. ; Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26762459" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Animals ; Bacteroidetes/drug effects ; Diet/*adverse effects ; Dietary Carbohydrates/administration & dosage ; Dietary Fiber/administration & dosage ; *Extinction, Biological ; Fecal Microbiota Transplantation ; Female ; Fermentation/drug effects ; *Gastrointestinal Microbiome/drug effects ; Gastrointestinal Tract/drug effects/microbiology ; Germ-Free Life ; Healthy Volunteers ; Humans ; Male ; Mice ; Pedigree
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  • 96
    Publication Date: 2016-01-21
    Description: Haematopoietic stem cells (HSCs), which sustain production of all blood cell lineages, rely on glycolysis for ATP production, yet little attention has been paid to the role of mitochondria. Here we show in mice that the short isoform of a critical regulator of HSCs, Prdm16 (refs 4, 5), induces mitofusin 2 (Mfn2), a protein involved in mitochondrial fusion and in tethering of mitochondria to the endoplasmic reticulum. Overexpression and deletion studies, including single-cell transplantation assays, revealed that Mfn2 is specifically required for the maintenance of HSCs with extensive lymphoid potential, but not, or less so, for the maintenance of myeloid-dominant HSCs. Mfn2 increased buffering of intracellular Ca(2+), an effect mediated through its endoplasmic reticulum-mitochondria tethering activity, thereby negatively regulating nuclear translocation and transcriptional activity of nuclear factor of activated T cells (Nfat). Nfat inhibition rescued the effects of Mfn2 deletion in HSCs, demonstrating that negative regulation of Nfat is the prime downstream mechanism of Mfn2 in the maintenance of HSCs with extensive lymphoid potential. Mitochondria therefore have an important role in HSCs. These findings provide a mechanism underlying clonal heterogeneity among HSCs and may lead to the design of approaches to bias HSC differentiation into desired lineages after transplantation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Luchsinger, Larry L -- de Almeida, Mariana Justino -- Corrigan, David J -- Mumau, Melanie -- Snoeck, Hans-Willem -- 1S10OD020056-01/OD/NIH HHS/ -- 1S10RR027050-01/RR/NCRR NIH HHS/ -- F31 CA196045/CA/NCI NIH HHS/ -- R01 AG029262/AG/NIA NIH HHS/ -- R01 CA167286/CA/NCI NIH HHS/ -- England -- Nature. 2016 Jan 28;529(7587):528-31. doi: 10.1038/nature16500. Epub 2016 Jan 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Columbia Center for Translational Immunology, Columbia University Medical Center, New York, New York 10032, USA. ; Department of Medicine, Columbia University Medical Center, New York, New York 10032, USA. ; Department of Microbiology and Immunology, Columbia University Medical Center, New York, New York 10032, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26789249" target="_blank"〉PubMed〈/a〉
    Keywords: Active Transport, Cell Nucleus ; Animals ; Calcium/metabolism ; Calcium Signaling ; Cell Differentiation ; Cell Lineage ; DNA-Binding Proteins/chemistry/metabolism ; Endoplasmic Reticulum/metabolism ; Female ; Fibroblasts ; GTP Phosphohydrolases/*metabolism ; Hematopoietic Stem Cells/*cytology/*metabolism ; Lymphocytes/*cytology/metabolism ; Male ; Mice ; Mitochondria/metabolism ; Mitochondrial Dynamics ; Myeloid Cells/cytology ; NFATC Transcription Factors/antagonists & inhibitors/metabolism ; Transcription Factors/chemistry/metabolism
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  • 97
    Publication Date: 2016-01-08
