Details

Autor(en) / Beteiligte

• CARROLL, M. P
• SPIVAK, J. L
• MCMAHON, M
• WEICH, N
• RAPP, U. R
• STRAFORD MAY, W

Titel

Erythropoietin induces Raf-1 activation and Raf-1 is required for erythropoietin-mediated proliferation

Ist Teil von

• The Journal of biological chemistry, 1991-08, Vol.266 (23), p.14964-14969

Ort / Verlag

Bethesda, MD: American Society for Biochemistry and Molecular Biology

Erscheinungsjahr

1991

Quelle

MEDLINE

Beschreibungen/Notizen

• Erythropoietin mediates the rapid phosphorylation of Raf-1 in the murine cell lines HCD-57 and FDC-P1/ER, which proliferate in response to this cytokine. Phosphorylation occurs at both serine and tyrosine residues and as such is similar to the Raf-1 phosphorylation seen after interleukin-3 (IL-3), granulocyte-macrophage colony-stimulating factor, and interleukin-2 stimulation in other murine cell lines. Such data suggest that these growth factors may share a common mechanism(s) of Raf-1 phosphorylation. Furthermore, in association with Raf-1 phosphorylation, erythropoietin induces a 2-3-fold increase in Raf-1 kinase activity as measured in immune complex kinase assays in vitro. Finally, a c-raf antisense oligodeoxyribonucleotide, which specifically decreases intracellular Raf-1 levels, also substantially inhibits both erythropoietin and IL-3-directed DNA synthesis. Together, these results provide evidence that activated Raf-1 is a necessary component of erythropoietin and IL-3 growth signaling pathways.