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Shock wave interaction with a phospholipid membrane: coarse-grained computer simulations.

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Shock wave-induced nanobubble collapse can damage lipid bilayers, creating temporary pores. While bilayers recover, water transport occurs, and some lipids may form micelles.

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Area of Science:

  • Biophysics
  • Materials Science
  • Computational Chemistry

Background:

  • Lipid bilayers are essential biological membranes.
  • Nanobubble collapse can generate localized high pressures and stresses.
  • Understanding membrane poration mechanisms is crucial for drug delivery and biomaterial design.

Purpose of the Study:

  • To investigate the poration of lipid bilayers by shock wave-induced nanobubble collapse.
  • To analyze the effects of nanobubble size and shock wave velocity on bilayer damage and recovery.
  • To characterize water transport and lipid behavior during and after pore formation.

Main Methods:

  • Simulations using the MARTINI coarse-grained force field.
  • Modeling of lipid bilayers with varying nanobubble sizes.
  • Application of shock waves with different velocities to the simulated systems.

Main Results:

  • Observed creation of pores and damage to lipid bilayers.
  • Demonstrated subsequent pore closing and bilayer recovery after shock wave passage.
  • Quantified significant water transport through transiently formed pores.
  • Identified lipid displacement into the aqueous phase, leading to micelle formation.

Conclusions:

  • Lipid bilayers exhibit recovery capabilities after shock wave-induced nanobubble collapse.
  • Nanobubble collapse is a viable mechanism for transient membrane poration.
  • Significant water permeation and lipid redistribution occur during this process.