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2016 ; 6
(ä): 26571
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Cold-inducible RNA-binding protein causes endothelial dysfunction via activation
of Nlrp3 inflammasome
#MMPMID27217302
Yang WL
; Sharma A
; Wang Z
; Li Z
; Fan J
; Wang P
Sci Rep
2016[May]; 6
(ä): 26571
PMID27217302
show ga
Cold-inducible RNA-binding protein (CIRP) is a damage-associated molecular
pattern (DAMP) molecule which stimulates proinflammatory cytokine release in
hemorrhage and sepsis. Under these medical conditions, disruption of endothelial
homeostasis and barrier integrity, typically induced by proinflammatory
cytokines, is an important factor contributing to morbidity and mortality.
However, the role of CIRP in causing endothelial dysfunction has not been
investigated. In this study, we show that intravenous injection of recombinant
murine CIRP (rmCIRP) in C57BL/6 mice causes lung injury, evidenced by vascular
leakage, edema, increased leukocyte infiltration and cytokine production in the
lung tissue. The CIRP-induced lung damage is accompanied with endothelial cell
(EC) activation marked by upregulation of cell-surface adhesion molecules
E-selectin and ICAM-1. Using in vitro primary mouse lung vascular ECs (MLVECs),
we demonstrate that rmCIRP treatment directly increases the ICAM-1 protein
expression and activates NAD(P)H oxidase in MLVECs. Importantly, CIRP stimulates
the assembly and activation of Nlrp3 inflammasome in MLVECs accompanied with
caspase-1 activation, IL-1? release and induction of proinflammatory cell death
pyroptosis. Finally, our study demonstrates CIRP-induced EC pyroptosis in the
lungs of C57BL/6 mice for the first time. Taken together, the released CIRP in
shock can directly activate ECs and induce EC pyroptosis to cause lung injury.