IL-33 changes CD25hiTregs to Th17 cells through a dendritic cell-mediated pathway.

IL-33 changes CD25hiTregs to Th17 cells through a dendritic cell-mediated pathway. Immunol Lett. 2019 Dec 18;: Authors: Park SH, Jung HJ, Kim TS Abstract Interleukin (IL)-33 is an alarmin factor that is highly secreted in a variety of autoimmune diseases, induces maturation of dendritic cells (DCs) and differentiation of T helper 17 (Th17) cells. As the balance between Th17 cells and regulatory T cells (Tregs) is important to maintain immune homeostasis, in this study, we investigated the effects of IL-33 on Treg cell response. We observed that direct treatment with IL-33 had no effect on Treg differentiation, whereas IL-33-matured DCs (IL33-matDCs) inhibited the differentiation of CD4+ T cells to Tregs by decreasing the expression of Foxp3. Furthermore, co-culture with IL-33-matDCs changed stable Tregs (CD25hiCD4+ Tregs) to IL-17-producing cells, whereas IL-33-matDCs had little effects on unstable Tregs (CD25loCD4+ Tregs). The stable Tregs were demonstrated to express high levels of IL-6 receptors. Blocking of IL-6 secreted from IL-33-matDCs suppressed the conversion of Tregs to Th17 cells, indicating the greater propensity to convert stable Tregs to Th17 cells is due to IL-6 signaling. Taken together, these results demonstrate that IL-33 inhibits Treg differentiation and the conversion of stable Tregs to Th17 cells via DCs. PMID: 31863784 [PubMed - as supplied by publisher]
Source: Immunology Letters - Category: Allergy & Immunology Authors: Tags: Immunol Lett Source Type: research