The interplay of stiffness and force anisotropies drive embryo elongation

The interplay of stiffness and force anisotropies drive embryo elongation
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刚度和力各向异性的相互作用驱动胚胎伸长

DOI:
10.1101/095752
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发表时间:
2016
期刊:
bioRxiv
影响因子:
--
通讯作者:
M. Labouesse
M. Labouesse
中科院分区:
--
文献类型:
--
作者:
T. Vuong;M. Ben Amar;Julien Pontabry;M. Labouesse

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组织的形态发生,就像物体的变形一样,是它们的材料特性和施加在它们身上的机械力相互作用的结果。虽然机械力在影响细胞行为方面的重要性得到了广泛的认识,但组织材料特性的重要性,特别是硬度,却没有得到太多的关注。以线虫为模型,我们研究了这两个方面是如何促进胚胎伸长的。通过测量激光纳米消融后表皮肌动蛋白皮质的开放形状,我们评估了肌动球蛋白依赖力和僵硬度在前后轴和背腹轴上的时空变化。实验数据和分析模型表明,外侧表皮内肌球蛋白II依赖力的各向异性和纤维增强的背腹表皮内的硬度各向异性是驱动胚胎伸长的关键。总之,我们的结果在皮质张力、材料特性和整个胚胎的形态发生之间建立了定量联系。
The morphogenesis of tissues, like the deformation of an object, results from the interplay between their material properties and the mechanical forces exerted on them. Whereas the importance of mechanical forces in influencing cell behaviour is widely recognized, the importance of tissue material properties, in particular stiffness, has received much less attention. Using C. elegans as a model, we examine how both aspects contribute to embryonic elongation. Measuring the opening shape of the epidermal actin cortex after laser nano-ablation, we assess the spatiotemporal changes of actomyosin-dependent force and stiffness along the antero-posterior and dorso-ventral axis. Experimental data and analytical modelling show that myosin II-dependent force anisotropy within the lateral epidermis, and stiffness anisotropy within the fiber-reinforced dorso-ventral epidermis are critical to drive embryonic elongation. Together, our results establish a quantitative link between cortical tension, material properties and morphogenesis of an entire embryo.
DOI: 10.1126/science.1224143
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期刊: SCIENCE
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