Expansion of Primitive Human Hematopoietic Progenitors in a Perfusion Bioreactor System with IL-3, IL-6, and Stem Cell Factor

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Abstract
Present methods for long-term hematopoietic culture (LTHC) employ a static culture environment which is not well-characterized. Primitive long-term culture-initiating cell (LTC-IC) numbers have been shown to decline in conventional static human LTHC, even with exogenous cytokine combinations. We have expanded human hematopoietic cells from umbilical cord blood on a preformed marrow stroma with synergistic cytokine combinations in a novel perfusion bioreactor system, which continuously maintained culture conditions within desired ranges. Interleukin-3 (IL-3) and interleukin-6 (IL-6) in perfusion culture resulted in rapid 7-day expansion of granulocyte-macrophage colony forming units (CFU-GM, 11-fold), erythroid burst-forming units (BFU-E, 2.5-fold), and granulocyte-erythroid-macrophage colony forming units (CFU-Mix, 2.4-fold), compared to 6-fold, 1.4-fold, and no expansion, respectively, in static cultures. Addition of stem cell factor (SCF) to IL-3/IL-6 in static culture increased the extent of CFU-GM expansion (to 9-fold), but did not result in BFU-E or CFU-Mix expansion. In perfusion cultures with IL-3/IL-6/SCF, much greater expansions of CFU-GM (18-fold) and CFU-Mix (5.3-fold) were obtained. More importantly, expansion of LTC-IC (nearly 3-fold in two of three experiments) was only obtained with IL-3/IL-6/SCF and perfusion. The ability to expand hematopoietic cells while maintaining or expanding primitive progenitors has potential clinical applications in bone marrow transplantation and gene therapy.

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