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Protein nitration in Parkinson's disease
1Department of Pathology and the Fishberg Research Center for Neurobiology, The Mount Sinai School of Medicine, New York City, New York 10029-6574, USA.
Journal of Neuropathology and Experimental Neurology
|May 26, 1998
Summary
Oxidative stress markers, specifically nitrotyrosine, were found in brain cells affected by Parkinson's disease (PD). This indicates oxidative damage occurred in neurons, potentially linking PD to other neurodegenerative diseases.
Area of Science:
- Neuroscience
- Pathology
- Biochemistry
Background:
- Oxidative stress is implicated in Parkinson's disease (PD) pathogenesis.
- Protein tyrosine nitration by peroxynitrite is a key oxidative cellular injury mechanism.
- Lewy bodies are characteristic protein aggregates in PD.
Purpose of the Study:
- To investigate the presence and localization of nitrotyrosine immunoreactivity in Parkinson's disease brain tissue.
- To explore the potential link between oxidative stress, protein modification, and neurodegeneration in PD.
Main Methods:
- Immunohistochemistry was used to detect nitrotyrosine.
- Lewy bodies and neuronal deposits in affected neurons were examined.
- Immunolabeling patterns in Lewy body cores and rims were analyzed.
Main Results:
- Nitrotyrosine immunoreactivity was detected in Lewy bodies within melanized neurons.
- Amorphous deposits with nitrotyrosine were found in association with intact and degenerating neurons.
- Intense labeling was observed in Lewy body cores, suggesting nitrotyrosine modification of neurofilament proteins.
Conclusions:
- The findings demonstrate that oxidative stress has occurred in vulnerable neurons in PD, leaving a marker of protein modification.
- Nitrotyrosine presence in Lewy bodies suggests a role for oxidative stress in PD pathogenesis.
- These observations may link excitotoxicity and oxidative stress in PD, a mechanism shared with Alzheimer disease and ALS.