Enzymatic multifunctional biodegradable polymers for pH- and ROS-responsive anticancer drug delivery

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Biodegradable block copolymers offer potential for drug delivery systems.
• Tumor microenvironments exhibit unique acidic pH and high reactive oxygen species (ROS) conditions.
• Developing stimuli-responsive nanoparticles is crucial for targeted drug release.

Purpose of the Study:

• To synthesize and characterize novel multifunctional biodegradable block copolymers (PEG-PMT).
• To investigate the self-assembly and stimuli-responsive behavior of PEG-PMT nanoparticles.
• To evaluate the efficacy and biosafety of drug-loaded PEG-PMT nanoparticles for cancer therapy.

Main Methods:

• Lipase-catalyzed copolymerization for PEG-PMT synthesis.
• Self-assembly in aqueous medium to form micellar nanoparticles.
• In vitro drug release studies under acidic and ROS conditions.
• In vivo anti-tumor efficacy studies in CT-26 tumor models.
• Biosafety assessment in normal organs (liver, kidney).

Main Results:

• Successful synthesis of amphiphilic PEG-PMT copolymers.
• PEG-PMT micelles demonstrated significant particle size increase in response to acidic pH and ROS.
• Synergistic drug release (over 85% docetaxel) triggered by combined stimuli.
• In vivo studies showed superior tumor growth inhibition (70%) compared to commercial formulation.
• Minimal toxicity observed in normal organs.

Conclusions:

• pH- and ROS-responsive PEG-PMT micelles are effective carriers for anti-cancer drugs.
• These nanoparticles enable controlled drug release at tumor intracellular sites.
• PEG-PMT nanoparticles exhibit promising biosafety profiles for therapeutic applications.