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• W2045776241 abstract "Ex vivo culture and expansion of autologous haemopoietic transplants has been developed to improve tumour cell purging and accelerate haemopoietic reconstitution by transplantation of increased progenitor cell numbers. We studied the effect of the negative haemopoietic regulator, transforming growth factor beta-1 (TGF-beta 1) on primitive precursors during ex vivo expansion of CD34+ cells. When added directly to methylcellulose colony-forming assays, TGF-beta 1 potently suppressed the development of granulocyte-macrophage colonies from CD34+ enriched peripheral blood progenitor cells (80-90% inhibition). In contrast, expansion of total nucleated cells and granulocyte-macrophage colony-forming cells (GM-CFC) from CD34+ progenitors in liquid culture in the presence of stem cell factor (SCF), interleukin (IL)-1 beta, IL-3, IL-6 and erythropoietin (EPO) was inhibited to 32-65% of control culture levels within 14 d when TGF-beta 1 was added, and still produced an average 3.3-fold absolute amplification of GM-CFC. The inhibitory effect of TGF-beta 1 on GM-CFC generation was reversed when it was washed out on day 6 of ex vivo expansion cultures, and total numbers of GM-CFC generated from expansion cultures then reached levels of untreated controls by day 16. Long-term bone marrow culture-initiating cell (LTCIC) numbers were preserved, at least at input levels, over a culture period of 14 d both in control and TGF-beta-1-treated expansion cultures. These findings suggest that TGF-beta 1, a cytokine which induces apoptosis or terminal differentiation in a number of malignant cell types, may be added to ex vivo expansion cultures without loss of primitive cells from autologous haemopoietic transplants." @default.
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• W2045776241 date "1997-12-01" @default.
• W2045776241 modified "2023-09-27" @default.
• W2045776241 title "Transforming growth factor-beta 1 delays formation of granulocyte-macrophage colony-forming cells, but spares more primitive progenitors during ex vivo expansion of CD34+ haemopoietic progenitor cells" @default.
• W2045776241 doi "https://doi.org/10.1046/j.1365-2141.1997.4893291.x" @default.
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