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Mitochondrial dysfunction in neurodegenerative disorders

A H Schapira1

  • 1University Department of Clinical Neurosciences, Royal Free Hospital School of Medicine and University Department of Clinical Neurology, Institute of Neurology, Rowland Hill Street, London NW3 2PF, UK. schapira@rfhsm.ac.uk

Biochimica Et Biophysica Acta
|August 26, 1998
PubMed
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Mitochondrial DNA (mtDNA) mutations cause various disorders, including neurodegenerative diseases like Parkinson's. Mitochondrial dysfunction and oxidative stress are key factors in these conditions, offering targets for neuroprotection.

Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Mitochondrial DNA (mtDNA) mutations are linked to diverse disorders, including myopathies, encephalopathies, cardiomyopathies, diabetes, and deafness.
  • Impaired oxidative phosphorylation is a common pathway for mtDNA-related diseases.
  • Mitochondria's role in neurodegenerative diseases, particularly Parkinson's disease (PD), is increasingly recognized, with evidence suggesting mtDNA abnormalities contribute to complex I deficiency in some PD patients.

Purpose of the Study:

  • To explore the role of mitochondrial dysfunction and oxidative stress in neurodegenerative diseases.
  • To investigate the link between mtDNA abnormalities and respiratory chain defects in PD, Huntington's disease (HD), and Friedreich's ataxia (FA).
  • To identify mitochondria as a potential therapeutic target for neuroprotection.

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Main Methods:

  • Biochemical analysis of platelet and cybrid complex I function to identify PD patients with mtDNA-related complex I defects.
  • Review of evidence linking mitochondrial dysfunction, oxidative stress, and neurodegeneration in PD, HD, and FA.
  • Examination of the impact of impaired oxidative phosphorylation and free radical generation on mitochondrial transmembrane potential (Deltapsim) and the apoptotic pathway.

Main Results:

  • mtDNA abnormalities may cause complex I defects in a subset of PD patients.
  • Respiratory chain defects (complex II/III in HD, complex I-III in FA) are secondary to nuclear mutations but target mitochondria.
  • Mitochondrial dysfunction, oxidative stress, and a fall in Deltapsim contribute to neuronal cell damage and apoptosis in neurodegenerative disorders.

Conclusions:

  • Mitochondrial dysfunction is a significant factor in the pathogenesis of neurodegenerative diseases like PD, HD, and FA.
  • Oxidative stress and impaired mitochondrial function can lower the apoptotic threshold in neurons, leading to cell death.
  • Mitochondria represent a promising target for developing neuroprotective strategies to prevent or slow neurodegeneration.