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IgM memory B cells: a mouse/human paradox.

Claude-Agnès Reynaud1, Marc Descatoire, Ismail Dogan

  • 1Faculté de Médecine, Site Necker-Enfants Malades, INSERM U783 Développement du système immunitaire, Université Paris Descartes, 156 rue de Vaugirard, Paris Cedex 15, France. claude-agnes.reynaud@inserm.fr

Cellular and Molecular Life Sciences : CMLS
|April 7, 2012
PubMed
Summary

Humoral immunity relies on memory B cells and plasma cells. This review explores long-lived IgM memory B cells in mice and their human counterparts, marginal zone B cells, highlighting key differences in function and phenotype.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Humoral immune memory is crucial for long-term protection against pathogens.
  • This memory is primarily attributed to long-lived plasma cells and memory B cells.
  • Distinct phenotypes and functions characterize these persistent cell populations.

Purpose of the Study:

  • To review evidence for long-lived IgM memory B cells in mice.
  • To discuss the potential human equivalent: marginal zone (MZ) B cells.
  • To reconcile apparent paradoxes in memory B cell populations across species.

Main Methods:

  • Review of existing literature and experimental data.
  • Comparative analysis of B cell phenotypes and functions in mice and humans.
  • Discussion of cell surface markers, including surface IgG and IgM.

Main Results:

  • Evidence suggests a long-lived IgM memory B cell population exists in mice.
  • In humans, analogous cells may be marginal zone (MZ) B cells, not classical memory B cells.
  • Human MZ B cells exhibit distinct characteristics, including recirculation and mutated B cell receptors, unlike mouse MZ B cells.

Conclusions:

  • The definition and identification of memory B cells require species-specific considerations.
  • Long-lived IgM+ B cells in mice and recirculating, mutated MZ B cells in humans represent distinct humoral memory pathways.
  • Further research is needed to fully elucidate the roles and regulation of these diverse B cell populations in adaptive immunity.