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arXiv 2003.04601q-bio.TO
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生长组织中界面的不稳定性与指进现象

Instability and fingering of interfaces in growing tissue

Tobias Büscher, Angel L. Diez, Gerhard Gompper, Jens Elgeti

AI总结:

本文通过计算机模拟研究基底上生长组织界面的稳定性,发现稳态应力、细胞运动性、组织粘度和基底摩擦四个参数决定界面动力学,并揭示了不同条件下界面失稳与指进现象的机制。

摘要:

组织中的界面无处不在,既存在于组织与环境之间,也存在于不同细胞类型的群体之间。界面的传播可以由力学机制驱动,例如不同细胞类型各自的稳态应力差异。本文采用生长组织的计算机模拟来研究基底上两种组织之间界面的稳定性。从力学角度来看,该系统的动力学和稳定性主要由各自组织的四个参数控制:稳态应力、细胞运动性、组织粘度和基底摩擦。对于由稳态应力差异驱动的传播,当组织特异性基底摩擦存在时,即使稳态应力差异非常大,界面也是稳定的;然而,当具有较大稳态应力的组织具有更高粘度时,在超过临界应力差异后界面会变得不稳定。两种组织之间定向体运动性的微小差异足以导致具有稳定界面的传播,即使其他方面组织完全相同。然而,运动性力的较大差异会导致界面出现有限波长不稳定性。有趣的是,这种不稳定性显然受到非线性效应的约束,界面波动的幅度随时间仅增长至有限值。

英文摘要:

Interfaces in tissues are ubiquitous, both between tissue and environment as well as between populations of different cell types. The propagation of an interface can be driven mechanically. % e.g. by a difference in the respective homeostatic stress of the different cell types. Computer simulations of growing tissues are employed to study the stability of the interface between two tissues on a substrate. From a mechanical perspective, the dynamics and stability of this system is controlled mainly by four parameters of the respective tissues: (i) the homeostatic stress (ii) cell motility (iii) tissue viscosity and (iv) substrate friction. For propagation driven by a difference in homeostatic stress, the interface is stable for tissue-specific substrate friction even for very large differences of homeostatic stress; however, it becomes unstable above a critical stress difference when the tissue with the larger homeostatic stress has a higher viscosity. A small difference in directed bulk motility between the two tissues suffices to result in propagation with a stable interface, even for otherwise identical tissues. Larger differences in motility force, however, result in a finite-wavelength instability of the interface. Interestingly, the instability is apparently bound by nonlinear effects and the amplitude of the interface undulations only grows to a finite value in time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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