非特定的膜矩阵相互作用影响水凝中的脂质囊泡的扩散性
Nicky W Tam1, Otto Schullian2, Amaia Cipitria3
1Max Planck Institute of Colloids and Interfaces, Science Park Golm, Potsdam, Germany.
Biophysical journal
|February 9, 2024
概括
组织中的细胞外囊泡和脂质体扩散是药物输送的关键. 这项研究揭示了囊泡的特性,如电荷和可变形性,以及PEGylation,如何影响它们在水凝环境中的运动.
科学领域:
- 生物材料科学 生物材料科学
- 纳米技术 纳米技术
- 药物输送系统 药物输送系统
背景情况:
- 在体内细胞外囊泡 (EV) 和脂质体扩散对于开发有效的药物输送系统至关重要.
- 组织微环境显著影响这些纳米粒子的运动和生物分布.
- 了解固态和静电相互作用对于优化基于脂质体的治疗方法至关重要.
研究的目的:
- 研究固体和静电相互作用对合成大单状囊泡 (SUV) 扩散性的影响.
- 使用自下而上的仿生方法来隔离和研究水凝模型中的SUV扩散.
- 为了阐明膜特性和表面修改如何影响模拟细胞外矩阵环境中的SUV移动性.
主要方法:
- 采用自下而上的仿生方法来创建和研究合成的大型单囊 (SUV).
- 使用单颗粒追踪 (SPT) 监测SUV扩散在阿加罗斯水凝模型.
- 研究不同囊泡膜特性 (可变形,表面电荷) 和表面被动化 (PEGylation) 的影响.
主要成果:
- 气囊膜的变形性和表面电荷显著影响可访问的水凝孔隙空间,从而影响整体扩散性.
- 用PEGylated脂质被动化增强SUV的扩散性,这种效应不仅仅归因于静电相互作用.
- 实验结果与现有的计算和理论模型相关联,以了解粒子-凝矩阵相互作用.
结论:
- 膜特性和表面特征是复杂的水凝环境中囊泡扩散的关键决定因素.
- 基化通过超出简单静电排斥的机制增强了扩散性,这表明了复杂的固体效应.
- 这项研究提供了对控制纳米粒子扩散的非特异性相互作用的见解,有助于设计先进的药物输送车辆.
更多相关视频
07:54Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
Published on: October 15, 2015
8.1K
12:18Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
Published on: August 3, 2021
3.5K
相关概念视频
Protein Diffusion in the Membrane
4.4K
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
4.4K
Membrane Fluidity
152.3K
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.
152.3K
Diffusion
192.2K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
192.2K
Mechanisms of Membrane Domain Formation
3.0K
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
Another mechanism for membrane domain formation involves membrane proteins interacting with...
3.0K
Membrane Domains
5.4K
The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
5.4K
Fluid Mosaic Model
11.7K
Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
11.7K
