title: Tempol, an intracelullar free radical scavenger, reduces liver injury in hepatic ischemia-reperfusion in the rat.
abstract: Liver ischemia is of clinical interest because of its role in liver failure and also hepatic graft rejection. The generation of reactive oxygen species contributes to the injury that follows ischemia-reperfusion. One therapy utilizes the administration of antioxidants; however, only limited experience suggests a potential benefit of systemic administration of these compounds. To overcome the limitations of these compounds, small molecules with improved cell membrane permeability characteristics and higher potency, such as tempol, are being tested in vivo. Tempol, a membrane-permeable radical scavenger, interferes with the formation or the effects of many radicals, including superoxide anions, hydroxyl radicals, and peroxynitrite. The aim of this study was to investigate the effects of tempol in an in vivo rat model of liver ischemia-reperfusion injury. Male Wistar rats were pretreated with tempol (30 mg/kg, i.v.) 5 minutes prior to liver ischemia (for 30 minutes) and reperfusion (for 2 hours). The liver injury was assessed by measuring serum levels of transaminases, lactate dehydrogenase, and gamma-glutamyl transferase. Tempol significantly mitigated the increase in transaminases, lactate dehydrogenase, and gamma-glutamyl transferase following liver ischemia-reperfusion, suggesting an improvement in liver function and resistance to injury.
authors.affiliation: Pharmacology and Pharmacotoxicology Unit, Pharmacy School, University of Lisbon, Av. Forças Armadas, Lisbon, Portugal.
authors.forename: B
authors.initials: B
authors.lastname: Sepodes
authors.forename: R
authors.initials: R
authors.lastname: Maio
authors.forename: R
authors.initials: R
authors.lastname: Pinto
authors.forename: C
authors.initials: C
authors.lastname: Marques
authors.forename: J
authors.initials: J
authors.lastname: Mendes-do-Vale
authors.forename: M C
authors.initials: MC
authors.lastname: McDonald
authors.forename: C
authors.initials: C
authors.lastname: Thiemermann
authors.forename: H
authors.initials: H
authors.lastname: Mota-Filipe
mesh_terms: D000818:Animals; D003497:Cyclic N-Oxides / Q000494:pharmacology*; D004195:Disease Models, Animal; D016166:Free Radical Scavengers / Q000494:pharmacology; D008099:Liver / Q000098:blood supply* / Q000187:drug effects / Q000473:pathology; D008111:Liver Function Tests; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D017382:Reactive Oxygen Species / Q000378:metabolism; D015427:Reperfusion Injury / Q000517:prevention & control*; D013113:Spin Labels
chemical_list: D003497:Cyclic N-Oxides; D016166:Free Radical Scavengers; D017382:Reactive Oxygen Species; D013113:Spin Labels; C001803:tempol