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  • Male  (48)
  • Nature Publishing Group (NPG)  (48)
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  • 1
    Publication Date: 2008-08-23
    Description: Adipose tissue is central to the regulation of energy balance. Two functionally different types of fat are present in mammals: white adipose tissue, the primary site of triglyceride storage, and brown adipose tissue, which is specialized in energy expenditure and can counteract obesity. Factors that specify the developmental fate and function of white and brown adipose tissue remain poorly understood. Here we demonstrate that whereas some members of the family of bone morphogenetic proteins (BMPs) support white adipocyte differentiation, BMP7 singularly promotes differentiation of brown preadipocytes even in the absence of the normally required hormonal induction cocktail. BMP7 activates a full program of brown adipogenesis including induction of early regulators of brown fat fate PRDM16 (PR-domain-containing 16; ref. 4) and PGC-1alpha (peroxisome proliferator-activated receptor-gamma (PPARgamma) coactivator-1alpha; ref. 5), increased expression of the brown-fat-defining marker uncoupling protein 1 (UCP1) and adipogenic transcription factors PPARgamma and CCAAT/enhancer-binding proteins (C/EBPs), and induction of mitochondrial biogenesis via p38 mitogen-activated protein (MAP) kinase-(also known as Mapk14) and PGC-1-dependent pathways. Moreover, BMP7 triggers commitment of mesenchymal progenitor cells to a brown adipocyte lineage, and implantation of these cells into nude mice results in development of adipose tissue containing mostly brown adipocytes. Bmp7 knockout embryos show a marked paucity of brown fat and an almost complete absence of UCP1. Adenoviral-mediated expression of BMP7 in mice results in a significant increase in brown, but not white, fat mass and leads to an increase in energy expenditure and a reduction in weight gain. These data reveal an important role of BMP7 in promoting brown adipocyte differentiation and thermogenesis in vivo and in vitro, and provide a potential new therapeutic approach for the treatment of obesity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2745972/" 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/PMC2745972/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tseng, Yu-Hua -- Kokkotou, Efi -- Schulz, Tim J -- Huang, Tian Lian -- Winnay, Jonathon N -- Taniguchi, Cullen M -- Tran, T Thien -- Suzuki, Ryo -- Espinoza, Daniel O -- Yamamoto, Yuji -- Ahrens, Molly J -- Dudley, Andrew T -- Norris, Andrew W -- Kulkarni, Rohit N -- Kahn, C Ronald -- K08 DK064906/DK/NIDDK NIH HHS/ -- K08 DK64906/DK/NIDDK NIH HHS/ -- P30 DK040561/DK/NIDDK NIH HHS/ -- P30 DK040561-13/DK/NIDDK NIH HHS/ -- P30 DK46200/DK/NIDDK NIH HHS/ -- R01 DK 060837/DK/NIDDK NIH HHS/ -- R01 DK077097/DK/NIDDK NIH HHS/ -- R01 DK077097-01A1/DK/NIDDK NIH HHS/ -- R01 DK077097-02/DK/NIDDK NIH HHS/ -- R01 DK67536/DK/NIDDK NIH HHS/ -- R21 DK070722/DK/NIDDK NIH HHS/ -- R21 DK070722-01/DK/NIDDK NIH HHS/ -- R21 DK070722-02/DK/NIDDK NIH HHS/ -- England -- Nature. 2008 Aug 21;454(7207):1000-4. doi: 10.1038/nature07221.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section on Obesity and Hormone Action, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts 02215, USA. yu-hua.tseng@joslin.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18719589" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3-L1 Cells ; *Adipogenesis ; Adipose Tissue, Brown/*growth & development/*metabolism ; Adipose Tissue, White/growth & development ; Animals ; Bone Morphogenetic Protein 7 ; Bone Morphogenetic Proteins/*metabolism ; Cell Line ; *Energy Metabolism/genetics ; Male ; Mesenchymal Stromal Cells/cytology/physiology ; Mice ; Mice, Inbred C57BL ; Mice, Nude ; Mitochondria/physiology ; Thermogenesis ; Transforming Growth Factor beta/*metabolism ; p38 Mitogen-Activated Protein Kinases/metabolism
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  • 2
    Publication Date: 2009-05-09
