Epidermal growth factor and perlecan fragments produced by apoptotic endothelial cells co-ordinately activate ERK1/2-dependent antiapoptotic pathways in mesenchymal stem cells

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DOIResolve DOI: http://doi.org/10.1002/stem.403
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TypeArticle
Journal titleStem Cells
Volume28
Issue4
Pages810820; # of pages: 11
SubjectApoptosis; bio; Cells; Cells,Cultured; cytology; Endothelial Cells; Epidermal Growth Factor; Heparan Sulfate Proteoglycans; Human; Humans; MAP Kinase Signaling System; Mesenchymal Stem Cells; metabolism; Mitogen-Activated Protein Kinase 1; Mitogen-Activated Protein Kinase 3Phenotype; Protein; Proteoglycans; serum-free medium
AbstractMounting evidence indicates that mesenchymal stem cells (MSC) are pivotal to vascular repair and neointima formation in various forms of vascular disease. Yet, the mechanisms that allow MSC to resist apoptosis at sites where other cell types, such as endothelial cells (EC), are dying are not well defined. In the present work, we demonstrate that apoptotic EC actively release paracrine mediators which, in turn, inhibit apoptosis of MSC. Serum-free medium conditioned by apoptotic EC increases extracellular signal-regulated kinases 1 and 2 (ERK1/2) activation and inhibits apoptosis (evaluated by Bcl-xL protein levels and poly (ADP-ribose) polymerase cleavage) of human MSC. A C-terminal fragment of perlecan (LG3) released by apoptotic EC is one of the mediators activating this antiapoptotic response in MSC. LG3 interacts with beta1-integrins, which triggers downstream ERK1/2 activation in MSC, albeit to a lesser degree than medium conditioned by apoptotic EC. Hence, other mediators released by apoptotic EC are probably required for induction of the full antiapoptotic phenotype in MSC. Adopting a comparative proteomic strategy, we identified epidermal growth factor (EGF) as a novel mediator of the paracrine component of the endothelial apoptotic program. LG3 and EGF cooperate in triggering beta1-integrin and EGF receptor-dependent antiapoptotic signals in MSC centering on ERK1/2 activation. The present work, providing novel insights into the mechanisms facilitating the survival of MSC in a hostile environment, identifies EGF and LG3 released by apoptotic EC as central antiapoptotic mediators involved in this paracrine response
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Biotechnology Research Institute
Peer reviewedYes
NRC number52762
NPARC number16225328
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Record identifier67127574-2316-46c5-9472-2d42414985f9
Record created2010-11-05
Record modified2016-05-09
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