Generation of human CD8 T regulatory cells by CD40 ligand-activated plasmacytoid dendritic cells

The Journal of Experimental Medicine
Michel Gilliet, Yong-Jun Liu

Abstract

Although CD8 T cell-mediated immunosuppression has been a well-known phenomenon during the last three decades, the nature of primary CD8 T suppressor cells and the mechanism underlying their generation remain enigmatic. We demonstrated that naive CD8 T cells primed with allogeneic CD40 ligand-activated plasmacytoid dendritic cells (DC)2 differentiated into CD8 T cells that displayed poor secondary proliferative and cytolytic responses. By contrast, naive CD8 T cells primed with allogeneic CD40 ligand-activated monocyte-derived DCs (DC1) differentiated into CD8 T cells, which proliferated to secondary stimulation and killed allogeneic target cells. Unlike DC1-primed CD8 T cells that produced large amounts of interferon (IFN)-gamma upon restimulation, DC2-primed CD8 T cells produced significant amounts of interleukin (IL)-10, low IFN-gamma, and no IL-4, IL-5, nor transforming growth factor (TGF)-beta. The addition of anti-IL-10-neutralizing monoclonal antibodies during DC2 and CD8 T cell coculture, completely blocked the generation of IL-10-producing anergic CD8 T cells. IL-10-producing CD8 T cells strongly inhibit the allospecific proliferation of naive CD8 T cells to monocytes, and mature and immature DCs. This inhibition was m...Continue Reading

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Methods Mentioned

BETA
FCS
fluorescence-activated cell sorting
Assay
ELISA
flow
PMA
PCR
flow cytometry

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