Characterization of serum-free ex vivo-expanded hematopoietic stem cells derived from human umbilical cord blood CD133+ cells

Chao Ling Yao, Yin Hsun Feng, Xi Zhang Lin, I. Ming Chu, Tzu Bou Hsieh, Shiaw Min Hwang

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


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, CB133+CB38- 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 CB38- 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 CB133 + cells could substantially support simultaneous expansion of various stem/progenitor cells and engraft with the expanded cells from a low number of HSCs initially.

Original languageEnglish
Pages (from-to)70-78
Number of pages9
JournalStem Cells and Development
Issue number1
Publication statusPublished - 2006 Feb 1

All Science Journal Classification (ASJC) codes

  • Hematology
  • Developmental Biology
  • Cell Biology


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