Modulation of Xenogeneic T-cell Proliferation by B7 and mTOR Blockade of T Cells and Porcine Endothelial Cells.
Modulation of Xenogeneic T-cell Proliferation by B7 and mTOR Blockade of T Cells and Porcine Endothelial Cells.
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DOI：
10.1097/tp.0000000000003920
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发表时间：
2022-05-01
期刊：
影响因子：
6.2
通讯作者：
Kirk AD
中科院分区：
文献类型：
--
作者：
Li S;Xu H;Kirk AD
Activation of porcine endothelial cells (PECs) is the mechanistic centerpiece of xenograft rejection. This study sought to characterize the immuno-phenotype of human T cells in response to PECs and to explore the immuno-modulation of B7 and mTOR blockade of T cells and/or PECs during xeno-responses. Rapid memory T-cell (TM) responses to PECs were assessed by an intracellular cytokine staining. T-cell proliferation to PEC with or without belatacept or rapamycin were evaluated by a mixed lymphocyte-endothelial cell reaction (MLER). Additionally, rapamycin-pretreated PECs were used in MLER. Cell phenotypes were analyzed by flow cytometry. TNF-α/IFN-γ producers were detected in CD8+ cells stimulated by human endothelium but not PECs. MLER showed proliferation of CD4+ and CD8+ cells with predominantly memory subsets. Purified memory and naïve cells proliferated following PEC-stimulation with an increased frequency of TM in PEC-stimulated naïve cells. Proliferating cells upregulated PD-1 and CD2 expression. Belatacept partially inhibited T-cell proliferation with reduced CD2 expression and frequency of the CD8+CD2highCD28− subset. Rapamycin dramatically inhibited PEC-induced T cell proliferation, and rapamycin-preconditioned PECs failed to induce T-cell proliferation. PD-1 blockade did not restore T-cell proliferation to rapamycin-preconditioned PECs. Humans lack rapid TM–mediated responses to PECs, but induce T-cell proliferative responses characterized largely as TM with increasing CD2 and PD-1 expression. B7-CD28 and mTOR blockade of T cells exhibit dramatic inhibitory effects in altering xeno-proliferating cells. Rapamycin alter PEC xeno-immunogenicity leading to inhibition of xeno-specific T-cell proliferation independent of PD-1-PD ligand interaction.
