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Center for Immunotherapy of Cancer and Infectious Diseases, University of Connecticut Health Center, Farmington, CT 06030
It has long been established that exposure of naive T cells to specific Ag in the absence of adjuvant leads to tolerization. Nonetheless, the potential of effector CD4 cells to be tolerized has been less well characterized. To address this issue, we have used an adoptive transfer system in which naive TCR transgenic hemagglutinin (HA)-specific CD4+ T cells are initially primed to express effector function upon exposure to an immunogenic recombinant vaccinia virus expressing HA, and then exposed to forms of HA that are tolerogenic for naive CD4 cells. HA-specific effector CD4 cells residing in both the spleen as well as in two separate nonlymphoid tissues were tolerized upon exposure to high doses of exogenous soluble HA peptide. Additionally, tolerance could also be induced by bone marrow-derived APCs that cross-present parenchymally derived self-HA. Thus, effector CD4 cells are susceptible to similar tolerogenic stimuli as are naive CD4 cells.
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