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As a preclinical step to human studies with combined stem cell-enriched peripheral leukocytes and organ transplantation from the same donor, a series of studies in rats was undertaken. These studies indicated that Lewis rats infused intravenously with major histocompatibility complex-incompatible (from Brown-Norway rats), stem cell-enriched peripheral leukocyte preparation alone never developed graft-versus-host disease (GHVD). However, GVHD invariably manifested in all animals a few days after the kidney was transplanted in rats that had been previously primed with stem cell-enriched peripheral leukocytes from the same kidney donor strain. GVHD was prevented by substituting the crude preparation of stem cell-enriched peripheral leukocytes with a purified preparation that was almost completely free of T lymphocytes. However, in these latter experiments all rats rejected their kidney graft within 10 days from the surgery. In rats previously given the crude stem cell-enriched peripheral leukocyte preparation, perioperative administration of the fusion protein CTLA4lg also prevented GVHD and prolonged kidney graft survival up to 106 to 175 days. By contrast, animals with kidney transplants, which were given CTLA4lg without stem cells, rejected their grafts within 35 days. All together, these findings may possibly contribute to the creation of rationally designed strategies of combining organ and bone marrow from the same donor to enhance mixed chimerism and prolong survival after organ transplantation.

The kidney triggers graft-versus-host disease in experimental combined transplantation of kidney and stem cell-enriched peripheral leukocytes.