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- W1513463586 abstract "Resistance of primary cells to transformation by oncogenic Ras has been attributed to the induction of replicative growth arrest. This irreversible 'fail-safe mechanism' resembles senescence and requires induction by Ras of p19ARF and p53 (refs 3-5). Mutation of either p19ARF or p53 alleviates Ras-induced senescence and facilitates oncogenic transformation by Ras. Here we report that, whereas Rb and p107 are each dispensable for Ras-induced replicative arrest, simultaneous ablation of both genes disrupts Ras-induced senescence and results in unrestrained proliferation. This occurs despite activation by Ras of the p19ARF /p53 pathway, identifying pRb and p107 as essential mediators of Ras-induced antiproliferative p19ARF/p53 signalling. Unexpectedly, in contrast to p19ARF or p53 deficiency, loss of Rb/p107 function does not result in oncogenic transformation by Ras, as Ras-expressing Rb-/-/p107-/- fibroblasts fail to grow anchorage-independently in vitro and are not tumorigenic in vivo. These results demonstrate that in the absence of both Rb and p107 cells are resistant to p19ARF/p53-dependent protection against Ras-induced proliferation, and uncouple escape from Ras-induced premature senescence from oncogenic transformation." @default.
- W1513463586 created "2016-06-24" @default.
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- W1513463586 date "2001-01-18" @default.
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- W1513463586 title "Escape from premature senescence is not sufficient for oncogenic transformation by Ras" @default.
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- W1513463586 doi "https://doi.org/10.1038/35055110" @default.
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