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Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells
14:23

Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells

Published on: April 16, 2012

Expression of the immunoregulatory molecule FcRH4 defines a distinctive tissue-based population of memory B cells

Götz R A Ehrhardt1, Joyce T Hsu, Lanier Gartland

  • 1Division of Clinical and Developmental Immunology, University of Alabama at Birmingham, Birmingham, Birmingham, AL 35294, USA.

The Journal of Experimental Medicine
|September 15, 2005
PubMed

Insights

Fc receptor homologue 4 (FcRH4) marks a unique memory B cell subset. These cells are poised for immunoglobulin secretion but resist proliferation, suggesting a specialized role in immunity.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Fc receptor homologue 4 (FcRH4) is a transmembrane molecule known to inhibit B cell receptor (BCR) signaling.
  • Memory B cells are crucial for adaptive immunity, providing long-term protection against pathogens.

Purpose of the Study:

  • To characterize the FcRH4-expressing cell population within memory B cells.
  • To investigate the functional and phenotypic properties of FcRH4+ memory B cells.

Main Methods:

  • Flow cytometry to identify and quantify FcRH4+ memory B cells.
  • Analysis of immunoglobulin isotype switching and somatic hypermutation.
  • Assessment of cell surface marker expression, including CD27, CD69, CD80, CD86, CCR1, and CCR5.
  • Functional assays measuring proliferation and immunoglobulin secretion in response to various stimuli.

Main Results:

  • FcRH4 expression is restricted to a distinct subpopulation of human memory B cells, many of which are CD27-negative.
  • FcRH4+ memory B cells exhibit unique morphology, expressing activation markers (CD69, CD80, CD86) and chemokine receptors (CCR1, CCR5).
  • These cells are primed for high-level immunoglobulin secretion upon T cell cytokine stimulation but show impaired proliferation upon BCR ligation or Staphylococcus aureus stimulation.

Conclusions:

  • FcRH4 defines a unique memory B cell subset with specialized functional capabilities, including potent immunoglobulin secretion.
  • The FcRH4+ memory B cell population may play a distinct role in immune responses, potentially localized to lymphoid tissues near epithelial surfaces.
  • FcRH4 expression serves as a marker for a novel memory B cell subset with implications for understanding B cell differentiation and function.

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