title: Protection by U-50,488H against beta-chlornaltrexamine antagonism of nitrous oxide antinociception in mice.
abstract: Nitrous oxide antinociception in the abdominal constriction test was significantly reduced in mice pretreated intracerebroventricularly (i.c.v.) with beta-chlornaltrexamine (beta-CNA). However, this antagonism was reversed when the beta-CNA was co-administered i.c.v. with the kappa-opioid ligand U-50,488H but not the mu-opioid ligand CTOP. These findings further demonstrate that nitrous oxide antinociception in the mouse abdominal constriction paradigm is mediated by kappa- but not mu-opioid receptors.
authors.affiliation: Department of Biomedical Sciences, University of Illinois College of Medicine, Rockford 61107-1897.
authors.forename: R M
authors.initials: RM
authors.lastname: Quock
authors.forename: J
authors.initials: J
authors.lastname: Mueller
mesh_terms: D019900:3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer; D000698:Analgesia; D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D005283:Fentanyl / Q000031:analogs & derivatives / Q000494:pharmacology; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D009271:Naltrexone / Q000031:analogs & derivatives* / Q000494:pharmacology; D009292:Narcotic Antagonists / Q000494:pharmacology*; D009609:Nitrous Oxide / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D010146:Pain / Q000503:physiopathology*; D011759:Pyrrolidines / Q000494:pharmacology*; D017409:Sufentanil
chemical_list: D000700:Analgesics; D009292:Narcotic Antagonists; D011759:Pyrrolidines; D009271:Naltrexone; C017120:chlornaltrexamine; D019900:3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer; D017409:Sufentanil; D009609:Nitrous Oxide; D005283:Fentanyl