Enhancing nucleic acid delivery with ultrasound and microbubbles

Area of Science:

• Biomedical Engineering
• Molecular Biology
• Drug Delivery Systems

Background:

• Effective in vivo gene therapy requires targeted delivery of nucleic acids to specific cells.
• Current gene delivery methods face challenges in achieving precise tissue targeting and minimizing off-target effects.
• Targeted delivery is crucial for therapeutic efficacy and patient safety in gene therapy applications.

Purpose of the Study:

• To explore the potential of ultrasound and microbubbles for targeted nucleic acid delivery.
• To investigate the mechanism by which microbubbles facilitate cellular and tissue penetration of genetic material.
• To evaluate this novel approach as a method for enhancing gene delivery efficiency in vivo.

Main Methods:

• Utilized microbubbles (gas-filled spheres with stabilizing shells) as carriers for nucleic acids.
• Applied high-intensity ultrasound to induce microbubble oscillation, expansion, compression, and eventual implosion.
• Investigated ultrasound-mediated microbubble fragmentation to generate shockwaves and microjets for permeabilizing cell membranes and blood vessels.
• Examined methods for mixing nucleic acids with microbubbles or loading them onto microbubble surfaces (e.g., via lipoplexes).

Main Results:

• Ultrasound-induced microbubble implosion generates localized shockwaves and microjets.
• These physical forces temporarily permeabilize cell membranes and blood vessels, creating pathways for molecule extravasation.
• Nucleic acids, either mixed or loaded onto microbubbles, can be released and delivered to target regions upon microbubble fragmentation.
• This method allows for the targeted delivery of nucleic acids into cells or surrounding tissues within the ultrasound-exposed area.

Conclusions:

• Ultrasound and microbubbles represent a promising strategy for targeted in vivo gene and drug delivery.
• The ultrasound-mediated permeabilization mechanism enhances the accessibility of nucleic acids to target cells.
• This technique holds potential for improving the precision and efficacy of gene therapy by directing payloads to specific tissues.