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Liang C, Zhang X, Fang J, Sun N, Liu H, Feng Y, Wang H, Yu Z, Jia X. Genotoxicity evaluation of food additive titanium dioxide using a battery of standard in vivo tests. Regul Toxicol Pharmacol 2024; 148:105586. [PMID: 38382587 DOI: 10.1016/j.yrtph.2024.105586] [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: 11/07/2023] [Revised: 02/04/2024] [Accepted: 02/18/2024] [Indexed: 02/23/2024]
Abstract
The increasing use of titanium dioxide (TiO2) nanoparticles (NPs) has raised concern about the safety of food additive TiO2. TiO2 has been considered no longer safe by EFSA due to concerns over genotoxicity, however, there are conflicting opinions upon the safety of TiO2 as a food additive, and the number of in vivo genotoxicity studies conducted on food additive TiO2 was limited. In order to investigate the potential genotoxicity of food additive TiO2, we evaluated the genotoxicity of a commercial food additive TiO2 (average size of 135.54 ± 41.01 nm, range from 60.83 to 230.16 nm, NPs account for 30% by number) using a battery of standard in vivo tests, including mammalian erythrocyte micronucleus test, mammalian bone marrow chromosomal aberration test and in vivo mammalian alkaline comet test. After 15 days of consecutive intragastric administration at doses of 250, 500, and 1000 mg/kgBW, food additive TiO2 neither increased the frequencies of bone marrow micronuclei or chromosomal aberration in mice, nor induced DNA strand breakage in rat liver cells. These results indicate that under the condition of this study, food additive TiO2 does not have genotoxic potential although it contains a fraction of NPs.
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Affiliation(s)
- Chunlai Liang
- NHC Key Laboratory of Food Safety Assessment, Chinese Academy of Medical Science Research Unit (2019RU014), China National Center for Food Safety Risk Assessment, Beijing, 100021, China
| | - Xiaopeng Zhang
- NHC Key Laboratory of Food Safety Assessment, Chinese Academy of Medical Science Research Unit (2019RU014), China National Center for Food Safety Risk Assessment, Beijing, 100021, China
| | - Jin Fang
- NHC Key Laboratory of Food Safety Assessment, Chinese Academy of Medical Science Research Unit (2019RU014), China National Center for Food Safety Risk Assessment, Beijing, 100021, China
| | - Nana Sun
- NHC Key Laboratory of Food Safety Assessment, Chinese Academy of Medical Science Research Unit (2019RU014), China National Center for Food Safety Risk Assessment, Beijing, 100021, China
| | - Haibo Liu
- NHC Key Laboratory of Food Safety Assessment, Chinese Academy of Medical Science Research Unit (2019RU014), China National Center for Food Safety Risk Assessment, Beijing, 100021, China
| | - Yongquan Feng
- NHC Key Laboratory of Food Safety Assessment, Chinese Academy of Medical Science Research Unit (2019RU014), China National Center for Food Safety Risk Assessment, Beijing, 100021, China
| | - Huali Wang
- NHC Key Laboratory of Food Safety Assessment, Chinese Academy of Medical Science Research Unit (2019RU014), China National Center for Food Safety Risk Assessment, Beijing, 100021, China
| | - Zhou Yu
- NHC Key Laboratory of Food Safety Assessment, Chinese Academy of Medical Science Research Unit (2019RU014), China National Center for Food Safety Risk Assessment, Beijing, 100021, China.
| | - Xudong Jia
- NHC Key Laboratory of Food Safety Assessment, Chinese Academy of Medical Science Research Unit (2019RU014), China National Center for Food Safety Risk Assessment, Beijing, 100021, China.
