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- W2022681912 abstract "CURRENTLY, transplantation is the best treatment for patients with end-stage organ disease. However, organ shortage severely limits the number of patients who can be treated this way and leads to increased mortality on organ waiting lists. On the other hand, appropriate animals are considered limitless alternative organ sources for such patients. Accordingly, intensive research is underway at many centers to overcome the biological barriers which currently stand in the way of organ acceptance between species. Hyperacute rejection is invariably seen after discordant xenotransplantations with immediate vascular reconstruction. Various strategies have been proposed to solve this problem. Apart from the considerable success achieved with transfection of recipient complement regulatory genes to the donor, no satisfactory progress has been made in overcoming or eliminating this type of rejection. Immunologic tolerance induction against nonself tissues is an attractive means of achieving total or partial acceptance of transplanted organs. The best-known attempts regarding tolerance induction have involved the administration of donor-specific antigens (DSA) (ie, donor-specific cells [DSCs] or, rarely, donor-specific cell-free extracts [DCFE] to the recipient through various routes, with or without concomitant immunosuppression. It has been demonstrated that donor-specific transfusion (DST), or the administration of DSA via various routes to the recipient prior to allotransplantations, generally evokes a certain tolerance status and prolongs allograft survival. Similar attempts at DSA administration have been made recently in xenotransplantation models, but, contrary to the outcome in allogenic models, these resulted in increased sensitivity against, not tolerance to, donor organs. As has been demonstrated repeatedly, the response of the immune system varies according to the antigen administration route. The immune response to antigen administered via the portal vein or oral route is less vigorous than that resulting from the systemic venous route. In order to study xenotolerance, we planned to administer either DCFE or DSCs in a discordant xenotransplant combination. This initial study reports the results of guinea pig-specific DCFE administration to recipient rats without any additional pretreatment. We have chosen DCFE because, as has been suggested, this option is free of the undesirable possibility of graft-vs-host disease and is easier to handle and obtain than DSCs." @default.
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- W2022681912 date "1998-05-01" @default.
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- W2022681912 title "Effects of Various Routes of Donor-Specific Antigen Administration on Graft Survival in a Model of Discordant Heart Xenotransplantation" @default.
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- W2022681912 doi "https://doi.org/10.1016/s0041-1345(98)00058-x" @default.
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