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Related Experiment Videos

CD69 expression during selection and maturation of CD4+8+ thymocytes

W Swat1, M Dessing, H von Boehmer

  • 1Basel Institute for Immunology, Switzerland.

European Journal of Immunology
|March 1, 1993
PubMed
Summary

Positive selection of thymocytes is crucial for inducing CD 69 expression via T cell receptor (TCR) signaling. This process requires sustained TCR ligation for maturation and acquisition of proliferative capacity.

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Area of Science:

  • Immunology
  • Cell Biology
  • T cell development

Background:

  • T cell receptor (TCR) signaling is central to T cell development and function.
  • Protein kinase C (PKC) plays a role in T cell activation and differentiation.
  • CD 69 is an early activation marker expressed on lymphocytes.

Purpose of the Study:

  • To investigate the role of positive selection in the inducibility of CD 69 expression.
  • To analyze the signaling pathways involved in CD 69 expression during T cell development.
  • To understand the maturation process of positively selected thymocytes.

Main Methods:

  • Analysis of T cell receptor (TCR) transgenic thymocytes.
  • In vitro culture and stimulation of thymocytes.
  • Flow cytometry to assess CD 69 expression and TCR levels.

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  • Use of anti-TCR antibodies and phorbol 12-myristate 13-acetate (PMA) for stimulation.

    • Main Results:

    • Thymocytes developing without selecting MHC molecules showed impaired CD 69 induction upon TCR cross-linking.
    • Positive selection in the presence of MHC ligands enabled CD 69 expression in response to TCR stimulation.
    • Direct PKC activation by PMA induced CD 69 on all thymocytes, irrespective of selection.
    • Positively selected thymocytes require sustained TCR ligation for maturation, loss of deletion sensitivity, and proliferative capacity.

    Conclusions:

    • Positive selection couples TCR-mediated signals to the CD 69 expression pathway.
    • Sustained TCR ligation is essential for the maturation of positively selected thymocytes.
    • The selection process influences the ability of thymocytes to respond to TCR signals and proliferate.