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Related Experiment Videos

Explaining high alloreactivity as a quantitative consequence of affinity-driven thymocyte selection.

V Detours1, A S Perelson

  • 1Theoretical Biology and Biophysics, MS K710, Los Alamos NM 87545, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 29, 1999
PubMed
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The affinity model explains why T cells frequently react to foreign MHC molecules (alloreactivity) but rarely to foreign antigens on self MHC. This model reconciles T cell selection with high alloreactivity.

Area of Science:

  • Immunology
  • Molecular Biology
  • Computational Biology

Background:

  • T cell activation relies on interactions between T cell receptors and peptide-MHC complexes.
  • Alloreactivity, T cell activation by foreign MHC, occurs at high frequencies (over 1%), posing a puzzle compared to foreign antigen recognition (1 in 10^4-10^6).

Purpose of the Study:

  • To reconcile the high frequency of alloreactivity with the low frequency of foreign antigen recognition.
  • To investigate the role of the affinity model of T cell selection in explaining these phenomena.
  • To explore potential mechanisms, such as peptide binding and MHC conformation, in alloreactivity.

Main Methods:

  • Development and application of a quantitative model of T cell selection.
  • Analysis of T cell receptor repertoires (pre- and post-selection).

Related Experiment Videos

  • Evaluation of the impact of peptide binding and MHC conformation on alloreactivity.

    • Main Results:

    • The affinity model of T cell selection quantitatively explains the difference in frequency between alloreactivity and foreign antigen recognition.
    • Highly alloreactive T cell repertoires can be generated without assuming a germline bias towards specific MHC residues.
    • Altered peptide binding or MHC conformation by foreign MHC molecules decreases, rather than increases, alloreactivity.

    Conclusions:

    • The affinity model of T cell selection provides a unified explanation for both self-MHC restriction and high alloreactivity.
    • The findings challenge previous hypotheses regarding peptide binding and MHC conformation as primary drivers of alloreactivity.
    • This study offers a quantitative framework for understanding T cell responses to foreign MHC molecules.