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Isolation, Characterization and Functional Examination of the Gingival Immune Cell Network
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CD69 Regulates Gingival Inflammation and Microbiome in Periodontitis
F M Saavedra1,2,3, L Fischer1, P D Bittner-Eddy1
1Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, MN, USA.
Journal of Dental Research
|November 27, 2025
Summary
The absence of CD69 receptors on memory CD4+ T cells exacerbates periodontitis by increasing inflammation and altering the oral microbiome. CD69 deficiency leads to greater bone loss and a more pronounced inflammatory response in experimental periodontitis.
Area of Science:
- Immunology
- Microbiology
- Oral Biology
Background:
- Periodontitis is initiated by dysbiotic subgingival biofilms and characterized by immune-mediated destruction of periodontal tissues.
- Interstitial CD4+ T cells are key regulators of periodontal inflammation, with their activation influenced by CD69 receptor expression.
- CD69 is known to modulate T cell migration, phenotype, and function during inflammatory processes.
Purpose of the Study:
- To investigate the role of CD69 in regulating CD4+ T cell responses in the context of experimental periodontitis.
- To determine how CD69 deficiency impacts T cell phenotype, periodontal inflammation, and alveolar bone loss.
- To explore the influence of CD69 on the subgingival microbiota composition during periodontitis.
Main Methods:
- Utilized CD69 knockout (CD69KO) and wild-type (WT) mouse models.
- Induced experimental periodontitis using ligature placement.
- Analyzed CD4+ T cell phenotype and cytokine production (IL-17A, IFN-γ) via in vitro activation and flow cytometry.
- Assessed alveolar bone loss and inflammatory cell infiltrate histologically.
- Characterized subgingival microbiota using 16S rRNA gene sequencing.
Main Results:
- CD69-deficient memory CD4+ T cells exhibited an enhanced proinflammatory phenotype, producing higher levels of IL-17A and IFN-γ upon activation.
- CD69KO mice displayed significantly augmented alveolar bone loss and increased inflammatory cell infiltration during experimental periodontitis.
- Gingival CD4+ T cells from CD69-deficient mice produced higher levels of IL-17A compared to WT controls.
- Absence of CD69 significantly altered the composition of the periodontitis-associated subgingival microbiota.
Conclusions:
- CD69 plays a critical regulatory role in controlling CD4+ T cell proinflammatory responses in periodontitis.
- CD69 deficiency exacerbates experimental periodontitis, leading to increased tissue destruction and inflammation.
- The lack of CD69 influences both the host immune response and the microbial environment in periodontitis.
