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Related Experiment Videos

CD69 cell surface expression identifies developing thymocytes which audition for T cell antigen receptor-mediated

I Yamashita1, T Nagata, T Tada

  • 1Department of Immunology, Faculty of Medicine, University of Tokyo, Japan.

International Immunology
|September 1, 1993
PubMed
Summary

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CD69, a T cell activation marker, is found on thymocytes undergoing positive selection. This study identifies CD69+ thymocytes as key players in T cell receptor-mediated selection within the thymus.

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • CD69 is a known T cell activation marker.
  • Its presence on thymocytes suggests a role in T cell development.

Purpose of the Study:

  • To investigate the role of CD69 expression in thymocyte selection.
  • To determine if CD69 can identify thymocytes involved in T cell receptor (TCR)-mediated positive selection.

Main Methods:

  • Flow cytometry analysis of thymocyte populations.
  • Phenotypic characterization of CD69+ thymocytes.
  • Analysis of TCR transgenic mouse models.

Main Results:

  • CD69 is expressed on approximately 10% of normal thymocytes, including transitional populations.

Related Experiment Videos

  • CD69+ thymocytes lack the mature T cell marker Qa-2.
  • TCR engagement with MHC molecules is necessary for CD69 expression.
  • TCR transgenic models show increased CD69+ thymocytes in positively selecting thymuses.

    • Conclusions:

    • CD69+ thymocytes represent cells undergoing or recently having undergone positive selection.
    • Surface CD69 expression is a valuable marker for identifying thymocytes involved in TCR-mediated positive selection.