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2016 ; 6
(ä): 37492
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The coordinated roles of miR-26a and miR-30c in regulating TGF?1-induced
epithelial-to-mesenchymal transition in diabetic nephropathy
#MMPMID27874055
Zheng Z
; Guan M
; Jia Y
; Wang D
; Pang R
; Lv F
; Xiao Z
; Wang L
; Zhang H
; Xue Y
Sci Rep
2016[Nov]; 6
(ä): 37492
PMID27874055
show ga
MicroRNAs (miRNAs) play vital roles in the development of diabetic nephropathy.
Here, we compared the protective efficacies of miR-26a and miR-30c in renal
tubular epithelial cells (NRK-52E) and determined whether they demonstrated
additive effects in the attenuation of renal fibrosis. TGF?1 suppressed miR-26a
and miR-30c expression but up-regulated pro-fibrotic markers in NRK-52E cells,
and these changes were also found in the kidney cortex of 40-week-old diabetic
Otsuka Long-Evans Tokushima fatty (OLETF) rats. Bioinformatic analyses and
luciferase assays further demonstrated that both miR-26a and miR-30c targeted
connective tissue growth factor (CTGF); additionally, Snail family zinc finger 1
(Snail1), a potent epithelial-to-mesenchymal transition (EMT) inducer, was
targeted by miR-30c. Overexpression of miR-26a and miR-30c coordinately decreased
CTGF protein levels and subsequently ameliorated TGF?1-induced EMT in NRK-52E
cells. Co-silencing of miR-26a and miR-30c exhibited the opposite effect.
Moreover, miR-26a and miR-30c co-silenced CTGF to decrease ERK1/2 and p38 MAPK
activation. Furthermore, miR-26a was up-regulated in urinary extracellular
vesicles of diabetic nephropathy patients. Our study provides evidence for the
cooperative roles of miR-26a and miR-30c in the pathogenesis of diabetic
nephropathy, and the co-targeting of miR-26a and miR-30c could provide a new
direction for diabetic nephropathy treatment.