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Title: Engagement of human PECAM-1 (CD31) on human endothelial cells increases intracellular calcium ion concentration and stimulates prostacyclin release.
Authors: Gurubhagavatula, I
Amrani, Y
Pratico, D
Ruberg, FL
Albelda, SM
Panettieri, RA
First Published: 1-Jan-1998
Citation: J CLIN INVEST, 1998, 101 (1), pp. 212-222
Abstract: Platelet-endothelial cell adhesion molecule-1 (PECAM-1) is a member of the immunoglobulin superfamily that plays a role in a number of endothelial cell (EC) functions including migration, angiogenesis, and transmigration of leukocytes across endothelium. We postulated that one way PECAM-1 might exert its effects was by regulating intracellular EC levels of calcium. Using single-cell fluorometry, we found that engagement of PECAM-1 by mAbs induced a slow but sustained increase in intracellular calcium, both in EC and in an adherent PECAM-1-transfected cell line that models endothelium. Generation of this signal was specific for certain anti-PECAM-1 antibodies, required the presence of the cytoplasmic domain, depended on extracellular calcium and on tyrosine phosphorylation, but did not require cross-linking; in fact, calcium increases were stimulated by certain Fab fragments. Activation of EC by PECAM-1 also caused a time-dependent increase in prostacyclin release. Given the importance of intracellular calcium and prostacyclin release as signaling molecules, engagement of PECAM-1 during cell-cell interactions may alter a number of EC functions including secretion of vasoactive mediators.
DOI Link: 10.1172/JCI269
ISSN: 0021-9738
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Infection, Immunity and Inflammation

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