title: Inherited, selective hyporesponsiveness to the analgesic action of nicotine in mice.
abstract: The acute dose-dependent analgesic activity of nicotine, as measured by the tail-flick assay, differed significantly between CD-1 and CF-1 outbred strains of mice. Differing responsiveness to the tail-flick stimulus did not explain this pharmacological effect. The inherent analgesic hyporesponsiveness of CF-1 mice was pharmacologically selective. Xilocaine and morphine produced an analgesic response of large magnitude in CF-1 mice. Reduced efficacy of nicotine in the CF-1 analgesia assay was not observed in its action on locomotor activity or in the induction of seizures and lethality. These findings have practical significance in identifying the importance of genotype in choice of strain for preclinical pharmacological studies of nicotine-induced analgesia and indicate that genetic analysis may provide a valuable tool for investigating the mechanism underlying the analgesic action of nicotine.
authors.affiliation: Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City 73190, USA.
authors.forename: T W
authors.initials: TW
authors.lastname: Seale
authors.forename: R
authors.initials: R
authors.lastname: Nael
authors.forename: G
authors.initials: G
authors.lastname: Basmadjian
mesh_terms: D018712:Analgesics, Non-Narcotic / Q000494:pharmacology*; D000701:Analgesics, Opioid / Q000494:pharmacology; D000818:Animals; D005838:Genotype; D006358:Hot Temperature; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009020:Morphine / Q000494:pharmacology; D009043:Motor Activity / Q000187:drug effects; D009538:Nicotine / Q000494:pharmacology*; D010146:Pain / Q000235:genetics* / Q000523:psychology; D010147:Pain Measurement / Q000187:drug effects; D011930:Reaction Time / Q000187:drug effects; D011978:Receptors, Nicotinic / Q000187:drug effects / Q000235:genetics
chemical_list: D018712:Analgesics, Non-Narcotic; D000701:Analgesics, Opioid; D011978:Receptors, Nicotinic; D009538:Nicotine; D009020:Morphine