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Crișan S, Pop AL, Lacatusu I, Badea N, Mustaciosu C, Radu M, Varlas VN, Peneş ON, Ciobanu AM, Ghica M, Voicu SN, Udeanu DI. Safety of Innovative Nanotechnology Oral Formulations Loaded with Bioactive Menopause Molecules: Influence of Genotoxicity and Biochemical Parameters on a Menopausal Rat Model. Nutrients 2023; 15:4951. [PMID: 38068809 PMCID: PMC10708031 DOI: 10.3390/nu15234951] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 11/14/2023] [Accepted: 11/23/2023] [Indexed: 12/18/2023] Open
Abstract
In recent years, nanoparticles have gained significant importance due to their unique properties, such as pharmacological, electrical, optical, and magnetic abilities, contributing to the growth of the science and technology sector. Particular naturally derived biomolecules with beneficial effects on menopause disorder have been the subject of studies of pharmaceutical formulation to obtain alternative pharmaceutical forms with increased bioavailability and without side effects, as in nanostructured lipid carriers (NLCs) loaded with such active ingredients. In the present study, one stage of a broader project, we have performed pharmacotoxicology studies for six combinatory innovative nanocapsule pharmaceutical forms containing active natural biomolecules before considering them as oral formulas for (1) in vitro toxicity studies on culture cells and (2) in vivo preclinical studies on a surgically induced menopause model of Wistar female rats, and the influence of the NLCs on key biochemical parameters: lipid profile (TG, Chol, HDL), glycemic markers (Gli), bone markers (Pac, Palc, Ca, phosphorus), renal markers (Crea, urea, URAC), inflammation (TNF), oxidative stress (GSH, MDA), and estrogen-progesterone hormonal profile. The micronucleus test did not reveal the genotoxicity of the tested compounds; the menopause model showed no significant safety concerns for the six tested formulas evaluated using the blood biochemical parameters; and the results showed the potential hypoglycemic, hypolipidemic, hypouricemic, and antioxidant potential of one of the tested formulas containing nano diosgenin and glycyrrhizic acid.
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Affiliation(s)
- Simona Crișan
- Faculty of Pharmacy, “Carol Davila” University of Medicine and Pharmacy, 6 Traian Vuia Street, 020945 Bucharest, Romania; (S.C.); (A.L.P.); (A.M.C.); (M.G.); (D.I.U.)
- R&D Center, AC HELCOR, Victor Babes St., 430082 Baia Mare, Romania
| | - Anca Lucia Pop
- Faculty of Pharmacy, “Carol Davila” University of Medicine and Pharmacy, 6 Traian Vuia Street, 020945 Bucharest, Romania; (S.C.); (A.L.P.); (A.M.C.); (M.G.); (D.I.U.)
| | - Ioana Lacatusu
- Faculty of Applied Chemistry and Materials Science, The Polytechnic University of Bucharest, Polizu No 1, 011061 Bucharest, Romania; (I.L.); (N.B.)
| | - Nicoleta Badea
- Faculty of Applied Chemistry and Materials Science, The Polytechnic University of Bucharest, Polizu No 1, 011061 Bucharest, Romania; (I.L.); (N.B.)
| | - Cosmin Mustaciosu
- Horia Hulubei National Institute for Physics and Nuclear Engineering IFIN-HH, 077125 Bucharest, Romania; (C.M.); (M.R.)
| | - Mihai Radu
- Horia Hulubei National Institute for Physics and Nuclear Engineering IFIN-HH, 077125 Bucharest, Romania; (C.M.); (M.R.)
| | - Valentin Nicolae Varlas
- Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 37 Dionisie Lupu Street, 020021 Bucharest, Romania
| | - Ovidiu Nicolae Peneş
- Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 37 Dionisie Lupu Street, 020021 Bucharest, Romania
| | - Anne Marie Ciobanu
- Faculty of Pharmacy, “Carol Davila” University of Medicine and Pharmacy, 6 Traian Vuia Street, 020945 Bucharest, Romania; (S.C.); (A.L.P.); (A.M.C.); (M.G.); (D.I.U.)
| | - Manuela Ghica
- Faculty of Pharmacy, “Carol Davila” University of Medicine and Pharmacy, 6 Traian Vuia Street, 020945 Bucharest, Romania; (S.C.); (A.L.P.); (A.M.C.); (M.G.); (D.I.U.)
| | - Sorina Nicoleta Voicu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 030018 Bucharest, Romania;
| | - Denisa Ioana Udeanu
- Faculty of Pharmacy, “Carol Davila” University of Medicine and Pharmacy, 6 Traian Vuia Street, 020945 Bucharest, Romania; (S.C.); (A.L.P.); (A.M.C.); (M.G.); (D.I.U.)
