IL17A and autoimmune hepatitis: On the other hand, Longhi et al. have already showed that the inhibition of IL-17 can increase the immunosuppressive activity of Treg cells and thus the promotion of CD25-cells (ngTreg cells) differentiation, while Zhao et al. have shown that IL-17 acts on the expression of hepatic IL-6 which has a direct role in the cause of AIH and according to the same study there exists an opposite relationship between growth, differentiation, and function of Th17 cells and Treg cells [36].