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  • Mice  (2,147)
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  • Nature Publishing Group (NPG)  (2,610)
  • Alliance for Coastal Technologies
  • 1
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    Evaluating approaches and technologies for monitoring organic contaminants in the aquatic environment, Ann Arbor, MI, July 21-23, 2006: workshop proceedings (2021)
    Alliance for Coastal Technologies | Solomons, MD
    In:  http://aquaticcommons.org/id/eprint/3114 | 130 | 2011-09-29 17:51:58 | 3114 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-01
    Description: The Alliance for Coastal Technologies (ACT) convened a workshop on Evaluating Approaches and Technologies for Monitoring Organic Contaminants in the Aquatic Environment in Ann Arbor, MI on July 21-23, 2006. The primary objectives of this workshop were to: 1) identify the priority management information needs relative to organic contaminant loading; 2) explore themost appropriate approaches to estimating mass loading; and 3) evaluate the current status of thesensor technology. To meet these objectives, a mixture of leading research scientists, resourcemanagers, and industry representatives were brought together for a focused two-day workshop.The workshop featured four plenary talks followed by breakout sessions in which arranged groupsof participants where charged to respond to a series of focused discussion questions.At present, there are major concerns about the inadequacies in approaches and technologies forquantifying mass emissions and detection of organic contaminants for protecting municipal watersupplies and receiving waters. Managers use estimates of land-based contaminant loadings torivers, lakes, and oceans to assess relative risk among various contaminant sources, determinecompliance with regulatory standards, and define progress in source reduction. However, accuratelyquantifying contaminant loading remains a major challenge. Loading occurs over a range ofhydrologic conditions, requiring measurement technologies that can accommodate a broad rangeof ambient conditions. In addition, in situ chemical sensors that provide a means for acquiringcontinuous concentration measurements are still under development, particularly for organic contaminantsthat typically occur at low concentrations. Better approaches and strategies for estimatingcontaminant loading, including evaluations of both sampling design and sensor technologies,need to be identified. The following general recommendations were made in an effort to advancefuture organic contaminant monitoring:1. Improve the understanding of material balance in aquatic systems and the relationship betweenpotential surrogate measures (e.g., DOC, chlorophyll, particle size distribution) and target constituents.2. Develop continuous real-time sensors to be used by managers as screening measures and triggersfor more intensive monitoring.3. Pursue surrogate measures and indicators of organic pollutant contamination, such as CDOM,turbidity, or non-equilibrium partitioning.4. Develop continuous field-deployable sensors for PCBs, PAHs, pyrethroids, and emerging contaminantsof concern and develop strategies that couple sampling approaches with tools that incorporatesensor synergy (i.e., measure appropriate surrogates along with the dissolved organics toallow full mass emission estimation).[PDF contains 20 pages]
    Description: NOAA
    Description: Alliance for Coastal Technologies, CBL/UMCES
    Keywords: Engineering ; Earth Sciences ; Environment ; Chemistry
    Repository Name: AquaDocs
    Type: monograph
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    State of Technology for In Situ Measures of Salinity Using Conductive Temperature Sensors, Savannah, Georgia, December 3-5, 2007: workshop proceedings (2021)
    Alliance for Coastal Technologies | Solomons, MD
    In:  http://aquaticcommons.org/id/eprint/3110 | 130 | 2011-09-29 17:51:42 | 3110 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-01
