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Requirement for Wnt and FGF signaling in Xenopus tadpole tail regeneration

Gufa Lin1, Jonathan M W Slack

  • 1Centre for Regenerative Medicine, Department of Biology and Biochemistry, University of Bath, Bath BA2 7AY, UK.

Developmental Biology
|March 11, 2008
PubMed

Insights

Fibroblast Growth Factor (FGF) and Wnt/beta-catenin pathways are crucial for Xenopus tadpole tail regeneration. BMP signaling acts upstream of both Wnt and FGF pathways, influencing regeneration.

Area of Science:

  • Developmental Biology
  • Regenerative Medicine
  • Molecular Biology

Background:

  • Tail regeneration in Xenopus tadpoles is a complex process involving intricate molecular signaling pathways.
  • Understanding the specific roles of Fibroblast Growth Factor (FGF) and Wnt/beta-catenin signaling is key to deciphering regenerative mechanisms.

Purpose of the Study:

  • To investigate the necessity of FGF and Wnt/beta-catenin pathways in Xenopus tadpole tail regeneration.
  • To elucidate the hierarchical relationship between BMP, Wnt, and FGF signaling in tail regeneration.

Main Methods:

  • Utilized small molecule inhibitors (e.g., SU5402, BIO) to modulate pathway activity.
  • Employed heat shock to induce transgene expression, including dominant-negative FGF receptor and Wnt inhibitor Dkk1.
  • Analyzed the effects of pathway manipulation on tail regeneration and growth rates.

Main Results:

  • FGF and Wnt pathway inhibition (SU5402, Dkk1) suppressed tail regeneration.
  • Wnt pathway activation (BIO, constitutively active beta-catenin) enhanced regeneration rate.
  • BMP signaling (via noggin) was found to be upstream of both Wnt and FGF pathways.

Conclusions:

  • Wnt pathway activity appears to lie upstream of FGF pathway activity in tail regeneration.
  • The molecular mechanisms governing Xenopus tadpole tail regeneration share similarities with limb bud and caudal fin regeneration.
  • BMP signaling is a critical upstream regulator of both Wnt and FGF pathways in this regenerative model.

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