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2016 ; 6
(ä): 27091
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miR-146a is essential for lipopolysaccharide (LPS)-induced cross-tolerance
against kidney ischemia/reperfusion injury in mice
#MMPMID27250735
Dai Y
; Jia P
; Fang Y
; Liu H
; Jiao X
; He JC
; Ding X
Sci Rep
2016[Jun]; 6
(ä): 27091
PMID27250735
show ga
MicroRNA-146a is one of most important microRNAs involved in development of
endotoxin tolerance via (toll-like receptors) TLRs/ NF-?B pathway. In this study,
we sought to identify the mechanistic role of miR-146a in mediating the
protective effect of lipopolysaccharide (LPS) pretreatment on kidney
ischemia/reperfusion injury. A locked nucleic acid-modified anti-miR-146a given
before LPS treatment knocked down miR-146a expression and completely negated
LPS-mediated protection against kidney ischemia/reperfusion injury. Knockdown of
miR-146a resulted in significantly higher histopathological scores for tubular
damage, expression of proinflammatory cytokines and chemokines, and neutrophil
and macrophage infiltration. Furthermore, knockdown of miR-146a greatly
up-regulated the protein levels of IL-1 receptor-associated kinase (IRAK-1) and
tumor-necrosis factor (TNF) receptor-associated factor 6 (TRAF6), which are known
target genes of miR-146a, leading to activation of NF-?B. Finally, elevation of
nuclear translocation of NF-?B p65/p50 and caspase-3 expression, degradation of
cytosolic IkB? and BcL-xL, and substantially exacerbation of tubular cell
apoptosis were inversely correlated with miR-146a expression. Taken together, our
results identify that miR146a exerts a kidney protective effect through negative
regulation of acute inflammatory response by suppressing NF-?B activation and
proinflammatory genes expression.