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Related Experiment Videos

CD40-deficient mice generated by recombination-activating gene-2-deficient blastocyst complementation

E Castigli1, F W Alt, L Davidson

  • 1Division of Immunology, Children's Hospital, Boston, MA.

Proceedings of the National Academy of Sciences of the United States of America
|December 6, 1994
PubMed
Summary

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The CD40-CD40L interaction is crucial for T-cell dependent antibody responses and B-cell isotype switching. CD40-deficient mice show impaired antibody production and germinal center formation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • CD40 is a B-cell antigen critical for immune responses.
  • Understanding CD40's role requires targeted genetic manipulation.

Purpose of the Study:

  • To investigate the function of CD40 in B-cell immune responses.
  • To determine the necessity of CD40-CD40L interactions in antibody production and isotype switching.

Main Methods:

  • Generation of CD40-deficient mouse chimeras using gene-disrupted embryonic stem cells.
  • Assessment of T- and B-cell populations and phenotypes.
  • In vitro B-cell proliferation and isotype switching assays.
  • In vivo immunization with T-cell dependent and independent antigens.

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Main Results:

  • CD40-deficient chimeras exhibited normal T- and B-cell numbers and phenotypes.
  • B cells failed to proliferate and switch isotypes in response to soluble CD40L and IL-4.
  • Complete absence of antigen-specific antibody response and germinal center formation to T-cell dependent antigens.
  • Normal response to T-cell independent antigens.
  • Reduced serum IgG1 and IgG2a, and absence of IgE in young CD40-/- animals.

Conclusions:

  • CD40-CD40L interactions are essential for T-cell dependent antibody responses.
  • CD40 signaling is critical for B-cell isotype switching.
  • CD40 plays a vital role in germinal center formation and humoral immunity.