A Microfluidic Model of Hemostasis Sensitive to Platelet Function and Coagulation

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• 作者：R. M. Schoeman ; K. Rana ; N. Danes ; M. Lehmann…
• 关键词：keywordsBiorheology ; Biotransport ; Platelets ; Coagulation
• 刊名：Cellular and Molecular Bioengineering
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：10
• 期：1
• 页码：3-15
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Biomedical Engineering; Classical Mechanics; Continuum Mechanics and Mechanics of Materials; Biological and Medical Physics, Biophysics; Biomaterials; Cell Biology;
• 出版者：Springer US
• ISSN：1865-5033
• 卷排序：10

文摘

Hemostasis is the process of sealing a vascular injury with a thrombus to arrest bleeding. The type of thrombus that forms depends on the nature of the injury and hemodynamics. There are many models of intravascular thrombus formation whereby blood is exposed to prothrombotic molecules on a solid substrate. However, there are few models of extravascular thrombus formation whereby blood escapes into the extravascular space through a hole in the vessel wall. Here, we describe a microfluidic model of hemostasis that includes vascular, vessel wall, and extravascular compartments. Type I collagen and tissue factor, which support platelet adhesion and initiate coagulation, respectively, were adsorbed to the wall of the injury channel and act synergistically to yield a stable thrombus that stops blood loss into the extravascular compartment in ~ 7.5 min. Inhibiting factor VIII to mimic hemophilia A results in an unstable thrombus that was unable to close the injury. Treatment with a P2Y12 antagonist to reduce platelet activation prolonged the closure time two-fold compared to controls. Taken together, these data demonstrate a hemostatic model that is sensitive to both coagulation and platelet function and can be used to study coagulopathies and platelet dysfunction that result in excessive blood loss.