title: Urinary marker of oral pregnenolone administration.
abstract: Pregnenolone (PREG) can potentially be abused by athletes to maintain an equilibration of the steroidal environment after sex steroids administrations. Five men volunteers orally ingested 50 mg PREG to determine optimal urinary markers for detection of this steroid. Our findings show that ingestion of PREG has no significant effects on the testosterone/epitestosterone (T/E) and testosterone/luteinizing hormone (T/LH) ratios, whereas variable changes on the carbon isotopic values of three T metabolites: androsterone, etiocholanolone, 5beta-androstane-3alpha,17beta-diol (5beta-androstanediol) together with 16(5alpha)-androsten-3alpha-ol (androstenol) and 5beta-pregnane-3alpha,20alpha-diol (pregnanediol) have been observed. The difference between the carbon isotopic values (delta13C-values) of androstenol and pregnanediol is potentially the most reliable marker of exogenous PREG administration in males. For all subjects, the differences differ by 3.0 per thousand or more over a period of about 10 h and for both of them the detection window for positivity is extended over 40 h.
authors.affiliation: Laboratoire Suisse d'Analyse du Dopage, Institut Universitaire de Médecine Légale, Rue du Bugnon 21, 1005 Lausanne, Switzerland. christophe.saudan@chuv.ch
authors.forename: Christophe
authors.initials: C
authors.lastname: Saudan
authors.forename: Aurélien
authors.initials: A
authors.lastname: Desmarchelier
authors.forename: Pierre-Edouard
authors.initials: PE
authors.lastname: Sottas
authors.forename: Patrice
authors.initials: P
authors.lastname: Mangin
authors.forename: Martial
authors.initials: M
authors.lastname: Saugy
mesh_terms: D000284:Administration, Oral; D000328:Adult; D015113:Androstane-3,17-diol / Q000652:urine; D000737:Androstenols / Q000652:urine; D000738:Androsterone / Q000652:urine; D002244:Carbon / Q000737:chemistry / Q000378:metabolism; D004300:Doping in Sports; D004845:Epitestosterone / Q000652:urine; D005043:Etiocholanolone / Q000652:urine; D006801:Humans; D007986:Luteinizing Hormone / Q000652:urine; D008297:Male; D008875:Middle Aged; D011276:Pregnanediol / Q000652:urine; D011284:Pregnenolone / Q000008:administration & dosage* / Q000652:urine*; D015813:Substance Abuse Detection / Q000379:methods*; D013739:Testosterone / Q000652:urine; D013997:Time Factors
chemical_list: D000737:Androstenols; D015113:Androstane-3,17-diol; D013739:Testosterone; D004845:Epitestosterone; D011284:Pregnenolone; D002244:Carbon; D007986:Luteinizing Hormone; D005043:Etiocholanolone; D000738:Androsterone; D011276:Pregnanediol