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• W2078585616 endingPage "272" @default.
• W2078585616 startingPage "261" @default.
• W2078585616 abstract "The Bcl-2 family of proteins has been shown to play a central role in the regulation of apoptosis. We have examined the expression of several Bcl-2 homologs upon stimulation of CD34(+) human hematopoietic progenitor cells. CD34(+) cells were induced to differentiate into predominantly erythroid cells in the presence of erythropoietin (Epo) and stem cell factor (SCF), while the addition of G-CSF and SCF led to differentiation predominantly into granulocytic cells, as demonstrated by immunophenotyping and morphological examination of cultured cells. In Epo- and SCF-stimulated cells, we found a marked increase in the level of Bcl-x(L) protein expression and downregulation of Bax expression, apparent from day 4 and more pronounced on days 8 and 21. In contrast, Bcl-x(L) protein expression was downregulated in G-CSF- and SCF-stimulated cells compared with cells cultured in medium alone, whereas there was no sign of change in the level of Bax. Mcl-1 expression showed a biphasic expression pattern in both early erythropoiesis and early granulopoiesis, but with an inverse regulation. Thus, Mcl-1 levels initially decreased in granulocytic progenitor cells and increased in erythroid progenitor cells. Finally, Bcl-2 expression was significantly downregulated in both Epo and SCF and G-CSF- and SCF-stimulated cells. The role of the distinct upregulation of Bcl-x(L) in early erythroid differentiation was further examined by use of specific ribozymes against Bcl-x(L). Addition of Bcl-x(L) ribozymes promoted a clear increase in cell death of Epo- and SCF-stimulated cells, while erythroid differentiation was not affected. In conclusion, we found a distinct regulation of several Bcl-2 family members in CD34(+) cells dependent on the cytokine stimulation given. The use of Bcl-x(L)-specific ribozymes suggested that Bcl-x(L) is important for survival but not for differentiation of erythroid progenitor cells." @default.
• W2078585616 created "2016-06-24" @default.
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• W2078585616 date "2000-07-01" @default.
• W2078585616 modified "2023-10-14" @default.
• W2078585616 title "Differential Expression of Bcl‐2 Homologs in Human CD34 ⁺ Hematopoietic Progenitor Cells Induced to Differentiate into Erythroid or Granulocytic Cells" @default.
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• W2078585616 doi "https://doi.org/10.1634/stemcells.18-4-261" @default.
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