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The Journal of Immunology, Vol 158, Issue 2 629-636, Copyright © 1997 by American Association of Immunologists
ARTICLES |
Y Ohshima and G Delespesse
University of Montreal, Louis-Charles Simard Research Center, Notre- Dame Hospital, Quebec, Canada.
Previous studies on human Th subset development were restricted to the analysis of naive T cells activated with anti-CD3 mAb in the absence of physiologic APC. In this study, we have analyzed the role of cytokines and physiologic APC on T cell maturation in an Ag-specific system, in which naive neonatal CD4 T cells were primed with allogeneic dendritic cells (DC). We found that the cytokine profile of primed cells was dependent upon 1) the ratio between T cells and allogeneic DC and 2) the endogenous production of IL-4 and IL-12. Neutralization of IL-4 during primary MLR increased IFN-gamma production at priming and shifted the phenotype of primed cells from Th0 to Th1. These effects were IL-12 dependent, in that they were suppressed by anti-IL-12 Abs. The production of IL-12 in primary MLR was further evidenced by the presence of IL-12 p40 in the culture supernatant fluids. IL-12 production was suppressed by exogenous IL-4 and increased by anti-IL-4 blocking mAbs, indicating that endogenous IL-4 down-regulated IL-12 production by DC. Finally, IL-12 was produced as a result of T cell/DC interaction involving the CD40/CD40 ligand and CD28/B7 costimulation pathways, as revealed by the inhibitory effect of anti-CD40 ligand mAb and CTLA-4Ig. These observations suggest that in neutral conditions, Ag presentation by DC results in the coordinate production of naive T cell- derived IL-4 and DC-derived IL-12 that in concert shape the cytokine profile of Th cells.
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