胆固醇与雌激醇:对基于的金属体双层膜的动态和结构性质的影响
Baljinder Kaur1, Ganga Ram Chaudhary1, Gurpreet Kaur1
1Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160014, India.
Molecular pharmaceutics
|June 17, 2024
概括
这项研究比较了合成金属体中的胆固醇和厄戈斯特醇,揭示了它们对膜性质和药物输送的度依赖作用. 胆固醇的改变性质比厄戈斯特醇更显著,影响黄素的释放和细菌相互作用.
科学领域:
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
- 生物物理学的生物物理.
背景情况:
- 醇衍生物显著影响脂质体特征.
- 现有的研究主要集中在合成系统中的天然脂质体和胆固醇.
- 在合成脂质体中对不同类固醇的比较研究有限.
研究的目的:
- 研究胆固醇 (Chl) 和埃尔戈斯特 (Erg) 对合成金属体的度依赖作用.
- 为了比较Chl和Erg对金属体特性和黄素输送的影响.
- 了解Chl-和Erg-修饰的金属体与细菌细胞和DNA的对比相互作用.
主要方法:
- 通过薄膜水化,用改性化 (Co:CPC II) 金属表面活性剂制备金属体.
- 形态表征采用了低温传输电子显微镜 (cryo-TEM),原子力显微镜 (AFM) 和场辐射扫描电子显微镜 (FE-SEM).
- 分析了物理化学性质 (大小, ζ-潜力,叶片宽度,疏水性,流动性,刚性),以及黄素的捕获,释放动力学和体外抗菌活性,以对抗 Staphylococcus aureus.
主要成果:
- 金属体保持球形形态,不管是什么类型的固醇或度.
- 固醇的加入显著改变了金属体的大小, ζ-潜力和叶片宽度,以度依赖的方式.
- 胆固醇诱导的更明显的变化在膜疏水性,流动性和刚性,与埃尔戈斯特相比,导致差异性的黄素输送和改变的相互作用与细菌DNA和金黄色葡萄球菌.
结论:
- 固醇衍生物,特别是胆固醇和固醇,在调节合成金属体的特性方面发挥着至关重要的作用.
- 醇衍生物的选择和度可以为药物输送应用微调金属体行为.
- 经欧戈斯特醇修饰的金属体显示出增强药物释放和改变抗菌活性的潜力,这表明基于固醇选择的量身定制应用.
相关概念视频
Asymmetric Lipid Bilayer
7.2K
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
7.2K
Assembly of the Lipid Bilayer in the ER
3.1K
Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
3.1K
Membrane Fluidity
11.1K
Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
11.1K
Membrane Lipids
23.6K
Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
23.6K
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
Cholesterol: Significance and Regulation
535
Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
Considering cholesterol and...
535


