Multifunctional Mixed Micelles Cross-Assembled from Various Polyurethanes for Tumor Therapy

Area of Science:

• Polymer chemistry and materials science
• Nanotechnology and drug delivery
• Biomedical engineering

Background:

• Developing multifunctional drug delivery systems requires effective synthetic strategies for polymer preparation.
• Current methods face challenges in creating complex nanocarriers with multiple functionalities.
• There is a need for advanced nanocarriers that enable targeted delivery and controlled release of therapeutic agents.

Purpose of the Study:

• To develop a unique protocol for preparing multifunctional micelles using a cross-assembly process.
• To incorporate specific functional groups (acid-sensitive hydrazone, folic acid, gemini quaternary ammonium) for enhanced targeting and cell uptake.
• To evaluate the drug-loading capacity, controlled release, in vivo biodistribution, and antitumor efficacy of the developed micelles.

Main Methods:

• Synthesized three distinct functional polyurethanes with acid-sensitive hydrazone, folic acid, and gemini quaternary ammonium (GQA) ligands.
• Utilized a cross-assembly process to create multifunctional mixed micelles (GFHPMs).
• Characterized GFHPMs for particle size, zeta potential, structure, drug loading, and in vitro release kinetics. Evaluated in vivo biodistribution and antitumor effects.

Main Results:

• GFHPMs exhibited tunable particle sizes, a unique three-order-layer cross-assemble structure, and improved drug-loading content.
• Controlled drug release was observed under acidic conditions, characteristic of tumor microenvironments.
• Folate and GQA ligands demonstrated a synergistic effect, significantly enhancing cell uptake.
• In vivo studies showed GFHPMs penetrated tumor depths, achieving maximum drug concentrations and reducing tumor volumes by fivefold compared to blank micelles.

Conclusions:

• The proposed cross-assembly protocol provides an effective route for synthesizing multifunctional nanocarriers.
• GFHPMs demonstrate potential for targeted tumor delivery and programmed intracellular drug release.
• This approach offers a promising strategy for developing advanced nanomedicines for cancer therapy.