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Ağaç DK, Oktay E, Onuk B, Kabak M, Gündemir O. Shape variation in cranium, mandible and teeth in selected mouse strains. Anat Histol Embryol 2024; 53:e13064. [PMID: 38841825 DOI: 10.1111/ahe.13064] [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: 05/06/2024] [Revised: 05/15/2024] [Accepted: 05/16/2024] [Indexed: 06/07/2024]
Abstract
There are different strains of laboratory mouse used in many different fields. These strains differ anatomically. In order to determine these anatomical differences, shape analysis was conducted according to species. CD-1, C57bl/6 and Balb-c strains were preferred to study these differences. Forty-eight adult mouse strains belonging to these strains were utilized. The bones were photographed and geometric morphometry was applied to these photographs. Principal Component Analysis was applied to determine shape variations. In Principal component 1 for cranium, CD-1 and C57bl/6 strain groups showed different shape variations, while Balb-c strain group showed similar shape variations to the other strain groups. Principal Component 1 for the mandible separated the CD-1 and C57bl/6 strain groups in terms of shape variation. Principal Component 2 explained most of the variation between the C57bl/6 and CD-1 lineage groups. In PC1 for molars, the CD-1 group showed a different shape variation from the other groups. Mahalanobis distances and Procrustes distances were measured using Canonical variance analysis to explain the differences between the lineage groups. These measurements were statistically significant. For cranium, in canonical variate 1, CD-1 group of mouse and Balb-c group of mouse were separated from each other. In canonical variate 2, C57bl/6 group of mouse were separated from the other groups. For mandible, Balb-c group of mouse in canonical variate 1 and CD-1 group of mouse in canonical variate 2 were separated from the other groups. For molars, CD-1 group of mouse in canonical variate 1 and Balb-c group of mouse in canonical variate 2 were separated from the other groups. It was thought that these anatomical differences could be caused by genotypic factors as well as dietary differences and many different habits that would affect the way their muscles work.
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Affiliation(s)
- Duygu Küçük Ağaç
- Department of Veterinary, Şiran Mustafa Beyaz Vocational School, Gümüşhane University, Gumushane, Turkey
| | - Ece Oktay
- Institute of Graduate Studies, Istanbul University-Cerrahpaşa, Istanbul, Turkey
| | - Burcu Onuk
- Department of Anatomy, Faculty of Veterinary Medicine, Ondokuz Mayıs University, Samsun, Turkey
| | - Murat Kabak
- Department of Anatomy, Faculty of Veterinary Medicine, Ondokuz Mayıs University, Samsun, Turkey
| | - Ozan Gündemir
- Department of Anatomy, Faculty of Veterinary Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey
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2
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Park SH, Kim G, Yang GE, Yun HJ, Shin TH, Kim ST, Lee K, Kim HS, Kim SH, Leem SH, Cho WS, Lee JH. Disruption of phosphofructokinase activity and aerobic glycolysis in human bronchial epithelial cells by atmospheric ultrafine particulate matter. JOURNAL OF HAZARDOUS MATERIALS 2024; 464:132966. [PMID: 37976851 DOI: 10.1016/j.jhazmat.2023.132966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 10/28/2023] [Accepted: 11/07/2023] [Indexed: 11/19/2023]
Abstract
Exposure to ambient ultrafine particulate matter (UPM) causes respiratory disorders; however, the underlying molecular mechanisms remain unclear. In this study, we synthesized simulated UPM (sUPM) with controlled physicochemical properties using the spark-discharge method. Subsequently, we investigated the biological effects of sUPM using BEAS-2B human bronchial epithelial cells (HBECs) and a mouse intratracheal instillation model. High throughput RNA-sequencing and bioinformatics analyses revealed that dysregulation of the glycolytic metabolism is involved in the inhibited proliferation and survival of HBECs by sUPM treatment. Furthermore, signaling pathway and enzymatic analyses showed that the treatment of BEAS-2B cells with sUPM induces the inactivation of extracellular signal-regulated kinase (ERK) and protein kinase B (PKB, also known as AKT), resulting in the downregulation of phosphofructokinase 2 (PFK2) S483 phosphorylation, PFK enzyme activity, and aerobic glycolysis in HBECs in an oxidative stress-independent manner. Additionally, intratracheal instillation of sUPM reduced the phosphorylation of ERK, AKT, and PFK2, decreased proliferation, and increased the apoptosis of bronchial epithelial cells in mice. The findings of this study imply that UPM induces pulmonary toxicity by disrupting aerobic glycolytic metabolism in lung epithelial cells, which can provide novel insights into the toxicity mechanisms of UPM and strategies to prevent their toxic effects.
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Affiliation(s)
- Su Hwan Park
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Gyuri Kim
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Gi-Eun Yang
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Hye Jin Yun
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Tae Hwan Shin
- Department of Biomedical Sciences, Dong-A University, Busan 49315, Republic of Korea
| | - Sun Tae Kim
- Department of Plant Bioscience, Life and Industry Convergence Research Institute, Pusan National University, Miryang 50463, Republic of Korea
| | - Kyuhong Lee
- Inhalation Toxicology Center for Airborne Risk Factor, Korea Institute of Toxicology, 30 Baehak1-gil, Jeongeup, Jeollabuk-do, 56212, Republic of Korea
| | - Hyuk Soon Kim
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea; Department of Biomedical Sciences, Dong-A University, Busan 49315, Republic of Korea
| | - Seok-Ho Kim
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea
| | - Sun-Hee Leem
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea; Department of Biomedical Sciences, Dong-A University, Busan 49315, Republic of Korea.
| | - Wan-Seob Cho
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea.
| | - Jong-Ho Lee
- Department of Health Sciences, The Graduate School of Dong-A University, Busan 49315, Republic of Korea; Department of Biomedical Sciences, Dong-A University, Busan 49315, Republic of Korea.
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Lee MKH, Lim HK, Su C, Koh JYC, Setyawati MI, Ng KW, Hou HW, Tay CY. 3D Airway Epithelial-Fibroblast Biomimetic Microfluidic Platform to Unravel Engineered Nanoparticle-Induced Acute Stress Responses as Exposome Determinants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:19223-19235. [PMID: 37933439 DOI: 10.1021/acs.est.3c03678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2023]
Abstract
Insights into how biological systems respond to high- and low-dose acute environmental stressors are a fundamental aspect of exposome research. However, studying the impact of low-level environmental exposure in conventional in vitro settings is challenging. This study employed a three-dimensional (3D) biomimetic microfluidic lung-on-chip (μLOC) platform and RNA-sequencing to examine the effects of two model anthropogenic engineered nanoparticles (NPs): zinc oxide nanoparticles (Nano-ZnO) and copier center nanoparticles (Nano-CCP). The airway epithelium exposed to these NPs exhibited dose-dependent increases in cytotoxicity and barrier dysregulation (dominance of the external exposome). Interestingly, even nontoxic and low-level exposure (10 μg/mL) of the epithelium compartment to Nano-ZnO triggered chemotaxis of lung fibroblasts toward the epithelium. An increase in α smooth muscle actin (α-SMA) expression and contractile activity was also observed in these cells, indicating a bystander-like adaptive response (dominance of internal exposome). Further bioinformatics and network analysis showed that a low-dose Nano-ZnO significantly induced a robust transcriptomic response and upregulated several hub genes associated with the development of lung fibrosis. We propose that Nano-ZnO, even at a no observable effect level (NOEL) dose according to conventional standards, can function as a potent nanostressor to disrupt airway epithelium homeostasis. This leads to a cascade of profibrotic events in a cross-tissue compartment fashion. Our findings offer new insights into the early acute events of respiratory harm associated with environmental NPs exposure, paving the way for better exposomic understanding of this emerging class of anthropogenic nanopollutants.
