These T cells were associated with multiple markers into 14 different cell types to identify subsets. The findings thus describe new CD8+ cell subsets, allow the identification of relatively homogeneous CD8+ subpopulations, provide a predictable and precise correlation between particular cell surface markers and CD8+ T-cell functional properties, and identify effector cells present in both CCR7-CD45RA+ and CCR7-CD45R0+ compartments. The results also indicate that activated cells might modulate the expression of CD45RA/R0 asynchronously rather than CCR7-CD45...

Down-regulation of CD83 expression on human DC through RNA interference (RNAi) results in a less potent induction of allogeneic T cell proliferation, reduced IFN-gamma secretion by established T cells and decreased capacity in the priming of functional tumor antigen-specific CD8+ T lymphocytes.

To quantify presentation of the epitopes by DC, we used bulk T cells electroporated with TCR-encoding RNA in stimulation assays.

We observed that ICAM-1 expression by mature DCs is critical for long-lasting contacts with CD8+ T cells, but dispensable for short-lived antigen-specific interactions. Serial brief T cell-dendritic cell contacts induced early CD8+ T cell activation, proliferation and effector CTL differentiation in the first few days after immunization.

We have determined mechanisms for DC-induced Th1 development and the molecular pathways for inducing Th1 cells producing IFN-gamma solely, or Th1 cells producing IFN-gamma and IL-10, which have important implications for regulation of the immune response to eradicate pathogens with minimum pathology.