Grechko OY, Litvinov RA, Spasov AA, Rashchenko AI, Shtareva DM, Anisimova VA, Minkin VI. Study of μ- and δ-Opioid Activities in Agents with Various κ-Receptor Selectivity.
Bull Exp Biol Med 2017;
162:632-635. [PMID:
28361412 DOI:
10.1007/s10517-017-3674-5]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Indexed: 12/18/2022]
Abstract
A putative opioid agonist RU-1205 was ineffective within in vitro model of electrically induced contractions of rat ileum assessing the μ- and δ-opioid receptor pathways, while morphine inhibited these contractions in a dose-dependent and naloxone-reversible manners with EC50=2.6×10-7 M. In vivo experiments revealed no significant effects of RU-1205 on respiration and gastrointestinal tract contractile activity. In contrast, butorphanol decreased respiration rate by 25% (25-100 mg/kg) and slowed down the transit of labeled particles along the small intestine by 77.1% (1 mg/kg) and by 45.5% (10 mg/kg). Morphine-induced inhibition of peristalsis was dose-dependent with maximum effect (by 68.6%) observed in the dose of 10 mg/kg. It was concluded that the effects of RU-1205 are not related to activation μ- and δ-opioid receptors known to mediate the effects of non-selective opioid agonist morphine and agonist-antagonist butorphanol.
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