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A Crohn’s Disease-associated IL2RA Enhancer Variant Determines the Balance of T Cell Immunity by Regulating Responsiveness to IL-2 Signalling

Goldberg, R; Clough, JN; Roberts, LB; Sanchez, J; Kordasti, S; Petrov, N; Hertweck, A; ... Lord, GM; + view all (2021) A Crohn’s Disease-associated IL2RA Enhancer Variant Determines the Balance of T Cell Immunity by Regulating Responsiveness to IL-2 Signalling. Journal of Crohn's and Colitis , 15 (12) pp. 2054-2065. 10.1093/ecco-jcc/jjab103. Green open access

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Abstract

BACKGROUND AND AIMS: Differential responsiveness to interleukin (IL)-2 between effector CD4¬+ T cells (Teff) and regulatory T cells (Treg) is a fundamental mechanism of immunoregulation. The single nucleotide polymorphism rs61839660, located within IL2RA (CD25), has been associated with the development of Crohn's disease. We sought to identify the T cell immune phenotype of IBD patients who carry this SNP. METHODS: Teff and Treg were isolated from individuals homozygous (TT), heterozygous (CT) or wild type (CC) for the minor allele at rs61839660, and used for phenotyping (flow cytometry, Cytometry Time Of Flight) functional assays or T cell receptor (TCR) sequencing. Phosphorylation of signal transducer and activator of transcription 5 (STAT5) was assessed in response to IL-2, IL-7 and in the presence of basiliximab, a monoclonal antibody directed against CD25. Teff proinflammatory cytokine expression levels were assessed by reverse transcription quantitative polymerase chain reaction after IL-2 and/or TCR stimulation. RESULTS: Presence of the minor T allele enhances CD25 expression leading to increased STAT5 phosphorylation and proinflammatory cytokine transcript expression by Teff in response to IL-2 stimulation in vitro. Teff from TT individuals demonstrate a more activated gut homing phenotype. TCR sequencing analysis suggests that TT patients may have a reduced clonal capacity to mount an optimal regulatory T cell response. CONCLUSIONS: rs61839660 regulates the responsiveness of T cells to IL-2 signaling by modulating CD25 expression. As low dose IL-2 is being trialed as a selective Treg modulator in CD, these findings highlight the potential for adverse effects in patients with this genotype.

Type: Article
Title: A Crohn’s Disease-associated IL2RA Enhancer Variant Determines the Balance of T Cell Immunity by Regulating Responsiveness to IL-2 Signalling
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/ecco-jcc/jjab103
Publisher version: http://dx.doi.org/10.1093/ecco-jcc/jjab103
Language: English
Additional information: © The Author(s) 2021. Published by Oxford University Press on behalf of European Crohn’s and Colitis Organisation. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Cancer Bio
URI: https://discovery.ucl.ac.uk/id/eprint/10130298
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