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• W1997624076 abstract "ABSTRACT Members of the mitogen-activated protein kinase (MAPK) family, including Jun amino-terminal kinase (JNK) and extracellular signal-related kinase (ERK), play an important role in the proliferation of erythroid cells in response to erythropoietin (Epo). Erythroid cells infected with the Friend spleen focus-forming virus (SFFV) proliferate in the absence of Epo and show constitutive activation of Epo signal transduction pathways. We previously demonstrated that the ERK pathway was constitutively activated in Friend SFFV-infected erythroid cells, and in this study JNK is also shown to be constitutively activated. Pharmacological inhibitors of both the ERK and JNK pathways stopped the proliferation of primary erythroleukemic cells from Friend SFFV-infected mice, with little induction of apoptosis, and furthermore blocked their ability to form Epo-independent colonies. However, only the JNK inhibitor blocked the proliferation of erythroleukemia cell lines derived from these mice. The JNK inhibitor caused significant apoptosis in these cell lines as well as an increase in the fraction of cells in G 2 /M and undergoing endoreduplication. In contrast, the growth of erythroleukemia cell lines derived from Friend murine leukemia virus (MuLV)-infected mice was inhibited by both the MEK and JNK inhibitors. JNK is important for AP1 activity, and we found that JNK inhibitor treatment reduced AP1 DNA-binding activity in primary erythroleukemic splenocytes from Friend SFFV-infected mice and in erythroleukemia cell lines from Friend MuLV-infected mice but did not alter AP1 DNA binding in erythroleukemia cell lines from Friend SFFV-infected mice. These data suggest that JNK plays an important role in cell proliferation and/or the survival of erythroleukemia cells." @default.
• W1997624076 created "2016-06-24" @default.
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• W1997624076 date "2005-10-15" @default.
• W1997624076 modified "2023-10-17" @default.
• W1997624076 title "Activation of the Jun N-Terminal Kinase Pathway by Friend Spleen Focus-Forming Virus and Its Role in the Growth and Survival of Friend Virus-Induced Erythroleukemia Cells" @default.
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• W1997624076 doi "https://doi.org/10.1128/jvi.79.20.12752-12762.2005" @default.
• W1997624076 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1235824" @default.
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