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  • 1
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    Recent progress in the biology and physiology of sirtuins (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-07-31
    Description: The sirtuins are a highly conserved family of NAD(+)-dependent enzymes that regulate lifespan in lower organisms. Recently, the mammalian sirtuins have been connected to an ever widening circle of activities that encompass cellular stress resistance, genomic stability, tumorigenesis and energy metabolism. Here we review the recent progress in sirtuin biology, the role these proteins have in various age-related diseases and the tantalizing notion that the activity of this family of enzymes somehow regulates how long we live.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3727385/" 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/PMC3727385/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Finkel, Toren -- Deng, Chu-Xia -- Mostoslavsky, Raul -- R01 DK088190/DK/NIDDK NIH HHS/ -- R01 GM093072/GM/NIGMS NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2009 Jul 30;460(7255):587-91. doi: 10.1038/nature08197.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Translational Medicine Branch, National Heart Lung and Blood Institute, US National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19641587" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/physiology ; Animals ; DNA Repair/physiology ; Gene Expression Regulation, Enzymologic ; Humans ; Longevity/physiology ; Sirtuins/metabolism/*physiology ; Stress, Physiological/physiology
    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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  • 2
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    Bmi1 regulates mitochondrial function and the DNA damage response pathway (2009)
    Nature Publishing Group (NPG)
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    Publication Date: 2009-05-01
    Description: Mice deficient in the Polycomb repressor Bmi1 develop numerous abnormalities including a severe defect in stem cell self-renewal, alterations in thymocyte maturation and a shortened lifespan. Previous work has implicated de-repression of the Ink4a/Arf (also known as Cdkn2a) locus as mediating many of the aspects of the Bmi1(-/-) phenotype. Here we demonstrate that cells derived from Bmi1(-/-) mice also have impaired mitochondrial function, a marked increase in the intracellular levels of reactive oxygen species and subsequent engagement of the DNA damage response pathway. Furthermore, many of the deficiencies normally observed in Bmi1(-/-) mice improve after either pharmacological treatment with the antioxidant N-acetylcysteine or genetic disruption of the DNA damage response pathway by Chk2 (also known as Chek2) deletion. These results demonstrate that Bmi1 has an unexpected role in maintaining mitochondrial function and redox homeostasis and indicate that the Polycomb family of proteins can coordinately regulate cellular metabolism with stem and progenitor cell function.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4721521/" 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/PMC4721521/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Jie -- Cao, Liu -- Chen, Jichun -- Song, Shiwei -- Lee, In Hye -- Quijano, Celia -- Liu, Hongjun -- Keyvanfar, Keyvan -- Chen, Haoqian -- Cao, Long-Yue -- Ahn, Bong-Hyun -- Kumar, Neil G -- Rovira, Ilsa I -- Xu, Xiao-Ling -- van Lohuizen, Maarten -- Motoyama, Noboru -- Deng, Chu-Xia -- Finkel, Toren -- R00 AG032356/AG/NIA NIH HHS/ -- Z01 HL005012-11/Intramural NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 May 21;459(7245):387-92. doi: 10.1038/nature08040. Epub 2009 Apr 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Translational Medicine Branch, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19404261" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcysteine/pharmacology ; Animals ; Antioxidants/pharmacology ; Checkpoint Kinase 2 ; *DNA Damage/genetics ; Female ; Male ; Mice ; Mitochondria/*metabolism ; Nuclear Proteins/deficiency/genetics/*metabolism ; Oxidation-Reduction/drug effects ; Polycomb Repressive Complex 1 ; Protein-Serine-Threonine Kinases/deficiency/genetics ; Proto-Oncogene Proteins/deficiency/genetics/*metabolism ; Reactive Oxygen Species/metabolism ; Repressor Proteins/genetics/*metabolism ; Stem Cells/cytology/drug effects/metabolism ; Thymus Gland/cytology/drug effects
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
