@article{DietrichLombardoAbdelilahSeyfried2014, author = {Dietrich, Ann-Christin and Lombardo, Veronica A. and Abdelilah-Seyfried, Salim}, title = {Blood flow and Bmp signaling control endocardial chamber morphogenesis}, series = {Developmental cell}, volume = {30}, journal = {Developmental cell}, number = {4}, publisher = {Cell Press}, address = {Cambridge}, issn = {1534-5807}, doi = {10.1016/j.devcel.2014.06.020}, pages = {367 -- 377}, year = {2014}, abstract = {During heart development, the onset of heartbeat and blood flow coincides with a ballooning of the cardiac chambers. Here, we have used the zebrafish as a vertebrate model to characterize chamber ballooning morphogenesis of the endocardium, a specialized population of endothelial cells that line the interior of the heart. By combining functional manipulations, fate mapping studies, and high-resolution imaging, we show that endocardial growth occurs without an influx of external cells. Instead, endocardial cell proliferation is regulated, both by blood flow and by Bmp signaling, in a manner independent of vascular endothelial growth factor (VEGF) signaling. Similar to myocardial cells, endocardial cells obtain distinct chamber-specific and inner- versus outer-curvature-specific surface area sizes. We find that the hemodynamic-sensitive transcription factor Klf2a is involved in regulating endocardial cell morphology. These findings establish the endocardium as the flow-sensitive tissue in the heart with a key role in adapting chamber growth in response to the mechanical stimulus of blood flow.}, language = {en} }