title: Thyroxine induced stress and its possible prevention by catechin.
abstract: Free radicals are all known to damage cell components. The present study was designed to evaluate the free radical generation in the testis and liver and also to determine the testicular and hepatic antioxidant enzyme activities with and without catechin administration in thyroxine induced male Sprague-Dawley rats. The experimental animals were divided into four groups, six on each division. L-thyroxine (T4) (0.3 mg/kg body weight) was administered to experimental groups for 15 days. Another group (CAT-T4) was administered with L-thyroxine (T4) in the dose as mentioned and catechin (100 mg/kg of body weight/day) simultaneously. Third group was administered only with catechin, and the remaining group was kept as control. Lipid peroxidation level (LPO) increased in L-thyroxine treated rats as compared to control, while LPO level was almost normal in L-thyroxine (T4) and catechin (CAT-T4) treated group. Superoxide dismutase (SOD) and catalase activities were increased in L-thyroxine (T4) treated rats as compared to control, where as there were almost at normal level in L-thyroxine (T4) and catechin (CAT-T4) treated groups. The results show that, thyroxine administration develops oxidative stress; the organism defends it against the effects of oxidative stress by increasing SOD and catalase activities as a protective mechanism and catechin, being an antioxidant, normalizes lipid peroxidation in testis and liver including SOD and catalase activities.
authors.affiliation: Endocrinology and Reproductive Physiology Laboratory, Department of Physiology, University College of Science and Technology, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata 700 009, India. amark_chandra@yahoo.co.in
authors.forename: Amar K
authors.initials: AK
authors.lastname: Chandra
authors.forename: Sabyasachi
authors.initials: S
authors.lastname: Sinha
authors.forename: Shyamosree Roy
authors.initials: SR
authors.lastname: Choudhury
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D002392:Catechin / Q000494:pharmacology*; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects; D008297:Male; D018384:Oxidative Stress / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013482:Superoxide Dismutase / Q000378:metabolism; D013737:Testis / Q000187:drug effects; D013974:Thyroxine / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D002392:Catechin; D002374:Catalase; D013482:Superoxide Dismutase; D013974:Thyroxine