Correlation between Inflammasomes and Microbiota in Peri-Implantitis

Area of Science:

• Oral microbiology
• Immunology
• Periodontology

Background:

• Peri-implantitis involves inflammation around dental implants.
• Inflammasome activation is implicated in this inflammatory process.
• The relationship between specific microbiota and inflammasomes in peri-implantitis is not well understood.

Purpose of the Study:

• To investigate the correlation between oral microbiota composition and inflammasome activation in patients with peri-implantitis.
• To identify specific bacterial species associated with inflammasome components in peri-implantitis tissues.

Main Methods:

• Collected biofilm and soft tissue samples from 19 patients undergoing surgical treatment for peri-implantitis.
• Analyzed bacterial 16S rRNA gene using next-generation sequencing to determine relative abundance and diversity.
• Evaluated inflammasomes NLRP3, AIM2, caspase-1, and IL-1β in soft tissue samples via immunohistochemistry.

Main Results:

• Identified dominant bacterial species including *Porphyromonas gingivalis*, *Fusobacterium vincentii*, and *Porphyromonas endodontalis*.
• Found significant correlations between specific bacterial species and the presence of NLRP3, AIM2, caspase-1, and IL-1β in both epithelial and lamina propria tissues.
• Network analysis revealed a distinct cluster involving NLRP3, AIM2, caspase-1, IL-1β, and specific bacteria like *Prevotella* and *Tannerella forsythia*.

Conclusions:

• Inflammasomes NLRP3 and AIM2, along with their downstream effectors caspase-1 and interleukin-1β, are significantly associated with specific bacterial species in peri-implantitis.
• This suggests a direct link between microbial dysbiosis and the innate immune response in the pathogenesis of peri-implantitis.