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

* Departments of Stomatology and Anatomy, 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
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
Department of Morphogenesis, Institute of Molecular Embryology and Genetics, Kumamoto University School of Medicine,
Kumamoto 860, Japan
/
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.
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