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Related Experiment Videos

Changes within maturing neurons limit axonal regeneration in the developing spinal cord.

Murray Blackmore1, Paul C Letourneau

  • 1Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455, USA. blac0192@tc.umn.edu

Journal of Neurobiology
|January 13, 2006
PubMed
Summary

Embryonic axon regeneration declines with development. Neuron-intrinsic changes, not just the spinal cord environment, are the primary cause of this lost ability in young birds and mammals.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Regenerative Medicine

Background:

  • Embryonic animals can regenerate spinal cord axons, but lose this capacity during development.
  • Previous theories focused on inhibitory factors in the spinal cord environment, like myelin.

Purpose of the Study:

  • To quantitatively assess the roles of the spinal cord environment and neuron-intrinsic factors in the loss of axon regeneration capacity.
  • To investigate the developmental transition of axon regeneration in embryonic chick hindbrain-spinal projections.

Main Methods:

  • Heterochronic cocultures to compare regeneration in different aged environments.
  • In vivo transplantation of young neurons into older spinal cords.
  • In vitro assays with growth-permissive ligands (laminin, L1, N-cadherin).

Related Experiment Videos

  • Video analysis of growth cone motility.

    • Main Results:

    • Spinal cord maturation reduced regeneration by 55%; hindbrain neuron maturation reduced it by 90%.
    • Young neurons regenerated in older spinal cords, while older axons showed poor regeneration and reduced growth cone motility.
    • Direct observation confirmed an age-dependent decline in brainstem axon motility.

    Conclusions:

    • Developmental changes in both the spinal cord environment and neurons contribute to reduced axon regeneration.
    • Neuron-intrinsic maturational changes are the primary driver, causing a near-complete loss of regeneration capacity.
    • This highlights intrinsic neuronal factors as key targets for promoting spinal cord repair.