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2017 ; 8
(8
): e3007
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gab.com Text
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Metformin reverses prostate cancer resistance to enzalutamide by targeting
TGF-?1/STAT3 axis-regulated EMT
#MMPMID28837141
Liu Q
; Tong D
; Liu G
; Xu J
; Do K
; Geary K
; Zhang D
; Zhang J
; Zhang Y
; Li Y
; Bi G
; Lan W
; Jiang J
Cell Death Dis
2017[Aug]; 8
(8
): e3007
PMID28837141
show ga
Although the newly developed second-generation anti-androgen drug enzalutamide
can repress prostate cancer progression significantly, it only extends the
survival of prostate cancer patients by 4-6 months mainly due to the occurrence
of enzalutamide resistance. Most of the previous studies on AR antagonist
resistance have been focused on AR signaling. Therefore, the non-AR pathways on
enzalutamide resistance remain largely unknown. By using C4-2, CWR22Rv1 and LNCaP
cell lines, as well as mice bearing CWR22Rv1 xenografts treated with either
enzalutamide or metformin alone or in combination, we demonstrated that metformin
is capable of reversing enzalutamide resistance and restores sensitivity of
CWR22Rv1 xenografts to enzalutamide. We showed that metformin alleviated
resistance to enzalutamide by inhibiting EMT. Furthermore, based on the effect of
metformin on the activation of STAT3 and expression of TGF-?1, we propose that
metformin exerts its effects by targeting the TGF-?1/STAT3 axis. These findings
suggest that combination of metformin with enzalutamide could be a more
efficacious therapeutic strategy for the treatment of castration-resistant
prostate cancer.