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Affiliation(s)
- Melissa Kao Hui Lee
- School of Materials Science and Engineering, Nanyang Technological University, N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Hong Kit Lim
- School of Materials Science and Engineering, Nanyang Technological University, N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Chengxun Su
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University, 11 Mandalay Road, Clinical Sciences Building Level 11, Singapore 308232, Singapore
| | - Jie Yan Cheryl Koh
- School of Materials Science and Engineering, Nanyang Technological University, N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore
- Nanyang Environment & Water Research Institute, 1 CleanTech Loop, CleanTech One, Singapore 637141, Singapore
| | - Magdiel Inggrid Setyawati
- School of Materials Science and Engineering, Nanyang Technological University, N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Kee Woei Ng
- School of Materials Science and Engineering, Nanyang Technological University, N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore
- Nanyang Environment & Water Research Institute, 1 CleanTech Loop, CleanTech One, Singapore 637141, Singapore
- Center for Sustainable Materials (SusMat), Nanyang Technological University, Singapore 637553, Singapore
| | - Han Wei Hou
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University, 11 Mandalay Road, Clinical Sciences Building Level 11, Singapore 308232, Singapore
| | - Chor Yong Tay
- School of Materials Science and Engineering, Nanyang Technological University, N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore
- Nanyang Environment & Water Research Institute, 1 CleanTech Loop, CleanTech One, Singapore 637141, Singapore
- Center for Sustainable Materials (SusMat), Nanyang Technological University, Singapore 637553, Singapore
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Lyu L, Xu Y, Wang H, Guo X, Gao Y, Duan S, Deng F, Guo X, Wang Y. Changes in heart rate variability of healthy subjects shortly exposed to printing shop particles and the effect of air purifier intervention. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 315:120418. [PMID: 36257562 DOI: 10.1016/j.envpol.2022.120418] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 10/07/2022] [Accepted: 10/08/2022] [Indexed: 06/16/2023]
Abstract
Particulate matter (PM) released by printers may cause airway inflammation and cardiac electrophysiological changes. We conducted a two-stage crossover study to examine the association between short-term exposure to printing shop particles (PSPs) and the heart rate variability (HRV) among healthy volunteers, as well as to evaluate the effect of air purifier intervention. The on-site assessments of PSPs and individual HRV parameters of the volunteers were used to analyze the influence of size-fractionated PSPs and air purifier intervention on HRV at different lag times after PSPs exposure (0 min, 5 min, 15 min, and 30 min) by using the linear mixed-effects models. We observed that changes in 6 HRV parameters were associated with particle mass concentration (PMC) of PSPs, and changes in 8 HRV parameters were associated with particle number concentration (PNC) of PSPs. The sensitive HRV parameters were the square root of the mean of the sum of the squares of differences between adjacent NN intervals (rMSSD), NN50 count divided by the total number of all NN intervals (pNN50), normalized high frequency power (nHF), very high frequency power (VHF), normalized low frequency power (nLF), and the ratio of low frequency power to high frequency power (LF/HF). Most HRV parameters exhibited the strongest effect associated with PMC and PNC at a lag time of 30 min. The air purifier intervention markedly reduced the PNC and PMC of size-fractionated PSPs, enhanced 5 HRV parameters, and decreased the nLF and LF/HF. Our study suggests that short-term exposure to PSPs can affect HRV parameters, reflecting changes in cardiac autonomic nervous activity, and the use of an air purifier can reduce the concentration of PSPs and improve the autonomic nervous system activity of the exposed individuals.
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Affiliation(s)
- Lizhi Lyu
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, 38 Xueyuan Road, Haidian District, Beijing, 100191, PR China
| | - Yu Xu
- Department of Respiratory Medicine, Beijing Jishuitan Hospital, Beijing, 100035, PR China
| | - Hongbo Wang
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, 38 Xueyuan Road, Haidian District, Beijing, 100191, PR China
| | - Xin Guo
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, 38 Xueyuan Road, Haidian District, Beijing, 100191, PR China
| | - Yanjun Gao
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, 38 Xueyuan Road, Haidian District, Beijing, 100191, PR China
| | - Shumin Duan
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, 38 Xueyuan Road, Haidian District, Beijing, 100191, PR China
| | - Furong Deng
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, 38 Xueyuan Road, Haidian District, Beijing, 100191, PR China
| | - Xinbiao Guo
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, 38 Xueyuan Road, Haidian District, Beijing, 100191, PR China
| | - Yun Wang
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, 38 Xueyuan Road, Haidian District, Beijing, 100191, PR China.
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5
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DeLoid GM, Cao X, Coreas R, Bitounis D, Singh D, Zhong W, Demokritou P. Incineration-Generated Polyethylene Micro-Nanoplastics Increase Triglyceride Lipolysis and Absorption in an In Vitro Small Intestinal Epithelium Model. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:12288-12297. [PMID: 35973094 PMCID: PMC9559972 DOI: 10.1021/acs.est.2c03195] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Despite mounting evidence of micro-nanoplastics (MNPs) in food and drinking water, little is known of the potential health risks of ingested MNPs, and nothing is known of their potential impact on nutrient digestion and absorption. We assessed the effects of environmentally relevant secondary MNPs generated by incineration of polyethylene (PE-I), on digestion and absorption of fat in a high fat food model using a 3-phase in vitro simulated digestion coupled with a tri-culture small intestinal epithelium model. The presence of 400 μg/mL PE-I increased fat digestion by 33% and increased fat absorption by 147 and 145% 1 and 2 h after exposure. Analysis of the PE-I lipid corona during digestion revealed predominantly triacylglycerols with enrichment of fatty acids in the small intestinal phase. Protein corona analysis showed enrichment of triacylglycerol lipase and depletion of β-casein in the small intestinal phase. These findings suggest digestion of triacylglycerol by lipase on the surface of lipid-coated MNPs as a potential mechanism. Further studies are needed to investigate the mechanisms underlying the greater observed increase in fat absorption, to verify these results in an animal model, and to determine the MNP properties governing their effects on lipid digestion and absorption.
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Affiliation(s)
- Glen M DeLoid
- Nanoscience and Advanced Materials Center, Environmental and Occupational Health Sciences Institute (EOHSI) and School of Public Health, Rutgers University, Piscataway, NJ 08854, USA
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Xiaoqiong Cao
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Roxana Coreas
- Environmental Toxicology Graduate Program, University of California, Riverside, CA 92521, USA
| | - Dimitrios Bitounis
- Nanoscience and Advanced Materials Center, Environmental and Occupational Health Sciences Institute (EOHSI) and School of Public Health, Rutgers University, Piscataway, NJ 08854, USA
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Dilpreet Singh
- Nanoscience and Advanced Materials Center, Environmental and Occupational Health Sciences Institute (EOHSI) and School of Public Health, Rutgers University, Piscataway, NJ 08854, USA
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Wenwan Zhong
- Environmental Toxicology Graduate Program, University of California, Riverside, CA 92521, USA
- Department of Chemistry, University of California, Riverside, CA 92521, USA
| | - Philip Demokritou
- Nanoscience and Advanced Materials Center, Environmental and Occupational Health Sciences Institute (EOHSI) and School of Public Health, Rutgers University, Piscataway, NJ 08854, USA
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
- Environmental Toxicology Graduate Program, University of California, Riverside, CA 92521, USA
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6
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Bitounis D, Huang Q, Toprani SM, Setyawati MI, Oliveira N, Wu Z, Tay CY, Ng KW, Nagel ZD, Demokritou P. Printer center nanoparticles alter the DNA repair capacity of human bronchial airway epithelial cells. NANOIMPACT 2022; 25:100379. [PMID: 35559885 PMCID: PMC9661631 DOI: 10.1016/j.impact.2022.100379] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 12/08/2021] [Accepted: 01/05/2022] [Indexed: 05/26/2023]
Abstract
Nano-enabled, toner-based printing equipment emit nanoparticles during operation. The bioactivity of these nanoparticles as documented in a plethora of published toxicological studies raises concerns about their potential health effects. These include pro-inflammatory effects that can lead to adverse epigenetic alterations and cardiovascular disorders in rats. At the same time, their potential to alter DNA repair pathways at realistic doses remains unclear. In this study, size-fractionated, airborne particles from a printer center in Singapore were sampled and characterized. The PM0.1 size fraction (particles with an aerodynamic diameter less than 100 nm) of printer center particles (PCP) were then administered to human lung adenocarcinoma (Calu-3) or lymphoblastoid (TK6) cells. We evaluated plasma membrane integrity, mitochondrial activity, and intracellular reactive oxygen species (ROS) generation. Moreover, we quantified DNA damage and alterations in the cells' capacity to repair 6 distinct types of DNA lesions. Results show that PCP altered the ability of Calu-3 cells to repair 8oxoG:C lesions and perform nucleotide excision repair, in the absence of acute cytotoxicity or DNA damage. Alterations in DNA repair capacity have been correlated with the risk of various diseases, including cancer, therefore further genotoxicity studies are needed to assess the potential risks of PCP exposure, at both occupational settings and at the end-consumer level.
