Crossref journal-article
Rockefeller University Press
The Journal of Cell Biology (291)
Abstract

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 α-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)-P3), 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 α-actinin in PDGF-treated cells. Further evidence demonstrated that activation of PI 3-kinase by PDGF induced a decrease in the association of α-actinin with the integrin β subunit, and that PtdIns (3,4,5)-P3 could disrupt this interaction in vitro. Modification of focal adhesion structure by PI 3-kinase and its lipid product, PtdIns (3,4,5)-P3, has important implications for the regulation of cellular adhesive strength and motility.

Bibliography

Greenwood, J. A., Theibert, A. B., Prestwich, G. D., & Murphy-Ullrich, J. E. (2000). Restructuring of Focal Adhesion Plaques by Pi 3-Kinase. The Journal of Cell Biology, 150(3), 627–642.

Authors 4
  1. Jeffrey A. Greenwood (first)
  2. Anne B. Theibert (additional)
  3. Glenn D. Prestwich (additional)
  4. Joanne E. Murphy-Ullrich (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 12:45 p.m.)
Deposited 2 years ago (July 28, 2023, 10:24 p.m.)
Indexed 1 month, 1 week ago (July 19, 2025, 11:41 p.m.)
Issued 25 years ago (Aug. 7, 2000)
Published 25 years ago (Aug. 7, 2000)
Published Online 25 years ago (Aug. 7, 2000)
Published Print 25 years ago (Aug. 7, 2000)
Funders 0

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@article{Greenwood_2000, title={Restructuring of Focal Adhesion Plaques by Pi 3-Kinase}, volume={150}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.150.3.627}, DOI={10.1083/jcb.150.3.627}, number={3}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Greenwood, Jeffrey A. and Theibert, Anne B. and Prestwich, Glenn D. and Murphy-Ullrich, Joanne E.}, year={2000}, month=aug, pages={627–642} }