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Dopamine thioethers: formation in brain and neurotoxicity
Kathleen S. Montine1, Kathrin R. Sidell, Jing Zhang
1Department of Pathology, University of Washington, Harborview Medical Center, Box 359791, Seattle, WA 98104, U.S.A.
Neurotoxicity Research
|April 24, 2003
Summary
Oxidized dopamine products metabolized via the mercapturic acid pathway (MAP) may contribute to neurodegeneration. This review examines MAP enzyme localization and the neurotoxicity of dopamine thioether products in the human brain.
Area of Science:
- Neuroscience
- Biochemistry
- Toxicology
Background:
- Dopamine (DA) oxidation is implicated in neurodegenerative diseases.
- The precise mechanisms linking DA oxidation to neurodegeneration remain unclear.
- Emerging evidence suggests metabolites of oxidized DA might play a role.
Purpose of the Study:
- To review the localization of mercapturic acid pathway (MAP) enzymes in the human brain.
- To assess the concentration and neurotoxicity of dopamine thioether products.
- To elucidate the role of MAP in DA-related neurodegeneration.
Main Methods:
- Review of existing literature on MAP enzyme localization in human brain tissue.
- Analysis of studies reporting concentrations of DA thioether metabolites.
- Examination of in vitro and in vivo data on the neurotoxicity of DA thioether products.
Main Results:
- MAP enzymes are present in key brain regions affected by neurodegeneration.
- Specific DA thioether metabolites are found in the brain.
- These metabolites exhibit varying degrees of neurotoxic potential.
Conclusions:
- The mercapturic acid pathway is active in the human brain and processes oxidized dopamine.
- DA thioether metabolites represent a potential mechanism contributing to dopaminergic neurodegeneration.
- Further research is warranted to fully understand the contribution of MAP to neurodegenerative processes.