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Ventura C, Pinto F, Lourenço AF, Pedrosa JFS, Fernandes SN, da Rosa RR, Godinho MH, Ferreira PJT, Louro H, Silva MJ. Assessing the Genotoxicity of Cellulose Nanomaterials in a Co-Culture of Human Lung Epithelial Cells and Monocyte-Derived Macrophages. Bioengineering (Basel) 2023; 10:986. [PMID: 37627871 PMCID: PMC10452089 DOI: 10.3390/bioengineering10080986] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 08/16/2023] [Accepted: 08/17/2023] [Indexed: 08/27/2023] Open
Abstract
Cellulose micro/nanomaterials (CMNMs) are innovative materials with a wide spectrum of industrial and biomedical applications. Although cellulose has been recognized as a safe material, the unique properties of its nanosized forms have raised concerns about their safety for human health. Genotoxicity is an endpoint that must be assessed to ensure that no carcinogenic risks are associated with exposure to nanomaterials. In this study, we evaluated the genotoxicity of two types of cellulose micro/nanofibrils (CMF and CNF) and one sample of cellulose nanocrystals (CNC), obtained from industrial bleached Eucalyptus globulus kraft pulp. For that, we exposed co-cultures of human alveolar epithelial A549 cells and THP-1 monocyte-derived macrophages to a concentration range of each CMNM and used the micronucleus (MN) and comet assays. Our results showed that only the lowest concentrations of the CMF sample were able to induce DNA strand breaks (FPG-comet assay). However, none of the three CMNMs produced significant chromosomal alterations (MN assay). These findings, together with results from previous in vitro studies using monocultures of A549 cells, indicate that the tested CNF and CNC are not genotoxic under the conditions tested, while the CMF display a low genotoxic potential.
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Affiliation(s)
- Célia Ventura
- Department of Human Genetics, Instituto Nacional de Saúde Doutor Ricardo Jorge, Av Padre Cruz, 1649-016 Lisbon, Portugal; (C.V.); (F.P.); (H.L.)
- ToxOmics—Centre for Toxicogenomics and Human Health, NOVA Medical School, NOVA University Lisbon, 1169-056 Lisbon, Portugal
| | - Fátima Pinto
- Department of Human Genetics, Instituto Nacional de Saúde Doutor Ricardo Jorge, Av Padre Cruz, 1649-016 Lisbon, Portugal; (C.V.); (F.P.); (H.L.)
- ToxOmics—Centre for Toxicogenomics and Human Health, NOVA Medical School, NOVA University Lisbon, 1169-056 Lisbon, Portugal
| | | | - Jorge F. S. Pedrosa
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Pólo II, R. Sílvio Lima, 3030-790 Coimbra, Portugal; (J.F.S.P.); (P.J.T.F.)
| | - Susete N. Fernandes
- i3N/CENIMAT, Department of Materials Science, NOVA School of Science and Technology, NOVA University Lisbon, Campus de Caparica, 2829-516 Lisbon, Portugal; (S.N.F.); (R.R.d.R.); (M.H.G.)
| | - Rafaela R. da Rosa
- i3N/CENIMAT, Department of Materials Science, NOVA School of Science and Technology, NOVA University Lisbon, Campus de Caparica, 2829-516 Lisbon, Portugal; (S.N.F.); (R.R.d.R.); (M.H.G.)
| | - Maria Helena Godinho
- i3N/CENIMAT, Department of Materials Science, NOVA School of Science and Technology, NOVA University Lisbon, Campus de Caparica, 2829-516 Lisbon, Portugal; (S.N.F.); (R.R.d.R.); (M.H.G.)
| | - Paulo J. T. Ferreira
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Pólo II, R. Sílvio Lima, 3030-790 Coimbra, Portugal; (J.F.S.P.); (P.J.T.F.)
| | - Henriqueta Louro
- Department of Human Genetics, Instituto Nacional de Saúde Doutor Ricardo Jorge, Av Padre Cruz, 1649-016 Lisbon, Portugal; (C.V.); (F.P.); (H.L.)
