title: Outer membrane vesicle vaccines made from short-chain lipopolysaccharide mutants of serogroup B Neisseria meningitidis: effect of the carbohydrate chain length on the immune response.
abstract: Outer membrane vesicle (OMV) vaccines were made from Neisseria meningitidis strain 44/76 and its two short-chain lipopolysaccharide (LPS) mutants, Mu-1 and Mu-4. Only the 44/76 vaccine contained LPS with the host antigen lacto-N-neotetraose. The protein composition of the vaccines was similar. The LPS carbohydrate chain length proved to influence drastic changes in the LPS immunogenicity as well as the outer membrane proteins (OMPs) ability to elicit functional antibodies in mice. Only LPS in the Mu-1 and Mu-4 vaccines were immunogenic, and the 44/76 vaccine differed also by not inducing antibodies to the class 4 OMP. The Mu-1 vaccine, with a LPS carbohydrate chain comprising only two residues of 2-keto-3-deoxy-octonic acid, induced lower bactericidal activity and less antibodies to the class 1 OMP, compared to the two other vaccines. This indicates that LPS of a certain carbohydrate chain length is required for adequate exposure of the class 1 OMP epitopes essential for inducing bactericidal antibodies.
authors.affiliation: Department of Vaccinology, National Institute of Public Health, Torshov, Oslo, Norway.
authors.forename: S R
authors.initials: SR
authors.lastname: Andersen
authors.forename: G
authors.initials: G
authors.lastname: Bjune
authors.forename: E A
authors.initials: EA
authors.lastname: Høiby
authors.forename: T E
authors.initials: TE
authors.lastname: Michaelsen
authors.forename: A
authors.initials: A
authors.lastname: Aase
authors.forename: U
authors.initials: U
authors.lastname: Rye
authors.forename: E
authors.initials: E
authors.lastname: Jantzen
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis*; D001425:Bacterial Outer Membrane Proteins / Q000032:analysis*; D001428:Bacterial Vaccines / Q000235:genetics / Q000276:immunology*; D001770:Blood Bactericidal Activity; D002240:Carbohydrate Sequence; D006801:Humans; D008070:Lipopolysaccharides / Q000737:chemistry / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D009154:Mutation; D009345:Neisseria meningitidis / Q000235:genetics / Q000276:immunology*; D012703:Serotyping
chemical_list: D000907:Antibodies, Bacterial; D001425:Bacterial Outer Membrane Proteins; D001428:Bacterial Vaccines; D008070:Lipopolysaccharides