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Related Experiment Videos

I-A-controlled T cell molecules: protease sensitivity.

D A Hullett, K K Klyczek, C E Hayes

    Journal of Immunology (Baltimore, Md. : 1950)
    |December 1, 1984
    PubMed
    Summary
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    The I-A subregion-controlled structure (I-At) on T cells is shielded by a trypsin-labile substance. Limited proteolysis exposes this molecule, potentially indicating T cell activation.

    Area of Science:

    • Immunology
    • Molecular Biology
    • Cell Biology

    Background:

    • Helper T cells possess an I-A subregion-controlled structure (I-At).
    • This structure is an epitope associated with a glycoprotein.
    • The I-At molecule's presence and regulation on T cells are not fully understood.

    Purpose of the Study:

    • To investigate the nature of the I-At molecule on T cells.
    • To determine the effect of enzymatic treatment on I-At expression.
    • To explore the relationship between I-At shielding and T cell activation.

    Main Methods:

    • Enzymatic digestion with trypsin was used to assess the I-At molecule.
    • Tunicamycin and cycloheximide were employed to study biosynthesis and reexpression.
    • Flow cytometry was used to quantify T cells expressing the I-At epitope.

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    Main Results:

    • Extended trypsin digestion removed the I-At determinant, while tunicamycin blocked reexpression.
    • Limited trypsinization increased I-At-bearing T cells from 17% to 35%, suggesting exposure of a shielded molecule.
    • Previously negative T cells (20%) expressed I-At after mild proteolysis, indicating a shielded state.
    • Cycloheximide inhibited biosynthesis of both I-At and the shielding substance.
    • B cell I-A molecules showed no shielding or trypsin lability.

    Conclusions:

    • The I-At molecule is shielded by trypsin-labile material on some T cells, while fully exposed on others.
    • The transition from a shielded to an exposed configuration may correlate with T cell activation.
    • I-At molecules on T cells differ significantly from I-A-encoded molecules on B cells.