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Cell Therapy pp 105-106 | Cite as

Ex Vivo Expansion of Human Hematopoietic Stem Cells

  • Tatsutoshi Nakahata
  • Ming-Jiang Xu
  • Takahiro Ueda
  • Sahoko Matsuoka
  • Mamoru Ito
  • Kohichiro Tsuji
Conference paper
Part of the Keio University Symposia for Life Science and Medicine book series (KEIO, volume 5)

Abstract

Recent progress of embryology has provided significant insight into hematopoietic stem cell biology. There has been great interest in the ex vivo expansion of human hemopoietic stem/progenitor cells for a variety of clinical applications. I present a novel approach using soluble interleukin-6 receptor (sIL-6R) for ex vivo expansion of human hemopoietic stem/progenitor cells. Our FACS analysis revealed that most immature progenitor cells such as CFU-Mix and LTCIC were included in the CD34+gp130+IL-6R population, suggesting that sIL-6R/IL-6 but not IL-6 may be potent for the ex vivo expansion of immature human progenitor cells. sIL-6R/IL-6 dramatically stimulated expansion of various progenitors including CFU-GEMM and CFU-Blast as well as CD34+ cells in the presence of stem cell factor (SCF) or flt3/flk-2 ligand (FL). A combination of sIL-6R/IL-6 and SCF expanded CFU-Mix approximately 68 fold in serum-free culture by day 14. More than 100-fold expansion of total and multipotential progenitors was obtained from CD34+IL-6R cells but not from CD34+IL-6R+ cells in culture with sIL-6/IL6/SCF. Addition of thrombopoietin (TPO) to culture with sIL-6R/IL-6/SCF or sIL-6/IL-6/FL significantly enhanced the expansion of immature progenitor cells. These findings suggest that gp130 in combination with Kit or flk-2/flt3 signalings may be potent for ex vivo expansion of human hematopoietic stem/progenitor cells.

Keywords

Hematopoietic Stem Cell Reverse Transcription Polymerase Chain Reaction Leukemia Inhibitory Factor Stem Cell Factor Multipotential Progenitor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer-Verlag Tokyo 2000

Authors and Affiliations

  • Tatsutoshi Nakahata
    • 1
  • Ming-Jiang Xu
    • 1
  • Takahiro Ueda
    • 1
  • Sahoko Matsuoka
    • 1
  • Mamoru Ito
    • 1
  • Kohichiro Tsuji
    • 1
  1. 1.Department of Clinical Oncology, Institute of Medical ScienceUniversity of TokyoMinato-ku, TokyoJapan

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