Type I Interferon in Rheumatoid Arthritis, Systemic Lupus Erythematosus, Myositis and Systemic Scleroderma – A Review of Transcript Profiling Studies in the Blood
Abstract
Rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), myositis and systemic sclerosis (SSc) are complex rheumatic diseases with heterogeneous clinical features. Though the are not completely understood for these diseases, recent work has revealed type I interferon (IFN) as a shared pathway that is overexpressed in patient subgroups of each disease. This commonality of an activated type I IFN pathway is robust and consistently present in both affected tissue and peripheral blood of patients with these diseases. Transcript profiling technology has greatly enabled such discoveries, allowing one to survey the dysregulation of numerous biological pathways simultaneously and identify those most associated with both disease severity and activity, increasing understanding of the underlying mechanisms at play. In this review, we examine how transcript profiling is used to characterise the activation of the type I IFN pathway in the diseases of RA, SLE, myositis and SSc, as measured in the blood, and report how this activation pattern associates with measures of disease pathogenesis, activity and/or treatment response.Acknowledgements: We would like to acknowledge Jonathan Hirsch, Chris Morehouse and Philip Brohawn for their contributions to this work.
Type I interferon (IFN), systemic lupus erythematosus (SLE), myositis, rheumatoid arthritis (RA), systemic sclerosis (SSc), type I IFN-inducible genes
Type I Interferons
The type I interferon (IFN) family consists of multiple members including 14 IFN-α subtypes, −β, −ε, −κ, −ω, −δ and -τ. They bear a variety of biological functions, such as defending against viral or bacterial infection, immunomodulation and anti-proliferation. Due to their pluripotent function, type I IFNs, more specifically IFN-α/β, have been intensively studied for decades for their important roles in immunity/autoimmunity and cancers. Although IFN-α/β can be produced by many types of cells when exposed to environmental threats such as viral or bacterial infections, the most potent source of IFN-α/β is plasmacytoid dendritic cells (PDCs), which produce more than 1,000-fold more IFN-α/β than any other cell type.1–3
IFN-α/β composition, receptors and pathways have been thoroughly reviewed;4–6 therefore, we only provide a brief description here. The type I IFN receptor (IFNAR), a heterodimer of IFNAR-1 and IFNAR-2, is activated by the binding of IFN-α or –β, resulting in the conformational changes of IFNAR and activation of the Janus kinase (JAK)/signal transducers and activators of transcription (STAT) signalling pathway (see Figure 1). JAK1 and tyrosine kinase2 (TYK2) are intracellular kinases associated with type I IFN receptors that recruit and phosphorylate STAT1 and STAT2, which form IFN-stimulated gene factor (ISGF3), a heterotrimeric transcription complex with IFN regulatory factor 9 (IRF-9). This complex (ISGF3) then binds to an upstream regulatory sequence, IFN-stimulated response element (ISRE), to initiate transcription of IFN-inducible genes. This pathway is a classic type I IFN signalling pathway that is active in almost all cell types (see Figure 1A). Other than STAT1 and STAT2, there are other STATs that have been found to be activated by type I IFN, and such activation is generally cell type-specific7–10 Accumulating evidence indicates that there are other signalling pathways necessary for diverse responses to type I IFN. These pathways are independent of the classic JAK/STAT pathway (see Figure 1B and 1C) or somehow co-operate with the JAK/STAT pathway to adjust in association with type I IFN. In response to type I IFN activation, the phosphoinositide-3 kinase (PI3K) pathway can activate AKT (see Figure 1B), which in turn activates nuclear factor-kappa B (NF-κB). Alternatively, PI3K/AKT can activate NF-κB through protein kinase Cθ (PKCθ), which can also be activated by VAV, a component of the p38 mitogen-activated protein kinase (MAPK) pathway in response to type I IFN activation.
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