New Study Reveals How to Manipulate Dental Plaque for Better Oral Health by Targeting Bacterial Communication
Key Details
- Researchers from the College of Biological Sciences and the School of Dentistry investigated how bacterial quorum sensing (chemical signaling) affects the oral microbiome.
- The study, published in npj Biofilms and Microbiomes, focused on N-acyl homoserine lactones (AHLs) produced by bacteria in dental plaque.
- In aerobic conditions (above the gumline), removing AHL signals using lactonase enzymes increased populations of bacteria associated with good oral health.
- In anaerobic conditions (below the gumline), adding AHLs promoted growth of late-colonizing bacteria linked to periodontal disease.
Background
The human mouth hosts about 700 bacterial species, which communicate via quorum sensing.
Dental plaque develops in stages: pioneer species (e.g., Streptococcus, Actinomyces) are associated with health, while later colonizers (e.g., Porphyromonas gingivalis) are linked to disease.
Disrupting bacterial communication could reshape plaque communities to a healthier state without killing bacteria.
Statements
Mikael Elias (senior author) said that by disrupting chemical signals, one could manipulate plaque to remain in a health-associated stage.
Rakesh Sikdar (lead author) noted that oxygen availability changes the effect of AHL signaling, which has implications for treatment of periodontal diseases.
Funding
The study was funded by the National Institutes of Health.