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Related Experiment Videos

TCR specificity dictates CD94/NKG2A expression by human CTL.

Bana Jabri1, Jeanette M Selby, Horia Negulescu

  • 1Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA. bjabri@bsd.uchicago.edu

Immunity
|October 22, 2002
PubMed
Summary

T-cell receptor (TCR) specificity determines inhibitory NKG2A receptor expression in cytotoxic T lymphocytes (CTLs). This clonal attribute, acquired during antigen encounter, regulates CTL activation thresholds.

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Area of Science:

  • Immunology
  • Cellular immunology
  • T-cell biology

Background:

  • CD94/NKG2 receptors modulate cytotoxic T lymphocyte (CTL) responses by altering T-cell receptor (TCR) signaling.
  • These receptors influence the antigen activation thresholds established during thymic selection.

Purpose of the Study:

  • To investigate the link between TCR specificity and the expression of CD94/NKG2 receptors on CTLs.
  • To understand how TCR repertoire influences the development and regulation of CTL responses.

Main Methods:

  • High-resolution TCR repertoire analysis was performed on oligoclonal CTL expansions from human blood and tissues.
  • Examined the relationship between TCR sequence, antigen specificity, and NKG2A expression commitment.

Main Results:

Related Experiment Videos

  • Commitment to inhibitory NKG2A expression was identified as a clonal attribute acquired post-TCR expression and during antigen encounter.
  • Actual surface expression of NKG2A was dependent on recent TCR engagement.
  • CTL clones with sequence-related TCRs, sharing antigen specificity, consistently demonstrated the same NKG2A commitment.

Conclusions:

  • Antigenic specificity of the TCR is a key determinant of NKG2A commitment in CTLs.
  • This TCR-driven NKG2A commitment plays a critical role in regulating subsequent CTL activation.