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• W2036018502 abstract "Rapamycin (RAPA) inhibits the mechanistic target of rapamycin (mTOR), a crucial immune system regulator. Dendritic cells (DC) generated in RAPA (RAPA-DC) enrich for CD4+ forkhead box p3 (FoxP3+) regulatory T cells and induce T cell apoptosis by an unknown mechanism. RAPA-DC also promote experimental allograft survival, yet paradoxically secrete increased IL-12, crucial for the generation of IFN-γ+ CD4+ T cells. However, IFN-γ is pro-apoptotic and IL-12-driven IFN-γ inhibits experimental graft-versus-host disease (GVHD). We hypothesized that IL-12hi RAPA-DC would facilitate IFN-γ-mediated apoptosis of alloreactive T cells and, unlike control (CTR)-DC, would reduce lethal GVHD. Following LPS stimulation, RAPA-DC exhibited decreased MHCII and co-stimulatory molecules and contained a significant population of CD86lo IL-12hi cells. Consistent with our hypothesis, both unstimulated and LPS-stimulated RAPA-DC enhanced alloreactive CD4+ T cell apoptosis in culture. Augmented T cell apoptosis was ablated by IFN-γ neutralization or using T cells lacking the IFN-γ receptor, and it was associated with increased expression of Fas and cleaved caspase 8. DC production or responses to IFN-γ were not important to increased apoptotic functions of RAPA-DC. LPS-stimulated IL-12p40−/− RAPA-DC induced lower levels of T cell apoptosis in culture, which was further decreased with addition of anti-IFN-γ. Finally, whereas CTR-DC accelerated mortality from GVHD, LPS-treated RAPA-DC significantly prolonged host survival. In conclusion, increased apoptosis of allogeneic CD4+ T cells induced by LPS-stimulated IL-12hi RAPA-DC is mediated in vitro through IFN-γ and in part by increased IL-12 expression. Enhanced production of IL-12, the predominant inducer of IFN-γ by immune cells, is a probable mechanism underlying the capacity of LPS-treated RAPA-DC to reduce GVHD." @default.
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• W2036018502 date "2014-02-01" @default.
• W2036018502 modified "2023-10-17" @default.
• W2036018502 title "IL-12hi Rapamycin-Conditioned Dendritic Cells Mediate IFN-γ–Dependent Apoptosis of Alloreactive CD4+ T Cells In Vitro and Reduce Lethal Graft-Versus-Host Disease" @default.
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• W2036018502 doi "https://doi.org/10.1016/j.bbmt.2013.11.007" @default.
• W2036018502 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3964782" @default.
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