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T cell activation in rheumatoid synovium is B cell dependent
S Takemura1, P A Klimiuk, A Braun
1Department of Medicine and Immunology, Mayo Clinic, Rochester, MN 55905, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|October 10, 2001
Summary
In rheumatoid arthritis, B cells are crucial for activating T cells in synovial inflammation. Depleting B cells stops T cell activation, highlighting their role as a therapeutic target.
Area of Science:
- Immunology
- Rheumatology
- Cell Biology
Background:
- Rheumatoid arthritis involves T cell-driven synovial inflammation and tertiary lymphoid structures.
- The function of extranodal lymphoid neogenesis in rheumatoid arthritis is unclear.
Purpose of the Study:
- To investigate the role of CD4 T cells and B cells in rheumatoid arthritis synovial inflammation.
- To determine the significance of tertiary lymphoid structures in disease pathogenesis.
Main Methods:
- Microdissection of synovial tissue to isolate CD4 T cells from T cell/B cell follicles.
- Adoptive transfer of CD4 T cell clones into rheumatoid arthritis synovium-SCID mouse chimeras.
- B cell depletion studies using anti-CD20 mAb.
Main Results:
- CD4 T cell clones recognized the same antigen in independent follicles.
- Adoptively transferred CD4 T cells enhanced cytokine production (IFN-gamma, IL-1beta, TNF-alpha) in an HLA-DRB1-dependent manner.
- T cell activation required the presence of B cells; B cell depletion inhibited cytokine production.
Conclusions:
- B cells play a central role in T cell activation within rheumatoid arthritis synovial tissue.
- B cells are essential for maintaining T cell-mediated inflammation in this context.
- B cells represent a promising therapeutic target for rheumatoid arthritis treatment.