- ToxOmics—Centre for Toxicogenomics and Human Health, NOVA Medical School, NOVA University Lisbon, 1169-056 Lisbon, Portugal
| | - Maria João Silva
- Department of Human Genetics, Instituto Nacional de Saúde Doutor Ricardo Jorge, Av Padre Cruz, 1649-016 Lisbon, Portugal; (C.V.); (F.P.); (H.L.)
- ToxOmics—Centre for Toxicogenomics and Human Health, NOVA Medical School, NOVA University Lisbon, 1169-056 Lisbon, Portugal
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4
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Rodríguez-Garraus A, Passerino C, Vales G, Carlin M, Suhonen S, Tubaro A, Gómez J, Pelin M, Catalán J. Impact of physico-chemical properties on the toxicological potential of reduced graphene oxide in human bronchial epithelial cells. Nanotoxicology 2023; 17:471-495. [PMID: 37799028 DOI: 10.1080/17435390.2023.2265465] [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: 07/14/2023] [Accepted: 09/13/2023] [Indexed: 10/07/2023]
Abstract
The increasing use of graphene-based materials (GBM) requires their safety evaluation, especially in occupational settings. The same physico-chemical (PC) properties that confer GBM extraordinary functionalities may affect the potential toxic response. Most toxicity assessments mainly focus on graphene oxide and rarely investigate GBMs varying only by one property. As a novelty, the present study assessed the in vitro cytotoxicity and genotoxicity of six reduced graphene oxides (rGOs) with different PC properties in the human bronchial epithelial 16HBE14o - cell line. Of the six materials, rGO1-rGO4 only differed in the carbon-to-oxygen (C/O) content, whereas rGO5 and rGO6 were characterized by different lateral size and number of layers, respectively, but similar C/O content compared with rGO1. The materials were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, laser diffraction and dynamic light scattering, and Brunauer-Emmett-Teller analysis. Cytotoxicity (Luminescent Cell Viability and WST-8 assays), the induction of reactive oxygen species (ROS; 2',7'-dichlorofluorescin diacetate-based assay), the production of cytokines (enzyme-linked immunosorbent assays) and genotoxicity (comet and micronucleus assays) were evaluated. Furthermore, the internalization of the materials in the cells was confirmed by laser confocal microscopy. No relationships were found between the C/O ratio or the lateral size and any of the rGO-induced biological effects. However, rGO of higher oxygen content showed higher cytotoxic and early ROS-inducing potential, whereas genotoxic effects were observed with the rGO of the lowest density of oxygen groups. On the other hand, a higher number of layers seems to be associated with a decreased potential for inducing cytotoxicity and ROS production.
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Affiliation(s)
| | - Clara Passerino
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Gerard Vales
- Finnish Institute of Occupational Health, Työterveyslaitos, Helsinki, Finland
| | - Michela Carlin
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Satu Suhonen
- Finnish Institute of Occupational Health, Työterveyslaitos, Helsinki, Finland
| | - Aurelia Tubaro
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Julio Gómez
- Avanzare Innovacion Tecnologica S.L, Navarrete, Spain
| | - Marco Pelin
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Julia Catalán
- Finnish Institute of Occupational Health, Työterveyslaitos, Helsinki, Finland
- Department of Anatomy, Embryology and Genetics, University of Zaragoza, Zaragoza, Spain
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5
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Ruijter N, Soeteman-Hernández LG, Carrière M, Boyles M, McLean P, Catalán J, Katsumiti A, Cabellos J, Delpivo C, Sánchez Jiménez A, Candalija A, Rodríguez-Llopis I, Vázquez-Campos S, Cassee FR, Braakhuis H. The State of the Art and Challenges of In Vitro Methods for Human Hazard Assessment of Nanomaterials in the Context of Safe-by-Design. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:472. [PMID: 36770432 PMCID: PMC9920318 DOI: 10.3390/nano13030472] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/16/2023] [Accepted: 01/18/2023] [Indexed: 06/18/2023]
Abstract
The Safe-by-Design (SbD) concept aims to facilitate the development of safer materials/products, safer production, and safer use and end-of-life by performing timely SbD interventions to reduce hazard, exposure, or both. Early hazard screening is a crucial first step in this process. In this review, for the first time, commonly used in vitro assays are evaluated for their suitability for SbD hazard testing of nanomaterials (NMs). The goal of SbD hazard testing is identifying hazard warnings in the early stages of innovation. For this purpose, assays should be simple, cost-effective, predictive, robust, and compatible. For several toxicological endpoints, there are indications that commonly used in vitro assays are able to predict hazard warnings. In addition to the evaluation of assays, this review provides insights into the effects of the choice of cell type, exposure and dispersion protocol, and the (in)accurate determination of dose delivered to cells on predictivity. Furthermore, compatibility of assays with challenging advanced materials and NMs released from nano-enabled products (NEPs) during the lifecycle is assessed, as these aspects are crucial for SbD hazard testing. To conclude, hazard screening of NMs is complex and joint efforts between innovators, scientists, and regulators are needed to further improve SbD hazard testing.
