首页> 外文期刊>American Journal of Physiology >Cytoskeletal mechanics in adherent human airway smooth muscle cells: probe specificity and scaling of protein-protein dynamics.
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Cytoskeletal mechanics in adherent human airway smooth muscle cells: probe specificity and scaling of protein-protein dynamics.

机译:粘附的人气道平滑肌细胞的细胞骨架力学:探针特异性和蛋白质-蛋白质动力学的缩放。

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摘要

We probed elastic and loss moduli in the adherent human airway smooth muscle cell through a variety of receptor systems, each serving as a different molecular window on cytoskeletal dynamics. Coated magnetic microbeads were attached to the cell surface via coating-receptor binding. A panel of bead coatings was investigated: a peptide containing the sequence RGD, vitronectin, urokinase, activating antibody against beta(1)-integrin, nonactivating antibody against beta(1)-integrin, blocking antibody against beta(1)-integrin, antibody against beta(1)-integrin, and acetylated low-density lipoprotein. An oscillatory mechanical torque was applied to the bead, and resulting lateral displacements were measured at baseline, after actin disruption by cytochalasin D, or after contractile activation by histamine. As expected, mechanical moduli depended strongly on bead type and bead coating, differing at the extremes by as much as two orders of magnitude. In every case, however, elastic and loss moduli increased with frequency f as a weak power law, f( x-1). Moreover, with few exceptions, data could be scaled such that elastic and frictional responses depended solely on the power law exponent x. Taken together, these data suggest that power law behavior represents a generic feature of underlying protein-protein dynamics.
机译:我们通过多种受体系统在粘附的人气道平滑肌细胞中探查​​了弹性模量和损失模量,每个受体系统充当细胞骨架动力学的不同分子窗口。包被的磁性微珠通过包被-受体结合而附着于细胞表面。研究了一组珠涂层:包含以下序列的肽:RGD,玻连蛋白,尿激酶,针对β(1)-整合素的活化抗体,针对β(1)-整合素的非活化抗体,针对β(1)-整合素的封闭抗体,抗体针对beta(1)整合素和乙酰化的低密度脂蛋白。向小珠施加振荡机械扭矩,并在基线,细胞松弛素D破坏肌动蛋白后或组胺收缩激活后测量所产生的横向位移。如预期的那样,机械模量在很大程度上取决于珠子类型和珠子涂层,在极端情况下相差多达两个数量级。然而,在每种情况下,作为弱幂定律f(x-1),弹性模量和损耗模量都随频率f的增加而增加。此外,除少数例外,可以对数据进行缩放,以使弹性和摩擦响应仅取决于幂律指数x。综合来看,这些数据表明幂律行为代表了潜在的蛋白质-蛋白质动力学的一般特征。

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