期刊
JOURNAL OF CELL BIOLOGY
卷 150, 期 3, 页码 627-641出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.150.3.627
关键词
cell motility; phosphoinositide 3-kinase; PDGF; integrin; vinculin
类别
资金
- NICHD NIH HHS [DDRCP-50-HD-32901] Funding Source: Medline
- NIMH NIH HHS [MH50102] Funding Source: Medline
- NINDS NIH HHS [NS29632] Funding Source: Medline
Focal adhesions are an elaborate network of interconnecting proteins linking actin stress fibers to the extracellular matrix substrate. Modulation of the focal adhesion plaque provides a mechanism for the regulation of cellular adhesive strength. Using interference reflection microscopy, we found that activation of phosphoinositide 3-kinase (PI 3-kinase) by PDGF induces the dissipation of focal adhesions. Loss of this close apposition between the cell membrane and the extracellular matrix coincided with a redistribution of alpha-actinin and vinculin from the focal adhesion complex to the Triton X-100-soluble fraction. In contrast, talin and paxillin remained localized to focal adhesions, suggesting that activation of PI 3-kinase induced a restructuring of the plaque rather than complete dispersion. Furthermore, phosphatidylinositol (3,4,5)-trisphosphate (PtdIns (3,4,5)-P-3), a lipid product of PI 3-kinase, was sufficient to induce restructuring of the focal adhesion plaque. We also found that PtdIns (3,4,5)-P3 binds to cr-actinin in PDGF-treated cells. Further evidence demonstrated that activation of PI 3-kinase by PDGF induced a decrease in the association of ol-actinin with the integrin beta subunit, and that PtdIns (3,4,5)-P-3 could disrupt this interaction in vitro. Modification of focal adhesion structure by PI 3-kinase and its lipid product, PtdIns (3,4,5)-P-3, has important implications for the regulation of cellular adhesive strength and motility.
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