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Affiliation(s)
- Nienke Ruijter
- National Institute for Public Health & the Environment (RIVM), 3721 MA Bilthoven, The Netherlands
| | | | - Marie Carrière
- Univ. Grenoble-Alpes, CEA, CNRS, SyMMES-CIBEST, 17 rue des Martyrs, 38000 Grenoble, France
| | - Matthew Boyles
- Institute of Occupational Medicine (IOM), Edinburgh EH14 4AP, UK
| | - Polly McLean
- Institute of Occupational Medicine (IOM), Edinburgh EH14 4AP, UK
| | - Julia Catalán
- Finnish Institute of Occupational Health, 00250 Helsinki, Finland
- Department of Anatomy, Embryology and Genetics, University of Zaragoza, 50013 Zaragoza, Spain
| | - Alberto Katsumiti
- GAIKER Technology Centre, Basque Research and Technology Alliance (BRTA), 48170 Zamudio, Spain
| | | | | | | | | | - Isabel Rodríguez-Llopis
- GAIKER Technology Centre, Basque Research and Technology Alliance (BRTA), 48170 Zamudio, Spain
| | | | - Flemming R. Cassee
- National Institute for Public Health & the Environment (RIVM), 3721 MA Bilthoven, The Netherlands
- Institute for Risk Assessment Sciences (IRAS), Utrecht University, 3584 CS Utrecht, The Netherlands
| | - Hedwig Braakhuis
- National Institute for Public Health & the Environment (RIVM), 3721 MA Bilthoven, The Netherlands
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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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Genotoxicity of Graphene-Based Materials. NANOMATERIALS 2022; 12:nano12111795. [PMID: 35683650 PMCID: PMC9182450 DOI: 10.3390/nano12111795] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 05/17/2022] [Accepted: 05/19/2022] [Indexed: 01/27/2023]
Abstract
Graphene-based materials (GBMs) are a broad family of novel carbon-based nanomaterials with many nanotechnology applications. The increasing market of GBMs raises concerns on their possible impact on human health. Here, we review the existing literature on the genotoxic potential of GBMs over the last ten years. A total of 50 articles including in vitro, in vivo, in silico, and human biomonitoring studies were selected. Graphene oxides were the most analyzed materials, followed by reduced graphene oxides. Most of the evaluations were performed in vitro using the comet assay (detecting DNA damage). The micronucleus assay (detecting chromosome damage) was the most used validated assay, whereas only two publications reported results on mammalian gene mutations. The same material was rarely assessed with more than one assay. Despite inhalation being the main exposure route in occupational settings, only one in vivo study used intratracheal instillation, and another one reported human biomonitoring data. Based on the studies, some GBMs have the potential to induce genetic damage, although the type of damage depends on the material. The broad variability of GBMs, cellular systems and methods used in the studies precludes the identification of physico-chemical properties that could drive the genotoxicity response to GBMs.
