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2018 ; 9
(2
): 17
Nephropedia Template TP
gab.com Text
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Plumbagin inhibits the proliferation and survival of esophageal cancer cells by
blocking STAT3-PLK1-AKT signaling
#MMPMID29339720
Cao YY
; Yu J
; Liu TT
; Yang KX
; Yang LY
; Chen Q
; Shi F
; Hao JJ
; Cai Y
; Wang MR
; Lu WH
; Zhang Y
Cell Death Dis
2018[Jan]; 9
(2
): 17
PMID29339720
show ga
Esophageal squamous cell carcinoma (ESCC) is one of the deadliest cancers, and it
requires novel treatment approaches and effective drugs. In the present study, we
found that treatment with plumbagin, a natural compound, reduced proliferation
and survival of the KYSE150 and KYSE450 ESCC cell lines in a dose-dependent
manner in vitro. The drug also effectively inhibited the viability of primary
ESCC cells from fresh biopsy specimens. Furthermore, plumbagin-induced mitotic
arrest and massive apoptosis in ESCC cells. Notably, the drug significantly
suppressed the colony formation capacity of ESCC cells in vitro and the growth of
KYSE150 xenograft tumors in vivo. At the molecular level, we found that exposure
to plumbagin decreased both polo-like kinase 1 (PLK1) and phosphorylated protein
kinase B (p-AKT) expression in both ESCC cell lines. Enforced PLK1 expression in
ESCC cells not only markedly rescued cells from plumbagin-induced apoptosis and
proliferation inhibition but also restored the impaired AKT activity.
Furthermore, signal transducer and activator of transcription 3 (STAT3), a
transcription factor of PLK1, was also inactivated in plumbagin-treated ESCC
cells; however, the overexpression of a constitutively activated STAT3 mutant,
STAT3C, reinstated the plumbagin-elicited blockade of PLK1-AKT signaling in ESCC
cells. Taken together, these findings indicate that plumbagin inhibits
proliferation and potentiates apoptosis in human ESCC cells in vitro and in vivo.
Plumbagin may exert these antitumor effects by abrogating STAT3-PLK1-AKT
signaling, which suggests that plumbagin may be a novel, promising anticancer
agent for the treatment of ESCC.