    Description: This Alliance for Coastal Technologies (ACT) workshop was convened to assess the availabilityand state of development of conductivity-temperature sensors that can meet the needs of coastalmonitoring and management communities. Rased on the discussion, there are presently a numberof commercial sensor options available, with a wide range of package configurations suitable fordeployment in a range of coastal environments. However, some of the central questions posedin the workshop planning documents were left somewhat unresolved. The workshop descriptionemphasized coastal management requirements and, in particular, whether less expensive, easilydeployed, lower-resolution instruments might serve many management needs. While several participantsexpressed interest in this class of conductivity-temperature sensors, based on input fromthe manufacturers, it is not clear that simply relaxing the present level of resolution of existing instrumentswill result in instruments of significantly lower unit cost. Conductivity-temperature sensorsare available near or under the $1,000 unit cost that was operationally defined at the workshopas a breakpoint for what might be considered to be a "low cost" sensor. For the manufacturers, akey consideration before undertaking the effort to develop lower cost sensors is whether there willbe a significant market. In terms of defining "low cost," it was also emphasized that the "life cyclecosts" for a given instrument must be considered (e.g., including personnel costs for deploymentand maintenance). An adequate market survey to demonstrate likely applications and a viablemarket for lower cost sensors is needed. Another topic for the workshop was the introductionto the proposed ACT verification for conductivity-temperature sensors. Following a summaryof the process as envisioned by ACT, initial feedback was solicited. Protocol development willbe pursued further in a workshop involving ACT personnel and conductivity-temperature sensormanufacturers.[PDF contains 28 pages]
    Description: NOAA
    Description: Alliance for Coastal Technologies, CBL/UMCES
    Keywords: Earth Sciences ; Environment ; Chemistry
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    Applications of in situ Fluorometers in Nearshore waters, Cape Elizabeth, Maine, February 2-4,2005: workshop proceedings (2021)
    Alliance for Coastal Technologies | Solomons, MD
    In:  http://aquaticcommons.org/id/eprint/3126 | 130 | 2011-09-29 17:52:50 | 3126
    Details
    Publication Date: 2021-06-25
    Description: The Alliance for Coastal Technologies (ACT) Workshop "Applications of in situ Fluorometers inNearshore Waters" was held in Cape Elizabeth, Maine, February 2-4,2005, with sponsorship bythe Gulf of Maine Ocean Observing System (GoMOOS), one of the ACT partner organization.The purpose of the workshop was to explore recent trends in fluorometry as it relates to resourcemanagement applications in nearshore environments. Participants included representatives fromstate and federal environmental management agencies as well as research institutions, many ofwhom are currently using this technology in their research and management applications.Manufacturers and developers of fluorometric measuring systems also attended the meeting.The Workshop attendees discussed the historical and present uses of fluorometry technology andidentified the great potential for its use by coastal managers to fulfill their regulatory andmanagement objectives. Participants also identified some of the challenges associated with thecorrect use of Fluorometers to estimate biomass and the rate of primary productivity. TheWorkshop concluded that in order to expand the existing use of fluorometers in both academicand resource management disciplines, several issues concerning data collection, instrumentcalibration, and data interpretation needed to be addressed. Participants identified twelverecommendations, the top five of which are listed below:Recommendations1) Develop a "Guide" that describes the most important aspects of fluorescencemeasurements. This guide should be written by an expert party, with both research andindustry input, and should be distributed by all manufacturers with theirinstrumentation. The guide should also be made available on the ACT website as wellas those of other relevant organizations. The guide should include discussions on thefollowing topics:The benefits of using fluorometers in research and resource managementapplications;What fluorometers can and cannot provide in terms of measurements;The necessary assumptions required before applying fluorometry;Characterization and calibration of fluorometers; (pdf contains 32 pages)
    Description: NOAA
    Description: Alliance for Coastal Technologies, CBL/UMCES
