A Method for Using Cell-Penetrating Peptides for Loading Plasmid DNA into Secreted Extracellular Vesicles

Area of Science:

• Biotechnology
• Molecular Biology
• Nanomedicine

Background:

• Plasmid DNA (pDNA) therapeutics face challenges due to low bioavailability and high toxicity.
• Extracellular vesicles (EVs) are promising biocompatible carriers for nucleic acid delivery.
• Existing methods for loading pDNA into EVs have shown limited success.

Purpose of the Study:

• To develop a novel and efficient method for loading pDNA into EVs.
• To evaluate the transfection efficacy and bioavailability of pDNA delivered via EVs.
• To assess the in vivo toxicity of pDNA-loaded EVs compared to traditional delivery methods.

Main Methods:

• Loading EVs with pDNA via transient transfection using cell-penetrating peptides (CPPs).
• Quantifying reporter gene expression (luciferase) in recipient cells.
• Evaluating in vivo toxicity and therapeutic effects of pDNA-loaded EVs.

Main Results:

• A 10^4-fold increase in luciferase expression was observed in recipient cells.
• Demonstrated high transfection efficacy and bioavailability of encapsulated nucleic acids.
• In vivo studies showed reduced toxicity of pDNA-loaded EVs compared to traditional nucleic acid delivery.

Conclusions:

• Transient transfection with CPPs provides an effective method for pDNA loading into EVs.
• pDNA-loaded EVs offer enhanced bioavailability and transfection efficiency for in vivo applications.
• EVs serve as safe and effective native delivery vehicles, mitigating the toxicity of pDNA therapeutics.