title: N-methyl-D-aspartic acid-receptor antagonists block morphine-induced conditioned place preference in rats.
abstract: We addressed the question of whether (+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5,10-imine (MK-801) and DL-(E)-2-amino-4-methyl-5-phosphono-3-pentenoic acid (CGP37849), a non-competitive and a competitive N-methyl-D-aspartate (NMDA) receptor antagonist, respectively, are able to block morphine-induced conditioned place preference (CPP). MK-801 alone (0.1 mg/kg) produced neither a place preference nor a place aversion, but was able to completely block morphine-induced CPP. CGP37849 alone (10 mg/kg) produced a small but significant CPP, and was able to significantly attenuate morphine-induced CPP. These results cannot be due to simple additive effects of drug actions, but suggest that NMDA receptors play a complex role in the development of morphine CPP.
authors.affiliation: Department of Neuropharmacology, University of Tübingen, Germany.
authors.forename: T M
authors.initials: TM
authors.lastname: Tzschentke
authors.forename: W J
authors.initials: WJ
authors.lastname: Schmidt
mesh_terms: D015763:2-Amino-5-phosphonovalerate / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D003216:Conditioning, Operant / Q000187:drug effects; D016291:Dizocilpine Maleate / Q000494:pharmacology; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D007274:Injections, Intraperitoneal; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D016194:Receptors, N-Methyl-D-Aspartate / Q000037:antagonists & inhibitors* / Q000187:drug effects; D013997:Time Factors
chemical_list: D018691:Excitatory Amino Acid Antagonists; D016194:Receptors, N-Methyl-D-Aspartate; C064539:2-amino-4-methyl-5-phosphono-3-pentenoic acid; D016291:Dizocilpine Maleate; D015763:2-Amino-5-phosphonovalerate; D009020:Morphine