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CD4/immunoglobulin interaction: implications for immune physiology and autoimmunity

P Lenert1, M Zanetti

  • 1Department of Medicine, University of California, San Diego 92103.

International Reviews of Immunology
|January 1, 1991
PubMed

Insights

CD4 molecules bind immunoglobulins, a novel interaction independent of their T cell activation role. This CD4-immunoglobulin binding may influence T-B cell cooperation in immune responses.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Biology

Background:

  • CD4 is crucial for T cell activation via binding to MHC class II molecules.
  • The interaction of CD4 with immunoglobulins (Ig) has not been previously established.

Purpose of the Study:

  • To investigate the potential interaction between CD4 and immunoglobulins.
  • To identify the region of CD4 responsible for Ig binding.
  • To explore the functional implications of CD4-Ig interaction in immune responses.

Main Methods:

  • Immunochemical studies using synthetic peptides of CD4.
  • In vitro assays to assess the enhancement of antigen-antibody interactions by CD4 peptides.

Main Results:

  • CD4 interacts with immunoglobulins through residues 21-49 in its V1 domain.
  • This Ig-binding property is independent of CD4's three-dimensional structure.
  • CD4 peptides enhance idiotype/anti-idiotype and antigen-antibody interactions, particularly in antigen excess.

Conclusions:

  • CD4 possesses a previously unrecognized ability to bind immunoglobulins.
  • This CD4-Ig interaction, mediated by specific peptide regions, may play a role in T-B cell cooperation.
  • Further research is warranted to elucidate the precise mechanisms and significance in immune regulation.

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