title: Contribution of the mannan O side-chains to the adjuvant action of lipopolysaccharides.
abstract: Klebsiella 03 lipopolysaccharide (LPS) and Escherichia coli 09 LPS were previously shown to have potent adjuvant activities in augmenting antibody response and delayed-type hypersensitivity to protein antigens. The R form LPS extracted from the O-specific polysaccharide-less mutants derived from Klebsiella 03 and E. coli 09 strains were characterized by chemical and electrophoretic analyses. The adjuvant activities of the R-LPS in augmenting antibody response and DTH to protein antigens were much weaker than those of the parental LPS. The strength of the adjuvant activities of the R-LPS was similar to that of the activities of Salmonella minnesota LPS and Ra-LPS. By contrast, polyclonal B-cell activation effects of the R-LPS were stronger than those of the parental LPS. The common feature of the parental LPS is that their O-specific polysaccharides are mannose homopolymers (mannans). From these results, it is suggested that mannose homopolymers as the O side-chains of LPS contribute to the action of LPS in enhancing strongly the T-cell dependent immune responses to protein antigens.
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology*; D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000096:biosynthesis; D055598:Chemical Phenomena; D002621:Chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000378:metabolism; D005260:Female; D006968:Hypersensitivity, Delayed; D007711:Klebsiella pneumoniae / Q000378:metabolism; D008070:Lipopolysaccharides / Q000276:immunology*; D008213:Lymphocyte Activation; D008351:Mannans / Q000276:immunology*; D051379:Mice; D008815:Mice, Inbred Strains; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D012475:Salmonella / Q000378:metabolism; D005719:gamma-Globulins / Q000276:immunology
chemical_list: D000276:Adjuvants, Immunologic; D000888:Antibodies, Anti-Idiotypic; D008070:Lipopolysaccharides; D008351:Mannans; D011135:Polysaccharides, Bacterial; D005719:gamma-Globulins