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J Autoimmun. 2021 May;119:102619. doi: 10.1016/j.jaut.2021.102619. Epub 2021 Feb 27.

Regulatory T cells in autoimmune hepatitis: an updated overview.

Journal of autoimmunity

Maria Serena Longhi, Giorgina Mieli-Vergani, Diego Vergani

Affiliations

  1. Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Boston, MA, 02215, USA. Electronic address: [email protected].
  2. Institute of Liver Studies, MowatLabs, Department of Inflammation Biology, School of Immunology & Microbial Sciences, Faculty of Liver Sciences and Medicine, King's College London, London, United Kingdom. Electronic address: [email protected].
  3. Institute of Liver Studies, MowatLabs, Department of Inflammation Biology, School of Immunology & Microbial Sciences, Faculty of Liver Sciences and Medicine, King's College London, London, United Kingdom. Electronic address: [email protected].

PMID: 33652348 PMCID: PMC8044040 DOI: 10.1016/j.jaut.2021.102619

Abstract

Regulatory T-cells (Tregs) are key players in the maintenance of immune homeostasis by preventing immune responses to self-antigens. Defects in Treg frequency and/or function result in overwhelming CD4 and CD8 T cell immune responses participating in the autoimmune attack. Perpetuation of autoimmune damage is also favored by Treg predisposition to acquire effector cell features upon exposure to a proinflammatory challenge. Treg impairment plays a permissive role in the initiation and perpetuation of autoimmune liver diseases, namely autoimmune hepatitis, primary biliary cholangitis and primary sclerosing cholangitis. In this Review, we outline studies reporting the role of Treg impairment in the pathogenesis of these conditions and discuss methods to restore Treg number and function either by generation/expansion in the test tube or through in vivo expansion upon administration of low dose IL-2. Challenges and caveats of these potential therapeutic strategies are also reviewed and discussed.

Copyright © 2021 Elsevier Ltd. All rights reserved.

Keywords: Autoimmune hepatitis; Effector lymphocytes; Immune tolerance; Immunotherapy; Regulatory T cells

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