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Functionally active monoclonal antibody that recognizes an epitope on the O side chain of Pseudomonas aeruginosa immunotype-1 lipopolysaccharide.

ABSTRACT

A murine monoclonal antibody (MAb) was prepared against Pseudomonas aeruginosa immunotype-1 (It-1) lipopolysaccharide (LPS). The MAb bound It-1 LPS in the enzyme-linked immunosorbent assay and in the immunodiffusion and immunoblotting assays, agglutinated and opsonized It-1 bacteria, and protected against challenge with live It-1 organisms in a murine burn infection model. All of these activities were immunotype specific. Correlation of the opsonic and protective properties of the MAb with its recognition site on the LPS O side chain confirmed that such immunotype-specific determinants are important targets for protective antibodies in Pseudomonas disease. The functional equivalence of this MAb and polyclonal antibodies from hyperimmune plasma underscores the therapeutic potential of single MAbs which recognize critical determinants in the LPS O side chain.

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