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Mouse CD4 binds MHC class II with extremely low affinity

S Weber1, K Karjalainen

  • 1Basel Institute for Immunology, Switzerland.

International Immunology
|June 1, 1993
PubMed
Summary
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Researchers quantified the interaction between CD4 and MHC class II molecules using a novel rosette assay. This study reveals an extremely low binding affinity, crucial for understanding T lymphocyte development and activation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Biology

Background:

  • CD4 interaction with MHC class II is vital for CD4 T lymphocyte thymic development and activation.
  • Quantifying this molecular interaction is essential for understanding its role in immune responses.

Purpose of the Study:

  • To develop and utilize a novel assay for quantifying the CD4-MHC class II interaction.
  • To determine the binding affinity between mouse CD4 and MHC class II molecules.

Main Methods:

  • Development of a rosette assay using beads coupled with soluble mouse CD4.
  • Studying the specific binding of CD4 to MHC class II molecules expressed on A20 B lymphoma cells.

Main Results:

  • Demonstrated specific binding of CD4 to MHC class II molecules on lymphoma cells.

Related Experiment Videos

  • Revealed an extremely low binding affinity (Ka ≤ 10^4 M⁻¹) between mouse CD4 and MHC class II.

    • Conclusions:

    • The developed rosette assay is effective for studying CD4-MHC class II molecular interactions.
    • The low affinity suggests a transient or context-dependent interaction critical for T cell function.