    Description: Chromatin modifications, especially histone-tail acetylation, have been implicated in memory formation. Increased histone-tail acetylation induced by inhibitors of histone deacetylases (HDACis) facilitates learning and memory in wild-type mice as well as in mouse models of neurodegeneration. Harnessing the therapeutic potential of HDACis requires knowledge of the specific HDAC family member(s) linked to cognitive enhancement. Here we show that neuron-specific overexpression of HDAC2, but not that of HDAC1, decreased dendritic spine density, synapse number, synaptic plasticity and memory formation. Conversely, Hdac2 deficiency resulted in increased synapse number and memory facilitation, similar to chronic treatment with HDACis in mice. Notably, reduced synapse number and learning impairment of HDAC2-overexpressing mice were ameliorated by chronic treatment with HDACis. Correspondingly, treatment with HDACis failed to further facilitate memory formation in Hdac2-deficient mice. Furthermore, analysis of promoter occupancy revealed an association of HDAC2 with the promoters of genes implicated in synaptic plasticity and memory formation. Taken together, our results suggest that HDAC2 functions in modulating synaptic plasticity and long-lasting changes of neural circuits, which in turn negatively regulates learning and memory. These observations encourage the development and testing of HDAC2-selective inhibitors for human diseases associated with memory impairment.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3498958/" 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/PMC3498958/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Guan, Ji-Song -- Haggarty, Stephen J -- Giacometti, Emanuela -- Dannenberg, Jan-Hermen -- Joseph, Nadine -- Gao, Jun -- Nieland, Thomas J F -- Zhou, Ying -- Wang, Xinyu -- Mazitschek, Ralph -- Bradner, James E -- DePinho, Ronald A -- Jaenisch, Rudolf -- Tsai, Li-Huei -- R01 DA028301/DA/NIDA NIH HHS/ -- R01 DA028301-02/DA/NIDA NIH HHS/ -- R01 NS051874/NS/NINDS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 May 7;459(7243):55-60. doi: 10.1038/nature07925.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19424149" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Butyrates/pharmacology ; Dendritic Spines/physiology ; Electrical Synapses/*physiology ; Female ; Gene Expression Regulation ; Hippocampus/metabolism ; Histone Deacetylase 1 ; Histone Deacetylase 2 ; Histone Deacetylase Inhibitors ; Histone Deacetylases/deficiency/genetics/*metabolism ; Hydroxamic Acids/pharmacology ; Learning/drug effects ; Male ; Memory/drug effects/*physiology ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Neurons/metabolism ; Promoter Regions, Genetic/genetics ; Repressor Proteins/antagonists & inhibitors/genetics/*metabolism ; Sodium/pharmacology
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  • 3
    Publication Date: 2009-08-28
    Description: Sex in birds is chromosomally based, as in mammals, but the sex chromosomes are different and the mechanism of avian sex determination has been a long-standing mystery. In the chicken and all other birds, the homogametic sex is male (ZZ) and the heterogametic sex is female (ZW). Two hypotheses have been proposed for the mechanism of avian sex determination. The W (female) chromosome may carry a dominant-acting ovary determinant. Alternatively, the dosage of a Z-linked gene may mediate sex determination, two doses being required for male development (ZZ). A strong candidate avian sex-determinant under the dosage hypothesis is the conserved Z-linked gene, DMRT1 (doublesex and mab-3-related transcription factor 1). Here we used RNA interference (RNAi) to knock down DMRT1 in early chicken embryos. Reduction of DMRT1 protein expression in ovo leads to feminization of the embryonic gonads in genetically male (ZZ) embryos. Affected males show partial sex reversal, characterized by feminization of the gonads. The feminized left gonad shows female-like histology, disorganized testis cords and a decline in the testicular marker, SOX9. The ovarian marker, aromatase, is ectopically activated. The feminized right gonad shows a more variable loss of DMRT1 and ectopic aromatase activation, suggesting differential sensitivity to DMRT1 between left and right gonads. Germ cells also show a female pattern of distribution in the feminized male gonads. These results indicate that DMRT1 is required for testis determination in the chicken. Our data support the Z dosage hypothesis for avian sex determination.