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Related Experiment Videos

T-cell activation: A queuing theory analysis at low agonist density.

J R Wedagedera1, N J Burroughs

  • 1Department of Mathematics, University of Ruhuna, Matara, Sri Lanka.

Biophysical Journal
|June 13, 2006
PubMed
Summary

T-cell receptor (TCR) activation uses queuing theory to model signaling thresholds. Signal integration over hours enhances specificity and sensitivity, enabling T cells to detect low ligand density and distinguish agonist quality.

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Regulatory T cell adjustment of quorum growth thresholds and the control of local immune responses.

Journal of theoretical biology·2006

Area of Science:

  • Immunology
  • Theoretical Biology
  • Biophysics

Background:

  • T-cell receptor (TCR) signaling is crucial for adaptive immunity.
  • Understanding TCR activation thresholds and their impact on T-cell function is essential.
  • Queuing theory offers a framework to model dynamic biological processes like TCR signaling.

Purpose of the Study:

  • To develop and analyze a linear triggering model for TCR activation using queuing theory.
  • To evaluate the specificity and sensitivity of different TCR activation criteria.
  • To investigate the robustness of these criteria under parameter variations and the role of signal integration.

Main Methods:

  • Development of a simple linear triggering model for TCRs based on queuing theory.
  • Fitting the model to four experimental activation criteria: calcium spike, cytotoxicity, synapse formation, and cytokine secretion.

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  • Robustness analysis considering parameter variations and stochasticity.
  • Analysis of signal integration over extended time periods.

    • Main Results:

    • Specificity improves with longer detection time windows, saturating on the timescale of TCR downregulation.
    • The calcium spike (30s) shows low specificity but high sensitivity to single-peptide MHC ligands.
    • The cytokine threshold (1h) can distinguish ligands with 30% variation in complex lifetime.
    • Signal integration over hours effectively controls parameter noise and enhances discrimination.
    • Discrimination characteristics are governed by TCR signal cascade kinetics (kinetic proofreading).

    Conclusions:

    • T-cell activation relies on a combination of threshold mechanisms and signal integration.
    • Signal integration over hours improves T-cell responsiveness to low ligand density and specificity to agonist quality.
    • Multiple thresholds likely coordinate stable contact interface formation for efficient signal integration.