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Sensitivity of murine multipotential stem cell colony (CFU-GEMM) growth to interleukin-3, erythropoietin, and hemin
The in vitro growth of murine marrow-derived CFU-GEMM in response to partially purified preparations of interleukin-3 and erythropoietin was assessed in the presence of hemin. Although CFU-GEMM exhibited a near-absolute requirement for interleukin-3, some colony growth was observed in the absence of exogenous erythropoietin. Erythropoietin was nevertheless capable of further stimulating CFU-GEMM growth in the presence of optimal concentrations of interleukin-3 and hemin. Optimal concentrations of all three factors allowed at least a 60% reduction in the serum concentration without an effect on colony numbers or their detection efficiency. Furthermore, nearly half the colonies continued to grow without the addition of serum, suggesting that hemin supplementation, along with interleukin-3 and erythropoietin, may provide the basis for a relatively simple serum-free culture system for murine CFU-GEMM.
The in vitro growth of murine marrow-derived CFU-GEMM in response to partially purified preparations of interleukin-3 and erythropoietin was assessed in the presence of hemin. Although CFU-GEMM exhibited a near-absolute requirement for interleukin-3, some colony growth was observed in the absence of exogenous erythropoietin. Erythropoietin was nevertheless capable of further stimulating CFU-GEMM growth in the presence of optimal concentrations of interleukin-3 and hemin. Optimal concentrations of all three factors allowed at least a 60% reduction in the serum concentration without an effect on colony numbers or their detection efficiency. Furthermore, nearly half the colonies continued to grow without the addition of serum, suggesting that hemin supplementation, along with interleukin-3 and erythropoietin, may provide the basis for a relatively simple serum-free culture system for murine CFU-GEMM.