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Affiliation(s)
- Dimitrios Bitounis
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 655 Huntington Ave, Boston, MA 02115, USA
| | - Qiansheng Huang
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 655 Huntington Ave, Boston, MA 02115, USA; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Sneh M Toprani
- John B. Little Center of Radiation Sciences, Department of Environmental Health, Harvard T H Chan School of Public Health, Boston, MA 02115, USA
| | - Magdiel I Setyawati
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Nathalia Oliveira
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 655 Huntington Ave, Boston, MA 02115, USA
| | - Zhuoran Wu
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Chor Yong Tay
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; Environmental Chemistry and Materials Centre, Nanyang Environment and Water Research Institution, 1 Cleantech Loop, CleanTech One, Singapore 637141, Singapore; School of Biological Sciences, Nanyang Technological University, 637551, Singapore
| | - Kee Woei Ng
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 655 Huntington Ave, Boston, MA 02115, USA; School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; Environmental Chemistry and Materials Centre, Nanyang Environment and Water Research Institution, 1 Cleantech Loop, CleanTech One, Singapore 637141, Singapore
| | - Zachary D Nagel
- John B. Little Center of Radiation Sciences, Department of Environmental Health, Harvard T H Chan School of Public Health, Boston, MA 02115, USA.
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 655 Huntington Ave, Boston, MA 02115, USA.
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7
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Bello D, Chanetsa L, Cristophi CA, Poh TY, Singh D, Setyawati MI, Christiani D, Chotirmall SH, Ng KW, Demokritou P. Chronic upper airway and systemic inflammation from copier emitted particles in healthy operators at six Singaporean workplaces. NANOIMPACT 2021; 22:100325. [PMID: 35559961 DOI: 10.1016/j.impact.2021.100325] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 06/15/2023]
Abstract
Toner-based printing equipment (TPE), including laser printers and photocopiers, utilize several engineered nanomaterials (ENMs) to improve toner performance. Operation of TPE, which rarely employ any exposure controls, generates high exposures to nanoparticles that contain ENMs and complex organics. Epidemiological literature in copier operators documents respiratory effects, including nasal blockage, cough, excessive sputum, and breathing difficulties, cardiovascular effects, oxidative stress, and inflammation. However, epidemiological studies in humans with adequate exposure assessment and dose-response analysis are lacking. We present herein the analysis of the upper airway and systemic inflammation in plasma of 19 healthy copier operators at six Singapore workplaces. We employed a repeated panel design (four biomarker measurements over two weeks) combined with a multi-marker approach (14 inflammatory cytokines in plasma and nasal lavage (NL)), and comprehensive exposure assessment using four distinct exposure metrics. We investigated spatial and temporal patterns of markers of upper airway and systemic inflammation and their association with various exposure metrics. Several inflammatory markers, namely fractalkine, IL-1β, and IL-1α in NL, and fractalkine, IL-1β, TNF-α, and IFN-γ in plasma, were strongly and positively associated with at least one exposure metric, whereas GM-CSF was negatively associated. The inflammation score was also strongly associated with TPE nanoparticle exposures. Exposure to TPE emissions induced moderate upper airway inflammation and stronger systemic inflammation in these healthy operators, characterized by upregulation of at least IL-1β, fractalkine, TNF-α and IFN-γ. Proinflammatory cytokines TNF-α, IFN-γ and IL-1β play an important role in orchestrating inflammatory responses in various clinical conditions, including cardiovascular and autoimmune disease, and likely trigger activation of endothelial cells, leading to overexpression of fractalkine, a chemokine that is involved in and associated with multiple disorders, including atherosclerosis and vascular disease. Future larger-scale epidemiological studies in these workers and consumers exposed chronically to TPE nanoparticle emissions and proactive interventions to reduce or eliminate TPE exposures are recommended.
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Affiliation(s)
- Dhimiter Bello
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Bldg 1, Rm 1310B, Boston, MA 02115, USA; Department of Biomedical and Nutritional Sciences, Zuckerberg College of Health Sciences, University of Massachusetts Lowell, 883 Broadway Street, Dugan 108-C, Lowell, MA 01854, USA.
| | - Lucia Chanetsa
- Department of Biomedical and Nutritional Sciences, Zuckerberg College of Health Sciences, University of Massachusetts Lowell, 883 Broadway Street, Dugan 108-C, Lowell, MA 01854, USA
| | - Costas A Cristophi
- Cyprus International Institute for Environmental and Public Health, Cyprus University of Technology, 30 Arch. Kyprianos Str. 3036 Limassol, Cyprus
| | - Tuang Yeow Poh
- Lee Kong Chian School of Medicine, Nanyang Technological University, 11 Mandalay Road, 308232, Singapore
| | - Dilpreet Singh
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Bldg 1, Rm 1310B, Boston, MA 02115, USA
| | - Magdiel Inggrid Setyawati
- School of Materials Science and Engineering, Nanyang Technological University, N4.1, #01-21, 50 Nanyang Avenue, 639798, Singapore
| | - David Christiani
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Bldg 1, Rm 1310B, Boston, MA 02115, USA
| | - Sanjay H Chotirmall
- Lee Kong Chian School of Medicine, Nanyang Technological University, 11 Mandalay Road, 308232, Singapore
| | - Kee Woei Ng
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Bldg 1, Rm 1310B, Boston, MA 02115, USA; School of Materials Science and Engineering, Nanyang Technological University, N4.1, #01-21, 50 Nanyang Avenue, 639798, Singapore; Environmental Chemistry and Materials Centre, Nanyang Environment and Water Research Institution, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, 637141, Singapore
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Bldg 1, Rm 1310B, Boston, MA 02115, USA; School of Materials Science and Engineering, Nanyang Technological University, N4.1, #01-21, 50 Nanyang Avenue, 639798, Singapore.
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8
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Dominguez-Rodriguez A, Rodríguez S, Baez-Ferrer N, Abreu-Gonzalez P, Abreu-Gonzalez J, Avanzas P, Carnero M, Moris C, López-Darias J, Hernández-Vaquero D. Impact of Saharan dust exposure on airway inflammation in patients with ischemic heart disease. Transl Res 2020; 224:16-25. [PMID: 32504824 DOI: 10.1016/j.trsl.2020.05.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/26/2020] [Accepted: 05/27/2020] [Indexed: 12/31/2022]
Abstract
Epidemiological studies found that increases in the concentrations of airborne particulate matter (PM) smaller than 10 microns diameter (PM10) in the ambient air due to desert dust outbreaks contribute to global burden of diseases, primarily as a result of increased risk of cardiovascular morbidity and mortality. No studies have investigated the possible association between desert dust inhalation and airway inflammation in patients with ischemic heart disease (IHD). Induced sputum was collected in 38 patients and analyzed to determine markers of airway inflammation (Transforming Growth Factor-β1 [TGF-β1] and hydroxyproline) concentrations. For the purpose of the investigation, PM10 and reactive gases concentrations measured in the European Air Quality Network implemented in the Canary Islands were also used. We identified Saharan desert dust using meteorology and dust models. Patients affected by smoking, chronic obstructive pulmonary disease (COPD), asthma, pulmonary abnormalities, acute bronchial or pulmonary disease were excluded. The median of age of patients was 64.71 years (56.35-71.54) and 14 (38.84%) of them were women. TGF-β1 and hydroxyproline in sputum were highly associated to PM10 inhalation from the Saharan desert. According to a regression model, an increase of 1 µg/m3 of PM10 concentrations due to desert dust, results in an increase of 3.84 pg/gwt of TGF-β1 (R2 adjusted = 89.69%) and of 0.80 μg/gwt of hydroxyproline (R2 adjusted = 85.28%) in the sputum of patients. The results of this study indicate that the exposure to high PM10 concentrations due to Saharan dust events are associated with intense inflammatory reaction in the airway mucosae of IHD-patients.
