Immune Netw.  2012 Oct;12(5):217-221. 10.4110/in.2012.12.5.217.

Rheumatoid Fibroblast-like Synoviocytes Downregulate Foxp3 Expression by Regulatory T Cells Via GITRL/GITR Interaction

Affiliations
  • 1Department of Anatomy & Cell Biology, College of Medicine, Hanyang University, Seoul 133-791, Korea. jhyoun@hanyang.ac.kr

Abstract

Fibroblast-like synoviocytes (FLS) colocalize with leukocyte infiltrates in rheumatoid synovia. Proinflammatory leukocytes are known to amplify inflammation by signaling to FLS, but crosstalk between FLS and regulatory T cells (Tregs) remains uncharacterized. To address this possibility, we cocultured FLS lines derived from arthritic mice with Tregs. FLS that expressed the ligand for glucocorticoid-induced TNF receptor family-related gene (GITR) decreased expression of Foxp3 and GITR in Tregs in a contact-dependent manner. This effect was abolished by blocking antibody to GITR. On the other hand, the Tregs caused the FLS to increase IL-6 production. These results demonstrate that inflamed FLS license Tregs to downregulate Foxp3 expression via the GITRL/GITR interaction while the Tregs induce the FLS to increase their production of IL-6. Our findings suggest that the interaction between FLS and Tregs dampens the anti-inflammatory activity of Tregs and amplifies the proinflammatory activity of FLS, thereby exacerbating inflammatory arthritis.

Keyword

Autoimmune arthritis; Regulatory T cells; Fibroblast-like synoviocytes; Foxp3

MeSH Terms

Animals
Arthritis
Hand
Inflammation
Interleukin-6
Leukocytes
Licensure
Mice
Receptors, Tumor Necrosis Factor
Synovial Fluid
T-Lymphocytes, Regulatory
Interleukin-6
Receptors, Tumor Necrosis Factor

Figure

  • Figure 1 FLS downregulate Foxp3 expression in a contact-dependent manner. Tregs were cultured with or without FLS. In some experiments, the Tregs and FLS were physically separated by transwells (designated as Tw). After 4 days of culture, cells were collected and assayed by FACS. FACS profiles gated on CD4+ cells are shown together with percentages of the indicated cell types. The data are representative of three (A, B) or two (C) independent experiments.

  • Figure 2 Involvement of GITRL-GITR in FLS-driven downregulation of Foxp3 in Tregs. (A), Two lines of FLS were assayed by RT-PCR to assess their levels of GITRL transcripts relative to β2m transcripts. (B), Tregs were cultured with or without FLS for 4 days in the presence of anti-GITR or control mAbs. The cells were harvested and assayed by FACS. FACS profiles gated on CD4+ cells are shown. Numbers indicate percentages of cells in the indicated quadrants. The data are representative of two (A) or three (B) independent experiments.

  • Figure 3 Coculture of FLS and Tregs increases IL-6 production. FLS and Tregs were cultured separately or together with anti-CD3/anti-CD28/IL-2 stimulation. After 4 days of culture, the culture supernatants were collected and assayed by ELISA. *p<0.05 and **p<0.01 by Student's t-test. The data are representative of five independent experiments.


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