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Specificity of two-site immunoassays


When cross-reaction in two-site immunoassays was investigated both theoretically and experimentally it was found that such systems do not always result in enhanced specificity. Computer simulation studies indicated that substances which display negligible cross-reaction in a radioimmunoassay could produce an assay response identical to that of the analyte in a two-site immunoassay using excess antibody. Cross-reactivity in two differing two-site immunoassays was compared to that obtained in radioimmunoassays using the same monoclonal antibodies for human chorionic gonadotrophin. In addition to the effects of excess antibody, cross-reactivity was observed in one of the two-site immunoassays which could not have been predicted from the specificity of the antibodies or cross-reactivity in the radioimmunoassays. The unexpected cross-reaction of the beta subunit of human chorionic gonadotrophin in the assay resulted from an apparent alteration in the specificity of one of the antibodies following binding of the beta subunit to the second antibody. These studies emphasise the complexity of binding reactions in two-site immunoassays.

Type Journal
ISBN 0022-1759 (Print)
Authors Boscato, L. M.;Egan, G. M.;Stuart, M. C. :
Published Date 1989-01-01
Published Volume 117
Published Issue 2
Published Pages 221-9
Status Published in-print
URL link to publisher's version