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Related Experiment Videos

Oral tolerance in experimental autoimmune encephalomyelitis

C C Whitacre1, I E Gienapp, A Meyer

  • 1Department of Medical Microbiology and Immunology, Ohio State University College of Medicine, Columbus, 43210, USA.

Annals of the New York Academy of Sciences
|February 13, 1996
PubMed
Summary

Oral administration of autoantigens suppresses autoimmune disease. Different doses induce distinct mechanisms: low doses promote active suppression, while high doses cause T-cell deletion, offering therapeutic potential.

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Area of Science:

  • Immunology
  • Autoimmunity

Background:

  • Oral administration of autoantigens suppresses autoimmune diseases.
  • Specific peptide sequences from autoantigens also show suppressive effects.
  • Oral tolerance is less effective with self-sequences compared to non-self or related sequences.

Purpose of the Study:

  • To elucidate the dose-dependent mechanisms of oral tolerance.
  • To investigate the role of antigen dose in T-lymphocyte response and deletion.
  • To evaluate the therapeutic potential of oral tolerance in various autoimmune models.

Main Methods:

  • Administering varying doses of autoantigens (e.g., MBP) orally to rats and mice.
  • Assessing tolerance reversal with Interleukin-2 (IL-2) injections.
  • Utilizing transgenic mouse models (MBP-TCR) to track T-cell behavior after oral antigen feeding.

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Main Results:

  • Low-dose oral antigen administration induces active suppression with TGF-beta1 release.
  • High-dose oral antigen administration leads to antigen-specific T-lymphocyte deletion.
  • IL-2 reversed low-dose tolerance but not high-dose tolerance, supporting distinct mechanisms.
  • Oral antigen feeding in transgenic mice caused T-cell trafficking to the intestine and subsequent depletion.

Conclusions:

  • Oral tolerance mechanisms are dose-dependent, involving active suppression or T-cell deletion.
  • Oral tolerance demonstrates therapeutic efficacy across multiple animal models of autoimmune disease.
  • Promising preliminary results in human trials for multiple sclerosis, rheumatoid arthritis, and uveitis.