Spontaneous and Stress-Induced Pore Formation in Membranes: Theory, Experiments and Simulations

Area of Science:

• Biophysics
• Cell Biology
• Membrane Science

Background:

• Biological membranes exhibit plasticity, enabling diverse permeability modes vital for cellular functions like cell death.
• Membrane permeability is key for applications in gene transfer, drug delivery, infection prevention, and cancer therapy.
• A deeper understanding of membrane permeability phenomena is necessary for controlled and specific manipulation.

Purpose of the Study:

• To provide a quantitative understanding of membrane permeabilization phenomena.
• To develop theoretical models for describing pore formation in biological membranes.
• To explore the impact of lipid properties and stress conditions on membrane permeability.

Main Methods:

• Theoretical developments in modeling continuous trajectories of pore formation.
• Molecular dynamics simulations to investigate the role of water in membrane permeabilization.
• Experimental validation of theoretical predictions and simulation findings.

Main Results:

• A new theoretical model provides a coherent quantitative view of membrane permeabilization.
• The model predicts novel dependencies of line tension on pore radius and lateral tension, explaining prior observations.
• Molecular dynamics simulations highlight the significant role of water in membrane permeabilization.

Conclusions:

• Recent theoretical and simulation advances offer significant progress in understanding membrane permeability.
• The developed theoretical framework allows for testing lipid property impacts and predicting pore intermediates.
• Future research will focus on experimental and simulation-based validation of theoretical predictions for membrane permeabilization.