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- W2004782456 abstract "Abstract —Using an in vitro model of a conditionally immortalized cell line, we investigated how human vascular smooth muscle cells (VSMCs) are affected by the expression of simian virus 40 (SV40) large T antigen (LT antigen), which binds to cell cycle regulators, such as the tumor suppressor protein p53. Cells were obtained after infection of saphenous vein–derived VSMCs with a nonreplicative retroviral vector containing a temperature-sensitive (ts) mutant of SV40 LT antigen and were shown to have maintained some characteristics and responses of VSMCs. Under permissive temperature conditions (36°C), the increased rate of cell proliferation was shown to be associated with expression of LT antigen and with LT-antigen binding to and inactivation of p53. p53 inactivation failed to block apoptosis induced by serum withdrawal or by UV irradiation. Downregulation of LT-antigen expression at the nonpermissive temperature (39°C) was shown to be associated with growth arrest, increased expression of the cell cycle inhibitor p21 WAF1/CIP1 , increased MDM2-promoter activity, and differential expression of MDM2 gene products, suggesting that p53-induced transcription/transactivation may be involved in VSMC cell cycle control but not necessarily apoptosis. The established SMC line HVTs-SM1 may be a useful model for the study of processes involved in myointimal hyperplasia and cellular aging, as well as for the study of cell cycle control in general." @default.
- W2004782456 created "2016-06-24" @default.
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- W2004782456 date "2000-03-01" @default.
- W2004782456 modified "2023-10-11" @default.
- W2004782456 title "p53, p21 <sup>WAF1/CIP1</sup> , and MDM2 Involvement in Proliferation and Apoptosis in an In Vitro Model of Conditionally Immortalized Human Vascular Smooth Muscle Cells" @default.
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- W2004782456 doi "https://doi.org/10.1161/01.atv.20.3.636" @default.
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