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Manganese neurotoxicity: effects of varying oxygen tension and EDTA on dopamine auto-oxidation

J P Nachtman, S Delor, C E Brennan

    Neurotoxicology
    |January 1, 1987
    PubMed

    Insights

    Excess manganese (Mn) accelerates dopamine oxidation, contributing to parkinsonism. This study shows Mn significantly increases dopamine auto-oxidation rates, especially under oxygen, suggesting a role for reactive oxygen species in Mn-induced neurotoxicity.

    Area of Science:

    • Neuroscience
    • Toxicology
    • Biochemistry

    Background:

    • Manganese (Mn) is essential but toxic in excess, causing parkinsonism.
    • Mn is a potent stimulator of dopamine (DA) auto-oxidation compared to other metals.

    Purpose of the Study:

    • To investigate the effect of manganese on dopamine auto-oxidation rates.
    • To explore the influence of oxygen levels and chelating agents on this process.

    Main Methods:

    • Incubation of manganese and dopamine at 37°C.
    • Measurement of optical density at 480 nm to quantify aminochrome formation.
    • Varying partial pressures of oxygen (pO2) and using EDTA as a chelating agent.

    Main Results:

    • Mn significantly increased DA auto-oxidation rates, particularly under elevated oxygen.
    • Air plus Mn showed a 5-fold greater oxidation rate than air or Mn alone.
    • EDTA reduced Mn-stimulated DA auto-oxidation by 80%.

    Conclusions:

    • Results support the role of activated oxygen metabolites in dopamine depletion during chronic Mn intoxication.
    • Understanding Mn's effect on dopamine oxidation is crucial for neurodegenerative disease research.

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