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Affiliation(s)
- Alberto Dominguez-Rodriguez
- Hospital Universitario de Canarias, Department of Cardiology, Tenerife, Spain; Facultad de Ciencias de la Salud, Universidad Europea de Canarias, Tenerife, Spain; CIBER de enfermedades CardioVasculares (CIBERCV), Madrid, Spain
| | - Sergio Rodríguez
- Experimental Station of Arid Zones, EEZA, CSIC, Almería, Spain; Institute of Natural Products and Agrobiology, IPNA, CSIC, Tenerife, Spain.
| | - Nestor Baez-Ferrer
- Hospital Universitario de Canarias, Department of Cardiology, Tenerife, Spain
| | - Pedro Abreu-Gonzalez
- Department of Physiology, Faculty of Medicine, University of La Laguna, Tenerife, Spain
| | - Juan Abreu-Gonzalez
- Hospital Universitario de Canarias, Department of Pneumology, Tenerife, Spain
| | - Pablo Avanzas
- Heart Area. Hospital Universitario Central de Asturias, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias, Oviedo, Spain; Departamento de Medicina, Universidad de Oviedo, Oviedo, Asturias
| | | | - Cesar Moris
- Heart Area. Hospital Universitario Central de Asturias, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias, Oviedo, Spain; Departamento de Medicina, Universidad de Oviedo, Oviedo, Asturias
| | - Jessica López-Darias
- Institute of Natural Products and Agrobiology, IPNA, CSIC, Tenerife, Spain; Departamento de Química, University of La Laguna, Tenerife, Spain
| | - Daniel Hernández-Vaquero
- Heart Area. Hospital Universitario Central de Asturias, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias, Oviedo, Spain
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9
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Zou C, Yang H, Cui L, Cao X, Huang H, Chen T. Potential hazardous effects of printing room PM2.5 exposure include promotion of lung inflammation and subsequent injury. Mol Med Rep 2020; 22:3213-3224. [PMID: 32945461 PMCID: PMC7453667 DOI: 10.3892/mmr.2020.11399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Accepted: 06/26/2020] [Indexed: 11/09/2022] Open
Abstract
There have been few studies investigating the potential effects of indoor sources of particulate matter on human health. In this study, the effect of different concentrations of fine particulate matter (PM2.5) collected from a printing room on lung health was examined using cultured cells and a mouse model. Further, the mechanism of lung injury was examined. The results indicated that PM2.5 significantly enhanced malondialdehyde activity (P<0.05), decreased superoxide dismutase activity (P<0.05), upregulated the expression of pro-inflammatory factors including interleukin (IL)-1β, tumor necrosis factor-, IL-6 and downregulated the expression of the inflammatory factor IL-2 (P<0.05). Western blot analysis indicated that PM2.5 significantly enhanced expression of phosphorylated (p)-ERK relative to total ERK, cyclooxygenase-2, p-anti-nuclear-factor-κB (p-NF-κB) relative to NF-κB, transforming growth factor-β1 and Bax relative to Bcl-2 in inflammation (P<0.05), fibrosis and apoptosis signaling pathways. Furthermore, the results revealed that exposure was associated with an increased abundance of pathogens including Burkholderiales, Coriobacteriia, and Betaproteobacteria in in the lungs. In conclusion, exposure to PM2.5 from a printing room significantly increased inflammation, fibrosis, apoptosis and the abundance of pathogenic bacteria, indicating that exposure is potential threat to individuals who spend a significant amount of time in printing rooms.
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Affiliation(s)
- Changwei Zou
- School of Resources Environmental and Chemical Engineering, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, Jiangxi 330031, P.R. China
| | - Hong Yang
- School of Resources Environmental and Chemical Engineering, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, Jiangxi 330031, P.R. China
| | - Lanyue Cui
- Nanchang University Queen Mary School, Nanchang, Jiangxi 330031, P.R. China
| | - Xinyi Cao
- Nanchang University Queen Mary School, Nanchang, Jiangxi 330031, P.R. China
| | - Hong Huang
- School of Resources Environmental and Chemical Engineering, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, Jiangxi 330031, P.R. China
| | - Tingtao Chen
- National Engineering Research Center for Bioengineering Drugs and The Technologies, Institute of Translational Medicine, Nanchang University, Nanchang, Jiangxi 330031, P.R. China
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10
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Guo NL, Bello D, Ye Q, Tagett R, Chanetsa L, Singh D, Poh TY, Setyawati MI, Chotirmall SH, Ng KW, Demokritou P. Pilot deep RNA sequencing of worker blood samples from Singapore printing industry for occupational risk assessment. NANOIMPACT 2020; 19:100248. [PMID: 33511305 PMCID: PMC7840153 DOI: 10.1016/j.impact.2020.100248] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Several engineered nanomaterials (ENMs) are used in toner-based printing equipment (TPE) including laser printers and photocopiers to improve toner performance. High concentration of airborne nanoparticles due to TPE emissions has been documented in copy centers and chamber studies. Recent animal inhalation studies by our group suggested exposure to laser printer-emitted nanoparticles (PEPs) increased cardiovascular risk by impairing ventricular performance and inducing hypertension and arrhythmia, consistent with global transcriptomic and metabolomic profiling results. There has been no genome-wide transcriptomic analysis of workers exposed to TPE emissions to systematically assess the occupational exposure health risks. In this pilot study, deep RNA sequencing of blood samples of workers in two printing companies in Singapore was performed. The genome-scale analysis of the blood samples from TPE exposed workers revealed perturbed transcriptional activities related to inflammatory and immune responses, metabolism, cardiovascular impairment, neurological diseases, oxidative stress, physical morphogenesis/deformation, and cancer, when compared with the control peers (office workers). Many of these disease risks associated with particle inhalation exposures in such work environments were consistent with the observation from the PEPs rat inhalation studies. In particular, the cell adhesion molecules (CAMs) was a top significantly perturbed pathway in blood samples from exposed workers compared with the office workers in both companies. The protein expression of sICAM was verified in plasma of exposed workers, showing a positive correlation with daily average nanoparticle concentration in indoor air measured in these two companies. Larger scale genomic and molecular epidemiology studies in copier operators are warranted in order to assess potential risks from such particulate matter exposures.
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Affiliation(s)
- Nancy Lan Guo
- West Virginia University Cancer Institute/School of Public Health, West Virginia University, Morgantown, WV 26506
- Correspondence: ; Tel: 1-304-293-6455
| | - Dhimiter Bello
- Department of Biomedical and Nutritional Sciences, Zuckerberg College of Health Sciences, University of Massachusetts, Lowell, MA 01854
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, Boston, MA 02115, USA
| | - Qing Ye
- Lane Department of Computer Science and Electrical Engineering, Statler College of Engineering and Mineral Resources, West Virginia University, Morgantown, WV 26506
| | - Rebecca Tagett
- BRCF Bioinformatics Core, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Lucia Chanetsa
- Department of Biomedical and Nutritional Sciences, Zuckerberg College of Health Sciences, University of Massachusetts, Lowell, MA 01854
| | - Dilpreet Singh
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, Boston, MA 02115, USA
| | - Tuang Yeow Poh
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore
| | - Magdiel Inggrid Setyawati
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Sanjay H. Chotirmall
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore
| | - Kee Woei Ng
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, Boston, MA 02115, USA
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
- Environmental Chemistry and Materials Center, Nanyang Environment & Water Research Institute, Singapore 637141, Singapore
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, Boston, MA 02115, USA
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
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11
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Gu J, Karrasch S, Salthammer T. Review of the characteristics and possible health effects of particles emitted from laser printing devices. INDOOR AIR 2020; 30:396-421. [PMID: 31944398 DOI: 10.1111/ina.12646] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 12/18/2019] [Accepted: 01/09/2020] [Indexed: 06/10/2023]
Abstract
Many studies have shown that the use of laser printing devices (LPDs) contributes to the release of particles into the indoor environment. However, after more than two decades of research, the physicochemical properties of LPD-emitted particles and the possible health effects from exposure to particles are still heavily debated. We therefore carried out a critical review of the published studies around emissions and health effects of LPD-emitted particles, aiming at elucidating the nature of these particles and their potential health risks. Realizing the varying methodologies of the studies, a classification of the reviewed studies is adopted, resulting in three categories of emission studies (chamber experiment, office/room measurement, and photocopy shop measurement), and three types of health studies (in vitro/animal studies, human studies in the real world, and human studies in controlled settings). The strengths and limitations of each type of study are discussed in-depth, which in turn helps to understand the cause of divergent results. Overall, LPD-emitted particles are mainly condensed or secondary-formed semi-volatile organic compounds (SVOCs), while solid toner particles account for a very small fraction. The health risk from exposure to LPD-emitted particles is small compared with the health risk from exposure to ambient particles.
