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. 1992 Jun 1;117(5):1109–1117. doi: 10.1083/jcb.117.5.1109

Regulation of alpha 2 beta 1-mediated fibroblast migration on type I collagen by shifts in the concentrations of extracellular Mg2+ and Ca2+ [published erratum appears in J Cell Biol 1992 Jul;118(1):219]

PMCID: PMC2289472  PMID: 1374416

Abstract

Extracellular Ca2+ can reverse the Mg(2+)-dependent, alpha 2 beta 1- mediated adhesion of WI38 human fibroblasts to type I collagen substrates. Affinity chromatography data also demonstrate that Ca2+ can specifically elute the fibroblast alpha 2 beta 1 integrin bound to type I collagen-Sepharose in Mg2+. In modified Boyden chamber migration assays, Mg2+ alone supports the alpha 2 beta 1-mediated migration of fibroblasts on type I collagen substrates, while Ca2+ does not. However, a twofold enhancement in migration was observed when combinations of the two cations were used, with optimal migration observed when the Mg2+/Ca2+ ratio was higher than one. Inhibitory mAbs directed against various integrin subunits demonstrate that these observed cation effects appear to be mediated primarily by alpha 2 beta 1. These data, together with reports that under certain physiological conditions significant fluctuations in the concentrations of extracellular Ca2+ and Mg2+ can take place in vivo, suggest that the ratio between these two cations is involved in the up- and downregulation of integrin function, and thus, may influence cell migratory behavior.

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Selected References

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