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- W1515685057 abstract "Human carcinoma cell lines are frequently refractory to the antiproliferative effect of the autocrine growth inhibitor transforming growth factor beta 1 (TGF-beta 1) and often express mutant forms of the tumor suppressor gene p53. Therefore, we wished to determine whether mutant p53 affects the cellular response to TGF-beta 1. A murine p53 complementary DNA carrying an activating point mutation was introduced into TGF-beta 1-sensitive BALB/MK mouse epidermal keratinocytes by retroviral infection. Mp53 transformed cells displayed a spindle-type morphology and expressed between 0.02 and 0.7 ng of mutant p53/mg total protein. Furthermore, whereas TGF-beta 1 caused approximately 90% maximal inhibition of DNA synthesis of parental BALB/MK cells, the Mp53 transformants were inhibited by less than 70%. The median inhibiting dose of TGF-beta 1 was 4.07 +/- 1 (SE) pM for BALB/MK cells, but ranged from 2.4 to 11.2 pM and from 11.7 to 40 pM for two different sets of Mp53 transformants, and increased as a function of the amounts of mutant p53 protein that were expressed. Our findings suggest that mutant forms of p53 inhibit the antiproliferative effect of TGF-beta 1 by interfering with its signaling pathway." @default.
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- W1515685057 date "1993-02-15" @default.
- W1515685057 modified "2023-09-23" @default.
- W1515685057 title "Mutant p53 tumor suppressor gene causes resistance to transforming growth factor beta 1 in murine keratinocytes." @default.
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