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Ryabtseva MS, Umanskaya SF, Shevchenko MA, Krivobok VS, Kolobov AV, Nastulyavichus AA, Chentsov SI, Sibirtsev VD. Transformation of Nano-Size Titanium Dioxide Particles in the Gastrointestinal Tract and Its Role in the Transfer of Nanoparticles through the Intestinal Barrier. Int J Mol Sci 2023; 24:14911. [PMID: 37834359 PMCID: PMC10573324 DOI: 10.3390/ijms241914911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 09/27/2023] [Accepted: 10/02/2023] [Indexed: 10/15/2023] Open
Abstract
In this work, the size transformation of the TiO2 nanofraction from pharmaceutical grade E171 powder was studied during its transit through the gastrointestinal tract (GIT). It was shown that pharmaceutical-grade TiO2 powder contained about 0.68% (w/w) of particles smaller than 240 nm in diameter. In the observed GIT transit process the TiO2 nanoparticles were agglomerated up to 150-200 nm in simulated salivary fluid, with gradual agglomerate enlargement up to 300-600 nm and more than 1 micron in simulated gastric fluid. In the intestinal fluid the reverse process occurred, involving a decrease of agglomerates accompanied by the formation of a small fraction with ~50 nm average size. This fraction can be further involved in the histohematic transport process. The acidity degree (pH) and mineral composition of solutions, as well as the transit speed along the gastrointestinal tract, influence the nature of the particle transformation significantly. The rapid passing between the gastrointestinal tract sections creates conditions for a decrease in part of the TiO2 particles, up to 100 nm, and may be associated with the violation of the structural and functional integrity of the intestinal mucus layer.
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Affiliation(s)
- M. S. Ryabtseva
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect 53, Moscow 119991, Russia; (S.F.U.); (M.A.S.); (V.S.K.); (A.V.K.); (A.A.N.); (S.I.C.)
| | - S. F. Umanskaya
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect 53, Moscow 119991, Russia; (S.F.U.); (M.A.S.); (V.S.K.); (A.V.K.); (A.A.N.); (S.I.C.)
| | - M. A. Shevchenko
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect 53, Moscow 119991, Russia; (S.F.U.); (M.A.S.); (V.S.K.); (A.V.K.); (A.A.N.); (S.I.C.)
| | - V. S. Krivobok
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect 53, Moscow 119991, Russia; (S.F.U.); (M.A.S.); (V.S.K.); (A.V.K.); (A.A.N.); (S.I.C.)
| | - A. V. Kolobov
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect 53, Moscow 119991, Russia; (S.F.U.); (M.A.S.); (V.S.K.); (A.V.K.); (A.A.N.); (S.I.C.)
| | - A. A. Nastulyavichus
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect 53, Moscow 119991, Russia; (S.F.U.); (M.A.S.); (V.S.K.); (A.V.K.); (A.A.N.); (S.I.C.)
| | - S. I. Chentsov
- P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect 53, Moscow 119991, Russia; (S.F.U.); (M.A.S.); (V.S.K.); (A.V.K.); (A.A.N.); (S.I.C.)
| | - V. D. Sibirtsev
- Department of Veterinary Medicine, Institute of Veterinary, Veterinary-Sanitary Examination and Agricultural Safety, Russian Biotechnological University, Volokolamskoe Highway 11, Moscow 125080, Russia;
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2
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Li Z, Huang Y, Zhong Y, Liang B, Yang X, Wang Q, Sui H, Huang Z. Impact of food matrices on the characteristics and cellular toxicities of ingested nanoplastics in a simulated digestive tract. Food Chem Toxicol 2023; 179:113984. [PMID: 37567356 DOI: 10.1016/j.fct.2023.113984] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 07/27/2023] [Accepted: 08/07/2023] [Indexed: 08/13/2023]
Abstract
Microplastic and nanoplastic (MNP) pollution has become a major global food safety concern. MNPs can interact with food matrices, and their passage through the gastrointestinal tract can modify their properties. To explore whether and how food matrices influence MNP toxicity, we investigated the interactions between polystyrene nanoplastics (PS-NPs) and food matrices, using an in vitro gastrointestinal digestion model. Then, we tested cell viability, particle uptake and cellular toxicities induced by PS-NPs with food matrices in Caco-2 cells. The results showed that PS-NPs were aggregated, both with and without food matrices, after in vitro gastrointestinal digestion. Glyceryl trioleate exerted greater ability to stabilize digestas and to disperse PS-NPs than starch and bovine serum albumin. The protein corona's protein composition on PS-NPs varied when it interacted with different food matrices. Moreover, when combined with food matrices, the PS-NPs' uptake was enhanced, thus aggravating cellular inflammation, stress, and apoptosis levels. Finally, through co-exposure to a mixture of food matrices, we found a combined negative effect of PS-NPs and cadmium on cellular inflammation, stress, and apoptosis levels. This is the first study to compare the impact of various food matrices on the characteristics and cellular toxicities of ingested NPs in a simulated digestive tract.
