首页> 外文期刊>American Journal of Physiology >A novel mouse-driven ex vivo flow chamber for the study of leukocyte and platelet function.
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A novel mouse-driven ex vivo flow chamber for the study of leukocyte and platelet function.

机译:一种新型的小鼠驱动的离体流动室,用于研究白细胞和血小板功能。

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摘要

Various in vitro and in vivo techniques exist for study of the microcirculation. Whereas in vivo systems impress with their physiological fidelity, in vitro systems excel in the amount of reduction that can be achieved. Here we introduce the autoperfused ex vivo flow chamber designed to study murine leukocytes and platelets under well-defined hemodynamic conditions. In our model, the murine heart continuously drives the blood flow through the chamber, providing a wide range of physiological shear rates. We used a balance of force approach to quantify the prevailing forces at the chamber walls. Numerical simulations show the flow characteristics in the chamber based on a shear-thinning fluid model. We demonstrate specific rolling of wild-type leukocytes on immobilized P-selectin, abolished by a blocking MAb. When uncoated, the surfaces having a constant shear rate supported individual platelet rolling, whereas on areas showing a rapid drop in shear platelets interacted in previously unreported grapelikeconglomerates, suggesting an influence of shear rate on the type of platelet interaction. In summary, the ex vivo chamber amounts to an external vessel connecting the arterial and venous systems of a live mouse. This method combines the strengths of existing in vivo and in vitro systems in the study of leukocyte and platelet function.
机译:存在用于研究微循环的各种体外和体内技术。体内系统的生理保真度令人印象深刻,而体外系统在可以实现的减少量方面表现出色。在这里,我们介绍了自动灌注的离体流室,该室旨在研究在明确的血液动力学条件下的鼠白细胞和血小板。在我们的模型中,鼠心连续驱动血液流过腔室,提供广泛的生理剪切速率。我们使用力平衡方法来量化腔室壁上的主导力。数值模拟显示了基于剪切稀化流体模型的室内流动特性。我们证明了固定型P-选择素上野生型白细胞的特异性滚动,被阻断的单克隆抗体所废除。当未涂层时,具有恒定剪切速率的表面支持单个血小板的滚动,而在显示剪切血小板快速下降的区域中,在先前未报告的葡萄状砾岩中相互作用,提示剪切速率对血小板相互作用类型的影响。总之,离体腔相当于连接活小鼠的动脉和静脉系统的外部血管。该方法结合了现有的体内和体外系统在研究白细胞和血小板功能方面的优势。

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