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  • Original Paper
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The tumor suppressor p16INK4a gene is a regulator of apoptosis induced by ultraviolet light and cisplatin

Abstract

p16INK4a (hereafter referred to as p16), a major cyclin-dependent kinase (CDK) inhibitor, is the product of a tumor-suppressor gene that has been found inactivated in different cancer types. In the present study, we sought to investigate the role of p16 in apoptosis induced by ultraviolet light (the most important etiological cause of skin cancer) and cisplatin (an anticancer DNA damaging agent). It is clearly shown that p16-compromised osteosarcoma U2OS cell line and p16−/− mouse embryo fibroblasts are sensitive to UV-induced apoptosis, as compared to their respective isogenic p16-expressing cells (EH1, EH2) and p16 +/+, indicating that p16 protects cells from undergoing apoptosis in response to UV light. Importantly, this reduction in UV-mediated apoptosis was associated with downregulation of the proapoptotic Bax protein, with no effect on Bcl-2 expression, suggesting that this antiapoptotic role of p16 is mediated via the intrinsic-mitochondrial pathway. On the other hand, p16 sensitized cells to cisplatin-mediated apoptosis through Bcl-2 decline. Interestingly, only proliferating but not G1-arrested EH1 cells underwent apoptosis in response to the anticancer drug. These novel findings provide further insight into the role of p16 in carcinogenesis, and has potential implications for future therapy strategies.

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Acknowledgements

We are very grateful to Dr G Peters for kindly providing U2OS, EH1 and EH2 cell lines. We are also very thankful to Dr NE Sharpless and RA DePinho for providing us with the MEFs. We also thank the research center administration at the KFSHandRC for their continuous support. This work was supported by the King Faisal Specialist Hospital and Research Center, under the RAC proposal # 990025.

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Correspondence to Abdelilah Aboussekhra.

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Al-Mohanna, M., Manogaran, P., Al-Mukhalafi, Z. et al. The tumor suppressor p16INK4a gene is a regulator of apoptosis induced by ultraviolet light and cisplatin. Oncogene 23, 201–212 (2004). https://doi.org/10.1038/sj.onc.1206927

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