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Updated: Jun 1, 2026
Tethered Bilayer Lipid Membranes to Monitor Heat Transfer between Gold Nanoparticles and Lipid Membranes
Published on: December 8, 2020
A simulation study on nanoscale holes generated by gold nanoparticles on negative lipid bilayers
Jia-Qi Lin1, Yong-Gang Zheng, Hong-Wu Zhang
1State Key Laboratory of Structure Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, PR China.
Cationic gold nanoparticles (AuNPs) can disrupt model cell membranes, forming nanoscale holes that transport water. Hole formation depends on nanoparticle charge, membrane properties, and environmental factors, suggesting it occurs only under extreme conditions in living cells.
Area of Science:
- Nanotechnology
- Biophysics
- Computational Chemistry
Background:
- Understanding gold nanoparticle (AuNP) interactions with cell membranes is crucial for biomedical applications.
- Model bilayer membranes are used to study these fundamental interactions.
- Controlling AuNP behavior requires knowledge of their cellular uptake mechanisms.
Purpose of the Study:
- To investigate the interactions of 2.2 nm core AuNPs with negative model bilayer membranes.
- To explore the formation and characteristics of membrane disruptions caused by AuNPs.
- To identify factors influencing AuNP-induced membrane damage.
Main Methods:
- Coarse-grained (CG) molecular dynamics (MD) simulations were employed.
- A CG model of a lipid bilayer was adapted from existing literature.
- A CG AuNP model was developed using atomistic simulations and experimental data.
Main Results:
- Cationic AuNPs functionalized with cationic ligands penetrated negative bilayer membranes, causing significant disruption.
- A nanoscale hole (radius ~5.5 nm) spontaneously formed and expanded on smaller bilayers (20x20 nm), facilitating water transport.
- Hole formation was prevented on larger bilayers (28x28 nm) and influenced by factors like ligand density, lipid composition, salt concentration, temperature, and surface tension.
Conclusions:
- AuNPs can induce significant structural changes in model cell membranes, including hole formation.
- The formation of these holes is highly dependent on specific conditions and nanoparticle properties.
- Living cell membranes likely require extreme conditions for similar AuNP-induced hole formation to occur.
