血红素水平和整蛋白αIIbβIII功能的影响vWF介导的血小板粘附和剪切诱导的血小板聚合在突然扩张中的作用
Connor T Watson1, Shane C Ward1, Stefano A Rizzo2
1Department of Biomedical Engineering, The Pennsylvania State University, University Park, PA USA.
Cellular and molecular bioengineering
|March 4, 2024
概括
高血红素和剪切率促进血小板聚合,这对于理解血栓形成至关重要. 红细胞和整合素αIIbβIII是这个过程的关键驱动力.
科学领域:
- 生物医学工程 生物医学工程
- 血液学 血液学 血液学
- 心血管研究研究心血管研究
背景情况:
- 剪切介导的血栓形成在动脉和器件诱导的凝血中至关重要.
- 红细胞通过促进血小板边缘化和vWF展开来影响血液静止.
- 红细胞在剪切诱导的血小板聚合中的作用,尤其是在高血红素时,尚未完全理解.
研究的目的:
- 用微流体模型研究不同血红素水平对剪切诱导的血小板聚合的影响.
- 为了确定红细胞和整合素αIIbβIII对血小板粘附和在流下聚合的贡献.
主要方法:
- 使用微流体突然膨胀模型来模拟非生理流条件.
- 实验的血液率从0%到60%,剪切率从1000到10,000s-1进行.
- 监测了血小板粘附和聚合,有或没有抑制整合素αIIbβIII.
主要成果:
- 增加的剪切速率和血红素水平显著增强了血小板粘附和聚合物形成.
- 血小板聚合依赖于αIIbβIII功能和红细胞的存在.
- 降低血红素 (20%) 损害了血小板边缘化和vWF结合,减少粘附.
结论:
- 高血红素水平促进血小板边缘化,通过αIIbβIII促进剪切诱导的血小板聚合.
- 这项研究阐明了与血栓形成和体外分析相关的vWF介导的血小板粘附的关键因素.
- 这些发现对理解和潜在地抑制剪切诱导的血栓形成具有重要意义.
更多相关视频
04:32A Uniform Shear Assay for Human Platelet and Cell Surface Receptors via Cone-plate Viscometry
Published on: June 5, 2019
7.6K
09:38A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
Published on: February 14, 2017
13.8K
相关概念视频
Formation of the Platelet Plug
6.2K
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...
6.2K
Intracellular Signaling Affects Focal Adhesions
2.7K
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
2.7K
Introduction to Hemostasis
7.7K
Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized,...
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized,...
7.7K
Structure and Function of Platelets
1.2K
The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
1.2K
Clot Retraction and Fibrinolysis
5.9K
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.
5.9K
Extrinsic and Intrinsic Pathways of Hemostasis
7.6K
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...
7.6K
