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Mechanism of protection provided by active immunization with porins in mice challenged with Salmonella typhi
P Sharma1, B K Sharma, S Sharma
1Department of Experimental Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
Abstract:
Oxygen free radical (OFR) generation capacity of peritoneal macrophages was studied by chemiluminescent technique. Chemiluminescent (CL) response of macrophages from control, infected and immunized-infected mice was observed using non specific (Latex) and specific (S. typhi, cells and porins) stimulants at different time intervals. CL response was found to be significantly higher in immunized-infected group throughout the study period using all the three stimulants as compared to that in the infected as well as uninfected control mice. The mode of action of porin vaccine in increasing capacity of generating OFR is probably through increased expression of porin (protein) as well as carbohydrate receptors on the macrophage surface which leads to the stimulation of the whole caseade of respiratory burst or through the increase in the respiratory burst enzyme activities linked with each receptor or both.
Insights
Mice vaccinated with porin showed enhanced oxygen free radical (OFR) generation by macrophages. This suggests porin vaccines boost macrophage immune capacity against infection.
Area of Science:
- Immunology
- Microbiology
- Cellular Biology
Background:
- Peritoneal macrophages play a crucial role in the innate immune response.
- Oxygen free radical (OFR) generation is a key mechanism for macrophage-mediated pathogen killing.
- Understanding factors that enhance macrophage OFR generation is vital for developing effective vaccines.
Purpose of the Study:
- To investigate the effect of a porin vaccine on the oxygen free radical (OFR) generation capacity of peritoneal macrophages.
- To compare the OFR generation in macrophages from control, infected, and immunized-infected mice.
Main Methods:
- Chemiluminescent (CL) technique was employed to measure OFR generation.
- Macrophages were stimulated with non-specific (Latex) and specific (Salmonella typhi cells and porins) agents.
- CL responses were recorded at various time points post-stimulation.
Main Results:
- The immunized-infected group exhibited significantly higher CL responses compared to control and infected groups.
- This enhanced OFR generation was observed consistently across all tested stimulants and time intervals.
- The porin vaccine notably boosted the macrophage's capacity to produce OFRs.
Conclusions:
- Porin vaccination significantly enhances the oxygen free radical (OFR) generation capacity of peritoneal macrophages.
- This enhancement is likely mediated by increased expression of macrophage surface receptors (porin and carbohydrate) or augmented respiratory burst enzyme activity.
- Porin vaccines hold potential for improving macrophage-mediated immunity.