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- W2034373020 abstract "A Xenopus laevis two-reporter screen identifies the antihelminthic drug pyrvinium as an inhibitor of the Wnt/β-catenin signaling pathway that works by activating CK1α, which is likely working at the level of Pygopus, a core transcriptional component of the Wnt pathway. Wnt/β-catenin signaling is critically involved in metazoan development, stem cell maintenance and human disease. Using Xenopus laevis egg extract to screen for compounds that both stabilize Axin and promote β-catenin turnover, we identified an FDA-approved drug, pyrvinium, as a potent inhibitor of Wnt signaling (EC50 of ∼10 nM). We show pyrvinium binds all casein kinase 1 (CK1) family members in vitro at low nanomolar concentrations and pyrvinium selectively potentiates casein kinase 1α (CK1α) kinase activity. CK1α knockdown abrogates the effects of pyrvinium on the Wnt pathway. In addition to its effects on Axin and β-catenin levels, pyrvinium promotes degradation of Pygopus, a Wnt transcriptional component. Pyrvinium treatment of colon cancer cells with mutation of the gene for adenomatous polyposis coli (APC) or β-catenin inhibits both Wnt signaling and proliferation. Our findings reveal allosteric activation of CK1α as an effective mechanism to inhibit Wnt signaling and highlight a new strategy for targeted therapeutics directed against the Wnt pathway." @default.
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- W2034373020 date "2010-10-03" @default.
- W2034373020 modified "2023-10-18" @default.
- W2034373020 title "Small-molecule inhibition of Wnt signaling through activation of casein kinase 1α" @default.
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- W2034373020 doi "https://doi.org/10.1038/nchembio.453" @default.
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