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Related Experiment Videos

Orally induced tolerance. Definition at the cellular level.

R G Titus, J M Chiller

    International Archives of Allergy and Applied Immunology
    |January 1, 1981
    PubMed
    Summary

    Oral administration of T-dependent antigens induces oral tolerance in mice by suppressing T cell function. However, T-independent antigens do not induce this anergy, preserving B cell function.

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    Area of Science:

    • Immunology
    • Oral Tolerance Induction

    Background:

    • Oral tolerance is a crucial mechanism for preventing immune responses against dietary antigens.
    • Understanding the cellular and molecular basis of oral tolerance is vital for developing immunotherapies.

    Purpose of the Study:

    • To investigate the differential effects of T-dependent and T-independent antigens on oral tolerance.
    • To elucidate the impact of parenteral priming on oral tolerance induction.
    • To characterize the functional status of T and B cells following oral antigen administration.

    Main Methods:

    • Mice were intragastrically exposed to various antigens (ovalbumin, bovine serum albumin, human gamma globulin, dinitrophenylated Ficoll, polyvinylpyrrolidone, LPS).
    • Parenteral priming with ovalbumin was performed prior to oral antigen challenge.
    • T cell functions (helper activity, proliferation, delayed-type hypersensitivity) and B cell responses were assessed.

    Main Results:

    • Intragastric administration of T-dependent antigens induced oral tolerance, compromising subsequent immune responses.
    • T-independent antigens did not induce oral tolerance or anergy.
    • Parenterally primed mice were refractory to oral tolerance induction and showed an anamnestic response.
    • Oral antigen exposure suppressed T cell functions but preserved OVA-specific functional B cells.

    Conclusions:

    • Oral tolerance is antigen-specific and dependent on the T cell compartment.
    • B cell immunity remains intact following oral tolerance induction.
    • This study provides insights into the mechanisms regulating oral tolerance and immune homeostasis.

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