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2017 ; 8
(3
): e2658
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MicroRNA-27a promotes podocyte injury via PPAR?-mediated ?-catenin activation in
diabetic nephropathy
#MMPMID28277542
Zhou Z
; Wan J
; Hou X
; Geng J
; Li X
; Bai X
Cell Death Dis
2017[Mar]; 8
(3
): e2658
PMID28277542
show ga
Podocyte injury has a pivotal role in the pathogenesis of diabetic nephropathy
(DN). MicroRNA-27a (miR-27a), peroxisome proliferator-activated receptor ?
(PPAR?) and ?-catenin pathways have been involved in the pathogenesis of DN.
Herein, we asked whether miR-27a mediates podocyte injury through PPAR?/?-catenin
signaling in DN. The functional relevance of miR-27a, PPAR? and ?-catenin were
investigated in cultured podocytes and glomeruli of diabetic rats and patients
using in vitro and in vivo approaches. Podocyte injury was assessed by migration,
invasion and apoptosis assay. Biological parameters were analyzed using
enzyme-linked immunosorbent assay. We found that high glucose stimulated miR-27a
expression, which, by negatively targeting PPAR?, activated ?-catenin signaling
as evidenced by upregulation of ?-catenin target genes, snail1 and ?-smooth
muscle actin (?-SMA) and downregulation of podocyte-specific markers podocin and
synaptopodin. These changes caused podocyte injury as demonstrated by increased
podocyte mesenchymal transition, disrupted podocyte architectural integrity and
increased podocyte apoptosis. Furthermore, we provide evidence that miR-27a
contributed to unfavorable renal function and increased podocyte injury in
diabetic rats. Notably, miR-27a exhibited clinical and biological relevance as it
was linked to elevated serum creatinine, proteinuria and reduced creatinine
clearance rate. In addition, miR-27a upregulation and activation of
PPAR?/?-catenin signaling were verified in renal biopsy samples from DN patients.
We propose a novel role of the miR-27a/PPAR?/?-catenin axis in fostering the
progression toward more deteriorated podocyte injury in DN. Targeting miR-27a
could be a potential therapeutic approach for DN.