title: Dopamine autoreceptor reserve in vitro: possible role of dopamine D3 receptors.
abstract: Receptor alkylation in vivo with N-ethoxycarbonyl-2-ethoxy-1, 2-dihydroquinoline (EEDQ) decreased the potency, but not the efficacy, of the dopamine D3 receptor-preferring agonist 7-hydroxy-N, N-di-n-propyl-2-aminotetralin (7-OH-DPAT) at synthesis modulating dopamine autoreceptors in striatal and olfactory tubercle slices stimulated by 30 mM K+. In contrast, 7-OH-DPAT was ineffective in slices exposed to forskolin (10 microM). The results support the presence of autoreceptor reserve in vitro, and the partial involvement of dopamine D3 receptors in the autoregulation of dopamine synthesis.
authors.affiliation: Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, MI 48202, USA.
authors.forename: C W
authors.initials: CW
authors.lastname: Aretha
authors.forename: M P
authors.initials: MP
authors.lastname: Galloway
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism; D000478:Alkylation; D000818:Animals; D005576:Colforsin / Q000494:pharmacology; D003342:Corpus Striatum / Q000378:metabolism / Q000648:ultrastructure; D004295:Dihydroxyphenylalanine / Q000378:metabolism; D004298:Dopamine / Q000096:biosynthesis; D018491:Dopamine Agonists / Q000494:pharmacology; D018492:Dopamine Antagonists / Q000494:pharmacology; D004347:Drug Interactions; D008297:Male; D009833:Olfactory Pathways / Q000378:metabolism / Q000648:ultrastructure; D011188:Potassium / Q000494:pharmacology; D011804:Quinolines / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D017448:Receptors, Dopamine D2 / Q000378:metabolism / Q000502:physiology*; D050637:Receptors, Dopamine D3; D013764:Tetrahydronaphthalenes / Q000494:pharmacology
chemical_list: D018491:Dopamine Agonists; D018492:Dopamine Antagonists; C493595:Drd3 protein, rat; D011804:Quinolines; D017448:Receptors, Dopamine D2; D050637:Receptors, Dopamine D3; D013764:Tetrahydronaphthalenes; D005576:Colforsin; C000470:EEDQ; D004295:Dihydroxyphenylalanine; D000262:Adenylyl Cyclases; C031349:7-hydroxy-2-N,N-dipropylaminotetralin; D011188:Potassium; D004298:Dopamine