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• W2947535260 abstract "Multipotent self-renewing haematopoietic stem cells (HSCs) regenerate the adult blood system after transplantation1, which is a curative therapy for numerous diseases including immunodeficiencies and leukaemias2. Although substantial effort has been applied to identifying HSC maintenance factors through the characterization of the in vivo bone-marrow HSC microenvironment or niche3–5, stable ex vivo HSC expansion has previously been unattainable6,7. Here we describe the development of a defined, albumin-free culture system that supports the long-term ex vivo expansion of functional mouse HSCs. We used a systematic optimization approach, and found that high levels of thrombopoietin synergize with low levels of stem-cell factor and fibronectin to sustain HSC self-renewal. Serum albumin has long been recognized as a major source of biological contaminants in HSC cultures8; we identify polyvinyl alcohol as a functionally superior replacement for serum albumin that is compatible with good manufacturing practice. These conditions afford between 236- and 899-fold expansions of functional HSCs over 1 month, although analysis of clonally derived cultures suggests that there is considerable heterogeneity in the self-renewal capacity of HSCs ex vivo. Using this system, HSC cultures that are derived from only 50 cells robustly engraft in recipient mice without the normal requirement for toxic pre-conditioning (for example, radiation), which may be relevant for HSC transplantation in humans. These findings therefore have important implications for both basic HSC research and clinical haematology. An albumin-free culture system for the long-term ex vivo expansion of mouse haematopoietic stem cells produces 236- to 899-fold expansion, and generates cultures that robustly engraft in recipient mice without toxic pre-conditioning." @default.
• W2947535260 created "2019-06-07" @default.
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• W2947535260 date "2019-05-29" @default.
• W2947535260 modified "2023-10-17" @default.
• W2947535260 title "Long-term ex vivo haematopoietic-stem-cell expansion allows nonconditioned transplantation" @default.
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• W2947535260 doi "https://doi.org/10.1038/s41586-019-1244-x" @default.
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