Cellular Determinants of Fibrin Structure and Stability

纤维蛋白结构和稳定性的细胞决定因素

• 批准号: 7735611
• 负责人: Alisa S. Wolberg
• 金额: $ 32.95万
• 依托单位: UNIV OF NORTH CAROLINA CHAPEL HILL
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-10 至 2014-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7735611
• 关键词: Affect; Anticoagulants; Blood; Blood Clot; Blood Coagulation Factor; Blood Vessels; Blood coagulation; Blood flow; Cause of Death; Cell surface; Cells; Coagulation Process; Data; Diffusion; Disease; Distal; Embolism; Endothelial Cells; Fiber; Fibrin; Fibrinolysis; Fibroblasts; Generations; Growth; Hemorrhage; Hemostatic Agents; Human; In Situ; Infection; Injury; Integrins; Internet; Laser Scanning Confocal Microscopy; Location; Measures; Mechanics; Microscopy; Microspheres; Morphology; Outcome; Permeability; Plasma; Predisposition; Production; Proteins; Receptor Cell; Research; Resistance; Risk; Risk Factors; Role; Site; Smooth Muscle Myocytes; Structure; Supporting Cell; Surface; Techniques; Technology; Testing; Thrombin; Thrombomodulin; Thromboplastin; Thrombosis; Thrombus; Transmission Electron Microscopy; Western World; Wound Healing; cytokine; density; disability; in vivo; novel; physical property; prevent; public health relevance; receptor; receptor expression; research study; three dimensional structure

DESCRIPTION (provided by applicant): Following injury, tissue factor (TF)-bearing cells are exposed to the blood, triggering blood clot formation. Blood clots are stabilized by a web-like network of fibrin, which protects the clot from the rigors of flowing blood. Fibrin also has immunological functions during infection and contributes to wound healing. Studies have shown that abnormalities in the formation or quality (structure and/or stability) of the fibrin network are an established, independent risk factor for abnormal blood clots (thrombosis and/or bleeding). We and others have shown that different cells determine fibrin quality via their procoagulant activity and receptor expression. Interestingly, both cellular procoagulant activity and receptors produce fibrin that is denser and more stable near the cell than further away from the cell surface. We hypothesize that the spatial location of thrombin generation influences clot structure and stability. We will use laser scanning confocal microscopy to characterize activities that regulate fibrin clot structure proximal and distal to the site of clotting initiation. We will specifically investigate the roles of cell stimulation, cellular and circulating tissue factor, soluble clotting factors, and cell receptors in determining clot structure. We will use passive and magnetically-driven microbead techniques and microscopy to examine how vascular cells modulate fibrin network permeability, mechanical strength and resistance to fibrinolysis. Finally, we will use transmission electron microscopy to compare fibrin structure in clots formed under different shear rates on freshly-excised human vessels. We anticipate our data will show how different hemostatic and prothrombotic mechanisms contribute to clot structure and stability in static and low shear conditions. These mechanisms may be specific targets for preventing intravascular thrombosis and/or embolism. PUBLIC HEALTH RELEVANCE: Inappropriate blood clot formation (thrombosis) is the leading cause of death and disability in the Western world. Understanding the mechanisms leading to thrombosis is critical in order to develop approaches for preventing this devastating disease.

描述（由申请人提供）：损伤后，携带组织因子（TF）的细胞暴露于血液中，引发血凝块形成。血凝块是由纤维蛋白组成的网状网络稳定的，它保护血凝块不受血液流动的冲击。纤维蛋白在感染过程中也具有免疫功能，有助于伤口愈合。研究表明，纤维蛋白网络的形成或质量（结构和/或稳定性）异常是异常血块（血栓形成和/或出血）的一个确定的、独立的危险因素。我们和其他人已经表明，不同的细胞通过促凝活性和受体表达来决定纤维蛋白的质量。有趣的是，细胞促凝活性和受体产生的纤维蛋白在细胞附近比远离细胞表面更密集、更稳定。我们假设凝血酶生成的空间位置影响凝块结构和稳定性。我们将使用激光扫描共聚焦显微镜来表征调节凝血起始部位近端和远端纤维蛋白凝块结构的活动。我们将特别研究细胞刺激、细胞和循环组织因子、可溶性凝血因子和细胞受体在决定凝块结构中的作用。我们将使用被动和磁驱动的微珠技术和显微镜来研究血管细胞如何调节纤维蛋白网络的渗透性、机械强度和纤维蛋白溶解的抵抗力。最后，我们将使用透射电子显微镜来比较在不同剪切速率下在新鲜切除的人血管上形成的血块中的纤维蛋白结构。我们预计我们的数据将显示在静态和低剪切条件下，不同的止血和血栓形成机制如何促进凝块结构和稳定性。这些机制可能是预防血管内血栓形成和/或栓塞的特定靶点。公共卫生相关性：在西方世界，不适当的血凝块形成（血栓）是导致死亡和残疾的主要原因。了解导致血栓形成的机制对于开发预防这种毁灭性疾病的方法至关重要。