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2017 ; 8
(11
): 17593-17609
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The neuroleptic drug pimozide inhibits stem-like cell maintenance and
tumorigenicity in hepatocellular carcinoma
#MMPMID26061710
Chen JJ
; Cai N
; Chen GZ
; Jia CC
; Qiu DB
; Du C
; Liu W
; Yang Y
; Long ZJ
; Zhang Q
Oncotarget
2017[Mar]; 8
(11
): 17593-17609
PMID26061710
show ga
Drug repurposing is currently an important approach for accelerating drug
discovery and development for clinical use. Hepatocellular carcinoma (HCC)
presents drug resistance to chemotherapy, and the prognosis is poor due to the
existence of liver cancer stem-like cells. In this study, we investigated the
effect of the neuroleptic agent pimozide to inhibit stem-like cell maintenance
and tumorigenicity in HCC. Our results showed that pimozide functioned as an
anti-cancer drug in HCC cells or stem-like cells. Pimozide inhibited cell
proliferation and sphere formation capacities in HCC cells by inducing G0/G1
phase cell cycle arrest, as well as inhibited HCC cell migration. Surprisingly,
pimozide inhibited the maintenance and tumorigenicity of HCC stem-like cells,
particularly the side population (SP) or CD133-positive cells, as evaluated by
colony formation, sphere formation and transwell migration assays. Furthermore,
pimozide was found to suppress STAT3 activity in HCC cells by attenuating
STAT3-dependent luciferase activity and down-regulating the transcription levels
of downstream genes of STAT3 signaling. Moreover, pimozide reversed the stem-like
cell tumorigenic phenotypes induced by IL-6 treatment in HCC cells. Further, the
antitumor effect of pimozide was also proved in the nude mice HCC xenograft
model. In short, the anti-psychotic agent pimozide may act as a novel potential
anti-tumor agent in treating advanced HCC.