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Neonatal tolerance revisited by mathematical modelling

J A Borghans1, R J de Boer

  • 1Theoretical Biology, Utrecht University, The Netherlands.

Scandinavian Journal of Immunology
|September 22, 1998
PubMed
Summary

Neonatal immune tolerance is not absolute. A new model explains how T cell numbers and antigen-presenting cell (APC) doses reconcile neonatal immunity with adult tolerance.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Computational Biology

Background:

  • The classical view posits a neonatal tolerance window where infants cannot mount immune responses.
  • Recent studies challenge this, showing neonates can develop immunity, particularly against male antigen H-Y.
  • Adults, conversely, often develop tolerance with large antigen doses.

Purpose of the Study:

  • To reconcile conflicting data on neonatal immunity and adult tolerance.
  • To explain the mechanisms underlying immune responses or tolerance in different age groups.
  • To develop a model that integrates T cell and antigen-presenting cell (APC) dynamics.

Main Methods:

  • Development of a probabilistic model.
  • Analysis of T cell numbers in recipients.
  • Evaluation of endogenous and donor antigen-presenting cell (APC) dose and quality.

Main Results:

  • The model successfully explains neonatal immunity induction with specific APC doses.
  • The model accounts for adult tolerance induction with high spleen cell doses.
  • Recipient T cell counts and APC characteristics are key factors.

Conclusions:

  • Neonatal immune responses are possible and depend on specific cellular and dose-related factors.
  • The probabilistic model reconciles the neonatal tolerance window concept with observed immune responses.
  • Immune tolerance and immunity are quantitatively regulated by cellular interactions and antigen presentation.

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