title: Reactivity of different LH and FSH standards and preparations in the world health organization matched reagents for enzyme-linked immunoassays of gonadotrophins.
abstract: The immunoreactivity of various LH and FSH calibration standards and recombinant preparations in the enzyme-linked immunoassay (EIA) systems for gonadotrophins developed for the Special Programme of Research in Human Reproduction of the World Health Organization (WHO) were compared. The preparations tested included three LH and two FSH pituitary standards (calibrated against LH 80/552 and 68/40 and FSH 78/549 respectively) provided with the EIA or radioimmunoassay WHO matched reagent kits, the pituitary preparation LER-907, and recombinant human LH (rhLH) and FSH (rhFSH). Simultaneous curve fitting of the EIA dose-response curves revealed no significant differences among the slopes generated by the WHO LH standards and LER-907; in contrast, no parallelism was found between the curves of rhLH and the pituitary-derived LH standards. No significant differences were found among the slopes of the curves elicited by the pituitary and recombinant FSH preparations. Each LH preparation exhibited a high degree of charge heterogeneity. Considerable variations in charge isoform distribution among the WHO LH standards, rhLH and LER-907 were also evident. In contrast, the FSH preparations were less heterogeneous and exhibited minor differences in charge distribution. Despite the existing differences in charge isoform distribution, all the pituitary-derived preparations as well as rhFSH seem appropriate for using as calibration standards in this particular EIA system.
authors.affiliation: Research Unit in Developmental Biology, Hospital de Pediatría, Centro Médico Nacional S. XXI, IMSS, Mexico.
authors.forename: A
authors.initials: A
authors.lastname: Olivares
authors.forename: M
authors.initials: M
authors.lastname: Cárdenas
authors.forename: C
authors.initials: C
authors.lastname: Timossi
authors.forename: T
authors.initials: T
authors.lastname: Zariñán
authors.forename: V
authors.initials: V
authors.lastname: Díaz-Sánchez
authors.forename: A
authors.initials: A
authors.lastname: Ulloa-Aguirre
mesh_terms: D000818:Animals; D016466:CHO Cells; D002138:Calibration; D006224:Cricetinae; D004305:Dose-Response Relationship, Drug; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D005640:Follicle Stimulating Hormone / Q000097:blood / Q000592:standards*; D006801:Humans; D007986:Luteinizing Hormone / Q000097:blood / Q000592:standards*; D010902:Pituitary Gland / Q000378:metabolism; D011933:Reagent Kits, Diagnostic; D011994:Recombinant Proteins; D012015:Reference Standards; D014944:World Health Organization
chemical_list: D011933:Reagent Kits, Diagnostic; D011994:Recombinant Proteins; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone