title: The protection by heme oxygenase-1 induction against thioacetamide-induced liver toxicity is associated with changes in arginine and asymmetric dimethylarginine.
abstract: This study was designed to investigate the role of HO-1 induction in prevention of thioacetamide (TAA)-induced oxidative stress, inflammation and liver damage. The changes in hepatic dimethylarginine dimethylaminohydrolase (DDAH) activity as well as plasma arginine and asymmetric dimethylarginine (ADMA) levels were also measured to evaluate nitric oxide (NO) bioavailability. Rats were divided into four groups as control, hemin, TAA and hemin + TAA groups. Hemin (50 mg kg(-1) , i.p.) was injected to rats 18 h before TAA treatment to induce HO-1 enzyme expression. Rats were given TAA (300 mg kg(-1) , i.p.) and killed 24 h after treatment. Although TAA treatment produced severe hepatic injury, upregulation of HO-1 ameliorated TAA-induced liver damage up to some extent as evidence by decreased serum alanine transaminase, aspartate transaminase and arginase activities and histopathological findings. Induction of HO-1 stimulated antioxidant system and decreased lipid peroxidation in TAA-treated rats. Myeloperoxidase activity and inducible NO synthase protein expression were decreased, whereas DDAH activity was increased by hemin injection in TAA-treated rats. Induction of HO-1 was associated with increased arginine levels and decreased ADMA levels, being the main determinants of NO production, in plasma of TAA-treated rats. In conclusion, our results indicate that HO-1 induction alleviated increased oxidative stress and inflammatory reactions together with deterioration in NO production in TAA-induced liver damage in rats.
authors.affiliation: Department of Biochemistry, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey.
authors.forename: Seval
authors.initials: S
authors.lastname: Develi-Is
authors.forename: Seldag
authors.initials: S
authors.lastname: Bekpinar
authors.forename: Esra Betul
authors.initials: EB
authors.lastname: Kalaz
authors.forename: Betul
authors.initials: B
authors.lastname: Evran
authors.forename: Yesim
authors.initials: Y
authors.lastname: Unlucerci
authors.forename: Mine
authors.initials: M
authors.lastname: Gulluoglu
authors.forename: Mujdat
authors.initials: M
authors.lastname: Uysal
mesh_terms: D000410:Alanine Transaminase / Q000378:metabolism; D000818:Animals; D001119:Arginase / Q000378:metabolism; D001120:Arginine / Q000031:analogs & derivatives* / Q000097:blood; D001219:Aspartate Aminotransferases / Q000378:metabolism; D015153:Blotting, Western; D004790:Enzyme Induction / Q000187:drug effects; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D051547:Heme Oxygenase-1 / Q000096:biosynthesis*; D008099:Liver / Q000187:drug effects / Q000201:enzymology / Q000473:pathology*; D008107:Liver Diseases / Q000097:blood / Q000188:drug therapy* / Q000201:enzymology / Q000473:pathology*; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism; D020011:Protective Agents / Q000494:pharmacology / Q000627:therapeutic use*; D051381:Rats; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000378:metabolism; D013853:Thioacetamide
chemical_list: D020011:Protective Agents; D013853:Thioacetamide; D008315:Malondialdehyde; C018524:N,N-dimethylarginine; D001120:Arginine; D005979:Glutathione Peroxidase; D052247:Nitric Oxide Synthase Type II; D051547:Heme Oxygenase-1; D013482:Superoxide Dismutase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; D001119:Arginase; D005978:Glutathione