@article {10806, title = {Iron-related toxicity of single-walled carbon nanotubes and crocidolite fibres in human mesothelial cells investigated by Synchrotron XRF microscopy.}, journal = {Sci Rep}, volume = {8}, year = {2018}, month = {2018 01 15}, pages = {706}, 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.

}, keywords = {Asbestos, Crocidolite, Cell Line, Epithelial Cells, Humans, Iron, Microscopy, Fluorescence, Nanotubes, Carbon}, issn = {2045-2322}, doi = {10.1038/s41598-017-19076-1}, author = {Cammisuli, Francesca and Giordani, Silvia and Gianoncelli, Alessandra and Rizzardi, Clara and Radillo, Lucia and Zweyer, Marina and Da Ros, Tatiana and Salom{\`e}, Murielle and Melato, Mauro and Pascolo, Lorella} } @article {10457, title = {Avoiding Ethanol Presence in DNA Samples Enhances the Performance of Ultraviolet Resonance Raman Spectroscopy Analysis.}, journal = {Appl Spectrosc}, volume = {71}, year = {2017}, month = {2017 Jan}, pages = {152-155}, abstract = {

Ethanol is an essential chemical reagent in DNA preparation as its use increases the yield of extraction. All methodologies for DNA isolation involve the use of ethanol in order to prevent DNA dissolution in water and to optimize the binding of DNA to chromatographic membranes. In this note, we show how the presence of ethanol traces in DNA aqueous solution affects ultraviolet Raman spectra, leading to possible misinterpretations. We report a simple method to remove the ethanol Raman features from the spectra, based on heating the DNA sample at 80 {\textcelsius}, followed by a slow cooling procedure.

}, keywords = {DNA, Ethanol, Female, Humans, Placenta, Pregnancy, Spectrophotometry, Ultraviolet, Spectrum Analysis, Raman}, issn = {1943-3530}, doi = {10.1177/0003702816654152}, author = {Cammisuli, Francesca and Pascolo, Lorella and Morgutti, Marcello and Gessini, Alessandro and Masciovecchio, Claudio and D{\textquoteright}Amico, Francesco} } @article {10552, title = {Combined use of AFM and soft X-ray microscopy to reveal fibres{\textquoteright} internalization in mesothelial cells.}, journal = {Analyst}, volume = {142}, year = {2017}, month = {2017 May 30}, pages = {1982-1992}, abstract = {

Nanotoxicology and nanomedicine investigations often require the probing of nano-objects such as fibres and particles in biological samples and cells, whilst internalization and intracellular destiny are the main issues for in vitro cellular studies. Various high resolution microscopy techniques are well suited for providing this highly sought-after information. However, sample preparation, nanomaterial composition and sectioning challenges make it often difficult to establish whether the fibres or particles have been internalized or they are simply overlaying or underlying the biological matter. In this paper we suggest a novel suitable combination of two different microscopic techniques to reveal in intact cells the uptake of asbestos fibres by mesothelial cells. After exposure to asbestos fibres and fixation, cells were first analysed under the AFM instrument and then imaged under the TwinMic soft X-ray microscope at Elettra Sincrotrone. The suggested approach combines standard soft X-ray microscopy imaging and AFM microscopy, with a common non-invasive sample preparation protocol which drastically reduces the experimental uncertainty and provides a quick and definitive answer to the nanoparticle cellular and tissue uptake.

}, keywords = {Asbestos, Cell Line, Epithelial Cells, Epithelium, Humans, Microscopy, Atomic Force, X-Rays}, issn = {1364-5528}, doi = {10.1039/c6an02661c}, author = {Gianoncelli, Alessandra and Kourousias, George and Cammisuli, Francesca and Cassese, Damiano and Rizzardi, Clara and Radillo, Oriano and Lazzarino, Marco and Pascolo, Lorella} } @article {10520, title = {Puzzling Results from Germline Mutations Analysis in a Group of Asbestos-Exposed Patients in a High-risk Area of Northeast Italy.}, journal = {Anticancer Res}, volume = {37}, year = {2017}, month = {2017 06}, pages = {3073-3083}, abstract = {

BACKGROUND: Germline mutations of the oncosuppressor gene breast cancer 1-associated protein 1 (BAP1) were recently related to an autosomal-dominant tumor predisposition syndrome (BAP1-TPDS), characterized by uveal melanoma, malignant mesothelioma (MM), cutaneous melanoma, and other malignancies. The demonstration that BAP1 mutations are strongly associated with MM has provided a real breakthrough in the study of genetic predisposition in MM, that may explain why only a fraction of asbestos-exposed individuals go on to develop MM.

