An expansion phase precedes terminal erythroid differentiation of hematopoietic progenitor cells from cord blood in vitro and is associated with up-regulation of cyclin E and cyclin-dependent kinase 2

M. S. Dai, C. R. Mantel, Z. B. Xia, H. E. Broxmeyer, L. Lu

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28 Scopus citations


The dynamics of cell cycle regulation were investigated during in vitro erythroid proliferation and differentiation of CD34+ cord blood cells. An unusual cell cycle profile with a majority of cells in S phase (70.2%) and minority of cells in G1 phase (27.4%) was observed in burst-forming unit-erythrocytes (BFU-E)-derived erythroblasts from a 7-day culture of CD34+ cells stimulated with interleukin 3 (IL-3), granulocyte-macrophage colony-stimulating factor (GM-CSF), Steel factor, and Epo. Terminal erythroid differentiation was accompanied by a rapid increase of G0/G1 phase cells. Expression of cyclin E and cyclin-dependent kinase 2 (cdk2) correlated with the proportion of S phase cells. Cyclin D3 was moderately up-regulated during the proliferation phase, and both cyclin E and D3 were rapidly down-regulated during terminal differentiation. This suggests that the high proliferation potential of erythroblasts is associated with temporal up-regulation of cyclin E and cdk2. (C) 2000 by The American Society of Hematology.

Original languageEnglish (US)
Pages (from-to)3985-3987
Number of pages3
Issue number12
StatePublished - Dec 1 2000


ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology

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