通过纳米/微小化脂质原细胞进行水运输,与范特霍夫透规则有显著的偏差
Shujiao Chen1,2, Shuai Zhang1,2, Qunhui Yuan3
1Shenzhen Key Laboratory of Flexible Printed Electronics Technology, School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen, Guangdong 518055, China.
The journal of physical chemistry. B
|March 12, 2025
概括
奥斯摩斯压力驱动原细胞中的水运输. 然而,像NaCl和CaCl2这样的电解质诱导了快速缩,这表明机械压力也影响了这些脂质囊中的水运动.
科学领域:
- 生物物理学的生物物理.
- 膜科学 膜科学 膜科学
- 物理化学 物理化学
背景情况:
- 通过膜的水运输对生物物理过程至关重要.
- 透压力是这种水流运动的已知驱动因素.
- 了解影响原细胞中水运输的因素至关重要.
研究的目的:
- 研究透压和其他因素对脂质原细胞中水运输的作用.
- 为了比较不同溶液 (糖与电解质) 对原细胞大小的影响.
- 探索透压驱动水的运动之外的潜在机制.
主要方法:
- 脂质原细胞 (囊泡) 的制备,直径约为110 nm.
- 原细胞暴露于不同度的糖,NaCl和CaCl2.
- 观察和测量囊泡大小的变化,以推断水运输.
主要成果:
- 糖的低透压导致原细胞的最小收缩.
- 在较低度的电解质 (NaCl和CaCl2) 诱导了囊泡大小的快速缩小,表明了显著的水流量.
- 观察到一种电解质特异性效应,可能是由增加的界面张力和机械压力驱动的.
结论:
- 透压并不是纳米/微小化脂质原细胞中水运输的唯一决定因素.
- 电解质可以通过涉及机械压力和界面张力的机制诱导水运输.
- 这些发现挑战了对原细胞系统中水运动驱动因素的传统理解.
相关概念视频
The Significance of Membrane Transport
21.4K
The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
21.4K
Membrane Fluidity
150.6K
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
150.6K
Facilitated Diffusion
268
The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
268
Pore Transport and Ion-Pair Transport
324
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
324
Transcellular Transport of Solutes
3.4K
Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
3.4K


