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Deng J, Ding QM, Jia MX, Li W, Zuberi Z, Wang JH, Ren JL, Fu D, Zeng XX, Luo JF. Biosafety risk assessment of nanoparticles: Evidence from food case studies. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 275:116662. [PMID: 33582638 DOI: 10.1016/j.envpol.2021.116662] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 12/21/2020] [Accepted: 02/02/2021] [Indexed: 05/04/2023]
Abstract
Nanotechnology provides a wide range of benefits in the food industry in improving food tastes, textures, sensations, quality, shelf life, and food safety. Recently, potential adverse effects such as toxicity and safety concerns have been associated with the increasing use of engineered nanoparticles in food industry. Additionally, very limited information is known concerning the behavior, properties and effects of food nano-materials in the gastrointestinal tract. There is explores the current advances and provides insights of the potential risks of nanoparticles in the food industry. Specifically, characteristics of food nanoparticles and their absorption in the gastrointestinal tract, the effects of food nanoparticles against the gastrointestinal microflora, and the potential toxicity mechanisms in different organs and body systems are discussed. This review would provide references for further investigation of nano-materials toxicity effect in foods and their molecular mechanisms. It will help to develop safer foods and expand nano-materials applications in safe manner.
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Affiliation(s)
- Jing Deng
- National Engineering Laboratory for Deep Process of Rice and Byproducts, Hunan Province Key Laboratory of Edible Forestry Resources Safety and Processing Utilization, Hunan Key Laboratory of Processed Food for Special Medical Purpose, College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, Hunan, China; College of Packaging and Material Engineering, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China
| | - Quan Ming Ding
- College of Packaging and Material Engineering, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China
| | - Ming Xi Jia
- National Engineering Laboratory for Deep Process of Rice and Byproducts, Hunan Province Key Laboratory of Edible Forestry Resources Safety and Processing Utilization, Hunan Key Laboratory of Processed Food for Special Medical Purpose, College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, Hunan, China
| | - Wen Li
- National Engineering Laboratory for Deep Process of Rice and Byproducts, Hunan Province Key Laboratory of Edible Forestry Resources Safety and Processing Utilization, Hunan Key Laboratory of Processed Food for Special Medical Purpose, College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, Hunan, China; College of Packaging and Material Engineering, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China.
| | - Zavuga Zuberi
- Department of Science and Laboratory Technology, Dar Es Salaam Institute of Technology, P.O. Box 2958, Dar Es Salaam, Tanzania
| | - Jian Hui Wang
- School of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
| | - Jia Li Ren
- National Engineering Laboratory for Deep Process of Rice and Byproducts, Hunan Province Key Laboratory of Edible Forestry Resources Safety and Processing Utilization, Hunan Key Laboratory of Processed Food for Special Medical Purpose, College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, Hunan, China
| | - Da Fu
- Central Laboratory for Medical Research, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, 200072, China
| | - Xiao Xi Zeng
- College of Packaging and Material Engineering, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China
| | - Jun Fei Luo
- National Engineering Laboratory for Deep Process of Rice and Byproducts, Hunan Province Key Laboratory of Edible Forestry Resources Safety and Processing Utilization, Hunan Key Laboratory of Processed Food for Special Medical Purpose, College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, Hunan, China
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Toxicological Consequences of Titanium Dioxide Nanoparticles (TiO 2NPs) and Their Jeopardy to Human Population. BIONANOSCIENCE 2021; 11:621-632. [PMID: 33520589 PMCID: PMC7835448 DOI: 10.1007/s12668-021-00836-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2021] [Indexed: 01/31/2023]
Abstract
Titanium dioxide nanoparticles (TiO2 NPs) are the most produced nanomaterial for food additives, pigments, photocatalysis, and personal care products. These nanomaterials are at the forefront of rapidly developing indispensable nanotechnology. In all these nanomaterials, titanium dioxide (TiO2) is the most common nanomaterial which is being synthesized for many years. These nanoparticles of TiO2 are widely used at the commercial level, especially in cosmetic industries. High usage in such a way has increased the toxicological consequences of the human population. Several studies have shown that TiO2 NPs accumulated after oral exposure or inhalation in the alimentary canal, lungs, heart, liver, spleen, cardiac muscle, and kidneys. Additionally, in mice and rats, they disturb glucose and lipid homeostasis. Moreover, TiO2 nanoparticles primarily cause adverse reactions by inducing oxidative stress that leads to cell damage, inflammation, genotoxicity, and adverse immune responses. The form and level of destruction are strongly based on the physical and chemical properties of TiO2 nanoparticles, which administer their reactivity and bioavailability. Studies give indications that TiO2 NPs cause both DNA strand breaks and chromosomal damages. The effects of genotoxicity do not depend only on particle surface changes, size, and exposure route, but also relies on the duration of exposure. Most of these effects may be because of a very high dose of TiO2 NPs. Despite increased production and use, epidemiological data for TiO2 NPs is still missing. This review discusses previous research regarding the impact of TiO2 NP toxicity on human health and highlights areas that require further understanding in concern of jeopardy to the human population. This review is important to point out areas where extensive research is needed; thus, their possible impact on individual health should be investigated in more details.