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, Craig A -- Roeszler, Kelly N -- Ohnesorg, Thomas -- Cummins, David M -- Farlie, Peter G -- Doran, Timothy J -- Sinclair, Andrew H -- England -- Nature. 2009 Sep 10;461(7261):267-71. doi: 10.1038/nature08298. Epub 2009 Aug 26.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Murdoch Children's Research Institute and Department of Paediatrics, The University of Melbourne, Royal Children's Hospital, Melbourne, Victoria 3052, Australia. craig.smith@mcri.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19710650" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biomarkers/analysis ; Cell Line ; Chick Embryo ; Chickens/*genetics/*physiology ; Disorders of Sex Development ; Down-Regulation ; Female ; Gene Dosage/genetics ; Male ; MicroRNAs/genetics/metabolism ; Models, Genetic ; Ovary/embryology/metabolism ; RNA Interference ; SOX9 Transcription Factor/genetics/metabolism ; *Sex Characteristics ; Sex Chromosomes/*genetics ; *Sex Determination Processes ; Testis/embryology/metabolism ; Transcription Factors/deficiency/*genetics/*metabolism
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  • 4
    Publication Date: 2015-08-11
    Description: The typical response of the adult mammalian pulmonary circulation to a low oxygen environment is vasoconstriction and structural remodelling of pulmonary arterioles, leading to chronic elevation of pulmonary artery pressure (pulmonary hypertension) and right ventricular hypertrophy. Some mammals, however, exhibit genetic resistance to hypoxia-induced pulmonary hypertension. We used a congenic breeding program and comparative genomics to exploit this variation in the rat and identified the gene Slc39a12 as a major regulator of hypoxia-induced pulmonary vascular remodelling. Slc39a12 encodes the zinc transporter ZIP12. Here we report that ZIP12 expression is increased in many cell types, including endothelial, smooth muscle and interstitial cells, in the remodelled pulmonary arterioles of rats, cows and humans susceptible to hypoxia-induced pulmonary hypertension. We show that ZIP12 expression in pulmonary vascular smooth muscle cells is hypoxia dependent and that targeted inhibition of ZIP12 inhibits the rise in intracellular labile zinc in hypoxia-exposed pulmonary vascular smooth muscle cells and their proliferation in culture. We demonstrate that genetic disruption of ZIP12 expression attenuates the development of pulmonary hypertension in rats housed in a hypoxic atmosphere. This new and unexpected insight into the fundamental role of a zinc transporter in mammalian pulmonary vascular homeostasis suggests a new drug target for the pharmacological management of pulmonary hypertension.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhao, Lan -- Oliver, Eduardo -- Maratou, Klio -- Atanur, Santosh S -- Dubois, Olivier D -- Cotroneo, Emanuele -- Chen, Chien-Nien -- Wang, Lei -- Arce, Cristina -- Chabosseau, Pauline L -- Ponsa-Cobas, Joan -- Frid, Maria G -- Moyon, Benjamin -- Webster, Zoe -- Aldashev, Almaz -- Ferrer, Jorge -- Rutter, Guy A -- Stenmark, Kurt R -- Aitman, Timothy J -- Wilkins, Martin R -- 098424/Wellcome Trust/United Kingdom -- 101033/Wellcome Trust/United Kingdom -- MR/J0003042/1/Medical Research Council/United Kingdom -- P01 HL014985/HL/NHLBI NIH HHS/ -- PG/04/035/16912/British Heart Foundation/United Kingdom -- PG/10/59/28478/British Heart Foundation/United Kingdom -- PG/12/61/29818/British Heart Foundation/United Kingdom -- PG/2000137/British Heart Foundation/United Kingdom -- PG/95170/British Heart Foundation/United Kingdom -- PG/98018/British Heart Foundation/United Kingdom -- RG/10/16/28575/British Heart Foundation/United Kingdom -- WT098424AIA/Wellcome Trust/United Kingdom -- England -- Nature. 