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Related Experiment Videos

Axonal atrophy: the retraction reaction.

M Bernstein1, J W Lichtman

  • 1Department of Anatomy and Neurobiology, Box 8108, Washington University School of Medicine, 660 South Euclid Avenue, St Louis, Missouri 63110,USA. bernstem@medicine.wustl.edu

Current Opinion in Neurobiology
|July 8, 1999
PubMed
Summary

Developing and adult axons show similar retraction patterns when target cells are removed. This suggests axons withdraw from cells that no longer provide essential support.

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Area of Science:

  • Neuroscience
  • Developmental Biology

Background:

  • Axon pruning is a critical process during neural development.
  • Adult axons can also undergo retraction in response to target cell loss.

Purpose of the Study:

  • To compare the morphological changes of axon branches during normal development with those following target cell ablation in adults.
  • To investigate the underlying mechanisms of axon withdrawal.

Main Methods:

  • Comparative morphological analysis of axon branches.
  • Observation of axon retraction following postsynaptic cell ablation.

Main Results:

  • Axon branches retract rather than degenerate in both developmental pruning and target-deprived adult scenarios.
  • Withdrawing axon branches exhibit reduced caliber and form spherical swellings at their terminations.

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Conclusions:

  • Axon withdrawal mechanisms are conserved between developing and adult nervous systems.
  • Axon retraction is a response to the loss of trophic support from target cells.