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Updated: Jun 21, 2026
Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells
Published on: February 21, 2018
Ectopic expression of C/EBPalpha and ID1 is sufficient to restore defective neutrophil development in low-risk
Christian R Geest1, Miranda Buitenhuis, Edo Vellenga
1Department of Immunology, University Medical Center, Utrecht, The Netherlands.
Background:
In patients with myelodysplasia, a general defect in the multipotent stem-cell compartment results in disturbed proliferation and differentiation of the erythroid, megakaryocytic and myeloid lineages. Although a number of genetic defects in myelodysplastic progenitor cells have been described, the intracellular signaling pathways underlying aberrant regulation of myelopoiesis remain relatively undefined.
Design And Methods:
Here, an ex vivo differentiation system was used to selectively screen for molecules improving defective hematopoiesis in myelodysplastic CD34(+) progenitor cells.
Results:
Bone marrow-derived CD34(+) cells isolated from patients with low-risk myelodysplastic syndrome showed impaired capacity to proliferate and differentiate as well as increased levels of apoptosis. In an attempt to improve the expansion and differentiation of the myelodysplastic CD34(+) progenitors, cells were treated with the p38MAPK pharmacological inhibitor SB203580, or retrovirally transduced to ectopically express active protein kinase B (PKB/c-akt), or the transcriptional regulators STAT5, C/EBPalpha or ID1. Whereas treatment of progenitors with SB203580, PKB or STAT5 did not enhance neutrophil development, ID1- and C/EBPalpha-transduced cells exhibited increased granulocyte/macrophage colony formation. Furthermore, ectopic expression of C/EBPalpha resulted in improved neutrophil maturation.
Conclusions:
These data suggest that targeting the ID1 and C/EBPalpha transcriptional regulators may be of benefit in the design of novel therapies for low-risk myelodysplasia.
