期刊
ONCOGENESIS
卷 1, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/oncsis.2012.7
关键词
CEACAM1; ATM; p53; DNA damage; cellular senescence
类别
资金
- Ligue Genevoise Contre le Cancer
- Fondation pour la Lutte contre le Cancer et pour des Recherches Medico-Biologiques
- Fondation Ritva et Pierre Meyer
The p53 tumor-suppressor protein has a key role in the induction of cellular senescence, an important barrier to cancer development. However, very little is known about the physiological mediators of cellular senescence induced by p53. CEACAM1 is an immunoglobulin superfamily member whose expression is frequently lost in human tumors and exhibits tumor-suppressor features in several experimental systems, including Ceacam1 knockout mice. There is currently little understanding of the pathways and mechanisms by which CEACAM1 exerts its tumor-suppressor function. Here we report that CEACAM1 is strongly upregulated during the cellular response to DNA double-strand breaks (DSBs) starting from the lowest doses of DSB inducers used, and that upregulation is mediated by the ataxia telangiectasia mutated (ATM)/p53 pathway. Stable silencing of CEACAM1 showed that CEACAM1 is required for p53-mediated cellular senescence, but not initial cell growth arrest, in response to DNA damage. These findings identify CEACAM1 as a key component of the ATM/p53-mediated cellular response to DNA damage, and as a tumor suppressor mediating cellular senescence downstream of p53.
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