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Related Experiment Videos

Activation events during thymic selection.

A Bendelac1, P Matzinger, R A Seder

  • 1Laboratory of Cellular and Molecular Immunology, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20892.

The Journal of Experimental Medicine
|March 1, 1992
PubMed
Summary
This summary is machine-generated.

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Mouse thymus CD4+8- cells show activation markers and produce diverse cytokines during differentiation. These functional changes, including increased IL-4 production, are transient but detectable after migration to the periphery.

Area of Science:

  • Immunology
  • Cell Biology
  • T cell differentiation

Background:

  • During T cell differentiation in the thymus, CD4+8- cells exhibit changes similar to mature T cell activation.
  • Early (CD69) and late (CD44) activation markers are dynamically expressed during thymocyte maturation.

Purpose of the Study:

  • To investigate the functional and phenotypic changes of CD4+8- thymocytes during differentiation.
  • To determine if intrathymic activation influences peripheral T cell function.

Main Methods:

  • Flow cytometry for marker expression (CD69, CD44, HSA).
  • Intracellular cytokine staining (IL-2, IL-4, IL-5, IL-10, IFN-gamma) after T cell receptor (TCR) stimulation.
  • In vitro organ culture and in vivo cell tracking studies.

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Main Results:

  • CD69 expression peaks at intermediate stages and downregulates by the mature HSAlo stage.
  • Cytokine production expands from IL-2 to include significant IL-4, IL-5, IL-10, and IFN-gamma at the HSAlo stage.
  • IL-4 production capacity decreases with time in organ culture and after peripheral migration, unlike IL-2 production.

Conclusions:

  • Thymic selection involves an activation process, not just survival rescue.
  • Intrathymic activation induces transient functional changes in CD4+8- thymocytes that persist in the periphery.