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The inflammatory milieu in the rheumatic joint reduces regulatory T-cell function
Jessica Herrath1, Malin Müller, Petra Amoudruz
1Department of Medicine, Karolinska University Hospital Solna, Karolinska Institute, Stockholm, Sweden.
European Journal of Immunology
|May 25, 2011
Summary
Regulatory T cells (Tregs) in rheumatic joints show suppressive capacity, contrary to general impairment. The joint
Area of Science:
- Immunology
- Rheumatology
- Cell Biology
Background:
- Regulatory T cells (Tregs) are crucial for immune homeostasis.
- Tregs are often considered functionally impaired in autoimmune and chronic inflammatory diseases.
- Effector T cell sensitivity to Treg suppression can vary.
Purpose of the Study:
- To investigate the functional interplay between effector T cells and Tregs within the rheumatic joint.
- To determine factors influencing Treg function in the context of joint inflammation.
- To assess whether joint-derived Tregs exhibit a general functional deficit.
Main Methods:
- Analysis of FOXP3 demethylation and cytokine production (IL-17, IFN-γ) in synovial Tregs.
- Co-culture experiments with effector T cells and Tregs, including blockade of IL-6 and TNF.
- Assessment of Treg proliferation using Ki67 staining in synovial fluid.
- Correlation of Treg function with the inflammatory milieu, including effector T cell proliferation and cytokine levels.
Main Results:
- Synovial Tregs exhibited markers of suppressive capacity, including high FOXP3 demethylation and low cytokine production.
- Treg frequency (FOXP3 expression) did not correlate with suppression levels.
- The inflammatory environment, particularly effector T cell proliferation and pro-inflammatory cytokines, significantly influenced Treg function.
- Blocking IL-6 or TNF enhanced Treg-mediated suppression in co-cultures.
- A subset of synovial Tregs (approx. 30%) were actively dividing (Ki67+), suggesting antigen encounter and expansion for immune regulation.
Conclusions:
- Joint-derived Tregs are not generally functionally deficient; they possess inherent suppressive capabilities.
- The inflammatory milieu within the rheumatic joint critically modulates Treg function and efficacy.
- Targeting inflammatory cytokines like IL-6 and TNF may enhance Treg-mediated immune regulation in joint inflammation.
- Expanding and functional Tregs actively participate in attempting to control joint inflammation.
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