相关实验视频
Updated: Jul 26, 2025
11:42
Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
Published on: July 10, 2017
11.7K
血小板蛋白质的合成,调节和翻译后修改:机制和功能
1Department of Biochemistry and Molecular Biology Drexel University College of Medicine, Philadelphia, PA, United States.
Critical reviews in biochemistry and molecular biology
|June 22, 2023
概括
曾经认为不能合成蛋白质的哺乳动物血小板,现在已知可以生物合成蛋白质. 本综述详细介绍了对血小板蛋白合成及其生理意义的不断发展的理解.
科学领域:
- 血液学 血液学 血液学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 从历史上看,哺乳动物血小板被认为不能进行蛋白质生物合成.
- 这一教条在20世纪60年代受到挑战,最初的发现经常被驳回.
- 近几十年来,证实和探索血小板蛋白合成的研究激增.
研究的目的:
- 审查对血小板蛋白质合成的历史和当前理解.
- 强调血小板蛋白合成在各种生理和病理条件中的重要性.
- 更新科学界关于自2009年最后一次全面审查以来的最新发现.
主要方法:
- 关于血小板蛋白质合成的历史和当代研究的文献综述.
- 在正常,病理和激活条件下研究蛋白质合成的研究分析.
- 检查蛋白质合成,mRNA处理,翻译调节和血小板内的翻译后修饰的已识别的组件.
主要成果:
- 血小板拥有蛋白质合成的完整机制,包括mRNA处理和翻译调节器.
- 血小板蛋白质组是动态的,对外部信号做出反应,以维持血静和其他功能.
- 证据支持了血小板蛋白质合成在各种生物环境中的重要性.
结论:
- 无核哺乳动物血小板能够进行显著的蛋白质生物合成.
- 血小板蛋白质合成在血液静止和其他生理过程中起着至关重要的作用.
- 目前正在进行的研究继续揭示血小板蛋白合成的全部范围和重要性.
相关概念视频
01:18Structure and Function of Platelets
1.3K
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...
1.3K
01:16Clot Retraction and Fibrinolysis
6.5K
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.
6.5K
01:22Formation of the Platelet Plug
6.7K
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...
6.7K
01:56Structural Protein Function
27.8K
Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to...
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to...
27.8K
01:58Mechanical Protein Functions
5.0K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
5.0K
01:39Mechanism of Filopodia Formation
2.4K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.4K