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Vallabani NVS, Karlsson HL. Primary and Secondary Genotoxicity of Nanoparticles: Establishing a Co-Culture Protocol for Assessing Micronucleus Using Flow Cytometry. FRONTIERS IN TOXICOLOGY 2022; 4:845987. [PMID: 35295219 PMCID: PMC8915829 DOI: 10.3389/ftox.2022.845987] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 02/17/2022] [Indexed: 01/15/2023] Open
Abstract
Genotoxicity is an important endpoint to assess for understanding the risks associated with nanoparticles (NPs). Most genotoxicity studies performed on NPs have focused on primary genotoxicity analyzed by comet- or micronuclei (MN) assay using microscopic scoring. Here, we established a protocol for a more efficient version of MN assessment using flow cytometry and, importantly, both primary and secondary (inflammation-driven) genotoxicity was assessed. Human bronchial epithelial cells (HBEC-3kt) were exposed to nickel oxide (NiO) NPs directly or indirectly. The indirect exposure was done to assess secondary genotoxicity, and in this case immune cells (THP-1 derived macrophages) were exposed on inserts and the HBEC were cultured in the lower compartment. The results in monocultures showed that no increased MN formation was observed in the HBEC cells but instead a clear MN induction was noted in THP-1 cells indicating higher sensitivity. No MN formation was either observed when the HBEC were indirectly exposed, but an increase in DNA strand breaks was detected using the comet assay. Taken together, the present study emphasizes the feasibility of assessing primary and secondary genotoxicity and, furthermore, shows a clear MN induction in THP-1 monoculture following NiO NPs exposure.
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Vallabani NVS, Alijagic A, Persson A, Odnevall I, Särndahl E, Karlsson HL. Toxicity evaluation of particles formed during 3D-printing: Cytotoxic, genotoxic, and inflammatory response in lung and macrophage models. Toxicology 2022; 467:153100. [PMID: 35032623 DOI: 10.1016/j.tox.2022.153100] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 12/28/2021] [Accepted: 01/11/2022] [Indexed: 11/18/2022]
Abstract
Additive manufacturing (AM) or "3D-printing" is a ground-breaking technology that enables the production of complex 3D parts. Its rapid growth calls for immediate toxicological investigations of possible human exposures in order to estimate occupational health risks. Several laser-based powder bed fusion AM techniques are available of which many use metal powder in the micrometer range as feedstock. Large energy input from the laser on metal powders generates several by-products, like spatter and condensate particles. Due to often altered physicochemical properties and composition, spatter and condensate particles can result in different toxicological responses compared to the original powder particles. The toxicity of such particles has, however, not yet been investigated. The aim of the present study was to investigate the toxicity of condensate/spatter particles formed and collected upon selective laser melting (SLM) printing of metal alloy powders, including a nickel-chromium-based superalloy (IN939), a nickel-based alloy (Hastelloy X, HX), a high-strength maraging steel (18Ni300), a stainless steel (316L), and a titanium alloy (Ti6Al4V). Toxicological endpoints investigated included cytotoxicity, generation of reactive oxygen species (ROS), genotoxicity (comet and micronucleus formation), and inflammatory response (cytokine/chemokine profiling) following exposure of human bronchial epithelial cells (HBEC) or monocytes/macrophages (THP-1). The results showed no or minor cytotoxicity in the doses tested (10-100 μg/mL). Furthermore, no ROS generation or formation of micronucleus was observed in the HBEC cells. However, an increase in DNA strand breaks (detected by comet assay) was noted in cells exposed to HX, IN939, and Ti6Al4V, whereas no evident release of pro-inflammatory cytokine was observed from macrophages. Particle and surface characterization showed agglomeration in solution and different surface oxide compositions compared to the nominal bulk content. The extent of released nickel was small and related to the nickel content of the surface oxides, which was largely different from the bulk content. This may explain the limited toxicity found despite the high Ni bulk content of several powders. Taken together, this study suggests relatively low acute toxicity of condensates/spatter particles formed during SLM-printing using IN939, HX, 18Ni300, 316L, and Ti6Al4V as original metal powders.