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Affiliation(s)
- Zhiming Li
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Yuji Huang
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Yizhou Zhong
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Boxuan Liang
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Xingfen Yang
- Food Safety and Health Research Center, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Qing Wang
- Department of Toxicology, School of Public Health, Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Sun Yat-sen University, Guangzhou, 510080, China
| | - Haixia Sui
- NHC Key Laboratory of Food Safety Risk Assessment, China National Center for Food Safety Risk Assessment, Beijing, 100022, China.
| | - Zhenlie Huang
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou, 510515, China.
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3
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Mancuso C, Tremblay E, Gnodi E, Jean S, Beaulieu JF, Barisani D. The Combination of Gold and Silver Food Nanoparticles with Gluten Peptides Alters the Autophagic Pathway in Intestinal Crypt-like Cells. Int J Mol Sci 2023; 24:13040. [PMID: 37685847 PMCID: PMC10487529 DOI: 10.3390/ijms241713040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 08/11/2023] [Accepted: 08/18/2023] [Indexed: 09/10/2023] Open
Abstract
Metallic nanoparticles (mNPs) are widely used as food additives and can interact with gliadin triggering an immune response, but evaluation of the effects on crypts, hypertrophic in celiac subjects, is still lacking. This study evaluated the effects of gold and silver mNPs in combination with gliadin on crypt-like cells (HIEC-6). Transmission electron microscopy (TEM) was used to evaluate gliadin-mNP aggregates in cells. Western blot and immunofluorescence analysis assessed autophagy-related molecule levels (p62, LC3, beclin-1, EGFR). Lysosome functionality was tested with acridine orange (AO) and Magic Red assays. TEM identified an increase in autophagic vacuoles after exposure to gliadin + mNPs, as also detected by significant increments in LC3-II and p62 expression. Immunofluorescence confirmed the presence of mature autophagosomes, showing LC3 and p62 colocalization, indicating an altered autophagic flux, further assessed with EGFR degradation, AO and Magic Red assays. The results showed a significant reduction in lysosomal enzyme activity and a modest reduction in acidity. Thus, gliadin + mNPs can block the autophagic flux inducing a lysosomal defect. The alteration of this pathway, essential for cell function, can lead to cell damage and death. The potential effects of this copresence in food should be further characterized to avoid a negative impact on celiac disease subjects.
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Affiliation(s)
- Clara Mancuso
- School of Medicine and Surgery, University of Milano-Bicocca, 20900 Monza, Italy; (C.M.); (E.G.)
- Laboratory of Intestinal Physiopathology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5H4, Canada; (E.T.); (J.-F.B.)
| | - Eric Tremblay
- Laboratory of Intestinal Physiopathology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5H4, Canada; (E.T.); (J.-F.B.)
| | - Elisa Gnodi
- School of Medicine and Surgery, University of Milano-Bicocca, 20900 Monza, Italy; (C.M.); (E.G.)
| | - Steve Jean
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5H4, Canada;
| | - Jean-François Beaulieu
- Laboratory of Intestinal Physiopathology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5H4, Canada; (E.T.); (J.-F.B.)
| | - Donatella Barisani
- School of Medicine and Surgery, University of Milano-Bicocca, 20900 Monza, Italy; (C.M.); (E.G.)
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4
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Subhasri D, Leena MM, Moses JA, Anandharamakrishnan C. Factors affecting the fate of nanoencapsulates post administration. Crit Rev Food Sci Nutr 2023:1-25. [PMID: 37599624 DOI: 10.1080/10408398.2023.2245462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
Nanoencapsulation has found numerous applications in the food and nutraceutical industries. Micro and nanoencapsulated forms of bioactives have proven benefits in terms of stability, release, and performance in the body. However, the encapsulated ingredient is often subjected to a wide range of processing conditions and this is followed by storage, consumption, and transit along the gastrointestinal tract. A strong understanding of the fate of nanoencapsulates in the biological system is mandatory as it provides valuable insights for ingredient selection, formulation, and application. In addition to their efficacy, there is also the need to assess the safety of ingested nanoencapsulates. Given the rising research and commercial focus of this subject, this review provides a strong focus on their interaction factors and mechanisms, highlighting their prospective biological fate. This review also covers various approaches to studying the fate of nanoencapsulates in the body. Also, with emphasis on the overall scope, the need for a new advanced integrated common methodology to evaluate the fate of nanoencapsulates post-administration is discussed.
