Piercey MF, Moon MW, Sethy VH, Schreur PJ, Smith MW, Tang AH, Von Voigtlander PF. Pharmacology of U-91356A, an agonist for the dopamine D2 receptor subtype.
Eur J Pharmacol 1996;
317:29-38. [PMID:
8982716 DOI:
10.1016/s0014-2999(96)00695-4]
[Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
U-91356A [(R)-5,6-dihydro-5-(propylamino)4H-imidazo[4,5,1-ij]quinolin -2-(1H)-one, monohydrochloride], bound with highest affinity to the dopamine D2 receptor subtype, although it also bound with somewhat lower affinities to the dopamine D3 and D4, as well as the 5-HT1A receptor subtypes. In addition to depressing dopamine synthesis and turnover, injection of U-91356A increased striatal acetylcholine concentrations. U-91356A also depressed firing rates of dopamine neurons. In mice, this compound stimulated cage climbing and locomotor activity in reserpinized animals; it also antagonized D-amphetamine-stimulated locomotor activity. It produced contralateral turning in rats with unilateral lesions of the substantia nigra. These data are consistent with roles for the dopamine D2 receptor subtype as a dopamine autoreceptor and as a stimulatory, postsynaptic dopamine receptor.
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