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pH-Responsive Micellar Nanoparticles for the Delivery of a Self-Amplifying ROS-Activatable Prodrug.
Vinod K Kannaujiya1,2,3, Yijie Qiao1,2,3, Rakib H Sheikh1,2,3
1School of Chemical Engineering, University of New South Wales, Sydney 2052, New South Wales, Australia.
Biomacromolecules
|February 20, 2024
Summary
This study developed a novel nanoparticle delivery system for the anticancer drug camptothecin (CPT). The system enhances CPT
Area of Science:
- Nanotechnology in Drug Delivery
- Biopolymer Synthesis and Application
- Anticancer Therapeutics
Background:
- Camptothecin (CPT) is a potent anticancer drug with limited therapeutic efficacy due to poor solubility and severe side effects.
- Nanoparticle (NP) formulations offer a promising strategy to improve drug delivery and therapeutic outcomes.
- Reactive oxygen species (ROS) are implicated in cancer progression and can be targeted for therapeutic intervention.
Purpose of the Study:
- To enhance the therapeutic efficacy of camptothecin (CPT) using a novel amphiphilic biopolymer-based nanoparticle (NP) formulation.
- To design a self-amplifying, ROS-responsive dimeric prodrug of CPT for targeted cancer treatment.
- To develop a pH-responsive block copolymer for efficient NP delivery and controlled drug release.
Main Methods:
- Synthesis of a dimeric prodrug of CPT (DCPT(TA)) by incorporating cinnamaldehyde into a ROS-cleavable thioacetal linker.
- Preparation of a pH-responsive block copolymer (acetalated dextran-b-poly(2-ethyl-2-oxazoline), AcDex-b-PEOz) for NP self-assembly.
- Characterization of micellar NPs for prodrug loading, release kinetics, and cellular uptake in HeLa cells.
Main Results:
- The amphiphilic AcDex-b-PEOz copolymer self-assembled into micellar NPs with high DCPT(TA) loading capacity.
- DCPT(TA)-loaded NPs exhibited rapid prodrug release under acidic conditions and induced intracellular ROS generation.
- Cellular uptake by HeLa cells led to accelerated prodrug activation and significantly enhanced cytotoxicity compared to CPT alone.
Conclusions:
- The developed ROS-responsive dimeric prodrug and pH-responsive NP system effectively enhances camptothecin's anticancer activity.
- This prodrug delivery strategy demonstrates significant potential for improving cancer treatment outcomes.
- The combination of targeted drug release and ROS-mediated activation offers a novel approach in anticancer therapy.