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Agnihotri R, Gaur S, Albin S. Nanometals in Dentistry: Applications and Toxicological Implications-a Systematic Review. Biol Trace Elem Res 2020; 197:70-88. [PMID: 31782063 DOI: 10.1007/s12011-019-01986-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 11/14/2019] [Indexed: 01/28/2023]
Abstract
Nanotechnology is a vital part of health care system, including the dentistry. This branch of technology has been incorporated into various fields of dentistry ranging from diagnosis to prevention and treatment. The latter involves application of numerous biomaterials that help in restoration of esthetic and functional dentition. Over the past decade, these materials were modified through the incorporation of metal nanoparticles (NP) like silver (Ag), gold (Au), titanium (Ti), zinc (Zn), copper (Cu), and zirconia (Zr). They enhanced antimicrobial, mechanical, and regenerative properties of these materials. However, lately, the toxicological implications of these nanometal particles have been realized. They were associated with cytotoxicity, genotoxicity altered inflammatory processes, and reticuloendothelial system toxicity. As dental biomaterials containing metal NPs remain functional in oral cavity over prolonged periods, it is important to know their toxicological effects in humans. With this background, the present systematic review is aimed to gain an insight into the plausible applications and toxic implications of nano-metal particles as related to dentistry.
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Affiliation(s)
- Rupali Agnihotri
- Department of Periodontology, Manipal College of Dental Sciences, Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, 576104, India
| | - Sumit Gaur
- Department of Pedodontics and Preventive Dentistry, Manipal College of Dental Sciences, Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, 576104, India.
| | - Sacharia Albin
- Engineering Department, Norfolk State University, Norfolk, VA, 23504, USA
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Liao C, Li Y, Tjong SC. Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E124. [PMID: 31936581 PMCID: PMC7022691 DOI: 10.3390/nano10010124] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/04/2020] [Accepted: 01/06/2020] [Indexed: 12/16/2022]
Abstract
This article provides an overview of current research into the development, synthesis, photocatalytic bacterial activity, biocompatibility and cytotoxic properties of various visible-light active titanium dioxide (TiO2) nanoparticles (NPs) and their nanocomposites. To achieve antibacterial inactivation under visible light, TiO2 NPs are doped with metal and non-metal elements, modified with carbonaceous nanomaterials, and coupled with other metal oxide semiconductors. Transition metals introduce a localized d-electron state just below the conduction band of TiO2 NPs, thereby narrowing the bandgap and causing a red shift of the optical absorption edge into the visible region. Silver nanoparticles of doped TiO2 NPs experience surface plasmon resonance under visible light excitation, leading to the injection of hot electrons into the conduction band of TiO2 NPs to generate reactive oxygen species (ROS) for bacterial killing. The modification of TiO2 NPs with carbon nanotubes and graphene sheets also achieve the efficient creation of ROS under visible light irradiation. Furthermore, titanium-based alloy implants in orthopedics with enhanced antibacterial activity and biocompatibility can be achieved by forming a surface layer of Ag-doped titania nanotubes. By incorporating TiO2 NPs and Cu-doped TiO2 NPs into chitosan or the textile matrix, the resulting polymer nanocomposites exhibit excellent antimicrobial properties that can have applications as fruit/food wrapping films, self-cleaning fabrics, medical scaffolds and wound dressings. Considering the possible use of visible-light active TiO2 nanomaterials for various applications, their toxicity impact on the environment and public health is also addressed.
