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2018 ; 4
(ä): 60
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Deubiquitinase function of A20 maintains and repairs endothelial barrier after
lung vascular injury
#MMPMID29796309
Soni D
; Wang DM
; Regmi SC
; Mittal M
; Vogel SM
; Schlüter D
; Tiruppathi C
Cell Death Discov
2018[]; 4
(ä): 60
PMID29796309
show ga
Vascular endothelial cadherin (VE-cad) expression at endothelial adherens
junctions (AJs) regulates vascular homeostasis. Here we show that endothelial A20
is required for VE-cad expression at AJs to maintain and repair the injured
endothelial barrier. In endothelial cell (EC)-restricted Tnfaip3 (A20) knockout
(A20(?EC) ) mice, LPS challenge caused uncontrolled lung vascular leak and
persistent sequestration of polymorphonuclear neutrophil (PMNs). Importantly,
A20(?EC) mice exhibited drastically reduced VE-cad expression in lungs compared
with wild-type counterparts. Endothelial expression of wild-type A20 but not the
deubiquitinase-inactive A20 mutant (A20(C103A)) prevented VE-cad ubiquitination,
restored VE-cad expression, and suppressed lung vascular leak in A20(?EC) mice.
Interestingly, IRAK-M-mediated nuclear factor-?B (NF-?B) signaling downstream of
TLR4 was required for A20 expression in ECs. interleukin-1 receptor-associated
kinase M (IRAK-M) knockdown suppressed basal and LPS-induced A20 expression in
ECs. Further, in vivo silencing of IRAK-M in mouse lung vascular ECs through the
CRISPR-Cas9 system prevented expression of A20 and VE-cad while augmenting lung
vascular leak. These results suggest that targeting of endothelial A20 is a
potential therapeutic strategy to restore endothelial barrier integrity in the
setting of acute lung injury.