Related Experiment Video
Updated: Jun 7, 2026
07:31
Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
Published on: September 1, 2023
Interplay between structure and fluidity of model lipid membranes under oxidative attack.
Wan-Yu Tai1, Yi-Cyun Yang, Hui-Jen Lin
1Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 300, Taiwan.
The Journal of Physical Chemistry. B
|November 9, 2010
Summary
Oxidative stress damages cell membranes by altering lipid structure and fluidity. This study reveals how hydroxyl radicals increase membrane fluidity, while vitamins C and E, and cholesterol offer protection.
Area of Science:
- Biochemistry
- Cell Biology
- Biophysics
Background:
- Membrane fluidity is crucial for cellular functions like cell communication and mitosis.
- Unsaturated lipids in membranes are vulnerable to oxidative damage from reactive oxygen species.
- Oxidized lipids can disrupt membrane structure, altering fluidity and cellular processes.
Purpose of the Study:
- To investigate the effects of oxidative attack on model membrane fluidity and structure.
- To elucidate the protective mechanisms of vitamins C and E, and cholesterol against oxidative damage.
- To understand the relationship between membrane structure, fluidity, and cellular oxidative injury.
Main Methods:
- Fluorescence Correlation Spectroscopy (FCS) to measure membrane fluidity.
- Raman Spectroscopy to analyze lipid acyl chain structure and identify molecular changes.
- Mass spectrometry to support structural interpretations of lipid oxidation.
Main Results:
- Hydrogen peroxide had minimal impact on membrane fluidity.
- Hydroxyl radicals significantly increased membrane fluidity, likely due to acyl chain cleavage.
- Vitamins C and E inhibited the fluidity increase caused by oxidative attack.
- Membranes with high cholesterol content showed resistance to fluidity alterations.
Conclusions:
- Hydroxyl radical-induced lipid oxidation alters membrane structure and increases fluidity.
- Vitamins C and E and cholesterol can mitigate oxidative damage to membrane fluidity.
- Combined FCS and Raman spectroscopy effectively reveal membrane dynamics and structural changes.
- Findings offer insights into cellular oxidative injury mechanisms and potential therapeutic interventions.
Related Concept Videos
01:26Membrane Fluidity
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 a relatively...
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 a relatively...
01:23Membrane Fluidity
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.Fatty acids tails of phospholipids can be either saturated or...
01:19Fluid Mosaic Model
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 with the analogy of...
01:34Fluid Mosaic Model
The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.LipidsThe most...
01:35Asymmetric Lipid Bilayer
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%...
01:29Biosynthesis of Lipids
Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis pathway, which...