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2016 ; 6
(ä): 28066
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IGF-1 protects tubular epithelial cells during injury via activation of ERK/MAPK
signaling pathway
#MMPMID27301852
Wu Z
; Yu Y
; Niu L
; Fei A
; Pan S
Sci Rep
2016[Jun]; 6
(ä): 28066
PMID27301852
show ga
Injury of renal tubular epithelial cells can induce acute renal failure and
obstructive nephropathy. Previous studies have shown that administration of
insulin-like growth factor-1 (IGF-1) ameliorates the renal injury in a mouse
unilateral ureteral obstruction (UUO) model, whereas the underlying mechanisms
are not completely understood. Here, we addressed this question. We found that
the administration of IGF-1 significantly reduced the severity of the renal
fibrosis in UUO. By analyzing purified renal epithelial cells, we found that
IGF-1 significantly reduced the apoptotic cell death of renal epithelial cells,
seemingly through upregulation of anti-apoptotic protein Bcl-2, at protein but
not mRNA level. Bioinformatics analyses and luciferase-reporter assay showed that
miR-429 targeted the 3'-UTR of Bcl-2 mRNA to inhibit its protein translation in
renal epithelial cells. Moreover, IGF-1 suppressed miR-429 to increase Bcl-2 in
renal epithelial cells to improve survival after UUO. Furthermore, inhibition of
ERK/MAPK signaling pathway in renal epithelial cells abolished the suppressive
effects of IGF-1 on miR-429 activation, and then the enhanced effects on Bcl-2 in
UUO. Thus, our data suggest that IGF-1 may protect renal tubular epithelial cells
via activation of ERK/MAPK signaling pathway during renal injury.