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• W2099135369 abstract "Apoptosis of VSMCs (vascular smooth-muscle cells) leads to features of atherosclerotic plaque instability. We have demonstrated previously that plaque-derived VSMCs have reduced IGF1 (insulin-like growth factor 1) signalling, resulting from a decrease in the expression of IGF1R (IGF1 receptor) compared with normal aortic VSMCs [Patel, Zhang, Siddle, Soos, Goddard, Weissberg and Bennett (2001) Circ. Res. 88, 895-902]. In the present study, we show that apoptosis induced by oxidative stress is inhibited by ectopic expression of IGF1R. Oxidative stress repressed IGF1R expression at multiple levels, and this was also blocked by mutant p53. Oxidative stress also induced p53 phosphorylation and apoptosis in VSMCs. p53 negatively regulated IGF1R promoter activity and expression and, consistent with this, p53-/- VSMCs demonstrated increased IGF1R expression, both in vitro and in advanced atherosclerotic plaques in vivo. Oxidative-stress-induced interaction of endogenous p53 with TBP (TATA-box-binding protein) was dependent on p53 phosphorylation. Oxidative stress also increased the association of p53 with HDAC1 (histone deacetylase 1). Trichostatin A, a specific HDAC inhibitor, or p300 overexpression relieved the repression of IGF1R following oxidative stress. Furthermore, acetylated histone-4 association with the IGF1R promoter was reduced in cells subjected to oxidative stress. These results suggest that oxidative-stress-induced repression of IGF1R is mediated by the association of phosphorylated p53 with the IGF1R promoter via TBP, and by the subsequent recruitment of chromatin-modifying proteins, such as HDAC1, to the IGF1R promoter-TBP-p53 complex." @default.
• W2099135369 created "2016-06-24" @default.
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• W2099135369 date "2007-09-12" @default.
• W2099135369 modified "2023-10-14" @default.
• W2099135369 title "Oxidative stress regulates IGF1R expression in vascular smooth-muscle cells via p53 and HDAC recruitment" @default.
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• W2099135369 doi "https://doi.org/10.1042/bj20070380" @default.
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