Abstract：
:DDX3, a subunit of CK1ε, phosphorylates Dvl2 to promote β-catenin activation. Overexpression of the Dvl2 protein results in potent activation of β-catenin/TCF signaling in colorectal cancer. Therefore, we hypothesized that DDX3 might promote tumor invasion via the CK1ε/Dvl2 axis due to β-catenin/TCF activation. Western blotting showed that β-catenin expression was decreased by DDX3 knockdown and increased by DDX3 overexpression in colorectal cancer cells. The TCF promoter activity and invasion capability were concomitantly increased and decreased by DDX3 manipulation in these cells. The invasion capability in colon cancer cells and xenograft lung tumor nodules induced by a DDX3-overexpressing T84 stable clone in tail-vein injection model were nearly suppressed by inhibitors of CK1ε (PF4800567) and β-catenin/TCF signaling (XAV939). Among colorectal cancer patients, DDX3 expression was positively correlated with the expression of pDvl2 and nuclear β-catenin in tumor tissues. The expression of pDvl2 occurred more frequently in high-nuclear than in low-nuclear β-catenin tumors. A prognostic significance of DDX3, pDvl2, and nuclear β-catenin on overall survival and relapse free survival was observed in this study population. We therefore suggest CK1ε or β-catenin/TCF signaling as potential targets for improving tumor regression and outcomes in colorectal cancer, particularly tumors with high-DDX3/high-nuclear β-catenin or high-DDX3/high-pDvl2/high-nuclear β-catenin expression.
journal_name
Sci Repjournal_title
Scientific reportsauthors
He TY,Wu DW,Lin PL,Wang L,Huang CC,Chou MC,Lee Hdoi
10.1038/srep21483subject
Has Abstractpub_date
2016-02-19 00:00:00pages
21483issn
2045-2322pii
srep21483journal_volume
6pub_type
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