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Excitotoxicity and nitric oxide in Parkinson's disease pathogenesis
1Neurochemistry Laboratory, Neurology Service, Massachusetts General Hospital and Harvard Medical School, Boston 02114, USA.
Annals of Neurology
|September 28, 1998
Summary
Parkinson's disease may involve excitotoxicity due to mitochondrial defects. Inhibiting neuronal nitric oxide synthase shows neuroprotection, suggesting potential treatments for Parkinson's disease.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Parkinson's disease (PD) pathogenesis may involve excitotoxicity.
- Mitochondrial complex I defects impair oxidative phosphorylation, increasing excitotoxicity vulnerability.
- Substantia nigra neurons are susceptible to excitotoxicity via N-methyl-D-aspartate receptors and glutamatergic inputs.
Purpose of the Study:
- To investigate the role of excitotoxic processes in Parkinson's disease.
- To evaluate the neuroprotective potential of targeting excitotoxicity pathways.
Main Methods:
- Examined mitochondrial complex I activity in PD.
- Investigated the effects of inhibiting neuronal nitric oxide (NO) synthase on neurotoxicity.
- Assessed the efficacy of excitatory amino acid receptor antagonists.
Main Results:
- Mitochondrial complex I defects enhance vulnerability to excitotoxicity.
- Inhibition of neuronal NO synthase demonstrated neuroprotective effects in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine models.
- Excitatory amino acid receptor antagonists showed significant neuroprotection in primates.
Conclusions:
- Excitotoxic processes are implicated in Parkinson's disease.
- Targeting neuronal nitric oxide synthase and excitatory amino acid receptors may offer therapeutic strategies for PD.