THE RECOVERY OF LETHALLY IRRADIATED DOGS GIVEN INFUSIONS OF AUTOLOGOUS LEUKOCYTES PRESERVED AT -80 C.

Nine normal mongrel dogs were exposed to 1200 r whole-body irradiation at 4 to 5 r per minute. They were then given intravenous infusions of 2.12 to 20 x 109 autologous leukocytes that had been previously stored at -80 C. in 10 per cent dimethyl-sulfoxide. Three dogs survived with delayed but complete hematopoietic recovery. Three showed beginning marrow regeneration but died within 3-4 weeks of irradiation. Three given less than 6 x 109 cells died within 21 days. The number of leukocytes infused was critical since there was no survivor among the dogs receiving less than 9 x 109 cells. It is concluded that peripheral blood contains primitive cells capable of repopulating marrow spaces and restoring marrow function.

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