Polymerized phosphatidylcholine vesicles as drug carriers

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Drug Delivery Systems

Background:

• Development of stable and effective drug delivery systems is crucial for therapeutic advancements.
• Polymeric vesicles offer potential advantages over traditional liposomes due to enhanced stability.
• Controlled release of lipophilic drugs in specific gastrointestinal regions remains a challenge.

Purpose of the Study:

• To synthesize and characterize novel polymerized ammonium and phosphatidylcholine vesicles.
• To evaluate the stability and drug-loading capacity of these vesicles.
• To assess the potential of these vesicles as carriers for controlled oral drug delivery.

Main Methods:

• Synthesis of polymerized vesicles via poly(methacrylate) and poly(disulfide) formation.
• Functionalization and conjugation of polymeric liposomes with alpha-chymotrypsin.
• Stability testing against physical perturbation, organic solvents, detergents, and lyophilization.
• In vitro assessment of lipophilic substance retention in the presence of detergents.
• In vivo toxicity assessment via intravenous administration to outbred mice.

Main Results:

• Successfully synthesized stable polymerized ammonium and phosphatidylcholine vesicles.
• Demonstrated high stability of vesicles towards physical stress, solvents, detergents, and lyophilization.
• Vesicles retained significant amounts of lipophilic substances even with high detergent concentrations.
• Photopolymerized liposomes showed no acute toxicity upon intravenous administration in mice.
• Functionalized liposomes were successfully conjugated with alpha-chymotrypsin.

Conclusions:

• Photopolymerized liposomes exhibit exceptional stability, making them suitable for pharmaceutical manufacturing.
• Their ability to retain lipophilic substances in challenging conditions suggests effective oral drug delivery potential.
• The demonstrated lack of acute toxicity supports their viability as therapeutic carriers.
• These novel liposomes represent a promising platform for controlled delivery of specific therapeutic agents, particularly via the oral route.