Abstract
c-Abl is a proto-oncogene that is essential for mouse development and tissue homeostasis. Misregulation of c-Abl, as seen in the constitutively active BCR-ABL, is the leading cause of human chronic myeloid leukemia. However, how the Abl proteins execute their functions still remains largely unknown. Here, we report an important role for c-Abl in replicative senescence and immortalization by regulating the expression of two tumor suppressors that induce cellular senescence, p53 and p16INK4a. Using primary mouse embryonic fibroblasts (MEFs), we show that c-Abl −/− cells were more resistant to immortalization than wildtype cells using a standard 3T3 or 3T9 protocol. We could only immortalize three out of nine c-Abl −/− MEF cultures even when we increased the number of starting cells. This resistance was attributed to premature senescence and reduced survival in senescent c-Abl −/− cells due to an increase in p16INK4a and p53 expression. Deleting p53 allows c-Abl −/− p53 −/− MEFs to bypass senescence to be spontaneously immortalized. Cell immortalization, but not senescence, was generally accompanied by mutations in p53 in both wildtype and c-Abl −/− MEFs, although the spectrum is different from that of human tumors. The role for c-Abl in regulating cell senescence and immortalization might explain some of the developmental defects in c-Abl −/− mice and how BCR-ABL transforms cells.
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Acknowledgements
We would like to thank Ian Hang In and Terence Cheng for technical assistance. This work was supported by grants from the Ministry of Science and Technology of China (The National Key Scientific Program (2012CB966901, to B. L.) and 863 program (2011AA02A111)), the National Natural Science Foundation of China (81130039, 31071229, and 81121001), Shanghai Pujiang Program (10PJ1405000), Cheung Kong Scholars Program of the Ministry of Education, and Agency for Science, Technology and Research of Singapore.
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Man Zhang and Lili Li contributed equally to this work.
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Zhang, M., Li, L., Wang, Z. et al. A role for c-Abl in cell senescence and spontaneous immortalization. AGE 35, 1251–1262 (2013). https://doi.org/10.1007/s11357-012-9452-4
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DOI: https://doi.org/10.1007/s11357-012-9452-4