IL-17C/IL-17RE Augments T Cell Function in Autoimmune Hepatitis

Autoimmune hepatitis is a worldwide health problem and significant cause of mortality. However, the disease etiology is largely unknown, which accounts for ineffective treatment and uncontrolled disease progression. In this study, we demonstrated the functional importance of the IL-17C/IL-17RE axis in Con A–induced hepatitis. Elevated IL-17C expression was detected in liver samples of both human and mouse autoimmune hepatitis. IL-17C, produced by hepatocytes, and its specific receptor IL-17RE on liver-resident T cells were both found to be required in Con A–induced liver damage. Mechanistically, IL-17C augmented the expression of IL-2 by intrahepatic CD4+ T cells to promote NK cell activation and liver damage. To our knowledge, our findings thus for the first time defined the indispensable role of IL-17C/IL-17RE in autoimmune hepatitis; this axis may serve as a novel drug target for the treatment of this disease.