Effects of titanium dioxide nanoparticle aggregate size on gene expression

Area of Science:

• Nanotechnology
• Materials Science
• Toxicology

Background:

• Nanoparticle aggregation significantly influences the biological activity and cytotoxicity of materials like titanium dioxide (titania).
• The specific impact of titanium dioxide nanoparticle aggregate size on cellular responses remains incompletely understood.
• Understanding these size-dependent effects is crucial for assessing nanoparticle safety and applications.

Purpose of the Study:

• To investigate the relationship between titanium dioxide (titania) nanoparticle aggregate size and cellular biological activity.
• To compare the cytotoxic effects and biomarker expression of small (166 nm) versus large (596 nm) titania aggregates.
• To elucidate the role of aggregate size in titania nanoparticle-induced cellular responses.

Main Methods:

• Preparation and separation of two distinct titanium dioxide (titania) aggregate sizes (166 nm and 596 nm) via centrifugation.
• Analysis of cellular biological activity, including cell viability.
• Gene expression analysis of biomarkers related to stress, inflammation, and cytotoxicity.

Main Results:

• Larger titanium dioxide (titania) aggregates (596 nm) exhibited a more pronounced effect on cell viability compared to smaller aggregates (166 nm).
• Significant differences in biomarker expression related to stress, inflammation, and cytotoxicity were observed between the two aggregate size groups.
• The study confirmed a correlation between titanium dioxide aggregate size and the magnitude of cellular effects.

Conclusions:

• Particle aggregate size is a critical determinant of titanium dioxide (titania) nanoparticle cytotoxicity.
• Larger titania aggregates induce greater cellular stress and inflammatory responses.
• These findings underscore the importance of considering aggregate size in the toxicological assessment of nanoparticles.