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Logo of arthrestherBioMed Centralbiomed central web sitesearchsubmit a manuscriptregisterthis articleArthritis Research & Therapy
 
Arthritis Res Ther. 2003; 5(2): 68–75.
Published online Jan 20, 2003.
PMCID: PMC165035
Systemic lupus erythematosus and the type I interferon system
Lars Rönnblomcorresponding author1 and Gunnar V Alm2
1Department of Medical Sciences, Section of Rheumatology, University Hospital, Uppsala, Sweden
2Department of Veterinary Microbiology, Biomedical Center, Uppsala, Sweden
corresponding authorCorresponding author.
Lars Rönnblom: Lars.Ronnblom/at/medsci.uu.se
Received November 19, 2002; Accepted December 20, 2002.
Abstract
Patients with systemic lupus erythematosus (SLE) have ongoing interferon-α (IFN-α) production and serum IFN-α levels are correlated with both disease activity and severity. Recent studies of patients with SLE have demonstrated the presence of endogenous IFN-α inducers in such individuals, consisting of small immune complexes (ICs) containing IgG and DNA. These ICs act specifically on natural IFN-α-producing cells (NIPCs), often termed plasmacytoid dendritic cells (PDCs). Given the fact that the NIPC/PDC has a key role in both the innate and adaptive immune response, as well as the many immunoregulatory effects of IFN-α, these observations might be important for the understanding of the etiopathogenesis of SLE. In this review we briefly describe the biology of the type I IFN system, with emphasis on inducers, producing cells (especially NIPCs/PDCs), IFN-α actions and target immune cells that might be relevant in SLE. On the basis of this information and results from studies in SLE patients, we propose a hypothesis that explains how NIPCs/PDCs become activated and have a pivotal etiopathogenic role in SLE. This hypothesis also indicates new therapeutic targets in this autoimmune disease.
Keywords: dendritic cells, interferon-α, lupus, systemic lupus erythematosus, type I interferon
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