    Keywords: Environment ; Chemistry
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    Human genome at ten: Life is complicated (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-04-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Check Hayden, Erika -- England -- Nature. 2010 Apr 1;464(7289):664-7. doi: 10.1038/464664a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20360709" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Data Mining ; Gene Expression Regulation ; Genes/genetics ; Genome, Human/*genetics ; Genomics/history/trends ; History, 20th Century ; History, 21st Century ; Human Genome Project/history ; Humans ; *Models, Biological ; Molecular Biology/*history ; Neoplasms/genetics/therapy ; RNA, Untranslated/genetics/metabolism ; Sea Urchins/embryology/genetics ; Systems Biology/*trends ; Tumor Suppressor Protein p53/chemistry/genetics/metabolism ; *Uncertainty
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
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    IkappaBzeta regulates T(H)17 development by cooperating with ROR nuclear receptors (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-04-13
    Description: Interleukin (IL)-17-producing helper T (T(H)17) cells are a distinct T-cell subset characterized by its pathological role in autoimmune diseases. IL-6 and transforming growth factor-beta (TGF-beta) induce T(H)17 development, in which the orphan nuclear receptors, RORgammat and RORalpha, have an indispensable role. However, in the absence of IL-6 and TGF-beta, the ectopic expression of RORgammat or RORalpha leads to only a modest IL-17 production. Here we identify a nuclear IkappaB family member, IkappaBzeta (encoded by the Nfkbiz gene), as a transcription factor required for T(H)17 development in mice. The ectopic expression of IkappaBzeta in naive CD4(+) T cells together with RORgammat or RORalpha potently induces T(H)17 development, even in the absence of IL-6 and TGF-beta. Notably, Nfkbiz(-/-) mice have a defect in T(H)17 development and a resistance to experimental autoimmune encephalomyelitis (EAE). The T-cell-intrinsic function of IkappaBzeta was clearly demonstrated by the resistance to EAE of the Rag2(-/-) mice into which Nfkbiz(-/-) CD4(+) T cells were transferred. In cooperation with RORgammat and RORalpha, IkappaBzeta enhances Il17a expression by binding directly to the regulatory region of the Il17a gene. This study provides evidence for the transcriptional mechanisms underlying T(H)17 development and points to a molecular basis for a novel therapeutic strategy against autoimmune disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Okamoto, Kazuo -- Iwai, Yoshiko -- Oh-Hora, Masatsugu -- Yamamoto, Masahiro -- Morio, Tomohiro -- Aoki, Kazuhiro -- Ohya, Keiichi -- Jetten, Anton M -- Akira, Shizuo -- Muta, Tatsushi -- Takayanagi, Hiroshi -- Z01-ES-101586/ES/NIEHS NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2010 Apr 29;464(7293):1381-5. doi: 10.1038/nature08922. Epub 2010 Apr 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20383124" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing ; Animals ; Coculture Techniques ; Dendritic Cells/cytology/immunology ; Encephalomyelitis, Autoimmune, Experimental/metabolism ; *Gene Expression Regulation ; Interleukin-17/biosynthesis/genetics/*metabolism ; Mice ; NF-kappa B p50 Subunit/metabolism ; Nuclear Proteins/deficiency/genetics/*metabolism ; Nuclear Receptor Subfamily 1, Group F, Member 1/genetics/*metabolism ; Nuclear Receptor Subfamily 1, Group F, Member 3/genetics/*metabolism ; Promoter Regions, Genetic/genetics ; T-Lymphocytes, Helper-Inducer/*cytology/*metabolism ; Transcription, Genetic
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  • 6
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    Role of Tet proteins in 5mC to 5hmC conversion, ES-cell self-renewal and inner cell mass specification (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-07-20