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Affiliation(s)
- D Subhasri
- Computational Modeling and Nanoscale Processing Unit, National Institute of Food Technology Entrepreneurship and Management - Thanjavur, Ministry of Food Processing Industries, Government of India, Thanjavur, India
| | - M Maria Leena
- Computational Modeling and Nanoscale Processing Unit, National Institute of Food Technology Entrepreneurship and Management - Thanjavur, Ministry of Food Processing Industries, Government of India, Thanjavur, India
- Department of Biotechnology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tiruchirappalli, India
| | - J A Moses
- Computational Modeling and Nanoscale Processing Unit, National Institute of Food Technology Entrepreneurship and Management - Thanjavur, Ministry of Food Processing Industries, Government of India, Thanjavur, India
| | - C Anandharamakrishnan
- Computational Modeling and Nanoscale Processing Unit, National Institute of Food Technology Entrepreneurship and Management - Thanjavur, Ministry of Food Processing Industries, Government of India, Thanjavur, India
- CSIR - National Institute for Interdisciplinary Science and Technology (NIIST), Ministry of Science and Technology, Government of India, Industrial Estate PO, Thiruvananthapuram, INDIA
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5
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Ferraris F, Raggi A, Ponti J, Mehn D, Gilliland D, Savini S, Iacoponi F, Aureli F, Calzolai L, Cubadda F. Agglomeration Behavior and Fate of Food-Grade Titanium Dioxide in Human Gastrointestinal Digestion and in the Lysosomal Environment. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1908. [PMID: 37446425 DOI: 10.3390/nano13131908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 06/13/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023]
Abstract
In the present study, we addressed the knowledge gaps regarding the agglomeration behavior and fate of food-grade titanium dioxide (E 171) in human gastrointestinal digestion (GID). After thorough multi-technique physicochemical characterization including TEM, single-particle ICP-MS (spICP-MS), CLS, VSSA determination and ELS, the GI fate of E 171 was studied by applying the in vitro GID approach established for the regulatory risk assessment of nanomaterials in Europe, using a standardized international protocol. GI fate was investigated in fasted conditions, relevant to E 171 use in food supplements and medicines, and in fed conditions, with both a model food and E 171-containing food samples. TiO2 constituent particles were resistant to GI dissolution, and thus, their stability in lysosomal fluid was investigated. The biopersistence of the material in lysosomal fluid highlighted its potential for bioaccumulation. For characterizing the agglomeration degree in the small intestinal phase, spICP-MS represented an ideal analytical tool to overcome the limitations of earlier studies. We demonstrated that, after simulated GID, in the small intestine, E 171 (at concentrations reflecting human exposure) is present with a dispersion degree similar to that obtained when dispersing the material in water by means of high-energy sonication (i.e., ≥70% of particles <250 nm).
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Affiliation(s)
- Francesca Ferraris
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Andrea Raggi
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Jessica Ponti
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Dora Mehn
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Douglas Gilliland
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Sara Savini
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Francesca Iacoponi
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Federica Aureli
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
| | - Luigi Calzolai
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Francesco Cubadda
- Istituto Superiore di Sanità-National Institute of Health, 00161 Rome, Italy
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6
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Bietto F, Scardaci R, Brovia M, Kokalari I, Barbero F, Fenoglio I, Pessione E. Food-grade titanium dioxide can affect microbiota physiology, adhesion capability, and interbacterial interactions: A study onL. rhamnosus and E. faecium. Food Chem Toxicol 2023; 176:113760. [PMID: 37028743 DOI: 10.1016/j.fct.2023.113760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 03/25/2023] [Accepted: 03/30/2023] [Indexed: 04/08/2023]
Abstract
Food-grade titanium dioxide (TiO2-FG) is a widespread metal oxide used in the food industries. Recently, the European Food Safety Authority concluded that TiO2-FG cannot be considered safe for consumption due to its genotoxicity; however, its effect on the gut microbiota has not yet been completely unraveled. We studied the effects of TiO2-FG (0.125 mg/mL) on Lactobacillus rhamnosus GG (LGG) and Enterococcus faecium NCIMB10415 (Ent), in particular some physiological and phenotypic traits (growth kinetics, bile salts, and ampicillin resistance) and their interactions with the host (auto-aggregation, biofilm formation, and adhesion on Caco-2/TC7 monolayers) and other gut microorganisms (antimicrobial activity towards pathogens). The results obtained revealed that TiO2-FG alters both LGG and Ent growth and lowers bile resistance (62 and 34.5%, respectively) and adhesion on Caco-2/TC7 monolayers (34.8 and 14.16%, respectively). The other outcomes were strictly species-specific: Ent showed a lower ampicillin sensitivity (14.48%) and auto-aggregation (38.1%), while LGG showed a reduced biofilm formation (37%) and antimicrobial activity towards Staphylococcus aureus (35.73%). Overall, these results suggest an adverse effect of TiO2-FG on both the endogenous and exogenously administered probiotics, contributing to the argument against using TiO2-FG as a food additive.
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Affiliation(s)
- F Bietto
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
| | - R Scardaci
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
| | - M Brovia
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
| | - I Kokalari
- Department of Chemistry, University of Turin, via P. Giuria 7, 10125, Torino, Italy.
| | - F Barbero
- Department of Chemistry, University of Turin, via P. Giuria 7, 10125, Torino, Italy.
| | - I Fenoglio
- Department of Chemistry, University of Turin, via P. Giuria 7, 10125, Torino, Italy.
