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Actomyosin dynamics, Bmp and Notch signaling pathways drive apical extrusion of proepicardial cells

By Laura Andrés-Delgado, Alexander Ernst, María Galardi-Castilla, David Bazaga, Marina Peralta Lopez, Juliane Munch, Juan Manuel González-Rosa, Federico Tessadori, Jeroen Bakkers, Jose Luis De La Pompa Minguez, Julien Vermot, Nadia Mercader

Posted 28 May 2018
bioRxiv DOI: 10.1101/332593

The epicardium, the outer mesothelial layer enclosing the myocardium, plays key roles in heart development and regeneration. During embryogenesis it arises from the proepicardium (PE), a cell cluster that appears in the dorsal pericardium close to the venous pole of the heart. Little is known about how the PE emerges from the pericardial mesothelium. Using the zebrafish model and a combination of genetic tools, pharmacological agents and quantitative in vivo imaging we reveal that a coordinated collective movement of the dorsal pericardium drives PE formation. We found that PE cells are apically extruded in response to actomyosin activity. Our results reveal that the coordinated action of Notch/Bmp pathways is critically needed for apical extrusion of PE cells. More generally, by comparison to cell extrusion for the elimination of unfit cells from epithelia, our results describe a unique mechanism where extruded cell viability is maintained.

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