Characterisation of the expression and function of the GM-CSF receptor alpha-chain in mice.
The granulocyte-macrophage colony-stimulating factor (GM-CSF) is a hematopoietic cytokine able to regulate a variety of cell functions including differentiation of macrophages and granulocytes, dendritic cell development and the maintenance of homeostasis. It binds specifically to its receptor, which is composed of a cytokine-specific alpha-chain (GM-CSF receptor alpha-chain, GMRalpha) and a beta-chain shared with the receptors for interleukin-3 and interleukin-5. In this report, we present a comprehensive study of GMRalpha in the mouse. We have found that the mouse GMRalpha is polymorphic and alternatively spliced. In the absence of specific antibodies, we generated a novel chimeric protein containing the Fc fragment of human IgG1 coupled to mouse GM-CSF, which was able to specifically bind to GMRalpha and induce proliferation of GMRalpha-transduced Ba/F3 cells. We used this reagent to perform the first detailed FACS study of the surface expression of mouse GMRalpha by leucocytes. Highest expression was found on monocytes and granulocytes, and variable expression on tissue macrophages. The GM-CSF receptor in mice is specifically expressed by myeloid cells and is useful for the detection of novel uncharacterised myeloid populations. The ability to detect GM-CSF receptor expression in experimental studies should greatly facilitate the analysis of its role in immune pathologies.
Rosas
Marcela
M
Medical Biochemistry and Immunology, Cardiff University School of Medicine, Cardiff, UK.
Gordon
Siamon
S
Taylor
Philip R
PR
D017398:Alternative Splicing / Q000235:genetics; D000818:Animals; D015415:Biomarkers; D002460:Cell Line; D005786:Gene Expression Regulation; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000235:genetics / Q000378:metabolism; D007962:Leukocytes / Q000378:metabolism; D008264:Macrophages / Q000378:metabolism; D051379:Mice; D008957:Models, Genetic; D022423:Myeloid Cells / Q000378:metabolism; D011110:Polymorphism, Genetic / Q000235:genetics; D016187:Receptors, Granulocyte-Macrophage Colony-Stimulating Factor / Q000145:classification* / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism
D015415:Biomarkers; D016187:Receptors, Granulocyte-Macrophage Colony-Stimulating Factor; D011994:Recombinant Proteins; D016178:Granulocyte-Macrophage Colony-Stimulating Factor
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