title: Activation of the 5-HT1A receptor subtype increases rat plasma ACTH concentration.
abstract: Serotonergic (5-HT) neuronal pathways regulate the release of adrenocorticotropin hormone (ACTH) from the pituitary gland probably through the action of hypothalamic corticotropin-releasing hormone (CRH). 8-Hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT), a selective 5-HT1A receptor agonist, dose dependently (0.016-3 mg/kg s.c.) increased rat plasma ACTH concentration. This response was blocked stereoselectively by (-)-pindolol, known to have 5-HT1 antagonist properties, but not by (+)-pindolol, beta 1-, beta 2- or alpha 1-adrenoceptor, dopamine, muscarinic, 5-HT2 or 5-HT3 receptor antagonists. Similar increases of plasma ACTH were induced by other 5-HT1A receptor ligands (buspirone, ipsapirone and gepirone). These results suggest that activation of the 5-HT1A receptor induces the secretion of ACTH from the rat pituitary gland.
mesh_terms: D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D000324:Adrenocorticotropic Hormone / Q000097:blood*; D000818:Animals; D014151:Anti-Anxiety Agents / Q000494:pharmacology; D002065:Buspirone / Q000494:pharmacology; D008297:Male; D010830:Physostigmine / Q000494:pharmacology; D010869:Pindolol / Q000494:pharmacology; D011743:Pyrimidines / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D011985:Receptors, Serotonin / Q000187:drug effects / Q000502:physiology*; D013764:Tetrahydronaphthalenes / Q000494:pharmacology
chemical_list: D014151:Anti-Anxiety Agents; D011743:Pyrimidines; D011985:Receptors, Serotonin; D013764:Tetrahydronaphthalenes; C043077:ipsapirone; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D000324:Adrenocorticotropic Hormone; D010830:Physostigmine; D010869:Pindolol; C039979:gepirone; D002065:Buspirone