title: The leukotriene B4 receptor antagonist ONO-4057 inhibits mesangioproliferative changes in anti-Thy-1 nephritis.
abstract: OBJECTIVE
  ONO-4057 is a specific leukotriene B4 (LTB4) receptor antagonist which inhibits human neutrophil aggregation, chemotaxis and degranulation induced by LTB4. This study was conducted to evaluate the role of LTB4 in glomerulonephritis, and to examine whether ONO-4057 moderated anti-Thy-1 nephritis.
  
  
  METHODS
  Experiment 1: Sixty Wistar rats were divided into three groups. Rats of Group A (n = 20) underwent intraperitoneal administration of placebo as a control group, rats of Group B (n = 20) first underwent intraperitoneal administration of 100 mg/kg ONO-4057 and rats of Group C (n = 20) first underwent intraperitoneal administration of 300 mg/kg ONO-4057 daily from day 3 before anti-Thy-1 antibody (OX7) injection to day 14 after OX7 injection, respectively. Experiment 2: Forty rats were divided into two groups. ONO-group (n = 20) was treated with 300 mg/kg BW of ONO-4057 and placebo-group (n = 20) with placebo daily from days 1 to 13 after OX7 injection. Urine and blood samples were collected and the kidneys were extirpated from five rats of each group sacrificed at 3 h, 24 h, day 7 or day 14 after the injection of OX7 in both experiments. Urinary protein excretion, renal function and pathological findings were analysed in each group of both experiments.
  
  
  RESULTS
  (1) Glomerular infiltration by polymorphonuclear leucocytes (PMNs) and macrophages at 3 h was less in Groups B and C than in Group A, and matrix scores at day 7 were lower in Groups B and C than in Group A. Injury scores did not differ among the groups. (2) Urinary protein excretion at day 7 was less in Group C than in Group A. (3) Neither pathological findings nor urinary protein excretion differed between ONO-group and placebo-group.
  
  
  CONCLUSIONS
  These results suggest that LTB4 is associated not with the pathogenesis of complement-dependent mesangial cell lysis but with that of mesangial proliferative change in anti-Thy-1 nephritis.
authors.affiliation: Department of Pediatrics, Fukushima Medical University School of Medicine, 1 Hikariga-oka, Fukushima City, Fukushima 960-1295, Japan. tomo@fmu.ac.jp
authors.forename: Yukihiko
authors.initials: Y
authors.lastname: Kawasaki
authors.forename: Mieko
authors.initials: M
authors.lastname: Tanji
authors.forename: Kei
authors.initials: K
authors.lastname: Takano
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Fukuda
authors.forename: Masato
authors.initials: M
authors.lastname: Isome
authors.forename: Ruriko
authors.initials: R
authors.lastname: Nozawa
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Suzuki
authors.forename: Mitsuaki
authors.initials: M
authors.lastname: Hosoya
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000633:toxicity; D004195:Disease Models, Animal; D005260:Female; D015432:Glomerulonephritis, Membranoproliferative / Q000139:chemically induced / Q000188:drug therapy* / Q000378:metabolism; D007150:Immunohistochemistry; D007166:Immunosuppressive Agents / Q000494:pharmacology*; D007518:Isoantibodies / Q000633:toxicity; D007678:Kidney Glomerulus / Q000187:drug effects / Q000276:immunology / Q000473:pathology; D010666:Phenylpropionates / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D018102:Receptors, Leukotriene B4 / Q000037:antagonists & inhibitors*
chemical_list: D000911:Antibodies, Monoclonal; D007166:Immunosuppressive Agents; D007518:Isoantibodies; D010666:Phenylpropionates; D018102:Receptors, Leukotriene B4; C035678:anti-Thy antibody; C067523:ONO-LB 457