| | - E Pessione
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
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7
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Furxhi I, Bengalli R, Motta G, Mantecca P, Kose O, Carriere M, Haq EU, O’Mahony C, Blosi M, Gardini D, Costa A. Data-Driven Quantitative Intrinsic Hazard Criteria for Nanoproduct Development in a Safe-by-Design Paradigm: A Case Study of Silver Nanoforms. ACS APPLIED NANO MATERIALS 2023; 6:3948-3962. [PMID: 36938492 PMCID: PMC10012170 DOI: 10.1021/acsanm.3c00173] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 01/20/2023] [Indexed: 06/18/2023]
Abstract
The current European (EU) policies, that is, the Green Deal, envisage safe and sustainable practices for chemicals, which include nanoforms (NFs), at the earliest stages of innovation. A theoretically safe and sustainable by design (SSbD) framework has been established from EU collaborative efforts toward the definition of quantitative criteria in each SSbD dimension, namely, the human and environmental safety dimension and the environmental, social, and economic sustainability dimensions. In this study, we target the safety dimension, and we demonstrate the journey toward quantitative intrinsic hazard criteria derived from findable, accessible, interoperable, and reusable data. Data were curated and merged for the development of new approach methodologies, that is, quantitative structure-activity relationship models based on regression and classification machine learning algorithms, with the intent to predict a hazard class. The models utilize system (i.e., hydrodynamic size and polydispersity index) and non-system (i.e., elemental composition and core size)-dependent nanoscale features in combination with biological in vitro attributes and experimental conditions for various silver NFs, functional antimicrobial textiles, and cosmetics applications. In a second step, interpretable rules (criteria) followed by a certainty factor were obtained by exploiting a Bayesian network structure crafted by expert reasoning. The probabilistic model shows a predictive capability of ≈78% (average accuracy across all hazard classes). In this work, we show how we shifted from the conceptualization of the SSbD framework toward the realistic implementation with pragmatic instances. This study reveals (i) quantitative intrinsic hazard criteria to be considered in the safety aspects during synthesis stage, (ii) the challenges within, and (iii) the future directions for the generation and distillation of such criteria that can feed SSbD paradigms. Specifically, the criteria can guide material engineers to synthesize NFs that are inherently safer from alternative nanoformulations, at the earliest stages of innovation, while the models enable a fast and cost-efficient in silico toxicological screening of previously synthesized and hypothetical scenarios of yet-to-be synthesized NFs.
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Affiliation(s)
- Irini Furxhi
- Transgero
Ltd, Limerick V42V384, Ireland
- Department
of Accounting and Finance, Kemmy Business School, University of Limerick, Limerick V94T9PX, Ireland
| | - Rossella Bengalli
- Department
of Earth and Environmental Sciences, University
of Milano-Bicocca, Piazza
della Scienza 1, Milano 20126, Italy
| | - Giulia Motta
- Department
of Earth and Environmental Sciences, University
of Milano-Bicocca, Piazza
della Scienza 1, Milano 20126, Italy
| | - Paride Mantecca
- Department
of Earth and Environmental Sciences, University
of Milano-Bicocca, Piazza
della Scienza 1, Milano 20126, Italy
| | - Ozge Kose
- Univ.
Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG, SYMMES, Grenoble 38000, France
| | - Marie Carriere
- Univ.
Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG, SYMMES, Grenoble 38000, France
| | - Ehtsham Ul Haq
- Department
of Physics, and Bernal Institute, University
of Limerick, Limerick V94TC9PX, Ireland
| | - Charlie O’Mahony
- Department
of Physics, and Bernal Institute, University
of Limerick, Limerick V94TC9PX, Ireland
| | - Magda Blosi
- Istituto
di Scienza e Tecnologia dei Materiali Ceramici (CNR-ISTEC), Via Granarolo, 64, Faenza 48018, Ravenna, Italy
| | - Davide Gardini
- Istituto
di Scienza e Tecnologia dei Materiali Ceramici (CNR-ISTEC), Via Granarolo, 64, Faenza 48018, Ravenna, Italy
| | - Anna Costa
- Istituto
di Scienza e Tecnologia dei Materiali Ceramici (CNR-ISTEC), Via Granarolo, 64, Faenza 48018, Ravenna, Italy
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8
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Kose O, Béal D, Motellier S, Pelissier N, Collin-Faure V, Blosi M, Bengalli R, Costa A, Furxhi I, Mantecca P, Carriere M. Physicochemical Transformations of Silver Nanoparticles in the Oro-Gastrointestinal Tract Mildly Affect Their Toxicity to Intestinal Cells In Vitro: An AOP-Oriented Testing Approach. TOXICS 2023; 11:199. [PMID: 36976964 PMCID: PMC10056345 DOI: 10.3390/toxics11030199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/10/2023] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
The widespread use of silver nanoparticles (Ag NPs) in food and consumer products suggests the relevance of human oral exposure to these nanomaterials (NMs) and raises the possibility of adverse effects in the gastrointestinal tract. The aim of this study was to investigate the toxicity of Ag NPs in a human intestinal cell line, either uncoated or coated with polyvinylpyrrolidone (Ag PVP) or hydroxyethylcellulose (Ag HEC) and digested in simulated gastrointestinal fluids. Physicochemical transformations of Ag NPs during the different stages of in vitro digestion were identified prior to toxicity assessment. The strategy for evaluating toxicity was constructed on the basis of adverse outcome pathways (AOPs) showing Ag NPs as stressors. It consisted of assessing Ag NP cytotoxicity, oxidative stress, genotoxicity, perturbation of the cell cycle and apoptosis. Ag NPs caused a concentration-dependent loss of cell viability and increased the intracellular level of reactive oxygen species as well as DNA damage and perturbation of the cell cycle. In vitro digestion of Ag NPs did not significantly modulate their toxicological impact, except for their genotoxicity. Taken together, these results indicate the potential toxicity of ingested Ag NPs, which varied depending on their coating but did not differ from that of non-digested NPs.
