title: Metyrapone effects on beta-endorphin, ACTH and cortisol levels after chronic opiate receptor stimulation in man.
abstract: The aim of this study was to evaluate beta-endorphin, ACTH, and cortisol plasma levels during metyrapone administration in man after chronic opioid receptor stimulation. Metyrapone (750 mg every 4 hr for 6 doses) was administered to ten male heroin addicts, who had been on a maintenance therapy with methadone for at least 6 months and to ten healthy sex- and age-matched volunteers. Before metyrapone administration the basal levels of cortisol and ACTH were significantly decreased in addicts as compared to normal controls, while plasma beta-endorphin was not different. The response of beta-endorphin and ACTH to metyrapone administration was significantly blunted in addicts (p less than 0.01). These results suggest that the chronic stimulation of opiate receptors can impair the function of the anterior pituitary gland.
authors.affiliation: Clinica Medica Generale e Terapia Medica, Università di Parma, Italy.
authors.forename: P P
authors.initials: PP
authors.lastname: Vescovi
authors.forename: G
authors.initials: G
authors.lastname: Gerra
authors.forename: L
authors.initials: L
authors.lastname: Maninetti
authors.forename: M
authors.initials: M
authors.lastname: Pedrazzoni
authors.forename: M
authors.initials: M
authors.lastname: Michelini
authors.forename: G
authors.initials: G
authors.lastname: Pioli
authors.forename: G
authors.initials: G
authors.lastname: Girasole
authors.forename: R
authors.initials: R
authors.lastname: Caccavari
authors.forename: D
authors.initials: D
authors.lastname: Maestri
authors.forename: M
authors.initials: M
authors.lastname: Passeri
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000097:blood*; D000328:Adult; D006556:Heroin Dependence / Q000097:blood*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D008297:Male; D008691:Methadone; D008797:Metyrapone / Q000494:pharmacology*; D011957:Receptors, Opioid / Q000502:physiology; D012016:Reference Values; D019966:Substance-Related Disorders / Q000097:blood; D001615:beta-Endorphin / Q000097:blood*
chemical_list: D011957:Receptors, Opioid; D001615:beta-Endorphin; D000324:Adrenocorticotropic Hormone; D008691:Methadone; D006854:Hydrocortisone; D008797:Metyrapone