Hormonal and metabolic responses to an enkephalin analogue in normal man.
An enkephalin analogue [D-Ala2, MePhe4, Met(o)-ol] enkephalin (DAMME), given intravenously to normal subjects raised serum prolactin and growth-hormone levels but lowered serum levels of luteinising hormone, follicle-stimulating hormone, cortisol, and corticotrophin. There was also a small fall in total glucagon and gastric inhibitory peptide (G.I.P.) and a rise in thyrotrophin. beta-Lipotrophin, motilin, vasoactive intestinal peptide, insulin, gastrin, and pancreatic glucagon were unchanged. Blood-glycerol increased, and blood lactate, alanine, and glucose fell. Prior administration of the opiate antagonist, naloxone, attenuated the hormonal responses to DAMME. This enkephalin analogue produces endocrine and metabolic changes in man which may be mediated through opiate-binding receptors both within and outside the brain. The enkephalins and related substances may provide an important link between perception, behaviour, and neuroendocrine regulation of hormone secretion and metabolism.
D000324:Adrenocorticotropic Hormone / Q000037:antagonists & inhibitors; D000328:Adult; D000409:Alanine / Q000097:blood; D001786:Blood Glucose / Q000032:analysis*; D002986:Clinical Trials as Topic; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000008:administration & dosage / Q000494:pharmacology*; D005640:Follicle Stimulating Hormone / Q000037:antagonists & inhibitors; D005749:Gastric Inhibitory Polypeptide / Q000037:antagonists & inhibitors; D005768:Gastrointestinal Hormones / Q000097:blood*; D005934:Glucagon / Q000037:antagonists & inhibitors; D005990:Glycerol / Q000097:blood; D013006:Growth Hormone / Q000097:blood; D006801:Humans; D006854:Hydrocortisone / Q000037:antagonists & inhibitors / Q000097:blood*; D007275:Injections, Intravenous; D007328:Insulin / Q000097:blood*; D007986:Luteinizing Hormone / Q000037:antagonists & inhibitors; D008297:Male; D010908:Pituitary Hormones, Anterior / Q000097:blood*; D011388:Prolactin / Q000097:blood; D012107:Research Design; D013972:Thyrotropin / Q000097:blood
D001786:Blood Glucose; D004723:Endorphins; D004745:Enkephalins; D005768:Gastrointestinal Hormones; D007328:Insulin; D010908:Pituitary Hormones, Anterior; D005749:Gastric Inhibitory Polypeptide; D000324:Adrenocorticotropic Hormone; D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D013972:Thyrotropin; D013006:Growth Hormone; D005934:Glucagon; D000409:Alanine; D005990:Glycerol; D006854:Hydrocortisone