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Role of IL-17 and Th17 cells in liver diseases Hammerich L; Heymann F; Tacke FClin Dev Immunol 2011[]; 2011 (ä): 345803Unbalanced Th1/Th2 T-cell responses in the liver are a characteristic of hepatic inflammation and subsequent liver fibrosis. The recently discovered Th17 cells, a subtype of CD4(+) T-helper cells mainly producing IL-17 and IL-22, have initially been linked to host defense against infections and to autoimmunity. Their preferred differentiation upon TGFbeta and IL-6, two cytokines abundantly present in injured liver, makes a contribution of Th17 cells to hepatic inflammation very likely. Indeed, initial studies in humans revealed activated Th17 cells and Th17-related cytokines in various liver diseases. However, functional experiments in mouse models are not fully conclusive at present, and the pathogenic contribution of Th17 cells to liver inflammation might vary upon the disease etiology, for example, between infectious and autoimmune disorders. Understanding the chemokines and chemokine receptors promoting hepatic Th17 cell recruitment (possibly CCR6 or CCR4) might reveal new therapeutic targets interfering with Th17 migration or differentiation in liver disease.|*Interleukin-17/immunology/metabolism[MESH]|*Liver Diseases/immunology/metabolism/pathology[MESH]|*Liver/drug effects/immunology/metabolism/pathology[MESH]|*Th17 Cells/immunology/metabolism[MESH]|Animals[MESH]|Autoimmune Diseases[MESH]|Autoimmunity[MESH]|Cell Differentiation/immunology[MESH]|Cell Movement/immunology[MESH]|Chemical and Drug Induced Liver Injury/immunology/metabolism/pathology[MESH]|Concanavalin A/*toxicity[MESH]|Disease Models, Animal[MESH]|Humans[MESH]|Infections/immunology[MESH]|Inflammation/immunology[MESH]|Interleukin-22[MESH]|Interleukins/immunology/metabolism[MESH]|Mice[MESH]|Receptors, Chemokine/immunology/metabolism[MESH]|T-Lymphocytes, Regulatory/immunology[MESH]|Transforming Growth Factor beta/immunology/metabolism[MESH] |
