MicroRNA-21 Regulates Metabolic Adaptation of Pathogenic TH17 cells and Controls Autoimmune Inflammation
TH17 cells exhibit great heterogeneity and variable functional states in vivo. However, metabolic reprogramming of TH17 cells in vivo and its regulation during autoimmunity and host defence is unknown. Here we report that TH17 cells derived in vivo show discrete metabolic states. Metabolic states of TH17 cells in vivo were controlled at the epigenetic level, with conserved regulatory region of key metabolic regulators show distinct chromatin accessibility as demonstrated by chromatin landscape profiling. TGF-{beta}1 signaling was further shown to be crucial for remodeling of TH17 cell chromatin states, Ahr and miR-21 were identified as essential metabolic regulators for TH17 cells. Understanding metabolic reprogramming of TH17 cells in vivo may therefore provide more defined therapeutic intervention to TH17 cell mediated autoimmune diseases and insights into TH17 cell mediated host defence.