    Description: DNA methylation is one of the best-characterized epigenetic modifications. Although the enzymes that catalyse DNA methylation have been characterized, enzymes responsible for demethylation have been elusive. A recent study indicates that the human TET1 protein could catalyse the conversion of 5-methylcytosine (5mC) of DNA to 5-hydroxymethylcytosine (5hmC), raising the possibility that DNA demethylation may be a Tet1-mediated process. Here we extend this study by demonstrating that all three mouse Tet proteins (Tet1, Tet2 and Tet3) can also catalyse a similar reaction. Tet1 has an important role in mouse embryonic stem (ES) cell maintenance through maintaining the expression of Nanog in ES cells. Downregulation of Nanog via Tet1 knockdown correlates with methylation of the Nanog promoter, supporting a role for Tet1 in regulating DNA methylation status. Furthermore, knockdown of Tet1 in pre-implantation embryos results in a bias towards trophectoderm differentiation. Thus, our studies not only uncover the enzymatic activity of the Tet proteins, but also demonstrate a role for Tet1 in ES cell maintenance and inner cell mass cell specification.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3491567/" 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/PMC3491567/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ito, Shinsuke -- D'Alessio, Ana C -- Taranova, Olena V -- Hong, Kwonho -- Sowers, Lawrence C -- Zhang, Yi -- CA084487/CA/NCI NIH HHS/ -- GM68804/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2010 Aug 26;466(7310):1129-33. doi: 10.1038/nature09303.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20639862" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Methylcytosine/*metabolism ; Alkaline Phosphatase/metabolism ; Animals ; Blastocyst Inner Cell Mass/*metabolism ; Cell Proliferation ; Cytosine/*analogs & derivatives/metabolism ; DNA-Binding Proteins/genetics/*metabolism ; Embryonic Stem Cells/*cytology ; Gene Expression Regulation, Developmental ; Gene Knockdown Techniques ; Homeodomain Proteins/metabolism ; Mice ; Proto-Oncogene Proteins/genetics/*metabolism
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    Regulation of myeloid leukaemia by the cell-fate determinant Musashi (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-07-20
    Description: Chronic myelogenous leukaemia (CML) can progress from a slow growing chronic phase to an aggressive blast crisis phase, but the molecular basis of this transition remains poorly understood. Here we have used mouse models of CML to show that disease progression is regulated by the Musashi-Numb signalling axis. Specifically, we find that the chronic phase is marked by high levels of Numb expression whereas the blast crisis phase has low levels of Numb expression, and that ectopic expression of Numb promotes differentiation and impairs advanced-phase disease in vivo. As a possible explanation for the decreased levels of Numb in the blast crisis phase, we show that NUP98-HOXA9, an oncogene associated with blast crisis CML, can trigger expression of the RNA-binding protein Musashi2 (Msi2), which in turn represses Numb. Notably, loss of Msi2 restores Numb expression and significantly impairs the development and propagation of blast crisis CML in vitro and in vivo. Finally we show that Msi2 expression is not only highly upregulated during human CML progression but is also an early indicator of poorer prognosis. These data show that the Musashi-Numb pathway can control the differentiation of CML cells, and raise the possibility that targeting this pathway may provide a new strategy for the therapy of aggressive leukaemias.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2918284/" 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/PMC2918284/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ito, Takahiro -- Kwon, Hyog Young -- Zimdahl, Bryan -- Congdon, Kendra L -- Blum, Jordan -- Lento, William E -- Zhao, Chen -- Lagoo, Anand -- Gerrard, Gareth -- Foroni, Letizia -- Goldman, John -- Goh, Harriet -- Kim, Soo-Hyun -- Kim, Dong-Wook -- Chuah, Charles -- Oehler, Vivian G -- Radich, Jerald P -- Jordan, Craig T -- Reya, Tannishtha -- AI067798/AI/NIAID NIH HHS/ -- CA122206/CA/NCI NIH HHS/ -- CA140371/CA/NCI NIH HHS/ -- CA18029/CA/NCI NIH HHS/ -- DK072234/DK/NIDDK NIH HHS/ -- DK63031/DK/NIDDK NIH HHS/ -- DP1 CA174422/CA/NCI NIH HHS/ -- DP1 OD006430/OD/NIH HHS/ -- DP1 OD006430-01/OD/NIH HHS/ -- DP1 OD006430-02/OD/NIH HHS/ -- DP1OD006430/OD/NIH HHS/ -- HL097767/HL/NHLBI NIH HHS/ -- P01 CA018029/CA/NCI NIH HHS/ -- R01 CA140371/CA/NCI NIH HHS/ -- R01 DK063031/DK/NIDDK NIH HHS/ -- R01 DK063031-01/DK/NIDDK NIH HHS/ -- R01 DK063031-01S1/DK/NIDDK NIH HHS/ -- R01 DK063031-02/DK/NIDDK NIH HHS/ -- R01 DK063031-03/DK/NIDDK NIH HHS/ -- R01 DK063031-04/DK/NIDDK NIH HHS/ -- R01 DK063031-05/DK/NIDDK NIH HHS/ -- R01 DK063031-06/DK/NIDDK NIH HHS/ -- R01 