The role of F-actin and myosin in epithelial cell rheology.

The role of F-actin and myosin in epithelial cell rheology.
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F-肌动蛋白和肌球蛋白在上皮细胞流变学中的作用。

DOI:
10.1529/biophysj.106.091264
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发表时间:
2006
影响因子:
3.4
通讯作者:
J. Crocker
J. Crocker
中科院分区:
生物学3区
文献类型:
--
作者:
Kathleen M Van Citters;B. Hoffman;G. Massiera;J. Crocker

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虽然肌动蛋白和肌球蛋白是重要的贡献者细胞力的产生,形状的变化,和运动,他们的贡献细胞刚度和频率依赖性流变学尚未最终确定。我们对培养的上皮细胞进行了几种药物干预,以阐明肌动蛋白和肌球蛋白在细胞机械反应和细胞内波动中的作用。一套不同的方法被用来分别检查的力学深层细胞内部和皮质,在响应细胞内ATP的耗竭,解聚的F-肌动蛋白,和抑制肌球蛋白II。这些结果的比较表明,F-肌动蛋白起着重要的作用,在上皮细胞的皮质区的力学,但其中断有没有明显的影响,更深的内部的流变学。此外,我们发现,肌球蛋白没有显着的流变学或ATP依赖性,在细胞内部的非布朗运动。最后,我们调查了一些微观流变学方法报告的表观刚度值的广泛分布,这是没有观察到的两点微观流变学。基于我们的研究结果和一个简单的模型,我们得出结论,示踪剂细胞骨架接触的异质性,而不是网络本身,可以解释广泛分布的表观硬度。
Although actin and myosin are important contributors to cell-force generation, shape change, and motility, their contributions to cell stiffness and frequency-dependent rheology have not been conclusively determined. We apply several pharmacological interventions to cultured epithelial cells to elucidate the roles of actin and myosin in the mechanical response of cells and intracellular fluctuations. A suite of different methods is used to separately examine the mechanics of the deep cell interior and cortex, in response to depletion of intracellular ATP, depolymerization of F-actin, and inhibition of myosin II. Comparison of these results shows that F-actin plays a significant role in the mechanics of the cortical region of epithelial cells, but its disruption has no discernable effect on the rheology of the deeper interior. Moreover, we find that myosins do not contribute significantly to the rheology or ATP-dependent, non-Brownian motion in the cell interior. Finally, we investigate the broad distribution of apparent stiffness values reported by some microrheology methods, which are not observed with two-point microrheology. Based on our findings and a simple model, we conclude that heterogeneity of the tracer-cytoskeleton contacts, rather than the network itself, can explain the broad distribution of apparent stiffnesses.
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发表时间: 2004-06
影响因子: 3.4
作者:
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通讯作者: M. Valentine;Z. Perlman;M. Gardel;J. Shin;P. Matsudaira;T. Mitchison;D. Weitz
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DOI: --
发表时间: 2003
期刊: --
影响因子: --
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DOI: 10.1152/jappl.2001.91.2.986
发表时间: 2001-08-01
影响因子: 3.3
作者:
Fabry, B;Maksym, GN;Fredberg, JJ
通讯作者: Fredberg, JJ
DOI: 10.1103/physreve.68.041914
发表时间: 2003-10-01
期刊: PHYSICAL REVIEW E
影响因子: 2.4
作者:
Fabry, B;Maksym, GN;Fredberg, JJ
通讯作者: Fredberg, JJ