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Type: Journal article
Title: GM-CSF binding to its receptor induces oligomerisation of the common beta-subunit
Author: Mc Clure, B.
Woodcock, J.
Harrison-Findik, D.
Lopez, A.
D'Andrea, R.
Citation: Cytokine, 2001; 13(4):240-243
Publisher: Acadmic Press
Issue Date: 2001
ISSN: 1043-4666
Abstract: The stoichiometry of the granulocyte-macrophage colony-stimulating factor (GM-CSF) receptor complex is still unresolved. We have utilised a sensitive, functional assay for receptor homodimerisation to show that GM-CSF induces dimerisation of the common signalling subunit, hbeta(c). We generated a chimeric cytokine receptor in which the extracellular and transmembrane domains of hbeta(c)are fused to the cytoplasmic domain of erythropoietin receptor (EPO-R). Given that to induce EPO-R activation and mitogenic signalling there is a requirement for formation of a specific homodimeric complex, we reasoned that the cytoplasmic domain of EPO-R could be utilised as a highly sensitive reporter for functional homodimer formation. We show that, in the presence of a cytoplasmically truncated GM-CSF alpha-subunit, the hbetac-EPO receptor chimera transduces a mitogenic signal in BaF-B03 in response to GM-CSF. This is consistent with formation of a hbeta(c)homodimer following GM-CSF binding and implies that ligand stimulation induces formation of a higher order complex that contains the hbeta(c)homodimer.
Keywords: Cell Line
Granulocyte-Macrophage Colony-Stimulating Factor
Receptors, Cell Surface
Receptors, Granulocyte-Macrophage Colony-Stimulating Factor
Recombinant Fusion Proteins
Signal Transduction
Protein Binding
Cytokine Receptor Common beta Subunit
DOI: 10.1006/cyto.2000.0826
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