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J. Cell Biol., Volume 143, Number 2, October 19, 1998 547-560

Extracellular Matrix Survival Signals Transduced by Focal Adhesion Kinase Suppress p53-mediated Apoptosis

Dusko Ilic',* Eduardo A.C. Almeida,* David D. Schlaepfer,§ Paul Dazin,Dagger Shinichi Aizawa,parallel and Caroline H. Damsky*

* Departments of Stomatology and Anatomy, Dagger  Howard Hughes Medical Institute, University of California San Francisco, San Francisco, California 94143-0512; §  The Scripps Research Institute, Department of Immunology, La Jolla, California 92037; and parallel  Department of Morphogenesis, Institute of Molecular Embryology and Genetics, Kumamoto University School of Medicine, Kumamoto 860, Japan

In many malignant cells, both the anchorage requirement for survival and the function of the p53 tumor suppressor gene are subverted. These effects are consistent with the hypothesis that survival signals from extracellular matrix (ECM) suppress a p53-regulated cell death pathway. We report that survival signals from fibronectin are transduced by the focal adhesion kinase (FAK). If FAK or the correct ECM is absent, cells enter apoptosis through a p53-dependent pathway activated by protein kinase C lambda /iota and cytosolic phospholipase A2. This pathway is suppressible by dominant-negative p53 and Bcl2 but not CrmA. Upon inactivation of p53, cells survive even if they lack matrix signals or FAK. This is the first report that p53 monitors survival signals from ECM/FAK in anchorage- dependent cells.

Key words: fibronectinsurvivalFAKp53apoptosis


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