Calcium-dependent Cyto- and Genotoxicity of Nickel Metal and Nickel Oxide Nanoparticles in Human Lung Cells

Overview

Journal Part Fibre Toxicol

Publisher Biomed Central

Specialty Toxicology

Date 2018 Jul 19

PMID 30016969

Citations 36

Authors

Sebastiano Di Bucchianico

Anda R Gliga

Emma Akerlund

Sara Skoglund

Inger Odnevall Wallinder

Bengt Fadeel

Hanna L Karlsson

Affiliations

Soon will be listed here.

Abstract

Background: Genotoxicity is an important toxicological endpoint due to the link to diseases such as cancer. Therefore, an increased understanding regarding genotoxicity and underlying mechanisms is needed for assessing the risk with exposure to nanoparticles (NPs). The aim of this study was to perform an in-depth investigation regarding the genotoxicity of well-characterized Ni and NiO NPs in human bronchial epithelial BEAS-2B cells and to discern possible mechanisms. Comparisons were made with NiCl in order to elucidate effects of ionic Ni.

Methods: BEAS-2B cells were exposed to Ni and NiO NPs, as well as NiCl, and uptake and cellular dose were investigated by transmission electron microscopy (TEM) and inductively coupled plasma mass spectrometry (ICP-MS). The NPs were characterized in terms of surface composition (X-ray photoelectron spectroscopy), agglomeration (photon cross correlation spectroscopy) and nickel release in cell medium (ICP-MS). Cell death (necrosis/apoptosis) was investigated by Annexin V-FITC/PI staining and genotoxicity by cytokinesis-block micronucleus (cytome) assay (OECD 487), chromosomal aberration (OECD 473) and comet assay. The involvement of intracellular reactive oxygen species (ROS) and calcium was explored using the fluorescent probes, DCFH-DA and Fluo-4.

Results: NPs were efficiently taken up by the BEAS-2B cells. In contrast, no or minor uptake was observed for ionic Ni from NiCl. Despite differences in uptake, all exposures (NiO, Ni NPs and NiCl) caused chromosomal damage. Furthermore, NiO NPs were most potent in causing DNA strand breaks and generating intracellular ROS. An increase in intracellular calcium was observed and modulation of intracellular calcium by using inhibitors and chelators clearly prevented the chromosomal damage. Chelation of iron also protected against induced damage, particularly for NiO and NiCl.

Conclusions: This study has revealed chromosomal damage by Ni and NiO NPs as well as Ni ionic species and provides novel evidence for a calcium-dependent mechanism of cyto- and genotoxicity.

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