Formation and size distribution of self-assembled vesicles

Area of Science:

• Biophysics
• Materials Science
• Biochemistry

Background:

• Detergents and phospholipids self-assemble into vesicles in aqueous solutions.
• Understanding vesiculation is crucial for human physiology, disease elucidation, diagnostics, and drug delivery.

Purpose of the Study:

• To analyze the energetics and thermodynamics of vesiculation using nonlinear elasticity.
• To investigate the effects of membrane size, spontaneous curvature, and stiffness on vesiculation.
• To determine the critical size for vesicle formation and its correlation with membrane properties.

Main Methods:

• Nonlinear elasticity theory applied to large deformation during vesiculation.
• Analysis of membrane size, spontaneous curvature, and stiffness effects.
• Determination of critical membrane size for spontaneous vesiculation.

Main Results:

• Vesicle size and distribution are influenced by membrane size, spontaneous curvature, and stiffness.
• Critical membrane size for vesicle formation correlates with membrane thickness.
• Combined effects of thickness and physical properties dictate vesicle size, shape, and distribution.

Conclusions:

• Findings elucidate the formation of physiological extracellular vesicles (e.g., exosomes).
• Suggests methods to manipulate synthetic vesicle properties for applications in diagnostics and drug delivery.
• Provides insights into vesicle physiology and the pathobiology of diseases like cancer.