Image based modeling of bleb site selection.

Image based modeling of bleb site selection.
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基于图像的BLEB站点选择的建模。

DOI:
10.1038/s41598-017-06875-9
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发表时间:
2017-07-27
期刊:
影响因子:
4.6
通讯作者:
Bretschneider T
Bretschneider T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Collier S;Paschke P;Kay RR;Bretschneider T

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细胞通常利用快速的、压力驱动的水泡来穿过组织或抵抗机械阻力,但是如何选择水泡部位并将其引导到细胞前部仍然是一个悬而未决的问题。以前,我们发现,趋化Dictyosteoblasts细胞优先水泡从凹区,膜张力促进膜皮质脱离。现在,通过一种基于实际细胞轮廓的新建模方法,我们使用细胞几何形状来预测迁移细胞中气泡的形成位置。我们发现,细胞的几何形状本身,并暗示,在膜中的物理力,是足以预测的位置气泡在圆形细胞移动在一个高电阻的环境。该模型是不太成功的,更多的极化细胞对抗更小的阻力,但可以大大改善,通过在膜-皮层粘附的前到后梯度。与这一预测雅阁,我们发现连接膜和皮层的塔林形成了这样一个前后梯度。因此,我们的模型提供了一种方法,解剖出物理力的作用,在控制水泡的形成,并表明,在某些情况下,他们可能是主要的决定因素。
Cells often employ fast, pressure-driven blebs to move through tissues or against mechanical resistance, but how bleb sites are selected and directed to the cell front remains an open question. Previously, we found that chemotaxing Dictyostelium cells preferentially bleb from concave regions, where membrane tension facilitates membrane-cortex detachment. Now, through a novel modeling approach based on actual cell contours, we use cell geometry to predict where blebs will form in migrating cells. We find that cell geometry alone, and by implication, physical forces in the membrane, is sufficient to predict the location of blebs in rounded cells moving in a highly resistive environment. The model is less successful with more polarized cells moving against less resistance, but can be greatly improved by positing a front-to-back gradient in membrane-cortex adhesion. In accord with this prediction, we find that Talin, which links membrane and cortex, forms such a front-to-back gradient. Thus our model provides a means of dissecting out the role of physical forces in controlling where blebs form, and shows that in certain circumstances they could be the major determining factor.
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期刊: The Journal of cell biology
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