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Related Experiment Videos

One I region restriction determinant can associate with multiple antigenic epitopes.

M Kimoto, C G Fathman

    Microbiology and Immunology
    |January 1, 1986
    PubMed
    Summary

    T cell clones recognize multiple epitopes on antigens restricted by the same I-A molecule. This suggests T cell specificity is governed by the T cell repertoire, not just antigen determinants.

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    Area of Science:

    • Immunology
    • Molecular Biology

    Background:

    • T cell recognition of antigens is crucial for adaptive immunity.
    • Antigen presentation by Major Histocompatibility Complex (MHC) molecules, specifically I-A, is a key step.
    • The concept of determinant selection proposes that T cells are restricted to specific antigenic epitopes.

    Purpose of the Study:

    • To investigate whether a single I-A molecule can restrict T cell clones recognizing different epitopes on multideterminant antigens.
    • To explore the implications of these findings for T cell specificity and determinant selection theory.

    Main Methods:

    • Utilized T cell clones reactive to specific multideterminant antigens like poly(L-Glu60, L-Ala30, L-Tyr10)n(GAT) and poly(Tyr, Glu)-poly D,L-Ala--poly Lys [(T,G)-A--L].
    • Employed monoclonal anti-I-A antibodies to block T cell clone recognition.

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  • Analyzed the effect of mutations in the Abm12 chain on T cell restriction using specific mouse strains.

    • Main Results:

    • Demonstrated that T cell clones recognizing distinct epitopes of multideterminant antigens can be restricted by the same I-A molecule.
    • Showed that a single I-A restriction site can present multiple antigenic epitopes.
    • Confirmed that monoclonal anti-I-A antibodies can block clones recognizing different epitopes on the same antigen.
    • Observed that mutations in the Abm12 chain influence the restriction determinant for clones recognizing different epitopes.

    Conclusions:

    • The findings challenge the strict tenability of the determinant selection theory.
    • Results support the model where T cell specificity is primarily controlled by the T cell repertoire.
    • A single MHC class II molecule can present diverse antigenic epitopes, broadening T cell recognition capabilities.