Abstract
Infusion of ex vivo expanded megakaryocytic (MK) progenitor cells is a strategy for shortening the duration of thrombocytopenia after haematopoietic stem cell transplantation. The cell dose after expansion has emerged as a critical factor for achieving the desired clinical outcomes. This study aimed to establish efficient conditions for the expansion of the MK lineage from enriched CD34+ cells of umbilical cord blood and to investigate the effect of platelet-derived growth factor (PDGF) in this system. Our results demonstrated that thrombopoietin (TPO) alone produced a high proportion of CD61+CD41+ cells but a low total cell count and high cell death, resulting in an inferior expansion. The addition of interleukin-1β (IL-1β), Flt-3 ligand (Flt-3L) and to a lesser extent IL-3 improved the expansion outcome. The treatment groups with three to five cytokines produced efficient expansions of CFU-MK up to 400-fold with the highest yield observed in the presence of TPO, IL-1β, IL-3, IL-6 and Flt-3L. CD34+ cells were expanded by five to 22-fold. PDGF improved the expansion of all cell types with CD61+CD41+ cells, CFU-MK and CD34+ cells increased by 101%, 134% and 70%, respectively. On day 14, the CD61+ population consisted of diploid (86.5%), tetraploid (11.8%) and polyploid (8N–32N; 1.69%) cells. Their levels were not affected by PDGF. TPO, IL-1β, IL-3, IL-6, Flt-3L and PDGF represented an effective cytokine combination for expanding MK progenitors while maintaining a moderate increase of CD34+ cells. This study showed, for the first time, that PDGF enhanced the ex vivo expansion of the MK lineage, without promoting their in vitro maturation. PDGF might be a suitable growth factor to improve the ex vivo expansion of MK progenitors for clinical applications. Bone Marrow Transplantation (2001) 27, 1075–1080.
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Acknowledgements
We thank Ms Cecilia Mei Yan Chui and nurses of the Labor Ward for cord blood collection and the Industrial Support Fund AF/203/98 (Industry Department, the Government of the Hong Kong Special Administrative Region) for financial support.
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Su, R., Li, K., Yang, M. et al. Platelet-derived growth factor enhances ex vivo expansion of megakaryocytic progenitors from human cord blood. Bone Marrow Transplant 27, 1075–1080 (2001). https://doi.org/10.1038/sj.bmt.1703042
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DOI: https://doi.org/10.1038/sj.bmt.1703042
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