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. 1990 Sep 1;111(3):1233–1243. doi: 10.1083/jcb.111.3.1233

Human microvascular endothelial cells use beta 1 and beta 3 integrin receptor complexes to attach to laminin

PMCID: PMC2116258  PMID: 1697296

Abstract

Microvascular endothelial cells (MEC) use a set of surface receptors to adhere not only to the vascular basement membrane but, during angiogenic stimulation, to the interstitium. We examined how cultured human MEC interact with laminin-rich basement membranes. By using a panel of monoclonal antibodies, we found that MEC cells express a number of integrin-related receptor complexes, including alpha 1 beta 1, alpha 2 beta 1, alpha 3 beta 1, alpha 5 beta 1, alpha 6 beta 1, alpha V beta 3. Attachment to laminin, a major adhesive protein in basement membranes, was studied in detail. Blocking monoclonal antibodies specific to different integrin receptor complexes showed that the alpha 6 beta 1 complex was important for MEC adhesion to laminin. In addition, blocking antibody also implicated the vitronectin receptor (alpha V beta 3) in laminin adhesion. We used ligand affinity chromatography of detergent-solubilized receptor complexes to further define receptor specificity. On laminin-Sepharose columns, we identified several integrin receptor complexes whose affinity for the ligand was dependent on the type of divalent cation present. Several beta 1 complexes, including alpha 1 beta 1, alpha 2 beta 1, and alpha 6 beta 1 bound strongly to laminin. In agreement with the antibody blocking experiments, alpha V beta 3 was found to bind well to laminin. However, unlike binding to its other ligands (e.g., vitronectin, fibrinogen, von Willebrand factor), alpha V beta 3 interaction with laminin did not appear to be Arg-Gly-Asp (RGD) sensitive. Finally, immunofluorescent staining demonstrated both beta 1 and beta 3 complexes in vinculin-positive focal adhesion plaques on the basal surface of MEC adhering to laminin-coated substrates. The results indicate that both these subfamilies of integrin heterodimers are involved in promoting MEC adhesion to laminin and the vascular basement membrane.

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Selected References

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