Expression of hepatic antioxidant genes in l-thyroxine-induced hyperthyroid rats: regulation by vitamin E and curcumin

Chemico-biological Interactions
U Subudhi, Gagan Bihari Nityananda Chainy

Abstract

Earlier we have demonstrated that oral supplementation of vitamin E and curcumin alleviates hyperthyroidism-induced oxidative stress and distorted histoarchitecture in rat liver [5]. To delineate the underlying mechanism of protection, the present study was undertaken to investigate the regulatory role of vitamin E and curcumin on antioxidant gene (AOG) expression in hyperthyroid rat liver. Adult male rats were rendered hyperthyroid by administration of 0.0012% l-thyroxine in their drinking water, while vitamin E (200mg/kg body weight) and curcumin (30mg/kg body weight) were supplemented orally for 30 days. l-Thyroxine-induced hyperthyroidism decreased the transcript levels of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx1) and glutathione reductase (GR) in liver. Alleviated message levels of SOD and CAT were noticed following simultaneous administration of curcumin and vitamin E to hyperthyroid rats. Moreover vitamin E or curcumin treatment ameliorated GPx1 and GR mRNA levels. Translated products of AOGs showed differential expression in the liver of hyperthyroid rats, where Cu/Zn SOD (SOD1), CAT and GR were decreased in contrast to Mn SOD (SOD2) and GPx1. Vitamin E administration was able to alleviat...Continue Reading

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