Gold nanoparticles as a versatile platform for optimizing physicochemical parameters for targeted drug delivery

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Materials Science

Background:

• Targeted drug delivery systems require optimization of both targeting ligands and nanoparticle carrier properties.
• Gold nanoparticles offer a versatile platform for developing novel drug delivery vehicles.

Purpose of the Study:

• To develop and validate a versatile platform for systematically modifying gold nanoparticles.
• To screen nanoparticle formulations for efficient hepatocyte-targeted delivery in vivo.
• To identify key design parameters influencing targeted delivery efficiency.

Main Methods:

• Gold nanoparticles were modified with thiolated polymers, including polyethylene glycol-thiol (PEG-thiol) and galactose-PEG-thiol.
• Nanoparticle formulations with varying particle size, surface charge, hydrophilicity, and galactose ligand density were prepared.
• In vivo studies were conducted to evaluate the hepatocyte-targeting efficiency of different nanoparticle formulations.

Main Results:

• Nanoparticle size and the density of galactose ligands were identified as critical factors significantly impacting targeting efficiency.
• The developed platform allowed for independent and systematic variation of nanoparticle design parameters.
• Modified gold nanoparticles demonstrated suitability as a model for nanoparticle-based gene carriers.

Conclusions:

• The versatile gold nanoparticle platform facilitates the systematic optimization of design parameters for targeted drug delivery.
• Nanoparticle size and specific ligand functionalization (galactose) are crucial for achieving efficient hepatocyte targeting.
• This approach is valuable for determining optimal design strategies for advanced drug delivery systems.