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. 1995 Feb;95(2):713–724. doi: 10.1172/JCI117718

The adhesive and migratory effects of osteopontin are mediated via distinct cell surface integrins. Role of alpha v beta 3 in smooth muscle cell migration to osteopontin in vitro.

L Liaw 1, M P Skinner 1, E W Raines 1, R Ross 1, D A Cheresh 1, S M Schwartz 1, C M Giachelli 1
PMCID: PMC295539  PMID: 7532190

Abstract

Osteopontin is an arginine-glycine-aspartate containing acidic glycoprotein postulated to mediate adhesion, migration, and biomineralization in diverse tissues. The mechanisms explaining this multifunctionality are not well understood, although it is known that one osteopontin receptor is the alpha v beta 3 integrin. In this work, we studied human smooth muscle cells varying in alpha v beta 3 levels to identify additional osteopontin receptors. We report that, in addition to alpha v beta 3, both alpha v beta 5 and alpha v beta 1 are osteopontin receptors. Moreover, the presence or absence of alpha v beta 3 on the cell surface altered the adhesive and migratory responses of smooth muscle cells to osteopontin. Adhesion of alpha v beta 3-deficient cell populations to osteopontin was only half that of cells containing alpha v beta 3, and migration toward an osteopontin gradient in the Boyden chamber was dependent on cell surface alpha v beta 3. Although alpha v beta 3-deficient smooth muscle cells were unable to migrate to osteopontin, they did migrate significantly in response to vitronectin and fibronectin. These findings represent the first description of alpha v beta 5 and alpha v beta 1 as osteopontin receptors and suggest that, while adhesion to osteopontin is supported by integrins containing beta 1, beta 3, and beta 5, migration in response to osteopontin appears to depend on alpha v beta 3. Thus, interaction with distinct receptors is one mechanism by which osteopontin may initiate multiple functions.

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Selected References

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