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Affiliation(s)
- Ozge Kose
- Univ. Grenoble-Alpes, CEA, CNRS, IRIG, SyMMES, CIBEST, 38000 Grenoble, France
| | - David Béal
- Univ. Grenoble-Alpes, CEA, CNRS, IRIG, SyMMES, CIBEST, 38000 Grenoble, France
| | - Sylvie Motellier
- Univ. Grenoble-Alpes, Lab Measure Securing & Environm, LITEN, DTNM, STDC, CEA, 17 Av Martyrs, 38000 Grenoble, France
| | - Nathalie Pelissier
- Univ. Grenoble-Alpes, Lab of Advanced Characterization for Energy, LITEN, DTNM, STDC, CEA, 17 Av Martyrs, 38000 Grenoble, France
| | - Véronique Collin-Faure
- Univ. Grenoble-Alpes, CEA, CNRS UMR5249, IRIG DIESE CBM, Chem & Biol Met, 38054 Grenoble, France
| | - Magda Blosi
- CNR-ISTEC, Institute of Science and Technology for Ceramics-National Research Council of Italy, Via Granarolo 64, 48018 Faenza, Italy
| | - Rossella Bengalli
- Polaris Research Centre, Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza, 1, 20126 Milan, Italy
| | - Anna Costa
- CNR-ISTEC, Institute of Science and Technology for Ceramics-National Research Council of Italy, Via Granarolo 64, 48018 Faenza, Italy
| | - Irini Furxhi
- Transgero Ltd., Newcastle West, V42 V384 Limerick, Ireland
| | - Paride Mantecca
- Polaris Research Centre, Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza, 1, 20126 Milan, Italy
| | - Marie Carriere
- Univ. Grenoble-Alpes, CEA, CNRS, IRIG, SyMMES, CIBEST, 38000 Grenoble, France
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9
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A weight of evidence review of the genotoxicity of titanium dioxide (TiO2). Regul Toxicol Pharmacol 2022; 136:105263. [DOI: 10.1016/j.yrtph.2022.105263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 08/26/2022] [Accepted: 09/10/2022] [Indexed: 11/06/2022]
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10
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Antonello G, Marucco A, Gazzano E, Kainourgios P, Ravagli C, Gonzalez-Paredes A, Sprio S, Padín-González E, Soliman MG, Beal D, Barbero F, Gasco P, Baldi G, Carriere M, Monopoli MP, Charitidis CA, Bergamaschi E, Fenoglio I, Riganti C. Changes of physico-chemical properties of nano-biomaterials by digestion fluids affect the physiological properties of epithelial intestinal cells and barrier models. Part Fibre Toxicol 2022; 19:49. [PMID: 35854319 PMCID: PMC9297619 DOI: 10.1186/s12989-022-00491-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 06/29/2022] [Indexed: 12/15/2022] Open
Abstract
Background The widespread use of nano-biomaterials (NBMs) has increased the chance of human exposure. Although ingestion is one of the major routes of exposure to NBMs, it is not thoroughly studied to date. NBMs are expected to be dramatically modified following the transit into the oral-gastric-intestinal (OGI) tract. How these transformations affect their interaction with intestinal cells is still poorly understood. NBMs of different chemical nature—lipid-surfactant nanoparticles (LSNPs), carbon nanoparticles (CNPs), surface modified Fe3O4 nanoparticles (FNPs) and hydroxyapatite nanoparticles (HNPs)—were treated in a simulated human digestive system (SHDS) and then characterised. The biological effects of SHDS-treated and untreated NBMs were evaluated on primary (HCoEpiC) and immortalised (Caco-2, HCT116) epithelial intestinal cells and on an intestinal barrier model. Results The application of the in vitro SDHS modified the biocompatibility of NBMs on gastrointestinal cells. The differences between SHDS-treated and untreated NBMs could be attributed to the irreversible modification of the NBMs in the SHDS. Aggregation was detected for all NBMs regardless of their chemical nature, while pH- or enzyme-mediated partial degradation was detected for hydroxyapatite or polymer-coated iron oxide nanoparticles and lipid nanoparticles, respectively. The formation of a bio-corona, which contains proteases, was also demonstrated on all the analysed NBMs. In viability assays, undifferentiated primary cells were more sensitive than immortalised cells to digested NBMs, but neither pristine nor treated NBMs affected the intestinal barrier viability and permeability. SHDS-treated NBMs up-regulated the tight junction genes (claudin 3 and 5, occludin, zonula occludens 1) in intestinal barrier, with different patterns between each NBM, and increase the expression of both pro- and anti-inflammatory cytokines (IL-1β, TNF-α, IL-22, IL-10). Notably, none of these NBMs showed any significant genotoxic effect. Conclusions Overall, the results add a piece of evidence on the importance of applying validated in vitro SHDS models for the assessment of NBM intestinal toxicity/biocompatibility. We propose the association of chemical and microscopic characterization, SHDS and in vitro tests on both immortalised and primary cells as a robust screening pipeline useful to monitor the changes in the physico-chemical properties of ingested NBMs and their effects on intestinal cells. Supplementary Information The online version contains supplementary material available at 10.1186/s12989-022-00491-w.
