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2017 ; 13
(5
): 3239-3246
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TGF-?1 signaling pathway serves a role in HepG2 cell regulation by affecting the
protein expression of PCNA, gankyrin, p115, XIAP and survivin
#MMPMID28529566
Wang XH
; Chen ZG
; Xu RL
; Lv CQ
; Liu J
; Du B
Oncol Lett
2017[May]; 13
(5
): 3239-3246
PMID28529566
show ga
The transforming growth factor-? (TGF-?) signaling pathway serves a key role in
the pathogenesis of liver cancer. To investigate the association between TGF-?1
and the following proteins: Proliferating cell nuclear antigen (PCNA), gankyrin,
general vesicular transport factor p115 (p115), X-linked inhibitor of apoptosis
protein (XIAP) and survivin, HepG2 liver cancer cells were transfected with small
interfering RNA (siRNA) directed against TGF-?1, or were treated with exogenous
TGF-?1. TGF-?1 protein expression levels were assessed at 72 and 96 h using
western blotting, cell growth was evaluated using a Cell Counting kit-8 assay,
and flow cytometry was used to examine cell cycle distribution and apoptosis. In
addition, PCNA, gankyrin, p115, XIAP and survivin protein levels were evaluated
using western blotting. TGF-?1 protein expression levels were decreased at 72 and
96 h following siRNA transfection, indicating that the siRNA against TGF-?1 was
effective. In the TGF-?1-knockdown group, the HepG2 cells exhibited G(1) or
S-phase cell cycle arrest; therefore, the number of G(2)-phase cells was
decreased, cell growth was inhibited and apoptotic peaks were observed. By
contrast, no significant alteration in cell cycle distribution or apoptosis was
observed in the cells treated with exogenous TGF-?1. In the exogenous TGF-?1
group, PCNA and XIAP protein expression levels were increased, whereas gankyrin,
p115 and survivin protein expression was observed to be dependent on the duration
of treatment. By contrast, PCNA, gankyrin, XIAP and survivin protein expression
decreased following TGF-?1 knockdown; however, p115 protein expression increased.
In conclusion, the TGF-?1 signaling pathway may affect cell growth, cell cycle
distribution and apoptosis through the regulation of PCNA, gankyrin, p115, XIAP
and survivin protein expression in liver cancer. The results of the present study
may improve the current understanding of the role of the TGF-? signaling pathway
during the pathogenesis of liver cancer.