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Immune response of the mouse to gram-negative bacterial outer membrane extracts as assessed with monoclonal
Abstract:
Neisseria meningitidis outer membrane extracts of known serotype antigens as well as isolates from a linear carriage study were used to immunize mice for subsequent production of monoclonal antibodies. As well, membrane extracts from one strain of Pseudomonas aeruginosa, serotype M, were used. The degree of specificity of the resulting monoclonal antibodies to the two genera differed markedly when tested with known serotype antigens. That is, antibody from a given clone reacting with more than one serotype specificity was a more frequent occurrence among clones resulting from the Pseudomonas fusion. Preexisting "natural" antibody to several Pseudomonas species is considered at least partially responsible for the diversity of the response to this genus. Evidence is presented for the divergence of specificity with time after immunization with Neisseria.
Insights
Monoclonal antibodies were generated against Neisseria meningitidis and Pseudomonas aeruginosa. Pseudomonas antibodies showed less specificity, potentially due to natural antibodies influencing the immune response.
Area of Science:
- Immunology
- Microbiology
- Bacteriology
Background:
- Neisseria meningitidis and Pseudomonas aeruginosa are significant human pathogens.
- Monoclonal antibodies (mAbs) are crucial tools in diagnostics and therapeutics.
- Understanding antibody specificity against bacterial antigens is vital for vaccine development.
Purpose of the Study:
- To generate and characterize monoclonal antibodies against Neisseria meningitidis and Pseudomonas aeruginosa.
- To compare the specificity profiles of mAbs raised against these two bacterial genera.
- To investigate factors influencing antibody response diversity.
Main Methods:
- Immunization of mice with outer membrane extracts of Neisseria meningitidis and Pseudomonas aeruginosa.
- Production of monoclonal antibodies via hybridoma technology.
- Serotyping of bacterial antigens and testing antibody cross-reactivity.
Main Results:
- Monoclonal antibodies against Neisseria meningitidis exhibited higher specificity compared to those against Pseudomonas aeruginosa.
- A higher frequency of cross-reactivity was observed among antibodies generated against Pseudomonas aeruginosa.
- Pre-existing natural antibodies to Pseudomonas species are hypothesized to contribute to the diverse antibody response.
Conclusions:
- The specificity of monoclonal antibodies differs significantly between Neisseria meningitidis and Pseudomonas aeruginosa immunizations.
- Factors such as pre-existing immunity can influence the breadth of antibody responses.
- Further research is needed to elucidate the mechanisms behind antibody specificity divergence.