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Affiliation(s)
- Giulia Antonello
- Department of Chemistry, University of Turin, Via Pietro Giuria 7, 10125, Turin, Italy.,Department of Public Health and Pediatrics, University of Turin, Piazza Polonia, 94, 10126, Turin, Italy.,Department of Oncology, University of Turin, Via Santena 5 bis, 10126, Turin, Italy
| | - Arianna Marucco
- Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Turin, Italy
| | - Elena Gazzano
- Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Turin, Italy
| | - Panagiotis Kainourgios
- Research Unit of Advanced, Composite, Nano-Materials and Nanotechnology, School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechniou St., 15780, Zographos, Athens, Greece
| | - Costanza Ravagli
- Colorobbia Consulting Srl, Headwork, Via Pietramarina, 53, 50059, Sovigliana, Vinci, FI, Italy
| | | | - Simone Sprio
- National Research Council, Institute of Science and Technology for Ceramics ISTEC-CNR, Via Granarolo 64, 48018, Faenza, RA, Italy
| | - Esperanza Padín-González
- Department of Chemistry, Royal College of Surgeons in Ireland (RCSI), 123 St Stephen Green, Dublin 2, Ireland
| | - Mahmoud G Soliman
- Department of Chemistry, Royal College of Surgeons in Ireland (RCSI), 123 St Stephen Green, Dublin 2, Ireland
| | - David Beal
- CEA, CNRS, IRIG, SyMMES-CIBEST, Université Grenoble Alpes, 38000, Grenoble, France
| | - Francesco Barbero
- Department of Chemistry, University of Turin, Via Pietro Giuria 7, 10125, Turin, Italy
| | - Paolo Gasco
- Nanovector Srl, Headwork, Via Livorno 60, 10144, Turin, Italy
| | - Giovanni Baldi
- Colorobbia Consulting Srl, Headwork, Via Pietramarina, 53, 50059, Sovigliana, Vinci, FI, Italy
| | - Marie Carriere
- CEA, CNRS, IRIG, SyMMES-CIBEST, Université Grenoble Alpes, 38000, Grenoble, France
| | - Marco P Monopoli
- Department of Chemistry, Royal College of Surgeons in Ireland (RCSI), 123 St Stephen Green, Dublin 2, Ireland
| | - Costas A Charitidis
- Research Unit of Advanced, Composite, Nano-Materials and Nanotechnology, School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechniou St., 15780, Zographos, Athens, Greece
| | - Enrico Bergamaschi
- Department of Public Health and Pediatrics, University of Turin, Piazza Polonia, 94, 10126, Turin, Italy
| | - Ivana Fenoglio
- Department of Chemistry, University of Turin, Via Pietro Giuria 7, 10125, Turin, Italy.
| | - Chiara Riganti
- Department of Oncology, University of Turin, Via Santena 5 bis, 10126, Turin, Italy.
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11
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Baranowska-Wójcik E, Szwajgier D, Winiarska-Mieczan A. A review of research on the impact of E171/TiO 2 NPs on the digestive tract. J Trace Elem Med Biol 2022; 72:126988. [PMID: 35561571 DOI: 10.1016/j.jtemb.2022.126988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Revised: 04/01/2022] [Accepted: 04/25/2022] [Indexed: 12/24/2022]
Abstract
Nanotechnology utilises particles of between 1 and 100 nm in size. In recent years, it has enjoyed widespread application in a variety of areas. However, this has also raised increasing concerns regarding the effects that the use of nanoparticles may have on human health. The nanoparticles of titanium dioxide (TiO2 NPs) are among the most promising nanomaterials and have already found wide use in cosmetics, medicine and, the food industry. A nano-sized (diameter < 100 nm) fraction of TiO2 is present, at a certain percentage, in the E171 ( in the EU) pigment commonly used as an additive in food, whose presence raises particular concerns in terms of its potential negative health impact. The consumption of E171 food additive is increasingly associated with disorders of the intestinal barrier, including intestinal dysbiosis. It may disrupt the normal functions of the gastrointestinal tract (GIT) including: enzymatic digestion of primary nutrients (lipids, proteins, or carbohydrates). The aim of this review is to provide a comprehensive and reliable overview of studies conducted in recent years in terms of the substance's potentially negative impact on human and animal alimentary systems.
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Affiliation(s)
- Ewa Baranowska-Wójcik
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, Skromna 8, Lublin 20-704, Poland.
| | - Dominik Szwajgier
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, Skromna 8, Lublin 20-704, Poland
| | - Anna Winiarska-Mieczan
- Institute of Animal Nutrition and Bromatology, Department of Bromatology and Food Physiology, University of Life Sciences in Lublin, Akademicka 13, Lublin 20-950, Poland
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12
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Interactions between Nanoparticles and Intestine. Int J Mol Sci 2022; 23:ijms23084339. [PMID: 35457155 PMCID: PMC9024817 DOI: 10.3390/ijms23084339] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 04/10/2022] [Accepted: 04/12/2022] [Indexed: 02/01/2023] Open
Abstract
The use of nanoparticles (NPs) has surely grown in recent years due to their versatility, with a spectrum of applications that range from nanomedicine to the food industry. Recent research focuses on the development of NPs for the oral administration route rather than the intravenous one, placing the interactions between NPs and the intestine at the centre of the attention. This allows the NPs functionalization to exploit the different characteristics of the digestive tract, such as the different pH, the intestinal mucus layer, or the intestinal absorption capacity. On the other hand, these same characteristics can represent a problem for their complexity, also considering the potential interactions with the food matrix or the microbiota. This review intends to give a comprehensive look into three main branches of NPs delivery through the oral route: the functionalization of NPs drug carriers for systemic targets, with the case of insulin carriers as an example; NPs for the delivery of drugs locally active in the intestine, for the treatment of inflammatory bowel diseases and colon cancer; finally, the potential concerns and side effects of the accidental and uncontrolled exposure to NPs employed as food additives, with focus on E171 (titanium dioxide) and E174 (silver NPs).
