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- W1525566734 abstract "Abstract The gp55 envelope proteins of the spleen focus-forming virus initiate erythroleukemia in adult mice. Because the gp55 from the polycythemic strain (gp55-P), but not from the anemic strain (gp55-A), activates the erythropoietin receptor (EpoR) for proliferation of hematopoietic cell lines, the mechanism by which gp55-A initiates erythroleukemia has remained a mystery. We show here that gp55-A activates the EpoR in fetal liver cells. In contrast to previous studies using bone marrow cells from phenylhydrazine-treated, anemic mice, we find that both gp55-A and gp55-P induce erythroid differentiation from colony-forming unit-erythroid (CFU-E) progenitors in fetal liver cells. The effects on CFU-Es of both gp55-A and -P are mediated by the EpoR, because no colonies are seen upon expression of either gp55 in EpoR−/− fetal liver cells. However, only gp55-P induces erythroid bursts from burst-forming unit-erythroid progenitors and only gp55-P induces Epo independence in Epo-dependent cell lines. Using chimeric gp55 P/A proteins, we extend earlier work showing that the transmembrane sequence determines the capacity of gp55 proteins to differentially activate EpoR signaling. We discuss the possibilities for different signaling capacities of gp55-A and -P in fetal liver and bone marrow-derived erythroid progenitor cells." @default.
- W1525566734 created "2016-06-24" @default.
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- W1525566734 date "1998-02-15" @default.
- W1525566734 modified "2023-10-13" @default.
- W1525566734 title "The Anemic Friend Virus gp55 Envelope Protein Induces Erythroid Differentiation in Fetal Liver Colony-Forming Units-Erythroid" @default.
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- W1525566734 doi "https://doi.org/10.1182/blood.v91.4.1163" @default.
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