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Closely related signals often lead to very different cellularoutcomes. We found that the differentiation of human mesenchymalstem cells into bone-forming cells is stimulated by epidermalgrowth factor (EGF) but not platelet-derived growth factor (PDGF).We used mass spectrometrybased proteomics to comprehensivelycompare proteins that were tyrosine phosphorylated in responseto EGF and PDGF and their associated partners. More than 90%of these signaling proteins were used by both ligands, whereasthe phosphatidylinositol 3-kinase (PI3K) pathway was exclusivelyactivated by PDGF, implicating it as a possible control point.Indeed, chemical inhibition of PI3K in PDGF-stimulated cellsremoved the differential effect of the two growth factors, bestowingfull differentiation effect onto PDGF. Thus, quantitative proteomicscan directly compare entire signaling networks and discovercritical differences capable of changing cell fate.
1 Center for Experimental BioInformatics (CEBI), Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark. 2 Department of Endocrinology, Odense University Hospital, DK-5000 Odense C, Denmark.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: mann{at}bmb.sdu.dk
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