title: Amelioration of hepatic ischemia/reperfusion injury in the remnant liver after partial hepatectomy in rats.
abstract: OBJECTIVE
  Reactive oxygen species have been implicated in the development of hepatic ischemia/reperfusion (I/R) injury. I/R injury remains an important problem in massive hepatectomy and organ transplantation. The aim of this study was to examine the effect of edaravone, a newly synthesized free radical scavenger, on I/R injury in the remnant liver after partial hepatectomy in rats.
  
  
  METHODS
  Partial (70%) hepatic ischemia was induced in rats by occluding the hepatic artery, portal vein, and bile duct to left and median lobes of liver. Total hepatic ischemia (Pringle maneuver) was induced by occluding the hepatoduodenal ligament. Edaravone was intravenously administered to rats just before reperfusion and partial (70%) hepatectomy was performed just after reperfusion.
  
  
  RESULTS
  Edaravone significantly reduced the increases in the levels of serum alanine aminotransferase and aspartate aminotransferase in rats with liver injury induced by 90-min of partial ischemia followed by 120-min of reperfusion. Histopathological analysis showed that edaravone prevented inflammatory changes in the livers with I/R injury. Edaravone also decreased the levels of myeloperoxidase activity, which is an index of neutrophil infiltration, and interleukin-6 mRNA, which is a proinflammatory cytokine. Additionally, edaravone improved the survival rate in partial hepatectomy rats with I/R injury induced by the Pringle maneuver.
  
  
  CONCLUSIONS
  Edaravone administration prior to reperfusion protected the liver against I/R injury. Edaravone also improved the function of the remnant liver with I/R injury after partial hepatectomy. Therefore, edaravone may have applicability for major hepatectomy and liver transplantation in the clinical setting.
authors.affiliation: Department of Surgery, Tsuchiura Kyodo General Hospital, Ibaraki, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Hiranuma
authors.forename: Koji
authors.initials: K
authors.lastname: Ito
authors.forename: Yumi
authors.initials: Y
authors.lastname: Noda
authors.forename: Hisashi
authors.initials: H
authors.lastname: Ozasa
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Koike
authors.forename: Saburo
authors.initials: S
authors.lastname: Horikawa
mesh_terms: D000818:Animals; D000983:Antipyrine / Q000031:analogs & derivatives / Q000494:pharmacology; D000077553:Edaravone; D016166:Free Radical Scavengers / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects; D006498:Hepatectomy / Q000379:methods*; D015850:Interleukin-6 / Q000235:genetics / Q000378:metabolism; D008099:Liver / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism / Q000473:pathology*; D008107:Liver Diseases / Q000201:enzymology / Q000401:mortality / Q000473:pathology; D008297:Male; D009195:Peroxidase / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D015427:Reperfusion Injury / Q000517:prevention & control*; D015996:Survival Rate
chemical_list: D016166:Free Radical Scavengers; D015850:Interleukin-6; D012333:RNA, Messenger; D009195:Peroxidase; D000077553:Edaravone; D000983:Antipyrine