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Positive and negative thymocyte selection

T Saito1, N Watanabe

  • 1Department of Molecular Genetics, Chiba University, Graduate School of Medicine, Japan.

Critical Reviews in Immunology
|August 15, 1998
PubMed
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T cell development relies on T cell receptor (TCR) signal strength to determine cell fate during thymic selection. Signal thresholds dictate whether thymocytes survive, differentiate into CD4+ or CD8+ single-positive cells, or undergo deletion.

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • T cells develop from double-negative (DN) precursors through double-positive (DP) to single-positive (SP) stages.
  • The pre-TCR complex is crucial for early T cell development and transition from DN to DP stages.
  • DP thymocytes undergo positive and negative selection, crucial for immune system function.

Purpose of the Study:

  • To elucidate the role of T cell receptor (TCR) signal strength in determining thymocyte fate.
  • To understand how varying TCR signal avidity influences thymocyte differentiation and selection.
  • To explore the signaling pathways involved in positive and negative selection and lineage commitment.

Main Methods:

  • Analysis of thymocyte differentiation stages (DN, DP, SP).

Related Experiment Videos

  • Investigation of T cell receptor (TCR) signaling pathways, including ZAP-70, Lck, calcineurin, and MAPK.
  • Assessment of coreceptor (CD4, CD8) contribution to TCR signaling.
  • Examination of Notch-mediated signaling in CD8+ cell development.

    • Main Results:

    • TCR signal strength, influenced by TCR-pMHC avidity and coreceptor expression, dictates thymocyte fate.
    • Increasing TCR signals lead sequentially from default death to positive selection, then negative selection.
    • Distinct signaling pathways, like calcineurin and MAPK, are critical for positive selection.
    • CD4 and CD8 lineage commitment is differentially regulated by TCR signal strength and specific signals like Notch.

    Conclusions:

    • TCR signal avidity is a key determinant of thymocyte survival, differentiation, and lineage commitment.
    • Understanding these signaling thresholds is vital for comprehending T cell development and immune homeostasis.
    • Targeting these pathways could offer therapeutic strategies for immune disorders.