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The growth threshold conjecture: a theoretical framework for understanding T-cell tolerance.

Clemente F Arias1, Miguel A Herrero2, José A Cuesta3

  • 1Departamento de Matemática Aplicada, and , Universidad Complutense de Madrid , Madrid, Spain ; Departamento de Ecología , Universidad Complutense de Madrid , Madrid, Spain.

Royal Society Open Science
|November 21, 2015
PubMed
Summary

T cells can distinguish between friend and foe by tolerating cells with slow proliferation rates. This immune tolerance mechanism, based on T-cell elasticity and inertia, explains tolerance to slow-growing pathogens.

Keywords:
T cellsimmune selfimmune toleranceimmunodominancenegative selection

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Area of Science:

  • Immunology
  • Theoretical Biology
  • Computational Immunology

Background:

  • Adaptive immunity relies on T cells recognizing specific antigens.
  • Distinguishing self from non-self is crucial, yet T cells face challenges when similar antigens are present on pathogens and host cells.
  • Existing models do not fully explain tolerance to slow-growing pathogens or the presence of self-reactive T cells.

Purpose of the Study:

  • To propose a novel mechanism for T cell-mediated immune tolerance.
  • To investigate how T cells can discriminate between healthy and potentially harmful cells based on proliferation rates.
  • To develop a theoretical framework that accounts for T cell dynamics during immune responses.

Main Methods:

  • Mathematical modeling of T-cell population dynamics, incorporating elasticity (expansion/contraction) and inertia (delayed contraction).
  • Simulations to analyze the behavior of T-cell populations in response to varying cell proliferation rates.
  • Analysis of model predictions in the context of established immunological principles and observations.

Main Results:

  • T cell tolerance to slow-growing cell populations can emerge as a population-level phenomenon.
  • The model demonstrates that T-cell inertia and elasticity contribute to distinguishing between rapidly and slowly proliferating cells.
  • The proposed mechanism provides a potential explanation for tolerance to certain slow-growing pathogens.

Conclusions:

  • Immune tolerance may be regulated by proliferation rate thresholds rather than solely by self/non-self recognition.
  • T-cell dynamics, specifically inertia and elasticity, play a key role in establishing tolerance.
  • This framework offers new insights into immune regulation and unexplained immunological observations.