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. 1996 Feb 20;93(4):1401–1405. doi: 10.1073/pnas.93.4.1401

Kinetic discrimination in T-cell activation.

J D Rabinowitz 1, C Beeson 1, D S Lyons 1, M M Davis 1, H M McConnell 1
PMCID: PMC39950  PMID: 8643643

Abstract

We propose a quantitative model for T-cell activation in which the rate of dissociation of ligand from T-cell receptors determines the agonist and antagonist properties of the ligand. The ligands are molecular complexes between antigenic peptides and proteins of the major histocompatibility complex on the surfaces of antigen-presenting cells. Binding of ligand to receptor triggers a series of biochemical reactions in the T cell. If the ligand dissociates after these reactions are complete, the T cell receives a positive activation signal. However, dissociation of ligand after completion of the first reaction but prior to generation of the final products results in partial T-cell activation, which acts to suppress a positive response. Such a negative signal is brought about by T-cell ligands containing the variants of antigenic peptides referred to as T-cell receptor antagonists. Results of recent experiments with altered peptide ligands compare favorably with T-cell responses predicted by this model.

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Selected References

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