Increased TCR avidity after T cell activation: A mechanism for sensing low-density antigen

Tarek M. Fahmy, Joan Glick Bieler, Michael Edidin, Jonathan P. Schneck

Research output: Contribution to journalArticle

Abstract

While activated T cells are known to have enhanced biological responses to antigen stimulation, the biophysical basis of this increased sensitivity remains unknown. Here, we show that, on activated T cells, the TCR avidity for peptide-MHC complexes is 20- to 50-fold higher than the TCR avidity of naive T cells. This increased avidity for peptide-MHC depends on TCR reorganization and is sensitive to the cholesterol content of the T cell membrane. Analysis of the binding data indicates the enhanced avidity is due to increases in cross-linking of TCR on activated T cells. Activation-induced membrane (AIM) changes in TCR avidity represent a previously unrecognized means of increasing the sensitivity of activated T cells to small amounts of antigen in the periphery.

Original languageEnglish (US)
Pages (from-to)135-143
Number of pages9
JournalImmunity
Volume14
Issue number2
StatePublished - Jan 1 2001

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Infectious Diseases

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