title: Development of a simple, rapid sandwich enzyme immunoassay for the measurement of serum rat LH.
abstract: The present study describes the development and validation of a rapid, sensitive, specific and precise enzyme immunoassay (EIA) sandwich suitable for measuring luteinizing hormone (LH) in rat serum. Ninety-six well polystyrene microtiter plates were coated with 100 microliters (250 ng/ml) of a well-characterized monoclonal antibody (518B7, Roser, UC Davis) generated against bovine LH. A polyclonal antiserum raised in rabbits against ovine FSH (G4-215B, Papkoff) was conjugated to sodium periodate-activated horseradish peroxidase (HRP), and used as the second antibody of the sandwich assay. This anti-ovine FSH antiserum cross-reacted more than 200% with rat LH. Standards (r-LH-RP-3, NIADDK, range 0 pg/well to 2.5 ng/well or 100 microliters) diluted in a 3(N-Morpholino) propane sulfonic acid (MOPS) buffer, or serum, were incubated with the solid phase antibody for 2 hours. Plates were washed and the anti-oFSH:HRP (100 microliters) in MOPS buffer was added and incubated a further 2 hours before a second wash and the addition of the substrate (TMB, 3,3',5,5'-tetramethylbenzidine dihydrochloride and H2O2). The least detectable concentration of LH was 16.1 +/- 1.42 pg/ml. The recovery of known concentrations of LH added to several samples was 93.5 +/- 1.70%. Mean intra-assay and inter-assay coefficients of variation (%) were less than 10% (n = 20). The anti-FSH:HRP showed less than 8.0% cross reactivity with rFSH in this LH EIA system. The correlation coefficient (r) of samples analyzed by EIA in parallel with RIA was r = 0.90 (p < 0.001, n = 26). Results showed levels between 105.21 and 633.87 pg/ml. This new LH EIA sandwich offers a stable, rapid, and improved EIA system for the measurement of serum LH concentrations of this species over previously reported methods.
authors.affiliation: Departamento de Fisiología Animal, Facultad de Veterinaria, UCM, Madrid, Spain.
authors.forename: J C
authors.initials: JC
authors.lastname: Illera
authors.forename: C J
authors.initials: CJ
authors.lastname: Munro
authors.forename: G
authors.initials: G
authors.lastname: Silvan
authors.forename: R H
authors.initials: RH
authors.lastname: BonDurant
authors.forename: M
authors.initials: M
authors.lastname: Illera
mesh_terms: D000818:Animals; D002417:Cattle; D003429:Cross Reactions; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D013006:Growth Hormone / Q000097:blood; D007124:Immunoenzyme Techniques; D007986:Luteinizing Hormone / Q000097:blood*; D011388:Prolactin / Q000097:blood; D011817:Rabbits; D011863:Radioimmunoassay; D051381:Rats; D017208:Rats, Wistar; D012756:Sheep; D013972:Thyrotropin / Q000097:blood
chemical_list: D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D013972:Thyrotropin; D013006:Growth Hormone