IL-17 Mediated Immunopathology in Periodontal Disease

Periodontal disease arises from a complex interplay between host immunity and oral microbiota. Central to its pathogenesis is the cytokine interleukin-17 (IL-17), principally secreted by T helper 17 (Th17) cells. IL-17 orchestrates neutrophil recruitment, enhances local production of proinflammatory mediators such as tumour necrosis factor and interleukin-6, and upregulates RANKL, promoting osteoclast differentiation and alveolar bone loss. While acute IL-17 responses contribute to microbial clearance, chronic dysregulation leads to sustained inflammation, connective tissue destruction and systemic complications. Recent insights have revealed that mechanical cues from mastication and signals from the dysbiotic subgingival microbiome further amplify IL-17 production, reinforcing a cycle of tissue damage. Moreover, evidence of cellular plasticity within the Th17 pool, including transition towards T follicular helper-like phenotypes, suggests endogenous regulatory mechanisms that may limit pathology or offer novel therapeutic targets. Understanding how IL-17 integrates microbial, mechanical and immunological signals is vital for developing interventions to arrest disease progression and restore periodontal health.

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IL-17 Mediated Immunopathology in Periodontal Disease publication trend

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Technical terms

Interleukin-17 (IL-17): A proinflammatory cytokine produced primarily by Th17 cells that promotes neutrophil recruitment and bone resorption.

T helper 17 (Th17) cells: A subset of CD4+ T cells defined by expression of RORγt and secretion of IL-17A, involved in mucosal defence and inflammation.

RANKL: Receptor activator of nuclear factor kappa-B ligand, a protein that drives osteoclast maturation and alveolar bone loss.

T follicular helper (Tfh) cells: A CD4+ T cell subset that supports B cell maturation and antibody production within lymphoid follicles.

Dysbiosis: An imbalance in the composition of the microbial community that can trigger or exacerbate inflammatory responses.

References

1. Th17-to-Tfh plasticity during periodontitis limits disease pathology. Journal of Experimental Medicine (2024).
2. Cytokines in gingivitis and periodontitis: from pathogenesis to therapeutic targets. Frontiers in Immunology (2024).
3. Th17 Cells and the IL-23/IL-17 Axis in the Pathogenesis of Periodontitis and Immune-Mediated Inflammatory Diseases. International Journal of Molecular Sciences (2019).
4. On-going Mechanical Damage from Mastication Drives Homeostatic Th17 Cell Responses at the Oral Barrier. Immunity (2017).