title: Nitric oxide synthase inhibition by L-NAME in streptozotocin induced diabetic rats: impacts on oxidative stress.
abstract: The effects of nitric oxide synthase (NOS) inhibition by Nw-nitro-L-arginine methyl ester (L-NAME) administration on oxidative stress parameters were investigated in streptozotocin (STZ) induced diabetic rats. Lipid peroxidation as reflected by thiobarbituric acid reactive substances (TBARS) was insignificantly higher in diabetic rats. Plasma NO2+NO3 values (p < 0.05) and erythrocyte CuZn superoxide dismutase (CuZn SOD) and glutathione peroxidase (GSH Px) activities were significantly higher (p < 0.01, p < 0.001, respectively) in diabetic rats. L-NAME administration to diabetic rats caused significantly lower CuZn SOD and GSH Px activities (p < 0.01) and NO2+NO3 values (p < 0.001), whereas a significantly higher GSH level (p < 0.01). TBARS/GSH ratio was significantly higher in diabetic rats than controls (p < 0.05) and significantly lower in L-NAME administered diabetic rats than diabetic rats (p < 0.05). This experimental study highlightens the importance of NOS inhibition by L-NAME in the attenuation of oxidative stress in STZ diabetic rats.
authors.affiliation: Department of Biochemistry, Cerrahpaşa Medical Faculty, Istanbul University, Istanbul, Turkey. bbseven@superonline.com
authors.forename: Arzu
authors.initials: A
authors.lastname: Seven
authors.forename: Savas
authors.initials: S
authors.lastname: Güzel
authors.forename: Oktay
authors.initials: O
authors.lastname: Seymen
authors.forename: Sabiha
authors.initials: S
authors.lastname: Civelek
authors.forename: Murat
authors.initials: M
authors.lastname: Bolayirli
authors.forename: Günnur
authors.initials: G
authors.lastname: Yiğit
authors.forename: Gülden
authors.initials: G
authors.lastname: Burçak
mesh_terms: D000818:Animals; D003921:Diabetes Mellitus, Experimental / Q000378:metabolism*; D004912:Erythrocytes / Q000378:metabolism; D005978:Glutathione / Q000097:blood; D005979:Glutathione Peroxidase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology*; D009569:Nitric Oxide / Q000097:blood; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors*; D018384:Oxidative Stress / Q000187:drug effects*; D051381:Rats; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
chemical_list: D017392:Thiobarbituric Acid Reactive Substances; D009569:Nitric Oxide; D005979:Glutathione Peroxidase; D019001:Nitric Oxide Synthase; D013482:Superoxide Dismutase; D005978:Glutathione; D019331:NG-Nitroarginine Methyl Ester