Abstract
CFU-S differentiation and regeneration kinetics in the spleen and femur was studied after treatment of bone marrow cells with RAMB serum. The effect of thymocytes on the rate of CFU-S regeneration was also investigated. It was found that CFU-S regeneration in the spleen was similar in RAMBS-treated and intact cell populations on days 4-14 after transplantation. On the contrary, the rate of CFU-S regeneration in the femur was slower in RAMBS-treated than in intact bone marrow cells. However, the growth rate in the femur could be restored to the normal level by the administration of freshly isolated syngeneic thymocytes to mice pre-injected with RAMBS-treated CFU-S population. The treatment of bone marrow suspension with RAMB serum did not affect the differentiation of spleen colonies. It is suggested that RAMBS eliminates cell population regulating CFU-S proliferation, without affecting its differentiation.
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