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2016 ; 7
(16
): 21315-31
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English Wikipedia
Metformin inhibits 17?-estradiol-induced epithelial-to-mesenchymal transition via
?Klotho-related ERK1/2 signaling and AMPK? signaling in endometrial
adenocarcinoma cells
#MMPMID26824324
Liu Z
; Qi S
; Zhao X
; Li M
; Ding S
; Lu J
; Zhang H
Oncotarget
2016[Apr]; 7
(16
): 21315-31
PMID26824324
show ga
The potential role of metformin in treating endometrial cancer remains to be
explored. The current study investigated the role of metformin in
17?-estradiol-induced epithelial-mesenchymal transition (EMT) in endometrial
adenocarcinoma cells. We found that 17?-estradiol promoted proliferation and
migration, attenuated apoptosis in both estrogen receptor (ER) positive and ER
negative endometrial adenocarcinoma cells (Ishikawa and KLE cells, respectively).
Metformin abolished 17?-estradiol-induced cell proliferation and reversed
17?-estradiol-induced EMT in Ishikawa cells. In addition, metformin increased the
expression of ?Klotho, a fibroblast growth factors (FGFs) coreceptor, and
decreased ERK1/2 phosphorylation in both Ishikawa and KLE cells. Decreased
expression of ?Klotho was noted in human endometrial adenocarcinomas, and
plasmid-driven expression of ?Klotho in Ishikawa cells abolished
17?-estradiol-induced EMT via inhibiting ERK1/2 signaling. ?Klotho expression and
metformin show synergetic effects on the proliferation and the EMT in Ishikawa
cells. Furthermore, we demonstrated that the anti-EMT effects of metformin could
be partly abolished by introducing Compound C, a specific AMPK? signaling
inhibitor. In conclusion, metformin abolishes 17?-estradiol-induced cell
proliferation and EMT in endometrial adenocarcinoma cells by upregulating ?Klotho
expression, inhibiting ERK1/2 signaling, and activating AMPK? signaling. Our
study provides novel mechanistic insight into the anti-tumor effects of
metformin.