Self-assembled PAA-based nanoparticles as potential gene and protein delivery systems

Area of Science:

• Materials Science
• Biotechnology
• Polymer Chemistry

Background:

• Biocompatible nanoparticles are crucial for drug and gene delivery systems.
• Synthetic polymers offer tunable properties for nanoparticle design.
• Layer-by-layer assembly is a versatile method for creating complex nanostructures.

Purpose of the Study:

• To synthesize and characterize novel biocompatible nanoparticles using layer-by-layer assembly.
• To investigate the influence of polymer type and layer number on nanoparticle properties.
• To evaluate the cytotoxicity and potential of these nanoparticles for therapeutic delivery.

Main Methods:

• Layer-by-layer assembly of oppositely charged polyamidoamine polymers.
• Quantification of particle size, surface charge, and internal chain mobility.
• Cytotoxicity assays using epithelia and murine cell lines.
• Simulation of nanoparticle dissolution using surfactants.

Main Results:

• Stable nanoparticles were successfully prepared using strongly, oppositely charged polymers.
• Particle characteristics (size, charge, mobility) were dependent on polymer type and layer number.
• Nanoparticles demonstrated significantly lower cytotoxicity compared to polyethyleneimine controls.
• Weakly charged polymers resulted in less stable nanoparticle formation.

Conclusions:

• Modularly designed synthetic polyamidoamine nanoparticles are promising carriers for drug and gene delivery.
• The observed low cytotoxicity supports their potential for in vivo applications.
• Optimization of polymer charge and layer assembly is key for stable nanoparticle formation.