© 1999 by European Society of Cardiology
Copyright © 1999, European Society of Cardiology
Platelet-derived growth factor-BB (PDGF-BB) regulation of migration and focal adhesion kinase phosphorylation in rabbit aortic vascular smooth muscle cells: roles of phosphatidylinositol 3-kinase and mitogen-activated protein kinases
Wolfson Institute for Biomedical Research and Department of Medicine, University College London, 5 University Street, London WC1E 6JJ, UK
* Corresponding author. Tel.: +44-171-209-6620; Fax: +44-171-209-6212; E-mail: I.Zachary@ucl.ac.uk
Objective: Phosphatidylinositol 3'-kinase (PI3-kinase) is implicated in cell migration and focal adhesion kinase (FAK) phosphorylation. In contrast, it has been proposed that mitogen-activated protein (MAP) kinases are essential for proliferation but may be dissociated from chemotactic signalling. We investigated the roles of PI3-kinase and p42/p44 MAP kinases in cell migration and FAK tyrosine phosphorylation induced by platelet-derived growth factor-BB (PDGF-BB) in rabbit aortic vascular smooth muscle cells (VSMCs). The roles of PI3-kinase and MAP kinase pathways in the chemotactic response to insulin-like growth factor-I (IGF-I) were also examined. Methods: The roles of PI3-kinase and p42/p44 MAP kinases were assessed using the PI3-kinase inhibitors, wortmannin and LY294002, and an inhibitor of MAP kinase kinase, PD98059. PI3-kinase activity was measured by phosphatidylinositol phosphorylation in anti-phosphotyrosine immunoprecipitates and by thin layer chromatography of phosphorylated products. Phosphorylation was assessed by immunoprecipitation with anti-phosphotyrosine antibodies and Western blotting with FAK-specific antibody. Migration was evaluated in a chemotaxis chamber using polycarbonate filters with an 8-mm pore size. Results: Neither wortmannin nor LY294002 significantly reduced PDGF-BB stimulation of FAK tyrosine phosphorylation, chemotaxis or immunofluorescent staining of focal adhesions in VSMCs. PD98059, a specific inhibitor of MAP kinase activation, did not inhibit FAK tyrosine phosphorylation but markedly inhibited the migratory response of VSMCs to PDGF-BB. IGF-I also stimulated migration of VSMCs, and, relative to the effect of PDGF-BB, induced smaller increases in PI3-kinase and MAP kinase activities. Both wortmannin and PD98059 partially inhibited the migratory response to IGF-I. Conclusions: PDGF-BB stimulation of both FAK tyrosine phosphorylation and migration in VSMCs are not dependent on activation of PI3-kinase. While PDGF-BB stimulation of FAK tyrosine phosphorylation is not dependent on p42/p44 MAP kinase activation, PDGF-BB and IGF-I both stimulate p42/p44 MAP kinase activity and the chemotactic response to these factors is partially dependent on MAP kinase activation.
KEYWORDS FAK; Paxillin; IGF-I; Wortmannin; Chemotaxis
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