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Multiple Sclerosis l: Introduction01:19

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Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...
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Updated: Jul 4, 2026

Comprehensive Autopsy Program for Individuals with Multiple Sclerosis
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Published on: July 19, 2019

Mitochondrial defects in acute multiple sclerosis lesions.

Don Mahad1, Iryna Ziabreva, Hans Lassmann

  • 1The Mitochondrial Research Group, University of Newcastle upon Tyne, UK.

Brain : a Journal of Neurology
|June 3, 2008
PubMed
Summary

Mitochondrial defects, specifically in complex IV (cytochrome c oxidase), are found in some multiple sclerosis lesions, suggesting impaired energy production contributes to hypoxia-like injury in the central nervous system.

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Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Multiple sclerosis (MS) is a chronic CNS inflammatory disease causing demyelination and tissue injury.
  • Distinct lesion patterns suggest varied immune mechanisms and tissue damage pathways in MS.
  • Some MS lesions resemble white matter stroke (WMS), indicating potential hypoxia-like injury.

Purpose of the Study:

  • To investigate the role of mitochondrial injury in specific MS lesion patterns.
  • To compare mitochondrial respiratory chain protein expression in MS lesions and WMS.

Main Methods:

  • Immunohistochemistry was used to analyze mitochondrial respiratory chain proteins in active MS lesions and WMS.
  • Specific focus on mitochondrial complex IV (cytochrome c oxidase, COX) and its catalytic component (COX-I).

Main Results:

  • Defects in COX (complex IV) were identified in Pattern III MS lesions, but not in Pattern II.
  • Lack of COX-I was observed in oligodendrocytes, astrocytes, and axons within these lesions.
  • Mitochondrial protein profiles differed between MS and WMS lesions.

Conclusions:

  • Hypoxia-like tissue injury in Pattern III MS lesions may stem from mitochondrial dysfunction.
  • Mitochondrial impairment is implicated in the pathogenesis of specific MS lesion types.