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Related Experiment Videos

Developmental regulation of TCR efficiency.

N Dautigny1, B Lucas

  • 1INSERM U345, Institut Necker, Paris, France.

European Journal of Immunology
|September 29, 2000
PubMed
Summary

Mature T cells are unresponsive to self-antigens due to increased activation thresholds. T cell receptor (TCR) signaling efficiency is developmentally regulated, decreasing with maturation and increasing with differentiation into memory cells.

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Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • Mature T cells exhibit unresponsiveness to self-antigens encountered during thymic selection.
  • The molecular mechanisms underlying increased T cell activation thresholds during maturation remain unclear.
  • T cell receptor (TCR) down-modulation correlates with T cell responses in mature cells.

Purpose of the Study:

  • To investigate the developmental regulation of T cell receptor (TCR) signaling efficiency.
  • To elucidate the relationship between TCR expression levels and signaling capacity.
  • To understand the molecular basis for T cell unresponsiveness to self-antigens.

Main Methods:

  • Analysis of TCR down-modulation as a proxy for TCR signaling efficiency.
  • Studying T cell responses during thymic maturation and differentiation into memory lymphocytes.
  • Investigating the inverse relationship between TCR expression and signaling ability.

Main Results:

  • TCR signaling efficiency decreases during thymic maturation.
  • TCR signaling efficiency increases upon differentiation of naive T cells into memory lymphocytes.
  • TCR's ability to mediate full signaling is inversely regulated by its expression level.

Conclusions:

  • TCR signaling efficiency is developmentally programmed, impacting T cell responsiveness.
  • An inverse relationship exists between TCR expression level and its signaling capacity.
  • This regulatory mechanism may extend to other cell surface receptors beyond the immune system.

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