血小板原受体及其在调节血小板粘附模式和在替代加工的原基质上激活中的作用
T P Lemmens1, Q Luo2, S J H Wielders1
1Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands.
Thrombosis research
|November 5, 2024
概括
这项研究表明,不同的原源通过葡萄糖蛋白VI (GPVI) 和α2β1受体独特地激活血小板. 酸溶性原体显示出不同的受体作用,有助于抗血小板药物评估.
科学领域:
- 血液学 血液学 血液学
- 生物化学 生化学
- 心血管研究研究心血管研究
背景情况:
- 血小板激活和血栓形成在血液静止和血栓形成中至关重要.
- 原体受体,包括糖蛋白VI (GPVI),α2β1和GPIb-IX-V复合体,调解血小板与原体的相互作用.
- 像马肌 (HORM) 原蛋白这样的标准原蛋白来源可能不能完全代表不同的原介导血小板反应.
研究的目的:
- 研究GPVI,α2β1和GPIb-IX-V复合体在各种原体类型的血小板激活和血栓形成中的不同作用.
- 为了比较血小板对HORM原蛋白,老鼠尾部原蛋白和人类带衍生的酸溶性原蛋白的反应.
- 评估替代原表面的潜力,以评估抗血小板疗法.
主要方法:
- 使用洗净的血小板和不同的原制剂进行血小板聚合试验.
- 全血 perfusion 测定在高剪速 (1600 s-1) 和较低速率 (150 s-1) 的测定.
- 使用向GPIbα (6B4),α2β1 (6F1) 和GPVI (glenzocimab) 的单克隆抗体进行抑制研究.
主要成果:
- 血小板聚合的依赖性各不相同:需要HORM原蛋白α2β1和GPVI;酸溶性原蛋白主要是GPVI;大鼠尾原蛋白仅是α2β1.1.
- 在高剪切时,GPIb-IX-V复合体对所有原体类型的初始血小板粘附和激活至关重要.
- 在所有原体上,GPVI抑制显著损害了血栓形成和激活标记物 (P-选择素,PS暴露). 抑制α2β1具有不同的效果,取决于原类型和剪切速率.
结论:
- 不同的原源引发不同的血小板受体参与和激活途径.
- 酸溶性原蛋白表面适合研究原体受体的增强作用,并且可能比HORM原蛋白具有优势.
- 这些发现强调了使用多种原基质来全面评估抗血小板药物疗效的重要性.
相关概念视频
Formation of the Platelet Plug
4.6K
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...
4.6K
Intracellular Signaling Affects Focal Adhesions
2.6K
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...
2.6K
Structure and Function of Platelets
1.0K
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...
1.0K
Selectins
3.3K
Cell adhesion is an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain,...
3.3K
Fibril-associated Collagen
2.5K
Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
2.5K
Cell-matrix's Response to Mechanical Forces
2.6K
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...
2.6K


