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- W4254408317 abstract "The stability of p21WAF1 and p53 is increased by UV radiation or proteasome inhibitors in normal and some tumor cells. However, p21WAF1 can either stimulate in vitro assembly of active cyclin–kinase complexes at low concentrations or inhibit this activity at high concentrations. Also, ectopic p21WAF1 over-expression has been reported to promote or suppress apoptosis, depending on the target cells. We have investigated changes in p21WAF1 expression as a result of exposure to either 25 J/m2 UV or 10 μM MG-115 proteasome inhibitor, both of which cause apoptosis in human C8161 melanoma cells. p21WAF1 mRNA increased in response to UV irradiation but failed to accumulate at the protein level because of its early UV-activated degradation counteracted by proteasome inhibition. UV-mediated loss of p21WAF1 protein preceding induction of p53 and cell death was greater in non-metastatic than in metastatic C8161 melanoma cells. No loss in p21WAF1 occurred with apoptosis induced by 10 μM proteasome inhibitors MG-115 or lactacystin, mediated by over-expression of p21WAF1. Our results suggest that conditions causing prolonged or permanent changes in basal levels of p21WAF1 may impair its reversible cell-cycle checkpoint function, leading to irreversible growth arrest or cell death. Int. J. Cancer 86:462–467, 2000. © 2000 Wiley-Liss, Inc." @default.
- W4254408317 created "2022-05-12" @default.
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- W4254408317 date "2000-05-15" @default.
- W4254408317 modified "2023-10-06" @default.
- W4254408317 title "Apoptosis‐inducing levels of uv radiation and proteasome inhibitors produce opposite effects on p21WAF1 in human melanoma cells" @default.
- W4254408317 doi "https://doi.org/10.1002/(sici)1097-0215(20000515)86:4<462::aid-ijc3>3.3.co;2-2" @default.
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