PMID: 9548728May 23, 1998Paper

Integrin and cadherin synergy regulates contact inhibition of migration and motile activity

The Journal of Cell Biology
A HuttenlocherA F Horwitz

Abstract

Integrin receptors play a central role in cell migration through their roles as adhesive receptors for both other cells and extracellular matrix components. In this study, we demonstrate that integrin and cadherin receptors coordinately regulate contact-mediated inhibition of cell migration. In addition to promoting proliferation (Sastry, S., M. Lakonishok, D. Thomas, J. Muschler, and A. Horwitz. 1996. J. Cell Biol. 133:169-184), ectopic expression of the alpha5 integrin in cultures of primary quail myoblasts promotes a striking contact-mediated inhibition of cell migration. Myoblasts ectopically expressing alpha5 integrin (alpha5 myoblasts) move normally when not in contact, but upon contact, they show inhibition of migration and motile activity (i.e., extension and retraction of membrane protrusions). As a consequence, these cells tend to grow in aggregates and do not migrate to close a wound. This phenotype is also seen with ectopic expression of beta1 integrin, paxillin, or activated FAK (CD2 FAK) and therefore appears to result from enhanced integrin-mediated signaling. The contact inhibition observed in the alpha5 myoblasts is mediated by N-cadherin, whose expression is upregulated more than fivefold. Perturbation studies...Continue Reading

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