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The subset of dendritic cells (DCs) and the nature of the signal inducing DC maturation determine the capacity of DCs to generate polarized immune responses. In this study, we show that the ability of human monocyte-derived DCs (myeloid DC(1)) to promote T helper type 1 (Th1) or Th2 differentiation was also found to be critically dependent on stimulator/responder ratio. At a low ratio (1:300), mature DCs that have been differentiated after inflammatory (Staphylococcus aureus Cowan 1 or lipopolysaccharide) or T cell-dependent (CD40 ligand) stimulation induced naive T cells to become Th2 (interleukin [IL]-4(+), IL-5(+), interferon gamma) effectors. Th2 differentiation was dependent on B7-CD28 costimulation and enhanced by OX40-OX40 ligand interactions. However, high DC/T cell ratio (1:4) favored a mixed Th1/Th2 cell development. Thus, the fact that the same DC lineage stimulates polarized Th1 or Th2 responses may be relevant since it allows the antigen-presenting cells to initiate an appropriate response for the signal received at the peripheral sites. Controlling the number and the rate of DC migration to the T cell areas in lymphoid tissues may be important for the therapeutic use of DCs.

Human Monocyte–Derived Dendritic Cells Induce Naive T Cell Differentiation into T Helper Cell Type 2 (Th2) or Th1/Th2 Effectors