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Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
Published on: October 26, 2015
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Exposure to a Titanium Dioxide Product Alters DNA Methylation in Human Cells
Carlos Wells1, Marta Pogribna1, Arjun Sharmah2
1Division of Biochemical Toxicity, FDA/National Center for Toxicological Research, Jefferson, AR 72079, USA.
Nanomaterials (Basel, Switzerland)
|December 27, 2024
Summary
Titanium dioxide (TiO2) exposure impacts DNA methylation in human cells, affecting global methylation and specific gene promoters. This epigenotoxicity highlights the need for further risk assessment of TiO2 in consumer products.
Area of Science:
- Environmental Health
- Epigenetics
- Toxicology
Background:
- Titanium dioxide (TiO2) is widely used in consumer products, raising safety concerns due to reported toxicity.
- Epigenetic mechanisms, such as DNA methylation, play a crucial role in biological responses to environmental exposures.
Purpose of the Study:
- To investigate the epigenotoxic effects of titanium dioxide (TiO2) exposure on DNA methylation in human cell lines relevant to exposure.
- To assess the impact of TiO2 on global DNA methylation and specific gene promoter methylation.
Main Methods:
- Utilized Caco-2 (colorectal) and HepG2 (liver) human cell lines for TiO2 exposure studies.
- Assessed global DNA methylation using ELISA-based immunochemical analysis.
- Evaluated gene promoter methylation via EpiTect Methyl II Signature PCR Array and quantified gene expression using qRT-PCR.
Main Results:
- Observed a decrease in global DNA methylation in both Caco-2 and HepG2 cells following TiO2 exposure.
- Identified methylation changes in promoters of seven genes, including TP53 and BNIP3, across cell lines.
- Detected aberrant expression of DNA methyltransferases, MBD2, and UHRF1, correlating with methylation alterations.
Conclusions:
- TiO2 exposure demonstrably affects DNA methylation patterns in human colorectal and liver cells.
- Findings support the role of epigenetics in mediating TiO2's biological effects and toxicity.
- Epigenetic assessments are crucial for a comprehensive evaluation of TiO2's human health risks.
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