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    Mitogenic signaling mediated by oxidants in Ras-transformed fibroblasts (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-03-14
    Description: NIH 3T3 fibroblasts stably transformed with a constitutively active isoform of p21(Ras), H-RasV12 (v-H-Ras or EJ-Ras), produced large amounts of the reactive oxygen species superoxide (.O2-). .O2- production was suppressed by the expression of dominant negative isoforms of Ras or Rac1, as well as by treatment with a farnesyltransferase inhibitor or with diphenylene iodonium, a flavoprotein inhibitor. The mitogenic activity of cells expressing H-RasV12 was inhibited by treatment with the chemical antioxidant N-acetyl-L-cysteine. Mitogen-activated protein kinase (MAPK) activity was decreased and c-Jun N-terminal kinase (JNK) was not activated in H-RasV12-transformed cells. Thus, H-RasV12-induced transformation can lead to the production of .O2- through one or more pathways involving a flavoprotein and Rac1. The implication of a reactive oxygen species, probably .O2-, as a mediator of Ras-induced cell cycle progression independent of MAPK and JNK suggests a possible mechanism for the effects of antioxidants against Ras-induced cellular transformation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Irani, K -- Xia, Y -- Zweier, J L -- Sollott, S J -- Der, C J -- Fearon, E R -- Sundaresan, M -- Finkel, T -- Goldschmidt-Clermont, P J -- HL52315/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1997 Mar 14;275(5306):1649-52.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9054359" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Acetylcysteine/pharmacology ; Animals ; Antioxidants/pharmacology ; Calcium-Calmodulin-Dependent Protein Kinases/metabolism ; *Cell Cycle ; Cell Line, Transformed ; *Cell Transformation, Neoplastic ; DNA/biosynthesis ; Electron Spin Resonance Spectroscopy ; GTP-Binding Proteins/metabolism ; *Genes, ras ; JNK Mitogen-Activated Protein Kinases ; Mice ; *Mitogen-Activated Protein Kinases ; Oxidation-Reduction ; Proto-Oncogene Proteins p21(ras)/genetics/*metabolism ; Reactive Oxygen Species/*metabolism ; Signal Transduction ; Superoxides/*metabolism ; Transfection ; rac GTP-Binding Proteins
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Nutrient availability regulates SIRT1 through a forkhead-dependent pathway (2004)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2004-12-18
    Description: Nutrient availability regulates life-span in a wide range of organisms. We demonstrate that in mammalian cells, acute nutrient withdrawal simultaneously augments expression of the SIRT1 deacetylase and activates the Forkhead transcription factor Foxo3a. Knockdown of Foxo3a expression inhibited the starvation-induced increase in SIRT1 expression. Stimulation of SIRT1 transcription by Foxo3a was mediated through two p53 binding sites present in the SIRT1 promoter, and a nutrient-sensitive physical interaction was observed between Foxo3a and p53. SIRT1 expression was not induced in starved p53-deficient mice. Thus, in mammalian cells, p53, Foxo3a, and SIRT1, three proteins separately implicated in aging, constitute a nutrient-sensing pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nemoto, Shino -- Fergusson, Maria M -- Finkel, Toren -- New York, N.Y. -- Science. 2004 Dec 17;306(5704):2105-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cardiovascular Branch, National Heart, Lung, and Blood Institute (NHLBI), Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15604409" target="_blank"〉PubMed〈/a〉
    Keywords: Adipose Tissue/metabolism ; Animals ; Binding Sites ; Culture Media ; Culture Media, Serum-Free ; DNA-Binding Proteins/*metabolism ; Forkhead Transcription Factors ; Gene Deletion ; Genes, p53 ; Glucose ; HeLa Cells ; Humans ; Mice ; Mice, Inbred C57BL ; Mutation ; PC12 Cells ; Promoter Regions, Genetic ; RNA, Small Interfering/pharmacology ; Rats ; Recombinant Fusion Proteins/metabolism ; Recombinant Proteins/metabolism ; Serum ; Sirtuin 1 ; Sirtuins/genetics/*metabolism ; *Starvation ; Transcription Factors/*metabolism ; Transcription, Genetic ; Tumor Suppressor Protein p53/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Redox regulation of forkhead proteins through a p66shc-dependent signaling pathway (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-03-09
