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Related Experiment Videos

Microtubule stability in severed axons.

L A White1, P W Baas, S R Heidemann

  • 1Department of Physiology, Michigan State University, East Lansing 48824-1101.

Journal of Neurocytology
|December 1, 1987
PubMed
Summary

Axon severing in cat sympathetic nerves and chick sensory neurons did not show significant microtubule depolymerization. Microtubule instability is unlikely to be involved in the axonal response to axotomy.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Cytoskeleton Dynamics

Background:

  • Axotomy, the severing of axons, triggers complex cellular responses in neurons.
  • Microtubules form the structural backbone of axons and are crucial for neuronal function and regeneration.
  • The role of microtubule depolymerization in the immediate response to axotomy remains unclear.

Purpose of the Study:

  • To investigate evidence of extensive microtubule depolymerization in severed axons and neurites.
  • To determine if microtubule instability contributes to the axonal response following axotomy.

Main Methods:

  • Examined severed axons of cat sympathetic nerves using electron microscopy.
  • Analyzed microtubule density in proximal and distal nerve fragments at various time points post-severing.
  • Assessed microtubule array organization in longitudinal sections of severed chick sensory neurites.

Main Results:

  • Microtubule number density remained nearly identical in proximal and distal cat nerve fragments up to 60 minutes after severing.
  • In chick sensory neurites, the distance to the normal microtubule array showed no consistent pattern related to time after transection.
  • No evidence of microtubule stabilization by capping structures at their ends was found.

Conclusions:

  • The study found no significant evidence of extensive microtubule depolymerization following axotomy in the studied models.
  • Results suggest that microtubule instability is unlikely to be a primary factor in the axonal response to axotomy.
  • Axonal microtubules may not be stabilized by capping structures at their ends.

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