FEMS Immunol Med Microbiol. 2006 Nov;48(2):237-51. Epub 2006 Sep 29.

Immunogenicity of synthetic saccharide fragments of Vibrio cholerae O1 (Ogawa and Inaba) bound to Exotoxin A.

Wade TK, Saksena R, Shiloach J, Kovác P, Wade WF.

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Department of Microbiology and Immunology, Dartmouth Medical School, Lebanon, NH 03756, USA. william.wade@dartmouth.edu

Erratum in

FEMS Immunol Med Microbiol. 2007 Mar;49(2):313.

Abstract

Recombinant exotoxin A (rEPA) from Pseudomonas aeruginosa conjugated to Vibrio cholerae O1 serotype-specific polysaccharides (mono-, di- and hexasaccharide) were immunogenic in mice. Monosaccharide conjugates boosted the humoral responses to the hexasaccharide conjugates. Prior exposure to purified Ogawa lipopolysaccharide (LPS) enabled contra-serotype hexasaccharide conjugates to boost the vibriocidal response, but Inaba LPS did not prime for an enhanced vibriocidal response by a contra-serotype conjugate. Prior exposure to the carrier, and priming B cells with the LPS of either serotype, resulted in enhanced vibriocidal titers if the Ogawa hexasaccharides were used, but a diminished response to the Inaba LPS. These studies demonstrate that the 'functional' B cell epitopes on the LPS differ from those of the neoglycoconjugates and that the order of immunization and the serotype of the boosting conjugate can influence the epitope specificity and function of the antisera.

PMID:: 17010106; [PubMed - indexed for MEDLINE]

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