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Related Experiment Videos

CD23-mediated cell signalling

J P Kolb1, A Abadie, A Proschnicka-Chalufour

  • 1U365 INSERM, Institut Curie, Paris, France.

Journal of Lipid Mediators and Cell Signalling
|February 1, 1994
PubMed
Summary
This summary is machine-generated.

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This study reveals that CD23 (Fc epsilon RII) ligation triggers distinct signaling pathways in human B cells and monocytes. While B cells show calcium mobilization, both cell types exhibit cAMP accumulation, suggesting complex signal transduction.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Signaling

Background:

  • CD23 (Fc epsilon RII) is a low-affinity receptor for IgE, playing a role in B cell regulation and immune responses.
  • Understanding CD23-mediated signal transduction is crucial for deciphering its function in B cells and monocytes.

Purpose of the Study:

  • To investigate the signal transduction pathways activated by CD23 ligation in human B cells and monocytes.
  • To explore the potential cross-talk between CD23 and IL-4 signaling pathways.

Main Methods:

  • Analysis of phosphoinositide hydrolysis and calcium mobilization in response to CD23 ligation using monoclonal antibodies and IgE+anti-IgE complexes.
  • Measurement of cAMP accumulation following CD23 redistribution.
  • Investigation of signaling cross-talk between CD23 and IL-4.

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Main Results:

  • CD23 ligation triggered phosphoinositide hydrolysis and calcium mobilization in B cells, but not in monocytes.
  • Both B cells and monocytes showed cAMP accumulation upon CD23 redistribution.
  • Evidence suggests cross-talk between IL-4 and CD23-induced second messengers.

Conclusions:

  • CD23 ligation elicits differential signaling pathways in B cells and monocytes.
  • The observed differences may be attributed to distinct CD23 isoforms and their associated molecules.
  • CD23 signaling pathways exhibit cross-talk with IL-4-induced pathways, highlighting intricate cellular communication.