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Low-level DNA damage may suppress B cell activity in rheumatoid arthritis
According to a new study, carefully-controlled, low-level genotoxic damage may selectively suppress lymphocyte effector programs. B cells appear to be more affected than T cells in this process, potentially offering a new approach to treating rheumatoid arthritis.
Rheumatoid arthritis (RA) is marked by lymphocyte-driven inflammation, where B cells have key roles alongside T cells. During normal diversification, activated B cells introduce targeted DNA lesions that create a potential vulnerability to sublethal genotoxic stress. T cells also contribute to RA through cytokine production and cell-mediated responses, and are exposed to similar genotoxic stressors. Researchers investigated whether a single dose of sublethal genomic damage can modulate lymphocyte effector function without cytotoxicity. Peripheral blood mononuclear cells from healthy donors were co-cultured with RA fibroblast-like synoviocytes. The cells were exposed once to a low dose of gamma-irradiation, hydrogen peroxide, or oxazaphosphorine metabolite. Viability, cytokine and immunoglobulin secretion, and a 28-gene damage response were quantified at 24 hours or five days post-treatment.
Key Facts
- The study indicates that carefully-controlled, low-concentration genotoxic damage might selectively suppress lymphocyte effector programs.
- B cells appear to be more durably affected than T cells.
- At 2 Gy, overall cell viability remained above 80%.
- IL-10 expression declined by approximately 70%, indicating functional silencing.
- The findings suggest that targeting this vulnerability might help dampen B cell activity in RA.
- The approach may largely preserve overall immune viability and T cell competence.
- Researchers exposed cells to gamma-irradiation, hydrogen peroxide, and oxazaphosphorine metabolite.