Modeling Interactions between Liposomes and Hydrophobic Nanosheets

Area of Science:

• Biophysics
• Materials Science
• Nanotechnology

Background:

• Two-dimensional (2D) nanomaterials offer potential for biomedical uses like drug delivery.
• However, their cytotoxicity due to structural disruption of cell membranes poses significant challenges.

Purpose of the Study:

• To investigate the physical and mechanical interactions between lipid liposomes and hydrophobic 2D nanosheets.
• To understand the molecular mechanisms underlying nanomaterial-induced membrane damage.

Main Methods:

• Coarse-grained (CG) molecular dynamics (MD) simulations were employed.
• Analysis of interaction morphologies, dynamic processes, and thermodynamic changes.

Main Results:

• Nanosheet size and orientation dictate interaction morphologies with liposomes.
• Observed molecular motions include lipid extraction, flip-flop, and spreading, leading to liposome deformation (corrugation, splitting, collapse).
• Embedded nanosheets significantly reduce lipid bilayer fluidity, with cumulative effects from continuous intrusion.

Conclusions:

• Hydrophobic 2D nanosheets can induce significant structural changes and reduce membrane fluidity in liposomes.
• Findings provide molecular-level insights into nanomaterial cytotoxicity, aiding nanotoxicology research.
• This study bridges computational modeling and experimental approaches for safer nanomaterial design.