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The size-dependent genotoxic potentials of titanium dioxide nanoparticles to endothelial cells.
Liao, Fen; Chen, Lingying; Liu, Yuanfeng; Zhao, Dongting; Peng, Wenyi; Wang, Wuxiang; Feng, Shaolong.
Afiliación
  • Liao F; The School of Public Health, University of South China, Hengyang, China.
  • Chen L; The First Affiliated Hospital, University of South China, Hengyang, China.
  • Liu Y; The School of Public Health, University of South China, Hengyang, China.
  • Zhao D; The School of Public Health, University of South China, Hengyang, China.
  • Peng W; The School of Public Health, University of South China, Hengyang, China.
  • Wang W; The School of Public Health, University of South China, Hengyang, China.
  • Feng S; The State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China.
Environ Toxicol ; 34(11): 1199-1207, 2019 Nov.
Article en En | MEDLINE | ID: mdl-31294929
Despite intensive research activities, there are still many major knowledge gaps over the potential adverse effects of titanium dioxide nanoparticles (TiO2 -NPs), one of the most widely produced and used nanoparticles, on human cardiovascular health and the underlying mechanisms. In the present study, alkaline comet assay and cytokinesis-block micronucleus test were employed to determine the genotoxic potentials of four sizes (100, 50, 30, and 10 nm) of anatase TiO2 -NPs to human umbilical vein endothelial cells (HUVECs) in culture. Also, the intracellular redox statuses were explored through the measurement of the levels of reactive oxygen species (ROS) and reduced glutathione (GSH) with kits, respectively. Meanwhile, the protein levels of nuclear factor erythroid 2-related factor 2 (Nrf2) were also detected by western blot. The results showed that at the exposed levels (1, 5, and 25 µg/mL), all the four sizes of TiO2 -NPs could elicit an increase of both DNA damage and MN frequency in HUVECs in culture, with a positive dose-dependent and negative size-dependent effect relationship (T100 < T50 < T30 < T10). Also, increased levels of intracellular ROS, but decreased levels of GSH, were found in all the TiO2 -NP-treated groups. Intriguingly, a very similar manner of dose-dependent and size-dependent effect relationship was observed between the ROS test and both comet assay and MN test, but contrary to that of GSH assay. Correspondingly, the levels of Nrf2 protein were also elevated in the TiO2 -NP-exposed HUVECs, with an inversely size-dependent effect relationship. These findings indicated that induction of oxidative stress and subsequent genotoxicity might be an important biological mechanism by which TiO2 -NP exposure would cause detrimental effects to human cardiovascular health.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Titanio / Daño del ADN / Nanopartículas del Metal Límite: Humans Idioma: En Revista: Environ Toxicol Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Titanio / Daño del ADN / Nanopartículas del Metal Límite: Humans Idioma: En Revista: Environ Toxicol Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos