A peptide-based vector for efficient gene transfer in vitro and in vivo

Area of Science:

• Gene Therapy
• Nanomedicine
• Biotechnology

Background:

• Nonviral delivery vehicles are crucial for nucleic acid therapeutics.
• Cell-penetrating peptides (CPPs) facilitate cellular entry but often trap cargo in endosomes.
• Stearylated CPPs, like transportan 10 (TP10), enhance oligonucleotide delivery by promoting endosomal escape.

Purpose of the Study:

• To investigate the potential of stearyl-TP10 as a nonviral vector for plasmid DNA delivery.
• To assess the transfection efficiency and cellular uptake of stearyl-TP10/plasmid nanoparticles.
• To evaluate the in vivo gene delivery efficacy and toxicity of stearyl-TP10/plasmid complexes.

Main Methods:

• Formation and characterization of stearyl-TP10/plasmid nanoparticles.
• In vitro transfection assays in various cell types, including primary cells.
• Comparison of transfection efficiency with unmodified CPPs and Lipofectamine 2000 (LF2000).
• In vivo gene delivery studies via intramuscular (i.m.) and intradermal (i.d.) administration in mice.

Main Results:

• Stearyl-TP10 efficiently formed stable nanoparticles with plasmid DNA.
• These nanoparticles demonstrated ubiquitous cellular entry and significantly higher gene expression compared to controls.
• Transfection efficacy approached that of LF2000, but without associated toxicity.
• Stearyl-TP10/plasmid nanoparticles were nonimmunogenic and showed efficient in vivo gene delivery with no observed toxicity.

Conclusions:

• Stearyl-TP10 is a potent nonviral vector for plasmid DNA delivery, overcoming endosomal entrapment.
• It offers a safer alternative to existing transfection agents like LF2000.
• Its nonimmunogenic nature and demonstrated in vivo efficacy position it as a promising candidate for gene therapy applications.