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arXiv 2302.04111cond-mat.softq-bio.TO
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顶点模型的粗粒化及其对剪切的响应

Coarse-graining the vertex model and its response to shear

Gloria Triguero-Platero, Falko Ziebert, Luis L. Bonilla

AI总结:

本文通过泊松括号方法对顶点模型进行粗粒化,推导出二维细胞单层的宏观方程,研究其稳态、稳定性及剪切响应,揭示了流动与细胞形状的相互作用。

摘要:

组织动力学和集体细胞运动是关键的生物过程。其生物学机制大多已知,并且存在如“主动顶点模型”(AVM)等模拟模型,这些模型与组织流化或指状化等实验观察结果合理吻合。然而,一个良好且有充分依据的组织连续描述仍有待发展。在本工作中,我们通过泊松括号方法对顶点模型进行粗粒化,推导出二维细胞单层的宏观描述。我们得到了细胞密度、速度和细胞形状张量的方程。随后,我们研究了均匀稳态、其稳定性(与热力学稳定性一致),特别是它们在外加剪切作用下的行为。我们的结果有助于阐明流动与细胞形状之间的相互作用。所得到的宏观方程为添加细胞运动、形态发生及其他生物学相关过程提供了良好的起点。

英文摘要:

Tissue dynamics and collective cell motion are crucial biological processes. Their biological machinery is mostly known, and simulation models such as the "active vertex model" (AVM) exist and yield reasonable agreement with experimental observations like tissue fluidization or fingering. However, a good and well-founded continuum description for tissues remains to be developed. In this work we derive a macroscopic description for a two-dimensional cell monolayer by coarse-graining the vertex model through the Poisson bracket approach. We obtain equations for cell density, velocity and the cellular shape tensor. We then study the homogeneous steady states, their stability (which coincides with thermodynamic stability), and especially their behavior under an externally applied shear. Our results contribute to elucidate the interplay between flow and cellular shape. The obtained macroscopic equations present a good starting point for adding cell motion, morphogenetic and other biologically relevant processes.

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