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Meningococcal Omp85 in Detergent‐Extracted Outer Membrane Vesicle Vaccines Induces High Levels of Non‐Functional Antibodies in Mice
Author(s) -
Wedege E.,
Lie K.,
Bolstad K.,
Weynants V. E.,
Halstensen A.,
Herstad T. K.,
Kreutzberger J.,
Nome L.,
Næss L. M.,
Aase A.
Publication year - 2013
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1111/sji.12051
Subject(s) - bacterial outer membrane , antibody , microbiology and biotechnology , biology , heterologous , virology , antigen , immune system , meningococcal disease , neisseria meningitidis , immunology , bacteria , gene , escherichia coli , biochemistry , genetics
The vaccine potential of meningococcal Omp85 was studied by comparing the immune responses of genetically modified deoxycholate‐extracted outer membrane vesicles, expressing five‐fold higher levels of Omp85, with wild‐type vesicles. Groups ( n = 6–12) of inbred and outbred mouse strains (Balb/c, C57 BL /6, OFI and NMRI ) were immunized with the two vaccines, and the induced antibody levels and bactericidal and opsonic activities measured. Except for Balb/c mice, which were low responders, the genetically modified vaccine raised high Omp85 antibody levels in all mouse strains. In comparison, the wild‐type vaccine gave lower antibody levels, but NMRI mice responded to this vaccine with the same high levels as the modified vaccine in the other strains. Although the vaccines induced strain‐dependent Omp85 antibody responses, the mouse strains showed high and similar serum bactericidal titres. Titres were negligible with heterologous or PorA‐negative meningococcal target strains, demonstrating the presence of the dominant bactericidal PorA antibodies. The two vaccines induced the same opsonic titres. Thus, the genetically modified vaccine with high Omp85 antibody levels and the wild‐type vaccine induced the same levels of functional activities related to protection against meningococcal disease, suggesting that meningococcal Omp85 is a less attractive vaccine antigen.