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Related Experiment Videos

Changes in CD44 expression during B cell differentiation in the human tonsil

G Kremmidiotis1, H Zola

  • 1Department of Clinical Immunology, Flinders Medical Centre.

Cellular Immunology
|April 1, 1995
PubMed
Summary

CD44 cell surface glycoprotein expression changes during B cell differentiation, with levels varying from high on resting cells to low on activated blasts, and re-emerging on mature B cells.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD44 is a cell surface glycoprotein involved in cell adhesion and signal transduction.
  • Its role in B cell differentiation, particularly in secondary lymphoid tissues, is under investigation.
  • Changes in CD44 expression may reflect evolving cellular requirements during B cell maturation.

Purpose of the Study:

  • To investigate the expression pattern of CD44 during antigen-dependent B cell differentiation.
  • To correlate CD44 expression levels with specific B cell differentiation markers.

Main Methods:

  • Flow cytometry analysis of CD44 expression.
  • Correlation with surface immunoglobulin (IgD, IgM, IgG, IgA) and differentiation markers (CD23, CD38).

Main Results:

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  • CD44 exhibits a trimodal expression pattern during B cell differentiation.
  • High CD44 on resting IgD+/IgM+ cells; maintained at early CD23+ activation stage.
  • CD44 downregulated on CD38+ blasts (centroblasts); re-expressed on centrocytes and post-germinal center B cells (IgG+/IgA+).

Conclusions:

  • CD44 expression is dynamically regulated during B cell differentiation.
  • The observed pattern suggests CD44's involvement in B cell homing, proliferation, and survival.
  • Further studies are needed to elucidate the functional significance of CD44's dynamic expression in B cell development.