Abstract
Resistance of primary cells to transformation by oncogenic Ras has been attributed to the induction of replicative growth arrest1,2,3. 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 Ras3,6,7. 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.
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Acknowledgements
We thank M. Dekker-Vlaar, K. van't Wout and the animal facility (Netherlands Cancer Institute) for help with generating chimaeric mice, isolating and preparing mouse embryos and tumour-induction experiments, J. Jonkers for providing p53−/− MEFs, R. A. DePinho, P. Krimpenfort and J. Jacobs for INK4a−/− MEFs, C. J. Sherr for ARF−/− MEFs, J-W. Voncken, E. Wientjes and E. Verhoeven for Ras and Myc retroviral vectors, G. Nolan for retroviral packaging cells, our colleagues for helpful discussions, and A. Berns for critically reading the manuscript. D.S.P., J-H.D. and S.D. were supported by grants from the Dutch Cancer Society (KWF).
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Peeper, D., Dannenberg, JH., Douma, S. et al. Escape from premature senescence is not sufficient for oncogenic transformation by Ras. Nat Cell Biol 3, 198–203 (2001). https://doi.org/10.1038/35055110
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DOI: https://doi.org/10.1038/35055110
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