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2015 ; 10
(9
): e0138390
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G9a Inhibition Induces Autophagic Cell Death via AMPK/mTOR Pathway in Bladder
Transitional Cell Carcinoma
#MMPMID26397365
Li F
; Zeng J
; Gao Y
; Guan Z
; Ma Z
; Shi Q
; Du C
; Jia J
; Xu S
; Wang X
; Chang L
; He D
; Guo P
PLoS One
2015[]; 10
(9
): e0138390
PMID26397365
show ga
G9a has been reported to highly express in bladder transitional cell carcinoma
(TCC) and G9a inhibition significantly attenuates cell proliferation, but the
underlying mechanism is not fully understood. The present study aimed at
examining the potential role of autophagy in the anti-proliferation effect of G9a
inhibition on TCC T24 and UMUC-3 cell lines in vitro. We found that both
pharmaceutical and genetical G9a inhibition significantly attenuated cell
proliferation by MTT assay, Brdu incorporation assay and colony formation assay.
G9a inhibition induced autophagy like morphology as determined by transmission
electron microscope and LC-3 fluorescence assay. In addition, autophagy flux was
induced by G9a inhibition in TCC cells, as determined by p62 turnover assay and
LC-3 turnover assay. The autophagy induced positively contributed to the
inhibition of cell proliferation because the growth attenuation capacity of G9a
inhibition was reversed by autophagy inhibitors 3-MA. Mechanically, AMPK/mTOR
pathway was identified to be involved in the regulation of G9a inhibition induced
autophagy. Intensively activating mTOR by Rheb overexpression attenuated
autophagy and autophagic cell death induced by G9a inhibition. In addition,
pre-inhibiting AMPK by Compound C attenuated autophagy together with the
anti-proliferation effect induced by G9a inhibition while pre-activating AMPK by
AICAR enhanced them. In conclusion, our results indicate that G9a inhibition
induces autophagy through activating AMPK/mTOR pathway and the autophagy induced
positively contributes to the inhibition of cell proliferation in TCC cells.
These findings shed some light on the functional role of G9a in cell metabolism
and suggest that G9a might be a therapeutic target in bladder TCC in the future.