Abstract
Taurine is an abundant amino acid found in mammalian tissues and it has been suggested to have cyto-protective functions. The aim of the present study was to determine if taurine had the potential to reduce oxidative stress associated with metal-stimulated catecholamine oxidation. Taurine and structural analogs of taurine were tested for their ability to inhibit metal-stimulated quinone formation from dopamine or L-dopa. Oxidative damage to proteins and lipids were also assessedin vitro and the effects of taurine were determined. Taurine (20 mM) was found to decrease significantly ferric iron (50–500 μM)- and manganese (10 μM)-stimulated L-dopa or dopamine oxidation. Taurine had no effect on zinc-induced dopamine oxidation and slightly potentiated copper- and NaIO4-stimulated quinone formation. Ferric iron-stimulated lipid peroxidation was not affected by taurine (1–20 mM). Protein carbonyl formation induced by ferric iron (500 μM) and L-dopa (500 μM) was significantly reduced by 10 mM taurine. The cytotoxicity of L-dopa (250 μM) and ferric chloride (75 μM) to LLC-PK1 cells was attenuated by 10 mM taurine or hypotaurine. Homotaurine alone stimulated L-dopa oxidation and potentiated the cytotoxic effects of ferric iron. Homotaurine was found to be cytotoxic when combined with L-dopa or L-dopa/iron. In contrast, hypotaurine inhibited quinone formation and protected LLC-PK1 cells. These studies suggest that taurine may exhibit cytoprotective effects against the oxidation products of catecholamines by acting as a scavenger for free radicals and cytotoxic quinones.
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Dawson, R., Baker, D., Eppler, B. et al. Taurine inhibition of metal-stimulated catecholamine oxidation. neurotox res 2, 1–15 (2000). https://doi.org/10.1007/BF03033322
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DOI: https://doi.org/10.1007/BF03033322