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Cellular stiffness response to external deformation: Tensional homeostasis in a single fibroblast.

机译:细胞对外部变形的刚度响应:单个成纤维细胞中的张力稳态。

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Stiffness responses of fibroblasts were measured by scanning probe microscopy, following elongation or compression by deformation of an elastic substrate by 8%. The cellular stiffness, reflecting intracellular tension acting along stress fibers, decreased or increased instantly in response to the elongating or compressing stimuli, respectively. After this rapid change, the fibroblasts gradually recovered to their initial stiffness during the following 2 h, and then stabilized. The cells did not show conspicuous changes in shape after the 8% deformation during the SPM measurements. Fluorescence examination for GFP-actin demonstrated that the structure of the stress fibers was not altered noticeably by this small degree of deformation. Treatment with Y-27632, to inhibit myosin phosphorylation and abrogate cellular contractility, eliminated the change in stiffness after the mechanical elongation. These results indicate that fibroblasts possess a mechanism that regulates intracellular tension along stress fibers to maintain the cellular stiffness in a constant equilibrium state. Cell Motil. Cytoskeleton 59:242-248, 2004. (c) 2004 Wiley-Liss, Inc.
机译:成纤维细胞的刚度响应是通过扫描探针显微镜测量的,在通过弹性基底变形8%而伸长或压缩之后。反映沿应力纤维作用的细胞内张力的细胞刚度分别响应于伸长或压缩刺激而立即降低或增加。经过这种快速变化,成纤维细胞在随后的2小时内逐渐恢复到其初始硬度,然后稳定下来。在SPM测量期间,经过8%的变形后,细胞未显示出明显的形状变化。 GFP-肌动蛋白的荧光检查表明,这种小程度的变形不会显着改变应力纤维的结构。用Y-27632处理可抑制肌球蛋白磷酸化并消除细胞收缩力,消除了机械伸长后硬度的变化。这些结果表明,成纤维细胞具有调节沿应力纤维的细胞内张力以将细胞刚度维持在恒定平衡状态的机制。细胞动力。 Cytoskeleton 59:242-248,2004.(c)2004 Wiley-Liss,Inc.

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