title: Locomotor behaviors in response to new selective D-1 and D-2 dopamine receptor agonists, and the influence of selective antagonists.
abstract: With the introduction of the selective D-1 dopamine receptor agonist and antagonist benzazepines, especially as enantiomeric pairs, there is now a range of D-1 compounds to complement the previously available selective D-2 agents. These have been used to investigate whether sub-types of dopamine receptors might be differentially involved in locomotor behavior. Stereotyped locomotion induced by the non-selective D-2 agonist apomorphine and by the selective D-2 agonist RU 24213 were blocked by the selective D-2 antagonists metoclopramide and Ro 22-2586 [-)-piquindone). Responses to either D-2 agonist were also blocked by the selective D-1 antagonists SCH 23390 and R-(but not S-) SK&F 83566. Non-stereotyped locomotion was induced by R- but not S-SK&F 38393, a stereoselective D-1 agonist, and was blocked by SCH 23390. Responses to the D-1 agonist were also antagonised by metoclopramide. Such results suggest concerted D-1:D-2 interplay in the regulation of at least some dopaminergic behaviors, such as locomotion.
mesh_terms: D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / Q000031:analogs & derivatives; D000818:Animals; D001552:Benzazepines / Q000494:pharmacology; D005475:Flupenthixol / Q000494:pharmacology; D007546:Isoquinolines / Q000494:pharmacology; D008297:Male; D008787:Metoclopramide / Q000494:pharmacology; D009043:Motor Activity / Q000187:drug effects*; D010627:Phenethylamines / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D011954:Receptors, Dopamine / Q000187:drug effects*; D013268:Stimulation, Chemical
chemical_list: D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; D001552:Benzazepines; D005475:Flupenthixol; D007546:Isoquinolines; D008787:Metoclopramide; D010627:Phenethylamines; D011954:Receptors, Dopamine; C016868:N-n-propyl-N-phenylethyl-4(3-hydroxyphenyl)ethylamine hydrochloride; C044846:SKF83566; C032412:Ro 22-1319