Immunophenotyping of Patients With Rheumatoid Arthritis Reveals Difference in CD27⁺IgD⁺ Unswitched Memory B Cell...

Area of Science:

• Immunology
• Rheumatology
• Cell Biology

Background:

• Noncommunicable diseases, including rheumatoid arthritis (RA), have increased significantly.
• Current RA therapies lack preventative strategies and cures, highlighting the need for deeper understanding of disease mechanisms.
• Comprehensive immunophenotyping is crucial for elucidating RA pathophysiology.

Purpose of the Study:

• To conduct a detailed immunophenotyping analysis of patients with rheumatoid arthritis (RA).
• To identify specific immune cell profile differences between RA patients and healthy controls (HCs).
• To explore potential diagnostic or therapeutic targets based on observed immune cell disparities.

Main Methods:

• Deep immunophenotyping was performed on 52 RA patients and 47 HCs using mass cytometry.
• Whole blood samples were stained with extracellular and intracellular antibodies for 32 cell markers.
• Data analysis involved unsupervised tools, anthropometric data, and clinical-laboratory parameters.

Main Results:

• A significant difference in immune cell profiles was observed between RA patients and HCs.
• Patients with RA exhibited a notably reduced frequency of CD27+IgD+ unswitched memory B (mB) cells (p < 0.01).
• RA disease status was the primary factor explaining 17.9% of the variance in unswitched mB cell frequency.

Conclusions:

• Reduced frequency of unswitched memory B cells is a significant abnormality distinguishing RA patients from HCs.
• This immunophenotypic difference was the sole significant finding within a panel of 72 cell populations.
• These results provide valuable insights for individualizing interventions and developing novel therapeutic strategies for RA.