Soluble Fgl2 restricts autoimmune hepatitis progression via suppressing Tc17 and conventional CD8+ T cell function

The Journal of Gene Medicine
Guo AiQin Ning

Abstract

Autoimmune hepatitis (AIH) is an inflammatory disease caused by an aberrant immune response to hepatic self-antigens in which regulatory T cells (Tregs) are critical for maintaining immunosupression. The soluble form of fibrinogen-like protein 2 (sFGL2), a novel effector molecule of Treg, is rarely investigated in AIH. In the present study, we dissected the role of sFGL2 in autoimmune hepatitis and its potential mechanism underlying AIH progression. Plasma and intrahepatic sFGL2 levels, as well as Treg cells, were measured in both AIH patients and experimental autoimmune hepatitis (EAH) mice. Th1, Th2, Th17 and Treg-related cytokines were measured in the liver of EAH mice. Treg expression of sFgl2 and its effect on CD8+ T cell activity in EAH were assessed. The clinical relevance of sFGL2 in AIH-associated inflammation and fibrosis was evaluated. Th17 responses is predominant in robust AIH patients and EAH mice. In AIH patients and EAH mice, the frequency of plasma Tregs was reduced, whereas intrahepatic Tregs were increased significantly. The plasma sFGL2 level was significantly higher at active phases compared to those during remission and was correlated with AIH progression. Enhanced sFGL2 expression was found in Tregs and i...Continue Reading

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