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• W1787622862 abstract "After organ transplantation, recipient T cells contribute to graft rejection. Mesenchymal stromal cells from the bone marrow (BM-MSCs) are known to suppress allogeneic T-cell responses, suggesting a possible clinical application of MSCs in organ transplantation. Human liver grafts harbor resident populations of MSCs (L-MSCs). We aimed to determine the immunosuppressive effects of these graft-derived MSCs on allogeneic T-cell responses and to compare these with the effects of BM-MSCs. BM-MSCs were harvested from aspirates and L-MSCs from liver graft perfusates. We cultured them for 21 days and compared their suppressive effects with the effects of BM-MSCs on allogeneic T-cell responses. Proliferation, cytotoxic degranulation, and interferon-gamma production of alloreactive T cells were more potently suppressed by L-MSCs than BM-MSCs. Suppression was mediated by both cell–cell contact and secreted factors. In addition, L-MSCs showed ex vivo a higher expression of PD-L1 than BM-MSCs, which was associated with inhibition of T-cell proliferation and cytotoxic degranulation in vitro. Blocking PD-L1 partly abrogated the inhibition of cytotoxic degranulation by L-MSCs. In addition, blocking indoleamine 2,3-dioxygenase partly abrogated the inhibitive effects of L-MSCs, but not BM-MSCs, on T-cell proliferation. In conclusion, liver graft-derived MSC suppression of allogeneic T-cell responses is stronger than BM-MSCs, which may be related to in situ priming and mobilization from the graft. These graft-derived MSCs may therefore be relevant in transplantation by promoting allohyporesponsiveness." @default.
• W1787622862 created "2016-06-24" @default.
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• W1787622862 date "2015-06-15" @default.
• W1787622862 modified "2023-09-25" @default.
• W1787622862 title "Human Graft-Derived Mesenchymal Stromal Cells Potently Suppress Alloreactive T-Cell Responses" @default.
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• W1787622862 doi "https://doi.org/10.1089/scd.2014.0485" @default.
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