Development of a simple, rapid sandwich enzyme immunoassay for the measurement of serum rat LH

J. C. Illera, C. J. Munro, G. Silvan, Robert Bondurant, M. Illera

Research output: Contribution to journalArticle

8 Scopus citations

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 μl (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 μl) 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 μl) 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.

Original languageEnglish (US)
Pages (from-to)95-102
Number of pages8
JournalJournal of Physiology and Biochemistry
Volume52
Issue number2
StatePublished - Dec 1 1996

Keywords

  • Enzyme immunoassay
  • LH EIA
  • Rat LH

ASJC Scopus subject areas

  • Physiology
  • Biochemistry

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