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Related Experiment Videos

Identified central axons differ in their response to spinal cord transection.

P S Fishman, J P Kelly

    Brain Research
    |July 2, 1984
    PubMed
    Summary

    Spinal cord injury reveals distinct axon regrowth patterns. Corticospinal axons show limited regrowth, while dorsal column axons display growth cone-like structures, suggesting a structural basis for varied recovery after nerve damage.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Regenerative Medicine

    Background:

    • Axotomy, or nerve severing, triggers cellular responses that determine axon regrowth.
    • Different neuronal populations exhibit varied regenerative capacities following spinal cord injury.
    • Understanding these differences is crucial for developing effective therapeutic strategies.

    Purpose of the Study:

    • To investigate and compare the post-axotomy responses of two distinct neuronal populations in the mouse spinal cord.
    • To characterize the morphological differences in severed axons using anterograde transport of horseradish peroxidase (HRP).
    • To explore the structural basis for differential axon regeneration after spinal cord transection.

    Main Methods:

    • Spinal cord transection was performed in mice.

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  • Horseradish peroxidase (HRP) was used for anterograde axonal labeling.
  • Morphological analysis of severed dorsal root ganglion cell axons and corticospinal neurons was conducted at various time points post-injury.

    • Main Results:

    • Corticospinal axons formed terminal bulbs near the injury site with minimal regrowth.
    • Dorsal column axons exhibited growth cone-like enlargements and occasional outgrowth away from the injury site.
    • Proximal axons near enlargements showed erratic courses and branching, indicating complex regenerative attempts.

    Conclusions:

    • Anterograde HRP transport effectively differentiates axonal responses to injury.
    • Distinct axonal morphologies suggest inherent structural differences influencing spinal cord axon regeneration.
    • These findings provide a structural basis for the observed variability in axon regrowth after spinal cord transection.