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A role for myelin-associated peroxisomes in maintaining paranodal loops and axonal integrity

Celia M Kassmann1, Susanne Quintes, Jens Rietdorf

  • 1Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany.

FEBS Letters
|May 31, 2011
PubMed

Insights

Peroxisomes are crucial for maintaining peripheral myelin integrity and long-term axonal health in demyelinating diseases. Disrupting peroxisome function leads to myelin instability and nerve damage.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathology

Background:

  • Demyelinating diseases cause axon loss through poorly understood mechanisms.
  • Myelin-forming glia, like Schwann cells, are essential for nerve insulation and function.

Purpose of the Study:

  • To investigate the role of peroxisomes in myelinating glia.
  • To understand the mechanisms underlying axon loss in demyelinating neuropathies.

Main Methods:

  • Confocal and electron microscopy were used to examine peroxisome association with myelin.
  • Peroxisome biogenesis was experimentally perturbed in Pex5 conditional mouse mutants.

Main Results:

  • Peroxisomes were found to be associated with myelin membranes in glia.
  • Initial myelination appeared normal in Pex5 mutant mice.
  • Older mutant mice developed unstable paranodal loops with vesicular swellings, indicating a novel demyelinating neuropathy.

Conclusions:

  • Peroxisomes play a critical role in the peripheral myelin compartment.
  • Peroxisome function is essential for maintaining long-term axonal integrity in the peripheral nervous system.

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