Interaction of Caffeine with Model Lipid Membranes
Letizia Tavagnacco1, Giacomo Corucci2, Yuri Gerelli3
1CNR-ISC and Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Rome, Italy.
The Journal of Physical Chemistry. B
|September 1, 2021
Summary
Caffeine does not readily enter lipid bilayers but can be incorporated during self-assembly. Once inside, caffeine molecules preferentially reside in the hydrophobic membrane region, impacting drug delivery and purine permeation.
Area of Science:
- Pharmaceutical Sciences
- Biophysics
- Membrane Biophysics
Background:
- Caffeine is a widely consumed stimulant and a model compound in pharmaceutical research.
- Understanding molecule-membrane interactions is crucial for drug delivery and pharmacology.
- Lipid bilayers serve as model systems for biological membranes.
Purpose of the Study:
- To investigate the interaction of caffeine molecules with a model lipid membrane.
- To determine the conditions under which caffeine can integrate into lipid bilayers.
- To elucidate the location of caffeine within the lipid membrane structure.
Main Methods:
- Quartz-crystal microbalance (QCM) measurements.
- Neutron reflectometry (NR) experiments.
- Study of self-assembled solid-supported lipid bilayers.
Main Results:
- Caffeine does not spontaneously partition into lipid bilayers from an aqueous solution.
- Caffeine can be incorporated into lipid bilayers when co-assembled with lipids.
- Surface-sensitive techniques revealed caffeine's preferential localization within the hydrophobic region of the membrane.
Conclusions:
- Caffeine's incorporation into lipid bilayers is dependent on the assembly process.
- The preferential hydrophobic location of caffeine has implications for membrane permeation.
- Findings are relevant for developing novel drug delivery systems and understanding purine interactions with membranes.
Related Concept Videos
01:19Fluid Mosaic Model
14.1K
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...
14.1K
01:34The Fluid Mosaic Model
166.2K
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.
166.2K
01:26Membrane Fluidity
13.3K
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...
13.3K
01:35Asymmetric Lipid Bilayer
8.6K
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%...
8.6K
01:28Assembly of the Lipid Bilayer in the ER
3.7K
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...
3.7K