title: In vivo and in vitro studies in a 46, XY phenotypically female infant with 17-ketosteroid reductase deficiency.
abstract: A 46, XY phenotypically female infant with 17-ketosteroid reductase (17-KSR) showed normal plasma androgens for chromosomal sex shortly after birth, but did not show the physiologic testosterone rise. One intramuscular injection with human chorionic gonadotropin resulted in high ratios between androstenedione/testosterone and dehydroepiandrosterone/delta 5-androstenediol, confirming the diagnosis. In spermatic vein plasma similarly elevated ratios were found. A urinary steroid profile revealed elevated levels of metabolites of 17-OH-progesterone and androstenedione. In vitro studies in testicular tissue showed a decreased capacity of 17-ketosteroid reductase, the reduction capacity being more affected than the oxidation capacity. The activity of 3 beta-hydroxysteroid-dehydrogenase was slightly increased. The serial analysis of plasma androgens provides more insight in the natural history of 17-ketosteroid reductase.
authors.affiliation: Department of Pediatrics, University Hospital for Children and Youth, Het Wilhelmina Kinderziekenhuis, Utrecht, The Netherlands.
authors.forename: J M
authors.initials: JM
authors.lastname: Wit
authors.forename: C O
authors.initials: CO
authors.lastname: van Hooff
authors.forename: J H
authors.initials: JH
authors.lastname: Thijssen
authors.forename: J L
authors.initials: JL
authors.lastname: Van den Brande
mesh_terms: D015067:17-Hydroxysteroid Dehydrogenases / Q000172:deficiency* / Q000652:urine; D015096:3-Hydroxysteroid Dehydrogenases / Q000378:metabolism; D000728:Androgens / Q000097:blood; D000735:Androstenedione / Q000097:blood; D006063:Chorionic Gonadotropin; D003687:Dehydroepiandrosterone / Q000031:analogs & derivatives / Q000097:blood; D019314:Dehydroepiandrosterone Sulfate; D013196:Dihydrotestosterone / Q000097:blood; D012734:Disorders of Sex Development / Q000378:metabolism*; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D011944:Receptors, Androgen / Q000378:metabolism; D013739:Testosterone / Q000097:blood
chemical_list: D000728:Androgens; D006063:Chorionic Gonadotropin; D011944:Receptors, Androgen; D013196:Dihydrotestosterone; D013739:Testosterone; D000735:Androstenedione; D003687:Dehydroepiandrosterone; D019314:Dehydroepiandrosterone Sulfate; D015067:17-Hydroxysteroid Dehydrogenases; D015096:3-Hydroxysteroid Dehydrogenases