湍流流动对血管内皮细胞黏附分子表达的影响

本研究考察了ECs在不同流场中的血管细胞黏附分子(VCAM-1)和胞间黏附分子(ICAM—1)表达，揭示了湍流流体力学信号影响黏附分子表达和ECs功能状态。构建了层流和湍流的离体流室模型，运用共聚焦显微镜，从蛋白水平考察培养的人脐静脉ECs中VCAM-1和ICAM-1在不同流室中的表达。发现层流中VCAM-1表达显著增强，而ICAM-1表达只一过性增加，随即回落。湍流中VCAM-1表达下降，而ICAM-1表达持续缓慢上升。由此表明：湍流流场对血管ECs黏附特性的影响不同于层流，而且不同的黏附分子对流动具有不同的响应性；湍流是引起ECs形态结构和功能行为的病理学改变的重要原因。

Effect of Turbulent Flow on Adhesion Molecules Expression of Vascular Endothelial Cells

Mechanical environment seems to be one of the most important surviving environment for vessel conduit and vascular endothelial cells(ECs), while adhesion is one of the most important physical characteristics of ECs. In this study, Flow chambers of steady laminar and turbulent flow are made and improved. Different flow-derived VCAM-1, ICAM-1 expressions are detected by laser confocal microscope. Spacial and temporal curves of the adhesion molecules are protracted. In laminar flow, expression of VCAM-1 is dramatically elevated, whereas the expression of ICAM-1 is transiently elevated and it immediately falls back to the baseline. In turbulent flow, expression of VCAM-1 declines, while expression of ICAM-1 slowly rises to a peak. These results indicate that such pathological flow field as turbulence exerts different influence on the adhesion of vascular ECs from laminar flow, and turbulence could be one of the most important reasons of the ECs structural and functional lesion.