Nuclear GSK-3beta inhibits the canonical Wnt signalling pathway in a beta-catenin phosphorylation-independent manner

  • Caspi M
  • Zilberberg A
  • Eldar-Finkelman H
 et al. 
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Beta-catenin is the central signalling molecule of the canonical Wnt pathway, where it activates target genes in a complex with lymphoid enhancer factor/T-cell factor transcription factors in the nucleus. The regulation of beta-catenin activity is thought to occur via a cytoplasmatic multiprotein complex that includes the serine/threonine kinase glycogen synthase kinase-3beta (GSK-3beta) that phosphorylates beta-catenin, marking it for degradation by the proteasome. Here, we provide evidence showing that GSK-3beta has a nuclear function in downregulating the activity of beta-catenin. Using colorectal cell lines that express a mutant form of beta-catenin, which cannot be phosphorylated by GSK-3beta and ectopically expressed mutant beta-catenin protein, we show that nuclear GSK-3beta functions in a mechanism that does not involve beta-catenin phosphorylation to reduce the levels of Wnt signalling. We show that GSK-3beta enters the nucleus, forms a complex with beta-catenin and lowers the levels of beta-catenin/TCF-dependent transcription in a mechanism that involves GSK-3beta-Axin binding.

Author-supplied keywords

  • Cadherins/metabolism
  • Cell Line
  • Cell Line, Tumor
  • Cell Nucleus/*metabolism
  • Colorectal Neoplasms/*pathology
  • Glycogen Synthase Kinase 3/*metabolism
  • Humans
  • Models, Biological
  • Phosphorylation
  • Proteasome Endopeptidase Complex/metabolism
  • Protein Binding
  • Signal Transduction
  • Transcription, Genetic
  • Wnt Proteins/*metabolism
  • beta Catenin/*metabolism

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  • M Caspi

  • A Zilberberg

  • H Eldar-Finkelman

  • R Rosin-Arbesfeld

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