Inflammatory Disease Protective R381Q IL23 Receptor Polymorphism Results in Decreased Primary CD4+ and CD8+ Human T-cell Functional Responses

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2011 May 25

PMID 21606346

Citations 89

Authors

Ritu Sarin

Xingxin Wu

Clara Abraham

Affiliations

Soon will be listed here.

Abstract

The SNP (c.1142G > A;p.R381Q) in the IL-23 receptor (IL23R) confers protection from multiple inflammatory diseases, representing one of the most significant human genetic polymorphisms in autoimmunity. We, therefore, sought to define the functional consequences of this clinically significant variant. We find that CD4+CD45RO+ and CD8+ T cells from healthy R381Q IL23R carriers show decreased IL-23-dependent IL-17 and IL-22 production relative to WT IL23R individuals. This was associated with a lower percentage of circulating Th17 and Tc17 cells. Furthermore, CD8+ T cells from R381Q IL23R individuals showed decreased IL-23-dependent expansion and signal transducer and activator of transcription 3 (STAT3) activation compared with WT CD8+ T cells. Importantly, cells transfected with the IL23R glutamine variant show decreased IL-23-mediated signaling compared with the IL23R arginine allele. Our results show that the R381Q IL23R variant leads to selective, potentially desirable, loss of function alterations in primary human CD4+ and CD8+ T cells, resulting in highly significant protection against autoimmunity.

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