Abstract
Sphingosine 1-phosphate (S1P) signaling regulates lymphocyte egress from lymphoid organs into systemic circulation. The sphingosine phosphate receptor 1 (S1P1) agonist FTY-720 (Gilenya) arrests immune trafficking and prevents multiple sclerosis (MS) relapses. However, alternative mechanisms of S1P-S1P1 signaling have been reported. Phosphoproteomic analysis of MS brain lesions revealed S1P1 phosphorylation on S351, a residue crucial for receptor internalization. Mutant mice harboring an S1pr1 gene encoding phosphorylation-deficient receptors (S1P1(S5A)) developed severe experimental autoimmune encephalomyelitis (EAE) due to autoimmunity mediated by interleukin 17 (IL-17)–producing helper T cells (TH17 cells) in the peripheral immune and nervous system. S1P1 directly activated the Jak-STAT3 signal-transduction pathway via IL-6. Impaired S1P1 phosphorylation enhances TH17 polarization and exacerbates autoimmune neuroinflammation. These mechanisms may be pathogenic in MS.
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Acknowledgements
We thank J. Saba (Children's Hospital Oakland Research Institute) for providing THI. Supported by Neurology Department Startup Funds, Guthy-Jackson Charitable Foundation for Neuromyelitis Optica Research (M.H.H.), and US National Institutes of Health grants R37-HL67330, PO1-HL70694 and RO1HL89934 (T.H.).
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C.S.G. and M.H.H. formulated the hypothesis and designed all experiments. L.W., M.P.S. and D.K.H. contributed to the phosphoproteomic analysis. V.A.B. performed the in vitro experiment with S1P1-deficient T cells, and T.H. contributed to experiments related to S1P signaling. S.A. and D.B.L. assisted with siRNA experiments, R.A.S. with the histopathological studies, and A.A. and G.K.S. with intracellular cytokine staining and flow cytometry. R.C.A., P.P.H. and L.S. contributed to the EAE-related experiments. Y.H. and B.S.M. performed immunoblots and in vitro assays.
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Supplementary Figures 1–8 and Supplementary Tables 2 and 3 (PDF 14246 kb)
Supplementary Table 1
Dataset from phosphoproteomic analysis of MS brain lesions. (XLSX 1188 kb)
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Garris, C., Wu, L., Acharya, S. et al. Defective sphingosine 1-phosphate receptor 1 (S1P1) phosphorylation exacerbates TH17-mediated autoimmune neuroinflammation. Nat Immunol 14, 1166–1172 (2013). https://doi.org/10.1038/ni.2730
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DOI: https://doi.org/10.1038/ni.2730
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