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. 1994 Aug 16;91(17):8214–8218. doi: 10.1073/pnas.91.17.8214

Feedback regulation of cell-substratum adhesion by integrin-mediated intracellular Ca2+ signaling.

M D Sjaastad 1, B Angres 1, R S Lewis 1, W J Nelson 1
PMCID: PMC44576  PMID: 8058782

Abstract

Integrin binding to extracellular matrix (ECM) regulates cell migration and gene expression in embryogenesis, metastasis, would healing, and the inflammatory response. In many cases, binding of integrins to ECM triggers intracellular signaling pathways. The regulatory roles of intracellular signaling mechanisms in these events are poorly understood. Using single-cell analysis, we demonstrate that beads coated with peptide containing Arg-Gly-Asp (RGD), an integrin recognition motif found in many ECM proteins, elicit a rapid transient increase in intracellular calcium in Madin-Darby canine kidney (MDCK) epithelial cells. Also, significantly more beads bind to responding cells than to nonresponders. Several independent methods that inhibit RGD-induced Ca2+ signaling decrease both the number of beads bound and the strength of adhesion to an RGD-coated substratum. These results indicate that intracellular Ca2+ signaling participates in a positive feedback loop that enhances integrin-mediated cell adhesion.

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Selected References

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