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Transient engraftment of T cell-depleted allogeneic bone marrow in mice improves survival rate following lethal irradiation.

C3H/HeJ mice were exposed to 8 or 9 Gy total body irradiation prior to transplantation of 1-15 x 10(6) H-2 incompatible T cell-depleted bone marrow cells from C57BL/6 donors. Survival was greatly enhanced compared to irradiated controls, even at the lowest cell doses. Analysis of spleen cells 1-7 weeks post-transplant revealed that recipients of the lowest doses of T cell-depleted bone marrow had only transient engraftment of donor type cells, and that long-term recovery was autologous. This transient engraftment had a marked beneficial effect both on reconstitution of hematopoiesis and on survival.