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Affiliation(s)
- Chengzhu Liao
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yuchao Li
- Department of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, China;
| | - Sie Chin Tjong
- Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, China
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Montalvo-Quiros S, Luque-Garcia JL. Combination of bioanalytical approaches and quantitative proteomics for the elucidation of the toxicity mechanisms associated to TiO2 nanoparticles exposure in human keratinocytes. Food Chem Toxicol 2019; 127:197-205. [DOI: 10.1016/j.fct.2019.03.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 02/27/2019] [Accepted: 03/19/2019] [Indexed: 02/08/2023]
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Hepatic and Renal Toxicity Induced by TiO 2 Nanoparticles in Rats: A Morphological and Metabonomic Study. J Toxicol 2019; 2019:5767012. [PMID: 30941172 PMCID: PMC6421043 DOI: 10.1155/2019/5767012] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 11/13/2018] [Accepted: 01/21/2019] [Indexed: 12/29/2022] Open
Abstract
Titanium dioxide (TiO2) nanoparticles (NPs) are produced abundantly and are frequently used as a white pigment in the manufacture of paints, foods, paper, and toothpaste. Despite the wide ranges of uses, there is a lack of information on the impact of NPs on animal and human health. In the present study, rats were exposed to different doses of TiO2 nanoparticles and sacrificed, respectively, 4 days, 1 month, and 2 months after treatment. Dosage of TiO2 in tissues was performed by ICP-AES and revealed an important accumulation of TiO2 in the liver. The nanoparticles induced morphological and physiological alterations in liver and kidney. In the liver, these alterations mainly affect the hepatocytes located around the centrilobular veins. These cells were the site of an oxidative stress evidenced by immunocytochemical detection of 4-hydroxynonenal (4-HNE). Kupffer cells are also the site of an important oxidative stress following the massive internalization of TiO2 nanoparticles. Enzymatic markers of liver and kidney functions (such as AST and uric acid) are also disrupted only in animals exposed to highest doses. The metabonomic approach allowed us to detect modifications in urine samples already detectable after 4 days in animals treated at the lowest dose. This metabonomic pattern testifies an oxidative stress as well as renal and hepatic alterations.
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Sramkova M, Kozics K, Masanova V, Uhnakova I, Razga F, Nemethova V, Mazancova P, Kapka-Skrzypczak L, Kruszewski M, Novotova M, Puntes VF, Gabelova A. Kidney nanotoxicity studied in human renal proximal tubule epithelial cell line TH1. Mutat Res 2019; 845:403017. [PMID: 31561890 DOI: 10.1016/j.mrgentox.2019.01.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 11/27/2018] [Accepted: 01/17/2019] [Indexed: 11/29/2022]
Abstract
Progressive expansion of nanomaterials in our everyday life raises concerns about their safety for human health. Although kidneys are the primary organs of xenobiotic elimination, little attention has been paid to the kidneys in terms of nanotoxicological studies up to now. Here we investigate the cytotoxic and genotoxic potential of four solid-core uncoated inorganic nanoparticles (TiO2NPs, SiO2NPs, Fe3O4NPs and AuNPs) using the human renal proximal tubule epithelial TH1 cells. To mimic the in vivo conditions more realistic, TH1 cells were exposed in vitro to inorganic NPs under static as well as dynamic conditions for 3 h and 24 h. The medium throughput alkaline comet assay (12 minigels per slide) was employed to evaluate the impact of these NPs on genome integrity and their capacity to produce oxidative lesions to DNA. The accumulation and localization of studied inorganic NPs inside the cells was monitored by transmission electron microscopy (TEM) and the efficacy of internalization of particular NPs was determined by atomic absorption spectroscopy (AAS) and inductively coupled plasma mass spectrometry (ICP-MS). From all the tested NPs, only Fe3O4NPs induced a slight cytotoxicity in TH1 cells exposed to high concentrations (>700 μg/ml) for 24 h. On the other hand, the inorganic NPs did not increase significantly the level of DNA strand breaks or oxidative DNA damage regardless of the treatment mode (static vs. dynamic conditions). Interestingly, substantial differences were observed in the internalized amount of inorganic NPs in TH1 cells exposed to equivalent (2.2 μg/ml) concentration. Fe3O4NPs were most efficiently taken up while the lowest quantity of particles was determined in TiO2NPs-treated cells. As the particle size and shape of individual inorganic NPs in culture medium was nearly identical, it is reasonable to suppose that the chemical composition may contribute to the differences in the efficacy of NPs uptake.
