Bi-functional gold-coated magnetite composites with improved biocompatibility

Area of Science:

• Biomaterials Science
• Nanotechnology
• Gene Therapy

Background:

• Magnetic iron oxide nanoparticles (MNPs) are promising for targeted gene delivery.
• Surface modification is crucial for optimizing nanoparticle vector performance.
• Gold coating is explored to enhance MNP characteristics for biomedical applications.

Purpose of the Study:

• To investigate the impact of gold attachment on MNP vector properties.
• To evaluate cellular uptake, gene expression efficiency, and biocompatibility.
• To assess the potential of gold-modified MNPs for cellular therapy and imaging.

Main Methods:

• In vitro study using BHK21 cells.
• Synthesis and characterization of bare and gold-coated MNP vectors.
• Assessment of physical characteristics (morphology, surface charge).
• Evaluation of cellular uptake under magnetic field influence.
• Measurement of gene expression efficiency and cellular viability.
• Transmission electron microscopy for intracellular localization.

Main Results:

• Gold coating altered MNP morphology and surface charge.
• Cellular uptake increased with composite loading and was higher for gold-modified MNPs.
• Gold-coated MNPs maintained gene expression efficiency at higher loadings without toxicity.
• Bare MNPs showed toxicity at high loadings, reducing gene expression efficiency.
• Transmission electron microscopy confirmed nuclear localization of both vector types.

Conclusions:

• Gold modification enhances MNP vector performance for gene delivery.
• Gold-coated MNPs offer improved biocompatibility and sustained gene expression.
• These vectors show potential as dual-function agents for cellular therapy and intracellular imaging.