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- W2168441639 abstract "ABSTRACT Although oncogenic Ras commonly contributes to the development of cancer, in normal primary cells it induces cell cycle arrest rather than transformation. Here we analyze the additional genetic changes required for Ras to promote cell cycle progression rather than arrest. We show that loss of p53 is sufficient for oncogenic Ras to stimulate proliferation in the absence of extrinsic mitogens in attached cells. However, surprisingly, we find that p53 loss is not sufficient for Ras to overcome anchorage dependence or contact inhibition. In contrast, expression of simian virus 40 (SV40) large T antigen (LT) allows Ras to overcome these additional cell cycle controls. Mutational analysis of SV40 LT shows that this action of SV40 LT depends on its ability to inactivate the retinoblastoma (Rb) family of proteins, in concert with the loss of p53. Importantly, we show that inactivation of the Rb family of proteins can be mimicked by loss of the cyclin-dependent kinase inhibitor p16 INK4A . p16 INK4A is commonly lost in human tumors, but its contribution to the transformed phenotype is unknown. We demonstrate here a role for p16 INK4A in the loss of cell cycle controls required for tumorigenesis and show how accumulating genetic changes cooperate and contribute to the transformed phenotype." @default.
- W2168441639 created "2016-06-24" @default.
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- W2168441639 date "2003-04-01" @default.
- W2168441639 modified "2023-09-25" @default.
- W2168441639 title "Dissecting the Contribution of p16 INK4A and the Rb Family to the Ras Transformed Phenotype" @default.
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- W2168441639 doi "https://doi.org/10.1128/mcb.23.7.2530-2542.2003" @default.
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