Genospheres: self-assembling nucleic acid-lipid nanoparticles suitable for targeted gene delivery.

Area of Science:

• Biotechnology
• Nanomedicine
• Materials Science

Background:

• Effective delivery of nucleic acids is crucial for gene therapy and research.
• Developing stable, targeted, and efficient delivery vehicles remains a challenge.

Purpose of the Study:

• To describe a novel method for assembling stable, size-uniform cationic lipid-nucleic acid nanoparticles (Genospheres).
• To evaluate the DNA protection, storage stability, and target specificity of Genospheres.
• To demonstrate the potential of Genospheres as immunotargeted nucleic acid delivery vehicles.

Main Methods:

• Genospheres were assembled from a water/organic solvent monophase, followed by solvent removal.
• DNA encapsulation efficiency was assessed using a DNA intercalating dye.
• Storage stability was tested under various conditions, including lyophilization.
• Target specificity was achieved by incorporating an anti-HER2 antibody-lipopolymer conjugate.

Main Results:

• Stable, homogenous nanoparticles (70-100 nm) were formed with high DNA incorporation efficiency (>85%).
• Encapsulated DNA showed low accessibility to intercalating dye, indicating good protection.
• Genospheres exhibited excellent storage stability, even after lyophilization and reconstitution.
• Targeted Genospheres demonstrated >100-fold specificity for HER2-overexpressing cancer cells with minimal impact on transfection activity.

Conclusions:

• A scalable method for producing stable, immunotargeted nucleic acid nanoparticles (Genospheres) was established.
• Genospheres offer a promising platform for specific gene delivery with high transfection efficiency.
• The developed nanoparticles are suitable for various storage conditions, enhancing their practical utility.