DK063031-07/DK/NIDDK NIH HHS/ -- R01 DK063031-07S1/DK/NIDDK NIH HHS/ -- R01 DK063031-08/DK/NIDDK NIH HHS/ -- R01 DK072234/DK/NIDDK NIH HHS/ -- R01 DK072234-01A1/DK/NIDDK NIH HHS/ -- R01 DK072234-02/DK/NIDDK NIH HHS/ -- R01 DK072234-03/DK/NIDDK NIH HHS/ -- R01 DK072234-04/DK/NIDDK NIH HHS/ -- R01 HL097767/HL/NHLBI NIH HHS/ -- R01 HL097767-01/HL/NHLBI NIH HHS/ -- R01 HL097767-02/HL/NHLBI NIH HHS/ -- T32 GM007184-33/GM/NIGMS NIH HHS/ -- U19 AI067798/AI/NIAID NIH HHS/ -- U19 AI067798-010006/AI/NIAID NIH HHS/ -- U19 AI067798-020006/AI/NIAID NIH HHS/ -- U19 AI067798-030006/AI/NIAID NIH HHS/ -- U19 AI067798-040006/AI/NIAID NIH HHS/ -- U19 AI067798-050006/AI/NIAID NIH HHS/ -- England -- Nature. 2010 Aug 5;466(7307):765-8. doi: 10.1038/nature09171. Epub 2010 Jul 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology and Cancer Biology, 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/20639863" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blast Crisis/genetics/metabolism/pathology ; *Cell Differentiation/genetics ; Disease Progression ; Fusion Proteins, bcr-abl/genetics/metabolism ; Gene Expression Regulation, Neoplastic ; Homeodomain Proteins/genetics/metabolism ; Humans ; Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics/*metabolism/*pathology ; Membrane Proteins/biosynthesis/genetics/metabolism ; Mice ; Mice, Inbred C57BL ; Nerve Tissue Proteins/biosynthesis/genetics/metabolism ; Nuclear Pore Complex Proteins/genetics/metabolism ; Oncogene Proteins, Fusion/genetics/metabolism ; Prognosis ; RNA-Binding Proteins/biosynthesis/genetics/*metabolism ; Receptor, Notch1/metabolism ; Signal Transduction ; Tumor Suppressor Protein p53/metabolism ; Up-Regulation
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  • 8
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    Induction of tumour immunity by targeted inhibition of nonsense-mediated mRNA decay (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-05-14
    Description: The main reason why tumours are not controlled by the immune system is that, unlike pathogens, they do not express potent tumour rejection antigens (TRAs). Tumour vaccination aims at stimulating a systemic immune response targeted to, mostly weak, antigens expressed in the disseminated tumour lesions. Main challenges in developing effective vaccination protocols are the identification of potent and broadly expressed TRAs and effective adjuvants to stimulate a robust and durable immune response. Here we describe an alternative approach in which the expression of new, and thereby potent, antigens are induced in tumour cells by inhibiting nonsense-mediated messenger RNA decay (NMD). Small interfering RNA (siRNA)-mediated inhibition of NMD in tumour cells led to the expression of new antigenic determinants and their immune-mediated rejection. In subcutaneous and metastatic tumour models, tumour-targeted delivery of NMD factor-specific siRNAs conjugated to oligonucleotide aptamer ligands led to significant inhibition of tumour growth that was superior to that of vaccination with granulocyte-macrophage colony-stimulating factor (GM-CSF)-expressing irradiated tumour cells, and could be further enhanced by co-stimulation. Tumour-targeted NMD inhibition forms the basis of a simple, broadly useful, and clinically feasible approach to enhance the antigenicity of disseminated tumours leading to their immune recognition and rejection. The cell-free chemically synthesized oligonucleotide backbone of aptamer-siRNAs reduces the risk of immunogenicity and enhances the feasibility of generating reagents suitable for clinical use.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3107067/" 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/PMC3107067/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pastor, Fernando -- Kolonias, Despina -- Giangrande, Paloma H -- Gilboa, Eli -- R01 CA138503/CA/NCI NIH HHS/ -- R01 CA151857-02/CA/NCI NIH HHS/ -- England -- Nature. 2010 May 13;465(7295):227-30. doi: 10.1038/nature08999.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology & Immunology, Dodson Interdisciplinary Immunotherapy Institute, University of Miami Miller School of Medicine Miami, Florida 33134, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20463739" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Neoplasm/*genetics/*immunology ; Aptamers, Nucleotide/genetics ; Cancer Vaccines/genetics/immunology/metabolism ; Carrier Proteins/genetics ; Cell Line, Tumor ; Chickens/genetics ; Colonic Neoplasms/*genetics/*immunology/pathology ; Gene Expression Regulation, Neoplastic ; Granulocyte-Macrophage Colony-Stimulating Factor/genetics/metabolism ; Mice ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; Mice, Nude ; Neoplasm Transplantation ; RNA Interference ; RNA Stability/*genetics ; RNA, Small Interfering/*genetics/therapeutic use ; Xenograft Model Antitumor Assays