2015 Aug 20;524(7565):356-60. doi: 10.1038/nature14620. Epub 2015 Aug 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Pharmacology and Therapeutics, Division of Experimental Medicine, Imperial College London, Hammersmith Hospital, London W12 0NN, UK. ; Physiological Genomics and Medicine Group, Medical Research Council Clinical Sciences Centre, Hammersmith Hospital, London W12 0NN, UK. ; Section of Epigenomics and Disease, Department of Medicine, Faculty of Medicine, Imperial College London, Hammersmith Hospital, London W12 0NN, UK. ; Department of Pediatrics and Medicine, Division of Critical Care Medicine and Cardiovascular Pulmonary Research Laboratories, University of Colorado Denver, Denver, Colorado 80045, USA. ; Transgenics and Embryonic Stem Cell Laboratory, Medical Research Council Clinical Sciences Centre, Hammersmith Hospital, London W12 0NN, UK. ; Institute of Molecular Biology and Medicine, 3 Togolok Moldo Street, Bishkek 720040, Kyrgyzstan. ; Section of Cell Biology and Functional Genomics, Division of Diabetes, Endocrinology and Metabolism, Imperial College London, Hammersmith Hospital, London W12 0NN, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26258299" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Congenic ; Anoxia/genetics/*metabolism ; Arterioles/metabolism ; Cation Transport Proteins/deficiency/genetics/*metabolism ; Cattle ; Cell Hypoxia ; Cell Proliferation ; Cells, Cultured ; Chromosomes, Mammalian/genetics ; Chronic Disease ; Female ; Gene Knockdown Techniques ; Homeostasis ; Humans ; Hypertension, Pulmonary/genetics/*metabolism ; Intracellular Space/metabolism ; Male ; Muscle, Smooth, Vascular/cytology/*metabolism ; Rats ; Rats, Inbred F344 ; Rats, Inbred WKY ; Zinc/metabolism
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  • 5
    Publication Date: 2015-06-02
    Description: Understanding the diversity of human tissues is fundamental to disease and requires linking genetic information, which is identical in most of an individual's cells, with epigenetic mechanisms that could have tissue-specific roles. Surveys of DNA methylation in human tissues have established a complex landscape including both tissue-specific and invariant methylation patterns. Here we report high coverage methylomes that catalogue cytosine methylation in all contexts for the major human organ systems, integrated with matched transcriptomes and genomic sequence. By combining these diverse data types with each individuals' phased genome, we identified widespread tissue-specific differential CG methylation (mCG), partially methylated domains, allele-specific methylation and transcription, and the unexpected presence of non-CG methylation (mCH) in almost all human tissues. mCH correlated with tissue-specific functions, and using this mark, we made novel predictions of genes that escape X-chromosome inactivation in specific tissues. Overall, DNA methylation in several genomic contexts varies substantially among human tissues.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4499021/" 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/PMC4499021/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schultz, Matthew D -- He, Yupeng -- Whitaker, John W -- Hariharan, Manoj -- Mukamel, Eran A -- Leung, Danny -- Rajagopal, Nisha -- Nery, Joseph R -- Urich, Mark A -- Chen, Huaming -- Lin, Shin -- Lin, Yiing -- Jung, Inkyung -- Schmitt, Anthony D -- Selvaraj, Siddarth -- Ren, Bing -- Sejnowski, Terrence J -- Wang, Wei -- Ecker, Joseph R -- F32 HL110473/HL/NHLBI NIH HHS/ -- F32HL110473/HL/NHLBI NIH HHS/ -- K99 HL119617/HL/NHLBI NIH HHS/ -- K99 NS080911/NS/NINDS NIH HHS/ -- K99HL119617/HL/NHLBI NIH HHS/ -- R00 NS080911/NS/NINDS NIH HHS/ -- R00NS080911/NS/NINDS NIH HHS/ -- R01 ES024984/ES/NIEHS NIH HHS/ -- T32 GM008666/GM/NIGMS NIH HHS/ -- U01 ES017166/ES/NIEHS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2015 Jul 9;523(7559):212-6. doi: 10.1038/nature14465. Epub 2015 Jun 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Bioinformatics Program, University of California, San Diego, La Jolla, California 92093, USA [2] Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA. ; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA. ; Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA. ; 1] Computational Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA [2] Department of Cognitive Science, University of California, San Diego, La Jolla, California 92037, USA. ; Ludwig Institute for Cancer Research, La Jolla, California 92093, USA. ; Department of Genetics, Stanford University, 300 Pasteur Drive, M-344 Stanford, California 94305, USA. ; Department of Surgery, Washington University School of Medicine, 660 South Euclid Avenue, Campus Box 8109, St Louis, Missouri 