PECAM-1 (CD31) regulates a hydrogen peroxide-activated nonselective cation channel in endothelial cells

The Journal of Cell Biology
Guangju JiMichael I Kotlikoff

Abstract

Hydrogen peroxide (H2O2) released by neutrophils is an important mediator of endothelial cell (EC) injury and vascular inflammation via its effect on EC-free Ca2+, [Ca2+]i. Although the underlying mechanisms are not well understood, platelet endothelial cell adhesion molecule (PECAM)-1/CD-31 is a critical modulator of neutrophil-EC transmigration. PECAM-1 is also known to regulate EC calcium signals and to undergo selective tyrosine phosphorylation. Here, we report that PECAM-1 molecules transduce EC responses to hydrogen peroxide. In human umbilical vein EC and REN cells (a PECAM-1-negative EC-like cell line) stably transfected with PECAM-1 (RHP), noncytolytic H2O2 exposure (100-200 microM H2O2) activated a calcium-permeant, nonselective cation current, and a transient rise in [Ca2+]i of similar time course. Neither response was observed in untransfected REN cells, and H2O2-evoked cation current was ablated in REN cells transfected with PECAM-1 constructs mutated in the cytoplasmic tyrosine-containing domain. The PECAM-dependent H2O2 current was inhibited by dialysis of anti-PECAM-1 cytoplasmic domain antibodies, required Src family tyrosine kinase activity, was independent of inositol trisphosphate receptor activation, and re...Continue Reading

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Methods Mentioned

BETA
confocal microscopy
immunoprecipitation
transfection
flow cytometry
antibody dialysis

Software Mentioned

LaserPix
Lasersharp

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