Following orthotopic transplantation of hDAF-transgenic pig hearts into baboons, GAS914 is able to maintain a sufficient reduction of Galalpha(1,3)Gal-specific cytotoxicity to the graft. GAS914 therefore is able to prevent not only hyperacute rejection, but also acute vascular rejection at its beginning, when serum cytotoxicity to the pig heart appears to be predominantly Galalpha(1,3)Gal-specific. A sustained prevention of acute vascular rejection, however, still requires the identification of antibody specificities other than to Galalpha(1,3)Gal.
Our results demonstrate that in the early phase after orthotopic transplantation of hDAF pig hearts to baboons, cardiac function of the donor heart is maintained and exceeds baseline CO. However, in the early intraoperative phase this was only possible by using inotropic substances and vasopressors due to the inevitable blood loss and dilution by the priming of the bypass circuit.
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