63110, USA. ; Bioinformatics Program, University of California, San Diego, La Jolla, California 92093, USA. ; 1] Ludwig Institute for Cancer Research, La Jolla, California 92093, USA [2] University of California, San Diego School of Medicine, Department of Cellular and Molecular Medicine, Institute of Genomic Medicine, La Jolla, California 92093, USA. ; 1] Computational Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA [2] Division of Biological Sciences, University of California at San Diego, La Jolla, California 92037, USA [3] Howard Hughes Medical Institute, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037, USA. ; 1] Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA [2] Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California 92093, USA. ; 1] Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA [2] Howard Hughes Medical Institute, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26030523" target="_blank"〉PubMed〈/a〉
    Keywords: Age Factors ; Alleles ; Chromosome Mapping ; *DNA Methylation ; *Epigenesis, Genetic ; Female ; Gene Expression Profiling ; Gene Expression Regulation ; Genetic Variation ; Humans ; Male ; Organ Specificity
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  • 6
    Publication Date: 2015-11-05
    Description: Anxiety-related conditions are among the most difficult neuropsychiatric diseases to treat pharmacologically, but respond to cognitive therapies. There has therefore been interest in identifying relevant top-down pathways from cognitive control regions in medial prefrontal cortex (mPFC). Identification of such pathways could contribute to our understanding of the cognitive regulation of affect, and provide pathways for intervention. Previous studies have suggested that dorsal and ventral mPFC subregions exert opposing effects on fear, as do subregions of other structures. However, precise causal targets for top-down connections among these diverse possibilities have not been established. Here we show that the basomedial amygdala (BMA) represents the major target of ventral mPFC in amygdala in mice. Moreover, BMA neurons differentiate safe and aversive environments, and BMA activation decreases fear-related freezing and high-anxiety states. Lastly, we show that the ventral mPFC-BMA projection implements top-down control of anxiety state and learned freezing, both at baseline and in stress-induced anxiety, defining a broadly relevant new top-down behavioural regulation pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Adhikari, Avishek -- Lerner, Talia N -- Finkelstein, Joel -- Pak, Sally -- Jennings, Joshua H -- Davidson, Thomas J -- Ferenczi, Emily -- Gunaydin, Lisa A -- Mirzabekov, Julie J -- Ye, Li -- Kim, Sung-Yon -- Lei, Anna -- Deisseroth, Karl -- 1F32MH105053-01/MH/NIMH NIH HHS/ -- K99 MH106649/MH/NIMH NIH HHS/ -- K99MH106649/MH/NIMH NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2015 Nov 12;527(7577):179-85. doi: 10.1038/nature15698. Epub 2015 Nov 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bioengineering, Stanford University, Stanford, California 94305, USA. ; CNC Program, Stanford University, Stanford, California 94304, USA. ; Neurosciences Program, Stanford University, Stanford, California 94305, USA. ; Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California 94305, USA. ; Howard Hughes Medical Institute, Stanford University, Stanford, California 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26536109" target="_blank"〉PubMed〈/a〉
    Keywords: Amygdala/cytology/*physiology ; Animals ; Anxiety/*physiopathology/psychology ; Extinction, Psychological/physiology ; Fear/*physiology/psychology ; Female ; Freezing Reaction, Cataleptic/physiology ; Learning/physiology ; Male ; Mice ; Mice, Inbred C57BL ; Neural Pathways/*physiology ; Prefrontal Cortex/cytology/physiology ; Stress, Psychological/physiopathology
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  • 7
    Publication Date: 2012-03-01
