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Amphibian limb regeneration: rebuilding a complex structure

J P Brockes1

  • 1Ludwig Institute for Cancer Research and Department of Biochemistry and Molecular Biology, University College London, 91 Riding House Street, London W1P 8BT, UK. jerbro@ludwig.ucl.ac.uk

Science (New York, N.Y.)
|April 4, 1997
PubMed
Summary

Urodele amphibians possess exceptional limb regeneration capabilities, forming a blastema from differentiated cells that reenter the cell cycle. Understanding urodele regeneration mechanisms may offer insights into mammalian limb regrowth potential.

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Area of Science:

  • Developmental Biology
  • Regenerative Medicine
  • Comparative Vertebrate Anatomy

Background:

  • Complex structure regeneration is common in metazoans, yet rare in vertebrates.
  • Urodele amphibians exhibit remarkable limb regeneration abilities in adults.
  • Limb regeneration involves a mesenchymal growth zone, or blastema, formation.

Purpose of the Study:

  • To explore the mechanisms underlying urodele limb regeneration.
  • To investigate the cellular and molecular basis of blastema formation and axial identity.
  • To assess the potential for inducing regeneration in non-regenerating vertebrates, like mammals.

Main Methods:

  • Analysis of blastema formation following amputation or wounding.
  • Investigation of cell cycle re-entry from differentiated states.

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  • Study of proximodistal identity specification within the blastema.
  • Exploration of molecular signaling pathways, including retinoic acid signaling.

    • Main Results:

    • Blastemal cells are generated from differentiated cells capable of cell cycle re-entry.
    • The blastema restores structures based on its proximodistal position.
    • Axial identity appears to be a graded property influencing cell behavior.
    • Retinoic acid receptor signaling may play a role in respecifying proximodistal identity.

    Conclusions:

    • Urodele limb regeneration is a complex process involving blastema formation and cell cycle dynamics.
    • Positional information and molecular signaling, such as retinoic acid, are crucial for regeneration.
    • While mammalian limb regeneration is currently limited, understanding urodele mechanisms offers potential future avenues.