Titanium Dioxide Particle Type and Concentration Influence the Inflammatory Response in Caco-2 Cells

Area of Science:

• Nanotechnology
• Toxicology
• Gastroenterology

Background:

• Titanium dioxide (TiO₂) nanoparticles are prevalent in food products as white colorants.
• The gastrointestinal effects of ingested TiO₂ nanoparticles are not fully understood.
• Understanding TiO₂ nanoparticle toxicity is crucial for food safety.

Purpose of the Study:

• To investigate the impact of different TiO₂ nanoparticle types on human intestinal cells and immune cells.
• To assess cytotoxicity, reactive oxygen species production, and inflammatory markers.

Main Methods:

• Exposure of Caco-2 cells and THP-1 macrophages to five distinct TiO₂ nanoparticles (varying crystal structure and size).
• Assessed cellular viability, reactive oxygen species (ROS) generation, and cytokine expression (IL-1β, IL-8).

Main Results:

• Anatase TiO₂ nanoparticles reduced viability in both cell types after prolonged exposure.
• TiO₂ exposure generally increased reactive oxygen species production.
• Anatase TiO₂ induced higher levels of interleukin-1β and interleukin-8, indicating inflammation.

Conclusions:

• Anatase TiO₂ nanoparticles exhibit greater inflammatory potential compared to other forms.
• Further in vivo studies are necessary to confirm the relevance of these findings for ingested TiO₂.
• Potential hazards of ingested TiO₂ nanoparticles warrant further investigation.