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Affiliation(s)
- Jianwei Gu
- Department of Material Analysis and Indoor Chemistry, Fraunhofer WKI, Braunschweig, Germany
| | - Stefan Karrasch
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
| | - Tunga Salthammer
- Department of Material Analysis and Indoor Chemistry, Fraunhofer WKI, Braunschweig, Germany
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12
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Wu Z, Shi P, Lim HK, Ma Y, Setyawati MI, Bitounis D, Demokritou P, Ng KW, Tay CY. Inflammation Increases Susceptibility of Human Small Airway Epithelial Cells to Pneumonic Nanotoxicity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2000963. [PMID: 32338442 PMCID: PMC8074924 DOI: 10.1002/smll.202000963] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 03/20/2020] [Accepted: 03/23/2020] [Indexed: 05/04/2023]
Abstract
Exposure to inhaled anthropogenic nanomaterials (NM) with dimension <100 nm has been implicated in numerous adverse respiratory outcomes. Although studies have identified key NM physiochemical determinants of pneumonic nanotoxicity, the complex interactive and cumulative effects of NM exposure, especially in individuals with preexisting inflammatory respiratory diseases, remain unclear. Herein, the susceptibility of primary human small airway epithelial cells (SAEC) exposed to a panel of reference NM, namely, CuO, ZnO, mild steel welding fume (MSWF), and nanofractions of copier center particles (Nano-CCP), is examined in normal and tumor necrosis factor alpha (TNF-α)-induced inflamed SAEC. Compared to normal SAEC, inflamed cells display an increased susceptibility to NM-induced cytotoxicity by 15-70% due to a higher basal level of intracellular reactive oxygen species (ROS). Among the NM screened, ZnO, CuO, and Nano-CCP are observed to trigger an overcompensatory response in normal SAEC, resulting in an increased tolerance against subsequent oxidative insults. However, the inflamed SAEC fails to adapt to the NM exposure due to an impaired nuclear factor erythroid 2-related factor 2 (Nrf2)-mediated cytoprotective response. The findings reveal that susceptibility to pulmonary nanotoxicity is highly dependent on the interplay between NM properties and inflammation of the alveolar milieu.
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Affiliation(s)
- Zhuoran Wu
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Pujiang Shi
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Hong Kit Lim
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Yiyuan Ma
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Magdiel Inggrid Setyawati
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Dimitrios Bitounis
- Department of Environmental Health, School of Public Health, Harvard University, 665 Huntington Avenue, Boston, MA 02115, USA
| | - Philip Demokritou
- Department of Environmental Health, School of Public Health, Harvard University, 665 Huntington Avenue, Boston, MA 02115, USA
| | - Kee Woei Ng
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
- Department of Environmental Health, School of Public Health, Harvard University, 665 Huntington Avenue, Boston, MA 02115, USA
- Environmental Chemistry and Materials Centre, Nanyang Environment & Water Research Institute, 1 Cleantech Loop, CleanTech One, Singapore, 637141, Singapore
- Skin Research Institute of Singapore, 8A Biomedical Grove, Singapore, 138648, Singapore
| | - Chor Yong Tay
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
- Environmental Chemistry and Materials Centre, Nanyang Environment & Water Research Institute, 1 Cleantech Loop, CleanTech One, Singapore, 637141, Singapore
- School of Biological Sciences, Nanyang Technological University, Singapore, 637551, Singapore
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13
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Setyawati MI, Singh D, Krishnan SPR, Huang X, Wang M, Jia S, Goh BHR, Ho CG, Yusoff R, Kathawala MH, Poh TY, Ali NABM, Chotirmall SH, Aitken RJ, Riediker M, Christiani DC, Fang M, Bello D, Demokritou P, Ng KW. Occupational Inhalation Exposures to Nanoparticles at Six Singapore Printing Centers. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:2389-2400. [PMID: 31967798 DOI: 10.1021/acs.est.9b06984] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Laser printers emit high levels of nanoparticles (PM0.1) during operation. Although it is well established that toners contain multiple engineered nanomaterials (ENMs), little is known about inhalation exposures to these nanoparticles and work practices in printing centers. In this report, we present a comprehensive inhalation exposure assessment of indoor microenvironments at six commercial printing centers in Singapore, the first such assessment outside of the United States, using real-time personal and stationary monitors, time-integrated instrumentation, and multiple analytical methods. Extensive presence of ENMs, including titanium dioxide, iron oxide, and silica, was detected in toners and in airborne particles collected from all six centers studied. We document high transient exposures to emitted nanoparticles (peaks of ∼500 000 particles/cm3, lung-deposited surface area of up to 220 μm2/cm3, and PM0.1 up to 16 μg/m3) with complex PM0.1 chemistry that included 40-60 wt % organic carbon, 10-15 wt % elemental carbon, and 14 wt % trace elements. We also record 271.6-474.9 pmol/mg of Environmental Protection Agency-priority polycyclic aromatic hydrocarbons. These findings highlight the potentially high occupational inhalation exposures to nanoparticles with complex compositions resulting from widespread usage of nano-enabled toners in the printing industry, as well as inadequate ENM-specific exposure control measures in these settings.
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Affiliation(s)
- Magdiel I Setyawati
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
| | - Dilpreet Singh
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health , Harvard University , 665 Huntington Avenue , Boston , Massachusetts 02115 , United States
| | - Sriram P R Krishnan
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
- IOM Singapore , 237 Alexandra Road , 159929 , Singapore
| | - Xian Huang
- IOM Singapore , 237 Alexandra Road , 159929 , Singapore
| | - Mengjing Wang
- School of Civil and Environmental Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
| | - Shenglan Jia
- School of Civil and Environmental Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
| | - Bernice Huan Rong Goh
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
| | - Chin Guan Ho
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
| | - Ridhwan Yusoff
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
| | - Mustafa H Kathawala
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
| | - Tuang Yeow Poh
- Lee Kong Chian School of Medicine , Nanyang Technological University , 11 Mandalay Road , 308232 , Singapore
| | | | - Sanjay H Chotirmall
- Lee Kong Chian School of Medicine , Nanyang Technological University , 11 Mandalay Road , 308232 , Singapore
| | | | - Michael Riediker
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
- IOM Singapore , 237 Alexandra Road , 159929 , Singapore
| | - David C Christiani
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health , Harvard University , 665 Huntington Avenue , Boston , Massachusetts 02115 , United States
| | - Mingliang Fang
- School of Civil and Environmental Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
| | - Dhimiter Bello
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health , Harvard University , 665 Huntington Avenue , Boston , Massachusetts 02115 , United States
| | - Philip Demokritou
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health , Harvard University , 665 Huntington Avenue , Boston , Massachusetts 02115 , United States
| | - Kee Woei Ng
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
- Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health , Harvard University , 665 Huntington Avenue , Boston , Massachusetts 02115 , United States
- Skin Research Institute of Singapore , Biomedical Science Institutes , Immunos, 8A Biomedical Grove , 138648 , Singapore
- Environmental Chemistry & Materials Centre, Nanyang Environment and Water Research Institute (NEWRI), Nanyang Technological University , 1 Cleantech Loop, CleanTech One , 637141 , Singapore
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14
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Hadrup N, Saber AT, Kyjovska ZO, Jacobsen NR, Vippola M, Sarlin E, Ding Y, Schmid O, Wallin H, Jensen KA, Vogel U. Pulmonary toxicity of Fe 2O 3, ZnFe 2O 4, NiFe 2O 4 and NiZnFe 4O 8 nanomaterials: Inflammation and DNA strand breaks. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2020; 74:103303. [PMID: 31794919 DOI: 10.1016/j.etap.2019.103303] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 11/19/2019] [Accepted: 11/20/2019] [Indexed: 06/10/2023]
Abstract
Exposure to metal oxide nanomaterials potentially occurs at the workplace. We investigated the toxicity of two Fe-oxides: Fe2O3 nanoparticles and nanorods; and three MFe2O4 spinels: NiZnFe4O8, ZnFe2O4, and NiFe2O4 nanoparticles. Mice were dosed 14, 43 or 128 μg by intratracheal instillation. Recovery periods were 1, 3, or 28 days. Inflammation - neutrophil influx into bronchoalveolar lavage (BAL) fluid - occurred for Fe2O3 rods (1 day), ZnFe2O4 (1, 3 days), NiFe2O4 (1, 3, 28 days), Fe2O3 (28 days) and NiZnFe4O8 (28 days). Conversion of mass-dose into specific surface-area-dose showed that inflammation correlated with deposited surface area and consequently, all these nanomaterials belong to the so-called low-solubility, low-toxicity class. Increased levels of DNA strand breaks were observed for both Fe2O3 particles and rods, in BAL cells three days post-exposure. To our knowledge, this is, besides magnetite (Fe3O4), the first study of the pulmonary toxicity of MFe2O4 spinel nanomaterials.
