Differential control of T regulatory cell proliferation and suppressive activity by mature plasmacytoid versus conventional spleen dendritic cells

The Journal of Immunology : Official Journal of the American Association of Immunologists
Asmahan OuabedRégis Josien

Abstract

Anergy and suppression are cardinal features of CD4(+)CD25(+)Foxp3(+) T cells (T regulatory cells (Treg)) which have been shown to be tightly controlled by the maturation state of dendritic cells (DC). However, whether lymphoid organ DC subsets exhibit different capacities to control Treg is unclear. In this study, we have analyzed, in the rat, the role of splenic CD4(+) and CD4(-) conventional DC and plasmacytoid DC (pDC) in allogeneic Treg proliferation and suppression in vitro. As expected, in the absence of exogenous IL-2, Treg did not expand in response to immature DC. Upon TLR-induced maturation, all DC became potent stimulators of CD4(+)CD25(-) T cells, whereas only TLR7- or TLR9-matured pDC induced strong proliferation of CD4(+)CD25(+)Foxp3(+) T cells in the absence of exogenous IL-2. This capacity of pDC to reverse Treg anergy required cell contact and was partially CD86 dependent and IL-2 independent. In suppression assays, Treg strongly suppressed proliferation and IL-2 and IFN-gamma production by CD4(+)CD25(-) T cells induced by mature CD4(+) and CD4(-) DC. In contrast, upon stimulation by mature pDC, proliferating Treg suppressed IL-2 production by CD25(-) cells but not their proliferation or IFN-gamma production. ...Continue Reading

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