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Polyaxonal myelination in developing dystrophic and normal mouse nerves.

M J Brown, S J Radich

    Muscle & Nerve
    |May 1, 1979
    PubMed
    Summary
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    Polyaxonal myelination, where one Schwann cell myelinates multiple axons, is rare in normal nerves but significantly increased in dystrophic mice, suggesting a link to myelination failure.

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Peripheral Nervous System Development

    Background:

    • Schwann cells in the peripheral nervous system typically myelinate a single axon, establishing a crucial one-to-one relationship.
    • Polyaxonal myelination, the aberrant myelination of multiple axons by a single Schwann cell, represents a deviation from this norm.

    Purpose of the Study:

    • To investigate the incidence and distribution of polyaxonal myelination in developing normal and dystrophic mouse models.
    • To explore potential causes of polyaxonal myelination, including axonal or Schwann cell abnormalities, or as a response to myelination failure.

    Main Methods:

    • Histological examination of ventral roots, sciatic nerves, and posterior tibial nerves in developing normal mice.
    • Comparative analysis in dy2J/dy2J dystrophic mice exhibiting proximal myelination failure.

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    Main Results:

    • Polyaxonal myelination was observed infrequently in normal developing nerves.
    • Dystrophic mice showed a sixfold increase in polyaxonal myelination compared to normal mice.
    • Polyaxonal myelination was most prevalent in the proximal sciatic nerves of dystrophic mice.

    Conclusions:

    • Increased polyaxonal myelination in dystrophic mice suggests a potential association with underlying myelination defects.
    • This anomaly may arise from intrinsic axonal or Schwann cell defects, or serve as a compensatory response to early myelination failure.