A Fluorescent Self-Reporting Vector with GSH Reduction Responsiveness for Nucleic Acid Delivery

Area of Science:

• Biotechnology
• Materials Science
• Gene Therapy

Background:

• Nonviral gene vectors require stimulus responsiveness and self-reporting for effective gene therapy.
• Developing efficient and safe gene delivery systems remains a challenge.

Purpose of the Study:

• To develop a nanosized, reduction-responsive cationic liposomal vector (DNS(Zn)) with fluorescence self-reporting properties.
• To evaluate its potential for gene delivery and gene silencing applications.

Main Methods:

• Synthesis of DNS(Zn) utilizing a naphthalimide-sulfonamide GSH-responsive group and a cyclen cationic headgroup.
• Fluorescent assays to assess GSH response and DNA release.
• Zeta potential measurements to evaluate DNA binding and cellular uptake.
• Transfection efficiency assays in HeLa cells using plasmid DNA and small interfering RNA (siRNA).

Main Results:

• DNS(Zn) exhibited a blue fluorescence signal (458 nm) upon glutathione (GSH) stimulation, indicating responsiveness.
• GSH response enhanced DNA release and improved cellular uptake compared to nonresponsive analogues.
• DNS(Zn) demonstrated significantly higher transfection efficiency in HeLa cells than its analogue and a commercial reagent.
• Effective delivery of both plasmid DNA and siRNA was achieved, with good gene silencing efficiency.

Conclusions:

• DNS(Zn) functions as an efficient nucleic acid delivery vector with reduction-responsive fluorescence self-reporting capabilities.
• The developed liposomal vector shows promise for targeted gene therapy, particularly in tumor cells.
• The combination of responsiveness, self-reporting, and efficient delivery broadens its application scope in gene therapy.