Regulatory T cells attenuate experimental periodontitis progression in mice

Journal of Clinical Periodontology
Gustavo P GarletJoão S Silva

Abstract

The aim of this study was to identify the presence and characterize the function of regulatory T cells (Tregs) in experimental periodontitis in mice. C57Bl/6 mice infected with Actinobacillus actinomycetemcomitans, treated or not with anti-glucocorticoid-inducible tumour necrosis factor receptor (anti-GITR) to inhibit Tregs function, were analysed regarding inflammatory cell and Tregs influx, alveolar bone loss and cytokine expression/production (analysed by real-time polymerase chain reaction and ELISA) throughout experimental periodontitis. A. actinomycetemcomitans inoculation in mice resulted in periodontal disease characterized by marked alveolar bone loss and an influx of inflammatory cells. Flow cytometry evaluation of inflammatory cells demonstrated an increased number of CD4(+)CD25(+) and CD4(+)FOXp3(+) cells, characterizing the presence of Tregs in the periodontal environment in a late stage after infection. Tregs-associated cytokines interleukin-10 (IL-10), cytotoxic T lymphocyte-associated molecule 4 (CTLA-4) and transforming growth factor-beta (TGF-beta) were found to be expressed/produced in a kinetics that resembles Tregs migration. Treatment with anti-GITR, which inhibits Tregs function, showed increased alveolar...Continue Reading

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