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Interactions between periodontopathogenic bacteria and cytokines
1Department of Microbiology, Eastman Dental Institute for Oral Health Care Sciences, University College London, UK.
Journal of Periodontal Research
|January 1, 1997
Summary
Porphyromonas gingivalis, a key periodontal pathogen, can degrade inflammatory cytokines like interleukin-1 beta (IL-1 beta) and IL-6. This bacterium perturbs the cytokine network by removing these signaling molecules from the local environment.
Area of Science:
- Oral Microbiology
- Immunology
- Periodontal Disease Pathogenesis
Background:
- Cytokines are crucial in periodontal diseases, but their interaction with periodontopathogenic bacteria is poorly understood.
- Pro-inflammatory cytokines like interleukin-1 beta (IL-1 beta) and IL-6 are implicated in periodontal inflammation.
Purpose of the Study:
- To investigate if IL-1 beta and IL-6 affect the growth of Actinobacillus actinomycetemcomitans and Porphyromonas gingivalis.
- To determine if these bacteria can hydrolyze IL-1 beta, IL-6, or the anti-inflammatory IL-1 receptor antagonist (IL-1ra).
Main Methods:
- Bacterial growth monitored by electrical conductivity in media with added cytokines.
- Cytokines (IL-1 beta, IL-6, IL-1ra) incubated with bacterial culture supernatants.
- Protein analysis using SDS-PAGE and Western blotting with anti-cytokine antibodies.
Main Results:
- Neither IL-1 beta nor IL-6 affected the growth of A. actinomycetemcomitans or P. gingivalis.
- P. gingivalis, but not A. actinomycetemcomitans, hydrolyzed IL-1 beta, IL-6, and IL-1ra.
- Hydrolyzed IL-1 beta lost its ability to stimulate IL-6 release from human gingival fibroblasts.
Conclusions:
- P. gingivalis possesses the ability to degrade key cytokines involved in the inflammatory response.
- This degradation mechanism allows P. gingivalis to actively modulate the local cytokine environment.
- P. gingivalis can disrupt the host's cytokine network, contributing to periodontal disease progression.