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- W4321429339 abstract "Codon 273 is one of the hot spots of missense mutation of the p53 tumor suppressor gene found in human cancers. We have previously reported that a mutation at codon 273, p53-273L (Arg→Leu), suppresses cell growth despite its having no p53-specific transactivation activity. To further elucidate the mechanism of growth suppression caused by p53-273L, we used squamous cell carcinoma cell line HSC3 to isolate subclones containing Zn2+-inducible wild-type (wt) p53, p53-175H, and p53-273L. Northern blot hybridization of the HSC3 cells possessing an inducible function of p53 as well as a luciferase assay for the p21Waf1/Cip1/Sdi1 promoter showed that only wt p53 could induce p21Waf1/Cip1/Sdi1 transcription. Meanwhile, the expression of bax remained unchanged between, before, and after the induction of any analyzed p53s. When wt p53 was induced in HSC3 cells cultured in medium containing 5% fetal bovine serum, cell growth was suppressed through G1 arrest. On the other hand, in medium with 0.1% fetal bovine serum, the growth of HSC3 cells expressing p53-273L was suppressed to a greater degree than that of cells expressing wt p53. Flow cytometric analysis and DNA ladder formation revealed that, unlike wt p53-SN3– and p53-175H–expressing HSC3 cells, p53-273L–expressing cells contained a larger sub-G1 fraction under this culture condition. These findings suggest that p53-273L can induce apoptosis in HSC3 cells without transactivation of p21Waf1/Cip1/Sdi1 and bax. Mol. Carcinog. 26:44–52, 1999. © 1999 Wiley-Liss, Inc." @default.
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- W4321429339 date "1999-09-01" @default.
- W4321429339 modified "2023-09-30" @default.
- W4321429339 title "Induction of apoptosis by thep53-273L (Arg?Leu) mutant in HSC3 cells without transactivation ofp21Waf1/Cip1/Sdi1 and bax" @default.
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- W4321429339 doi "https://doi.org/10.1002/(sici)1098-2744(199909)26:1<44::aid-mc6>3.0.co;2-3" @default.
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