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pubmed-article:10220107pubmed:abstractTextA variety of in vitro and in vivo studies demonstrate that dopamine is a toxic molecule that may contribute to neurodegenerative disorders such as Parkinson's disease and ischemia-induced striatal damage. While much attention has focused on the fact that the metabolism of dopamine produces reactive oxygen species (peroxide, superoxide, and hydroxyl radical), growing evidence suggests that the neurotransmitter itself may play a direct role in the neurodegenerative process. Oxidation of the dopamine molecule produces a reactive quinone moiety that is capable of covalently modifying and damaging cellular macromolecules. This quinone formation occurs spontaneously, can be accelerated by metal ions (manganese or iron), and also arises from selected enzyme-catalyzed reactions. Macromolecular damage, combined with increased oxidant stress, may trigger cellular responses that eventually lead to cell death. Reactive quinones have long been known to represent environmental toxicants and, within the context of dopamine metabolism, may also play a role in pathological processes associated with neurodegeneration. The present discussion will review the oxidative metabolism of dopamine and describe experimental evidence suggesting that dopamine quinone may contribute to the cytotoxic and genotoxic potential of this essential neurotransmitter.lld:pubmed
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pubmed-article:10220107pubmed:articleTitleCytotoxic and genotoxic potential of dopamine.lld:pubmed
pubmed-article:10220107pubmed:affiliationCenter for the Neurobiological Investigation of Drug Abuse, Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157-1083, USA.lld:pubmed
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