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Mitochondrial complex I deficiency in Parkinson's disease.
A H Schapira1, J M Cooper, D Dexter
1Department of Neurological Science, Royal Free Hospital School of Medicine, London, England.
Journal of Neurochemistry
|March 1, 1990
Summary
Parkinson's disease patients show reduced Complex I activity in the substantia nigra, a specific mitochondrial defect. This finding supports the theory that Parkinson's may be caused by an environmental toxin similar to MPTP.
Area of Science:
- Neuroscience
- Biochemistry
- Mitochondrial Biology
Background:
- Parkinson's disease is a neurodegenerative disorder affecting motor function.
- Mitochondrial dysfunction is implicated in the pathogenesis of Parkinson's disease.
Purpose of the Study:
- To investigate mitochondrial respiratory-chain enzyme protein function in the substantia nigra of Parkinson's disease patients.
- To determine if specific enzyme defects correlate with Parkinson's disease pathology.
Main Methods:
- Postmortem analysis of substantia nigra tissue from Parkinson's disease patients and controls.
- Assay of mitochondrial respiratory-chain enzyme activities, including NADH-ubiquinone reductase (Complex I).
Main Results:
- Total protein and mitochondrial mass were comparable between groups.
- Significant reduction in NADH-ubiquinone reductase (Complex I) and NADH cytochrome c reductase activities in Parkinson's disease patients.
- Normal succinate cytochrome c reductase activity was observed.
Conclusions:
- A specific defect in Complex I activity exists in the substantia nigra of Parkinson's disease patients.
- This defect mirrors biochemical changes seen in MPTP-induced parkinsonism models.
- Findings support the hypothesis that an environmental toxin, similar to MPTP, may contribute to Parkinson's disease.