title: Neutrophil elastase inhibitor (ONO-5046) attenuates reperfusion-induced hepatic microcirculatory derangement, energy depletion and lipid peroxidation in rats.
abstract: Microcirculatory derangement, energy depletion, and lipid peroxidation are associated with the development of ischemia-reperfusion injury in the liver. This study investigated the effects of a neutrophil elastase inhibitor (ONO-5046) on hepatic ischemia-reperfusion injury. Adult, male Sprague-Dawley rats were divided into four treatment groups: 1) sham-operated control (laparotomy only, no ischemia) and saline injection (1 mL/kg), n = 6; 2) ischemia control (1-h ischemia, 2-h reperfusion) and saline injection (1 mL/kg), n = 6; 3) intravenous injection with ONO-5046 at a dose of 1 mg/kg 5 min before ischemia and immediately after reperfusion plus 1-h ischemia and 2-h reperfusion, n = 6; and 4) intravenous injection with ONO-5046 at a dose of 10 mg/kg 5 min before ischemia and immediately after reperfusion plus 1-h ischemia and 2-h reperfusion, n = 6. A laser-Doppler flowmeter and in vivo microscopy were used to investigate hepatic microcirculation. Tissue malondialdehyde (MDA) and adenosine triphosphate (ATP) levels were determined at the end of the experiment.
  
  
  RESULTS
  Compared with ischemia alone, ONO-5046 significantly reduced the extent of microcirculatory and hemodynamic derangement after ischemia-reperfusion. ONO-5046 at both doses significantly attenuated decreases in mean arterial pressure. ONO-5046 lessened adherent leukocyte count and improved flow velocity in the sinusoids and postsinusoidal venules. ONO-5046 at the dose of 10m/kg reduced MDA (1.97 +/- 0.54 micromol/g protein vs. 3.58 +/- 1.21 micromol/g protein in the ischemia and reperfusion group) and increased ATP levels (2.62 +/- 0.19 micromol/g wet wt vs. 0.57 +/- 0.37 pmol/g wet wt in the ischemia and reperfusion group), whereas ONO-5046 at a smaller dose (1 mg/kg) had lesser but significant effects on MDA and ATP alterations. This study demonstrates that treatment with ONO-5046, a neutrophil elastase inhibitor, can ameliorate ischemia-reperfusion injury of the rat liver.
authors.affiliation: Department of Surgery, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taipei, Taiwan.
authors.forename: H M
authors.initials: HM
authors.lastname: Chen
authors.forename: J C
authors.initials: JC
authors.lastname: Chen
authors.forename: M H
authors.initials: MH
authors.lastname: Shyr
authors.forename: M F
authors.initials: MF
authors.lastname: Chen
authors.forename: T L
authors.initials: TL
authors.lastname: Hwang
authors.forename: L L
authors.initials: LL
authors.lastname: Fan
authors.forename: T Y
authors.initials: TY
authors.lastname: Chi
authors.forename: C P
authors.initials: CP
authors.lastname: Chi
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D004734:Energy Metabolism / Q000187:drug effects*; D005998:Glycine / Q000031:analogs & derivatives* / Q000494:pharmacology; D006439:Hemodynamics / Q000187:drug effects*; D007511:Ischemia / Q000188:drug therapy* / Q000378:metabolism; D017078:Laser-Doppler Flowmetry; D019272:Leukocyte Elastase / Q000037:antagonists & inhibitors*; D015227:Lipid Peroxidation / Q000187:drug effects*; D008099:Liver / Q000098:blood supply* / Q000000981:diagnostic imaging / Q000187:drug effects; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D008833:Microcirculation / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000378:metabolism / Q000628:therapy*; D015842:Serine Proteinase Inhibitors / Q000494:pharmacology*; D013449:Sulfonamides / Q000494:pharmacology*; D014463:Ultrasonography
chemical_list: D015842:Serine Proteinase Inhibitors; D013449:Sulfonamides; D008315:Malondialdehyde; D000255:Adenosine Triphosphate; C069195:sivelestat; D019272:Leukocyte Elastase; D005998:Glycine