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Related Experiment Videos

The human marginal zone B cell.

Mariella Dono1, Simona Zupo, Monica Colombo

  • 1Oncologia Medica C, Istituto Nazionale per la Ricerca sul Cancro, IST, Genova, Italy. mariella.dono@istge.it

Annals of the New York Academy of Sciences
|May 3, 2003
PubMed
Summary
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Human marginal zone (MZ) B cells and follicular mantle (FM) B cells show distinct features. Human MZ B cells share similarities with murine MZ and B1 cells, suggesting a re-evaluation of human B cell classification.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Human B cell populations, specifically marginal zone (MZ) and follicular mantle (FM) B cells, exhibit unique characteristics.
  • Current B cell classification may require refinement based on human immunological data.

Purpose of the Study:

  • To characterize human tonsil and spleen MZ B cells and compare them with FM B cells.
  • To investigate the phenotype, antigen response, and T cell antigen presentation of these B cell subsets.
  • To compare human MZ and FM B cell properties with those of murine counterparts.

Main Methods:

  • Phenotypic analysis of human MZ and FM B cells from tonsils and spleens.
  • Assessment of B cell response to T cell-independent antigens and polyclonal activators.
  • Evaluation of antigen presentation to T cells.

Related Experiment Videos

  • Fractionation of MZ B cells based on IgD expression.

    • Main Results:

    • Significant differences were observed in phenotype, antigen response, and T cell antigen presentation between human MZ and FM B cells.
    • FM B cells expressed CD5, aligning them with B1 cells by current nomenclature.
    • Human MZ B cells showed analogies with both murine MZ and B1 cells.
    • Two subsets of MZ B cells were identified, differing in Ig V(H) gene mutations and TI-2 antigen response, with IgD-positive cells responding to TI-2 antigens.
    • Human CD5-positive FM B cells (termed B1 cells) displayed considerable differences compared to murine B1 cells.

    Conclusions:

    • Human MZ B cells possess features analogous to both murine MZ and B1 cells.
    • Human CD5-positive FM B cells differ significantly from murine B1 cells, necessitating further investigation.
    • The classification of human B cells may need revision, potentially designating only CD5-positive cells as B1 cells.