Abstract
Objective
Patients with systemic juvenile idiopathic arthritis (JIA) have arthritis, quotidian fevers, and other extraarticular features. This disease often remains severe and debilitating. The purpose of this study was to compare gene expression profiles in peripheral blood mononuclear cells (PBMCs) from patients with active and inactive systemic JIA to define and better understand the cause of active disease.
Methods
Gene expression profiles of PBMCs were determined in cells from 9 patients with active systemic JIA and 8 patients with inactive systemic JIA. Unsupervised clustering and significance analysis were performed. We compared the systemic JIA profile with data from patients with polyarticular JIA, chronic infantile neurologic, cutaneous, articular syndrome, Kawasaki disease, and systemic lupus erythematosus to identify diseaseโspecific genes. Quantitative reverse transcriptionโpolymerase chain reaction of selected genes was performed on negatively selected B cells, T cells, and monocytes.
Results
Unsupervised clustering of expressed genes resulted in 2 groups that corresponded to the clinical status of the patients (active and inactive disease) and was independent of their medications. A total of 286 genes were identified as significantly upโregulated in patients with active disease and 86% of them were specific to systemic JIA. Interleukinโ6 (ILโ6) was expressed in monocytes and B cells, ILโ10 in monocytes, and suppressor of cytokine signaling 3 in monocytes and T cells from patients with active disease.
Conclusion
Gene expression profiles in PBMCs identified diseaseโspecific genes in patients with systemic JIA. Cell type analyses should allow further insight into the mechanisms of the disease.