Highly efficient drug delivery systems based on functional supramolecular polymers: In vitro evaluation

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Developing advanced drug delivery systems is crucial for improving therapeutic efficacy and reducing side effects.
• Functional micelles offer potential as nanocarriers, but enhancing their stability and loading capacity remains a challenge.

Purpose of the Study:

• To create novel supramolecular polymeric micelles with enhanced properties for drug delivery.
• To investigate the self-complementary interactions for micelle formation and drug loading.
• To evaluate the in vitro performance of these micelles as anticancer drug carriers.

Main Methods:

• Living polymerization of functionalized thermoresponsive monomers to create micelles with hydrogen-bonded groups.
• Phase transitions and morphological studies to characterize micelle structure and stability.
• Incorporation and in vitro release studies of doxorubicin (DOX) as a model anticancer drug.
• Cytotoxicity assays using human liver carcinoma (HepG2) cells.

Main Results:

• Well-defined vesicle-like micelles were formed with controlled microstructure based on hydrogen bond strength.
• Micelles exhibited very low critical micellization concentration and high drug loading capacity (16.1%).
• DOX-loaded micelles demonstrated precise control over drug release rate and dose-dependent cytotoxicity against HepG2 cells.
• Efficient endocytosis of DOX-loaded micelles by cancer cells was observed.

Conclusions:

• A novel approach using self-complementary hydrogen-bonding interactions led to the development of stable, thermo-responsive supramolecular polymeric micelles.
• These micelles show significant potential as advanced nanocarriers for effective anticancer drug delivery, improving therapeutic efficacy and safety.
• The findings pave the way for next-generation multifunctional nanocarriers in cancer therapy.