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2017 ; 16
(2
): 387-400
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MiR-30c protects diabetic nephropathy by suppressing epithelial-to-mesenchymal
transition in db/db mice
#MMPMID28127848
Zhao Y
; Yin Z
; Li H
; Fan J
; Yang S
; Chen C
; Wang DW
Aging Cell
2017[Apr]; 16
(2
): 387-400
PMID28127848
show ga
Epithelial-to-mesenchymal transition (EMT) plays a significant role in
tubulointerstitial fibrosis, which is a hallmark of diabetic nephropathy. Thus,
identifying the mechanisms of EMT activation could be meaningful. In this study,
loss of miR-30c accompanied with increased EMT was observed in renal tubules of
db/db mice and cultured HK2 cells exposed to high glucose. To further explore the
roles of miR-30c in EMT and tubulointerstitial fibrosis, recombinant
adeno-associated viral vector was applied to manipulate the expression of
miR-30c. In vivo study showed that overexpression of miR-30c suppressed EMT,
attenuated renal tubulointerstitial fibrosis and reduced proteinuria, serum
creatinine, and BUN levels. In addition, Snail1 was identified as a direct target
of miR-30c by Ago2 co-immunoprecipitation, luciferase reporter, and Western blot
assays. Downregulating Snail1 by siRNA reduced high glucose-induced EMT in HK2
cells, and miR-30c mimicked the effects. Moreover, miR-30c inhibited
Snail1-TGF-?1 axis in tubular epithelial cells undergoing EMT and thereby impeded
the release of TGF-?1; oppositely, knockdown of miR-30c enhanced the secretion of
TGF-?1 from epitheliums and significantly promoted proliferation of fibroblasts
and fibrogenesis of myofibroblasts, aggravated tubulointerstitial fibrosis, and
dysfunction of diabetic nephropathy. These results suggest a protective role of
miR-30c against diabetic nephropathy by suppressing EMT via inhibiting
Snail1-TGF-?1 pathway.