Human growth factor-enhanced regeneration of transplantable human hematopoietic stem cells in nonobese diabetic/severe combined immunodeficient mice.

Self-renewal is considered to be the essential defining property of a stem cell. Retroviral marking, in vitro amplification, and serial transplantation of human cells that can sustain long-term lymphomyelopoiesis in vivo have provided evidence that human hematopoietic stem cell self-renewal occurs both in vitro and in vivo. To investigate whether this process can be manipulated by cytokines, we administered two different combinations of human growth factors to sublethally irradiated nonobese diabetic/severe combined immunodeficient (SCID) mice transplanted with 10(7) light-density human cord blood cells and then performed secondary transplants to compare the number of transplantable human lymphomyeloid reconstituting cells present 4 to 6 weeks post-transplant. A 2-week course of Steel factor + interleukin (IL)-3 + granulocyte-macrophage colony-stimulating factor + erythropoietin (3 times per week just before sacrifice) specifically and significantly enhanced the numbers of transplantable human lymphomyeloid stem cells detectable in the primary mice (by a factor of 10). Steel factor + Flt3-ligand + IL-6 (using either the same schedule or administered daily until sacrifice 4 weeks post-transplant) gave a threefold enhancement of this population. These effects were obtained at a time when the regenerating human progenitor populations in such primary mice are known to be maximally cycling even in the absence of growth factor administration suggesting that the underlying mechanism may reflect an ability of these growth factors to alter the probability of differentiation of stem cells stimulated to proliferate in vivo.

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