Abstract
Objectives: To explore the effect of periodontitis on Th cell subsets in local and systemic environments.
Methods: 32 male Sprague-Dawley rats were randomly divided into periodontitis and control groups. Silk ligatures were applied to the mandibular first (M1) molars in the periodontitis group. Inflammation and alveolar bone loss around the M1 molars were analyzed by histological staining and micro-computed tomography. The mRNA expression of IFN-γ, IL-4, IL-17 and IL-10 in the gingiva were detected by qRT-PCR. The proportions of Th1, Th2, Th17 and Treg cells in the submandibular lymph nodes, peripheral blood and jaw bone marrow were tested using flow cytometry.
Results: More inflammatory cells and alveolar bone resorption was found in the periodontitis group, with upregulated mRNA expression of IFN-γ, IL-17 and IL-10. The proportion of Th1 and Th17 cells was significantly elevated in submandibular lymph nodes, and the proportion of Th1, Th2 and Th17 cells was significantly elevated in peripheral blood, while the proportion of Th1, Th17 and Treg cells was significantly elevated in jaw bone marrow in the periodontitis group.
Conclusion: This study suggests periodontitis affects the differentiation of Th cell subsets in both local and systemic environments, resulting in an increased proportion of proinflammatory cells.
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