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Related Experiment Videos

Hyperresponsive B cells in CD22-deficient mice

T L O'Keefe1, G T Williams, S L Davies

  • 1Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK.

Science (New York, N.Y.)
|November 1, 1996
PubMed
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CD22 is a negative regulator of B cell signaling. Removing CD22 in mice led to heightened immune responses and increased autoantibodies, indicating its role in controlling B cell activation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • CD22 is a B lymphocyte surface glycoprotein.
  • It undergoes rapid tyrosine phosphorylation upon antigen receptor cross-linking.
  • Its precise role in B cell signaling regulation is under investigation.

Purpose of the Study:

  • To investigate the function of CD22 in B cell receptor signaling.
  • To determine the impact of CD22 deficiency on immune responses.

Main Methods:

  • Gene disruption of CD22 in mice.
  • Analysis of splenic B cell signaling (calcium flux, proliferation).
  • Assessment of immune response, B-1 cell population, and autoantibody titers.

Main Results:

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  • Mice lacking CD22 exhibited hyperresponsive B cells.
  • Heightened calcium fluxes and cell proliferation were observed at lower ligand concentrations.
  • CD22-deficient mice showed augmented immune responses, expanded B-1 cell populations, and increased autoantibodies.

Conclusions:

  • CD22 acts as a negative regulator of B cell antigen receptor signaling.
  • Its expression in mature B cells may increase the threshold for B cell activation.
  • CD22 plays a critical role in maintaining immune tolerance and preventing autoimmunity.