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arXiv physics/0612156physics.bio-ph
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细胞-基质粘附丧失导致成纤维细胞周期性形状振荡

Loss of Cell-Substrate Adhesion Leads to Periodic Shape Oscillations in Fibroblasts

Pramod A Pullarkat

摘要:

我们报告的现象周期性的形状振荡发生在3T3成纤维细胞仅仅作为一个结果的损失细胞基质粘附。振荡行为可以在恒定频率下持续数小时,并且可以使用化学试剂关闭和打开。这种稳健性允许使用单细胞提取定量数据。我们表明,振荡的频率增加,增加肌动球蛋白收缩。肌球蛋白轻链激酶以及Rho激酶途径都显示在此过程中起作用。此外,我们揭示了显着的相似之处之间的振荡动力学和常见的气泡现象。我们发现,这两个过程停止时,细胞外钙耗尽或拉伸激活的钙通道被阻断。这一点,以及这些动力学过程需要肌动球蛋白接触性的事实,指向各自机制的强烈相似性。最后,我们推测了一个可能的机制所观察到的动力学现象。

英文摘要:

We report the phenomenon of periodic shape oscillations occurring in 3T3 fibroblasts merely as a consequence of a loss of cell-substrate adhesion. The oscillatory behavior can last many hours at a constant frequency, and can be switched off and on using chemical agents. This robustness allows for the extraction of quantitative data using single cells. We demonstrate that the frequency of oscillations increases with increasing actomyosin contractility. Both the Myosin Light Chain Kinase as well as the Rho Kinase pathways are shown to operate during this process. Further, we reveal significant similarities between the oscillatory dynamics and the commonly observed phenomenon of blebbing. We show that both these processes ceases when extracellular calcium is depleted or when stretch activated calcium channels are blocked. This, along with the fact that these dynamical processes require actomyosin contactility points towards strong similarities in the respective mechanisms. Finally, we speculate on a possible mechanism for the observed dynamical phenomena.

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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