Iron-related toxicity of single-walled carbon nanotubes and crocidolite fibres in human mesothelial cells investigated by Synchrotron XRF microscopy

Francesca Cammisuli, Silvia Giordani, Alessandra Gianoncelli, Clara Rizzardi, Lucia Radillo, Marina Zweyer, Tatiana Da Ros, Murielle Salomé, Mauro Melato, Lorella Pascolo

Research output: Contribution to journalArticle

Abstract

Carbon nanotubes (CNTs) are promising products in industry and medicine, but there are several human health concerns since their fibrous structure resembles asbestos. The presence of transition metals, mainly iron, in the fibres seems also implicated in the pathogenetic mechanisms. To unravel the role of iron at mesothelial level, we compared the chemical changes induced in MeT-5A cells by the exposure to asbestos (crocidolite) or CNTs at different content of iron impurities (raw-SWCNTs, purified- and highly purified-SWCNTs). We applied synchrotron-based X-Ray Fluorescence (XRF) microscopy and soft X-ray imaging (absorption and phase contrast images) to monitor chemical and morphological changes of the exposed cells. In parallel, we performed a ferritin assay. X-ray microscopy imaging and XRF well localize the crocidolite fibres interacting with cells, as well as the damage-related morphological changes. Differently, CNTs presence could be only partially evinced by low energy XRF through carbon distribution and sometimes iron co-localisation. Compared to controls, the cells treated with raw-SWCNTs and crocidolite fibres showed a severe alteration of iron distribution and content, with concomitant stimulation of ferritin production. Interestingly, highly purified nanotubes did not altered iron metabolism. The data provide new insights for possible CNTs effects at mesothelial/pleural level in humans.

Original languageEnglish
Pages (from-to)706
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - Jan 15 2018

    Fingerprint

Cite this

Cammisuli, F., Giordani, S., Gianoncelli, A., Rizzardi, C., Radillo, L., Zweyer, M., Da Ros, T., Salomé, M., Melato, M., & Pascolo, L. (2018). Iron-related toxicity of single-walled carbon nanotubes and crocidolite fibres in human mesothelial cells investigated by Synchrotron XRF microscopy. Scientific Reports, 8(1), 706. https://doi.org/10.1038/s41598-017-19076-1