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|February 11, 2025
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B cells play a key role in rheumatoid arthritis (RA) development. Early B cell changes in individuals at risk for RA, particularly in naive B cells and CD27-negative IgG+ B cells, indicate potential contributions to disease onset.

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Area of Science:

  • Immunology
  • Rheumatology
  • Cell Biology

Background:

  • Anti-cyclic citrullinated peptide 2 (CCP2) antibody positivity is linked to rheumatoid arthritis (RA) pathogenesis.
  • B cell depletion therapies are effective in RA, highlighting the importance of B cells in the disease.
  • Understanding B cell dynamics during the transition from autoimmunity to RA is crucial for early intervention.

Purpose of the Study:

  • To investigate B cell phenotypic alterations in individuals in the risk-RA phase (CCP2-positive with musculoskeletal complaints).
  • To compare B cell phenotypes between CCP2-positive individuals at risk for RA, those who progress to RA, RA patients, and healthy controls.
  • To identify specific B cell subsets associated with RA development.

Main Methods:

  • Spectral flow cytometry was used to analyze B cell phenotypes.
  • Study included 18 CCP2-positive individuals at risk for RA, 10 CCP2-positive RA patients, and 9 healthy controls.
  • Analysis focused on B cell frequencies, including unswitched and switched memory B cells, naive B cells, and CD27-negative IgG+ B cells.

Main Results:

  • Unswitched and switched memory B cell frequencies in the risk-RA cohort were similar to controls, differing from RA patients.
  • Individuals at risk for RA who progressed to RA showed an early activation profile in naive B cells.
  • An expansion of CD27-negative IgG+ B cells was observed in RA patients compared to controls and in risk-RA progressors compared to non-progressors.

Conclusions:

  • The phenotypic distribution of B cells is altered during the risk-RA phase.
  • Changes in CD27-negative class-switched B cells, potentially linked to autoreactivity, may contribute to RA development.
  • These findings suggest that B cell alterations precede or coincide with the onset of RA in at-risk individuals.