Dynamic reactions of liposomes

Area of Science:

• Biochemistry
• Materials Science
• Chemical Biology

Background:

• Dynamic chemical reactions on liposome surfaces are crucial for understanding biological membranes and creating responsive materials.
• Covalent and reversible reactions offer unique opportunities for controlling liposome behavior.

Purpose of the Study:

• To describe a novel covalent yet reversible reaction between liposomes.
• To explore the thioester exchange reaction for creating dynamic covalent networks in liposomes.

Main Methods:

• Investigated reversible thioester exchange between membrane-embedded amphiphilic thioesters and solution-phase dithiols.
• Observed liposome aggregation kinetics and reversibility.
• Developed a fluorescence anisotropy assay to monitor surface reactions.

Main Results:

• Thioester exchange resulted in covalent inter-liposomal cross-links and liposome aggregation.
• Liposome aggregation exhibited a lag phase and its rate depended on reactant concentrations.
• Liposome clusters could be dissociated by adding a monothiol, demonstrating reaction reversibility.

Conclusions:

• The formation of a dynamic covalent network of liposomes via thioester exchange is unprecedented.
• This approach provides a new strategy for designing responsive soft materials based on liposome self-assembly.