CD28^- Cells Are Increased in Early Rheumatoid Arthritis and Are Linked With Cytomegalovirus Status

Area of Science:

• Immunology
• Rheumatology
• Cell Biology

Background:

• CD3+CD8+CD28- T cells, a subset of cytotoxic T lymphocytes, are implicated in autoimmune diseases.
• Elevated levels of CD3+CD8+CD28- T cells have been observed in Rheumatoid Arthritis (RA).

Purpose of the Study:

• To investigate the prevalence of CD3+CD8+CD28- T cells in early RA.
• To determine the association between CD3+CD8+CD28- T cells, disease duration, and cytomegalovirus (CMV) seropositivity in RA patients.

Main Methods:

• Prospective observational study involving 50 RA patients (25 early, 25 established) and 25 healthy controls.
• Flow cytometry analysis of peripheral blood mononuclear cells to quantify CD3+CD8+CD28- T cells.
• Assessment of clinical and serological markers, including CMV serostatus and C-reactive protein (CRP).

Main Results:

• CD3+CD8+CD28- T cells were significantly increased in RA patients compared to controls.
• The percentage of CD3+CD8+CD28- T cells correlated positively with disease duration in RA.
• Elevated CD3+CD8+CD28- T cells were observed in CMV-seropositive RA patients, particularly in the early disease stage.

Conclusions:

• Increased CD3+CD8+CD28- T cells are a feature of RA, potentially playing a role early in disease pathogenesis.
• CMV seropositivity may contribute to the expansion of CD3+CD8+CD28- T cells in RA, suggesting a potential role for CMV in RA development.