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Mol Cell. 2008 Jan 18;29(1):9-22. doi: 10.1016/j.molcel.2007.11.031.

Nuclear FAK promotes cell proliferation and survival through FERM-enhanced p53 degradation.

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  • 1Department of Reproductive Medicine, Moores Cancer Center, University of California, San Diego, 3855 Health Sciences Drive, MC0803, La Jolla, CA 92093, USA.

Abstract

FAK is known as an integrin- and growth factor-associated tyrosine kinase promoting cell motility. Here we show that, during mouse development, FAK inactivation results in p53- and p21-dependent mesodermal cell growth arrest. Reconstitution of primary FAK-/-p21-/- fibroblasts revealed that FAK, in a kinase-independent manner, facilitates p53 turnover via enhanced Mdm2-dependent p53 ubiquitination. p53 inactivation by FAK required FAK FERM F1 lobe binding to p53, FERM F2 lobe-mediated nuclear localization, and FERM F3 lobe for connections to Mdm2 and proteasomal degradation. Staurosporine or loss of cell adhesion enhanced FERM-dependent FAK nuclear accumulation. In primary human cells, FAK knockdown raised p53-p21 levels and slowed cell proliferation but did not cause apoptosis. Notably, FAK knockdown plus cisplatin triggered p53-dependent cell apoptosis, which was rescued by either full-length FAK or FAK FERM re-expression. These studies define a scaffolding role for nuclear FAK in facilitating cell survival through enhanced p53 degradation under conditions of cellular stress.

PMID:
18206965
[PubMed - indexed for MEDLINE]
PMCID:
PMC2234035
Free PMC Article

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