Abstract
Oral lichen planus (OLP) is a T cell-mediated chronic inflammatory mucosal disease, and CD4+CD25+ regulatory T cells (Tregs) are considered involved in the pathogenesis of OLP. In this study, to investigate whether there are intrinsic factors that might cause functional changes in Tregs in this disease, we evaluated the frequency of Tregs in peripheral blood and oral lesions and the expression levels of function-related transcription factors, forkhead/winged-helix transcription factor box P3 (FOXP3), transforming growth factor β (TGF-β), interleukin 10 (IL-10), and TGF-β receptors (TβRI and TβRII) mRNAs in Tregs of patients with oral lichen planus (OLP). We also investigated the frequency of pro-inflammatory cytokines (IFN-γ and IL-17A) producing Foxp3+ regulatory cells. Increased proportions of Tregs were found in OLP patients. The expression of FOXP3 on mRNA and protein level was elevated in the Tregs of OLP. The expression of TGF-β was lower both on the mRNA and serum level, whereas the expression of IL-10 showed no significant difference between the OLP patients and normal controls. The percentages of CD4+FOXP3+IL-17+ T cells were significantly higher than that of normal controls, whereas the percentages of CD4+FOXP3+IFN-γ+ T cells did not differ significantly. Furthermore, impaired suppressive function of CD4+CD25+ T cells was demonstrated in OLP patients by in vitro proliferation assay. These data indicate that Tregs in OLP are frequently expanded but functionally deficient. This could explain, at least in part, why the increased Tregs in OLP fail to control the pathogenesis and development of this autoimmune disease.
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This study was supported by research grants National Construction Project of Clinical Key Specialized Department ([2013] 544) and National Science Foundation of China (Grant No. 81170967 and Grant No. 81570975).
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Zhou, L., Cao, T., Wang, Y. et al. Frequently Increased but Functionally Impaired CD4+CD25+ Regulatory T Cells in Patients with Oral Lichen Planus. Inflammation 39, 1205–1215 (2016). https://doi.org/10.1007/s10753-016-0356-9
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DOI: https://doi.org/10.1007/s10753-016-0356-9