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Differential Expression of Interferon-Alpha Protein Provides Clues to Tissue Specificity Across Type I Interferonopathies

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Abstract

Whilst upregulation of type I interferon (IFN) signaling is common across the type I interferonopathies (T1Is), central nervous system (CNS) involvement varies between these disorders, the basis of which remains unclear. We collected cerebrospinal fluid (CSF) and serum from patients with Aicardi-Goutières syndrome (AGS), STING-associated vasculopathy with onset in infancy (SAVI), presumed monogenic T1Is (pT1I), childhood systemic lupus erythematosus with neuropsychiatric features (nSLE), non-IFN-related autoinflammation (AI) and non-inflammatory hydrocephalus (as controls). We measured IFN-alpha protein using digital ELISA. Eighty-two and 63 measurements were recorded respectively in CSF and serum of 42 patients and 6 controls. In an intergroup comparison (taking one sample per individual), median CSF IFN-alpha levels were elevated in AGS, SAVI, pT1I, and nSLE compared to AI and controls, with levels highest in AGS compared to all other groups. In AGS, CSF IFN-alpha concentrations were higher than in paired serum samples. In contrast, serum IFN was consistently higher compared to CSF levels in SAVI, pT1I, and nSLE. Whilst IFN-alpha is present in the CSF and serum of all IFN-related diseases studied here, our data suggest the primary sites of IFN production in the monogenic T1I AGS and SAVI are, respectively, the CNS and the periphery. These results inform the diagnosis of, and future therapeutic approaches to, monogenic and multifactorial T1Is.

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Acknowledgments

We thank ImmunoQure AG for sharing antibodies used in the IFNα assay. The authors would like also to thank the data science platform of Imagine Institute (DrWareHouse).

Funding

Y.J.C. acknowledges the European Research Council (GA309449 and 786142-E-T1IFNs) and a state subsidy managed by the National Research Agency (France) under the ‘Investments for the Future’ programme bearing the reference ANR-10-IAHU-01. The project was supported by MSDAVENIR (Devo-Decode Project). Y.J.C. and D.D. acknowledge the Agence Nationale de la Recherche (grant CE17001002).

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Contributions

L.L., I.M., Y.J.C., and M.L.F. designed the study. L.L. and I.M. collected clinical data. V.B., L.S., G.I.R., E.C., A.L., and M.J.M.M. performed the experiments and analyzed data. I.M., B.A.A., B.B.M., M.B., T.B., C.B., O.B.T., R.C.D., I.D., C.Duc, F.D., C.Dum, P.E., A.H., V.H., M.Hi, M.Hu, E.J., R.L., F.M., S.O., S.P., M.P., P.Q., F.R., R.S., J.S., B.N., S.B., Y.J.C., and M.L.F. participated in patient evaluation and provided resources. L.L. and M.L.F. performed statistical analyses. L.L. and M.L.F. wrote the paper. L.L., I.M., V.B., A.L., B.A.A., B.B.M., R.C.D., C.Dum, P.E., F.M., J.S., B.N., S.B., D.D., Y.J.C., and M.L.F. reviewed and edited the manuscript. Y.J.C. and M.L.F. supervised the study. All authors have read the final approval of the version published.

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Correspondence to Yanick J. Crow or Marie-Louise Frémond.

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The authors declare that they have no conflict of interest.

Ethics Approval

The study was approved by the Comité de protection des personnes Ile de France II and the French advisory committee on data processing in medical research (ID-RCB: 2014-A01017-40).

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Lodi, L., Melki, I., Bondet, V. et al. Differential Expression of Interferon-Alpha Protein Provides Clues to Tissue Specificity Across Type I Interferonopathies. J Clin Immunol 41, 603–609 (2021). https://doi.org/10.1007/s10875-020-00952-x

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  • DOI: https://doi.org/10.1007/s10875-020-00952-x

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