title: Effects of supplementation with a combination of cobalt and ascorbic acid on antioxidant enzymes and lipid peroxidation levels in streptozocin-diabetic rat liver.
abstract: The effect of cobalt(II) chloride (CoCl2) and CoCl2 with ascorbic acid (AA) on components of the antioxidant defense system and lipid oxidative damage were studied in controls and streptozotocin-induced diabetic rat livers. Three days after injection, rats received either 0.5 mM CoCl2 or 0.5 mM CoCl2 with a combination of 1 g/L AA in drinking water up to 6 wk. The elevated blood glucose levels in diabetic rats were about 12% restored by oral administration of CoCl2 (0.05 mM) and were significant reduced (46%) following AA addition (1 g/L) to CoCl2. Cobalt therapy effectively decreased the increased activities of catalase (CAT), superoxide dismutase (SOD), and thiobarbituric acid reactant substances (TBARS) but could not restore the increased glutathione peroxidase (GSH-Px) in the liver of diabetic rats. Our findings suggest that cobalt therapy may prove effective in improving the impaired antioxidant status during the early state of diabetes, and ascorbic acid supplementation at this dose potentiates the effectiveness of cobalt action.
authors.affiliation: Department of Biology, Faculty of Science, Ankara University, Ankara, Turkey.
authors.forename: Ozlem
authors.initials: O
authors.lastname: Yildirim
authors.forename: Zeliha
authors.initials: Z
authors.lastname: Büyükbingöl
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D001205:Ascorbic Acid / Q000008:administration & dosage / Q000494:pharmacology*; D001786:Blood Glucose / Q000032:analysis; D002374:Catalase / Q000378:metabolism; D003035:Cobalt / Q000008:administration & dosage / Q000494:pharmacology*; D003921:Diabetes Mellitus, Experimental / Q000201:enzymology / Q000378:metabolism*; D019587:Dietary Supplements; D004357:Drug Synergism; D007275:Injections, Intravenous; D015227:Lipid Peroxidation / Q000187:drug effects*; D008099:Liver / Q000187:drug effects* / Q000201:enzymology* / Q000378:metabolism; D008297:Male; D010084:Oxidation-Reduction / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D013311:Streptozocin; D013482:Superoxide Dismutase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis
chemical_list: D000975:Antioxidants; D001786:Blood Glucose; D017392:Thiobarbituric Acid Reactive Substances; D003035:Cobalt; D013311:Streptozocin; D002374:Catalase; D013482:Superoxide Dismutase; D001205:Ascorbic Acid