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Abstract
Vascularized skins were 3D printed using single donor human fibroblasts, pericytes, keratinocytes, and endothelial cells (ECs), the latter either unmodified (WT-ECs) or deleted of MHC molecules (KO-ECs). Adult MISTRG6 immunodeficient mice neonatally inoculated with adult human hematopoietic stem cells (HSCs) received printed skin allogeneic to the HSCs and were boosted 3 weeks after grafting with human PBMCs autologous to the HSCs. HSC inoculation alone produced low levels of circulating human myeloid and lymphoid cells without affecting grafts; PBMC boosting dramatically increased circulating human CD4+ T cells and boosted CD8+ T cells only in mice with WT-EC grafts. These grafts became infiltrated by human macrophages, dendritic cells, CD4+ and CD8+ T cells and showed evidence of rejection. Shared T cell clones were present in skin and spleen. KO-EC grafts had minimal infiltration of graft or spleen without rejection, despite MHC molecule expression on other graft cell types.
Authors
Zuzana Tobiasova, Esen Sefik, Lingfeng Qin, Jennifer M. McNiff, Gwendolyn Davis, Richard A. Flavell, W. Mark Saltzman, Jordan S. Pober
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