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T cell receptor antagonist peptides induce positive selection

K A Hogquist1, S C Jameson, W R Heath

  • 1Howard Hughes Medical Institute, Department of Immunology, University of Washington, Seattle 98195.

Cell
|January 14, 1994
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Summary

Positive selection of T cells is highly specific to peptide variants, with low-efficacy ligands mediating this crucial immune process. This study identifies specific peptide antagonists that influence T cell development.

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Area of Science:

  • Immunology
  • T cell biology
  • Molecular immunology

Background:

  • Positive selection is a critical process in T cell development within the thymus.
  • It ensures that T cells mature only if their T cell receptor (TCR) can recognize self-MHC molecules.
  • The role of specific peptide ligands in modulating positive selection remains an area of active investigation.

Purpose of the Study:

  • To investigate the role of peptide ligands in the positive selection of T cells.
  • To identify specific peptide variants that can induce positive selection in a T cell receptor (TCR) transgenic model.
  • To understand the peptide specificity and ligand density sensitivity of positive selection.

Main Methods:

  • Organ culture of fetal thymic lobes from beta 2-microglobulin deficient (beta 2M(-/-)) mice.
  • Utilizing T cell receptor (TCR) transgenic mice expressing a CD8+ T cell receptor specific for ovalbumin 257-264 in the context of Kb.
  • Analysis of thymocyte selection induced by various peptide variants, including TCR antagonist peptides.

Main Results:

  • Several peptide variants, identified as TCR antagonist peptides, were found to induce positive selection.
  • Selected thymocytes exhibited a mature CD8+ T cell phenotype and responded to antigen.
  • A specific peptide (E1) induced positive selection in beta 2M(-/-) mice but negative selection in beta 2M(+/-) mice, demonstrating exquisite peptide specificity.

Conclusions:

  • Positive selection is highly specific to the peptide ligand, even for TCR antagonist variants.
  • The process is sensitive to extremely low ligand densities.
  • Low-efficacy ligands appear to mediate positive selection, highlighting a nuanced mechanism in T cell development.