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Copper Intoxication; Antioxidant Defenses and Oxidative Damage in Rat Brain

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Abstract

Copper (Cu) is an integral part of many important enzymes involved in a number of vital biological processes. Even though Cu is essential to life, it can become toxic to cells, at elevated tissue concentrations. Oxidative damage due to Cu has been reported in recent studies in various tissues. In this study, we aimed to determine the effect of excess Cu on oxidative and anti-oxidative substances in brain tissue in a rat model. Sixteen male Wistar albino rats were divided into two groups: the control group, which was given normal tap water, and the experimental group, which received water containing Cu in a dose of 1 g/l. All rats were sacrificed at the end of 4 wk, under ether anesthesia. Cu concentration in the liver and in plasma alanine aminotransferase (ALT) and aspartate transaminase (AST) activities were determined. There were multiparameter changes with significant ALT and AST activity elevation and increased liver Cu concentration. In brain tissue, Cu concentration, superoxide dismutase (SOD) activities, malondialdehyde (MDA) levels and glutathione (GSH) concentrations were determined. Brain Cu concentration was significantly higher in rats receiving excess Cu, compared with control rats (p < 0.05). Our results showed that SOD activities and GSH levels in brain tissue of the Cu-intoxicated animals were significantly lower than in the control group (p < 0.01 and p < 0,001, respectively). The brain MDA levels were found to be significantly higher in the experimental group than in the control group (p < 0.001). The present results indicate that excessive Cu accumulation in the brain depressed SOD activities and GSH levels and resulted in high MDA levels in brain homogenate due to the lipid peroxidation induced by the Cu overload.

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Authors and Affiliations

  1. Department of Biophysics, Cerrhpasa Medical Faculty, Istanbul University, 34303, Cerrahpasa, Istanbul, Turkey

    Dervis Ozcelik

  2. Department of Biochemistry, Cerrahpasa Medical Faculty, Istanbul University, 34303, Cerrahpasa, Istanbul, Turkey

    Hafize Uzun

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  1. Dervis Ozcelik
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  2. Hafize Uzun
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Correspondence to Dervis Ozcelik.

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Ozcelik, D., Uzun, H. Copper Intoxication; Antioxidant Defenses and Oxidative Damage in Rat Brain. Biol Trace Elem Res 127, 45–52 (2009). https://doi.org/10.1007/s12011-008-8219-3

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  • DOI: https://doi.org/10.1007/s12011-008-8219-3

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