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MODELING AND CONTROL OF DYNAMIC CELLULAR MECHANOTRANSDUCTION (I): ACTIN CYTOSKELETON QUANTIFICATION

机译:动态细胞机械转移的建模与控制(I):ACTIN细胞骨架定量

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Living cells respond to external stimuli through the reorganization of the actin cytoskeleton, and the actin cytoskele-ton significantly affects the cellular mechanical behavior. However, due to the lack of approaches to actin cytoskeleton quantification, the dynamics of mechanotransduction is still poorly understood. In this study, we propose an image recognition-based quantification (IRQ) approach to actin cytoskeleton quantification. IRQ quantifies the actin cytoskeleton through three parameters: the partial actin-cytoskeletal deviation (PAD), the total actin-cytoskeletal deviation (TAD) and the average actin-cytoskeletal intensity (AAI). First, Canny and Sobel edge detectors are applied to skeletonize the actin cytoskeleton images, then PAD and TAD are quantified using the direction of lines detected by Hough transform, and AAI is calculated through the summational brightness over the detected cell area. For validation, six different actin cytoskeleton meshwork models were generated to verify the quantification accuracy of IRQ. The average error for both the quantified PAD and TAD was less than 1.22°. Then IRQ was implemented to quantify the actin cytoskeleton of NIH/3T3 cells treated with an F-actin inhibitor. The quantification results suggest that the local and total actin-cytoskeletal organization of treated cells were more disordered than untreated cells, and the quantity of the actin cytoskeleton decreased significantly after the F-actin treatment.
机译:活细胞通过肌动蛋白细胞骨架的重组来响应外部刺激,而肌动蛋白细胞骨架则显着影响细胞的机械行为。然而,由于缺乏肌动蛋白细胞骨架定量方法,对机械转导的动力学仍知之甚少。在这项研究中,我们提出了一种基于图像识别的量化(IRQ)方法进行肌动蛋白细胞骨架定量。 IRQ通过三个参数量化肌动蛋白的细胞骨架:部分肌动蛋白-细胞骨架偏差(PAD),总肌动蛋白-细胞骨架偏差(TAD)和平均肌动蛋白-细胞骨架强度(AAI)。首先,将Canny和Sobel边缘检测器应用于肌动蛋白细胞骨架图像的骨架化,然后使用通过Hough变换检测到的线的方向对PAD和TAD进行量化,并通过检测到的细胞区域上的总亮度计算AAI。为了验证,生成了六个不同的肌动蛋白细胞骨架网格模型,以验证IRQ的定量准确性。定量PAD和TAD的平均误差均小于1.22°。然后实施IRQ以定量用F-肌动蛋白抑制剂处理的NIH / 3T3细胞的肌动蛋白细胞骨架。定量结果表明,处理过的细胞的局部和总肌动蛋白-细胞骨架组织比未处理的细胞更加混乱,并且在F-肌动蛋白处理后肌动蛋白的细胞骨架数量显着减少。

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