    Description: The human X and Y chromosomes evolved from an ordinary pair of autosomes during the past 200-300 million years. The human MSY (male-specific region of Y chromosome) retains only three percent of the ancestral autosomes' genes owing to genetic decay. This evolutionary decay was driven by a series of five 'stratification' events. Each event suppressed X-Y crossing over within a chromosome segment or 'stratum', incorporated that segment into the MSY and subjected its genes to the erosive forces that attend the absence of crossing over. The last of these events occurred 30 million years ago, 5 million years before the human and Old World monkey lineages diverged. Although speculation abounds regarding ongoing decay and looming extinction of the human Y chromosome, remarkably little is known about how many MSY genes were lost in the human lineage in the 25 million years that have followed its separation from the Old World monkey lineage. To investigate this question, we sequenced the MSY of the rhesus macaque, an Old World monkey, and compared it to the human MSY. We discovered that during the last 25 million years MSY gene loss in the human lineage was limited to the youngest stratum (stratum 5), which comprises three percent of the human MSY. In the older strata, which collectively comprise the bulk of the human MSY, gene loss evidently ceased more than 25 million years ago. Likewise, the rhesus MSY has not lost any older genes (from strata 1-4) during the past 25 million years, despite its major structural differences to the human MSY. The rhesus MSY is simpler, with few amplified gene families or palindromes that might enable intrachromosomal recombination and repair. We present an empirical reconstruction of human MSY evolution in which each stratum transitioned from rapid, exponential loss of ancestral genes to strict conservation through purifying selection.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3292678/" 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/PMC3292678/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hughes, Jennifer F -- Skaletsky, Helen -- Brown, Laura G -- Pyntikova, Tatyana -- Graves, Tina -- Fulton, Robert S -- Dugan, Shannon -- Ding, Yan -- Buhay, Christian J -- Kremitzki, Colin -- Wang, Qiaoyan -- Shen, Hua -- Holder, Michael -- Villasana, Donna -- Nazareth, Lynne V -- Cree, Andrew -- Courtney, Laura -- Veizer, Joelle -- Kotkiewicz, Holland -- Cho, Ting-Jan -- Koutseva, Natalia -- Rozen, Steve -- Muzny, Donna M -- Warren, Wesley C -- Gibbs, Richard A -- Wilson, Richard K -- Page, David C -- R01 HG000257/HG/NHGRI NIH HHS/ -- R01 HG000257-17/HG/NHGRI NIH HHS/ -- U54 HG003273/HG/NHGRI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2012 Feb 22;483(7387):82-6. doi: 10.1038/nature10843.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Biology, Massachusetts Institute of Technology, 9 Cambridge Center, Cambridge, Massachusetts 02142, USA. jhughes@wi.mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22367542" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chromosomes, Human, Y/*genetics ; Conserved Sequence/*genetics ; Crossing Over, Genetic/genetics ; *Evolution, Molecular ; Gene Amplification/genetics ; *Gene Deletion ; Humans ; In Situ Hybridization, Fluorescence ; Macaca mulatta/*genetics ; Male ; Models, Genetic ; Molecular Sequence Data ; Pan troglodytes/genetics ; Radiation Hybrid Mapping ; Selection, Genetic/genetics ; Time Factors ; Y Chromosome/*genetics
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  • 8
    Publication Date: 2014-02-07
    Description: Alveoli are gas-exchange sacs lined by squamous alveolar type (AT) 1 cells and cuboidal, surfactant-secreting AT2 cells. Classical studies suggested that AT1 arise from AT2 cells, but recent studies propose other sources. Here we use molecular markers, lineage tracing and clonal analysis to map alveolar progenitors throughout the mouse lifespan. We show that, during development, AT1 and AT2 cells arise directly from a bipotent progenitor, whereas after birth new AT1 cells derive from rare, self-renewing, long-lived, mature AT2 cells that produce slowly expanding clonal foci of alveolar renewal. This stem-cell function is broadly activated by AT1 injury, and AT2 self-renewal is selectively induced by EGFR (epidermal growth factor receptor) ligands in vitro and oncogenic Kras(G12D) in vivo, efficiently generating multifocal, clonal adenomas. Thus, there is a switch after birth, when AT2 cells function as stem cells that contribute to alveolar renewal, repair and cancer. We propose that local signals regulate AT2 stem-cell activity: a signal transduced by EGFR-KRAS controls self-renewal and is hijacked during oncogenesis, whereas another signal controls reprogramming to AT1 fate.