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Affiliation(s)
- Niels Hadrup
- National Research Centre for the Working Environment (NFA), 105 Lersø Parkallé, Copenhagen Ø, Denmark.
| | - Anne T Saber
- National Research Centre for the Working Environment (NFA), 105 Lersø Parkallé, Copenhagen Ø, Denmark.
| | - Zdenka O Kyjovska
- National Research Centre for the Working Environment (NFA), 105 Lersø Parkallé, Copenhagen Ø, Denmark.
| | - Nicklas R Jacobsen
- National Research Centre for the Working Environment (NFA), 105 Lersø Parkallé, Copenhagen Ø, Denmark.
| | - Minnamari Vippola
- Materials Science and Environmental Engineering, Tampere University, P.O.Box 589, 33014 Tampere University, Finland.
| | - Essi Sarlin
- Materials Science and Environmental Engineering, Tampere University, P.O.Box 589, 33014 Tampere University, Finland.
| | - Yaobo Ding
- Comprehensive Pneumology Center, Member of the German Center for Lung Research, Max-Lebsche-Platz 31, 81377 Munich, Germany; Institute of Lung Biology and Disease, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstädter Landstraße 1, 85764, Neuherberg, Germany.
| | - Otmar Schmid
- Comprehensive Pneumology Center, Member of the German Center for Lung Research, Max-Lebsche-Platz 31, 81377 Munich, Germany; Institute of Lung Biology and Disease, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstädter Landstraße 1, 85764, Neuherberg, Germany.
| | - Håkan Wallin
- National Institute of Occupational Health, Oslo, Norway.
| | - Keld A Jensen
- National Research Centre for the Working Environment (NFA), 105 Lersø Parkallé, Copenhagen Ø, Denmark.
| | - Ulla Vogel
- National Research Centre for the Working Environment (NFA), 105 Lersø Parkallé, Copenhagen Ø, Denmark; Department of Health Technology, Danish Technical University (DTU), DK-2800 Kgs. Lyngby, Denmark.
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15
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Examining the in vivo pulmonary toxicity of engineered metal oxide nanomaterials using a genetic algorithm-based dose-response-recovery clustering model. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/j.comtox.2019.100113] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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Carll AP, Salatini R, Pirela SV, Wang Y, Xie Z, Lorkiewicz P, Naeem N, Qian Y, Castranova V, Godleski JJ, Demokritou P. Inhalation of printer-emitted particles impairs cardiac conduction, hemodynamics, and autonomic regulation and induces arrhythmia and electrical remodeling in rats. Part Fibre Toxicol 2020; 17:7. [PMID: 31996220 PMCID: PMC6990551 DOI: 10.1186/s12989-019-0335-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 12/29/2019] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Using engineered nanomaterial-based toners, laser printers generate aerosols with alarming levels of nanoparticles that bear high bioactivity and potential health risks. Yet, the cardiac impacts of printer-emitted particles (PEPs) are unknown. Inhalation of particulate matter (PM) promotes cardiovascular morbidity and mortality, and ultra-fine particulates (< 0.1 μm aerodynamic diameter) may bear toxicity unique from larger particles. Toxicological studies suggest that PM impairs left ventricular (LV) performance; however, such investigations have heretofore required animal restraint, anesthesia, or ex vivo preparations that can confound physiologic endpoints and/or prohibit LV mechanical assessments during exposure. To assess the acute and chronic effects of PEPs on cardiac physiology, male Sprague Dawley rats were exposed to PEPs (21 days, 5 h/day) while monitoring LV pressure (LVP) and electrocardiogram (ECG) via conscious telemetry, analyzing LVP and heart rate variability (HRV) in four-day increments from exposure days 1 to 21, as well as ECG and baroreflex sensitivity. At 2, 35, and 70 days after PEPs exposure ceased, rats received stress tests. RESULTS On day 21 of exposure, PEPs significantly (P < 0.05 vs. Air) increased LV end systolic pressure (LVESP, + 18 mmHg) and rate-pressure-product (+ 19%), and decreased HRV indicating sympathetic dominance (root means squared of successive differences [RMSSD], - 21%). Overall, PEPs decreased LV ejection time (- 9%), relaxation time (- 3%), tau (- 5%), RMSSD (- 21%), and P-wave duration (- 9%). PEPs increased QTc interval (+ 5%) and low:high frequency HRV (+ 24%; all P < 0.05 vs. Air), while tending to decrease baroreflex sensitivity and contractility index (- 15% and - 3%, P < 0.10 vs. Air). Relative to Air, at both 2 and 35 days after PEPs, ventricular arrhythmias increased, and at 70 days post-exposure LVESP increased. PEPs impaired ventricular repolarization at 2 and 35 days post-exposure, but only during stress tests. At 72 days post-exposure, PEPs increased urinary dopamine 5-fold and protein expression of ventricular repolarizing channels, Kv1.5, Kv4.2, and Kv7.1, by 50%. CONCLUSIONS Our findings suggest exposure to PEPs increases cardiovascular risk by augmenting sympathetic influence, impairing ventricular performance and repolarization, and inducing hypertension and arrhythmia. PEPs may present significant health risks through adverse cardiovascular effects, especially in occupational settings, among susceptible individuals, and with long-term exposure.
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Affiliation(s)
- Alex P. Carll
- Department of Physiology, School of Medicine, University of Louisville, Louisville, KY USA
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY USA
- Center for Nanotechnology and Nanotoxicology. Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 665 Huntington Avenue, Room 1310, Boston, MA 02115 USA
| | - Renata Salatini
- Department of Physiology, School of Medicine, University of Louisville, Louisville, KY USA
- Department of Surgery, University of Sao Paulo Medical School, Sao Paulo, Brazil
| | - Sandra V. Pirela
- Center for Nanotechnology and Nanotoxicology. Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 665 Huntington Avenue, Room 1310, Boston, MA 02115 USA
| | - Yun Wang
- Center for Nanotechnology and Nanotoxicology. Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 665 Huntington Avenue, Room 1310, Boston, MA 02115 USA
- Department of Occupational and Environmental Health Sciences,School of Public Health, Peking University, Beijing, People’s Republic of China
| | - Zhengzhi Xie
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY USA
| | - Pawel Lorkiewicz
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY USA
| | - Nazratan Naeem
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY USA
| | - Yong Qian
- Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV USA
| | - Vincent Castranova
- Department of Pharmaceutical Sciences/Mary Babb Randolph Cancer Center, West Virginia University, Morgantown, WV USA
| | - John J. Godleski
- Center for Nanotechnology and Nanotoxicology. Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 665 Huntington Avenue, Room 1310, Boston, MA 02115 USA
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology. Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, 665 Huntington Avenue, Room 1310, Boston, MA 02115 USA
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17
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Tomonaga T, Izumi H, Yoshiura Y, Marui T, Wang K, Nishida C, Yatera K, Morimoto Y. Long-term observation of pulmonary toxicity of toner with external additives following a single intratracheal instillation in rats. J Occup Health 2020; 62:e12146. [PMID: 32710690 PMCID: PMC7382305 DOI: 10.1002/1348-9585.12146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 05/11/2020] [Accepted: 06/17/2020] [Indexed: 11/11/2022] Open
Abstract
OBJECTIVES Along with technological innovations for improving the efficiency of printing, nanoparticles have been added to the surface of toners, and there is concern about the harmful effects of those components. We investigated, through a long-term observation following intratracheal instillation using rats, whether exposure to a toner with external additives can cause tumorigenesis. METHODS Female Wistar rats were intratracheally instilled with dispersed toner at low (1 mg/rat) and high (2 mg/rat) doses, and the rats were sacrificed at 24 months after exposure, after which we examined pulmonary inflammation, histopathological changes, and DNA damage in the lung. Rats that had deceased before 24 months were dissected at that time as well, to compare tumor development. RESULTS Although alveolar macrophages with pigment deposition in the alveoli were observed in the 1 and 2 mg exposure groups, no significant lung inflammation/fibrosis or tumor was observed. Since immunostaining with 8-OHdG or γ-H2AX did not show a remarkable positive reaction, it is thought that toner did not cause severe DNA damage to lung tissue. CONCLUSION These results suggest that toner with external additives may have low toxicity in the lung.
