Cationic polydiacetylene micelles for gene delivery.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Molecular Biology

Background:

• Cationic surfactants form lipoplexes with plasmid DNA for gene delivery.
• Their detergent properties and toxicity limit their application as gene delivery vectors.
• Developing safer and more effective non-viral gene delivery systems is crucial.

Purpose of the Study:

• To synthesize and characterize novel cationic surfactants incorporating a diacetylene motif in their hydrophobic chains.
• To investigate the photopolymerization of these surfactants into stable nanostructures.
• To evaluate the efficacy of the resulting lipoplexes for plasmid DNA delivery and gene expression.

Main Methods:

• Synthesis of cationic surfactants with diacetylene moieties.
• Photopolymerization of surfactant micelles into nanospheres using UV irradiation.
• Formation of lipoplexes via electrostatic interaction with plasmid DNA (pCMV-Luciferase).
• In vitro transfection assays to measure gene expression (luciferase activity).

Main Results:

• Diacetylenic cationic surfactants formed 9 nm micelles that were photopolymerized into 40 nm spheres.
• Lipoplexes of 45 nm were formed with plasmid DNA at a N/P ratio of 5.
• In vitro transfection achieved high gene expression levels (>10(10) RLU/mg protein), comparable to a commercial gene delivery system.

Conclusions:

• Incorporating diacetylene motifs into cationic surfactants enables photopolymerization into stable nanostructures.
• These novel materials form efficient lipoplexes for gene delivery with significant in vitro transfection activity.
• This class of molecules represents a promising new platform for developing advanced in vivo gene delivery vectors.