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Oxidative damage and OGG1 expression induced by a combined effect of titanium dioxide nanoparticles and lead acetate in human hepatocytes.

Authors :
Du, Hairong
Zhu, Xiaoling
Fan, Chuangang
Xu, Song
Wang, Youjie
Zhou, Yikai
Source :
Environmental Toxicology; Oct2012, Vol. 27 Issue 10, p590-597, 8p
Publication Year :
2012

Abstract

Titanium dioxide (TiO<subscript>2</subscript>) is a widely used nanomaterial that can cause biological damage through oxidative stress. At low concentrations, TiO<subscript>2</subscript> can interact with lead acetate (PbAc) to produce different toxic responses, compared with TiO<subscript>2</subscript> or PbAc alone. In this study, we utilized the following as indicators of toxic responses in human embryo hepatocytes (L02): reactive oxygen species (ROS), reduced glutathione (GSH), superoxide dismutase (SOD), and the DNA adducts 8-hydroxydeoxyguanosine (8-OHdG) and 8-oxoguanine DNA glycosylase homolog 1 (OGG1). These were used to evaluate the oxidative stress of TiO<subscript>2</subscript> (at 0.001, 0.01, 0.1, 1, and 10 μg mL<superscript>−1</superscript>) mixed with PbAc (1 μg mL<superscript>−1</superscript>) on L02 cells without photoactivation. Compared with the negative control (1‰ dimethyl sulfoxide), TiO<subscript>2</subscript> mixed with PbAc induced increased release of ROS (at 0.001, 0.01, 0.1, 1, 10 μg mL<superscript>−1</superscript> TiO<subscript>2</subscript>), intracellular SOD activity (at 0.1 and 0.01 μg mL<superscript>−1</superscript> TiO<subscript>2</subscript>), GSH levels (at 0.01-1 μg mL<superscript>−1</superscript> TiO<subscript>2</subscript>), 8-OHdG levels (at 1 and 10 μg mL<superscript>−1</superscript> TiO<subscript>2</subscript>), OGG1 expression (at 0.001-1 μg mL<superscript>−1</superscript> TiO<subscript>2</subscript>), and cytotoxicity (at 0.1, 1, and 10 μg mL<superscript>−1</superscript> TiO<subscript>2</subscript>) in L02 cells. There were no significant changes in ROS, GSH, SOD, 8-OHdG, or OGG1 levels when L02 cells were treated with TiO<subscript>2</subscript> alone or PbAc alone. These findings indicate that TiO<subscript>2</subscript> and PbAc in combination induce cytotoxicity and oxidative stress in L02 cells in the absence of photoactivation. © 2011 Wiley Periodicals, Inc. Environ Toxicol, 2012. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
15204081
Volume :
27
Issue :
10
Database :
Complementary Index
Journal :
Environmental Toxicology
Publication Type :
Academic Journal
Accession number :
79958977
Full Text :
https://doi.org/10.1002/tox.20682