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

Attila Kolonics, Ágota Apáti, Judit Jánossy, Anna Brózik, Róbert Gáti, András Schaefer, Mária Magócsi

Research output: Contribution to journalArticle

42 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)743-754
Number of pages12
JournalCellular Signalling
Volume13
Issue number10
DOIs
Publication statusPublished - Sep 11 2001

Keywords

  • Apoptosis
  • Cell proliferation
  • Differentiation
  • ERKs
  • Erythropoietin
  • GM-CSF
  • Signal transduction
  • TF-1 cells
  • Transcription factors

ASJC Scopus subject areas

  • Cell Biology

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