title: Electron spin resonance and spin trapping technique provide direct evidence that edaravone prevents acute ischemia-reperfusion injury of the liver by limiting free radical-mediated tissue damage.
abstract: A novel free radical scavenger, 3-methyl-1-phenyl-2-pyrazolin-5-one (edaravone), is used for the treatment of acute ischemic stroke and is protective in several animal models of organ injury. We tested whether edaravone is protective against acute liver warm ischemia/reperfusion injury in the rat by acting as a radical scavenger. When edaravone was administered prior to ischemia and at the time of initiation of the reperfusion, liver injury was markedly reduced. Production of oxidants in the liver in this model was assessed in vivo by spin-trapping/electron spin resonance (ESR) spectroscopy. Ischemia/reperfusion caused an increase in free radical adducts rapidly, an effect markedly blocked by edaravone. Furthermore, edaravone treatment blunted ischemia/reperfusion-induced elevation in pro-inflammatory cytokines, infiltration of leukocytes and lipid peroxidation in the liver. These results demonstrate that edaravone is an effective blocker of free radicals in vivo in the liver after ischemia/reperfusion, leading to prevention of organ injury by limiting the deleterious effects of free radicals.
authors.affiliation: First Department of Surgery, University of Yamanashi, Yamanashi, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kono
authors.forename: Courtney G
authors.initials: CG
authors.lastname: Woods
authors.forename: Akira
authors.initials: A
authors.lastname: Maki
authors.forename: Henry D
authors.initials: HD
authors.lastname: Connor
authors.forename: Ronald P
authors.initials: RP
authors.lastname: Mason
authors.forename: Ivan
authors.initials: I
authors.lastname: Rusyn
authors.forename: Hideki
authors.initials: H
authors.lastname: Fujii
mesh_terms: D000208:Acute Disease; D000818:Animals; D000983:Antipyrine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000077553:Edaravone; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000737:chemistry / Q000378:metabolism*; D007249:Inflammation / Q000378:metabolism / Q000473:pathology; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D008099:Liver / Q000737:chemistry / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000235:genetics / Q000378:metabolism* / Q000473:pathology / Q000517:prevention & control*; D019097:Spin Trapping; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics / Q000378:metabolism
chemical_list: D005609:Free Radicals; D014409:Tumor Necrosis Factor-alpha; D018799:Intercellular Adhesion Molecule-1; D000077553:Edaravone; D000983:Antipyrine