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4013278/" 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/PMC4013278/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Desai, Tushar J -- Brownfield, Douglas G -- Krasnow, Mark A -- P30 CA124435/CA/NCI NIH HHS/ -- U01 HL099995/HL/NHLBI NIH HHS/ -- U01 HL099999/HL/NHLBI NIH HHS/ -- England -- Nature. 2014 Mar 13;507(7491):190-4. doi: 10.1038/nature12930. Epub 2014 Feb 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Department of Biochemistry and Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305-5307, USA [2] Department of Internal Medicine, Division of Pulmonary and Critical Care, Stanford University School of Medicine, Stanford, California 94305-5307, USA. ; Department of Biochemistry and Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305-5307, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24499815" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Differentiation ; Cell Division ; Cell Lineage ; Cell Transformation, Neoplastic/metabolism/pathology ; Cells, Cultured ; Cellular Reprogramming ; Clone Cells/cytology ; Female ; Lung/*cytology/embryology/*growth & development/pathology ; Lung Neoplasms/metabolism/*pathology ; Male ; Mice ; Models, Biological ; Multipotent Stem Cells/*cytology/metabolism/*pathology ; Proto-Oncogene Proteins p21(ras)/genetics/metabolism ; Pulmonary Alveoli/*cytology ; Receptor, Epidermal Growth Factor/metabolism ; *Regeneration ; Signal Transduction
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2015-11-10
    Description: At least 120 non-olfactory G-protein-coupled receptors in the human genome are 'orphans' for which endogenous ligands are unknown, and many have no selective ligands, hindering the determination of their biological functions and clinical relevance. Among these is GPR68, a proton receptor that lacks small molecule modulators for probing its biology. Using yeast-based screens against GPR68, here we identify the benzodiazepine drug lorazepam as a non-selective GPR68 positive allosteric modulator. More than 3,000 GPR68 homology models were refined to recognize lorazepam in a putative allosteric site. Docking 3.1 million molecules predicted new GPR68 modulators, many of which were confirmed in functional assays. One potent GPR68 modulator, ogerin, suppressed recall in fear conditioning in wild-type but not in GPR68-knockout mice. The same approach led to the discovery of allosteric agonists and negative allosteric modulators for GPR65. Combining physical and structure-based screening may be broadly useful for ligand discovery for understudied and orphan GPCRs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huang, Xi-Ping -- Karpiak, Joel -- Kroeze, Wesley K -- Zhu, Hu -- Chen, Xin -- Moy, Sheryl S -- Saddoris, Kara A -- Nikolova, Viktoriya D -- Farrell, Martilias S -- Wang, Sheng -- Mangano, Thomas J -- Deshpande, Deepak A -- Jiang, Alice -- Penn, Raymond B -- Jin, Jian -- Koller, Beverly H -- Kenakin, Terry -- Shoichet, Brian K -- Roth, Bryan L -- GM59957/GM/NIGMS NIH HHS/ -- GM71896/GM/NIGMS NIH HHS/ -- P01 HL114471/HL/NHLBI NIH HHS/ -- R01 DA017204/DA/NIDA NIH HHS/ -- R01 DA027170/DA/NIDA NIH HHS/ -- U01 MH104974/MH/NIMH NIH HHS/ -- U19MH082441/MH/NIMH NIH HHS/ -- U54 HD079124/HD/NICHD NIH HHS/ -- England -- Nature. 2015 Nov 26;527(7579):477-83. doi: 10.1038/nature15699. Epub 2015 Nov 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599-7365, USA. ; National Institute of Mental Health Psychoactive Drug Screening Program (NIMH PDSP), School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7365, USA. ; Department of Pharmaceutical Chemistry, University of California at San Francisco, Byers Hall, 1700 4th Street, San Francisco, California 94158-2550, USA. ; Center for Integrative Chemical Biology and Drug Discovery (CICBDD), University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7363, USA. ; Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7360, USA. ; Department of Psychiatry and Carolina Institute for Developmental Disabilities (CIDD), University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7146, USA. ; Center for Translational Medicine and Department of Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA. ; Department of Genetics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7264, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26550826" target="_blank"〉PubMed〈/a〉
