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

Nature Cell Biology 8, 501-508 (2006).
Funato Y, Michiue T, Asashima M, Miki H.
Division of Cancer Genomics, Institute of Medical Science, University of Tokyo.

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.