title: Dopamine D1 receptor agonist-induced grooming is blocked by the opioid receptor antagonist naloxone.
abstract: The effects of the opioid receptor antagonist naloxone on behavioural responses to the dopamine D1 receptor agonist SKF 38393 ((+/-)-1-phenyl-2,3,4,5-tetrahydro-(1H)-3-benzazepine-7,8-diol hydrochloride) were assessed in the rat. SKF 38393 (5 mg/kg s.c.) induced grooming and vacuous chewing mouth movements. SKF 38393-induced grooming was dose-dependently attenuated by naloxone (0.375-1.5 mg/kg s.c), while vacuous chewing movements were unaffected. These findings suggest that dopamine D1 receptor agonist-induced grooming is dependent upon opioid systems, while vacuous chewing movements are likely to be mediated via different pathways.
authors.affiliation: Department of Clinical Neurological Sciences, University of Western Ontario, London, Canada.
authors.forename: A J
authors.initials: AJ
authors.lastname: Stoessl
mesh_terms: D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D000818:Animals; D004305:Dose-Response Relationship, Drug; D006120:Grooming / Q000187:drug effects*; D008297:Male; D009068:Movement / Q000187:drug effects; D009270:Naloxone / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017447:Receptors, Dopamine D1 / Q000819:agonists*
chemical_list: D017447:Receptors, Dopamine D1; D009270:Naloxone; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine