ResearchIn-Press PreviewInflammation
Open Access | 10.1172/jci.insight.188028
1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
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4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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Bergot, A.
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1Frazer Institute, The University of Queensland, Brisbane, Australia
2Mater Research Institute, The University of Queensland, Brisbane, Australia
3College of Medicine & Public Health, Flinders University, Adelaide, Australia
4College of Medicine & Public Health, Flinders University, Australia
5College of Medicine & Public Health, Flinders Medical Centre, Adelaide, Australia
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Thomas, R.
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Published July 31, 2025 - More info
Spondyloarthritis (SpA) is an inflammatory arthritis of the spine and joints associated with intestinal inflammation, in which it is hypothesized that innate immune exposure to entero-invasive species is followed by self/bacterial peptide presentation. However, the mechanisms underlying loss of tolerance to gut bacteria in genetically at-risk individuals are unclear. Curdlan (β-1,3-glucan, dectin-1 ligand)-treated ZAP-70W163C (SKG) mice develop autoimmune arthritis and ileitis associated with Gram-negative faecal dysbiosis. Using gnotobiotic mice, we show that curdlan-treated SKG mice mono-associated with Parabacteroides goldsteinii or Lactobacillus murinus developed ileitis, arthritis and enthesitis, while BALB/c mice were tolerant. Gnotobiotic SKG ileum upregulated Il23a and ER stress genes and lost goblet cells. Whereas bacterial DNA co-localised with neutrophils and inflammatory macrophages in SKG lamina propria, peri-articular bone marrow, entheses and spleen, in BALB/c bacterial DNA co-localised with resident macrophages in lamina propria and spleen. Human psoriatic-arthritis synovial tissue also contained cell-associated peri-vascular bacterial DNA. Curdlan-treated SKG spleen/bone marrow macrophages transferred severe arthritis and expanded Th17 cells in naïve SKG recipients, while BALB/c or germ free-SKG macrophages transferred mild arthritis and regulated Th17 cells. Thus, bacterial DNA and myeloid cells in the gut and their subsequent traffic regulate or enforce T cell pathogenicity in SpA.