首页> 外文期刊>Journal of Biomechanics >Normal and shear stresses influence the spatial distribution of intracellular adhesion molecule-1 expression in human umbilical vein endothelial cells exposed to sudden expansion flow.
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Normal and shear stresses influence the spatial distribution of intracellular adhesion molecule-1 expression in human umbilical vein endothelial cells exposed to sudden expansion flow.

机译:正应力和剪应力影响暴露于突然膨胀流的人脐静脉内皮细胞中细胞内粘附分子1表达的空间分布。

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摘要

Patterns in cell adhesion molecule expression by endothelial cells may play a role in atherogenesis. Previous studies have shown dependence of intracellular adhesion molecule-1 (ICAM-1) expression in human umbilical vein endothelial cells (HUVEC) on shear stress and have indirectly linked ICAM-1 expression to spatial gradients in shear stress. The spatial distribution of ICAM-1 in HUVEC pre-exposed to flow for 8h was determined using fluorescence microscopy and a sudden expansion flow chamber with a 2.66 expansion ratio to simulate gradients in wall shear stress found near arterial branches in vivo. When ICAM-1 expression in the disturbed flow region was compared to theoretical stress distributions obtained from a computational model of sudden expansion flow, a modest trend (R2 = 0.327, p < 0.01)was observed between ICAM-1 and shear stress but the correlation between ICAM-1 and shear stress gradient was insignificant. In contrast, a moderately strong trend (R2 = 0.873, p < 0.01) was evident between ICAM-1 expression and the component of normal stress induced by the expansion. Thus, in this in vitro model, normal stress arising from sudden expansion flow modulates the effect of shear stress on ICAM-1 expression.
机译:内皮细胞表达细胞粘附分子的模式可能在动脉粥样硬化中起作用。先前的研究表明,人脐静脉内皮细胞(HUVEC)中细胞内粘附分子1(ICAM-1)的表达对切应力的依赖性,并将ICAM-1表达与切应力的空间梯度间接相关。使用荧光显微镜和具有2.66膨胀比的突然膨胀流动室来模拟HUVEC中暴露于流动8 h的ICAM-1的空间分布,以模拟在体内动脉分支附近发现的壁切应力梯度。将扰动流区域中的ICAM-1表达与从突然膨胀流的计算模型获得的理论应力分布进行比较时,观察到了ICAM-1与剪切应​​力之间的适度趋势(R2 = 0.327,p <0.01),但相关性ICAM-1与切应力梯度之间的关系不明显。相比之下,ICAM-1表达与由扩张引起的正常应激成分之间存在明显的中等趋势(R2 = 0.873,p <0.01)。因此,在这个体外模型中,突然膨胀流动引起的正应力调节了切应力对ICAM-1表达的影响。

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