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A potential polyvalent Neisseria meningitidis vaccine based on a mixture of CaCl2 cell extracts from groups A, B and
J G Bisaillon1, G McSween, V Portelance
1Centre de Recherche en Microbiologie Appliquée, Institut Armand-Frappier, Université du Québec, Ville de Laval, Canada.
Abstract:
Outer membrane proteins (OMP) from Neisseria meningitidis cells of groups A, B, C and Y were extracted with CaCl2. Sodium dodecyl sulphate polyacrylamide gel electrophoresis of each extract showed a multibanded pattern characterized by the presence of three to four major proteins. Immunization of mice with individual extracts induced homologous bactericidal reactions. In addition, the extracts from groups B and C induced heterologous bactericidal reactions (B-C, C-B). The sera of mice immunized with a mixture of group A, B, and Y extracts showed a high bactericidal titre against the three N. meningitidis groups forming the mixture. Moreover, this bactericidal activity had a large spectrum against different strains from groups A, B, Y and also C. After immunization of mice with the individual extracts, each of the sera was shown by immunoblotting to contain antibodies reacting with some of the corresponding proteins. Mice immunized with the mixture showed a significant reduction of bacteraemia following challenge with either of N. meningitidis groups A, B or C. These results suggest that a mixture of OMP from different N. meningitidis groups may have the potential for a meningococcal polyvalent vaccine.
Insights
Outer membrane proteins (OMP) from Neisseria meningitidis were extracted and tested. A mixture of OMP from different groups showed broad-spectrum bactericidal activity, suggesting potential for a polyvalent meningococcal vaccine.
Area of Science:
- Microbiology
- Immunology
- Vaccinology
Background:
- Neisseria meningitidis causes bacterial meningitis, a serious global health threat.
- Current vaccines target specific serogroups, necessitating broader coverage.
Purpose of the Study:
- To investigate the immunogenic and protective potential of outer membrane proteins (OMP) from Neisseria meningitidis.
- To evaluate a polyvalent approach using OMP mixtures for broader vaccine efficacy.
Main Methods:
- Extraction of OMP from N. meningitidis groups A, B, C, and Y using CaCl2.
- Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) for protein analysis.
- Immunization of mice with individual and mixed OMP extracts, followed by bactericidal assays and immunoblotting.
Main Results:
- SDS-PAGE revealed characteristic multibanded OMP patterns.
- Immunization induced homologous and some heterologous bactericidal reactions.
- A mixture of OMP from groups A, B, and Y elicited high bactericidal titres against multiple N. meningitidis groups.
- Mice immunized with the OMP mixture showed reduced bacteraemia after challenge.
Conclusions:
- Neisseria meningitidis OMP mixtures demonstrate broad-spectrum bactericidal activity.
- A polyvalent vaccine strategy using OMP from diverse N. meningitidis groups holds promise for enhanced protection against meningococcal disease.