Measurement of junctional tension in epithelial cells at the onset of primitive streak formation in the chick embryo via non-destructive optical manipulation

Measurement of junctional tension in epithelial cells at the onset of primitive streak formation in the chick embryo via non-destructive optical manipulation
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通过非破坏性光学操作测量鸡胚原始条纹形成开始时上皮细胞的连接张力

DOI:
10.1101/501775
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Ferro V
Ferro V
中科院分区:
--
文献类型:
--
作者:
Ferro V

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在原肠胚形成过程中上皮细胞的定向细胞嵌入,在几种生物中,已被证明与肌动蛋白-肌球蛋白细胞骨架组织中的平面细胞极性相关,并被假定为反映驱动定向细胞嵌入的定向张力。我们的特点和应用最近推出的非破坏性的光学操作技术来测量单个上皮细胞连接的细胞在不同的位置和方向在鸡胚的上胚层在原始条纹形成的早期阶段的张力。中内胚层前体在上胚层中的连接张力在插入方向上取向的连接中比在垂直于插入方向取向的连接中更高,并且比在上胚层中的其他细胞的连接中更高。动力学数据最适合一个简单的粘弹性麦克斯韦模型,我们发现,交界处的张力,并在较小程度上粘弹性松弛时间,依赖于肌球蛋白的活动。
Directional cell intercalations of epithelial cells during gastrulation has, in several organisms, been shown to be associated with a planar cell polarity in the organisation of the actin-myosin cytoskeleton and is postulated to reflect directional tension that drives oriented cell intercalations. We have characterised and applied a recently introduced non-destructive optical manipulation technique to measure the tension in individual epithelial cell junctions of cells in various locations and orientations in the epiblast of chick embryos in the early stages of primitive streak formation. Junctional tension of mesendoderm precursors in the epiblast is higher in junctions oriented in the direction of intercalation than in junctions oriented perpendicular to the direction of intercalation and higher than in junctions of other cells in the epiblast. The kinetic data fit best with a simple viscoelastic Maxwell model, and we find that junctional tension, and to a lesser extent viscoelastic relaxation time, are dependent on myosin activity.
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