    Description: Genetic determinants of longevity include the forkhead-related transcription factor DAF-16 in the worm Caenorhabditis elegans and the p66shc locus in mice. We demonstrate that p66shc regulates intracellular oxidant levels in mammalian cells and that hydrogen peroxide can negatively regulate forkhead activity. In p66shc-/- cells, the activity of the mammalian forkhead homolog FKHRL1 is increased and redox-dependent forkhead inactivation is reduced. In addition, expression of FKHRL1 results in an increase in both hydrogen peroxide scavenging and oxidative stress resistance. These results demonstrate an important functional relation between three distinct elements linked to aging: forkhead proteins, p66shc, and intracellular oxidants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nemoto, Shino -- Finkel, Toren -- New York, N.Y. -- Science. 2002 Mar 29;295(5564):2450-2. Epub 2002 Mar 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cardiovascular Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Building 10/6N-240, 10 Center Drive, Bethesda, MD 20892-1622, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11884717" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcysteine/pharmacology ; *Adaptor Proteins, Signal Transducing ; *Adaptor Proteins, Vesicular Transport ; Animals ; Azoles/pharmacology ; Blood ; Cells, Cultured ; Culture Media ; DNA-Binding Proteins/genetics/*metabolism ; Forkhead Transcription Factors ; Free Radical Scavengers/pharmacology ; Humans ; Hydrogen Peroxide/metabolism/pharmacology ; Mice ; Mutation ; Organoselenium Compounds/pharmacology ; Oxidation-Reduction ; Oxidative Stress ; PC12 Cells ; Phosphorylation ; *Protein-Serine-Threonine Kinases ; Proteins/genetics/*metabolism ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-akt ; Rats ; Reactive Oxygen Species/metabolism ; Shc Signaling Adaptor Proteins ; *Signal Transduction ; Transcription Factors/genetics/*metabolism ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    The NAD-dependent deacetylase SIRT2 is required for programmed necrosis (2012)
    Nature Publishing Group (NPG)
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    Publication Date: 2012-12-04
    Description: Although initially viewed as unregulated, increasing evidence suggests that cellular necrosis often proceeds through a specific molecular program. In particular, death ligands such as tumour necrosis factor (TNF)-alpha activate necrosis by stimulating the formation of a complex containing receptor-interacting protein 1 (RIP1) and receptor-interacting protein 3 (RIP3). Relatively little is known regarding how this complex formation is regulated. Here, we show that the NAD-dependent deacetylase SIRT2 binds constitutively to RIP3 and that deletion or knockdown of SIRT2 prevents formation of the RIP1-RIP3 complex in mice. Furthermore, genetic or pharmacological inhibition of SIRT2 blocks cellular necrosis induced by TNF-alpha. We further demonstrate that RIP1 is a critical target of SIRT2-dependent deacetylation. Using gain- and loss-of-function mutants, we demonstrate that acetylation of RIP1 lysine 530 modulates RIP1-RIP3 complex formation and TNF-alpha-stimulated necrosis. In the setting of ischaemia-reperfusion injury, RIP1 is deacetylated in a SIRT2-dependent fashion. Furthermore, the hearts of Sirt2(-/-) mice, or wild-type mice treated with a specific pharmacological inhibitor of SIRT2, show marked protection from ischaemic injury. Taken together, these results implicate SIRT2 as an important regulator of programmed necrosis and indicate that inhibitors of this deacetylase may constitute a novel approach to protect against necrotic injuries, including ischaemic stroke and myocardial infarction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Narayan, Nisha -- Lee, In Hye -- Borenstein, Ronen -- Sun, Junhui -- Wong, Renee -- Tong, Guang -- Fergusson, Maria M -- Liu, Jie -- Rovira, Ilsa I -- Cheng, Hwei-Ling -- Wang, Guanghui -- Gucek, Marjan -- Lombard, David -- Alt, Fredrick W -- Sack, Michael N -- Murphy, Elizabeth -- Cao, Liu -- Finkel, Toren -- Intramural NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2012 Dec 13;492(7428):199-204. doi: 10.1038/nature11700. Epub 2012 Nov 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Molecular Medicine, National Heart, Lung and Blood Institute, NIH, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23201684" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation ; Animals ; Cell Line ; Female ; HEK293 Cells ; HeLa Cells ; Humans ; Jurkat Cells ; Male ; Mice ; Necrosis/*enzymology ; Nuclear Pore Complex Proteins/metabolism ; Protein Binding ; Receptor-Interacting Protein Serine-Threonine Kinases/metabolism ; Sirtuin 2/*genetics/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    Key tissue targets responsible for anthrax-toxin-induced lethality (2013)
