Subtle cytotoxicity and genotoxicity differences in superparamagnetic iron oxide nanoparticles coated with various...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Toxicology

Background:

• Superparamagnetic iron oxide nanoparticles (SPIONs) are promising for medical imaging and drug delivery.
• Optimized size and surface modification are crucial for SPIONs' biomedical applications.
• The biocompatibility and biofunctionality of SPIONs with diverse surface chemistries require further investigation.

Purpose of the Study:

• To evaluate the cytotoxicity and genotoxicity of SPIONs with different sizes and surface functional groups.
• To understand how surface modifications influence SPIONs' cellular interactions and potential toxicity.
• To provide insights for safe and effective SPION design in biomedical applications.

Main Methods:

• SPIONs of ~10 nm and 100-150 nm sizes were prepared and surface-modified with hydroxyl, carboxylic, and amine groups.
• Cytotoxicity was assessed using mitochondrial activity (MTT assay) and membrane integrity (LDH assay) in L-929 fibroblasts.
• Genotoxicity was evaluated by measuring reactive oxygen species (ROS) and DNA damage (Comet assay).

Main Results:

• SPIONs with different surface functional groups and sizes induced varying degrees of cytotoxicity and genotoxicity.
• Cellular responses, including mitochondrial activity, ROS production, and DNA stability, were significantly influenced by SPION characteristics.
• Slight but meaningful changes in cytotoxicity and genotoxicity were observed, highlighting the importance of surface properties.

Conclusions:

• The functional groups and sizes of SPIONs are critical determinants of their cellular responses and toxicity.
• Surface modification plays a key role in modulating the biocompatibility and biofunctionality of SPIONs.
• These findings are valuable for future research in SPION bioconjugation, drug delivery, and cancer targeting.