Antioxidant status in experimental hyperthyrodism: Effect of vitamin E supplementation

Seven A. N. , Seymen O. , Hatemi S., Hatemi H., Yigit G. , Candan G.

CLINICA CHIMICA ACTA, vol.256, no.1, pp.65-74, 1996 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 256 Issue: 1
  • Publication Date: 1996
  • Doi Number: 10.1016/s0009-8981(96)06415-7
  • Title of Journal : CLINICA CHIMICA ACTA
  • Page Numbers: pp.65-74


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 T-4 and T-3 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.