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CD4 function in thymocyte differentiation and T cell activation

N Killeen1, C B Davis, K Chu

  • 1Department of Microbiology, University of California at San Francisco 94143-0414.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|October 29, 1993
PubMed
Summary
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CD4 and CD8 glycoproteins enhance T cell receptor signaling by binding to MHC molecules. CD4

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • CD4 and CD8 glycoproteins are crucial for T cell function.
  • They interact with MHC molecules and p56lck, a protein tyrosine kinase.
  • TCR signaling stability depends on CD4/CD8 binding to MHC.

Purpose of the Study:

  • To investigate the role of CD4 in T cell development and function.
  • To elucidate the mechanism by which CD4 enhances TCR signaling.
  • To understand T cell maturation from double-positive to single-positive thymocytes.

Main Methods:

  • In vitro kinase assays.
  • In vivo studies using CD4-deficient and CD4-transgenic mice.
  • Analysis of T cell development and selection processes.

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Main Results:

  • CD4-associated lck kinase activity is not essential for CD4 function in vitro.
  • Transgenic CD4 lacking lck binding rescues helper T cell development in CD4-deficient mice.
  • T cell development involves stochastic CD4/CD8 downregulation and MHC-dependent selection.

Conclusions:

  • CD4 acts as an adhesion molecule, stabilizing TCR signaling complexes.
  • CD4 localization is regulated by interactions with p56lck.
  • T cell maturation relies on co-receptor expression and MHC recognition for selection.