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• W1966298207 abstract "Malignant melanomas are frequently characterized by elevated levels of wild-type p53, suggesting that p53 function could be suppressed by a mechanism different from p53 mutation. We analysed the functionality of the p53-signaling pathway in a panel of seven human melanoma cell lines consisting of one p53-deficient line, two lines with mutant p53, and four lines expressing wild-type p53. Only lines with wild-type p53 were characterized by elevated levels of endogenous p21, high activity of p53-responsive reporters and accumulation of p53 in response to genotoxic stress, common properties of functional p53. The presence of wild-type p53 was associated with depletion or loss of p14ARF and p16 expression. The levels of p33ING1b and p24ING1c, two major products of Ing1 locus and putative coregulators of p53, were elevated in all cell lines tested; however, ectopic expression of either ING1 isoform had no effect on cell proliferation. All lines retained expression of Apaf-1, and all but one remained sensitive to ectopic expression of retrovirus-transduced p53. Our data indicate that regardless of abnormally high levels of p53 in melanomas, their p53 remains competent in transactivation of its targets, and, if highly overexpressed, capable of growth inhibition. Hence, the p53 pathway in malignant melanomas can be considered for pharmacological targeting and anticancer gene therapy." @default.
• W1966298207 created "2016-06-24" @default.
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• W1966298207 date "2003-07-31" @default.
• W1966298207 modified "2023-10-10" @default.
• W1966298207 title "Melanoma cells can tolerate high levels of transcriptionally active endogenous p53 but are sensitive to retrovirus-transduced p53" @default.
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• W1966298207 doi "https://doi.org/10.1038/sj.onc.1206741" @default.
• W1966298207 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12894234" @default.
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