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The Journal of Immunology, Vol 149, Issue 7 2300-2306, Copyright © 1992 by American Association of Immunologists
ARTICLES |
M Luqman and K Bottomly
Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06510.
Murine CD4+ T cells can be subdivided into naive and memory T cells based on surface phenotype, on recall response to Ag, and on differences in activation requirements. Furthermore, several studies have shown that two signals are required for CD4+ T cell activation; one signal is provided by occupancy of the TCR and the other signal is provided by the APC. In this report, analysis of naive and memory CD4 T cells, separated on the basis of CD45 isoform expression, has shown that their requirements for two signals differ. Activation of memory CD4 T cells to proliferate and secrete IL-2/IL-4 only required occupancy of the TCR complex, whereas activation of naive CD4 T cells required an APC-derived signal as well. Moreover, the signal induced by anti-CD3 antibodies differs from the signal provided by anti-V beta cross-linking of the TCR because both antibodies activate memory CD4 T cells but only anti-CD3 activates naive CD4 T cells. Together these data suggest that the consequence of stimulation through the TCR/CD3 signal complex differs between memory and naive CD4 T cells.
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