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Related Experiment Videos

Partial T cell activation with an altered superantigenic ligand.

J D Hayball1, R A Lake

  • 1University Department of Medicine, Queen Elizabeth II Medical School, Nedlands, Western Australia, Australia. John.Hayball@imvs.sa.gov.au

Immunology and Cell Biology
|January 29, 2000
PubMed
Summary

Staphylococcal enterotoxin B (SEB) mutated in a T cell receptor (TCR) binding site acts as a partial agonist. This altered ligand partially activates T cells without inducing cytokine secretion or proliferation, revealing new insights into T cell receptor ligand interactions.

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Area of Science:

  • Immunology
  • Molecular Biology
  • T cell receptor signaling

Background:

  • T cells recognize ligands as agonists or antagonists, influencing their activation state.
  • Staphylococcal enterotoxin B (SEB) is a superantigen that binds to the T cell receptor (TCR).

Purpose of the Study:

  • To investigate the behavior of a mutated SEB (SEBDelta61Y) in a T cell receptor (TCR) contact site.
  • To determine if SEBDelta61Y acts as a partial agonist or antagonist for T cells expressing Vbeta17 TCR.

Main Methods:

  • Stimulation of T cell clone AC20 (Vbeta17 TCR) with SEB and SEBDelta61Y.
  • Analysis of TCR down-modulation and IL-2 receptor up-regulation.
  • Measurement of cytokine secretion (IL-2, IL-3, IL-4, IFN-gamma) and cell proliferation.

Related Experiment Videos

  • Assessment of intracellular protein tyrosine phosphorylation patterns.

    • Main Results:

    • SEBDelta61Y induced partial T cell activation, evidenced by TCR down-modulation and IL-2 receptor up-regulation.
    • Despite partial activation, SEBDelta61Y-stimulated T cells did not secrete cytokines or proliferate.
    • Intracellular phosphorylation patterns differed quantitatively and qualitatively between SEB and SEBDelta61Y stimulation.
    • Stimulation of a transfectant with the same TCR showed only quantitative differences.

    Conclusions:

    • Mutated superantigen SEBDelta61Y functions as a partial agonist, not a null agonist or antagonist.
    • Altered TCR ligands can arise from mutations within the superantigen's TCR binding site.
    • This study demonstrates that partial agonism is a possible outcome for altered TCR ligands, expanding understanding beyond peptide modifications.