PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8029274-3 1994 Potentiation of clonidine"s effect on growth hormone levels following short-term lithium treatment appears most likely due to increased serotonergic function as a consequence of enhanced 5-HT concentrations at postsynaptic 5-HT1C receptor sites. Clonidine 16-25 5-hydroxytryptamine receptor 2C Rattus norvegicus 223-229 1356149-4 1992 In contrast, pretreatment with the non-selective 5-HT1/2 antagonist, metergoline, and the 5-HT1C/5-HT2-selective antagonist, mesulergine, reduced clonidine-induced increases in growth hormone levels 81 to 87% without affecting clonidine-induced decreases in locomotor activity. Clonidine 146-155 5-hydroxytryptamine receptor 2C Rattus norvegicus 90-96 1356149-4 1992 In contrast, pretreatment with the non-selective 5-HT1/2 antagonist, metergoline, and the 5-HT1C/5-HT2-selective antagonist, mesulergine, reduced clonidine-induced increases in growth hormone levels 81 to 87% without affecting clonidine-induced decreases in locomotor activity. Clonidine 227-236 5-hydroxytryptamine receptor 2C Rattus norvegicus 90-96 1356149-5 1992 Two other 5-HT1C/5-HT2 antagonists, ritanserin and mianserin, also attenuated (47%) clonidine-induced increases in growth hormone levels. Clonidine 84-93 5-hydroxytryptamine receptor 2C Rattus norvegicus 10-16 1356149-9 1992 These findings suggest that clonidine stimulates growth hormone secretion by activation of alpha 2 adrenergic heteroreceptors present on 5-HT nerve terminals which, in turn, enhance 5-HT activity via stimulation of postsynaptic 5-HT1C receptors to promote growth hormone releasing factor. Clonidine 28-37 5-hydroxytryptamine receptor 2C Rattus norvegicus 228-234 8145893-5 1994 These findings suggest that development of functional subsensitivity of either alpha 2-adrenergic heteroreceptors or 5-HT1C receptors mediating clonidine-induced growth hormone secretion following chronic treatment with glucocorticoids and 5-HT uptake inhibitors. Clonidine 144-153 5-hydroxytryptamine receptor 2C Rattus norvegicus 117-123