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Affiliation(s)
- Taisuke Tomonaga
- Department of Occupational PneumologyInstitute of Industrial Ecological SciencesUniversity of Occupational and Environmental HealthKitakyushuFukuokaJapan
| | - Hiroto Izumi
- Department of Occupational PneumologyInstitute of Industrial Ecological SciencesUniversity of Occupational and Environmental HealthKitakyushuFukuokaJapan
| | - Yukiko Yoshiura
- Department of Occupational PneumologyInstitute of Industrial Ecological SciencesUniversity of Occupational and Environmental HealthKitakyushuFukuokaJapan
| | - Takashi Marui
- Department of Occupational PneumologyInstitute of Industrial Ecological SciencesUniversity of Occupational and Environmental HealthKitakyushuFukuokaJapan
| | - Ke‐Yong Wang
- Shared‐Use Research CenterSchool of MedicineUniversity of Occupational and Environmental HealthKitakyushuFukuokaJapan
| | - Chinatsu Nishida
- Department of Respiratory MedicineUniversity of Occupational and Environmental HealthKitakyushuFukuokaJapan
| | - Kazuhiro Yatera
- Department of Respiratory MedicineUniversity of Occupational and Environmental HealthKitakyushuFukuokaJapan
| | - Yasuo Morimoto
- Department of Occupational PneumologyInstitute of Industrial Ecological SciencesUniversity of Occupational and Environmental HealthKitakyushuFukuokaJapan
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18
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Guo NL, Poh TY, Pirela S, Farcas MT, Chotirmall SH, Tham WK, Adav SS, Ye Q, Wei Y, Shen S, Christiani DC, Ng KW, Thomas T, Qian Y, Demokritou P. Integrated Transcriptomics, Metabolomics, and Lipidomics Profiling in Rat Lung, Blood, and Serum for Assessment of Laser Printer-Emitted Nanoparticle Inhalation Exposure-Induced Disease Risks. Int J Mol Sci 2019; 20:E6348. [PMID: 31888290 PMCID: PMC6940784 DOI: 10.3390/ijms20246348] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 12/12/2019] [Accepted: 12/13/2019] [Indexed: 12/13/2022] Open
Abstract
Laser printer-emitted nanoparticles (PEPs) generated from toners during printing represent one of the most common types of life cycle released particulate matter from nano-enabled products. Toxicological assessment of PEPs is therefore important for occupational and consumer health protection. Our group recently reported exposure to PEPs induces adverse cardiovascular responses including hypertension and arrythmia via monitoring left ventricular pressure and electrocardiogram in rats. This study employed genome-wide mRNA and miRNA profiling in rat lung and blood integrated with metabolomics and lipidomics profiling in rat serum to identify biomarkers for assessing PEPs-induced disease risks. Whole-body inhalation of PEPs perturbed transcriptional activities associated with cardiovascular dysfunction, metabolic syndrome, and neural disorders at every observed time point in both rat lung and blood during the 21 days of exposure. Furthermore, the systematic analysis revealed PEPs-induced transcriptomic changes linking to other disease risks in rats, including diabetes, congenital defects, auto-recessive disorders, physical deformation, and carcinogenesis. The results were also confirmed with global metabolomics profiling in rat serum. Among the validated metabolites and lipids, linoleic acid, arachidonic acid, docosahexanoic acid, and histidine showed significant variation in PEPs-exposed rat serum. Overall, the identified PEPs-induced dysregulated genes, molecular pathways and functions, and miRNA-mediated transcriptional activities provide important insights into the disease mechanisms. The discovered important mRNAs, miRNAs, lipids and metabolites may serve as candidate biomarkers for future occupational and medical surveillance studies. To the best of our knowledge, this is the first study systematically integrating in vivo, transcriptomics, metabolomics, and lipidomics to assess PEPs inhalation exposure-induced disease risks using a rat model.
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Affiliation(s)
- Nancy Lan Guo
- West Virginia University Cancer Institute/School of Public Health, West Virginia University, Morgantown, WV 26506, USA;
| | - Tuang Yeow Poh
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore; (T.Y.P.); (S.H.C.); (S.S.); (D.C.C.)
| | - Sandra Pirela
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T. H. Chan School of Public Health, Harvard University, Boston, MA 02115, USA; (S.P.); (K.W.N.); (P.D.)
| | - Mariana T. Farcas
- Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA; (M.T.F.); (Y.Q.)
| | - Sanjay H. Chotirmall
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore; (T.Y.P.); (S.H.C.); (S.S.); (D.C.C.)
| | - Wai Kin Tham
- Singapore Phenome Centre, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 636921, Singapore; (W.K.T.); (S.S.A.)
| | - Sunil S. Adav
- Singapore Phenome Centre, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 636921, Singapore; (W.K.T.); (S.S.A.)
| | - Qing Ye
- West Virginia University Cancer Institute/School of Public Health, West Virginia University, Morgantown, WV 26506, USA;
| | - Yongyue Wei
- Key Lab for Modern Toxicology, Department of Epidemiology and Biostatistics and Ministry of Education (MOE), School of Public Health, Nanjing Medical University, Nanjing 210029, China;
| | - Sipeng Shen
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore; (T.Y.P.); (S.H.C.); (S.S.); (D.C.C.)
| | - David C. Christiani
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore; (T.Y.P.); (S.H.C.); (S.S.); (D.C.C.)
| | - Kee Woei Ng
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T. H. Chan School of Public Health, Harvard University, Boston, MA 02115, USA; (S.P.); (K.W.N.); (P.D.)
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
- Environmental Chemistry and Materials Centre, Nanyang Environment & Water Research Institute, Singapore 637141, Singapore
| | - Treye Thomas
- Office of Hazard Identification and Reduction, U.S. Consumer Product Safety Commission, Rockville, MD 20814, USA;
| | - Yong Qian
- Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA; (M.T.F.); (Y.Q.)
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, T. H. Chan School of Public Health, Harvard University, Boston, MA 02115, USA; (S.P.); (K.W.N.); (P.D.)
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Yang J, Chen Y, Yu Z, Ding H, Ma Z. The influence of PM 2.5 on lung injury and cytokines in mice. Exp Ther Med 2019; 18:2503-2511. [PMID: 31572502 PMCID: PMC6755482 DOI: 10.3892/etm.2019.7839] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Accepted: 01/18/2019] [Indexed: 12/14/2022] Open
Abstract
Exposure to particulate matter ≤2.5 µm in diameter (PM2.5) profoundly affects human health. However, the role of PM2.5 on lung injury and cytokine levels in mice is currently unknown. The aim was to examine the effect of PM2.5 pollution on lung injury in mice fed at an underground parking lot. A total of 20 female Kunming mice were randomly divided into control and polluted groups, with 10 rats in each group. The control group was kept in the laboratory, while the pollution group was fed in an underground parking lot. The concentrations of pollutants were measured using ambient air quality monitoring instruments. After 3 months of treatment, the lungs were collected and examined using electron microscopy, and the morphological structures were assessed using hematoxylin and eosin staining. The polarization of macrophages was evaluated by immunofluorescence. The concentration of interleukin (IL)-4, tumor necrosis factor (TNF)-α and transforming growth factor (TGF)-β1 in peripheral sera were assessed by ELISA. The mRNA and protein levels of IL-4, TNF-α, and TGF-β1 in lung tissues were assessed by reverse transcription-quantitative polymerase chain reaction and western blot analyses, respectively. In the polluted group, the levels of CO, NOx and PM2.5 were significantly higher compared with the control group. Compared with the controls, intracellular edema, an increased number of microvilli and lamellar bodies, smaller lamellar bodies in type II alveolar epithelial cells, and abundant particles induced by PM2.5 in macrophages were observed in the polluted group. The lung ultrastructure changed in the polluted group, revealing exhaust-induced lung injury: The tissues were damaged, and the number of inflammatory cells, neutrophils, polylymphocytes and eosinophils increased in the polluted group compared with the control group. The authors also observed that the number of M1 and M2 macrophages markedly increased after the exhaust treatment. The levels of IL-4, TNF-α and TGF-β1 in the sera and tissues were significantly increased in the polluted group. PM2.5 pollutants in underground garages can lead to lung injury and have a significant impact on the level of inflammatory cytokines in mice. Therefore, the authors suggest that PM2.5 can activate the inflammatory reaction and induce immune dysfunction, leading to ultrastructural damage.
