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2015 ; 10
(9
): e0135858
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gab.com Text
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English Wikipedia
Metformin Ameliorates Inflammatory Bowel Disease by Suppression of the STAT3
Signaling Pathway and Regulation of the between Th17/Treg Balance
#MMPMID26360050
Lee SY
; Lee SH
; Yang EJ
; Kim EK
; Kim JK
; Shin DY
; Cho ML
PLoS One
2015[]; 10
(9
): e0135858
PMID26360050
show ga
OBJECTIVE: Metformin is used to treat type 2 diabetes. We sought to determine
whether metformin reduces inflammation, by regulating p-signal transducer and
activator of transcription 3 (STAT3) expression and T-helper 17 (Th17) cell
proliferation, in a mouse model of inflammatory bowel disease (IBD). METHODS: IBD
mice were administered metformin for 16 days and their tissues were analyzed.
AMP-activated protein kinase (AMPK), the mammalian target of rapamycin (mTOR),
p-STAT3 and p-STAT5 in the spleen and lymph nodes were detected using
immunohistochemistry and confocal microscopy. Gene expression was determined
using quantitative PCR assays, and protein expression levels were measured using
western blotting and enzyme-linked immunosorbent assays. Human HT-29 cell
proliferation was evaluated using MTT assays. RESULTS: Metformin reduced disease
activity index scores and inhibited weight loss. Metformin also decreased the
colonic histological score and inflammatory mediators and increased colon lengths
increased. Treatment with metformin inhibited the expression of interleukin
(IL)-17, p-STAT3, and p-mTOR. In contrast, metformin treatment increased
expression levels of p-AMPK and Foxp3. In addition, expression of inflammatory
cytokines decreased in a dose-dependent manner in inflamed human HT-29 cells
cultured with metformin at various concentrations. CONCLUSIONS: Metformin
attenuates IBD severity and reduces inflammation through the inhibition of
p-STAT3 and IL-17 expression. Our results have increased our understanding of
this chronic inflammatory disease, and support the strategy of using p-STAT3
inhibitors to treat IBD.