Redox-responsive polyanhydride micelles for cancer therapy

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Biodegradable polyanhydrides offer controlled drug release via surface erosion.
• Polyanhydride micelles as redox-responsive nanocarriers for drug delivery remain underexplored.

Purpose of the Study:

• To develop novel amphiphilic polyanhydride copolymers with disulfide bonds for self-assembly into redox-responsive micelles.
• To evaluate the drug release kinetics, cytotoxicity, and in vivo antitumor efficacy of these nanocarriers.

Main Methods:

• Synthesis of amphiphilic polyanhydride copolymer containing disulfide bonds.
• Self-assembly of copolymer into micelles and characterization of size and morphology.
• In vitro drug release studies under reducing and acidic conditions.
• In vitro cytotoxicity assays and in vivo antitumor studies in 4T1 tumor-bearing mice.

Main Results:

• Stable polyanhydride micelles (average diameter 69 nm) with a core-shell structure were successfully formed.
• Micelles demonstrated glutathione-triggered disassembly and achieved approximate zero-order drug release in a tumor-mimicking environment.
• Curcumin-loaded micelles exhibited potent in vitro cytotoxicity against cancer cells and superior in vivo antitumor activity compared to redox-insensitive micelles.

Conclusions:

• Novel redox-responsive polyanhydride micelles serve as efficient nanocarriers for enhanced drug delivery.
• The disulfide bond linkage enables triggered drug release in the tumor microenvironment, improving therapeutic outcomes.
• This study highlights the potential of polyanhydrides in developing advanced nanomedicine for cancer therapy.