Van Kampen J, Frydryszak H, Stoessl AJ. Behavioural evidence for cholecystokinin-dopamine D1 receptor interactions in the rat.
Eur J Pharmacol 1996;
298:7-15. [PMID:
8867913 DOI:
10.1016/0014-2999(95)00767-9]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The effects of cholecystokinin (CCK) on behavioural responses to the dopamine D1 receptor agonist (+/- )SKF 38393 ((+/- )-2,3,4,5-tetrahydro-7,8- dihydroxy-1-phenyl-1H-3-benzazepine HCl) were studied in the rat. SKF 38393 (5 mg/kg s.c.) induced stereotyped grooming and vacuous chewing movements. Both responses were inhibited by CCK-8S (10-50 micrograms/kg i.p.), but the preferential CCKB receptor agonist CCK-4 (20-100 micrograms/kg i.p.) attenuated SKF 38393-induced grooming only. Suppression of SKF 38393-induced grooming and vacuous chewing movements by CCK-8S was blocked by the selective CCKA receptor antagonist MK-329 (also known as devazepide or L-364,718) (0.1, 0.3 mg/kg i.p.) but unaffected by the CCKB receptor antagonist L-365,260 (0.1, 0.3 mg/kg i.p.). We conclude that CCK can modify dopamine-mediated behavioural responses, possibly reflecting an action post-synaptic to dopamine terminals. The effect on dopamine D1 receptor agonist-induced vacuous chewing movements is probably mediated by CCKA receptors, while the effect on grooming may reflect an interaction with the CCKA receptor and/or a novel CCKB receptor subtype.
Collapse