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Comprehensive Autopsy Program for Individuals with Multiple Sclerosis
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Mitochondrial changes associated with demyelination: consequences for axonal integrity.

Graham R Campbell1, Don J Mahad

  • 1Mitochondrial Research Group, Institute for Ageing and Health, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK.

Mitochondrion
|March 17, 2011
PubMed
Summary
This summary is machine-generated.

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Demyelination, common in multiple sclerosis (MS), makes axons vulnerable. Increased mitochondria in demyelinated axons may be adaptive, but energy deficits are detrimental, suggesting mitochondrial therapies for CNS disorders.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathology

Background:

  • Demyelination, the loss of the myelin sheath, compromises axonal integrity in central nervous system (CNS) disorders like multiple sclerosis (MS).
  • Axonal degeneration is a hallmark of inflammatory and neurodegenerative diseases.
  • Mitochondria are crucial for axonal energy supply, nerve impulse conduction, and structural maintenance.

Purpose of the Study:

  • To review changes in mitochondrial distribution within axons concerning myelin sheath integrity.
  • To propose increased mitochondrial presence post-demyelination as an adaptive response.
  • To explore the implications of mitochondrial dysfunction in demyelinated axons.

Main Methods:

  • Review of existing literature on axonal mitochondrial changes in demyelinating conditions.

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  • Analysis of energy requirements in myelinated versus demyelinated axons based on ion channel and ATPase distribution.
  • Comparison with neuropathological findings in primary mitochondrial disorders.

    • Main Results:

    • Demyelinated and dysmyelinated axons likely have different energy demands compared to myelinated axons.
    • Increased mitochondrial presence in axons following demyelination is proposed as an adaptive mechanism.
    • Energy deficits in demyelinated axons are potentially more damaging than in myelinated axons.

    Conclusions:

    • Mitochondrial changes are critical in the pathophysiology of demyelinating disorders.
    • Therapeutic strategies targeting mitochondrial enhancement and protection warrant investigation for CNS demyelinating diseases like MS.