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2017 ; 7
(1
): 15918
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gab.com Text
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English Wikipedia
Hypoxia induces epithelial-mesenchymal transition in colorectal cancer cells
through ubiquitin-specific protease 47-mediated stabilization of Snail: A
potential role of Sox9
#MMPMID29162839
Choi BJ
; Park SA
; Lee SY
; Cha YN
; Surh YJ
Sci Rep
2017[Nov]; 7
(1
): 15918
PMID29162839
show ga
During the metastatic phase, cancer cells require the dissolution of
cadherin-mediated cell-cell adhesion and a dramatic re-organization of the
cytoskeleton through epithelial-mesenchymal transition (EMT), thereby acquiring
migratory and invasive capabilities. In most tumors, EMT is accompanied by
hypoxia. However, the intracellular signaling molecule that mediates
hypoxia-induced EMT remained overlooked. By utilizing the microarray database
system of the Cancer Genome Atlas, we identified ubiquitin-specific protease 47
(USP47), a deubiquitinating enzyme, as a potential mediator of hypoxia-induced
EMT. Immunofluorescence staining of human colorectal tissue microarrays revealed
that USP47 is overexpressed in colorectal adenocarcinoma tissues compared with
normal adjacent tissues. The expression of USP47 was found to be elevated in
three different human colorectal cancer cell lines. The enhancement of USP47 in
colorectal cancer cells under hypoxic conditions induced the disassembly of
E-cadherin and promoted EMT through deubiquitination of Snail. Silencing of USP47
accelerated the proteasomal degradation of Snail and inhibited EMT. Notably,
hypoxia-induced USP47 upregulation was mediated by Sox9. These results
demonstrate, for the first time, the role for USP47, as a novel target of Sox9,
in the regulation of EMT and metastasis of colorectal cancer cells.