title: Dihydrexidine, a full D1 dopamine receptor agonist, induces rotational asymmetry in hemiparkinsonian monkeys.
abstract: Dihydrexidine (trans-10,11-dihydroxy5,6,6a,7,8,12b hexanhyydrobenso- [alpha]phenanthridine) is a full dopamine D1 agonist. In rhesus macaque monkeys rendered hemiparkinsonian by unilateral intracarotid infusions of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), dihydrexidine (0.15-0.9 mg/kg) elicited dose-dependent contralateral rotation. The effects of dihydrexidine were blocked by pretreatment with the D1 antagonist SCH 23390 (0.03 mg/kg), but not by the D2 antagonist raclopride (0.025 mg/kg). These results suggest a functional role for D1 receptors in stimulating motor behavior in a primate model of Parkinson's disease.
authors.affiliation: Department of Neurology, Hahnemann University, Philadelphia, PA 19102, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: Johnson
authors.forename: V
authors.initials: V
authors.lastname: Peacock
authors.forename: J S
authors.initials: JS
authors.lastname: Schneider
mesh_terms: D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D001552:Benzazepines / Q000494:pharmacology; D065127:Dopamine D2 Receptor Antagonists; D004305:Dose-Response Relationship, Drug; D004873:Ergolines / Q000494:pharmacology; D007839:Functional Laterality / Q000187:drug effects*; D008253:Macaca mulatta; D008297:Male; D010302:Parkinson Disease, Secondary / Q000139:chemically induced / Q000523:psychology*; D010617:Phenanthridines / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D019257:Quinpirole; D020891:Raclopride; D017447:Receptors, Dopamine D1 / Q000819:agonists* / Q000037:antagonists & inhibitors; D012399:Rotation; D012457:Salicylamides / Q000494:pharmacology
chemical_list: D001552:Benzazepines; D065127:Dopamine D2 Receptor Antagonists; D004873:Ergolines; D010617:Phenanthridines; D017447:Receptors, Dopamine D1; D012457:Salicylamides; D019257:Quinpirole; C061532:dihydrexidine; D020891:Raclopride; D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine