Lowin, Torsten and Anssar, Tareq M. and Baeuml, Marina and Classen, Tim and Schneider, Matthias and Pongratz, Georg (2020) Positive and negative cooperativity of TNF and Interferon-gamma in regulating synovial fibroblast function and B cell survival in fibroblast/B cell co-cultures. SCIENTIFIC REPORTS, 10 (1). ISSN 2045-2322,
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Synovial fibroblasts (SF) were reported to produce B cell activating factor (BAFF) in response to stimulation with interferon-gamma (IFN-gamma) or tumor necrosis factor (TNF). However, the influence of these pro-inflammatory cytokines on other receptors/ligands of the TNF superfamily or associated cytokine receptors in SF has not been investigated yet. Here we show the differential regulation of BAFF (CD257), Fn14 (CD266), TACI (CD267), BAFF-R (CD268), BCMA (CD269), CD40 ligand (CD40L, CD154), IFN-gamma R (CD119), Leptin receptor (ObR, CD295), VCAM-1 (CD106) and membrane TGF-beta in isolated SF and the impact of IFN-gamma/TNF co-incubation on proliferation, IL-6 and IL-8 production. In addition, the impact of differentially stimulated SF on B cell survival in co-cultures was assessed. Surface cytokines and cytokine receptors were detected by flow cytometry. Soluble cytokine receptors and cytokines were quantified by ELISA. Proliferation was assessed by cell titer blue. Murine B cell survival in fibroblast/ B cell co-cultures was determined by annexin V/propidium iodide staining and flow cytometry. IFN-gamma together with TNF synergistically and significantly increased the cell surface levels of BAFF, Fn14, TACI, BAFF-R, BCMA, CD40L, ObR and IFN-gamma R in rheumatoid arthritis SF after 72h incubation. Soluble BAFF was only induced by IFN-gamma and inhibited by TNF. Addition of TWEAK had no influence on proliferation or IL-8 production but decreased TNF-induced IL-6 production, whereas APRIL, BAFF and leptin did not modulate TNF or TNF/IFN-gamma-induced proliferation or cytokine production. Proliferation was increased by TNF and further enhanced by the addition of IFN-gamma. In co-culture experiments, SF stimulated with TNF/IFN but not TNF or IFN-gamma alone increased shedding of VCAM-1 and expression of membrane TGF beta, which was associated with reduced survival of murine B cells. IFN-gamma and TNF regulate the expression of TNF family member cytokines and associated receptors. Ligation of IFN-gamma R and Fn14 under pro-inflammatory conditions modulated IL-6/IL-8 production and proliferation. In B cell/SF co-cultures, the combination of TNF/IFN reduced B cell survival possibly via enhanced VCAM-1 shedding and/or increased TGF-beta production. IFN-gamma is necessary for the observed effects on B cell survival and SF cytokine production and emphasizes its anti-inflammatory role in rheumatoid arthritis.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TUMOR-NECROSIS-FACTOR; SMOOTH-MUSCLE-CELLS; RHEUMATOID-ARTHRITIS; IFN-GAMMA; FACTOR-ALPHA; TGF-BETA; CD40 LIGAND; ADHESION MOLECULE-1; TRANSCRIPTIONAL REGULATION; TWEAK/FN14 INTERACTION; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Innere Medizin I Medicine > Lehrstuhl für Neurologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Apr 2021 10:31 |
| Last Modified: | 01 Apr 2021 10:31 |
| URI: | https://pred.uni-regensburg.de/id/eprint/45333 |
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