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

and
*Department of Cell and Molecular Biology, Northwestern University
Medical School, Chicago, Illinois 60611; The
Department of
Medicine, Weill Medical College of Cornell University, New York, New
York 10021; and
Centre for Biomedical Sciences, School
of Biology, University of St. Andrews, St. Andrews, Scotland KY16
9TS
4 laminin subunit is a component of endothelial cell
basement membranes. An antibody (2A3) against the
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
v and
3
integrin antibodies and, consistent with this localization, TrHBMECs and HMVECs adhere to the
4 laminin subunit G domain in an
v
3-integrin-dependent manner. The
v
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
v
3
integrin-positive focal contacts. We have investigated the
function of
4-laminin and
v
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.
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