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The Journal of Immunology, 1998, 160: 3698-3704.
Copyright © 1998 by The American Association of Immunologists

Modulation of Naive CD4 T Cell Activation with Altered Peptide Ligands: The Nature of the Peptide and Presentation in the Context of Costimulation Are Critical for a Sustained Response1

Paul R. Rogers, Howard M. Grey and Michael Croft2

Division of Immunochemistry, La Jolla Institute for Allergy and Immunology, San Diego, CA 92121

Altered peptide ligands containing single amino acid substitutions have the potential to be used for modulating immune function. Using a panel of moth cytochrome c peptides, we demonstrate that different phases of naive CD4 T cell response are alternately modulated depending on altered peptide ligand dose and accessory molecule expression by APC. Weak agonists presented at high concentration, and with costimulation, efficiently induced early phase naive T cell activation as assessed by IL-2R/CD69 expression, but could only promote sufficient IL-2 for a short-lived proliferative response. In contrast, strong agonists and heteroclitic peptides induced early phase T cell activation even at low concentrations with costimulation, and allowed sustained IL-2 secretion and proliferation. In the absence of accessory molecule help, early and late phase activation was impaired with weak agonists, whereas strong agonists partially compensated for a lack of costimulation for early phase activation, and also promoted enhanced IL-2 with sustained proliferation. These studies support the hypothesis that the naive T cell response will be determined by the balance between provision of accessory molecule help and the affinity of peptide/MHC complexes for individual TCRs, and suggest that extended IL-2 production is the main facet of naive CD4 activation that is affected by altering the nature of the peptide.




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