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- W2084886678 abstract "Background. The immune response against xenografts is vigorous and poorly controlled with conventional immunosuppressants. Therefore, success in xenotransplantation will depend on developing additional approaches such as induction of immunologic unresponsiveness or tolerance. Although classic protocols of neonatal tolerance induction in mice are very tolerogenic in many allogeneic models, they have generally failed in xenogeneic models. The purpose of these studies was to determine whether failure results from an intrinsic property of xenogenic major histocompatibility complex (MHC) molecules themselves or, instead, is caused by some limitation in species-specific molecular interactions distinct from the polymorphic domains of xenogenic MHC molecules. Methods. Our approach was to test the ability of lymphoid cells from a transgenic (Tg) mouse donor expressing a xeno-MHC class I molecule encoding the polymorphic α1/α2 for human leukocyte antigen (HLA)-B7 to induce neonatal tolerance in non-Tg syngeneic C57BL/6 recipients. Because the donor and recipient strains are genetically identical (C57BL/6, H-2b) except for Tg human MHC HLA-B7, any species-specific molecular incompatibility in this mouse anti-human class I xeno-combination that could potentially interfere with induction of tolerance has been eliminated. Results. Our results show that HLA-B7 Tg-, but not C57BL/6 syngeneic-, injected neonates were unresponsive as adults to HLA–B7-expressing target cells in vitro and specifically accepted HLA–B7-expressing Tg skin grafts. In addition, neonatal injection of donor cells resulted in peripheral chimerism. Conclusions. These experiments demonstrate that, as long as species-specific molecular interactions are maintained, recognition of the polymorphic domains of xenogeneic MHC does not represent a barrier to neonatal tolerance induction." @default.
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- W2084886678 date "2004-09-27" @default.
- W2084886678 modified "2023-10-11" @default.
- W2084886678 title "Induction of Xenogeneic Neonatal Tolerance to Transgenic Human Leukocyte Antigen Class I Grafts" @default.
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- W2084886678 doi "https://doi.org/10.1097/01.tp.0000136965.22023.60" @default.
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