4.7 Article

Expression of Interleukin 17A and 17B in Gingival Tissue in Patients with Periodontitis

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JOURNAL OF CLINICAL MEDICINE
卷 12, 期 14, 页码 -

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MDPI
DOI: 10.3390/jcm12144614

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IL-17; periodontal disease; inflammation

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The aim of this study was to investigate the expression and localization of IL-17A and IL-17B in gingival tissue of patients with periodontitis. The results showed that the mRNA expression of IL-17B was significantly lower in patients with periodontitis compared to healthy subjects, while there was no significant difference in the expression of IL-17A. Furthermore, the expression of IL-17A was significantly correlated with the approximal plaque index, and the expression of IL-17B showed a borderline statistical significance correlation with the clinical attachment level.
Periodontitis (PD) is a chronic inflammatory disease that is initiated by oral microorganisms. The pathogens induce the production of cytokines, such as interleukin (IL)-17, which enhances the inflammatory response and progression of the disease. The aim of this study was to examine the expression and localization in gingival tissue of IL-17A and IL-17B in patients with periodontitis. This study included 14 patients with periodontal disease and 14 healthy subjects without periodontal disease as a control group. There were no statistically significant differences in the expression of IL-17A mRNA between patients with periodontitis and control subjects. The expression of IL-17B mRNA was statistically significantly lower in patients with periodontitis in comparison with healthy subjects (p < 0.048). The expression of IL-17A correlated significantly with the approximal plaque index. The IL-17B expression in gingival tissue correlated with the clinical attachment level. This correlation reached borderline statistical significance (p = 0.06). In immunohistochemical analysis, we have shown the highest expression of IL-17 protein in inflamed connective tissue, epithelium, and granulation tissue from gingival biopsy specimens from patients with periodontitis. In biopsy specimens from healthy individuals, no IL-17 was found in the epithelium, while an expression of IL-17 was found in the connective tissue. The results of our study confirm the involvement of IL-17 in the pathogenesis of periodontitis. Our results suggest that an increase in IL-17 protein expression in the gingival tissue of patients with periodontitis occurs at the post-translational stage.

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