    Description: During ageing, muscle stem-cell regenerative function declines. At advanced geriatric age, this decline is maximal owing to transition from a normal quiescence into an irreversible senescence state. How satellite cells maintain quiescence and avoid senescence until advanced age remains unknown. Here we report that basal autophagy is essential to maintain the stem-cell quiescent state in mice. Failure of autophagy in physiologically aged satellite cells or genetic impairment of autophagy in young cells causes entry into senescence by loss of proteostasis, increased mitochondrial dysfunction and oxidative stress, resulting in a decline in the function and number of satellite cells. Re-establishment of autophagy reverses senescence and restores regenerative functions in geriatric satellite cells. As autophagy also declines in human geriatric satellite cells, our findings reveal autophagy to be a decisive stem-cell-fate regulator, with implications for fostering muscle regeneration in sarcopenia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Garcia-Prat, Laura -- Martinez-Vicente, Marta -- Perdiguero, Eusebio -- Ortet, Laura -- Rodriguez-Ubreva, Javier -- Rebollo, Elena -- Ruiz-Bonilla, Vanessa -- Gutarra, Susana -- Ballestar, Esteban -- Serrano, Antonio L -- Sandri, Marco -- Munoz-Canoves, Pura -- England -- Nature. 2016 Jan 7;529(7584):37-42. doi: 10.1038/nature16187.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cell Biology Group, Department of Experimental and Health Sciences, Pompeu Fabra University (UPF), CIBER on Neurodegenerative diseases (CIBERNED), E-08003 Barcelona, Spain. ; Neurodegenerative Diseases Research Group, Vall d'Hebron Research Institute-CIBERNED, E-08035 Barcelona, Spain. ; Chromatin and Disease Group, Cancer Epigenetics and Biology Programme (PEBC), Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, E-08907 Barcelona, Spain. ; Advanced Fluorescence Microscopy Unit, Molecular Biology Institute of Barcelona (IBMB-CSIC), E-08028 Barcelona, Spain. ; Department of Biomedical Science, University of Padova, 35100 Padova, Italy. ; Telethon Institute of Genetics and Medicine (TIGEM), 80131 Napoli, Italy. ; ICREA, E-08908 Barcelona, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26738589" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/pathology ; Animals ; Autophagy/*physiology ; *Cell Aging ; Cell Count ; Cyclin-Dependent Kinase Inhibitor p16/genetics ; Epigenesis, Genetic ; Homeostasis ; Humans ; Male ; Mice ; Mitochondria/metabolism/pathology ; Mitochondrial Degradation ; Muscle, Skeletal/cytology/pathology ; Organelles/metabolism ; Oxidative Stress ; Proteins/metabolism ; Reactive Oxygen Species/metabolism ; Regeneration ; Sarcopenia/pathology/prevention & control ; Satellite Cells, Skeletal Muscle/*cytology/pathology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 98
    Publication Date: 2016-03-05
    Description: Hepatocellular carcinoma (HCC) is the second most common cause of cancer-related death. Non-alcoholic fatty liver disease (NAFLD) affects a large proportion of the US population and is considered to be a metabolic predisposition to liver cancer. However, the role of adaptive immune responses in NAFLD-promoted HCC is largely unknown. Here we show, in mouse models and human samples, that dysregulation of lipid metabolism in NAFLD causes a selective loss of intrahepatic CD4(+) but not CD8(+) T lymphocytes, leading to accelerated hepatocarcinogenesis. We also demonstrate that CD4(+) T lymphocytes have greater mitochondrial mass than CD8(+) T lymphocytes and generate higher levels of mitochondrially derived reactive oxygen species (ROS). Disruption of mitochondrial function by linoleic acid, a fatty acid accumulated in NAFLD, causes more oxidative damage than other free fatty acids such as palmitic acid, and mediates selective loss of intrahepatic CD4(+) T lymphocytes. In vivo blockade of ROS reversed NAFLD-induced hepatic CD4(+) T lymphocyte decrease and delayed NAFLD-promoted HCC. Our results provide an unexpected link between lipid dysregulation and impaired anti-tumour surveillance.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4786464/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4786464/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ma, Chi -- Kesarwala, Aparna H -- Eggert, Tobias -- Medina-Echeverz, Jose -- Kleiner, David E -- Jin, Ping -- Stroncek, David F -- Terabe, Masaki -- Kapoor, Veena -- ElGindi, Mei -- Han, Miaojun -- Thornton, Angela M -- Zhang, Haibo -- Egger, Michele -- Luo, Ji -- Felsher, Dean W -- McVicar, Daniel W -- Weber, Achim -- Heikenwalder, Mathias -- Greten, Tim F -- ZIA BC011345-06/Intramural NIH HHS/ -- ZIABC011303/PHS HHS/ -- England -- Nature. 