Antioxidant status in experimental hyperthyroidism: effect of vitamin E supplementation

Clinica Chimica Acta; International Journal of Clinical Chemistry
A SevenG Candan

Abstract

Free radical-mediated oxidative stress has been implicated in the genesis and exacerbation of degenerative diseases. In view of the role of oxidative processes in hyperthyroidism, in this study, we investigated the antioxidant status of erythrocytes in experimental hyperthyroidism and the effect of vitamin E supplementation on defense systems. Our findings of significantly increased T4 and T3 and undetectable TSH values in thyroxine administered rats confirmed the establishment of hyperthyroidism. Superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and glutathione (GSH) values were found to be significantly increased in hyperthyroid rats in comparison to the control group. Vitamin E supplementation to hyperthyroid rats induced a significant decrease in GSH-Px activity and a significant increase in GSH level. These findings show that hyperthyroidism increases the components of the antioxidant system in the erythrocytes. Furthermore, vitamin E supplementation reduces the burden of oxidative stress in hyperthyroidism.

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Citations

Feb 18, 2004·Clinica Chimica Acta; International Journal of Clinical Chemistry·Vesna Bacic VrcaLjiljana Mayer
Aug 26, 2000·Clinica Chimica Acta; International Journal of Clinical Chemistry·K Komosinska-VassevA Kotulska
May 24, 2003·Clinica Chimica Acta; International Journal of Clinical Chemistry·Levent OztürkNuran Gökhan
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