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Related Experiment Videos

Precommitment of CD4+CD8+ thymocytes to either CD4 or CD8 lineages

T Crompton1, R K Lees, H Pircher

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

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 1993
PubMed
Summary

T-cell development in the thymus is complex. This study reveals that CD4+CD8+ thymocytes commit to either the CD4 or CD8 lineage independently of T-cell receptor specificity before positive selection.

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CD8+ T cell development: CD4 to the rescue.

Nature immunology·2001

Area of Science:

  • Immunology
  • Developmental Biology
  • T-cell Biology

Background:

  • Mature T cells (CD4+ and CD8+) develop from CD4+CD8+ precursors in the thymus.
  • T-cell receptor (TCR) specificity for self-major histocompatibility complex (MHC) molecules influences lineage commitment.
  • The instructional versus stochastic models debate the role of TCR specificity in T-cell lineage commitment.

Purpose of the Study:

  • To investigate the developmental fates of CD4+CD8+ thymocytes with a MHC class I-restricted transgenic TCR.
  • To determine whether TCR specificity or independent processes control lineage commitment.
  • To provide evidence supporting or refuting the instructional and stochastic models of T-cell development.

Main Methods:

  • Utilized a transgenic mouse model with a MHC class I-restricted TCR.

Related Experiment Videos

  • Analyzed thymocyte populations for lineage commitment and TCR gene rearrangement.
  • Employed in vivo blockade of TCR-MHC class II interactions to assess developmental pathways.

    • Main Results:

    • CD4+CD8+ thymocytes with a MHC class I-restricted TCR exhibited dual developmental potential.
    • One population differentiated into CD8+ T cells via MHC class I selection.
    • Another population rearranged endogenous TCR genes, engaged MHC class II, and matured into CD4+ T cells, independent of initial TCR specificity.

    Conclusions:

    • Data support a stochastic model of T-cell development, where lineage commitment precedes positive selection.
    • CD4+CD8+ thymocytes possess pre-existing lineage biases independent of TCR specificity.
    • TCR-MHC interactions are crucial for subsequent maturation but not initial lineage commitment.