In vivo immunogenicity of purified allogeneic hepatocytes in a murine hepatocyte transplant model

Transplantation
G L BumgardnerC G Orosz

Abstract

It has been reported previously that liver grafts and liver cells seem to be tolerogenic, based on the high frequency of spontaneous tolerance after orthotopic liver transplantation in rodents and on the phenomenon of portal venous tolerance in other models. The purpose of the current study was to characterize in vivo immune responses to allogeneic hepatocytes transplanted into the portal circulation. In this functional model of hepatocyte transplantation, "donor" hepatocytes from mice transgenic for human alpha1-antitrypsin (hA1AT) were transplanted by intrasplenic injection into host mice and the secreted hA1AT protein measured in host serum to determine hepatocellular graft survival. Host immune responses were assessed by measurement of donor-specific alloantibodies and delayed-type hypersensitivity responses. In some experiments, liver nonparenchymal cells (NPCs) were co-transplanted with the allogeneic hepatocyte transplant. Allogeneic hepatocyte transplant into immunocompetent hosts resulted in loss of host serum hA1AT by days 7-10 after transplant, whereas syngeneic hosts maintained long-term hepatocellular graft survival as reflected by persistence of serum hA1AT for > 20 weeks. Allogeneic hepatocyte transplantation res...Continue Reading

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Citations

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