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Store-operated Ca2+ Entry Plays a Role in HMGB1-induced Vascular Endothelial Cell Hyperpermeability

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Journal PLoS One
Date 2015 Apr 18
PMID 25884983
Citations 10
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Abstract

Aims: Endothelial dysfunction, including increased endothelial permeability, is considered an early marker for atherosclerosis. High-mobility group box 1 protein (HMGB1) and extracellular Ca2+ entry, primarily mediated through store-operated Ca2+ entry (SOCE), are known to be involved in increasing endothelial permeability. The aim of this study was to clarify how HMGB1 could lead to endothelia hyperpermeability.

Methods And Results: We have shown that human vascular endothelial cell permeability is increased, while transendothelial electrical resistance and VE-cadherin expression were reduced by HMGB1 treatment. Two SOCE inhibitors and knockdown of stromal interaction molecule 1 (STIM1), a Ca2+ sensor mediating SOCE, inhibited the HMGB1-induced influx of Ca2+ and Src activation followed by significant suppression of endothelial permeability. Moreover, knockdown of Orai1, an essential pore-subunit of SOCE channels, decreased HMGB1-induced endothelial hyperpermeability.

Conclusions: These data suggest that SOCE, acting via STIM1, might be the predominant mechanism of Ca2+ entry in the modulation of endothelial cell permeability. STIM1 may thus represent a possible new therapeutic target against atherosclerosis.

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