Abstract
Epithelial monolayers act as a vital player in a variety of physiological activities, such as wound healing and embryonic development. The mechanical behavior of epithelial monolayers has been increasingly studied with the recent rapid development of techniques. Under dynamic loadings, the creep response of epithelial monolayers shows a power-law dependence on the time with an exponent larger than that of a single cell. Under static loadings, the elastic modulus of epithelial monolayers is nearly two orders of magnitude higher than that of a single cell. To date, there is a lack of a mechanical model that can describe both the dynamic and static mechanical responses of epithelial monolayers. Here, based on the structural features of cells, we establish a multi-scale structural model of cell monolayers. It is found that the proposed model can naturally capture the dynamic and static mechanical properties of cell monolayers. Further, we explore the effects of the cytoskeleton and the membrane moduli on the dynamical power-law rheological responses and static stress-strain relations of a single cell and cell monolayers, respectively. Our work lays the foundation for subsequent studies of the mechanical behavior of more complex epithelial tissues.
摘要
上皮单层在伤口愈合和胚胎发育等各种生理活动中起着十分重要的作用. 随着技术的快速发展, 上皮单层的力学行为得到了广泛的关注与研究. 在阶跃载荷作用下, 上皮单层的蠕变响应表现出对时间的幂律依赖, 且其幂律指数大于单细胞的幂律指数. 而在静态载荷下, 上皮单层的弹性模量比单细胞高出近两个数量级. 到目前为止, 仍然缺乏一个能够同时描述上皮单层动态和静态响应的力学模型. 本文基于细胞的结构特征, 建立了一个多尺度结构的细胞单层模型. 所建模型能够自然地描述细胞单层的动态和静态力学行为. 此外, 本文还探讨了细胞骨架和细胞膜模量分别对单细胞和细胞单层的幂律流变学响应以及应力-应变关系的影响. 这一工作为后续研究更复杂的上皮单层的力学行为奠定了基础.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 12072252 and 12122210) and the Natural Science Basic Research Plan in Shanxi Province of China (Grant No. 2019JC-02).
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Wang, H., Hang, JT., Chang, Z. et al. Static and dynamic mechanics of cell monolayers: A multi-scale structural model. Acta Mech. Sin. 38, 222006 (2022). https://doi.org/10.1007/s10409-022-22006-x
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DOI: https://doi.org/10.1007/s10409-022-22006-x