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Model neuromelanins as antioxidative agents during lipid peroxidation

Neurotoxicity Research volume 1, pages 141–147 (1999)Cite this article

Abstract

The oxidative pathway of dopamine metabolism in the human brain leads to formation and accumulation of neuromelanin in the cytoplasm of most nigrostriatal dopaminergic neurons. The physiological significance of neuromelanin and its contribution to the neurodegenerative processes underlying Parkinson’s disease are still controversial.

The effect of model neuromelanins on Fe(II)/ascorbate-induced lipid peroxidation in micelles of linoleic acid and in lecithin liposomes was determined. Synthetic neuromelanins were obtained from dopamine (DA), 5-S-cysteinyldopamine (CysDA) or from equimolar mixture of these precursors. Thiobarbituric acid test and reverse-phase HPLC, used for measurements of primary and secondary oxidation products, showed that all melanins tested significantly suppressed peroxidation of both, linoleic acid and liposomal lecithin. The inhibitory effect of CysDA-melanin was lower than of DA/CysDA-melanin and DA-melanin. All the melanins were able to reduce linoleic acid hydroperoxides to their stable hydroxy derivatives. The results obtained suggest that neuromelanin can act as natural antioxidant. The fatty acid hydroperoxide-reducing ability demonstrated for the model neuromelanins appears to be involved in the mechanism of antioxidative activity of neuromelanin.

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Affiliations

  1. Department of Molecular Biology, Biochemistry and Biopharmacy, Medical University of Silesia, Narcyzow 1, 41-200, Sosnowiec, Poland

    Tadeusz Wilczok, Krystyna Stepien, Anna Dzierzega-Lecznar, Alicja Zajdel & Adam Wilczok

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  1. Tadeusz Wilczok
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  2. Krystyna Stepien
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  3. Anna Dzierzega-Lecznar
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  4. Alicja Zajdel
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  5. Adam Wilczok
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Correspondence to Tadeusz Wilczok.

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Wilczok, T., Stepien, K., Dzierzega-Lecznar, A. et al. Model neuromelanins as antioxidative agents during lipid peroxidation. neurotox res 1, 141–147 (1999). https://doi.org/10.1007/BF03033277

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  • DOI: https://doi.org/10.1007/BF03033277

Keywords

  • Lipid
  • Neuromelanin
  • Peroxidation