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Related Experiment Videos

A reversible defect in alpha-beta T cell receptor assembly

H Maecker1, J T Thomas, R L Consorti

  • 1Department of Medicine/Oncology, Stanford University Medical Center, Stanford, California 94305, USA.

Experimental Cell Research
|February 25, 1996
PubMed
Summary
This summary is machine-generated.

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Tissue antigens·2011

T cell lines can rapidly gain and lose T cell receptor/CD3 (TCR/CD3) expression, a phenomenon not seen with MHC molecules. This loss results from impaired disulfide linkage between TCR alpha and beta chains, indicating novel posttranslational regulation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • T cell receptor/CD3 (TCR/CD3) complex expression is critical for T cell function.
  • The SUP-T13 leukemia cell line exhibits rapid, non-mutational gain and loss of TCR/CD3 expression.
  • Understanding the regulation of TCR/CD3 expression is crucial for T cell biology.

Purpose of the Study:

  • To investigate the generality of TCR/CD3 expression switching in other T cell lines.
  • To determine if this phenomenon is specific to the TCR/CD3 complex.
  • To elucidate the molecular mechanism behind TCR/CD3 loss in SUP-T13 cells.

Main Methods:

  • Screening of additional T cell lines for TCR/CD3 expression variability.
  • Analysis of Class I MHC molecule expression as a control.

Related Experiment Videos

  • Pulse-chase labeling and immunoprecipitation to study protein association in SUP-T13 cells.

    • Main Results:

    • Two other T cell lines demonstrated similar rates of TCR/CD3 expression gain and loss.
    • Class I MHC molecules did not exhibit this switching behavior, ruling out analysis artifacts.
    • In TCR/CD3 negative SUP-T13 cells, TCR alpha chains were produced but failed to form disulfide bonds with TCR beta-CD3 proteins.

    Conclusions:

    • The rapid switching of TCR/CD3 expression is a general phenomenon in some T cell lines.
    • This regulation is specific to the TCR/CD3 complex, not a general cellular artifact.
    • TCR/CD3 loss is mediated by a failure in the posttranslational disulfide linkage between TCR alpha and beta chains, representing a novel regulatory mechanism.