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Affiliation(s)
- Monika Sramkova
- Cancer Research Institute, Biomedical Research Center SAS, Dubravska cesta 9, 845 05, Bratislava, Slovakia.
| | - Katarina Kozics
- Cancer Research Institute, Biomedical Research Center SAS, Dubravska cesta 9, 845 05, Bratislava, Slovakia
| | - Vlasta Masanova
- Slovak Medical University, Limbova 12, 833 03, Bratislava, Slovakia
| | - Iveta Uhnakova
- Slovak Medical University, Limbova 12, 833 03, Bratislava, Slovakia
| | - Filip Razga
- Polymer Institute SAS, Dubravska cesta 9, 845 41, Bratislava, Slovakia; Selecta Biotech SE, Heydukova 2138/1, 811 08, Bratislava, Slovakia
| | - Veronika Nemethova
- Polymer Institute SAS, Dubravska cesta 9, 845 41, Bratislava, Slovakia; Selecta Biotech SE, Heydukova 2138/1, 811 08, Bratislava, Slovakia
| | - Petra Mazancova
- Polymer Institute SAS, Dubravska cesta 9, 845 41, Bratislava, Slovakia; Selecta Biotech SE, Heydukova 2138/1, 811 08, Bratislava, Slovakia
| | - Lucyna Kapka-Skrzypczak
- Department of Molecular Biology and Translational Research, Institute of Rural Health, Jaczewskiego 2, 20-090, Lublin, Poland; Department of Medical Biology and Translational Research, Faculty of Medicine, University of Information Technology and Management, Sucharskiego 2, 35-225, Rzeszów, Poland
| | - Marcin Kruszewski
- Department of Molecular Biology and Translational Research, Institute of Rural Health, Jaczewskiego 2, 20-090, Lublin, Poland; Department of Medical Biology and Translational Research, Faculty of Medicine, University of Information Technology and Management, Sucharskiego 2, 35-225, Rzeszów, Poland; Centre for Radiobiology and Biological Dosimetry, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195, Warsaw, Poland
| | - Marta Novotova
- Institute of Experimental Endocrinology, Biomedical Research Center SAS, Dubravska cesta 9, 845 05, Bratislava, Slovakia
| | - Victor F Puntes
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193, Barcelona, Spain
| | - Alena Gabelova
- Cancer Research Institute, Biomedical Research Center SAS, Dubravska cesta 9, 845 05, Bratislava, Slovakia
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Lee MY. Essential Oils as Repellents against Arthropods. BIOMED RESEARCH INTERNATIONAL 2018; 2018:6860271. [PMID: 30386794 PMCID: PMC6189689 DOI: 10.1155/2018/6860271] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 09/06/2018] [Indexed: 12/31/2022]
Abstract
The development of effective and safe repellents against arthropods is very important, because there are no effective vaccines against arthropod-borne viruses (arboviruses) and parasites. Arboviruses and parasites are transmitted to humans from arthropods, and mosquitoes are the most common arthropods associated with dengue, malaria, and yellow fever. Enormous efforts have been made to develop effective repellents against arthropods, and thus far synthetic repellents have been widely used. However, the use of synthetic repellents has raised several concerns in terms of environmental and human health risks and safety. Thus, plant essential oils (EOs) have been widely used as an alternative to synthetic repellents. In this review, we briefly introduce and summarize recent studies that have investigated EOs as insect repellents. Current technology and research trends to develop effective and safe repellents from plant EOs are also described in this review.
