期刊
DEVELOPMENTAL BIOLOGY
卷 404, 期 1, 页码 40-54出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ydbio.2015.04.016
关键词
Myocardium; Endoderm; Mechanics; Modeling
资金
- NIH [HL085694, HL087136 GM102801]
- Hungarian Development Agency [KTIA AIK 12-1-2013-0041]
- G. Harold & Leila Y. Mathers Charitable Foundation
- American Heart Association [11PRE7580033]
- COBRE award [P20 RR024214]
Formation of the muscular layer of the heart, the myocardium, involves the medial movement of bilateral progenitor fields; driven primarily by shortening of the endoderm during foregut formation. Using a combination of time-lapse imaging, microsurgical perturbations and computational modeling, we show that the speed of the medial-ward movement of the myocardial progenitors is similar, but not identical to that of the adjacent endoderm. Further, the extracellular matrix microenvironment separating the two germ layers also moves with the myocardium, indicating that collective tissue motion and not cell migration drives tubular heart assembly. Importantly, as myocardial cells approach the midline, they perform distinct anterior-directed movements relative to the endoderm. Based on the analysis of microincision experiments and computational models, we propose two characteristic, autonomous morphogenetic activities within the early myocardium: 1) an active contraction of the medial portion of the heart field and 2) curling- the tendency of the unconstrained myocardial tissue to form a spherical surface with a concave ventral side. In the intact embryo, these deformations are constrained by the endoderm and the adjacent mesoderm, nevertheless the corresponding mechanical stresses contribute to the proper positioning of myocardial primordia. (C) 2015 Elsevier Inc. All rights reserved.
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