A semiquantitative PCR technique for detecting chimerism in hamster-to-rat bone marrow xenotransplantation.

Although bone marrow transplantation has been used to induce donor-specific tolerance in many allogeneic models, similar effort in xenogeneic transplantation is met with obstacles like more severe graft versus host disease (GVHD). We are currently engaged in developing a GVHD-free hamster-to-rat xenotransplantation model using splenectomy, total body irradiation, and donor bone marrow transplantation. To test donor cell chimerism, particularly in the solid tissues, we developed a semiquantitative polymerase chain reaction (PCR) method using primers specific for hamster beta-actin and mitochondrial cytochrome C oxidase I and II (MCO I and II) genes and rat sex determination region on the Y chromosome (SRY) gene. Using this method, we estimated the level of hamster cells chimerism in rats subjected to splenectomy, total body irradiation (10 Gy), and hamster bone marrow transplantation (3 x 10(8) cell/recipient) and observed high levels of donor cells in all recipient tissues tested.