Suppression of ischemia/reperfusion liver injury by histamine H4 receptor stimulation in rats

Naoto Adachi, Keyue Liu, Atsuko Motoki, Masahiro Nishibori, Tatsuru Arai

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Inflammatory reactions play an important role in ischemia/reperfusion injury in various organs. Since histamine is closely related to inflammatory reactions and immune responses, effects of postischemic administration of histaminergic ligands on ischemia-induced liver injury were examined in rats. Animals were subjected to warm ischemia for 30 min by occlusion of the left portal vein and hepatic artery under halothane anesthesia, and liver damage was evaluated by assessing plasma concentrations of transaminases after 24 h. Warm ischemia for 30 min provoked severe liver damage after 24 h, and the plasma concentrations of alanine transaminase (ALT) and aspartate transaminase (AST) were 8600 I.U./l and 13100 I.U./l, respectively. Subcutaneous injections of histamine twice, immediately and 6 h after reperfusion (20 mg/kg, each), alleviated liver damage. The plasma concentrations of ALT and AST in the histamine group were 35% and 24% of those in the control group, respectively. Neither mepyramine (3 mg/kg × 2), an H1 antagonist, nor cimetidine (15 mg/kg × 2), an H2 antagonist, affected the outcome in histamine-treated rats. However, thioperamide (5 mg/kg × 2), an H3/H4 antagonist, completely abolished the alleviation caused by histamine. Administration of dimaprit (1-10 mg/kg × 2), an H2/H4 agonist, mimicked the protective effect of histamine, and the effect of dimaprit is reversed by thioperamide, whereas neither H1 nor H2 antagonists altered the outcome caused by dimaprit. Clozapine (15 mg/kg × 2), an H4 agonist, also mimicked the protective effect of histamine. These findings indicate that stimulation of histamine H4 receptors after ischemic events prevents development of reperfusion injury in the liver.

Original languageEnglish
Pages (from-to)181-187
Number of pages7
JournalEuropean Journal of Pharmacology
Volume544
Issue number1-3
DOIs
Publication statusPublished - Aug 21 2006

Keywords

  • (Rat)
  • Histamine
  • Histamine H receptor
  • Liver ischemia
  • Portal vein

ASJC Scopus subject areas

  • Pharmacology

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