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- W4313408122 abstract "Abstract Graft versus host disease (GVHD) is a severe, often lethal, complication of hematopoietic stem cell transplantation, and although prophylactic regimens are given as standard pre-transplantation therapy, up to 60% of these patients develop aGVHD, and require additional immunosuppressive intervention. Previously we showed that treatment of mice with a purified probiotic molecule, exopolysaccharide (EPS) from Bacillus subtilis, significantly increased survival of GVHD mice compared to control PBS-treated mice (70% vs 10%, respectively), with EPS-treated mice surviving more than 100 days after aGVHD induction. To test if EPS can also ameliorate GVHD in humans, we used humanized NSG-HLA-A2 mice and induced GVHD by i.v. injection of HLA-A2neg human PBMCs. After deriving dendritic cells (DC) from CD34+ cord blood cells, we pretreated them with EPS or PBS, and injected them together with PMBCs into the NSG-HLA-A2 mice. We found that EPS-treated DC significantly prolonged the survival of these mice, compared to PBS-treated DC. We also found that EPS-treated DC downregulated expression of activation markers (CD80, CD86), upregulated expression of inhibitory molecules (PD-L1, PD-L2), and inhibited activation of alloreactive T cells in MLR. We conclude that EPS induces tolerogenic human DC, which ameliorate GVHD in humanized NSG-HLA-A2 mice, likely by inhibiting alloreactive T cell response. Supported by NIH R41 AI155281" @default.
- W4313408122 created "2023-01-06" @default.
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- W4313408122 date "2022-05-01" @default.
- W4313408122 modified "2023-09-27" @default.
- W4313408122 title "Dendritic cell-based amelioration of graft versus host disease in humanized mice" @default.
- W4313408122 doi "https://doi.org/10.4049/jimmunol.208.supp.175.07" @default.
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