    Nature Publishing Group (NPG)
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    Publication Date: 2013-09-03
    Description: Bacillus anthracis, the causative agent of anthrax disease, is lethal owing to the actions of two exotoxins: anthrax lethal toxin (LT) and oedema toxin (ET). The key tissue targets responsible for the lethal effects of these toxins are unknown. Here we generated cell-type-specific anthrax toxin receptor capillary morphogenesis protein-2 (CMG2)-null mice and cell-type-specific CMG2-expressing mice and challenged them with the toxins. Our results show that lethality induced by LT and ET occurs through damage to distinct cell types; whereas targeting cardiomyocytes and vascular smooth muscle cells is required for LT-induced mortality, ET-induced lethality occurs mainly through its action in hepatocytes. Notably, and in contradiction to what has been previously postulated, targeting of endothelial cells by either toxin does not seem to contribute significantly to lethality. Our findings demonstrate that B. anthracis has evolved to use LT and ET to induce host lethality by coordinately damaging two distinct vital systems.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4080305/" 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/PMC4080305/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Shihui -- Zhang, Yi -- Moayeri, Mahtab -- Liu, Jie -- Crown, Devorah -- Fattah, Rasem J -- Wein, Alexander N -- Yu, Zu-Xi -- Finkel, Toren -- Leppla, Stephen H -- Z99 AI999999/Intramural NIH HHS/ -- ZIA AI001032-06/Intramural NIH HHS/ -- England -- Nature. 2013 Sep 5;501(7465):63-8. doi: 10.1038/nature12510. Epub 2013 Aug 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Microbial Pathogenesis Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. shliu@niaid.nih.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23995686" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anthrax/genetics/metabolism/microbiology ; Antigens, Bacterial/*toxicity ; Bacillus anthracis/*pathogenicity ; Bacterial Toxins/*toxicity ; Disease Resistance/genetics ; Edema/chemically induced ; Endothelial Cells/drug effects ; Epithelial Cells/drug effects/pathology ; Female ; Hepatocytes/drug effects/pathology ; Intestines/drug effects/metabolism/pathology ; Liver/cytology/drug effects/pathology ; Male ; Mice ; Mice, Transgenic ; Muscle, Smooth, Vascular/cytology/drug effects/pathology ; Myocytes, Cardiac/drug effects/pathology ; Organ Specificity/drug effects ; Receptors, Peptide/deficiency/genetics/metabolism ; Substrate Specificity/drug effects ; Survival Analysis
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
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    Requirement for generation of H2O2 for platelet-derived growth factor signal transduction (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-10-13
    Description: Stimulation of rat vascular smooth muscle cells (VSMCs) by platelet-derived growth factor (PDGF) transiently increased the intracellular concentration of hydrogen peroxide (H2O2). This increase could be blunted by increasing the intracellular concentration of the scavenging enzyme catalase or by the chemical antioxidant N-acetylcysteine. The response of VSMCs to PDGF, which includes tyrosine phosphorylation, mitogen-activated protein kinase stimulation, DNA synthesis, and chemotaxis, was inhibited when the growth factor-stimulated rise in H2O2 concentration was blocked. These results suggest that H2O2 may act as a signal-transducing molecule, and they suggest a potential mechanism for the cardioprotective effects of antioxidants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sundaresan, M -- Yu, Z X -- Ferrans, V J -- Irani, K -- Finkel, T -- New York, N.Y. -- Science. 1995 Oct 13;270(5234):296-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cardiology Branch, National Heart, Lung, and Blood Institute (NHLBI), National Institutes of Health (NIH), Bethesda, MD 20892-1650, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7569979" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcysteine/pharmacology ; Adenoviridae/genetics/physiology ; Animals ; Calcium-Calmodulin-Dependent Protein Kinases/metabolism ; Catalase/metabolism ; Cell Line ; Cells, Cultured ; Chemotaxis/drug effects ; Endopeptidase K ; Free Radical Scavengers/pharmacology ; Humans ; Hydrogen Peroxide/*metabolism ; Mitogen-Activated Protein Kinase 1 ; Mitogen-Activated Protein Kinase 3 ; *Mitogen-Activated Protein Kinases ; Muscle, Smooth, Vascular/cytology/drug effects/*metabolism/virology ; Phosphorylation ; Phosphotyrosine/metabolism ; Platelet-Derived Growth Factor/*pharmacology ; Protein-Tyrosine Kinases/metabolism ; Rats ; Serine Endopeptidases/metabolism ; *Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Potential role of human cytomegalovirus and p53 interaction in coronary restenosis (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-07-15