2016 Mar 10;531(7593):253-7. doi: 10.1038/nature16969. Epub 2016 Mar 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Gastrointestinal Malignancy Section, Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Radiation Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Cell Processing Section, Department of Transfusion Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Vaccine Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Experimental Transplantation and Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Laboratory of Cancer Biology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Institute of Surgical Pathology, University and University Hospital Zurich, Zurich 8091, Switzerland. ; Division of Oncology, Department of Medicine and Pathology, Stanford University, California 94305, USA. ; Cancer and Inflammation Program, National Cancer Institute, Frederick, Maryland 21702, USA. ; Institute of Virology, Technische Universitat Munchen/Helmholtz Zentrum Munchen, Munich 81675, Germany. ; Division of Chronic Inflammation and Cancer, German Cancer Research Center (DKFZ), Heidelberg 69120, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26934227" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; CD4-Positive T-Lymphocytes/immunology/metabolism/*pathology ; CD8-Positive T-Lymphocytes/immunology/pathology ; *Carcinogenesis/immunology/pathology ; Carcinoma, Hepatocellular/*immunology/metabolism/*pathology ; Case-Control Studies ; Choline/metabolism ; Diet ; Disease Models, Animal ; Genes, myc ; Hepatocytes/metabolism/pathology ; Humans ; Linoleic Acid/metabolism ; Lipid Metabolism ; Liver/immunology/pathology ; Liver Neoplasms/*immunology/metabolism/*pathology ; Male ; Methionine/deficiency ; Mice ; Mice, Inbred C57BL ; Mitochondria/metabolism/pathology ; Non-alcoholic Fatty Liver Disease/*immunology/metabolism/pathology ; Oxidative Stress ; Reactive Oxygen Species/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 99
    Publication Date: 2016-02-04
    Description: Cellular senescence, a stress-induced irreversible growth arrest often characterized by expression of p16(Ink4a) (encoded by the Ink4a/Arf locus, also known as Cdkn2a) and a distinctive secretory phenotype, prevents the proliferation of preneoplastic cells and has beneficial roles in tissue remodelling during embryogenesis and wound healing. Senescent cells accumulate in various tissues and organs over time, and have been speculated to have a role in ageing. To explore the physiological relevance and consequences of naturally occurring senescent cells, here we use a previously established transgene, INK-ATTAC, to induce apoptosis in p16(Ink4a)-expressing cells of wild-type mice by injection of AP20187 twice a week starting at one year of age. We show that compared to vehicle alone, AP20187 treatment extended median lifespan in both male and female mice of two distinct genetic backgrounds. The clearance of p16(Ink4a)-positive cells delayed tumorigenesis and attenuated age-related deterioration of several organs without apparent side effects, including kidney, heart and fat, where clearance preserved the functionality of glomeruli, cardio-protective KATP channels and adipocytes, respectively. Thus, p16(Ink4a)-positive cells that accumulate during adulthood negatively influence lifespan and promote age-dependent changes in several organs, and their therapeutic removal may be an attractive approach to extend healthy lifespan.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, Darren J -- Childs, Bennett G -- Durik, Matej -- Wijers, Melinde E -- Sieben, Cynthia J -- Zhong, Jian -- Saltness, Rachel A -- Jeganathan, Karthik B -- Verzosa, Grace Casaclang -- Pezeshki, Abdulmohammad -- Khazaie, Khashayarsha -- Miller, Jordan D -- van Deursen, Jan M -- AG041122/AG/NIA NIH HHS/ -- HL111121/HL/NHLBI NIH HHS/ -- P01 AG041122/AG/NIA NIH HHS/ -- R01 CA096985/CA/NCI NIH HHS/ -- R01CA96985/CA/NCI NIH HHS/ -- England -- Nature. 