Abstract
The development of ex vivo expansion of hematopoietic stem cells (HSCs) is a promising approach to restore the required bone marrow function of patients with hematological disorders. Previously, we have reported the development of an optimized serum-free and cytokines-limited defined medium using statistic methodology for umbilical cord blood-derived HSC expansion. The aim of this study was to analyze further the characteristics and functions of cells in vitro and in vivo when cultured in this defined medium. After a 7-day batch culture, the average absolute fold expansions for CD133(+) cells, CD34(+)CD133(+) cells, CD34(+)CD38() cells, CD133(+)CD38(-) cells, CD34(+)CXCR4(+) cells, CD133(+)CXCR4(+) cells, and long-term culture-initiating cells were 21-, 20-, 723-, 618-, 160-, 384-, and 8-fold, respectively. The high enrichment of CD38(-) cells and CXCR4(+) cells of the CD34(+) subpopulation provided a very early uncommitted HSC proliferation and homing ability. Furthermore, the expanded cells showed a high level of telomerase activity to maintain their telomere length and repopulated the lethally irradiated NOD/SCID mice in vivo. These results indicated that the cytokines limited expanded cells from CD133(+) cells could substan...Continue Reading
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