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2017 ; 8
(44
): 77241-77253
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CUL4B promotes bladder cancer metastasis and induces epithelial-to-mesenchymal
transition by activating the Wnt/?-catenin signaling pathway
#MMPMID29100384
Mao XW
; Xiao JQ
; Xu G
; Li ZY
; Wu HF
; Li Y
; Zheng YC
; Zhang N
Oncotarget
2017[Sep]; 8
(44
): 77241-77253
PMID29100384
show ga
Increased expression of cullin 4B (CUL4B) is linked to progression in several
cancers. This study aims to explore the effects of CUL4B on bladder cancer (BC)
metastasis and epithelial-to-mesenchymal transition (EMT) and potential
correlation to the Wnt/?-catenin signaling pathway. We collected BC tissues and
adjacent normal tissues from 124 BC patients. Quantitative real-time polymerase
chain reaction (qRT-PCR) and western blotting were employed in order to detect
the expression of Wnt/?-catenin signaling pathway-related proteins and EMT
markers. MTT and Transwell assays were used in order to measure cell
proliferation, migration, and invasion. BC 5637 cells were transfected with
control, siRNA scramble control (siRNA-NC), si-CUL4B, and CUL4B or Wnt inhibitory
factor 1 (WIF-1) overexpression constructs. Levels of CUL4B mRNA and protein were
increased in BC tissues in comparison with the adjacent normal tissues. CUL4B
expression was negatively correlated with the expression of E-cadherin and
positively correlated to the expression of N-cadherin and Vimentin. Compared to
the control group, levels of ?-catenin, cyclinD1, c-myc, MMP7, and EMT markers
were reduced, whereas phosphorylated GSK3?(Ser9) and E-cadherin levels were
increased in the si-CUL4B and WIF-1 groups. In addition, cell proliferation,
migration, and invasion abilities were also increased. Increasing CUL4B
expression had the opposite effect. These findings suggest that CUL4B induces EMT
and promotes metastasis of BC by activating the Wnt/?-catenin signaling pathway.