Redox-dual-sensitive multiblock copolymer vesicles with disulfide-enabled sequential drug delivery.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cancer Therapeutics

Background:

• Multiblock copolymer vesicles offer potential for drug delivery.
• Dual-redox responsive systems are needed for controlled release.
• Sequential delivery can enhance combination cancer therapy.

Purpose of the Study:

• To develop a straightforward sequential drug delivery system using disulfide-enriched multiblock copolymer vesicles.
• To achieve dual-redox responsive release of hydrophilic and hydrophobic drugs.
• To evaluate the improved combination antitumor effect compared to concurrent delivery.

Main Methods:

• Fabrication of disulfide-enriched multiblock copolymer vesicles.
• Encapsulation of hydrophilic doxorubicin hydrochloride (DOX·HCl) and hydrophobic paclitaxel (PTX).
• Assessment of drug release under oxidative and reductive conditions.
• In vitro/in vivo evaluation of antitumor efficacy.

Main Results:

• The nanocarrier demonstrated sequential release of DOX·HCl and PTX under specific redox conditions.
• Spatiotemporal control of drug release was achieved.
• Enhanced combination antitumor effect was observed compared to concurrent delivery.

Conclusions:

• The developed nanocarrier provides a simple and smart platform for sequential drug delivery.
• Dual-redox responsiveness enables controlled release of different drug types.
• This system shows promising applications for advanced cancer therapy.