Structural features of interacting complementary liposomes promoting formation of multicompartment structures

Area of Science:

• Biochemistry
• Materials Science
• Nanotechnology

Background:

• Liposomes are versatile nanocarriers with potential in drug delivery and biomaterials.
• Formation of complex liposomal structures, such as multicompartment systems, remains a challenge.
• Understanding the factors governing liposome self-assembly is crucial for advanced applications.

Purpose of the Study:

• To investigate the structural features of complementary liposomes that promote multicompartment system formation.
• To identify factors enhancing the fusion and stability of these multicompartment liposomes.
• To elucidate the mechanism underlying the self-assembly of large, well-formed multicompartment liposomal aggregates.

Main Methods:

• Utilized PEGylated unilamellar liposomes with guanidinium moieties and complementary multilamellar liposomes with phosphate moieties.
• Incorporated PEGylated cholesterol into liposome bilayers to enhance surface PEGylation.
• Investigated liposome interactions, adhesion, and fusion dynamics using advanced microscopy and biophysical techniques.

Main Results:

• Demonstrated that molecular recognition between guanidinium and phosphate moieties initiates liposome interaction.
• Showed that enhanced PEGylation, achieved through PEGylated cholesterol, significantly promotes synergistic liposome fusion.
• Observed the formation of large, stable multicompartment systems through a proposed mechanism involving adhesion and lipid reorganization.

Conclusions:

• Molecular recognition and enhanced PEGylation are key factors for forming multicompartment liposomal systems.
• The synergistic fusion promoted by increased PEGylation leads to the formation of giant bilayer aggregates.
• This study provides insights into the self-assembly of complex liposomal architectures for potential advanced applications.