Activation of Stat 5b in erythroid progenitors correlates with the ability of ErbB to induce sustained cell proliferation.
AUTOR(ES)
Mellitzer, G
RESUMO
Self renewal of normal erythroid progenitors is induced by the receptor tyrosine kinase c-ErbB, whereas other receptors (c-Kit/Epo-R) regulate erythroid differentiation. To address possible mechanisms that could explain this selective activity of c-ErbB, we analyzed the ability of these receptors to activate the different members of the Stat transcription factor family. Ligand activation of c-ErbB induced the tyrosine phosphorylation, DNA-binding, and reporter gene transcription of Stat 5b in erythroblasts. In contrast, ligand activation of c-Kit was unable to induce any of these effects in the same cells. Activation of the erythropoietin receptor caused specific DNA-binding of Stat 5b, but failed to induce reporter gene transcription. These biochemical findings correlate perfectly with the selective ability of c-ErbB to cause sustained self renewal in erythroid progenitors.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=38474Documentos Relacionados
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