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. 1994 Nov 2;127(4):1129–1137. doi: 10.1083/jcb.127.4.1129

Integrin alpha v beta 3 differentially regulates adhesive and phagocytic functions of the fibronectin receptor alpha 5 beta 1

PMCID: PMC2200054  PMID: 7525603

Abstract

The plasma protein fibronectin is an important opsonin in wound repair and host defense. To better understand the process of fibronectin- mediated phagocytosis, we have transfected K562 cells, which endogenously express alpha 5 beta 1, with alpha v beta 3. In these transfectants, antibodies to alpha v beta 3 block phagocytosis of fibronectin-opsonized beads completely, even though half the ingestion occurs through endogenous alpha 5 beta 1 receptors. alpha 5 beta 1- mediated adhesion to fibronectin-coated surfaces is unaffected by alpha v beta 3 ligation. Neither alpha v beta 5 nor alpha M beta 2 ligation affects alpha 5 beta 1 phagocytic function in transfectants expressing these receptors. Pharmacologic data suggest that alpha v beta 3 ligation suppresses the phagocytic competence of high affinity alpha 5 beta 1 receptors through a signal transduction pathway, perhaps involving protein kinase C. In addition to its significance for phagocytosis, alpha v beta 3 regulation of alpha 5 beta 1 function may be significant for its roles in cell migration, metastasis, and angiogenesis.

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Selected References

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