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13
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Ma Y, Koh JYC, Lim HK, Shi P, Tay CY. Elucidating the Size‐dependency of in Vitro Digested Polystyrene Microplastics on Human Intestinal Cells Health And Function. MACROMOL CHEM PHYS 2022. [DOI: 10.1002/macp.202100454] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yiyuan Ma
- School of Materials Science and Engineering Nanyang Technological University N4.1, 50 Nanyang Avenue Singapore 639798 Singapore
- Environmental Chemistry and Materials Centre Nanyang Environment & Water Research Institute 1 CleanTech Loop, CleanTech One Singapore 637141 Singapore
| | - Jie Yan Cheryl Koh
- School of Materials Science and Engineering Nanyang Technological University N4.1, 50 Nanyang Avenue Singapore 639798 Singapore
- Environmental Chemistry and Materials Centre Nanyang Environment & Water Research Institute 1 CleanTech Loop, CleanTech One Singapore 637141 Singapore
| | - Hong Kit Lim
- School of Materials Science and Engineering Nanyang Technological University N4.1, 50 Nanyang Avenue Singapore 639798 Singapore
| | - Pujiang Shi
- Energy Research Institute Nanyang Technological University Singapore 50 Nanyang Drive 637553 Singapore
| | - Chor Yong Tay
- School of Materials Science and Engineering Nanyang Technological University N4.1, 50 Nanyang Avenue Singapore 639798 Singapore
- Environmental Chemistry and Materials Centre Nanyang Environment & Water Research Institute 1 CleanTech Loop, CleanTech One Singapore 637141 Singapore
- Energy Research Institute Nanyang Technological University Singapore 50 Nanyang Drive 637553 Singapore
- School of Biological Sciences Nanyang Technological University 60 Nanyang Drive Singapore 637551 Singapore
- Center for Sustainable Materials (SunSmart) School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore
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14
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Behaviour of Titanium Dioxide Particles in Artificial Body Fluids and Human Blood Plasma. Int J Mol Sci 2021; 22:ijms221910614. [PMID: 34638952 PMCID: PMC8509028 DOI: 10.3390/ijms221910614] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/22/2021] [Accepted: 09/24/2021] [Indexed: 12/13/2022] Open
Abstract
The growing application of materials containing TiO2 particles has led to an increased risk of human exposure, while a gap in knowledge about the possible adverse effects of TiO2 still exists. In this work, TiO2 particles of rutile, anatase, and their commercial mixture were exposed to various environments, including simulated gastric fluids and human blood plasma (both representing in vivo conditions), and media used in in vitro experiments. Simulated body fluids of different compositions, ionic strengths, and pH were used, and the impact of the absence or presence of chosen enzymes was investigated. The physicochemical properties and agglomeration of TiO2 in these media were determined. The time dependent agglomeration of TiO2 related to the type of TiO2, and mainly to the type and composition of the environment that was observed. The presence of enzymes either prevented or promoted TiO2 agglomeration. TiO2 was also observed to exhibit concentration-dependent cytotoxicity. This knowledge about TiO2 behavior in all the abovementioned environments is critical when TiO2 safety is considered, especially with respect to the significant impact of the presence of proteins and size-related cytotoxicity.
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15
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Barreau F, Tisseyre C, Ménard S, Ferrand A, Carriere M. Titanium dioxide particles from the diet: involvement in the genesis of inflammatory bowel diseases and colorectal cancer. Part Fibre Toxicol 2021; 18:26. [PMID: 34330311 PMCID: PMC8323234 DOI: 10.1186/s12989-021-00421-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 07/19/2021] [Indexed: 12/12/2022] Open
Abstract
The gastrointestinal tract is a complex interface between the external environment and the immune system. Its ability to control uptake across the mucosa and to protect the body from damage of harmful substances from the lumen is defined as the intestinal barrier function (IBF). The IBF involves four elements: the intestinal microbiota, the mucus layer, the epithelium and the immune system. Its dysfunction is linked with human diseases including inflammatory, metabolic, infectious, autoimmune and neurologic disorders. Most of these diseases are complex and involve genetic, psychological and environmental factors. Over the past 10 years, many genetic polymorphisms predisposing to inflammatory bowel disease (IBD) have been identified. Yet, it is now clear that they are insufficient to explain the onset of these chronic diseases. Although it has been evidenced that some environmental factors such as cigarette smoking or carbohydrate intake are associated with IBD, other environmental factors also present potential health risks such as ingestion of food additives introduced in the human diet, including those composed of mineral particles, by altering the four elements of the intestinal barrier function. The aim of this review is to provide a critical opinion on the potential of TiO2 particles, especially when used as a food additive, to alter the four elements of the intestinal barrier function, and consequently to evaluate if this additive would likely play a role in the development and/or exacerbation of IBD.
