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Related Experiment Videos

Programmed death of autoreactive thymocytes.

H R MacDonald1, R K Lees

  • 1Ludwig Institute for Cancer Research, Epalinges, Switzerland.

Nature
|February 15, 1990
PubMed
Summary
This summary is machine-generated.

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Mature T cells with self-reactive T-cell receptors (TCR) undergo programmed cell death in the thymus. This discovery reveals that clonal deletion, a key immune tolerance process, can occur in mature T lymphocytes.

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • T lymphocytes with high-affinity T-cell receptors (TCR) for self-antigens are eliminated during thymus development to prevent autoimmunity.
  • Previous studies suggested clonal deletion primarily targets immature CD4+CD8+ thymocytes.
  • The precise mechanisms and cell populations involved in autoreactive T cell deletion remained unclear.

Purpose of the Study:

  • To identify the specific cell populations and mechanisms involved in the clonal deletion of autoreactive T cells.
  • To investigate whether mature T cells can undergo deletion in the thymus.

Main Methods:

  • Analysis of thymocytes from neonatal mice using flow cytometry and TCR expression analysis.
  • Short-term culture of identified autoreactive T cells.

Related Experiment Videos

  • Assessment of cell death in culture with and without inhibitors of macromolecule synthesis.

    • Main Results:

    • A significant population of phenotypically mature CD4+CD8- T cells bearing autoreactive TCR was identified in the neonatal thymus.
    • In culture, 60% of these mature autoreactive T cells underwent selective cell death.
    • Inhibitors of RNA and protein synthesis prevented the death of these autoreactive cells, similar to glucocorticoid-induced thymocyte death.

    Conclusions:

    • Physiological clonal deletion of autoreactive T cells can occur in phenotypically mature CD4+CD8- thymocytes.
    • This deletion process involves programmed cell death, akin to apoptosis.
    • These findings challenge the notion that clonal deletion exclusively targets immature thymocytes.