<正>Rationale Inactivation of the p66Shc adaptor protein confers resistance to oxidative stress and protects mice from aging - associated vascular ***,there is limited information about the negatively regulating mec...
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<正>Rationale Inactivation of the p66Shc adaptor protein confers resistance to oxidative stress and protects mice from aging - associated vascular ***,there is limited information about the negatively regulating mechanisms of p66Shc expression in the vascular *** In this study,we investigated the role of SIRT1,a classⅢhistone deacetylase,in the regulation of p66Shc expression and hyperglycemia -induced endothelial *** and Results Expressions of p66Shc gene transcript and protein were significantly increased by different kinds of ClassⅢhistone deacetylase(sirtuin) inhibitors in human umbilical vein endothelial cells(HUVECs) and 293A *** overexpression of SIRT1 inhibited high glucose - induced p66Shc upregulation in *** of SIRT1 increased p66Shc expression in high glucose conditions,and also increased the expression levels of plasminogen activator inhibitor 1 (PAI-1) expression,but decreased manganese superoxide dismutase(MnSOD) ***, knockdown of p66Shc significantly reversed the effects of SIRT1 knockdown under high glucose conditions in ***,compared to streptozotocin - induced wild - type diabetic mice,endothelium - specific SIRT1 transgenic(SIRT1 -Tg) diabetic mice had decreased p66Shc expression at both the mRNA and the protein levels,improved endothelial function and reduced accumulation of nitrotyrosine and 8 - OHdG(markers of oxidative stress).We further found that SIRT1 was able to bind to the p66Shc promoter,resulting in a decrease in the acetylation of histone H3 bound to the p66Shc promoter *** Our findings indicate that repression of p66Shc expression by SIRT1 contributes to the protection of hyperglycemia - induced endothelial dysfunction.
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