Journal
EUROPEAN JOURNAL OF IMMUNOLOGY
Volume 48, Issue 12, Pages 1965-1974Publisher
WILEY
DOI: 10.1002/eji.201847658
Keywords
Caspase-1; NLRP3 inflammasome; NOD-like receptor; Periodontitis; Porphyromonas gingivalis
Categories
Funding
- Japan Society for the Promotion of Science [15H04730, 16H05186, 16K08772]
- contract research fund for the Program of Japan Initiative for Global Research Network on infectious Diseases (J-GRID) from the Japan Agency for Medical Research and Development (AMED)
- Grant for Joint Research Project of the Institute of Medical Science, the University of Tokyo
- Uehara Memorial Foundation
- Takeda Science Foundation
- Kato Memorial Bioscience Foundation
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Porphyromonas gingivalis is a Gram-negative anaerobic bacterium that has been considered to be one of the bacteria associated with progression of human periodontitis. Subgingival biofilms formed by bacteria, including P. gingivalis, induce chronic inflammation, and activation of inflammasome in the gingival tissue. However, the mechanisms of P. gingivalis-triggering inflammasome activation and the role of bacteria-host interactions are controversial. In this study, we investigated the potential of P. gingivalis for triggering inflammasome activation in human cells and mouse models. We demonstrated that secreted or released factors from bacteria are involved in triggering NLR family, pyrin-domain containing 3 protein (NLRP3) inflammasome in a gingipain-independent manner. Our data indicated that released active caspase-1 and mature IL-1 beta are eliminated by proteolytic activity of secreted gingipains. These results elucidate the molecular bases for the mechanisms underlying P. gingivalis-triggered inflammasome activation.
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