MATERIALS AND METHODS: To evaluate the possible role of BAP1 mutations in the epidemiology of sporadic MM, and their relationship with asbestos exposure, we determined the prevalence of germline BAP1 mutations by the Sanger method in a group of 29 asbestos-exposed patients, 21 of which were diagnosed with MM. They were residents of Trieste, a ship-building town in Northeast Italy with a very high incidence of mesothelioma.

RESULTS: We identified non-obviously pathogenetic germline sequence variants of BAP1 in 3/29 patients and in 2/21 MM cases (10\%).

CONCLUSION: Non obviously pathogenic germline sequence variants of BAP1 were found. Nevertheless, limitations of predictive web tools allowed us to comment on some interesting peculiarities of our findings.

}, keywords = {Aged, Aged, 80 and over, Asbestos, Environmental Exposure, Female, Germ-Line Mutation, Humans, Italy, Lung Neoplasms, Male, Mesothelioma, Middle Aged, Risk, Tumor Suppressor Proteins, Ubiquitin Thiolesterase}, issn = {1791-7530}, doi = {10.21873/anticanres.11663}, author = {Rizzardi, Clara and Athanasakis, Emmanouil and Cammisuli, Francesca and Monego, Simeone Dal and DE Spelorzi, Yeraldin Chiquinquira Castillo and Costantinides, Fulvio and Giudici, Fabiola and Pinamonti, Maurizio and Canzonieri, Vincenzo and Melato, Mauro and Pascolo, Lorella} } @article {8317, title = {Pitfalls and promises in FTIR spectromicroscopy analyses to monitor iron-mediated DNA damage in sperm.}, journal = {Reprod Toxicol}, volume = {61}, year = {2016}, month = {2016 Jun}, pages = {39-46}, abstract = {

Many drugs, chemicals, and environmental factors can impair sperm functionality by inducing DNA damage, one of the important causes of reduced fertility potential. The use of vibrational spectromicroscopy represents a promising approach for monitoring DNA integrity in sperm, although some limitations exist, depending from the experimental conditions. Here, we report that when using FTIR spectromicroscopy to reveal oxidative stress mediated by Fenton{\textquoteright}s reaction on hydrated sperm samples, DNA damage interpretation is partially compromised by unexpected cell surface precipitates. The precipitates give a broad band in the 1150-1000cm(-1) infrared region, which partially covers one of the signatures of DNA (phosphate stretching bands), and are detected as iron and oxygen containing material when using XRF spectroscopy. On the other hand, the analyses further support the potential of FTIR spectromicroscopy to reveal cellular oxidative damage events such as lipid peroxidation, protein misfolding and aggregations, as well as DNA strain breaks.

}, issn = {1873-1708}, doi = {10.1016/j.reprotox.2016.02.011}, author = {Pascolo, Lorella and Bedolla, Diana E and Vaccari, Lisa and Venturin, Irene and Cammisuli, Francesca and Gianoncelli, Alessandra and Mitri, Elisa and Giolo, Elena and Luppi, Stefania and Martinelli, Monica and Zweyer, Marina and Ricci, Giuseppe} } @article {8085, title = {Synchrotron X-ray microscopy reveals early calcium and iron interaction with crocidolite fibers in the lung of exposed mice.}, journal = {Toxicol Lett}, volume = {241}, year = {2016}, month = {2016 Jan 22}, pages = {111-20}, abstract = {

Human exposure to asbestos can cause a wide variety of lung diseases that are still a current major health concern, even if asbestos has been banned in many countries. It has been shown in many studies that asbestos fibers, ingested by alveolar macrophages, disrupt lung iron homeostasis by sequestering iron. Calcium can also be deposited on the fibers. The pathways along which iron and above all calcium interact with fibers are still unknown. Our aim was that of investigating if the iron accumulation induced by the inhaled asbestos fibers also involves calcium ions accumulation. Lung sections of asbestos-exposed mice were analyzed using an extremely sensitive procedure available at the synchrotron facilities, that provides morphological and chemical information based on X-ray fluorescence microspectroscopy (μ-XRF). In this study we show that (1) where conventional histochemical procedures revealed only weak deposits of iron and calcium, μ-XRF analysis is able to detect significant deposits of both iron and calcium on the inhaled asbestos fibers; (2) the extent of the deposition of these ions is proportionally directly related and (3) iron and calcium deposition on inhaled asbestos fibers is concomitant with the appearance of inflammatory and hyperplastic reactions.

}, issn = {1879-3169}, doi = {10.1016/j.toxlet.2015.11.016}, author = {Pascolo, Lorella and Zabucchi, Giuliano and Gianoncelli, Alessandra and Kourousias, George and Trevisan, Elisa and Pascotto, Ernesto and Casarsa, Claudia and Ryan, Chris and Lucattelli, Monica and Lungarella, Giuseppe and Cavarra, Eleonora and Bartalesi, Barbara and Zweyer, Marina and Cammisuli, Francesca and Melato, Mauro and Borelli, Violetta} }