Plasmid DNA Delivery: Nanotopography Matters.

Area of Science:

• Biotechnology
• Materials Science
• Nanotechnology

Background:

• Plasmid DNA delivery is crucial for various bioapplications.
• Nonviral vectors are essential for introducing plasmid DNA into cells.
• Nanoparticle surface topography influences vector performance.

Purpose of the Study:

• To investigate the impact of silica nanoparticle nanotopography on plasmid DNA binding and transfection efficacy.
• To design novel silica-based nanovectors for efficient gene delivery.
• To understand the protective mechanisms of nanoparticle surface structures against nuclease degradation.

Main Methods:

• Synthesis of silica nanoparticles with diverse morphologies (rambutan-, raspberry-, flower-like).
• Characterization of nanoparticle nanotopography (spike-, hemisphere-, bowl-type subunits).
• Assessment of plasmid DNA binding capability and in vitro transfection efficacy.
• Evaluation of protection against nuclease degradation.

Main Results:

• Rambutan-like silica nanoparticles with spiky surfaces exhibited the highest plasmid DNA binding capacity.
• These spiky nanoparticles achieved a transfection efficacy of 88%, outperforming other tested morphologies and some commercial agents.
• The spiky surface structure provided continuous space for DNA binding via multivalent interactions and protected DNA from nuclease degradation, preventing transfection decay.

Conclusions:

• Nanotopography control of silica nanoparticles is a critical factor for enhancing gene delivery efficiency.
• Rambutan-like nanoparticles with spiky surfaces represent a promising nonviral vector for efficient and stable plasmid DNA delivery.
• The study offers insights into rational design principles for advanced nonviral gene delivery systems.