title: Frequent serum sampling in healthy men discloses testosterone peaks exacerbated by testosterone propionate administration.
abstract: Interval samplings uncover blood diurnal oscillations for several hormones, highlighting the importance of short time intervals in the disclosure of subtle pulsatile patterns of some peptide hormones, namely LH. In a study designed to develop new probes against steroid misuse, venous blood was sampled at 5-min intervals for 4 hours from 12 eugonadal adult male athletes, 6 receiving transcutaneous administrations of testosterone propionate and 6 placebo subjects. Brief supraphysiologic serum testosterone peaks were disclosed, the amplitude and frequency of these peaks being larger for the treated group. No solid explanation could be given to explain these bursts. Neither the binding/dissociation kinetics of SHBG molecules with and without increased circulating level of dihydrotestosterone, nor brief testosterone-inducing LH bursts, nor increased Leydig cell release could be invoked to explain these peaks. Their occurrence, although relatively rare, could represent a threat and lead to improper treatment.
authors.affiliation: Institut National de la Recherche Scientifique-Santé, Pointe-Claire.
authors.forename: G R
authors.initials: GR
authors.lastname: Brisson
authors.forename: A
authors.initials: A
authors.lastname: Guttiérez Sáinz
authors.forename: C
authors.initials: C
authors.lastname: Ayotte
authors.forename: R
authors.initials: R
authors.lastname: Gareau
authors.forename: L
authors.initials: L
authors.lastname: Senécal
authors.forename: M J
authors.initials: MJ
authors.lastname: Castillo
mesh_terms: D000279:Administration, Cutaneous; D000328:Adult; D018931:Antineoplastic Agents, Hormonal / Q000008:administration & dosage / Q000493:pharmacokinetics*; D002940:Circadian Rhythm / Q000502:physiology*; D006801:Humans; D008297:Male; D012016:Reference Values; D013048:Specimen Handling / Q000379:methods*; D013739:Testosterone / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics*
chemical_list: D018931:Antineoplastic Agents, Hormonal; D013739:Testosterone