Abstract
Interleukin-7 receptor alpha (IL7RA) is among the top listed candidate genes influencing the risk to develop multiple sclerosis (MS), an inflammatory demyelinating disease of the central nervous system. Soluble IL-7RA (sIL-7RA) protein and mRNA levels vary among the four common IL7RA haplotypes. Here we show and confirm that protective haplotype carriers have three times lower sIL-7RA serum levels than the other three haplotypes. High sIL-7RA concentrations significantly decrease IL-7-mediated STAT5 phosphorylation in CD4+ T cells. Transcriptome analysis of unstimulated and stimulated CD4+ T cells of MS patients carrying the different IL7RA haplotypes revealed complex and overlapping patterns in genes participating in cytokine signaling networks, apoptosis, cell cycle progression and cell differentiation. Our findings indicate that genetic variants of IL7RA result in haplotype-associated differential responsiveness to immunological stimuli that influence MS susceptibility not exclusively by varying levels of sIL-7RA.
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Acknowledgements
We thank Dr T Eiermann and Dr T Binder, Department of Transfusion Medicine, University Medical Centre Hamburg-Eppendorf, for generous supply of HD DNA samples and Brenda Reinhart, PhD, Neuroimmunology and MS Research, and Michal Okoniewski, PhD, Neuroimmunology and MS Research and Functional Genomics Center Zurich for helpful comments and carefully reading the manuscript. Funding The Institute for Neuroimmunology and Clinical Multiple Sclerosis Research (inims) was supported by a 5-year grant of the Gemeinnützige Hertie Stiftung; this project was supported by the Deutsche Forschungsgemeinschaft (MA 965/9-1). The Section of Neuroimmunology and MS Research was supported by the Clinical Research Priority Program MS (CRPPMS) of the University Zurich.
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R. Martin is coinventor on a patent for the combined use of recombinant IL-7 and vaccination with JC polyoma virus capsid protein VP1 to treat progressive multifocal leukoencephalopathy. The remaining authors declare no conflict of interest.
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Jäger, J., Schulze, C., Rösner, S. et al. IL7RA haplotype-associated alterations in cellular immune function and gene expression patterns in multiple sclerosis. Genes Immun 14, 453–461 (2013). https://doi.org/10.1038/gene.2013.40
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DOI: https://doi.org/10.1038/gene.2013.40
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