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    Lkb1 regulates quiescence and metabolic homeostasis of haematopoietic stem cells (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-12-03
    Description: The capacity to fine-tune cellular bioenergetics with the demands of stem-cell maintenance and regeneration is central to normal development and ageing, and to organismal survival during periods of acute stress. How energy metabolism and stem-cell homeostatic processes are coordinated is not well understood. Lkb1 acts as an evolutionarily conserved regulator of cellular energy metabolism in eukaryotic cells and functions as the major upstream kinase to phosphorylate AMP-activated protein kinase (AMPK) and 12 other AMPK-related kinases. Whether Lkb1 regulates stem-cell maintenance remains unknown. Here we show that Lkb1 has an essential role in haematopoietic stem cell (HSC) homeostasis. We demonstrate that ablation of Lkb1 in adult mice results in severe pancytopenia and subsequent lethality. Loss of Lkb1 leads to impaired survival and escape from quiescence of HSCs, resulting in exhaustion of the HSC pool and a marked reduction of HSC repopulating potential in vivo. Lkb1 deletion has an impact on cell proliferation in HSCs, but not on more committed compartments, pointing to context-specific functions for Lkb1 in haematopoiesis. The adverse impact of Lkb1 deletion on haematopoiesis was predominantly cell-autonomous and mTOR complex 1 (mTORC1)-independent, and involves multiple mechanisms converging on mitochondrial apoptosis and possibly downregulation of PGC-1 coactivators and their transcriptional network, which have critical roles in mitochondrial biogenesis and function. Thus, Lkb1 serves as an essential regulator of HSCs and haematopoiesis, and more generally, points to the critical importance of coupling energy metabolism and stem-cell homeostasis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3058342/" 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/PMC3058342/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gan, Boyi -- Hu, Jian -- Jiang, Shan -- Liu, Yingchun -- Sahin, Ergun -- Zhuang, Li -- Fletcher-Sananikone, Eliot -- Colla, Simona -- Wang, Y Alan -- Chin, Lynda -- Depinho, Ronald A -- 01CA141508/CA/NCI NIH HHS/ -- R21 CA135057/CA/NCI NIH HHS/ -- R21 CA135057-01/CA/NCI NIH HHS/ -- R21CA135057/CA/NCI NIH HHS/ -- U01 CA141508/CA/NCI NIH HHS/ -- U01 CA141508-01/CA/NCI NIH HHS/ -- England -- Nature. 2010 Dec 2;468(7324):701-4. doi: 10.1038/nature09595.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Belfer Institute for Applied Cancer Science, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21124456" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis ; Cell Cycle/*physiology ; Cell Proliferation ; Cell Survival ; *Energy Metabolism ; Female ; Gene Deletion ; Hematopoiesis ; Hematopoietic Stem Cells/*cytology/*metabolism/pathology ; *Homeostasis ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Mitochondria/metabolism/pathology ; Multiprotein Complexes ; Pancytopenia/genetics ; Phenotype ; Protein-Serine-Threonine Kinases/deficiency/genetics/*metabolism ; Proteins/metabolism ; Survival Analysis ; TOR Serine-Threonine Kinases ; Transcription Factors/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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    Germany rising (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-10-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2010 Sep 30;467(7315):499-500. doi: 10.1038/467499b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20881967" target="_blank"〉PubMed〈/a〉
    Keywords: European Union ; Financing, Organized/economics ; Germany ; History, 20th Century ; History, 21st Century ; Internationality ; Politics ; Research Support as Topic/economics/history ; Science/economics/history/*standards/*trends
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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