Gelucire-stabilized nanoparticles as a potential DNA delivery system

Area of Science:

• Biomaterials Science
• Gene Therapy
• Nanotechnology

Background:

• Gene delivery systems are crucial for therapeutic applications but often face challenges with toxicity and stability.
• Nanoparticles (NPs) offer a potential solution, with biocompatible materials like Gelucire® 44/14 and cetyl alcohol being explored for NP preparation.

Purpose of the Study:

• To modify nanoparticle preparation for efficient plasmid DNA (pDNA) loading and assess their potential as gene delivery vehicles.
• To evaluate the impact of different cationic lipids and surfactants on pDNA loading, stability, and in vitro transfection efficiency.

Main Methods:

• Nanoparticles were prepared using Gelucire® 44/14 and cetyl alcohol, with modifications for pDNA loading via inclusion of cationic lipids (DOTAP, DDAB) or cationic surfactants (CTAB).
• Colloidal stability and pDNA loading efficiency were assessed using gel permeation chromatography.
• Protection of pDNA from DNase digestion and in vitro transfection efficiency in HepG2 cells (measuring luciferase expression) were evaluated.

Main Results:

• All NP formulations effectively protected pDNA from DNase digestion compared to pDNA alone.
• DOTAP-NPs and DDAB-NPs showed higher transfection efficiency in HepG2 cells than CTAB-NPs.
• CTAB-NPs, despite simpler loading, exhibited elevated cytotoxicity, likely due to CTAB concentration.

Conclusions:

• Gelucire-stabilized nanoparticles, particularly those incorporating DOTAP, represent a promising platform for gene delivery.
• Formulation strategies significantly influence nanoparticle cytotoxicity and transfection efficiency.
• Further optimization is needed to balance efficacy and safety for clinical gene delivery applications.