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  • Vargel, Oezge, et al. (författare)
  • Activation of the TGF beta pathway impairs endothelial to haematopoietic transition
  • 2016
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 6
  • Tidskriftsartikel (refereegranskat)abstract
    • The endothelial to haematopoietic transition (EHT) is a key developmental process where a drastic change of endothelial cell morphology leads to the formation of blood stem and progenitor cells during embryogenesis. As TGF beta signalling triggers a similar event during embryonic development called epithelial to mesenchymal transition (EMT), we hypothesised that TGF beta activity could play a similar role in EHT as well. We used the mouse embryonic stem cell differentiation system for in vitro recapitulation of EHT and performed gain and loss of function analyses of the TGF beta pathway. Quantitative proteomics analysis showed that TGF beta treatment during EHT increased the secretion of several proteins linked to the vascular lineage. Live cell imaging showed that TGF beta blocked the formation of round blood cells. Using gene expression profiling we demonstrated that the TGF beta signalling activation decreased haematopoietic genes expression and increased the transcription of endothelial and extracellular matrix genes as well as EMT markers. Finally we found that the expression of the transcription factor Sox17 was up-regulated upon TGF beta signalling activation and showed that its overexpression was enough to block blood cell formation. In conclusion we showed that triggering the TGF beta pathway does not enhance EHT as we hypothesised but instead impairs it.
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