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Antigen-capturing cells can masquerade as memory B cells.

Jennifer Bell1, David Gray

  • 1Institute of Cell, Animal, and Population Biology, University of Edinburgh, Ashworth Laboratories, King's Buildings, West Mains Rd, Edinburgh EH9 3JT UK.

The Journal of Experimental Medicine
|May 21, 2003
PubMed
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Researchers found that B220- cells appearing antigen-specific actually capture serum immunoglobulin via Fc receptors, not true B cell memory. This highlights the need for caution when identifying B cell memory markers.

Area of Science:

  • Immunology
  • Cell Biology
  • Flow Cytometry

Background:

  • Memory B cells are traditionally defined as switched immunoglobulin isotype-expressing cells.
  • Recent understanding includes IgM-expressing cells and B cell lineage marker-negative cells (e.g., B220-, CD19-) as potential memory subsets.
  • Distinguishing true antigen-specific memory B cells from other cell populations is crucial for understanding adaptive immunity.

Purpose of the Study:

  • To investigate the nature and origin of B220- antigen-binding cells.
  • To determine if B220- cells represent a distinct memory B cell population.
  • To clarify the reliability of antigen-specificity and surface IgG as indicators of B cell memory.

Main Methods:

  • Utilized flow cytometry to identify and analyze antigen-specific cells after immunization with fluorescent proteins (PE).

Related Experiment Videos

  • Characterized B220+ and B220- antigen-binding cell populations based on surface markers and antigen-binding capabilities.
  • Investigated antigen-capturing cells in RAG1-/- mice and various knockout mouse models, focusing on Fc receptor involvement.

    • Main Results:

    • Detected both B220+ and B220- antigen-binding cells post-immunization.
    • B220- cells displayed myeloid-like markers and bound multiple antigens, suggesting non-specific capture.
    • These B220- cells were found to capture serum immunoglobulin via Fc gamma R1 (CD64)-dependent mechanisms, mimicking antigen-specificity.
    • No evidence for a true B220- memory B cell population was found, with all such cells explained by antigen capture.

    Conclusions:

    • The B220- antigen-binding cell population does not represent a distinct memory B cell subset.
    • These cells function by capturing serum immunoglobulin through Fc receptors, leading to a false appearance of antigen-specificity.
    • Caution is advised when using antigen-specificity or surface IgG as sole indicators for identifying B cell memory populations.