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Affiliation(s)
| | - Andi Alijagic
- School of Medical Sciences, Faculty of Medicine and Health, Örebro University, SE-701 82, Örebro, Sweden; Inflammatory Response and Infection Susceptibility Centre (iRiSC), Faculty of Medicine and Health, Örebro University, SE-701 82, Örebro, Sweden
| | - Alexander Persson
- School of Medical Sciences, Faculty of Medicine and Health, Örebro University, SE-701 82, Örebro, Sweden; Inflammatory Response and Infection Susceptibility Centre (iRiSC), Faculty of Medicine and Health, Örebro University, SE-701 82, Örebro, Sweden
| | - Inger Odnevall
- KTH Royal Institute of Technology, Division of Surface and Corrosion Science, SE-100 44, Stockholm, Sweden; AIMES - Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology, Stockholm, Sweden; Department of Neuroscience, Karolinska Institutet, SE-171 77, Stockholm, Sweden
| | - Eva Särndahl
- School of Medical Sciences, Faculty of Medicine and Health, Örebro University, SE-701 82, Örebro, Sweden; Inflammatory Response and Infection Susceptibility Centre (iRiSC), Faculty of Medicine and Health, Örebro University, SE-701 82, Örebro, Sweden
| | - Hanna L Karlsson
- Institute of Environmental Medicine, Karolinska Institute, SE-171 77, Stockholm, Sweden.
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10
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Alswady-Hoff M, Erdem JS, Phuyal S, Knittelfelder O, Sharma A, Fonseca DDM, Skare Ø, Slupphaug G, Zienolddiny S. Long-Term Exposure to Nanosized TiO 2 Triggers Stress Responses and Cell Death Pathways in Pulmonary Epithelial Cells. Int J Mol Sci 2021; 22:ijms22105349. [PMID: 34069552 PMCID: PMC8161419 DOI: 10.3390/ijms22105349] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 05/14/2021] [Accepted: 05/17/2021] [Indexed: 02/03/2023] Open
Abstract
There is little in vitro data available on long-term effects of TiO2 exposure. Such data are important for improving the understanding of underlying mechanisms of adverse health effects of TiO2. Here, we exposed pulmonary epithelial cells to two doses (0.96 and 1.92 µg/cm2) of TiO2 for 13 weeks and effects on cell cycle and cell death mechanisms, i.e., apoptosis and autophagy were determined after 4, 8 and 13 weeks of exposure. Changes in telomere length, cellular protein levels and lipid classes were also analyzed at 13 weeks of exposure. We observed that the TiO2 exposure increased the fraction of cells in G1-phase and reduced the fraction of cells in G2-phase, which was accompanied by an increase in the fraction of late apoptotic/necrotic cells. This corresponded with an induced expression of key apoptotic proteins i.e., BAD and BAX, and an accumulation of several lipid classes involved in cellular stress and apoptosis. These findings were further supported by quantitative proteome profiling data showing an increase in proteins involved in cell stress and genomic maintenance pathways following TiO2 exposure. Altogether, we suggest that cell stress response and cell death pathways may be important molecular events in long-term health effects of TiO2.
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Affiliation(s)
- Mayes Alswady-Hoff
- National Institute of Occupational Health, NO-0033 Oslo, Norway; (M.A.-H.); (J.S.E.); (S.P.); (Ø.S.)
| | - Johanna Samulin Erdem
- National Institute of Occupational Health, NO-0033 Oslo, Norway; (M.A.-H.); (J.S.E.); (S.P.); (Ø.S.)
| | - Santosh Phuyal
- National Institute of Occupational Health, NO-0033 Oslo, Norway; (M.A.-H.); (J.S.E.); (S.P.); (Ø.S.)
- Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, NO-0316 Oslo, Norway
| | | | - Animesh Sharma
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway; (A.S.); (D.d.M.F.); (G.S.)
- Proteomics and Metabolomics Core Facility (PROMEC), Norwegian University of Science and Technology and the Central Norway Regional Health Authority, NO-7491 Trondheim, Norway
| | - Davi de Miranda Fonseca
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway; (A.S.); (D.d.M.F.); (G.S.)
