XIa因子对血栓和等离子体生成,血块形成,溶解和凝血因子缺陷密度的影响
Ivan D Tarandovskiy1, Mikhail V Ovanesov1
1Center of Biologics Evaluation and Research, U.S. Food and Drug Administration, United States of America.
Thrombosis research
|December 15, 2023
概括
激活的XI因子 (FXIa) 在因子缺乏症中影响血栓生成和血栓形成. 这一发现可能有助于区分出血障碍,通过揭示血液静止试验中的新关系.
科学领域:
- 血液静止和血栓形成研究
- 凝血因子的生物化学
- 燃烧和补充系统的系统.
背景情况:
- 激活XI因子越来越多地被认为是它在血栓形成,血液静止,炎症和补充通路中的作用.
- 了解激活因子XI (FXIa) 的确切影响对于解释静血试验至关重要.
研究的目的:
- 为了研究FXIa对全球血液静止试验的影响.
- 评估FXIa对因子缺陷等离子体中血栓生成 (TG),等离子体生成 (PG),凝块形成和溶解 (CFL) 的影响.
主要方法:
- 使用同时吸收和光微板测定来测量TG,PG和CFL.
- 测试的FV,FVII,FVIII和FIX缺陷等离子体补充了纯化的因子.
- 在存在组织等离子素激活剂的情况下,用有或没有FXIa的组织因子启动凝血.
主要成果:
- 在低V因子 (FV) 水平 (<0.1 IU/mL) 和较高的VIII因子 (FVIII) 和IX因子 (FIX) 水平 (>0.01 IU/mL) 的情况下,FXIa增加了TG/CFL.
- FXIa主要在低FV和因子VII (FVII) 度下影响PG.
- 在高因子度下,FXIa降低了最大凝块密度 (MCD).
结论:
- 在因子缺陷的背景下,FXIa强调了TG,PG和CFL参数之间的新型相互联系.
- 这些发现表明FXIa在区分各种出血表型方面具有潜在的实用性.
相关概念视频
01:30Anticoagulant Drugs: Low-Molecular-Weight Heparins
708
Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
708
01:16Clot Retraction and Fibrinolysis
6.1K
After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
6.1K
01:09Coagulation
6.8K
The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
6.8K
01:24Disorders of Hemostasis
922
Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
922
01:20Extrinsic and Intrinsic Pathways of Hemostasis
7.9K
Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
7.9K
01:22Formation of the Platelet Plug
6.4K
The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
6.4K