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Vol. 12, Issue 1, 85-100, January 2001

Structure and Function of a Vimentin-associated Matrix Adhesion in Endothelial Cells

Meredith Gonzales,* Babette Weksler,dagger Daisuke Tsuruta,* Robert D. Goldman,* Kristine J. Yoon,* Susan B. Hopkinson,* Frederick W. Flitney,Dagger and Jonathan C. R. Jones*§

 *Department of Cell and Molecular Biology, Northwestern University Medical School, Chicago, Illinois 60611;  dagger Department of Medicine, Weill Medical College of Cornell University, New York, New York 10021; and  Dagger Centre for Biomedical Sciences, School of Biology, University of St. Andrews, St. Andrews, Scotland KY16 9TS

The alpha 4 laminin subunit is a component of endothelial cell basement membranes. An antibody (2A3) against the alpha 4 laminin G domain stains focal contact-like structures in transformed and primary microvascular endothelial cells (TrHBMECs and HMVECs, respectively), provided the latter cells are activated with growth factors. The 2A3 antibody staining colocalizes with that generated by alpha v and beta 3 integrin antibodies and, consistent with this localization, TrHBMECs and HMVECs adhere to the alpha 4 laminin subunit G domain in an alpha vbeta 3-integrin-dependent manner. The alpha vbeta 3 integrin/2A3 antibody positively stained focal contacts are recognized by vinculin antibodies as well as by antibodies against plectin. Unusually, vimentin intermediate filaments, in addition to microfilament bundles, interact with many of the alpha vbeta 3 integrin-positive focal contacts. We have investigated the function of alpha 4-laminin and alpha vbeta 3-integrin, which are at the core of these focal contacts, in cultured endothelial cells. Antibodies against these proteins inhibit branching morphogenesis of TrHBMECs and HMVECs in vitro, as well as their ability to repopulate in vitro wounds. Thus, we have characterized an endothelial cell matrix adhesion, which shows complex cytoskeletal interactions and whose assembly is regulated by growth factors. Our data indicate that this adhesion structure may play a role in angiogenesis.


§ Corresponding author. E-mail address: j-jones3{at}nwu.edu.


Molecular Biology of the Cell
Vol. 12, 85-100, January 2001
Copyright © 2001 by The American Society for Cell Biology



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