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Identification of immunogenic outer membrane vesicle vaccine antigen components using a meningococcal protein
F Ramirez-Bencomo1, A Thistlethwaite1, V Viviani2
1School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.
Vaccine
|March 5, 2025
Summary
Outer membrane vesicle (OMV) vaccines combat meningococcal disease. Researchers identified key OMV antigens, like FetA and PorB, that trigger protective antibody responses and aid complement-dependent killing of bacteria.
Area of Science:
- Vaccinology
- Immunology
- Microbiology
Background:
- Outer membrane vesicle (OMV)-based vaccines are crucial for controlling Neisseria meningitidis outbreaks.
- The multifaceted composition of OMVs complicates the identification of specific antigens responsible for protective immunity.
Purpose of the Study:
- To identify specific Outer Membrane Proteins (OMPs) within OMVs that elicit protective immune responses.
- To correlate antibody binding profiles with serum bactericidal activity against Neisseria meningitidis.
Main Methods:
- Analysis of human sera from a Phase II clinical trial of the 4CMenB vaccine (Bexsero) using an antigen microarray.
- Application of Partial Least Squares Regression to link IgG antibody reactivity to complement-dependent killing.
Main Results:
- Significant IgG antibody responses were detected against OMV antigens FetA, PorB, BamA, and PorA.
- The study identified OpcA, FetA, PorA, and PorB as key contributors to serum bactericidal activity.
Conclusions:
- The antigen microarray approach effectively identifies OMV antigens crucial for protective immunity against meningococcal disease.
- Specific OMPs like OpcA, FetA, PorA, and PorB play significant roles in the vaccine-induced immune response and bacterial killing.
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