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Is Parkinson's disease a mitochondrial disorder?
Y Nakagawa-Hattori1, H Yoshino, T Kondo
1Department of Neurology, Juntendo University School of Medicine, Tokyo, Japan.
Journal of the Neurological Sciences
|January 1, 1992
Summary
Parkinson's disease (PD) patients show decreased mitochondrial complex I activity in skeletal muscle, unlike in mitochondrial myopathies (MM). This suggests a specific mitochondrial impairment in PD, distinct from MM, despite normal lactate levels.
Area of Science:
- Neuroscience
- Mitochondrial Biology
- Biochemistry
Background:
- Parkinson's disease (PD) etiology remains unknown, but MPTP research highlights potential mitochondrial dysfunction.
- Investigating mitochondrial function is crucial for understanding PD pathogenesis.
- Mitochondrial myopathies (MM) offer a comparative model for studying mitochondrial impairments.
Purpose of the Study:
- To investigate mitochondrial function in Parkinson's disease (PD) patients.
- To compare mitochondrial impairments in PD with those found in mitochondrial myopathies (MM).
- To identify specific mitochondrial deficits in PD.
Main Methods:
- Assay of lactate and pyruvate levels in blood and cerebrospinal fluid (CSF).
- Measurement of skeletal muscle mitochondrial respiratory enzyme activities.
- Southern blot analysis of muscle mitochondrial DNA.
Main Results:
- PD patients exhibited normal lactate and pyruvate levels, both at rest and during exercise, compared to controls.
- A significant decrease in skeletal muscle mitochondrial complex I activity was observed in PD patients.
- No major deletions or insertions in mitochondrial DNA were detected in PD patients via Southern blot analysis.
Conclusions:
- Mitochondrial impairment in PD is distinct from that observed in mitochondrial myopathies (MM).
- Reduced mitochondrial complex I activity in skeletal muscle is a potential biomarker for PD.
- These findings suggest a specific, differential mitochondrial deficit in Parkinson's disease.