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Division of Monoclonal Antibodies and
Division of Cell and Gene Therapy, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20892
T cells play a central role in the initiation, maintenance, and regulation of the immune response. Effector responses of T cells are controlled by complex combinations of lymphokines and adhesion/costimulatory molecule signals. To isolate the effects of specific adhesion/costimulatory molecules and to define the minimal molecular requirements of naive CD8+ T cell activation, we have developed an APC-free system for stimulation of naive CD8+ T cells. In this report, we demonstrate that immobilized MHC class I-peptide complexes can activate naive CD8+ T cells from TCR transgenic mice at low cell densities. The CD8+ T cells were stimulated to proliferate and secrete IL-2 independently of the molecular interactions between CD28/B7.1-B7.2 or LFA-1/ICAM-1 surface receptors. Previous reports have shown that CD28 ligation is necessary for late T cell survival of APC-stimulated naive CD8+ T cells. Our data suggest that under certain specific conditions of high intensity T cell signaling, early activation and late cell proliferation can occur independently of APC-derived costimulatory signals.
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