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首页> 外文期刊>Annals of Biomedical Engineering: The Journal of the Biomedical Engineering Society >Neutrophil adhesion on endothelial cells in a novel asymmetric stenosis model: effect of wall shear stress gradients.
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Neutrophil adhesion on endothelial cells in a novel asymmetric stenosis model: effect of wall shear stress gradients.

机译:中性粒细胞粘附在新型不对称狭窄模型中的内皮细胞上:壁切应力梯度的影响。

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Leukocytes play a pivotal role in the progression of atherosclerosis. A novel three-dimensional in vitro asymmetric stenosis model was used to better investigate the role of local hemodynamics in the adhesion of leukocytes to an established plaque. The adhesion of a human promyelocytic cell line (NB4) on a human abdominal aortic endothelial cell (EC) monolayer was quantified. NB4 cells were circulated over TNF-alpha stimulated and nonstimulated ECs for 1 or 6 h at 1.25 or 6.25 dynes/cm(2) and compared to static conditions. Cytokine stimulation increased significantly EC expression of intercellular adhesion molecule and vascular cell adhesion molecule. Under static conditions, neutrophils adhered overall more than under flow, with decreased adhesion with increasing shear. Adhesion was significantly higher in the recirculation region distal to the stenosis than in the inlet. Preshearing the ECs decreased the expression of cell adhesion molecules in inflamed endothelium and significantly decreased adhesion. However, the ratio of adhesion between the recirculation zone and the inlet increased, hence exhibiting an increased regional difference. This work suggests an important role for neutrophil-EC interactions in the atherosclerotic process, especially in wall shear stress gradient regions. This is important clinically, potentially helping to explain plaque stability.
机译:白细胞在动脉粥样硬化的进展中起关键作用。一种新颖的三维体外不对称狭窄模型用于更好地研究局部血液动力学在白细胞粘附于已建立斑块上的作用。定量人早幼粒细胞系(NB4)在人腹主动脉内皮细胞(EC)单层上的粘附。 NB4细胞以1.25或6.25达因/厘米(2)在TNF-α刺激和未刺激的EC上循环1或6 h,并与静态条件进行比较。细胞因子刺激显着增加细胞间粘附分子和血管细胞粘附分子的EC表达。在静态条件下,嗜中性粒细胞的总体粘附力要高于流动条件下的粘附力,随着剪切力的增加,粘附力降低。狭窄远端的再循环区域的粘附力明显高于入口。预剪切ECs降低了发炎内皮细胞粘附分子的表达,并显着降低了粘附。然而,再循环区和入口之间的粘附率增加,因此表现出增大的区域差异。这项工作表明中性粒细胞-EC相互作用在动脉粥样硬化过程中,特别是在壁切应力梯度区域中,起着重要的作用。这在临床上很重要,可能有助于解释菌斑的稳定性。

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