title: Pharmacological characterization of release-regulating serotonin autoreceptors in rat cerebellum.
abstract: The release of [3H]5-hydroxytryptamine ([3H]5-HT) evoked by 15 mM KCl in superfused rat cerebellum synaptosomes was inhibited by 5-HT (pEC30 = 8.73). Methiothepin antagonized 5-HT (pA2 = 9.28); ketanserin, methysergide, cinanserin and spiperone were ineffective. The receptors involved were activated (pEC30 = 8.90) by the 5-HT1 agonist 5-methoxy-3-[1,2,3,6-tetrahydropyridin-4-yl]-1H-indole (RU 24969) X (-)Propranolol shifted to the right (pA2 = 8.05) the dose-response curve of 5-HT. The 5-HT1A agonist 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) was ineffective. In conclusion, autoreceptors are present on 5-HT nerve endings in rat cerebellum and appear to belong to the 5-HT1B subtype.
mesh_terms: D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D000818:Animals; D002531:Cerebellum / Q000187:drug effects / Q000502:physiology*; D066298:In Vitro Techniques; D007211:Indoles / Q000494:pharmacology; D008297:Male; D008719:Methiothepin / Q000494:pharmacology; D011433:Propranolol / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D011985:Receptors, Serotonin / Q000187:drug effects / Q000502:physiology*; D012701:Serotonin / Q000378:metabolism; D013574:Synaptosomes / Q000187:drug effects / Q000502:physiology; D013764:Tetrahydronaphthalenes / Q000494:pharmacology
chemical_list: D007211:Indoles; D011985:Receptors, Serotonin; D013764:Tetrahydronaphthalenes; C025145:5-methoxy 3-(1,2,3,6-tetrahydro-4-pyridinyl)1H indole; D012701:Serotonin; D008719:Methiothepin; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D011433:Propranolol