title: B-HT 920 is a full agonist at both pre- and postsynaptic D-2 dopamine receptors.
abstract: Stimulation of presynaptic D-2 dopamine receptors by B-HT 920 or by apomorphine inhibited the synthesis of dopamine in the corpus striatum of gammabutyrolactone-treated mice to about the same extent. Stimulation of postsynaptic D-2 dopamine receptors by B-HT 920 given in combination with the D-1 receptor agonist SKF38393 enhanced the motor activity of reserpine-treated mice at least as much as observed following the combined D-1/D-2 receptor agonist apomorphine. Since B-HT 920 is as effective as apomorphine in these models, B-HT 920 appears to be a full agonist at both pre- and post-synaptic D-2 dopamine receptors.
authors: Department of Pharmacology, Karolinska Institutet, Stockholm, Sweden.
authors: N E
authors: NE
authors: Andén
authors: M
authors: M
authors: Grabowska-Andén
mesh_terms: D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / Q000494:pharmacology; D000818:Animals; D001058:Apomorphine / Q000494:pharmacology; D001381:Azepines / Q000494:pharmacology*; D003342:Corpus Striatum / Q000187:drug effects / Q000378:metabolism*; D004298:Dopamine / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D008297:Male; D051379:Mice; D009043:Motor Activity / Q000187:drug effects*; D011954:Receptors, Dopamine / Q000187:drug effects*; D017448:Receptors, Dopamine D2
chemical_list: D001381:Azepines; D011954:Receptors, Dopamine; D017448:Receptors, Dopamine D2; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; C024763:talipexole; D001058:Apomorphine; D004298:Dopamine