过氧化促进与衰老相关的血小板过活化和血栓形成
Sanjana Dayal1, Katina M Wilson, David G Motto
1Department of Internal Medicine, University of Iowa Carver College of Medicine, 200 Hawkins Dr, 3160 ML, Iowa City, IA 52242, USA. sanjana-dayal@uiowa.edu.
Circulation
|February 22, 2013
概括
由于氧化应激,衰老会增加血栓事件. 过度表达谷氨过氧化酶-1 (Gpx1) 通过降低血小板过活和过氧化水平,保护老年小鼠免受血栓形成.
科学领域:
- 老年学是一门学科.
- 心血管生物学 心血管生物学
- 氧化压力研究研究 氧化压力研究
背景情况:
- 血栓事件在老年人群中更常见,但潜在的机制仍然不清楚.
- 氧化应激与与年龄有关的血栓形成风险有关.
- 这项研究调查了抗氧化酶的过度表达是否能防止与年龄相关的血栓形成.
研究的目的:
- 为了测试老年小鼠过度表达谷氨过氧化酶-1 (Gpx1) 的假设,它们被保护免受实验性血栓形成.
- 阐明氧化应激,特别是过氧化在与年龄有关的血栓发作易感性中的作用.
主要方法:
- 阴道动脉的光化学损伤和下静脉结被用来诱导老年和年轻野生型小鼠的血栓形成.
- 过度表达Gpx1 (Gpx1 Tg) 的转基因小鼠与野生型小鼠进行了对血栓敏感性的比较.
- 在老年小鼠中评估了血小板激活标记 (过氧化,纤维素因子结合,αIIbβ3激活) 和NADPH氧化酶活性.
主要成果:
- 与年轻小鼠相比,年龄较大的野生类型小鼠对动脉封闭的时间显著缩短,对静脉血栓形成的易感性增加.
- Gpx1 Tg小鼠没有表现出缩短的闭塞时间或随着年龄的增长而增加静脉血栓形成的易感性.
- 野生型老年小鼠表现出年龄相关的血小板过活化,由过氧化的增加证明,这在Gpx1 Tg小鼠和抗氧化剂中被阻止.
结论:
- 过氧化是老年小鼠血小板过活性的关键媒介.
- 针对氧化应激路径,例如增加谷氨过氧化酶-1,可以减轻与年龄相关的血栓发作易感性.
相关概念视频
01:24Peroxisomes
13.6K
Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
13.6K
01:30Anticoagulant Drugs: Low-Molecular-Weight Heparins
2.6K
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...
2.6K
01:20Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors
1.6K
Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
1.6K
01:05Introduction to Hemostasis
14.2K
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,...
14.2K
01:22Formation 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
01:24Disorders of Hemostasis
2.7K
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.
2.7K