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2016 ; 7
(24
): 36115-36129
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EZH2-mediated repression of GSK-3? and TP53 promotes Wnt/?-catenin
signaling-dependent cell expansion in cervical carcinoma
#MMPMID27092879
Chen Q
; Zheng PS
; Yang WT
Oncotarget
2016[Jun]; 7
(24
): 36115-36129
PMID27092879
show ga
Enhancer of zeste homolog 2 (EZH2), a catalytic core component of the Polycomb
repressive complex 2 (PRC2), stimulates the silencing of target genes through
histone H3 lysine 27 trimethylation (H3K27me3). Recent findings have indicated
EZH2 is involved in the development and progression of various human cancers.
However, the exact mechanism of EZH2 in the promotion of cervical cancer is
largely unknown. Here, we show that EZH2 expression gradually increases during
the progression of cervical cancer. We identified a significant positive
correlation between EZH2 expression and cell proliferation in vitro and tumor
formation in vivo by the up-regulation or down-regulation of EZH2 using
CRISPR-Cas9-mediated gene editing technology and shRNA in HeLa and SiHa cells.
Further investigation indicated that EZH2 protein significantly accelerated the
cell cycle transition from the G0/G1 to S phase. TOP/FOP-Flash reporter assay
revealed that EZH2 significantly activated Wnt/?-catenin signaling and the target
genes of Wnt/?-catenin pathway were up-regulated, including ?-catenin, cyclin D1,
and c-myc. Moreover, dual-luciferase reporter and chromatin immunoprecipitation
(ChIP) assays confirmed that EZH2 inhibited the expression of glycogen synthase
kinase-3? (GSK-3?) and TP53 through physically interacting with motifs in the
promoters of the GSK-3? and TP53 genes. Additionally, blockage of the
Wnt/?-catenin pathway resulted in significant inhibition of cell proliferation,
and activation of the Wnt/?-catenin pathway resulted in significant enhancement
of cell proliferation, as induced by EZH2. Taken together, our data demonstrate
that EZH2 promotes cell proliferation and tumor formation in cervical cancer
through activating the Wnt/?-catenin pathway by epigenetic silencing via GSK-3?
and TP53.
|Animals
[MESH]
|CRISPR-Cas Systems
[MESH]
|Cell Line, Tumor
[MESH]
|Cell Proliferation/*genetics
[MESH]
|Enhancer of Zeste Homolog 2 Protein/*genetics/metabolism
[MESH]