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Related Experiment Videos

Mitochondrial dysfunction in adult-onset myopathies with structural abnormalities

M Naumann1, K Reiners, R Gold

  • 1Department of Neurology, University of Würzburg, Germany.

Acta Neuropathologica
|January 1, 1995
PubMed
Summary

This study found that mitochondrial dysfunction is common in patients with chronic progressive external ophthalmoplegia, generalized muscle atrophy, and myalgia. These findings suggest mitochondrial disorders may play a significant role in these myopathies.

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Area of Science:

  • Neurology
  • Mitochondrial Medicine
  • Muscle Diseases

Background:

  • Chronic progressive external ophthalmoplegia (CPEO) with adult-onset generalized muscle atrophy and myalgia is a rare condition.
  • Histological examination can reveal centronuclear myopathy or fiber-type disproportion.
  • Ragged red fibers and cytochrome c oxidase deficiency are indicative of mitochondrial abnormalities.

Observation:

  • Three patients with CPEO, muscle atrophy, and myalgia presented with ragged red fibers and subsarcolemmal mitochondrial accumulation.
  • Muscle biopsies showed cytochrome c oxidase negative fibers and increased subsarcolemmal mitochondria.
  • Patients underwent comprehensive investigations including biochemical, genetic, and spectroscopic analyses.

Findings:

  • Biochemical analysis of the respiratory chain suggested additional mitochondrial dysfunction in all patients.

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  • Molecular genetics and magnetic resonance spectroscopy further supported the presence of mitochondrial impairment.
  • Ergometry results were consistent with an underlying mitochondrial disorder.

    • Implications:

    • Mitochondrial dysfunction appears to be more prevalent in this group of myopathies than previously recognized.
    • These findings highlight the importance of considering mitochondrial disorders in the pathogenesis of CPEO with muscle atrophy and myalgia.
    • Further research is warranted to elucidate the precise mechanisms linking mitochondrial dysfunction to these specific myopathies.