BACKGROUND: Activation of the type I interferon (IFN) response program is described for several autoimmune diseases, including systemic lupus erythematosus (SLE), multiple sclerosis (MS), myositis (IIM) and rheumatoid arthritis (RA). While IFNα contributes to SLE pathology, IFNβ therapy is often beneficial in MS, implying different immunoregulatory roles for these IFNs. This study was aimed to investigate potential diversification of IFNα-and IFNβ-mediated response programs in autoimmune diseases. METHODS: Peripheral blood gene expression of 23 prototypical type I IFN response genes (IRGs) was determined in 54 healthy controls (HCs), 69 SLE (47 test, 22 validation), 149 IFNβ-treated MS (71 test, 78 validation), 160 untreated MS, 78 IIM and 76 RA patients. Patients with a type I IFN signature were selected for analysis. RESULTS: We identified IFNα- and IFNβ-specific response programs (GC-A and GC-B, respectively) in SLE and IFNβ-treated MS patients. Concordantly, the GC-A/GC-B log-ratio was positive for all SLE patients and negative for virtually all IFNβ-treated MS patients, which was confirmed in additional cohorts. Applying this information to other autoimmune diseases, IIM patients displayed positive GC-A/GC-B log-ratios, indicating predominant IFNα activity. The GC-A/GC-B log-ratio in RA was lower and approached zero in part of the patients, implying relative importance of both clusters. Remarkably, GC-A/GC-B log-ratios appeared most heterogeneous in untreated MS; half of the patients displayed GC-A dominance, whereas others showed GC-B dominance or log-ratios near zero. CONCLUSIONS: Our findings show diversification of the type I IFN response in autoimmune diseases, suggesting different pathogenic roles of the type I IFNs.

Department of Molecular Cell Biology and Immunology VU University Medical Center Amsterdam The Netherlands

Department of Neurology Innsbruck Medical University Innsbruck Austria

Department of Neurology VU University Medical Center Amsterdam The Netherlands

Department of Pathology VU University Medical Center Amsterdam The Netherlands

Department of Rheumatology Amsterdam Rheumatology and Immunology Center Reade Amsterdam The Netherlands

Department of Rheumatology Amsterdam Rheumatology and Immunology Center VUmc Amsterdam The Netherlands

Institute of Rheumatology Prague Czech Republic

Rheumatology Unit Department of Medicine Karolinska University Hospital Solna Karolinska Institutet Stockholm Sweden

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