title: Responses to constant infusion of LH-RH in girls with primary hypogonadism.
abstract: To further assess quantitative pituitary gonadotropin release in patients with primary hypogonadism, a 3-hour constant infusion of the synthetic gonadotropin-releasing hormone, LH-RH, was administered to 12 functionally agonadal girls (11 with Turner syndrome and 1 who had been overiectomized), aged 9.5 to 19.42 years. Gonadotropin and sex steroid responses were determined before and during the infusion and contrasted to those in normal pubertal females. in girls with skeletal age under 11 years, mean control LH increased (P < .001) from 2.2 +/- 0.3 (mean +/- SEM) mIU/ml to 21.3 +/- 7.3 during LH-RH infusion, while luteinizing hormone (LH) rose (P < .001) from 89.2 +/- 24.6 to 276.5 +/- 42.6 girls with skeletal age over 11 years. This age-related augmentation is an exaggeration of data in normal girls and occcurs despite minimal gonadal secretion of sex steroids. A similar age-related discrepancy was not seen in follicle-stimulating hormone (FSH) secretion evoked by LH-RH; all girls had FSH increments into the castrate range with a rise from mean control levels of 78.6 +/- 6.7 to 133.9 +/- 8.3. These data demonstrate an age-related increase in LH-RH-evoked LH secretion, but not of FSH, in children and adolescents with primary hypogonadism.
mesh_terms: D000293:Adolescent; D000328:Adult; D000735:Androstenedione / Q000097:blood; D002648:Child; D003687:Dehydroepiandrosterone / Q000097:blood; D013196:Dihydrotestosterone / Q000097:blood; D004958:Estradiol / Q000097:blood; D004970:Estrone / Q000097:blood; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood*; D012739:Gonadal Steroid Hormones / Q000097:blood*; D007987:Gonadotropin-Releasing Hormone / Q000494:pharmacology*; D006801:Humans; D006908:Hydroxyprogesterones / Q000097:blood; D007006:Hypogonadism / Q000097:blood* / Q000503:physiopathology; D007030:Hypothalamo-Hypophyseal System; D007986:Luteinizing Hormone / Q000097:blood*; D011374:Progesterone / Q000097:blood; D013739:Testosterone / Q000097:blood; D014424:Turner Syndrome / Q000097:blood* / Q000503:physiopathology
chemical_list: D012739:Gonadal Steroid Hormones; D006908:Hydroxyprogesterones; D013196:Dihydrotestosterone; D004970:Estrone; D007987:Gonadotropin-Releasing Hormone; D013739:Testosterone; D000735:Androstenedione; D003687:Dehydroepiandrosterone; D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone