Partially Polymerized Phospholipid Vesicles for Efficient Delivery of Macromolecules

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery

Background:

• Cationic liposomal nanocarriers are promising for delivering nucleic acids and proteins.
• Conventional liposomes have limitations in intracellular delivery due to membrane flexibility.
• Polymerized liposomes offer a potential structural solution for enhanced stability and cargo protection.

Purpose of the Study:

• To develop and characterize novel block-polymerized bilayered vesicles for improved macromolecule delivery.
• To investigate the potential of partially polymerized liposomes (PPLs) to overcome limitations of conventional liposomes.
• To enhance the stability and loading capacity of nanocarriers for efficient intracellular delivery.

Main Methods:

• Synthesis of block-polymerized bilayered vesicles using DOTAP: DOPE: Diyne PC lipids.
• Application of a modified freeze-dry-rehydration technique for vesicle reassembly.
• Characterization of partially polymerized liposomal preparations (PPLs) for particle size, stability, and loading capacity.

Main Results:

• Successfully developed cationic partially polymerized liposomal preparations (PPLs) with mean particle size ranging from 150-300 nm.
• Demonstrated enhanced physicochemical stability and superior loading capacity compared to conventional liposomes.
• Showcased improved intracellular delivery of model RNAi and protein cargos using the developed PPLs.

Conclusions:

• Partially polymerized liposomes (PPLs) represent a promising advancement in nanocarrier technology for biomacromolecule delivery.
• The semi-rigid membrane structure of PPLs enhances stability and loading, crucial for effective intracellular transport.
• These findings support the potential of PPLs as superior vectors for RNA and protein therapeutics.