Inhibition of experimental visceral pain in rodents by cebranopadol

Behavioural Pharmacology
Klaus SchieneFrank Porreca

Abstract

The aim of this study was to investigate the efficacy of cebranopadol in two rodent models of visceral pain. Cebranopadol is a first-in-class analgesic with agonist activity at the nociceptin/orphanin FQ opioid peptide receptor and classical µ-, δ- and κ-opioid peptide receptors. Colitis was induced in Naval Medical Research Institute mice by intra-rectal infusion of mustard oil. The effects of intravenous cebranopadol pretreatment on spontaneous pain behaviours and referred allodynia and hyperalgesia were assessed. Pancreatitis was induced in Sprague-Dawley rats by intravenous administration of dibutyltin dichloride. After 6 days, the effects of intravenous cebranopadol on withdrawal reactions to mechanical abdominal stimulation with von Frey filaments were assessed. In mice with experimental colitis, cebranopadol dose-dependently inhibited spontaneous pain behaviours and allodynic and hyperalgesic withdrawal reactions, with half-maximal effective dose values of 4.6 µg/kg [95% confidence interval (CI): 2.9-7.9] for inhibition of spontaneous pain behaviours, 2.2 µg/kg (95% CI: 1.3-3.4) for inhibition of referred allodynia and 2.4 µg/kg (95% CI: 1.4-3.6) for inhibition of referred hyperalgesia in mice with colitis. In rats with ...Continue Reading

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