    Description: A subset of patients who have undergone coronary angioplasty develop restenosis, a vessel renarrowing characterized by excessive proliferation of smooth muscle cells (SMCs). Of 60 human restenosis lesions examined, 23 (38 percent) were found to have accumulated high amounts of the tumor suppressor protein p53, and this correlated with the presence of human cytomegalovirus (HCMV) in the lesions. SMCs grown from the lesions expressed HCMV protein IE84 and high amounts of p53. HCMV infection of cultured SMCs enhanced p53 accumulation, which correlated temporally with IE84 expression. IE84 also bound to p53 and abolished its ability to transcriptionally activate a reporter gene. Thus, HCMV, and IE84-mediated inhibition of p53 function, may contribute to the development of restenosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Speir, E -- Modali, R -- Huang, E S -- Leon, M B -- Shawl, F -- Finkel, T -- Epstein, S E -- New York, N.Y. -- Science. 1994 Jul 15;265(5170):391-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cardiology Branch, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8023160" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Aged ; Aged, 80 and over ; *Angioplasty, Balloon ; Antigens, Viral/*metabolism ; Atherectomy, Coronary ; Base Sequence ; Cells, Cultured ; Coronary Disease/*etiology/pathology/therapy ; Coronary Vessels/cytology/metabolism/microbiology ; Cytomegalovirus/*physiology ; Genes, p53 ; Humans ; Immediate-Early Proteins/*metabolism ; Middle Aged ; Molecular Sequence Data ; Muscle, Smooth, Vascular/cytology/metabolism/microbiology ; Recurrence ; Transcriptional Activation ; Transfection ; Tumor Suppressor Protein p53/genetics/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Augmented Wnt signaling in a mammalian model of accelerated aging (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-08-11
    Description: The contribution of stem and progenitor cell dysfunction and depletion in normal aging remains incompletely understood. We explored this concept in the Klotho mouse model of accelerated aging. Analysis of various tissues and organs from young Klotho mice revealed a decrease in stem cell number and an increase in progenitor cell senescence. Because klotho is a secreted protein, we postulated that klotho might interact with other soluble mediators of stem cells. We found that klotho bound to various Wnt family members. In a cell culture model, the Wnt-klotho interaction resulted in the suppression of Wnt biological activity. Tissues and organs from klotho-deficient animals showed evidence of increased Wnt signaling, and ectopic expression of klotho antagonized the activity of endogenous and exogenous Wnt. Both in vitro and in vivo, continuous Wnt exposure triggered accelerated cellular senescence. Thus, klotho appears to be a secreted Wnt antagonist and Wnt proteins have an unexpected role in mammalian aging.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Hongjun -- Fergusson, Maria M -- Castilho, Rogerio M -- Liu, Jie -- Cao, Liu -- Chen, Jichun -- Malide, Daniela -- Rovira, Ilsa I -- Schimel, Daniel -- Kuo, Calvin J -- Gutkind, J Silvio -- Hwang, Paul M -- Finkel, Toren -- 1 R01 DK069989-01/DK/NIDDK NIH HHS/ -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2007 Aug 10;317(5839):803-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cardiology Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17690294" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/*physiology ; Animals ; Apoptosis ; Bone Density ; Bone and Bones/metabolism ; Cell Aging/*physiology ; Cell Count ; Cell Line ; Cell Shape ; Glucuronidase/chemistry/genetics/*metabolism ; Humans ; Mice ; Mice, Transgenic ; Protein Structure, Tertiary ; *Signal Transduction ; Stem Cells/cytology/*physiology ; Wnt Proteins/antagonists & inhibitors/*metabolism ; Wnt1 Protein/metabolism ; Wnt3 Protein
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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