Acid-activated nonviral peptide vector for gene delivery

Area of Science:

• Biotechnology
• Gene Therapy
• Nanomedicine

Background:

• Nonviral vectors are crucial for gene therapy, but efficiency and safety remain challenges.
• Cell-penetrating peptides (CPPs) show promise for nucleic acid delivery.
• Current research often prioritizes transfection efficiency over vector specificity and toxicity.

Purpose of the Study:

• To develop a novel nonviral vector with enhanced efficiency and safety for gene therapy.
• To investigate the properties of a modified cell-penetrating peptide, stearyl-TH.
• To evaluate the pH-dependent DNA binding, cellular uptake, transfection efficiency, and toxicity of stearyl-TH.

Main Methods:

• Construction of the stearyl-TH vector by conjugating a stearyl moiety to the acid-activated CPP TH.
• Assessment of DNA binding and complex formation under acidic and physiological pH conditions.
• Evaluation of cellular uptake, transfection efficiency, and cytotoxicity of the stearyl-TH/plasmid complexes.

Main Results:

• Stearyl-TH effectively condensed plasmids into nanoparticles under acidic conditions.
• Enhanced cellular uptake and transfection efficiencies were observed for stearyl-TH complexes at acidic pH.
• Stearyl-TH demonstrated negligible DNA binding and transfection at physiological pH.
• No significant toxicity was observed for stearyl-TH or its complexes at physiological pH.

Conclusions:

• Stearyl-TH exhibits pH-dependent nucleic acid delivery capabilities, with high efficiency under acidic conditions.
• The developed vector shows a favorable safety profile at physiological pH, indicating reduced toxicity.
• Stearyl-TH represents a promising candidate for developing safer and more efficient gene therapy vectors.