Gene expression profile of primary human CD34+CD38lo cells differentiating along the megakaryocyte lineage

Experimental Hematology
Mi-Hyun ShimJo Anna Reems

Abstract

To identify genes involved in megakaryopoiesis, high-density oligonucleotide microarrays were used to compare transcript profiles from undifferentiated CD34+CD38lo cells and culture-derived megakaryocytes (MKs). Megakaryocyte differentiation was achieved in vitro by inducing primary human CD34+CD38lo cells in serum-deprived media supplemented with the cytokine combination of interleukin-3, interleukin-6, stem cell factor, and thrombopoietin for 10 days. Three replicate microarray experiments were performed using hematopoietic cells isolated from three different organ donors and high-density oligonucleotide microarrays. Analysis of gene array data resulted in 304 differentially expressed genes (p < or = 0.001, fold change > or = 3). A third of the 25 most highly up-regulated genes were known to participate in hemostasis (z = 6.75), and no genes known to be associated with MKs were among the down-regulated genes. We also found a large proportion of up-regulated transcripts in gene ontology categories of adhesion and receptor activity (85%) and signal transduction activity (68%). At the same time, 70% of genes within transcription factor functions were down-regulated. Confirmatory studies indicated that the array results correlate...Continue Reading

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