Oral microbiota and host inflammatory mediators

The interaction between the oral microbiota and host inflammatory mediators represents a complex biological system rather than a single molecular target. In a healthy state, the oral microbiome exists in a symbiotic relationship with the host, but a shift toward dysbiosis—characterized by the proliferation of 'red complex' pathogens like Porphyromonas gingivalis—triggers a robust host immune response (Hajishengallis, G., Nature Reviews Immunology, 2015). This response involves the activation of pattern recognition receptors, such as Toll-like receptors (TLRs), leading to the secretion of pro-inflammatory mediators including Interleukin-1 beta (IL-1β), Tumor Necrosis Factor-alpha (TNF-α), and Matrix Metalloproteinases (MMPs) (Darveau, R. P., Nature Reviews Microbiology, 2010). While these mediators are intended to control infection, their chronic overproduction leads to the degradation of the periodontal ligament and alveolar bone. Therapeutic strategies targeting this axis include the use of antiseptics and antibiotics to manage the microbial burden, alongside host-modulatory agents like sub-antimicrobial dose doxycycline (Periostat), which functions by inhibiting the activity of tissue-destructive MMPs (Preshaw, P. M., Periodontology 2000, 2004). Furthermore, the systemic dissemination of these oral inflammatory mediators is linked to the pathogenesis of non-communicable diseases such as atherosclerosis and type 2 diabetes (NIDCR, NIH, 2021).

Other names

Oral microbiome-host axisPeriodontal inflammatory responseOral dysbiosis-inflammation couplingOral-systemic inflammatory link

Reduction of pathogenic microbial load via antimicrobial action and modulation of host response through the inhibition of matrix metalloproteinases (MMPs) and pro-inflammatory cytokine production.