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- W2150376368 abstract "In situ analysis of fetal semilunar valve leaflets has revealed cells coexpressing endothelial and mesenchymal markers along the endothelium, with diminished frequency seen in adult valves. To determine whether such cells are progenitor cells, we isolated clonal populations from human pulmonary valves. The clones expressed endothelial markers but showed potential to further differentiate into endothelium in response to vascular endothelial growth factor (VEGF)-A. When exposed to transforming growth factor (TGF)-β 2 , individual clones adopted a mesenchymal phenotype to varying degrees and expressed markers of endothelial to mesenchymal transformation (EMT). Both VEGF- and TGFβ 2 –induced phenotypic changes were partially reversible, indicating the plasticity of these cells. When challenged with VEGF or TGFβ 2 , a hierarchy of endothelial/mesenchymal potential could be seen among the clonal populations: cells initially closer to an endothelial phenotype showed a strong response to TGFβ 2 that could be inhibited by VEGF, whereas cells closer to a mesenchymal phenotype responded to TGFβ 2 but were resistant to endothelial-inducing effects of VEGF. These findings suggest the presence of bipotential valve progenitor cells with ability to differentiate into either endothelial or interstitial cells of the valve leaflet. Understanding the differentiation potential and function of these cells may be important for understanding heart valve disease and may also be applied to current paradigms for creating tissue-engineered heart valves." @default.
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- W2150376368 date "2006-10-13" @default.
- W2150376368 modified "2023-09-30" @default.
- W2150376368 title "Human Pulmonary Valve Progenitor Cells Exhibit Endothelial/Mesenchymal Plasticity in Response to Vascular Endothelial Growth Factor-A and Transforming Growth Factor-β <sub>2</sub>" @default.
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- W2150376368 doi "https://doi.org/10.1161/01.res.0000245188.41002.2c" @default.
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