Molecular Dynamics Simulations of Liposomes: Structure, Dynamics, and Applications

Area of Science:

• Biophysics
• Computational Chemistry
• Nanotechnology

Background:

• Liposomes are versatile nanoscale vesicles used as drug delivery systems.
• Their clinical significance is demonstrated by FDA-approved formulations.
• Understanding liposomal membrane biophysics is crucial for optimizing therapeutic applications.

Purpose of the Study:

• To review how molecular dynamics (MD) simulations advance the understanding of liposomal membranes.
• To explore the impact of factors like cholesterol and PEGylation on membrane properties.
• To discuss simulation-guided strategies for designing improved liposomal therapeutics.

Main Methods:

• Utilizing coarse-grained (CG) and atomistic MD simulations.
• Analyzing key membrane biophysical properties (APL, SCD, etc.).
• Employing modeling tools like TS2CG, CHARMM-GUI Martini Maker, and Packmol.

Main Results:

• MD simulations reveal how cholesterol, PEGylation, and curvature affect liposomal membrane properties.
• Curvature-induced effects in spherical vesicles, including lipid asymmetry and stress gradients, were analyzed.
• Simulation-guided strategies enable the design of stealth liposomes with tuned permeability and enhanced stability.

Conclusions:

• MD simulations provide critical in silico insights into liposomal behavior.
• These simulations are pivotal for the rational design of next-generation liposomal therapeutics.
• Advancements in CG force fields and AI-integrated techniques continue to improve simulation accuracy and efficiency.