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Mol. Cell. Biol., Aug 1997, 4406-4418, Vol 17, No. 8
Copyright © 1997, American Society for Microbiology

Phosphatidylinositol 3-kinase is required for integrin-stimulated AKT and Raf-1/mitogen-activated protein kinase pathway activation

WG King, MD Mattaliano, TO Chan, PN Tsichlis and JS Brugge
ARIAD Pharmaceuticals, Inc., Cambridge, Massachusetts 02139, USA.

Cell attachment to fibronectin stimulates the integrin-dependent interaction of p85-associated phosphatidylinositol (PI) 3-kinase with integrin-dependent focal adhesion kinase (FAK) as well as activation of the Ras/mitogen-activated protein (MAP) kinase pathway. However, it is not known if this PI 3-kinase-FAK interaction increases the synthesis of the 3-phosphorylated phosphoinositides (3-PPIs) or what role, if any, is played by activated PI 3-kinase in integrin signaling. We demonstrate here the integrin-dependent accumulation of the PI 3-kinase products, PI 3,4-bisphosphate [PI(3,4)P2] and PI(3,4,5)P3, as well as activation of AKT kinase, a serine/threonine kinase that can be stimulated by binding of PI(3,4)P2. The PI 3-kinase inhibitors wortmannin and LY294002 significantly decreased the integrin-induced accumulation of the 3-PPIs and activation of AKT kinase, without having significant effects on the levels of PI(4,5)P2 or tyrosine phosphorylation of paxillin. These inhibitors also reduced cell adhesion/spreading onto fibronectin but had no effect on attachment to polylysine. Interestingly, integrin-mediated Erk-2, Mek-1, and Raf-1 activation, but not Ras-GTP loading, was inhibited at least 80% by wortmannin and LY294002. In support of the pharmacologic results, fibronectin activation of Erk-2 and AKT kinases was completely inhibited by overexpression of a dominant interfering p85 subunit of PI 3-kinase. We conclude that integrin-mediated adhesion to fibronectin results in the accumulation of the PI 3-kinase products PI(3,4)P2 and PI(3,4,5)P3 as well as the PI 3-kinase-dependent activation of the kinases Raf-1, Mek-1, Erk-2, and AKT and that PI 3-kinase may function upstream of Raf-1 but downstream of Ras in integrin activation of Erk-2 MAP and AKT kinases.


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