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2017 ; 7
(1
): 5690
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Metformin ameliorates the Phenotype Transition of Peritoneal Mesothelial Cells
and Peritoneal Fibrosis via a modulation of Oxidative Stress
#MMPMID28720775
Shin HS
; Ko J
; Kim DA
; Ryu ES
; Ryu HM
; Park SH
; Kim YL
; Oh ES
; Kang DH
Sci Rep
2017[Jul]; 7
(1
): 5690
PMID28720775
show ga
Phenotype transition of peritoneum is an early mechanism of peritoneal fibrosis.
Metformin, 5'-adenosine monophosphate-activated protein kinase (AMPK) activator,
has recently received a new attention due to its preventive effect on organ
fibrosis and cancer metastasis by inhibiting epithelial-to-mesenchymal transition
(EMT). We investigated the effect of metformin on EMT of human peritoneal
mesothelial cells (HPMC) and animal model of peritoneal dialysis (PD).
TGF-?1-induced EMT in HPMC was ameliorated by metformin. Metformin alleviated
NAPDH oxidase- and mitochondria-mediated ROS production with an increase in
superoxide dismutase (SOD) activity and SOD2 expression. Metformin inhibited the
activation of Smad2/3 and MAPK, GSK-3? phosphorylation, nuclear translocalization
of ?-catenin and Snail in HPMCs. Effect of metformin on TGF-?1-induced EMT was
ameliorated by either AMPK inhibitor or AMPK gene silencing. Another AMPK
agonist, 5-amino-1-?-D-ribofuranosyl-imidazole-4-carboxamide partially blocked
TGF-?1-induced EMT. In animal model of PD, intraperitoneal metformin decreased
the peritoneal thickness and EMT with an increase in ratio of reduced to oxidized
glutathione and the expression of SOD whereas it decreased the expression of
nitrotyrosine and 8-hydroxy-2'-deoxyguanosine. Therefore, a modulation of AMPK in
peritoneum can be a novel tool to prevent peritoneal fibrosis by providing a
favorable oxidant/anti-oxidant milieu in peritoneal cavity and ameliorating
phenotype transition of peritoneal mesothelial cells.