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Rheumatoid arthritis synovial fibroblasts modulate T cell activation.

Melissa R Romoff1, Preethi K Periyakoil2, Edward F DiCarlo3

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|October 7, 2025
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Summary
This summary is machine-generated.

Fibroblast-like synoviocytes (FLS) in rheumatoid arthritis (RA) suppress T cell activation via IDO1-mediated tryptophan depletion. This highlights FLS as key regulators in RA synovium, suggesting therapeutic strategies should preserve their immunosuppressive functions.

Keywords:
AutoimmunityImmunologyRheumatology

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Area of Science:

  • Immunology
  • Rheumatology
  • Cell Biology

Background:

  • Fibroblast-like synoviocytes (FLS) in rheumatoid arthritis (RA) synovium express MHC class II but lack costimulatory signals for T cell activation.
  • Professional antigen-presenting cells (APCs) like macrophages typically provide these signals for robust T cell responses.

Purpose of the Study:

  • To investigate the immunomodulatory role of FLS in RA.
  • To elucidate the mechanisms by which FLS influence T cell activation and function.
  • To explore the therapeutic implications of FLS-mediated immune regulation in RA.

Main Methods:

  • Antigen presentation assays using FLS and macrophages.
  • Flow cytometry to assess T cell activation markers (CD69, CD25, HLA-DR).
  • Measurement of T cell proliferation and cytokine production.
  • Indoleamine 2,3-dioxygenase (IDO1) activity assays.
  • Spatial transcriptomics of RA synovium.

Main Results:

  • FLS antigen presentation induced a unique T cell state with high CD69, low CD25/HLA-DR, suppressed proliferation, and reduced cytokine production compared to APCs.
  • FLS suppressed macrophage-induced T cell activation, demonstrating a dominant immunomodulatory role.
  • IDO1-mediated tryptophan depletion was identified as the primary mechanism for FLS-induced T cell hyporesponsiveness.
  • IDO1 and CD69 colocalization was observed in ectopic lymphoid structures within RA synovium.

Conclusions:

  • FLS are critical regulators of T cell responses in the RA synovium.
  • IDO1-mediated tryptophan depletion is a key mechanism for FLS-induced immunosuppression.
  • Therapeutic strategies targeting pathogenic FLS in RA should consider preserving their immunosuppressive functions.