title: [P-8502--a new mu selective opioid receptor ligand].
abstract: The analgesic potencies of 3-[beta-(p-amino)-phenethyl)-9 beta-methoxy-9 alpha-(m-methoxyphenyl)-3- azabicyclo [3,3,1] nonane (P-8502) and 3-[beta-(p-monoester fumarylamido)-phenethyl]-9 beta-methoxy-9 alpha-(m-methoxyphenyl)-3-azabicyclo [3,3,1] nonane (P-8511) were examined. The analgesic ED50 of P-8502 and P-8511 were 55 and 200 micrograms/kg (mice, ip, hot plate), and 30 and 95 micrograms/kg (rat, sc, tail flick), respectively. The duration of the analgesic action of P-8511 (about 4 h) was longer than that of P-8502 (about 1.5 h, rat, sc, tail flick). Binding assay showed that P-8502 had a high ratio of delta/mu, kappa/mu: IC50 (DPDPE)/IC50 (DAGO) = 399; IC50(DAD-LE)/IC50 (DAGO) = 1498; IC50 (kappa)/IC50 (DAGO) = 159. In conclusion, P-8502 appears to be a new mu selective opioid receptor ligand, whereas P-8511 has no such selectivity.
authors.forename: B L
authors.initials: BL
authors.lastname: Ge
authors.forename: H P
authors.initials: HP
authors.lastname: Zhang
authors.forename: Y P
authors.initials: YP
authors.lastname: Xu
authors.forename: W J
authors.initials: WJ
authors.lastname: Zheng
mesh_terms: D000700:Analgesics; D000818:Animals; D001667:Binding, Competitive; D001643:Bridged Bicyclo Compounds / Q000494:pharmacology*; D019086:Bridged Bicyclo Compounds, Heterocyclic; D001952:Bridged-Ring Compounds / Q000494:pharmacology*; D005260:Female; D008024:Ligands; D008297:Male; D051379:Mice; D010146:Pain / Q000503:physiopathology*; D051381:Rats; D011957:Receptors, Opioid / Q000145:classification; D017450:Receptors, Opioid, mu; D012684:Sensory Thresholds / Q000187:drug effects
chemical_list: D000700:Analgesics; D001643:Bridged Bicyclo Compounds; D019086:Bridged Bicyclo Compounds, Heterocyclic; D001952:Bridged-Ring Compounds; D008024:Ligands; D011957:Receptors, Opioid; D017450:Receptors, Opioid, mu; C061489:P 8502; C061490:P 8511