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Journal Article
Review
The interleukin-23/interleukin-17 axis in spondyloarthritis.
Current Opinion in Rheumatology 2008 July
PURPOSE OF REVIEW: To inform readers of recent advances in our understanding of the development and function of Th17 T cells and emerging data suggesting that the interleukin-23/interleukin-17 axis may be involved in the pathogenesis of spondyloarthritis.
RECENT FINDINGS: The discovery of CD4+ Th17 T cells and the interleukin-23/interleukin-17 axis has challenged existing paradigms and the role of Th1 T cells in many autoimmune diseases. The development and cytokine profile of Th17 T cells differs in mice and humans. In humans, interleukin-23 synergizes with interleukin-6 and interleukin-1 to promote Th17 development. In mice, transforming growth factor-beta and interleukin-6 are critical, whereas interleukin-23 is more important at later stages promoting interleukin-17 production. In mice, CD4+ cells producing interferon-gamma appear to be distinct from interleukin-17-producing cells, while in humans cells secreting both cytokines have been observed. Growing evidence from animal models, cytokine analyses of patient fluids, and whole-genome association studies suggest that the interleukin-23/interleukin-17 axis plays an important role in spondyloarthritis pathogenesis. Possible links between an HLA-B27-induced unfolded protein response and activation of the interleukin-23/interleukin-17 axis have been observed in animal models and may contribute to the development of the spondyloarthritis phenotype.
SUMMARY: Activation of the interleukin-23/interleukin-17 axis in spondyloarthritis has important therapeutic implications.
RECENT FINDINGS: The discovery of CD4+ Th17 T cells and the interleukin-23/interleukin-17 axis has challenged existing paradigms and the role of Th1 T cells in many autoimmune diseases. The development and cytokine profile of Th17 T cells differs in mice and humans. In humans, interleukin-23 synergizes with interleukin-6 and interleukin-1 to promote Th17 development. In mice, transforming growth factor-beta and interleukin-6 are critical, whereas interleukin-23 is more important at later stages promoting interleukin-17 production. In mice, CD4+ cells producing interferon-gamma appear to be distinct from interleukin-17-producing cells, while in humans cells secreting both cytokines have been observed. Growing evidence from animal models, cytokine analyses of patient fluids, and whole-genome association studies suggest that the interleukin-23/interleukin-17 axis plays an important role in spondyloarthritis pathogenesis. Possible links between an HLA-B27-induced unfolded protein response and activation of the interleukin-23/interleukin-17 axis have been observed in animal models and may contribute to the development of the spondyloarthritis phenotype.
SUMMARY: Activation of the interleukin-23/interleukin-17 axis in spondyloarthritis has important therapeutic implications.
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