Activity of the beta-catenin phosphodestruction complex at cell-cell contacts is enhanced by cadherin-based adhesion

J Cell Biol. 2009 Jul 27;186(2):219-28. doi: 10.1083/jcb.200811108. Epub 2009 Jul 20.

Abstract

It is well established that cadherin protein levels impact canonical Wnt signaling through binding and sequestering beta-catenin (beta-cat) from T-cell factor family transcription factors. Whether changes in intercellular adhesion can affect beta-cat signaling and the mechanism through which this occurs has remained unresolved. We show that axin, APC2, GSK-3beta and N-terminally phosphorylated forms of beta-cat can localize to cell-cell contacts in a complex that is molecularly distinct from the cadherin-catenin adhesive complex. Nonetheless, cadherins can promote the N-terminal phosphorylation of beta-cat, and cell-cell adhesion increases the turnover of cytosolic beta-cat. Together, these data suggest that cadherin-based cell-cell adhesion limits Wnt signals by promoting the activity of a junction-localized beta-cat phosphodestruction complex, which may be relevant to tissue morphogenesis and cell fate decisions during development.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Axin Protein
  • Cadherins / genetics
  • Cadherins / metabolism*
  • Cell Adhesion / physiology*
  • Cells, Cultured
  • Cytoskeletal Proteins / metabolism
  • Glycogen Synthase Kinase 3 / metabolism
  • Glycogen Synthase Kinase 3 beta
  • Humans
  • Intercellular Junctions / metabolism*
  • Keratinocytes / cytology
  • Keratinocytes / metabolism
  • Male
  • Multiprotein Complexes / metabolism*
  • Phosphorylation
  • Rats
  • Rats, Sprague-Dawley
  • Repressor Proteins / metabolism
  • Signal Transduction / physiology*
  • TCF Transcription Factors / metabolism
  • Wnt Proteins / metabolism
  • beta Catenin / genetics
  • beta Catenin / metabolism*

Substances

  • Axin Protein
  • Cadherins
  • Cytoskeletal Proteins
  • Multiprotein Complexes
  • Repressor Proteins
  • TCF Transcription Factors
  • Wnt Proteins
  • adenomatous polyposis coli protein 2
  • beta Catenin
  • GSK3B protein, human
  • Glycogen Synthase Kinase 3 beta
  • Gsk3b protein, rat
  • Glycogen Synthase Kinase 3