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Open Access 01-12-2010 | Review

IL-2 as a therapeutic target for the restoration of Foxp3⁺ regulatory T cell function in organ-specific autoimmunity: implications in pathophysiology and translation to human disease

Authors: Eva d'Hennezel, Mara Kornete, Ciriaco A Piccirillo

Published in: Journal of Translational Medicine | Issue 1/2010

Abstract

Peripheral immune tolerance requires a finely controlled balance between tolerance to self-antigens and protective immunity against enteric and invading pathogens. Self-reactive T cells sometimes escape thymic clonal deletion, and can subsequently provoke autoimmune diseases such as type 1 diabetes (T1D) unless they are controlled by a network of tolerance mechanisms in the periphery, including CD4⁺ regulatory T cells (T_reg) cells. CD4⁺ Treg cells are characterized by the constitutive expression of the IL-2Rα chain (CD25) and preferentially express the forkhead winged helix transcriptional regulator Foxp3. These cells have been shown to possess immunosuppressive properties towards various immune cell subsets and their defects are thought to contribute to many autoimmune disorders. Strong evidence shows that IL-2 is one of the important stimulatory signals for the development, function and fitness of Treg cells. The non-obese diabetic (NOD) mouse model, a prototypic model of spontaneous autoimmunity, mimics many features of human T1 D. Using this model, the contribution of the IL-2-IL-2R pathway to the development of T1 D and other autoimmune disorders has been extensively studied. In the past years, strong genetic and molecular evidence has indicated an essential role for the IL-2/IL-2R pathway in autoimmune disorders. Thus, the major role of IL-2 is to maintain immune tolerance by promoting Treg cell development, functional fitness and stability. Here we first summarize the genetic and experimental evidence demonstrating a role for IL-2 in autoimmunity, mainly through the study of the NOD mouse model, and analyze the cellular and molecular mechanisms of its action on Treg cells. We then move on to describe how this data can be translated to applications for human autoimmune diseases by using IL-2 as a therapeutic agent to restore Treg cell fitness, numbers and functions.

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Title: IL-2 as a therapeutic target for the restoration of Foxp3+ regulatory T cell function in organ-specific autoimmunity: implications in pathophysiology and translation to human disease
Authors: Eva d'Hennezel
Mara Kornete
Ciriaco A Piccirillo
Publication date: 01-12-2010
Publisher: BioMed Central
Published in: Journal of Translational Medicine / Issue 1/2010
Electronic ISSN: 1479-5876
DOI: https://doi.org/10.1186/1479-5876-8-113

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