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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 J+Diabetes+Res
2018 ; 2018
(ä): 4728645
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MicroRNA-22 Promotes Renal Tubulointerstitial Fibrosis by Targeting PTEN and
Suppressing Autophagy in Diabetic Nephropathy
#MMPMID29850604
Zhang Y
; Zhao S
; Wu D
; Liu X
; Shi M
; Wang Y
; Zhang F
; Ding J
; Xiao Y
; Guo B
J Diabetes Res
2018[]; 2018
(ä): 4728645
PMID29850604
show ga
Renal tubulointerstitial fibrosis (TIF) is a major feature of diabetic
nephropathy (DN). There is increasing evidence demonstrating that microRNAs act
as key players in the regulation of autophagy and are involved in DN. However,
the exact link among microRNAs, autophagy, and TIF in DN is largely unknown. In
this study, our results showed that TIF was observed in DN rats together with
obvious autophagy suppression. Moreover, microRNA-22 (miR-22) was upregulated and
associated with reduced expression of its target gene phosphatase and tensin
homolog (PTEN) in both the kidneys of DN rats and high glucose-cultured NRK-52E
cells. Intriguingly, induction of autophagy by rapamycin antagonized high
glucose-induced collagen IV (Col IV) and ?-SMA expression. In addition, ectopic
expression of miR-22 suppressed autophagic flux and induced the expression of Col
IV and ?-SMA, whereas the inhibition of endogenous miR-22 effectively relieved
high glucose-induced autophagy suppression and the expression of Col IV and ?-SMA
in NRK-52E cells. Overexpression of PTEN protectively antagonized high glucose-
and miR-22-induced autophagy suppression and the expression of Col IV. Therefore,
our findings indicated that miR-22 may promote TIF by suppressing autophagy
partially via targeting PTEN and represents a novel and promising therapeutic
target for DN.