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- W2030332021 abstract "Patients with autoimmune lymphoproliferative syndrome (ALPS) and lymphoproliferation (LPR) mice are deficient in Fas, and accumulate large numbers of αβ-TCR+, CD4−, CD8− double negative (DN) T cells. The function of these DN T cells remains largely unknown. The common γ subunit of the activating Fc receptors, FcRγ, plays an important role in mediating innate immune responses. We have shown previously that a significant proportion of DN T cells express FcRγ, and that this molecule is required for TCR transgenic DN T cells to suppress allogeneic immune responses. Whether FcRγ plays a critical role in LPR DN T cell-mediated suppression of immune responses to auto and allo-antigens is not known. Here, we demonstrated that FcRγ+, but not FcRγ− LPR DN T cells could suppress Fas+ CD4+ and CD8+ T cell proliferation in vitro and attenuated CD4+ T cell-mediated graft-versus host disease. Although FcRγ expression did not allow LPR DN T cells to inhibit the expansion of Fas-deficient cells within the LPR context, adoptive transfer of FcRγ+, but not FcRγ−, DN T cells inhibited lymphoproliferation in generalized lymphoproliferative disease (GLD) mice. Furthermore, FcRγ acted in a cell-intrinsic fashion to limit DN T cell accumulation by increasing the rate of apoptosis in proliferated cells. These results indicate that FcRγ can confer Fas-dependent regulatory properties on LPR DN T cells, and suggest that FcRγ may be a novel marker for functional DN Tregs." @default.
- W2030332021 created "2016-06-24" @default.
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- W2030332021 date "2013-06-06" @default.
- W2030332021 modified "2023-09-27" @default.
- W2030332021 title "FcRγ Controls the Fas-Dependent Regulatory Function of Lymphoproliferative Double Negative T Cells" @default.
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- W2030332021 doi "https://doi.org/10.1371/journal.pone.0065253" @default.
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