Premium
Regulatory T cells: Mechanisms of suppression and impairment in autoimmune liver disease
Author(s) -
Liberal Rodrigo,
Grant Charlotte R.,
Longhi Maria Serena,
MieliVergani Giorgina,
Vergani Diego
Publication year - 2015
Publication title -
iubmb life
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 113
eISSN - 1521-6551
pISSN - 1521-6543
DOI - 10.1002/iub.1349
Subject(s) - autoimmune hepatitis , immunology , primary biliary cirrhosis , foxp3 , immune system , il 2 receptor , autoimmune disease , immune tolerance , regulatory t cell , autoimmunity , peripheral tolerance , liver disease , biology , antigen , t cell , hepatitis , medicine , antibody
There are three classic liver diseases with probable autoimmune etiology: primary biliary cirrhosis, primary sclerosing cholangitis, and autoimmune hepatitis. The occurrence of these autoimmune conditions is determined by the breakdown of immune‐regulatory mechanisms that in health are responsible for maintaining immunological tolerance against self‐antigens. Among the multiple T cell subsets with suppressive function, the regulatory T cells (Tregs), defined by the expression of CD4, the IL‐2 receptor α chain (CD25), and the transcription factor FOXP3, have emerged as having a central role in maintaining immune‐tolerance to autoantigens. Tregs are equipped with an array of mechanisms of suppression, including the modulation of antigen presenting cell maturation and function, the killing of target cells, the disruption of metabolic pathways, and the production of anti‐inflammatory cytokines. In all the three autoimmune liver diseases mentioned above, there is evidence pointing for either a reduced frequency and/or function of Tregs. Here, we review the definition, phenotypic characteristics, and mechanisms of suppression employed by Tregs and then we discuss the evidence available pointing to their impairment in patients with autoimmune liver disease. © 2015 IUBMB Life, 67(2):88–97, 2015