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Axonal underdevelopment from axotomy in kittens.

D Jorgensen, P J Dyck

    Journal of Neuropathology and Experimental Neurology
    |November 1, 1979
    PubMed
    Summary
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    Hind limb amputation in kittens prevents myelinated fibers (MFs) from reaching adult size. Axonal development continues post-amputation but does not reach full adult potential, unlike in adult cats.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Regenerative Medicine

    Background:

    • Permanent axotomy in adult animals typically leads to axonal atrophy.
    • Understanding axonal development post-injury in immature nervous systems is crucial for therapeutic strategies.

    Purpose of the Study:

    • To investigate the long-term effects of permanent axotomy on myelinated fiber development in kittens.
    • To compare axonal development post-axotomy in immature versus mature animals.

    Main Methods:

    • Morphometric evaluation of ventral and dorsal root myelinated fibers (MFs) 9 months after hind limb amputation in kittens.
    • Comparison of fiber spectra from amputated roots with those from kittens at the time of amputation.

    Main Results:

    Related Experiment Videos

    • Myelinated fibers (MFs) failed to attain adult calibers post-amputation.
    • Median diameter and peak diameter positions shifted to smaller values, more pronounced in dorsal roots.
    • Axonal development continued post-amputation, indicated by larger diameters compared to pre-amputation levels, especially in motor fibers.
    • Unlike adult cats where axotomy causes atrophy, kittens showed continued but incomplete axonal development.

    Conclusions:

    • Axonal development in kittens post-axotomy continues but is significantly curtailed, failing to reach adult values.
    • The delayed attainment of adult caliber suggests a slow response of perikarya to signals for decreased protein synthesis or slow axonal transport.
    • Findings highlight critical differences in neural plasticity between developing and mature nervous systems following injury.