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2015 ; 10
(4
): e0123432
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English Wikipedia
Store-operated Ca2+ entry plays a role in HMGB1-induced vascular endothelial cell
hyperpermeability
#MMPMID25884983
Zou M
; Dong H
; Meng X
; Cai C
; Li C
; Cai S
; Xue Y
PLoS One
2015[]; 10
(4
): e0123432
PMID25884983
show ga
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.