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Retinoic acid and limb regeneration.

J P Brockes1

  • 1Ludwig Institute for Cancer Research, London.

Journal of Cell Science. Supplement
|January 1, 1990
PubMed
Summary

Retinoic acid, a vitamin A metabolite, acts as a morphogen in amphibian regeneration. Its concentration-dependent effects on positional value offer insights into vertebrate developmental patterning.

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Area of Science:

  • Developmental Biology
  • Regenerative Medicine
  • Molecular Endocrinology

Background:

  • Understanding the molecular mechanisms of positional value along developmental axes is a fundamental challenge in vertebrate development.
  • Amphibian regeneration provides a model system to study how positional information is established and modified.
  • Retinoic acid, a metabolite of vitamin A, is known to influence developmental processes.

Purpose of the Study:

  • To investigate the role of retinoic acid as an endogenous morphogen in vertebrate development and regeneration.
  • To explore the molecular basis of how retinoic acid specifies positional values in a concentration-dependent manner.
  • To elucidate the mechanism by which retinoic acid mediates its graded effects on morphogenesis.

Main Methods:

  • Studies on amphibian regeneration models.
  • Analysis of retinoic acid concentration gradients.
  • Investigation of nuclear receptor involvement in retinoic acid signaling.

Main Results:

  • Retinoic acid can respecify positional value in a graded manner during amphibian regeneration, directly correlating with its concentration.
  • Evidence suggests retinoic acid functions as an endogenous morphogen in vivo.
  • Retinoic acid's effects are mediated by nuclear receptors belonging to the steroid/thyroid hormone superfamily.

Conclusions:

  • Retinoic acid plays a significant role as a morphogen in vertebrate development and regeneration.
  • The concentration-dependent action of retinoic acid provides a mechanistic basis for understanding graded positional specification.
  • Insights into retinoic acid signaling through nuclear receptors are crucial for comprehending vertebrate axial patterning.

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