The effect of SCFAs on Tregs generation has been further investigated in a mouse model of colitis; Zhang et al. showed that butyrate treatment ameliorated TNBS-induced colitis in mice and this effect was sustained by an increased number of peripheral blood CD25+ Foxp3+ Tregs, with subsequent higher levels of peripheral blood and colonic IL-10 and IL-12, and a decreased level of IL-17 and IL-23 in mesenteric lymph nodes [89]. This evidence concerns the gene IL17A and colitis.