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- W2056678045 abstract "The involvement of MAPK pathways in differentiation, proliferation and survival was investigated by comparing Epo and GM-CSF signalling in human factor-dependent myeloerythroid TF-1 cells with abnormal Epo-R. GM-CSF withdrawal induced cell-cycle arrest and apoptosis accompanied by increased caspase-3 activity, DNA degradation and reduced expression of the antiapoptotic Bcl-2 and Bcl-xl proteins. Readministration of GM-CSF but not Epo reversed these processes and induced proliferation. The GM-CSF promoted cell survival and proliferation correlated with MEK-1 dependent ERK1/2, Elk-1 and CREB phosphorylation and Egr-1, c-Fos expression as well as with increased STAT-5, AP-1, c-Myb and NF-κB DNA-binding. In contrast, Epo failed to activate the Raf-1/ERK1/2 MAPK pathway or to induce Egr-1 and/or c-Fos expression, while it induced erythroid differentiation in GM-CSF-deprived cells. In addition, the Epo-induced haemoglobin production was inhibited in the presence of GM-CSF. These results demonstrate that the activation of MAPK cascade is not necessary for Epo-induced haemoglobin production in TF-1 cells and suggest a negative cross-talk between the signalling of GM-CSF-stimulated cell proliferation and Epo-induced erythroid differentiation." @default.
- W2056678045 created "2016-06-24" @default.
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- W2056678045 date "2001-10-01" @default.
- W2056678045 modified "2023-10-16" @default.
- W2056678045 title "Activation of Raf/ERK1/2 MAP kinase pathway is involved in GM-CSF-induced proliferation and survival but not in erythropoietin-induced differentiation of TF-1 cells" @default.
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- W2056678045 doi "https://doi.org/10.1016/s0898-6568(01)00201-7" @default.
- W2056678045 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11602185" @default.
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