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This study was performed to investigate whether the blockade of cholinergic muscarinic and adrenergic pathways was involved in the GH-releasing effect of GH-releasing peptide-2 (GHRP-2) in ovariectomized ewes. Cholinergic muscarinic antagonist, atropine (0.2 mg/kg, i.v., 15 min before GHRP-2 administration) blunted the GH secretion caused by GHRP-2 (12.5 microg/kgBW). alpha-Adrenergic antagonist phentolamine (15 microg/kgBW x min, infusion from -15 to 30 min) did not affect the GH response to GHRP-2, and beta-adrenergic antagonist propranolol (0.25 mg/kgBW, i.v., 15 min before GHRP-2 administration) did not suppress the GHRP-2-induced GH release. These results showed that cholinergic muscarinic antagonist agent, atropine, exerts an inhibitory effect on GHRP-2-induced GH secretion in ovariectomized ewes.

endocrine journal

Effects of Muscarinic and Adrenergic Blockade on Growth Hormone Secretion Induced by Growth Hormone-Releasing Peptide-2 (GHRP-2) in Ovariectomized Ewes.