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Evrard, Solene M; Lecce, Laura; Michelis, Katherine C; Nomura-Kitabayashi, Aya; Pandey, Gaurav; Purushothaman, K-Raman; d'Escamard, Valentina; Li, Jennifer R; Hadri, Lahouaria; Fujitani, Kenji; Moreno, Pedro R; Benard, Ludovic; Rimmele, Pauline; Cohain, Ariella; Mecham, Brigham; Randolph, Gwendalyn J; Nabel, Elizabeth G; Hajjar, Roger; Fuster, Valentin; Boehm, Manfred; Kovacic, Jason C
Nature communications, 06/2016, Letnik: 7, Številka: 1Journal Article
Endothelial to mesenchymal transition (EndMT) plays a major role during development, and also contributes to several adult cardiovascular diseases. Importantly, mesenchymal cells including fibroblasts are prominent in atherosclerosis, with key functions including regulation of: inflammation, matrix and collagen production, and plaque structural integrity. However, little is known about the origins of atherosclerosis-associated fibroblasts. Here we show using endothelial-specific lineage-tracking that EndMT-derived fibroblast-like cells are common in atherosclerotic lesions, with EndMT-derived cells expressing a range of fibroblast-specific markers. In vitro modelling confirms that EndMT is driven by TGF-β signalling, oxidative stress and hypoxia; all hallmarks of atherosclerosis. 'Transitioning' cells are readily detected in human plaques co-expressing endothelial and fibroblast/mesenchymal proteins, indicative of EndMT. The extent of EndMT correlates with an unstable plaque phenotype, which appears driven by altered collagen-MMP production in EndMT-derived cells. We conclude that EndMT contributes to atherosclerotic patho-biology and is associated with complex plaques that may be related to clinical events.
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