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    Nat Cell Biol. 2006 May;8(5):501-8. Epub 2006 Apr 2.

    The thioredoxin-related redox-regulating protein nucleoredoxin inhibits Wnt-beta-catenin signalling through dishevelled.

    Funato Y, Michiue T, Asashima M, Miki H.

    Division of Cancer Genomics, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.

    Comment in:

    Dishevelled (Dvl) transduces signals from the Wnt receptor, Frizzled, to downstream components, leading to the stabilization of beta-catenin and subsequent activation of the transcription factor T cell factor (TCF) and/or lymphoid enchancer factor (LEF). However, the mechanism of Dvl action remains unclear. Here, we report that nucleoredoxin (NRX), a thioredoxin (TRX) family protein, interacts with Dvl. Overexpression of NRX selectively suppresses the Wnt-beta-catenin pathway and ablation of NRX by RNA-interference (RNAi) results in activation of TCF, accelerated cell proliferation and enhancement of oncogenicity through cooperation with mitogen-activated extracellular signal regulated kinase kinase (MEK) or Ras. We find that cells respond to H(2)O(2) stimulation by activating TCF. Redox-dependent activation of the Wnt-beta-catenin pathway occurs independently of extracellular Wnts and is impaired by RNAi of NRX . In addition, association between Dvl and NRX is inhibited by H(2)O(2) treatment. These data suggest a relationship between the Wnt-beta-catenin pathway and redox signalling through redox-sensitive association of NRX with Dvl.

    PMID: 16604061 [PubMed - indexed for MEDLINE]

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