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. 1992 Aug;60(8):3098–3104. doi: 10.1128/iai.60.8.3098-3104.1992

Selection of an escape variant of Borrelia burgdorferi by use of bactericidal monoclonal antibodies to OspB.

J L Coleman 1, R C Rogers 1, J L Benach 1
PMCID: PMC257287  PMID: 1639477

Abstract

Two immunoglobulin G (IgG) monoclonal antibodies (MAbs) to outer surface protein B (CB2 and CB6), affinity purified from mouse ascitic fluid, exhibited concentration-dependent inhibitory and bactericidal properties against Borrelia burgdorferi after a 24-h incubation period in spirochete medium. Fab fragments derived from these MAbs showed the same effects, indicating that they were not caused by agglutination of the organisms by the intact MAbs. The inhibition of spirochete growth in cultures containing MAbs was also detected by spectrophotometric analysis of the media. CB2 did not inhibit the growth of Borrelia hermsii or the BEP4 strain of B. burgdorferi, neither of which is recognized by the MAb. Affinity-purified IgG from hybridoma supernatants had similar effects on B. burgdorferi as the ascitic-fluid-derived IgG did, indicating that the inhibitory and bactericidal properties were not due to nonspecific toxic contaminants. The bactericidal properties of the MAbs were not complement dependent as there was none in the serum-free system. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis of B. burgdorferi organisms surviving after exposure to CB2 revealed an escape variant which failed to express OspB. The continued presence of OspA in these escape variants indicates that the lack of OspB was not due to the loss of the plasmid which contains the genes for both of these proteins.

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Selected References

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