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Affiliation(s)
- Frédérick Barreau
- INSERM, UMR 1220, Institut de Recherche en Santé Digestive, 31024, Toulouse, France. .,Université de Toulouse, Toulouse, France.
| | - Céline Tisseyre
- Univ. Grenoble Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, CIBEST, 17 rue des Martyrs, 38000, Grenoble, France
| | - Sandrine Ménard
- INSERM, UMR 1220, Institut de Recherche en Santé Digestive, 31024, Toulouse, France.,Université de Toulouse, Toulouse, France
| | - Audrey Ferrand
- INSERM, UMR 1220, Institut de Recherche en Santé Digestive, 31024, Toulouse, France.,Université de Toulouse, Toulouse, France
| | - Marie Carriere
- Univ. Grenoble Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, CIBEST, 17 rue des Martyrs, 38000, Grenoble, France.
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La Maestra S, D’Agostini F, Sanguineti E, Yus González A, Annis S, Militello GM, Parisi G, Scuderi A, Gaggero L. Dispersion of Natural Airborne TiO 2 Fibres in Excavation Activity as a Potential Environmental and Human Health Risk. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:6587. [PMID: 34207363 PMCID: PMC8296425 DOI: 10.3390/ijerph18126587] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 06/15/2021] [Accepted: 06/17/2021] [Indexed: 11/16/2022]
Abstract
Titanium is the ninth most abundant element, approximately 0.7% of the Earth crust. It is used worldwide in large quantities for various applications. The IARC includes TiO2 in Group 2B as possibly carcinogenic to humans suggesting that pathological effects correlate to particle size and shape. This study case quantifies the release of natural TiO2 particles during mining activity, involving meta-basalt and shale lithologies in the Ligurian Alps, during excavation of the Terzo Valico as part of the Trans-European Transport Network. Type, width, length, aspect ratio, and concentration of TiO2 particles in needle habit were determined. The different samplings have reported that airborne concentrations in meta-basalt were 4.21 ff/L and 23.94 ff/L in shale. In both cases, the concentration never exceeds the limits established by various organizations for workers health protection. Nevertheless, TiO2 elongated particles, recognized as rutile, showed the dimensional characteristic of fibres, as reported by WHO. These fibres deserve particular attention because they can reach the alveolar space and trigger inflammation and chronic diseases. The results indicate that monitoring the TiO2 in both working environments and Ti-rich geological formations, associated with epidemiological studies, may represent a useful tool to determine the exposure risk of workers and the general population.
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Affiliation(s)
| | | | - Elisa Sanguineti
- Department of Earth, Environment and Life Sciences, University of Genoa, 16132 Genoa, Italy; (E.S.); (A.Y.G.); (S.A.); (G.M.M.); (L.G.)
| | - Adrián Yus González
- Department of Earth, Environment and Life Sciences, University of Genoa, 16132 Genoa, Italy; (E.S.); (A.Y.G.); (S.A.); (G.M.M.); (L.G.)
| | - Samanta Annis
- Department of Earth, Environment and Life Sciences, University of Genoa, 16132 Genoa, Italy; (E.S.); (A.Y.G.); (S.A.); (G.M.M.); (L.G.)
| | - Gaia M. Militello
- Department of Earth, Environment and Life Sciences, University of Genoa, 16132 Genoa, Italy; (E.S.); (A.Y.G.); (S.A.); (G.M.M.); (L.G.)
| | - Giovanni Parisi
- COCIV, Via Renata Bianchi 40, I-16152 Genova, Italy; (G.P.); (A.S.)
| | - Alberto Scuderi
- COCIV, Via Renata Bianchi 40, I-16152 Genova, Italy; (G.P.); (A.S.)
| | - Laura Gaggero
- Department of Earth, Environment and Life Sciences, University of Genoa, 16132 Genoa, Italy; (E.S.); (A.Y.G.); (S.A.); (G.M.M.); (L.G.)
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17
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Dietary Nanoparticles Interact with Gluten Peptides and Alter the Intestinal Homeostasis Increasing the Risk of Celiac Disease. Int J Mol Sci 2021; 22:ijms22116102. [PMID: 34198897 PMCID: PMC8201331 DOI: 10.3390/ijms22116102] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/15/2021] [Accepted: 06/02/2021] [Indexed: 12/22/2022] Open
Abstract
The introduction of metallic nanoparticles (mNPs) into the diet is a matter of concern for human health. In particular, their effect on the gastrointestinal tract may potentially lead to the increased passage of gluten peptides and the activation of the immune response. In consequence, dietary mNPs could play a role in the increasing worldwide celiac disease (CeD) incidence. We evaluated the potential synergistic effects that peptic-tryptic-digested gliadin (PT) and the most-used food mNPs may induce on the intestinal mucosa. PT interaction with mNPs and their consequent aggregation was detected by transmission electron microscopy (TEM) analyses and UV–Vis spectra. In vitro experiments on Caco-2 cells proved the synergistic cytotoxic effect of PT and mNPs, as well as alterations in the monolayer integrity and tight junction proteins. Exposure of duodenal biopsies to gliadin plus mNPs triggered cytokine production, but only in CeD biopsies. These results suggest that mNPs used in the food sector may alter intestinal homeostasis, thus representing an additional environmental risk factor for the development of CeD.
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