Innate Immune Responses in Periodontal Diseases

The innate immune system constitutes the first line of defence in periodontal tissues, integrating physical barriers, cellular sentinels and soluble mediators to maintain oral health. The gingival epithelium and crevicular fluid harbour pattern recognition receptors that detect microbial molecular patterns and initiate rapid responses. Neutrophils migrate into the gingival sulcus to phagocytose bacteria, release reactive oxygen species and deploy antimicrobial peptides. Epithelial cells and resident macrophages secrete proinflammatory cytokines to recruit and activate further immune cells. In health, these mechanisms preserve tissue integrity and microbial balance. In periodontal disease, persistent biofilm‐driven inflammation leads to dysregulated innate responses, excessive cytokine release, connective tissue degradation and alveolar bone resorption. A dynamic interplay between microbial dysbiosis and host factors such as smoking, genetics and systemic conditions shapes the threshold between protective immunity and destructive inflammation. Contemporary research seeks to delineate pathways that resolve inflammation, harness antimicrobial effectors and mitigate tissue damage, thereby informing adjunctive therapies for periodontitis worldwide.

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Innate Immune Responses in Periodontal Diseases publication trend

The graph below shows the total number of articles in innate immune responses in periodontal diseases across all publications each year (not limited to Nature Index journals).

Technical terms

Innate immune response: Rapid, non‐specific defence mechanisms acting at barriers and through cellular effectors to prevent infection.

Toll-like receptors (TLRs): Cell‐surface or endosomal sensors that recognise conserved microbial molecules and trigger inflammatory signalling.

Antimicrobial peptides: Small cationic molecules produced by host cells that directly kill or inhibit microbial growth.

Defensins: A major family of antimicrobial peptides characterised by conserved cysteine motifs and broad‐spectrum activity.

Neutrophils: Circulating phagocytic leukocytes that migrate to infection sites, engulf pathogens and release antimicrobial mediators.

Gingival epithelium: Stratified epithelial layer lining the gum sulcus that forms a physical and immunological barrier against oral microbes.

References

1. The Human Salivary Antimicrobial Peptide Profile according to the Oral Microbiota in Health, Periodontitis and Smoking. Journal of Innate Immunity (2018).
2. Whole Cigarette Smoke Increased the Expression of TLRs, HBDs, and Proinflammory Cytokines by Human Gingival Epithelial Cells through Different Signaling Pathways. PLOS ONE (2012).
3. Antimicrobial peptides and nitric oxide production by neutrophils from periodontitis subjects. Brazilian Journal of Medical and Biological Research (2012).