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CD5 is associated with the human B cell antigen receptor complex

A C Lankester1, G M van Schijndel, J L Cordell

  • 1Department of Clinical Viro-Immunology, The Netherlands Red Cross Blood Transfusion Service, Amsterdam.

European Journal of Immunology
|April 1, 1994
PubMed

Insights

CD5 associates with the B cell receptor (BCR) complex on human B cells, influencing signaling pathways. This finding reveals a unique role for CD5+ B cells in modulating BCR signals and immune responses.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The B cell receptor (BCR) complex, crucial for B cell activation, consists of membrane immunoglobulin and the Ig alpha/beta heterodimer.
  • A subset of B cells, including those in chronic lymphocytic leukemia, express CD5, a molecule also found on T cells.
  • CD5+ B cells are implicated in autoimmunity and possess distinct signaling properties compared to conventional B cells.

Purpose of the Study:

  • To investigate the association of CD5 with the BCR complex in human B cells.
  • To determine the functional role of CD5 in BCR-mediated signaling.

Main Methods:

  • Co-immunoprecipitation assays to assess CD5 association with the BCR complex.
  • Analysis of tyrosine kinase activity following BCR stimulation in CD5+ B cells.

Main Results:

  • CD5 is demonstrated to be physically associated with the BCR complex on human B cells.
  • CD5 functions as a substrate for BCR-induced tyrosine kinase activity.
  • These findings suggest CD5+ B cells possess a distinct capacity to modulate BCR signals.

Conclusions:

  • CD5 plays a direct role in BCR complex signaling, acting as a substrate for associated kinases.
  • The association of CD5 with the BCR complex provides a molecular basis for the unique signaling characteristics of CD5+ B cells.
  • This interaction offers potential therapeutic targets for conditions involving aberrant B cell signaling.

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