title: Luteinizing hormone pulse frequency and in vitro bioactivity in male idiopathic infertility.
abstract: We investigated 51 patients with idiopathic oligospermia and 10 control subjects. Blood samples were collected every 20 minutes from 10 P.M. to 10 A.M. and luteinizing hormone (LH) pulsatility was analyzed. A pool of all samples obtained from each subject was used to measure bioactive LH in an in vitro mouse Leydig cell bioassay and immunoactive LH in an immunoradiometric assay. Mean immunoactive LH pulse frequency was higher and mean bioactive to immunoactive LH ratio was lower in infertile men than in controls. There was a significant negative correlation between bioactive LH to immunoreactive LH ratio and LH pulse frequency. These data indicate that the defect in the gonadal axis in oligospermic men resides not in the hypothalamic-pituitary function but rather in the testis itself.
authors.affiliation: Service d'Endocrinologie, Centre Hospitalier Universitaire de Toulouse, Hôpital Purpan and Hôpital La Grave, France.
authors.forename: A
authors.initials: A
authors.lastname: Bennet
authors.forename: L
authors.initials: L
authors.lastname: Bujan
authors.forename: M
authors.initials: M
authors.lastname: Plantavid
authors.forename: P
authors.initials: P
authors.lastname: Barbe
authors.forename: P
authors.initials: P
authors.lastname: Caron
authors.forename: J P
authors.initials: JP
authors.lastname: Louvet
mesh_terms: D000328:Adult; D001681:Biological Assay; D004958:Estradiol / Q000097:blood; D005640:Follicle Stimulating Hormone / Q000097:blood; D006801:Humans; D015592:Immunoradiometric Assay; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D009845:Oligospermia / Q000378:metabolism*; D011673:Pulsatile Flow
chemical_list: D004958:Estradiol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone