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Protective immunity to Porphyromonas gingivalis infection in a murine model
Abstract:
The mouse abscess model has been used extensively to demonstrate protection after challenge with periodontopathic organisms. In the present study, an outer membrane (OM) preparation of P. gingivalis ATCC 33277 was used to immunize BALB/c mice prior to challenge with live P. gingivalis organisms. This OM preparation, particularly at the highest dose level of 100 micrograms/immunization, was able to induce high levels of specific antibody and subsequent protective immunity. Protection in all immunized mice was noted by the rapid healing of the primary lesions, a low incidence of secondary lesions, and, in the highest dose group, an absence of septicemia. Non-immunized animals demonstrated a slower development as well as healing of primary lesions, with higher numbers and larger sizes of secondary lesions. Weight loss and behavior patterns such as hunched bodies, ruffled hair, and stiffness of the hind legs were particularly noted in this group. Depletion of CD4 T cells in mice prior to immunization with 100 micrograms P. gingivalis OM resulted in significantly depressed serum levels of anti-P. gingivalis antibody and an increase in the physical signs of disease compared with both the immunized and control groups. Western blot analysis demonstrated three antigen bands (63.3, 50.1, and 45.1) recognized by all immunized groups and also the control non-immunized group, although the latter recognition occurred only after challenge. A further antigen band of 36.1 kDa was recognized by sera from the highest dose group only. This study has demonstrated the ability of P. gingivalis OM to provide protection against challenge with live P. gingivalis organisms. The increased physical signs of disease seen in the CD4 depleted animals compared with the control group not only illustrate the protective role of serum antibody, but also suggest a possible role for T cell mechanisms in control of the lesion locally. The ability of specific OM antigens to provide similar protective immunity remains to be ascertained.
Insights
Outer membrane preparations from P. gingivalis protect mice against infection. Immunization with these outer membranes (OM) reduced disease signs and improved healing, highlighting their potential for developing vaccines against periodontopathic organisms.
Area of Science:
- Periodontology
- Immunology
- Microbiology
Background:
- Periodontopathic organisms like P. gingivalis are linked to abscesses.
- Mouse models are crucial for studying protective immunity against these pathogens.
Purpose of the Study:
- To evaluate the protective efficacy of P. gingivalis outer membrane (OM) preparations against live P. gingivalis challenge in a mouse model.
- To investigate the role of CD4 T cells in the immune response to P. gingivalis OM immunization.
Main Methods:
- BALB/c mice were immunized with P. gingivalis ATCC 33277 OM.
- Mice were subsequently challenged with live P. gingivalis.
- CD4 T cell depletion was performed in a subset of mice.
- Serum antibody levels and clinical signs of disease were assessed.
- Western blot analysis was used to identify recognized antigens.
Main Results:
- P. gingivalis OM immunization, especially at 100 µg, induced high specific antibody levels and protective immunity.
- Immunized mice showed rapid lesion healing, fewer secondary lesions, and no septicemia.
- CD4 T cell depletion reduced antibody levels and worsened disease signs.
- Western blot identified specific OM antigens recognized by immune sera.
Conclusions:
- P. gingivalis OM can confer protection against challenge with live P. gingivalis.
- Serum antibody plays a protective role, and T cell mechanisms may be involved in local lesion control.
- Further research is needed to determine if specific OM antigens can provide similar protective immunity.