title: Enzyme-linked immunosorbent assay for LY163502, a potent dopamine agonist.
abstract: A rapid and sensitive enzyme-linked immunosorbent assay (ELISA) for the potent selective dopaminergic receptor (D2) agonist, LY163502, is described. The ELISA is a competitive assay in which peroxidase-labeled LY163502 competes with unlabeled LY163502 for binding to solid-phase antibodies specific for LY163502. The limit of detection is 8 pg/mL; intra- and interassay coefficients of variation are 7.2 and 12.3% respectively, for human plasma determinations. Recovery of LY163502 from plasma and urine is quantitative. We found two potential metabolites of LY163502, despropyl-LY163502 and N-oxide LY163502, to be 44 and 0.5% cross-reactive at the ED50 level, respectively. However, LY163502 levels measured by the ELISA and by a specific gas-liquid chromatography (GLC) assay are highly correlated [Pearson's correlation coefficient, r = 0.964]. This suggests that the ELISA assay of biological fluids is not affected by cross-reactivity due to LY163502 metabolites. Application of the ELISA to the measurement of LY163502 in biological fluids is demonstrated.
mesh_terms: D000284:Administration, Oral; D000818:Animals; D002849:Chromatography, Gas; D003429:Cross Reactions; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D008297:Male; D011804:Quinolines / Q000032:analysis* / Q000276:immunology; D011817:Rabbits; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D011804:Quinolines; C047726:quinelorane