Abstract
An investigation of the sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) profiles of lipopolysaccharides (LPSs) extracted from seven strains of Helicobacter pylori revealed that these molecules were silver stainable and exhibited a high degree of variability in their patterns. Two strains synthesized a variety of sizes of LPS molecules such that fractionation by SDS-PAGE resulted in a stepwise gradation of bands which extended from the top to the bottom of the silver-stained gel. The LPSs from the remaining five strains were made up of molecules which were more homogeneous in size and clustered around two separate areas of the gel. Antigenic analyses of phenol-water-extracted LPSs by immunoblotting and the passive hemagglutination assay suggested that, in addition to strain-specific antigens, all of the LPSs carried a common antigen. Antibodies to this common antigen could be removed from antisera by absorption, and the resulting antisera were used to differentiate strains on the basis of their O antigens by the passive hemagglutination assay technique. The finding that LPSs from 3 of 10 clinical isolates reacted specifically in one or two of the typing antisera suggested that the development of a scheme for differentiating H. pylori on the basis of O antigens is feasible.
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