Abstract
Th17 cells are quite heterogeneous. Treating Th17-related inflammatory disorders requires understanding the functionally diverse subtypes in the context of tissue homeostasis, which is shaped by nutrient availability among other factors. Here, we show that increased consumption of fructose exacerbates colitis and experimental autoimmune encephalomyelitis (EAE), via pathogenic Th17 cells. Fructose selectively enhances the differentiation and function of this pathogenic subtype of Th17 cells, which are induced by a combination of IL1β, IL-6 and IL-23 (pTh17). In contrast, TGFβ1and IL-6-induced homeostatic, non-pathogenic Th17 cells remain unaffected. Notably, fructose enhances metabolic activity in pTh17 cells, leading to increased ROS production and subsequently promoting pathogenic-Th17 cell differentiation. N-acetyl cysteine (NAC), a ROS scavenger, specifically impaired pathogenic-Th17 cell immunity and mitigated high-fructose regulated colitis and EAE disease. Mechanistically, ROS accumulation results in elevated EGFR expression and phosphorylation, which leads to increased nuclear translocation. Nuclear EGFR binds to STAT3, enhancing its transcriptional activity at the CNS6 and CNS9 regions of Rorc. In summary, our work describes here a mechanism through which high fructose intake specifically exacerbates pathogenic Th17-cell-related pathologies and provides potential therapeutic targets for pTh17-mediated diseases.