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Related Experiment Videos

Activation-driven programmed cell death and T cell receptor zeta eta expression.

M Merćep1, A M Weissman, S J Frank

  • 1Biological Response Modifiers Program, National Cancer Institute, Bethesda, MD 20892.

Science (New York, N.Y.)
|December 1, 1989
PubMed
Summary

T cell hybridomas lacking the zeta eta heterodimer produced inositol phosphates (IP) and interleukin-2 (IL-2) but did not undergo programmed cell death upon activation. This suggests the zeta eta.TCR plays a role in negative selection.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • T cell activation typically induces interleukin-2 (IL-2) production, cell cycle arrest, and programmed cell death.
  • The T cell receptor (TCR) complex, including the zeta chain, is crucial for T cell signaling.
  • The role of specific TCR zeta chain heterodimers in T cell activation and apoptosis is not fully understood.

Purpose of the Study:

  • To investigate the function of the TCR zeta eta heterodimer in T cell activation and programmed cell death.
  • To determine the signaling capacity of T cell hybridomas lacking the zeta eta heterodimer.
  • To explore the implications of these findings for T cell development and negative selection.

Main Methods:

  • Studied T cell hybridomas with and without the TCR zeta eta heterodimer.

Related Experiment Videos

  • Stimulated cells with antigen and anti-CD3 antibody.
  • Measured inositol phosphate (IP) production and IL-2 secretion.
  • Assessed cell cycle progression and programmed cell death.

    • Main Results:

    • T cell hybridomas lacking the zeta eta heterodimer produced minimal inositol phosphates (IP) upon antigen stimulation.
    • These cells showed impaired phosphoinositide hydrolysis after CD3 antibody stimulation, with one exception.
    • Cells lacking the zeta eta heterodimer secreted IL-2 and exhibited a cell cycle block but did not undergo programmed cell death.
    • Activated thymocytes normally undergo programmed cell death, highlighting a difference in zeta eta- cells.

    Conclusions:

    • The zeta eta.TCR is involved in efficient T cell activation signaling, including IP production.
    • The zeta eta.TCR is critical for inducing programmed cell death in activated T cells.
    • These findings suggest a significant role for the zeta eta.TCR in the process of negative selection during T cell development.