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Functional IL6R 358Ala Allele Impairs Classical IL-6 Receptor Signaling and Influences Risk of Diverse Inflammatory Diseases

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Ferreira, Ricardo C., Freitag, Daniel F., Cutler, Antony J., Howson, Joanna M. M., Rainbow, Daniel B., Smyth, Deborah J., Kaptoge, Stephen, Clarke, Pamela +10 more·2013·PLoS Genetics

Abstract

Inflammation, which is directly regulated by interleukin-6 (IL-6) signaling, is implicated in the etiology of several chronic diseases. Although a common, non-synonymous variant in the IL-6 receptor gene (IL6R Asp358Ala; rs2228145 A>C) is associated with the risk of several common diseases, with the 358Ala allele conferring protection from coronary heart disease (CHD), rheumatoid arthritis (RA), atrial fibrillation (AF), abdominal aortic aneurysm (AAA), and increased susceptibility to asthma, the variant's effect on IL-6 signaling is not known. Here we provide evidence for the association of this non-synonymous variant with the risk of type 1 diabetes (T1D) in two independent populations and confirm that rs2228145 is the major determinant of the concentration of circulating soluble IL-6R (sIL-6R) levels (34.6% increase in sIL-6R per copy of the minor allele 358Ala; rs2228145 [C]). To further investigate the molecular mechanism of this variant, we analyzed expression of IL-6R in peripheral blood mononuclear cells (PBMCs) in 128 volunteers from the Cambridge BioResource. We demonstrate that, although 358Ala increases transcription of the soluble IL6R isoform (P = 8.3×10⁻²²) and not the membrane-bound isoform, 358Ala reduces surface expression of IL-6R on CD4+ T cells and monocytes (up to 28% reduction per allele; P≤5.6×10⁻²²). Importantly, reduced expression of membrane-bound IL-6R resulted in impaired IL-6 responsiveness, as measured by decreased phosphorylation of the transcription factors STAT3 and STAT1 following stimulation with IL-6 (P≤5.2×10⁻⁷). Our findings elucidate the regulation of IL-6 signaling by IL-6R, which is causally relevant to several complex diseases, identify mechanisms for new approaches to target the IL-6/IL-6R axis, and anticipate differences in treatment response to IL-6 therapies based on this common IL6R variant.

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  • Variants in IL6R are associated with increased risk of coronary artery disease, rheumatoid arthritis, atrial fibrillation, abdominal aortic aneurysm, asthma, type 1 diabetes, and depression.

    “Variants in the IL6R gene have been found to be associated with increased risk of coronary artery disease24, rheumatoid arthritis, atrial fibrillation, and abdominal aortic aneurysm, and with increased susceptibility to asthma, type 1 diabetes, and depression36,37.”

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Authors
Ferreira, R. C., Freitag, D. F., Cutler, A. J., Howson, J. M. M., Rainbow, D. B., Smyth, D. J., Kaptoge, S., Clarke, P., Boreham, C., Coulson, R. M., Pekalski, M. L., Chen, W.-M., Onengut-Gumuscu, S., Rich, S. S., Butterworth, A. S., Malarstig, A., Danesh, J., & Todd, J. A.
Affiliations
  • University of Cambridge (GB)
  • University of Virginia (US)
Corresponding author
Todd, John A.
Venue
PLoS Genetics
Published
2013-04-04
Volume
9
Issue
4
Pages
e1003444
ISSN
  • 1553-7390 (ISSN-L)
  • 1553-7404
OpenAlex
W1991747007
Cited by
316
References
56
Citations by year
2026: 23 · 2025: 34 · 2024: 19 · 2023: 32 · 2022: 30 · 2021: 27 · 2020: 26 · 2019: 26 · 2018: 19 · 2017: 26 · 2016: 18 · 2015: 15 · 2014: 13 · 2013: 8
FWCI
9.65
Type
journal article
Language
en
Open access
Locations
  • PLoS Genetics (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
  • Juvenile Diabetes Research Foundation International (9-2011-253, U01 DK062418, 068545/Z/02)
  • Pfizer
  • GlaxoSmithKline
  • Wellcome Trust (068545/Z/02), FP7/2007–2013, 091157, 096388, G0000934, 061858, 100140, 068545, 9-2011-253, 076113, 076113/C/04/Z)
  • National Institute for Health and Care Research (NF-SI-0512-10165, FP7/2007–2013, G0000934, NF-SI-0508-10275)
  • British Heart Foundation (FS/09/050, RG/08/014, 068545/Z/02, G0000934, RG/08/014/24067)
  • Bupa Foundation
  • University of Cambridge
  • University of Leicester
  • European Commission (241447, 2007–2013, FP7 2007-2013, FP7/2007)
  • University of Bristol
  • Evelyn Trust
  • Merck Sharp and Dohme
  • Medical Research Council (FP7/20072013, MR/L003120/1, 068545/Z/02, G0000934)
  • Cambridge Institute for Medical Research, University of Cambridge (100140)
  • NIHR Cambridge Biomedical Research Centre
  • National Heart, Lung, and Blood Institute (068545/Z/02, G0000934)
  • National Human Genome Research Institute
  • National Institute of Allergy and Infectious Diseases
  • Fogarty International Center
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK062418, U01DK062418)
  • National Institute of Child Health and Human Development
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Health Sciences › Medicine › Rheumatology › Rheumatoid Arthritis Research and Therapies
Keywords
IL-6 receptor, rs2228145, soluble IL-6 receptor, IL-6 signaling, type 1 diabetes, STAT3 phosphorylation, STAT1 phosphorylation, CD4+ T cells, monocytes, peripheral blood mononuclear cells, coronary artery disease, rheumatoid arthritis, atrial fibrillation, abdominal aortic aneurysm, asthma
MeSH terms
Alleles, Diabetes Mellitus, Type 1, Humans, Inflammation, Leukocytes, Mononuclear, Mutation, Phosphorylation, Risk Factors, Signal Transduction, Amino Acid Substitution, Receptors, Interleukin-6, Protein Isoforms, Genetic Association Studies

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