Hepatocyte transplantation is an alternative to transplantation of the whole liver. Compared with xenogeneic hepatocytes, primary hepatocytes have some advantages, such as a more powerful function and a smaller frequency of rejection caused by the host. Cell microencapsulation prevents direct access of host cells to the graft but cannot impede transfer of transplant-derived peptides, which can cross the physical barrier. Sertoli cells are central to the immune privilege demonstrated in the testis, and their actions have been utilized to protect cell transplants. Co-microencapsulating Sertoli cells with HepG2 cells has proved to be a valuable strategy in hepatocyte transplantation. Thus mixed microcapsules of primary rat hepatocytes and primary Sertoli cells may improve metabolic function in a d-galactosamine and lipopolysaccharide-induced rat model of acute liver failure.
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