title: Identification of D1-dopamine receptor in chicken embryo retina with [125I]SCH 23982.
abstract: The D1-dopamine receptor in chicken embryo retina was identified with the D1-dopamine receptor specific ligand, [125I]SCH 23982. Binding of [125I]SCH 23982 to both pre-hatched and post-hatched chicken retina was rapid, saturable and of high affinity. The dissociation constant and maximal binding capacity were 795 +/- 25 pM (mean +/- S.E.M., n = 3) and 32.2 +/- 3.8 fmol/mg protein (mean +/- S.E.M., n = 3), respectively for 13-day-old chicken embryo retina, and 785 +/- 58 pM (mean +/- S.E.M., n = 3) and 96.9 +/- 4.1 fmol/mg protein (mean +/- S.E.M., n = 3), respectively for 1-day-old post-hatched chicken retina. The binding properties of the D1-dopamine receptor in chicken retina were similar to those in rat striatum. The maximal binding capacity of the D1-dopamine receptor for [125I]SCH 23982 was increased concomitant with embryonic development, but without any changes in either affinity or pharmacological properties. Dopamine-stimulated adenylate cyclase activity in the retinal homogenates increased concomitant with embryonic development, diminished in the presence of 1 microM SCH 23390 (a D1-dopaminergic antagonist) but remained unaffected by 1 microM YM-09151-2 (a D2-dopaminergic antagonist).
authors.affiliation: Experimental Therapeutics Branch, National Institute of Neurological and Communicative Disorders and Stroke, Bethesda, MD 20892.
authors.forename: T
authors.initials: T
authors.lastname: Agui
authors.forename: T N
authors.initials: TN
authors.lastname: Chase
authors.forename: J W
authors.initials: JW
authors.lastname: Kebabian
mesh_terms: D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; D000262:Adenylyl Cyclases / Q000378:metabolism; D000818:Animals; D001549:Benzamides / Q000378:metabolism; D001552:Benzazepines / Q000378:metabolism* / Q000494:pharmacology; D002642:Chick Embryo; D003342:Corpus Striatum / Q000378:metabolism; D051381:Rats; D011954:Receptors, Dopamine / Q000378:metabolism*; D017447:Receptors, Dopamine D1; D012160:Retina / Q000196:embryology* / Q000378:metabolism
chemical_list: C049558:8-iodo-2,3,4,5-tetrahydro-3-methyl-5-phenyl-1H-3-benzazepine-7-ol; D001549:Benzamides; D001552:Benzazepines; D011954:Receptors, Dopamine; D017447:Receptors, Dopamine D1; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; D000262:Adenylyl Cyclases; C030265:nemonapride