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Related Experiment Videos

Sprouting and synapse formation produced by Carbocaine.

M Tal, S Rotshenker

    The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
    |February 1, 1984
    PubMed
    Summary

    Muscle target denervation triggers nerve growth signals. This study suggests muscle fibers regulate motor neuron growth, challenging prior transneuronal signaling theories for nerve regeneration after injury.

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    P2 receptors in satellite glial cells in trigeminal ganglia of mice.

    Neuroscience·2003

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Regenerative Medicine

    Background:

    • Axotomy (nerve injury) in motor neurons can trigger compensatory nerve sprouting and synapse formation in intact homologous nerves.
    • Previous hypotheses proposed transneuronal signaling across the spinal cord from injured to intact motor neurons initiated growth.
    • An alternative hypothesis suggested axotomy might deprive neuronal cell bodies of muscle-derived trophic factors.

    Purpose of the Study:

    • To test the hypothesis that nerve injury signals growth by reducing trophic substance from target muscles.
    • To investigate the role of muscle-derived trophic substances in regulating motor neuron growth after injury.

    Main Methods:

    • Selective removal of superficial muscle fibers in the frog's cutaneous pectoris muscle using the myotoxic anesthetic Carbocaine.
    • Observation and analysis of nerve sprouting and synaptogenesis patterns in both treated and contralateral intact muscles.

    Main Results:

    • Increased supernumerary innervation was observed first in the drug-treated muscles.
    • This pattern of enhanced innervation subsequently appeared in the contralateral intact muscles.
    • Results indicate a muscle-derived factor influences motor neuron growth signaling.

    Conclusions:

    • Target muscle fibers may play a crucial role in regulating growth signals within motor neuron cell bodies.
    • This challenges the exclusive reliance on transneuronal signaling for compensatory nerve growth after injury.
    • Findings suggest a potential mechanism for muscle-derived trophic factors in neural plasticity and regeneration.

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