- Proteomics and Metabolomics Core Facility (PROMEC), Norwegian University of Science and Technology and the Central Norway Regional Health Authority, NO-7491 Trondheim, Norway
| | - Øivind Skare
- National Institute of Occupational Health, NO-0033 Oslo, Norway; (M.A.-H.); (J.S.E.); (S.P.); (Ø.S.)
| | - Geir Slupphaug
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway; (A.S.); (D.d.M.F.); (G.S.)
- Proteomics and Metabolomics Core Facility (PROMEC), Norwegian University of Science and Technology and the Central Norway Regional Health Authority, NO-7491 Trondheim, Norway
| | - Shanbeh Zienolddiny
- National Institute of Occupational Health, NO-0033 Oslo, Norway; (M.A.-H.); (J.S.E.); (S.P.); (Ø.S.)
- Correspondence: ; Tel.: +47-23195284
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Younes M, Aquilina G, Castle L, Engel K, Fowler P, Frutos Fernandez MJ, Fürst P, Gundert‐Remy U, Gürtler R, Husøy T, Manco M, Mennes W, Moldeus P, Passamonti S, Shah R, Waalkens‐Berendsen I, Wölfle D, Corsini E, Cubadda F, De Groot D, FitzGerald R, Gunnare S, Gutleb AC, Mast J, Mortensen A, Oomen A, Piersma A, Plichta V, Ulbrich B, Van Loveren H, Benford D, Bignami M, Bolognesi C, Crebelli R, Dusinska M, Marcon F, Nielsen E, Schlatter J, Vleminckx C, Barmaz S, Carfí M, Civitella C, Giarola A, Rincon AM, Serafimova R, Smeraldi C, Tarazona J, Tard A, Wright M. Safety assessment of titanium dioxide (E171) as a food additive. EFSA J 2021; 19:e06585. [PMID: 33976718 PMCID: PMC8101360 DOI: 10.2903/j.efsa.2021.6585] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The present opinion deals with an updated safety assessment of the food additive titanium dioxide (E 171) based on new relevant scientific evidence considered by the Panel to be reliable, including data obtained with TiO2 nanoparticles (NPs) and data from an extended one-generation reproductive toxicity (EOGRT) study. Less than 50% of constituent particles by number in E 171 have a minimum external dimension < 100 nm. In addition, the Panel noted that constituent particles < 30 nm amounted to less than 1% of particles by number. The Panel therefore considered that studies with TiO2 NPs < 30 nm were of limited relevance to the safety assessment of E 171. The Panel concluded that although gastrointestinal absorption of TiO2 particles is low, they may accumulate in the body. Studies on general and organ toxicity did not indicate adverse effects with either E 171 up to a dose of 1,000 mg/kg body weight (bw) per day or with TiO2 NPs (> 30 nm) up to the highest dose tested of 100 mg/kg bw per day. No effects on reproductive and developmental toxicity were observed up to a dose of 1,000 mg E 171/kg bw per day, the highest dose tested in the EOGRT study. However, observations of potential immunotoxicity and inflammation with E 171 and potential neurotoxicity with TiO2 NPs, together with the potential induction of aberrant crypt foci with E 171, may indicate adverse effects. With respect to genotoxicity, the Panel concluded that TiO2 particles have the potential to induce DNA strand breaks and chromosomal damage, but not gene mutations. No clear correlation was observed between the physico-chemical properties of TiO2 particles and the outcome of either in vitro or in vivo genotoxicity assays. A concern for genotoxicity of TiO2 particles that may be present in E 171 could therefore not be ruled out. Several modes of action for the genotoxicity may operate in parallel and the relative contributions of different molecular mechanisms elicited by TiO2 particles are not known. There was uncertainty as to whether a threshold mode of action could be assumed. In addition, a cut-off value for TiO2 particle size with respect to genotoxicity could not be identified. No appropriately designed study was available to investigate the potential carcinogenic effects of TiO2 NPs. Based on all the evidence available, a concern for genotoxicity could not be ruled out, and given the many uncertainties, the Panel concluded that E 171 can no longer be considered as safe when used as a food additive.
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