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Cellular immuno-competence of infected root canal contents in pathogenesis of periapical lesions
J Ninomiya1, K Nakanishi, T Takemoto
1Department of Endodontology and Periodontology, Hiroshima University School of Dentistry, Japan.
Abstract:
The soluble fractions of infected root canal contents (IRCC) were collected from about 300 human extracted teeth and examined for the presence of mononuclear cell (MNC) chemotaxis and cellular immunocompetence. IRCC showed remarkable chemotactic activity for polymorphonuclear leukocytes but a weak activity for MNC. However, generation of intrinsic MNC chemotaxis and induction of cellular immunity were confirmed in rats given repeated injections of IRCC.
Insights
Infected root canal contents (IRCC) attract certain immune cells but not others. However, IRCC can stimulate a broader immune response when tested in animal models, suggesting potential for immune modulation.
Area of Science:
- Immunology
- Microbiology
- Dentistry
Background:
- Infected root canal contents (IRCC) are associated with complex microbial communities.
- Understanding the immunomodulatory potential of IRCC is crucial for endodontic treatment outcomes.
Purpose of the Study:
- To investigate the chemotactic activity of IRCC on different immune cell types.
- To assess the capacity of IRCC to induce cellular immunocompetence.
Main Methods:
- Soluble fractions of IRCC from human teeth were prepared.
- Chemotaxis assays were performed using polymorphonuclear leukocytes and mononuclear cells (MNC).
- Cellular immunity was evaluated in rats following repeated IRCC injections.
Main Results:
- IRCC exhibited significant chemotactic activity for polymorphonuclear leukocytes.
- A weak chemotactic response was observed for MNC directly from IRCC.
- Repeated IRCC administration in rats induced intrinsic MNC chemotaxis and cellular immunity.
Conclusions:
- IRCC possess distinct immunomodulatory properties, attracting specific leukocytes.
- The data suggest that IRCC can prime the immune system, leading to enhanced cellular immunity.
- These findings have implications for understanding host-pathogen interactions in endodontic infections.