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Production and Characterization of Monoclonal Antibodies to Type 8 Lipooligosaccharide of Neisseria Meningitidis

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Specialty Microbiology
Date 1992 Aug 1
PMID 1380009
Citations 7
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Abstract

Eight monoclonal antibodies (MAbs) to lipooligosaccharides (LOSs) of Neisseria meningitidis were produced by immunizing mice with purified LOS from group A meningococcal strain A1. The specificities of the MAbs were examined by enzyme-linked immunosorbent assay (ELISA), immunodot assay, and ELISA inhibition by using the homologous A1 LOS, 12 immunotype LOSs of N. meningitidis (L1 through L12), and LOSs or lipopolysaccharides from other gram-negative bacteria. Two of the MAbs, 4385G7 (immunoglobulin G2b [IgG2b]) and 4387A5 (IgG2a), had the strongest reactivities with the homologous A1 LOS, moderate reactivities with the M978 (L8) LOS, but no reactivity with other LOSs. The other six MAbs (4 IgM and 2 IgG3) reacted with the A1 LOS and with several or many of the 12 LOSs. ELISA inhibition at 50% showed that the inhibitory activities of the LOSs from strains A1 and BB431 (a group B strain) to the specific MAb 4387A5 were about 10 to 20 times greater than that of the M978 (L8) LOS. When compared with MAb 2-1-L8 (L8) by Western blot (immunoblot) analysis and ELISA inhibition, the two specific MAbs recognized a different epitope in the 3.6-kDa LOSs of strains A1 and BB431. We propose that the new epitope is L8a, since the MAbs also reacted with the M978 (L8) LOS. The expression of the L8a epitope in the A1 LOS requires a few monosaccharide residues in its oligosaccharide moiety, and the fatty acid residues in its lipid A moiety also play a role. In a whole-cell ELISA, the two specific MAbs bound specifically to the homologous strain A1 and the L8 prototype strain M978 but not to any other LOS prototype strains. These results suggest that the two specific MAbs can be used for LOS typing of N. meningitidis.

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