title: Nocturnal melatonin levels are unaltered by ovarian suppression in girls with central precocious puberty.
abstract: Girls with central precocious puberty were utilized as a model in which to study the melatonin secretory response to ovarian suppression. Eight girls with central precocious puberty documented by clinical and endocrine characteristics, including sleep-entrained augmentation of luteinizing hormone (LH) pulsatility, were investigated. Nocturnal (6:00 P.M. to 9:00 A.M.) plasma melatonin levels were measured hourly by a sensitive and specific radioimmunoassay before and after gonadotropin-ovarian downregulation with gonadotropin-releasing hormone (GnRH)-agonist. Although nocturnal melatonin elevations varied widely between girls, patterns within the same individual were remarkably reproducible and unaltered before and after treatment. Although estrogens have been shown to modulate melatonin synthesis and secretion, in this model, reduction of estrogen levels was not associated with alterations in plasma melatonin concentrations.
authors.affiliation: Department of Reproductive Medicine, University of California, San Diego School of Medicine.
authors.forename: S L
authors.initials: SL
authors.lastname: Berga
authors.forename: K L
authors.initials: KL
authors.lastname: Jones
authors.forename: S
authors.initials: S
authors.lastname: Kaufmann
authors.forename: S S
authors.initials: SS
authors.lastname: Yen
mesh_terms: D002648:Child; D002675:Child, Preschool; D002940:Circadian Rhythm; D004958:Estradiol / Q000097:blood; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D007987:Gonadotropin-Releasing Hormone / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors* / Q000627:therapeutic use; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D007986:Luteinizing Hormone / Q000097:blood; D008550:Melatonin / Q000097:blood*; D011629:Puberty, Precocious / Q000097:blood*; D013739:Testosterone / Q000097:blood
chemical_list: D007987:Gonadotropin-Releasing Hormone; D013739:Testosterone; D004958:Estradiol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; C029256:histrelin; D008550:Melatonin; D006854:Hydrocortisone