title: Pharmacological properties of SM-3997: a new anxioselective anxiolytic candidate.
abstract: Pharmacological properties of SM-3997 (3a alpha,4 beta,7 beta,7a alpha-hexahydro-2-(4-(4-(2-pyrimidinyl)-1- piperazinyl)-butyl)-4,7-methano-1H-isoindole-1,3(2H)-dione dihydrogen citrate) have been examined in rats and mice. SM-3997 showed a dose-related anticonflict activity in rats in a water lick conflict paradigm, and it had no effect on water consumption in a spontaneous water drinking test. The potency of SM-3997 appeared to be equal to that of buspirone and about one-half that of diazepam. No tolerance to the anticonflict activity of SM-3997 was observed following 5 and 10 consecutive days of treatment. Unlike diazepam, SM-3997 had no anticonvulsant effect and had very weak muscle relaxant and hypnotic effects. On the other hand, SM-3997 and buspirone exhibited dopamine antagonistic action, although the potency of SM-3997 was less than one fourth that of buspirone. These results show that SM-3997 is a new anxioselective anxiolytic agent which is weaker than buspirone in the dopaminergic neuron system.
mesh_terms: D000758:Anesthesia; D000818:Animals; D014151:Anti-Anxiety Agents / Q000494:pharmacology*; D000927:Anticonvulsants; D003220:Conflict, Psychological; D004357:Drug Synergism; D054833:Isoindoles; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009043:Motor Activity / Q000187:drug effects; D009125:Muscle Relaxants, Central; D010879:Piperazines / Q000494:pharmacology*; D004856:Postural Balance / Q000187:drug effects; D011743:Pyrimidines / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D011954:Receptors, Dopamine / Q000187:drug effects
chemical_list: D014151:Anti-Anxiety Agents; D000927:Anticonvulsants; D054833:Isoindoles; D009125:Muscle Relaxants, Central; D010879:Piperazines; D011743:Pyrimidines; D011954:Receptors, Dopamine; C055267:tandospirone