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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Antioxid+Redox+Signal
2017 ; 27
(1
): 1-20
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MicroRNA-21 Mediates Angiotensin II-Induced Liver Fibrosis by Activating NLRP3
Inflammasome/IL-1? Axis via Targeting Smad7 and Spry1
#MMPMID27502441
Ning ZW
; Luo XY
; Wang GZ
; Li Y
; Pan MX
; Yang RQ
; Ling XG
; Huang S
; Ma XX
; Jin SY
; Wang D
; Li X
Antioxid Redox Signal
2017[Jul]; 27
(1
): 1-20
PMID27502441
show ga
AIMS: Angiotensin II (AngII), a vasoconstrictive peptide of the renin-angiotensin
system (RAS), promotes hepatic fibrogenesis and induces microRNA-21(mir-21)
expression. Angiotensin-(1-7) [Ang-(1-7)] is a peptide of the RAS, which
attenuates liver fibrosis. Recently, it was reported that the NOD-like receptor
family, pyrin domain containing 3 (NLRP3) inflammasome participated in liver
fibrosis. However, it remains unclear how mir-21 mediates AngII-induced NLRP3
inflammasome activation. We investigate the role of AngII-induced mir-21 in the
regulation of NLRP3 inflammasome/IL-1? axis in liver fibrosis. RESULTS: In vivo,
circulating mir-21 was upregulated in patients with liver fibrosis and was
positively correlated with liver fibrosis and oxidation. Treatment with Ang-(1-7)
inhibited mir-21, NLRP3 inflammasome, and liver fibrosis after bile duct ligation
(BDL) or AngII infusion. Inhibition of mir-21 suppressed the Smad7/Smad2/3/NOX4,
Spry1/ERK/NF-?B pathway, NLRP3 inflammasome, and liver fibrosis induced by AngII
infusion. In vitro, AngII upregulated mir-21 expression via targeting Smad7 and
Spry1 in primary hepatic stellate cells (HSCs). In contrast, Ang-(1-7) suppressed
mir-21 expression and oxidation induced by AngII. Overexpression of mir-21
promoted oxidation, and collagen production enhanced the effect of AngII on NLRP3
inflammasome activation via the Spry1/ERK/NF-?B, Smad7/Smad2/3/NOX4 pathways.
However, downregulation of mir-21 exerted the opposite effects. Innovation and
Conclusions: Mir-21 mediates AngII-activated NLRP3 inflammasome and resultant HSC
activation via targeting Spry1 and Smad7. Ang-(1-7) protected against BDL or
AngII infusion-induced hepatic fibrosis and inhibited mir-21 expression.
Antioxid. Redox Signal. 27, 1-20.