Abstract
Th17 cells and interleukin-17 (IL-17) cytokine family members are implicated in the pathogenesis of many rheumatic diseases. Most studies in mouse models of inflammatory arthritis have demonstrated a key role for the proinflammatory cytokine IL-17A and its receptor, the IL-17 receptor (IL-17R) A/C heterodimer. The aim of this study was to use a rigorous genetic approach to evaluate the contribution of Th17 cells and IL-17 in the autoantibody-dependent KRN T cell receptor-transgenic mouse model of arthritis. We bred KRN mice expressing the major histocompatibility complex class II molecule A(g7) (referred to as K/B/g7 mice) and genetically lacking the related cytokines IL-17A and IL-17F or their critical receptor subunit, IL-17RA. Using bone marrow transplantation, we generated mice in which hematopoietic cells from K/B/g7 donor mice lacked the key Th17-differentiating transcription factor, retinoic acid receptor-related orphan nuclear receptor γt (Rorγt). K/B/g7 mice lacking both IL-17A and IL-17F produced normal titers of pathogenic autoantibodies, and arthritis developed in a typical manner. Similarly, neither IL-17RA nor Rorγt expression by hematopoietic cells was required for disease development in this model. Despite prior...Continue Reading
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