    Keywords: Allosteric Regulation/drug effects ; Allosteric Site ; Animals ; Anti-Anxiety Agents/analysis/chemistry/metabolism/pharmacology ; Benzyl Alcohols/analysis/*chemistry/metabolism/*pharmacology ; Conditioning, Classical ; *Drug Discovery ; Fear ; Female ; HEK293 Cells ; Humans ; Ligands ; Lorazepam/analysis/*chemistry/metabolism/*pharmacology ; Male ; Memory/drug effects ; Mice ; Mice, Knockout ; Models, Molecular ; Receptors, G-Protein-Coupled/agonists/antagonists & ; inhibitors/chemistry/deficiency/*metabolism ; Signal Transduction/drug effects ; Triazines/analysis/*chemistry/metabolism/*pharmacology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2011-01-21
    Description: Cutaneous malignant melanoma is a highly aggressive and frequently chemoresistant cancer, the incidence of which continues to rise. Epidemiological studies show that the major aetiological melanoma risk factor is ultraviolet (UV) solar radiation, with the highest risk associated with intermittent burning doses, especially during childhood. We have experimentally validated these epidemiological findings using the hepatocyte growth factor/scatter factor transgenic mouse model, which develops lesions in stages highly reminiscent of human melanoma with respect to biological, genetic and aetiological criteria, but only when irradiated as neonatal pups with UVB, not UVA. However, the mechanisms underlying UVB-initiated, neonatal-specific melanomagenesis remain largely unknown. Here we introduce a mouse model permitting fluorescence-aided melanocyte imaging and isolation following in vivo UV irradiation. We use expression profiling to show that activated neonatal skin melanocytes isolated following a melanomagenic UVB dose bear a distinct, persistent interferon response signature, including genes associated with immunoevasion. UVB-induced melanocyte activation, characterized by aberrant growth and migration, was abolished by antibody-mediated systemic blockade of interferon-gamma (IFN-gamma), but not type-I interferons. IFN-gamma was produced by macrophages recruited to neonatal skin by UVB-induced ligands to the chemokine receptor Ccr2. Admixed recruited skin macrophages enhanced transplanted melanoma growth by inhibiting apoptosis; notably, IFN-gamma blockade abolished macrophage-enhanced melanoma growth and survival. IFN-gamma-producing macrophages were also identified in 70% of human melanomas examined. Our data reveal an unanticipated role for IFN-gamma in promoting melanocytic cell survival/immunoevasion, identifying a novel candidate therapeutic target for a subset of melanoma patients.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3140101/" 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/PMC3140101/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zaidi, M Raza -- Davis, Sean -- Noonan, Frances P -- Graff-Cherry, Cari -- Hawley, Teresa S -- Walker, Robert L -- Feigenbaum, Lionel -- Fuchs, Elaine -- Lyakh, Lyudmila -- Young, Howard A -- Hornyak, Thomas J -- Arnheiter, Heinz -- Trinchieri, Giorgio -- Meltzer, Paul S -- De Fabo, Edward C -- Merlino, Glenn -- CA53765/CA/NCI NIH HHS/ -- CA92258/CA/NCI NIH HHS/ -- R01 CA053765-10S1/CA/NCI NIH HHS/ -- R01 CA092258-05/CA/NCI NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2011 Jan 27;469(7331):548-53. doi: 10.1038/nature09666. Epub 2011 Jan 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cancer Biology and Genetics, National Cancer Institute, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21248750" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Disease Models, Animal ; Female ; Gene Expression Profiling ; Gene Expression Regulation, Developmental/radiation effects ; Humans ; Interferon-gamma/*metabolism ; Macrophages/metabolism/radiation effects ; Male ; Melanocytes/*metabolism/radiation effects ; Melanoma/*physiopathology ; Mice ; *Ultraviolet Rays
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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