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Use of Monoclonal Antibodies to Identify the Distribution of A and M Epitopes on Smooth Brucella Species

Overview
Specialty Microbiology
Date 1988 Jul 1
PMID 2457599
Citations 20
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Abstract

The smooth types of Brucella species express two lipopolysaccharides (LPSs) (A and M) which are antigenically distinct. Their existence as cross-reactive antigenic complexes makes definitive serology difficult. Murine hybridomas were produced and selected for their ability to produce monoclonal antibodies to the specific A- or M-LPS epitopes. The specificity of the monoclonal antibodies was determined by microplate enzyme-linked immunoassay, binding inhibition assay, microplate agglutination, and dot blot assay. Monoclonal antibody 12AE6 was specific for an epitope on the A LPS of Brucella spp., which was also expressed on Yersinia enterocolitica O:9. A unique epitope of M LPS was detected by monoclonal antibody 33.1.5. The two monoclonal antibodies did not exhibit cross-reactions when assayed with whole Brucella cells or purified M- and A-LPS preparations. Cross-reactive serology with polyvalent sera can be attributed to the presence of common antigenic determinants on both molecules. The use of A- and M-LPS-specific monoclonal antibodies has the potential to replace the more laborious methods involved in the production of monospecific sera.

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