Promotion of Inflammatory Arthritis by Interferon Regulatory Factor 5 in a Mouse Model

Arthritis & Rheumatology
Pierre DuffauIan R Rifkin

Abstract

Polymorphisms in the transcription factor interferon regulatory factor 5 (IRF5) are associated with an increased risk of developing rheumatoid arthritis (RA). This study was undertaken to determine the role of IRF5 in a mouse model of arthritis development. K/BxN serum-transfer arthritis was induced in mice deficient in IRF5, or lacking IRF5 only in myeloid cells, and arthritis severity was evaluated. K/BxN arthritis was also induced in mice deficient in TRIF, Toll-like receptor 2 (TLR2), TLR3, TLR4, and TLR7 to determine the pathways through which IRF5 might promote arthritis. In vitro studies were performed to determine the role of IRF5 in interleukin-1 (IL-1) receptor and TLR signaling. Arthritis severity was reduced in IRF5-deficient, TRIF-deficient, TLR3-deficient, and TLR7-deficient mice. The expression of multiple genes regulating neutrophil recruitment or function and bioactive IL-1β formation was reduced in the joints during active arthritis in IRF5-deficient mice. In vitro studies showed that TLR7 and the TRIF-dependent TLR3 pathway induce proinflammatory cytokine production in disease-relevant cell types in an IRF5-dependent manner. Our findings indicate that IRF5 contributes to disease pathogenesis in inflammatory a...Continue Reading

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