Ultrasensitive pH Triggered Charge/Size Dual-Rebound Gene Delivery System

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Therapy

Background:

• Developing efficient and safe gene delivery systems is crucial for effective cancer therapy.
• Existing systems often face challenges with cytotoxicity, stability, and targeted delivery.
• pH-responsive systems offer potential for targeted drug release in tumor microenvironments.

Purpose of the Study:

• To develop an ultrasensitive, pH-triggered, dual-rebound gene delivery system for enhanced tumor treatment.
• To utilize a facile, green, and fast construction method for clinical applicability.
• To evaluate the in vitro and in vivo performance of the developed gene delivery system.

Main Methods:

• Complexation of therapeutic genes with polyethylenimine (PEI) and poly-l-glutamate (PLG).
• In situ tightening of complexes using aldehyde-modified polyethylene glycol (PEG) via Schiff base reaction.
• In vitro and in vivo experiments to assess gene delivery, stability, cytotoxicity, and anti-tumor efficacy.

Main Results:

• The gene delivery system demonstrated pH-triggered cleavage of Schiff base bonds, releasing the therapeutic gene in acidic tumor environments.
• PEG shielding reduced cytotoxicity, improved system stability, and prolonged circulation time.
• Dual charge and size rebound significantly enhanced tumor cell uptake efficiency.
• Effective treatment of CT26 tumors in mice with superior anti-tumor efficacy was achieved.

Conclusions:

• The developed pH-triggered, dual-rebound gene delivery system is a facile, efficient, and promising platform for cancer therapy.
• The system's tunable properties, reduced cytotoxicity, and enhanced tumor cell uptake contribute to its therapeutic potential.
• This strategy holds significant promise for future clinical applications in cancer treatment.