Abstract
Blood transfusion is indispensable for many clinical applications. However, the supply of transfusable material is insufficient in many countries. Human cord blood contains many hematopoietic stem and progenitor cells, providing a promising resource for the production of transfusable material in vitro. In this study, we have refined a protocol to produce abundant red blood cells (RBC) from human cord blood in an in vitro culture system. We found that erythropoietin and interleukin-3 were most effective when they were added to the culture medium sequentially rather than simultaneously. Although insulin-like growth factor-I (IGF-1) has been reported to function as a positive regulator of RBC production in some in vitro culture systems, we found that IGF-1 had a negative effect upon RBC production. However, IGF-II appeared to function as a positive regulator of RBC production. Finally, stem cell factor functioned to both expand and accelerate the differentiation of immature erythroid cells.
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