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Affiliation(s)
- Mi Young Lee
- Department of Medical Biotechnology, Soonchunhyang University, 22 Soonchunhyang–ro, Asan, Chungnam 31537, Republic of Korea
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Valentini X, Deneufbourg P, Paci P, Rugira P, Laurent S, Frau A, Stanicki D, Ris L, Nonclercq D. Morphological alterations induced by the exposure to TiO 2 nanoparticles in primary cortical neuron cultures and in the brain of rats. Toxicol Rep 2018; 5:878-889. [PMID: 30175048 PMCID: PMC6118103 DOI: 10.1016/j.toxrep.2018.08.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 08/09/2018] [Accepted: 08/12/2018] [Indexed: 12/17/2022] Open
Abstract
Nowadays, nanoparticles (NPs) of titanium dioxide (TiO2) are abundantly produced. TiO2 NPs are present in various food products, in paints, cosmetics, sunscreens and toothpastes. However, the toxicity of TiO2 NPs on the central nervous system has been poorly investigated until now. The aim of this study was to evaluate the toxicity of TiO2 NPs on the central nervous system in vitro and in vivo. In cell cultures derived from embryonic cortical brain of rats, a significant decrease in neuroblasts was observed after 24 to 96 h of incubation with TiO2 NPs (5 to 20 μg/ml). This phenomenon resulted from an inhibition of neuroblast proliferation and a concomitant increase in apoptosis. In the same time, a gliosis, characterized by an increase in proliferation of astrocytes and the hypertrophy of microglial cells, occurred. The phagocytosis of TiO2 NPs by microgliocytes was also observed. In vivo, after intraperitoneal injection, the TiO2 NPs reached the brain through the blood brain barrier and the nanoparticles promoted various histological injuries such as cellular lysis, neuronal apoptosis, and inflammation. A reduction of astrocyte population was observed in some brain area such as plexiform zone, cerebellum and subependymal area. An oxidative stress was also detected by immunohistochemistry in neurons of hippocampus, cerebellum and in subependymal area. In conclusion, our study demonstrated clearly the toxic impact of TiO2 NPs on rat brain and neuronal cells and pointed about not yet referenced toxicity impacts of TiO2 such as the reduction of neuroblast proliferation both in vitro and in vivo.
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Key Words
- 4-HNE, 4-hydroxynonenal
- ATP, adenosine triphosphate
- BBB, blood-brain barrier
- Brain
- BrdU, 5-Bromo-2′-deoxyuridine
- CNS, central nervous system
- Cell culture
- DLS, dynamic light scattering
- FBS, fetal bovine serum
- GFAP, glial fibrillary acidic protein
- HBSS, Hank's balanced salt solution
- IL-10, interleukin-10
- IL-1β, interleukin-1β
- IP, intraperitoneal
- MAP2, microtubule-associated protein 2
- MDA, malondialdehyde
- NMDA, N-methyl-D-aspartate
- NO, nitric oxide
- NOS, nitric oxide synthase
- NPs, nanoparticles
- Nanoparticles
- Oxidative stress
- Proliferation
- ROS, reactive oxygen species
- SEM, standard error of the mean
- TNF-α, tumor necrosis factor-α
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Affiliation(s)
- Xavier Valentini
- Laboratory of Histology, University of Mons, Institute for Health Sciences and Technology, Faculty of Medicine and Pharmacy, 23, Place du Parc, B-7000 Mons, Belgium
| | - Pauline Deneufbourg
- Laboratory of Neurosciences, University of Mons, Institute for Health Sciences and Technology, Faculty of Medicine and Pharmacy, 23, Place du Parc, B-7000 Mons, Belgium
| | - Paula Paci
- Laboratory of Neurosciences, University of Mons, Institute for Health Sciences and Technology, Faculty of Medicine and Pharmacy, 23, Place du Parc, B-7000 Mons, Belgium
| | - Pascaline Rugira
- Laboratory of Histology, University of Mons, Institute for Health Sciences and Technology, Faculty of Medicine and Pharmacy, 23, Place du Parc, B-7000 Mons, Belgium
| | - Sophie Laurent
- Laboratory of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory, University of Mons, Institute for Health Sciences and Technology, Institute of Biosciences, Faculty of Medicine and Pharmacy, 23, Place du Parc, B-7000 Mons, Belgium
- Center for Microscopy and Molecular Imaging (CMMI), B-6041 Gosselies, Belgium
| | - Annica Frau
- Laboratory of Histology, University of Mons, Institute for Health Sciences and Technology, Faculty of Medicine and Pharmacy, 23, Place du Parc, B-7000 Mons, Belgium
| | - Dimitri Stanicki
- Laboratory of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory, University of Mons, Institute for Health Sciences and Technology, Institute of Biosciences, Faculty of Medicine and Pharmacy, 23, Place du Parc, B-7000 Mons, Belgium
| | - Laurence Ris
- Laboratory of Neurosciences, University of Mons, Institute for Health Sciences and Technology, Faculty of Medicine and Pharmacy, 23, Place du Parc, B-7000 Mons, Belgium
| | - Denis Nonclercq
- Laboratory of Histology, University of Mons, Institute for Health Sciences and Technology, Faculty of Medicine and Pharmacy, 23, Place du Parc, B-7000 Mons, Belgium
- Corresponding author at: 6, Avenue du Champ de Mars, Mons, 7000, Belgium.
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