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ZFIN ID: ZDB-PUB-100730-13
Wnt5b-Ryk pathway provides directional signals to regulate gastrulation movement
Lin, S., Baye, L.M., Westfall, T.A., and Slusarski, D.C.
Date: 2010
Source: The Journal of cell biology 190(2): 263-278 (Journal)
Registered Authors: Baye, Lisa, Slusarski, Diane C.
Keywords: none
MeSH Terms:
  • Animals
  • Calcium/metabolism
  • Cell Movement/physiology*
  • Cells, Cultured
  • Coculture Techniques
  • Embryo, Nonmammalian/anatomy & histology
  • Embryo, Nonmammalian/physiology
  • Frizzled Receptors/genetics
  • Frizzled Receptors/metabolism
  • Gastrulation*
  • Gene Expression Profiling
  • Humans
  • Phenotype
  • Receptor Protein-Tyrosine Kinases/genetics
  • Receptor Protein-Tyrosine Kinases/metabolism*
  • Receptors, G-Protein-Coupled/genetics
  • Receptors, G-Protein-Coupled/metabolism
  • Recombinant Fusion Proteins/genetics
  • Recombinant Fusion Proteins/metabolism
  • Signal Transduction/physiology*
  • Wnt Proteins/genetics
  • Wnt Proteins/metabolism*
  • Zebrafish/embryology*
  • Zebrafish/metabolism
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism*
PubMed: 20660632 Full text @ J. Cell Biol.
Noncanonical Wnts are largely believed to act as permissive cues for vertebrate cell movement via Frizzled (Fz). In addition to Fz, Wnt ligands are known to regulate neurite outgrowth through an alternative receptor related to tyrosine kinase (Ryk). However, Wnt-Ryk signaling during embryogenesis is less well characterized. In this study, we report a role for Wnt5b as an instructive cue to regulate gastrulation movements through Ryk. In zebrafish, Ryk deficiency impairs Wnt5b-induced Ca(2+) activity and directional cell movement. Wnt5b-Ryk signaling promotes polarized cell protrusions. Upon Wnt5b stimulation, Fz2 but not Ryk recruits Dishevelled to the cell membrane, suggesting that Fz2 and Ryk mediate separate pathways. Using co-culture assays to generate directional Wnt5b cues, we demonstrate that Ryk-expressing cells migrate away from the Wnt5b source. We conclude that full-length Ryk conveys Wnt5b signals in a directional manner during gastrulation.