2016 Feb 11;530(7589):184-9. doi: 10.1038/nature16932. Epub 2016 Feb 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pediatric and Adolescent Medicine, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA. ; Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA. ; Division of Cardiovascular Surgery, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA. ; Department of Immunology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26840489" target="_blank"〉PubMed〈/a〉
    Keywords: Adipocytes/cytology/pathology/physiology ; Aging/*pathology/*physiology ; Animals ; Apoptosis ; Cell Aging/*physiology ; Cell Separation ; Cell Transformation, Neoplastic/pathology ; Cyclin-Dependent Kinase Inhibitor p16/*metabolism ; Epithelial Cells/cytology/pathology ; Female ; *Health ; Kidney/cytology/pathology/physiology/physiopathology ; Lipodystrophy/pathology ; Longevity/*physiology ; Male ; Mice ; Myocardium/cytology/metabolism/pathology ; Organ Specificity ; Stem Cells/cytology/pathology ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 100
    Publication Date: 2016-02-16
    Description: The vertebrate brain is highly complex, but its evolutionary origin remains elusive. Because of the absence of certain developmental domains generally marked by the expression of regulatory genes, the embryonic brain of the lamprey, a jawless vertebrate, had been regarded as representing a less complex, ancestral state of the vertebrate brain. Specifically, the absence of a Hedgehog- and Nkx2.1-positive domain in the lamprey subpallium was thought to be similar to mouse mutants in which the suppression of Nkx2-1 leads to a loss of the medial ganglionic eminence. Here we show that the brain of the inshore hagfish (Eptatretus burgeri), another cyclostome group, develops domains equivalent to the medial ganglionic eminence and rhombic lip, resembling the gnathostome brain. Moreover, further investigation of lamprey larvae revealed that these domains are also present, ruling out the possibility of convergent evolution between hagfish and gnathostomes. Thus, brain regionalization as seen in crown gnathostomes is not an evolutionary innovation of this group, but dates back to the latest vertebrate ancestor before the divergence of cyclostomes and gnathostomes more than 500 million years ago.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sugahara, Fumiaki -- Pascual-Anaya, Juan -- Oisi, Yasuhiro -- Kuraku, Shigehiro -- Aota, Shin-ichi -- Adachi, Noritaka -- Takagi, Wataru -- Hirai, Tamami -- Sato, Noboru -- Murakami, Yasunori -- Kuratani, Shigeru -- England -- Nature. 2016 Mar 3;531(7592):97-100. doi: 10.1038/nature16518. Epub 2016 Feb 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Evolutionary Morphology Laboratory, RIKEN, Kobe 650-0047, Japan. ; Division of Biology, Hyogo College of Medicine, Nishinomiya 663-8501, Japan. ; Development and Function of Inhibitory Neural Circuits, Max Planck Florida Institute for Neuroscience, Jupiter, Florida 33458, USA. ; Phyloinformatics Unit, RIKEN Center for Life Science Technologies, Kobe 650-0047, Japan. ; Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois 60637, USA. ; Division of Gross Anatomy and Morphogenesis, Niigata University Graduate School of Medical and Dental Sciences, Niigata 950-8510, Japan. ; Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26878236" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*anatomy & histology/*embryology ; Female ; Hagfishes/*anatomy & histology/*embryology/genetics ; Humans ; Lampreys/*anatomy & histology/*embryology/genetics/growth & development ; Larva/anatomy & histology ; Male ; Mice ; Molecular Sequence Data ; *Phylogeny ; Synteny/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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