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Related Experiment Videos

Cell cycle block in anergic T cells during tolerance induction.

Jiaren Sun1, M Alison Stalls, Katherine L Thompson

  • 1Department of Microbiology and Immunology, Sealy Center for Vaccine Development and Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch at Galveston, Galveston, TX 77555-1019, USA. jisun@utmb.edu

Cellular Immunology
|December 4, 2003
PubMed
Summary

Oral antigen exposure triggers T cell activation but limits their division, leading to tolerance. This restricted cell cycling, unlike in sensitization, suggests tolerance induction involves factors limiting T cell proliferation.

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Area of Science:

  • Immunology
  • T cell biology
  • Oral tolerance induction

Background:

  • Oral antigen administration can induce T cell anergy (unresponsiveness).
  • T cell activation and division precede anergy, similar to sensitization.
  • The precise mechanisms distinguishing tolerance from sensitization remain unclear.

Purpose of the Study:

  • To quantify T cell cycling after oral antigen exposure.
  • To compare T cell proliferation following oral antigen feeding versus conventional immunization.
  • To elucidate the role of cell cycle regulation in oral tolerance.

Main Methods:

  • Utilized a T lymphocyte transfer model specific to ovalbumin (OVA).
  • Measured antigen-specific CD4+ T cell cycling and proliferation (BrdU incorporation) after oral OVA feeding.

Related Experiment Videos

  • Compared T cell responses in orally tolerized mice versus conventionally immunized mice.

    • Main Results:

    • Antigen-specific T cells exhibited limited, abortive proliferation after oral antigen exposure.
    • T cells divided fewer times after oral OVA compared to OVA immunization.
    • T cell cycling stopped by day 4 in orally exposed mice, while continuing in sensitized mice.

    Conclusions:

    • Oral tolerance involves antigen-specific suppression of T cell proliferation.
    • Limited T cell division suggests tolerance is a default pathway requiring further stimuli for sensitization.
    • Factors limiting T cell cycle progression may actively induce tolerance.