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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 Sci+Rep
2017 ; 7
(1
): 14369
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Mir-21 Mediates the Inhibitory Effect of Ang (1-7) on AngII-induced NLRP3
Inflammasome Activation by Targeting Spry1 in lung fibroblasts
#MMPMID29084974
Sun NN
; Yu CH
; Pan MX
; Zhang Y
; Zheng BJ
; Yang QJ
; Zheng ZM
; Meng Y
Sci Rep
2017[Oct]; 7
(1
): 14369
PMID29084974
show ga
MicroRNA-21 (mir-21) induced by angiotensin II (AngII) plays a vital role in the
development of pulmonary fibrosis, and the NLRP3 inflammasome is known to be
involved in fibrogenesis. However, whether there is a link between mir-21 and the
NLRP3 inflammasome in pulmonary fibrosis is unknown. Angiotensin-converting
enzyme 2/angiotensin(1-7) [ACE2/Ang(1-7)] has been shown to attenuate
AngII-induced pulmonary fibrosis, but it is not clear whether ACE2/Ang(1-7)
protects against pulmonary fibrosis by inhibiting AngII-induced mir-21
expression. This study's aim was to investigate whether mir-21 activates the
NLRP3 inflammasome and mediates the different effects of AngII and ACE2/Ang(1-7)
on lung fibroblast apoptosis and collagen synthesis. In vivo, AngII exacerbated
bleomycin (BLM)-induced lung fibrosis in rats, and elevated mir-21 and the NLRP3
inflammasome. In contrast, ACE2/Ang(1-7) attenuated BLM-induced lung fibrosis,
and decreased mir-21 and the NLRP3 inflammasome. In vitro, AngII activated the
NLRP3 inflammasome by up-regulating mir-21, and ACE2/Ang(1-7) inhibited NLRP3
inflammasome activation by down-regulating AngII-induced mir-21. Over-expression
of mir-21 activated the NLRP3 inflammasome via the ERK/NF-?B pathway by targeting
Spry1, resulting in apoptosis resistance and collagen synthesis in lung
fibroblasts. These results indicate that mir-21 mediates the inhibitory effect of
ACE2/Ang(1-7) on AngII-induced activation of the NLRP3 inflammasome by targeting
Spry1 in lung fibroblasts.