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Related Experiment Videos

Nerve conduction during peripheral demyelination and remyelination.

K J Smith, S M Hall

    Journal of the Neurological Sciences
    |November 1, 1980
    PubMed
    Summary

    Peripheral nerve conduction recovers during remyelination after demyelination, but conduction velocity and impulse spacing remain impaired until full myelin sheath regeneration. Refractory periods of transmission closely track histological recovery.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Pathology

    Background:

    • Peripheral nerve damage involves demyelination and remyelination.
    • Lysophosphatidyl choline (LPC) induces synchronized demyelination in mouse sciatic nerves.
    • Understanding nerve conduction changes during these phases is crucial.

    Purpose of the Study:

    • To correlate histological events with physiological changes during demyelination and remyelination.
    • To investigate nerve fiber conduction properties following LPC-induced nerve injury.
    • To assess the utility of refractory periods of transmission (RPTs) in tracking recovery.

    Main Methods:

    • Intraneural injection of lysophosphatidyl choline (LPC) in mouse sciatic nerves.
    • Monitoring of morphological changes (demyelination, remyelination, Schwann cell association).

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  • Electrophysiological assessment of nerve conduction velocity and RPTs.

    • Main Results:

    • Conduction block occurred during demyelination and persisted for 1-2 days post-demyelination.
    • Conduction partially restored before remyelination, with low conduction velocity and impaired impulse spacing.
    • Full recovery of impulse spacing and increasing conduction velocity observed during remyelination, with thinner/shorter internodes.
    • RPTs correlated well with histological events and behavioral deficits.

    Conclusions:

    • Nerve conduction recovery is a phased process, with RPTs serving as a sensitive indicator of functional recovery.
    • Partial recovery precedes full remyelination, highlighting the role of Schwann cell-axon interactions.
    • Remodeled myelin sheaths (thinner, shorter internodes) may influence long-term nerve function.