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  • Title: Axin, an inhibitor of the Wnt signalling pathway, interacts with beta-catenin, GSK-3beta and APC and reduces the beta-catenin level.
    Author: Nakamura T, Hamada F, Ishidate T, Anai K, Kawahara K, Toyoshima K, Akiyama T.
    Journal: Genes Cells; 1998 Jun; 3(6):395-403. PubMed ID: 9734785.
    Abstract:
    BACKGROUND: The Wnt/Wingless signalling pathway plays an important role in both embryonic development and tumorigenesis. Beta-catenin and Axin are positive and negative effectors of the Wnt signalling pathway, respectively. RESULTS: We found that Axin interacts with beta-catenin and glycogen synthase kinase-3beta (GSK-3beta). Furthermore, the regulation of the G-protein signalling (RGS) domain of Axin is associated with the colorectal tumour suppressor adenomatous polyposis coli (APC). Overexpression of Axin in the human colorectal cancer cell line SW480 induced a drastic reduction in the level of -catenin. Interaction with beta-catenin and GSK-3beta was required for the Axin-mediated beta-catenin reduction. CONCLUSION: Axin interacts with beta-catenin, GSK-3beta and APC, and negatively regulates the Wnt signalling pathway, presumably by regulating the level of beta-catenin.
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