Abstract
Late graft rejection after conditioning with 1 Gy of total body irradiation (TBI) was consistently seen in historical dogs given two postgrafting immunosuppressive drugs. Here, 16 dogs were given four different three-drug combinations of cyclosporine, mycophenolate mofetil, sirolimus, or methotrexate after 1 Gy TBI and dog leukocyte antigen-identical marrow grafts. In addition, we assessed the effects of TBI doses of 0.5, 1.0, 2.0, or 3.0 Gy, respectively, on immune functions in six dogs not given marrow grafts. All dogs showed initial engraftment, 13 rejected, and three had sustained grafts beyond 26 weeks. The dogs with durable grafts had received greater median numbers of nucleated marrow cells compared with the 13 dogs that rejected their grafts (6.14 vs. 3.6 x 10(8) per kg; P=0.03). In a Cox proportional hazard model, which included data from 16 historical dogs, each increase in transplanted marrow cell numbers by 1 x 10(8) per kg decreased the hazard ratio of rejection by 0.5. Decreasing percents of remaining CD3, CD4, and CD8 cells in peripheral blood and lymph nodes were observed with increasing TBI doses. Further, greater suppressions of B-cell- and T-cell-dependent production of IgM and IgG antibodies in response to s...Continue Reading
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