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Related Experiment Videos

CD4 promotes breadth in the TCR repertoire.

Q Wang1, L Malherbe, D Zhang

  • 1Department of Microbiology and Immunology, University of California, San Francisco, CA 94143, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|October 10, 2001
PubMed
Summary

The CD4 molecule is crucial for broadening the T cell receptor repertoire. Its absence results in a T cell repertoire with reduced low-affinity antigen binding, impacting T cell signaling and expansion.

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Area of Science:

  • Immunology
  • T cell biology
  • Molecular immunology

Background:

  • CD4 is a critical co-receptor for T cell activation, primarily interacting with MHC class II molecules.
  • The T cell receptor (TCR) repertoire diversity is essential for effective immune surveillance against a wide range of antigens.
  • Understanding the role of CD4 in shaping the TCR repertoire is fundamental to immunology.

Purpose of the Study:

  • To investigate the impact of CD4 molecule absence on the selection and properties of the TCR repertoire.
  • To determine if the TCR repertoire in CD4-deficient mice differs from that in CD4-expressing mice.
  • To elucidate the role of CD4 in potentiating T cell signaling and expansion, particularly for low-affinity interactions.

Main Methods:

  • Comparative analysis of TCR repertoires in wild-type and CD4-deficient mice.

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  • Immunization studies to assess clonal expansion of T cells in response to antigens.
  • Characterization of antigen-binding properties and affinities of TCRs from CD4-deficient and CD4-expressing mice.

    • Main Results:

    • Mice lacking CD4 expression develop a distinct, yet overlapping, TCR repertoire compared to CD4-expressing mice.
    • CD4-deficient mice exhibit a reduced breadth in antigen-binding properties of their TCRs upon immunization.
    • The TCR repertoire in CD4-deficient mice is significantly depleted of TCRs with low-affinity ligand binding.

    Conclusions:

    • CD4 plays a pivotal role in broadening the TCR repertoire by enhancing T cell receptor signaling.
    • The presence of CD4 potentiates the clonal expansion of T cells that recognize low-affinity antigenic ligands.
    • These findings highlight CD4's importance in generating a diverse and effective T cell repertoire capable of responding to a wider range of antigens.