Rimonabant, a specific antagonist of the cannabinoid CB1-receptor, prevents lipopolysaccharide-induced endotoxemia in awake guinea pigs

DOI 2 Citations 56 References Open Access
  • Inagaki Eiji
    Department of Emergency and Critical Care Medicine, Nippon Medical School
  • Nemoto Kayo
    Department of Emergency and Critical Care Medicine, Nippon Medical School The Graduate University of Japan Traditional Medicine and Science
  • Ninomiya Norifumi
    Department of Emergency and Critical Care Medicine, Nippon Medical School
  • Ishinokami Saori
    Department of Emergency and Critical Care Medicine, Nippon Medical School
  • Yokota Hiroyuki
    Department of Emergency and Critical Care Medicine, Nippon Medical School
  • Kubota Minoru
    Department of Clinical Laboratery, Nippon Medical School

Bibliographic Information

Published
2010
DOI
  • 10.3893/jjaam.21.118
Publisher
Japanese Association for Acute Medicine

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2-arachidonoyl glycerol (2-AG), an endogenous cannabinoid, has been drawing much attention as an early stage mediator at the onset of sepsis. In the present study, we investigated weather rimonabant, one of the CB1 antagonists, alleviated the medical conditions during endotoxemia and measured the level of prostaglandin E metabolite (PGEM). A cylindrical electric transmitter was connected to the transducer via a cable embedded beneath the animal's dorsal skin and sutured in place. Signals from the transmitter were detected by a receiver placed directly beneath the cage via telemetry. We monitored arterial pressure via catheter in the carotid artery and administrated drugs via catheter in jugular vein. We separated animals into three groups. The control group received lipopolysaccharide (LPS, 0.3 mg/kg, i.v.) and vehicle i.v. Experimental animals received LPS and rimonabant (1, 3 mg/kg/h) i.v. Ten minutes after the injection of the vehicle or rimonabant, LPS (0.3 mg/kg, i.v.) was administered. The prostaglandin E metabolites (PGEM) levels were measured by EIASA. In the control group, LPS induced intestinal paralysis and the decline in blood pressure peaked 1-3h after administration of LPS. In rimonabant-treated group, rimonabant inhibited LPS-induced intestinal paralysis and hypotension. Levels of PGEM in guinea pig was increased by LPS-administrate, rimonabant inhibits PGEM increase. The results suggest that rimonabant was effective against LPS-induced endotoxemia in guinea pigs.

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