Abstract
Manganese (Mn) is an essential trace element which, upon excessive exposure, produces a neurological syndrome similar to chronic Parkinson's disease in animals and humans. Previous work demonstated that Mn was more potent than other transition metals in stimulating dopamine (DA) auto-oxidation. In these experiments, DA was incubated under physiological conditions in the presence and absence of Mn for up to 60 min. 6-Hydroxydopamine (6-OHDA) was produced in the presence of Mn, while the incubation mixture without Mn showed no DA oxidation. 6-Hydroxydopamine is a neurotoxicant which exerts its effects by destroying DA nerve terminals in the CNS. Therefore, this work suggests that the Mn catalyzed increase in DA auto-oxidation could be linked mechanistically to the appearance of Mn-induced neurotoxic effects.
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