title: Effects of the non-competitive NMDA receptor antagonist ketamine on morphine-induced place preference in mice.
abstract: The effects of ketamine, a noncompetitive N-methyl-D-aspartate (NMDA) receptor antagonist, on morphine-induced place preference were examined in mice. Morphine (1-5 mg/kg, s.c.) produced a dose-related place preference in mice. Ketamine alone (3, 10 mg/kg, i.p.), like dizocilpine alone (0.2 mg/ kg, i.p.), also produced a preference for the drug-associated place. Pretreatment with ketamine (10 mg/ kg, i.p.) or dizocilpine (0.1 and 0.2 mg/kg, i.p) suppressed the place preference produced by morphine in a dose-dependent manner. These findings provide the first demonstration that ketamine alone produces a place preference using the conditioned place preference (CPP) paradigm, but that mice treated with ketamine combined with morphine show neither a morphine- nor a ketamine-induced place preference.
authors.affiliation: Department of Toxicology, School of Pharmacy, Hoshi University, Tokyo, Japan. suzuki@hoshi.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.forename: H
authors.initials: H
authors.lastname: Kato
authors.forename: T
authors.initials: T
authors.lastname: Aoki
authors.forename: M
authors.initials: M
authors.lastname: Tsuda
authors.forename: M
authors.initials: M
authors.lastname: Narita
authors.forename: M
authors.initials: M
authors.lastname: Misawa
mesh_terms: D000701:Analgesics, Opioid / Q000494:pharmacology*; D000818:Animals; D001522:Behavior, Animal; D003216:Conditioning, Operant / Q000187:drug effects*; D016291:Dizocilpine Maleate / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D007649:Ketamine / Q000494:pharmacology*; D008297:Male; D051379:Mice; D009020:Morphine / Q000494:pharmacology*; D016194:Receptors, N-Methyl-D-Aspartate / Q000037:antagonists & inhibitors*
chemical_list: D000701:Analgesics, Opioid; D016194:Receptors, N-Methyl-D-Aspartate; D007649:Ketamine; D016291:Dizocilpine Maleate; D009020:Morphine