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Affiliation(s)
- Jie Yang
- Department of Dermatology, Guangdong Academy of Medical Sciences (Guangdong General Hospital), Guangzhou, Guangdong 510080, P.R. China
| | - Yi Chen
- Department of General Internal Medicine, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Zhi Yu
- Research Center of Intelligent Transportation System, School of Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, P.R. China
| | - Hui Ding
- Research Center of Intelligent Transportation System, School of Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, P.R. China
| | - Zhongfu Ma
- Department of General Internal Medicine, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, P.R. China
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20
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Fazli T, Zeng Y, Stephens B. Fine and ultrafine particle removal efficiency of new residential HVAC filters. INDOOR AIR 2019; 29:656-669. [PMID: 31077624 DOI: 10.1111/ina.12566] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 04/17/2019] [Accepted: 05/07/2019] [Indexed: 06/09/2023]
Abstract
Particle air filters used in central residential forced-air systems are most commonly evaluated for their size-resolved removal efficiency for particles 0.3-10 µm using laboratory tests. Little information exists on the removal efficiency of commercially available residential filters for particles smaller than 0.3 µm or for integral measures of mass-based aerosol concentrations (eg, PM2.5 ) or total number concentrations (eg, ultrafine particles, or UFPs) that are commonly used in regulatory monitoring and building measurements. Here, we measure the size-resolved removal efficiency of 50 new commercially available residential HVAC filters installed in a recirculating central air-handling unit in an unoccupied apartment unit using alternating upstream/downstream measurements with incense and NaCl as particle sources. Size-resolved removal efficiencies are then used to estimate integral measures of PM2.5 and total UFP removal efficiency for the filters assuming they are challenged by 201 residential indoor particle size distributions (PSDs) gathered from the literature. Total UFP and PM2.5 removal efficiencies generally increased with manufacturer-reported filter ratings and with filter thickness, albeit with numerous exceptions. PM2.5 removal efficiencies were more influenced by the assumption for indoor PSD than total UFP removal efficiencies. Filters with the same ratings but from different manufacturers often had different removal efficiencies for PM2.5 and total UFPs.
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Affiliation(s)
- Torkan Fazli
- Department of Civil, Architectural, and Environmental Engineering, Illinois Institute of Technology, Chicago, Illinois
| | - Yicheng Zeng
- Department of Civil, Architectural, and Environmental Engineering, Illinois Institute of Technology, Chicago, Illinois
| | - Brent Stephens
- Department of Civil, Architectural, and Environmental Engineering, Illinois Institute of Technology, Chicago, Illinois
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21
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Nandan A, Siddiqui NA, Kumar P. Assessment of environmental and ergonomic hazard associated to printing and photocopying: a review. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2019; 41:1187-1211. [PMID: 30350125 DOI: 10.1007/s10653-018-0205-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 10/09/2018] [Indexed: 06/08/2023]
Abstract
"Knowledge is power" and distribution of knowledge is fueled by printing and photocopying industry. Even as printing and photocopying industry have revolutionized the availability of documents and perceptible image quickly at extremely inexpensive and affordable cost, the boon of its revolution has turned into a bane by irresponsible, uncontrolled and extensive use, causing irreversible degradation to not only ecosystem by continuous release of ozone and other volatile organic compounds (VOCs) but also the health of workers occupationally exposed to it. Indoor ozone level due to emission from different photocopying equipment's increases drastically and the condition of other air quality parameters are not different. This situation is particularly sedate in extremely sensitive educational and research industry where sharing of knowledge is extremely important to meet the demands. This work is an attempt to catalogue all the environmental as well as health impacts of printing or photocopying. It has been observed that printing/photocopying operation is a significant factor contributing to indoor air quality degradation, which includes increase in concentration of ozone, VOCs, semi-volatile organic compounds (SVOCs) and heavy metals such as cadmium, selenium, arsenic, zinc, nickel, and other pollutants from photocopy machines. The outcome of this study will empower the manufactures with information regarding ozone and other significant emission, so that their impact can be reduced.
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Affiliation(s)
- Abhishek Nandan
- University of Petroleum and Energy Studies, Dehradun, India.
| | - N A Siddiqui
- University of Petroleum and Energy Studies, Dehradun, India
| | - Pankaj Kumar
- University of Petroleum and Energy Studies, Dehradun, India
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22
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Putra M, Sharma S, Gage M, Gasser G, Hinojo-Perez A, Olson A, Gregory-Flores A, Puttachary S, Wang C, Anantharam V, Thippeswamy T. Inducible nitric oxide synthase inhibitor, 1400W, mitigates DFP-induced long-term neurotoxicity in the rat model. Neurobiol Dis 2019; 133:104443. [PMID: 30940499 DOI: 10.1016/j.nbd.2019.03.031] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 02/22/2019] [Accepted: 03/28/2019] [Indexed: 11/26/2022] Open
Abstract
Chemical nerve agents (CNA) are increasingly becoming a threat to both civilians and military personnel. CNA-induced acute effects on the nervous system have been known for some time and the long-term consequences are beginning to emerge. In this study, we used diisopropylfluorophosphate (DFP), a seizurogenic CNA to investigate the long-term impact of its acute exposure on the brain and its mitigation by an inducible nitric oxide synthase (iNOS) inhibitor, 1400W as a neuroprotectant in the rat model. Several experimental studies have demonstrated that DFP-induced seizures and/or status epilepticus (SE) causes permanent brain injury, even after the countermeasure medication (atropine, oxime, and diazepam). In the present study, DFP-induced SE caused a significant increase in iNOS and 3-nitrotyrosine (3-NT) at 24 h, 48 h, 7d, and persisted for a long-term (12 weeks post-exposure), which led to the hypothesis that iNOS is a potential therapeutic target in DFP-induced brain injury. To test the hypothesis, we administered 1400W (20 mg/kg, i.m.) or the vehicle twice daily for the first three days of post-exposure. 1400W significantly reduced DFP-induced iNOS and 3-NT upregulation in the hippocampus and piriform cortex, and the serum nitrite levels at 24 h post-exposure. 1400W also prevented DFP-induced mortality in <24 h. The brain immunohistochemistry (IHC) at 7d post-exposure revealed a significant reduction in gliosis and neurodegeneration (NeuN+ FJB positive cells) in the 1400W-treated group. 1400W, in contrast to the vehicle, caused a significant reduction in the epileptiform spiking and spontaneous recurrent seizures (SRS) during 12 weeks of continuous video-EEG study. IHC of brain sections from the same animals revealed a significant reduction in reactive gliosis (both microgliosis and astrogliosis) and neurodegeneration across various brain regions in the 1400W-treated group when compared to the vehicle-treated group. A multiplex assay from hippocampal lysates at 6 weeks post-exposure showed a significant increase in several key pro-inflammatory cytokines/chemokines such as IL-1α, TNFα, IL-1β, IL-2, IL-6, IL-12, IL-17a, MCP-1, LIX, and Eotaxin, and a growth factor, VEGF in the vehicle-treated animals. 1400W significantly suppressed IL-1α, TNFα, IL-2, IL-12, and MCP-1 levels. It also suppressed DFP-induced serum nitrite levels at 6 weeks post-exposure. In the Morris water maze, the vehicle-treated animals spent significantly less time in the target quadrant in a probe trial at 9d post-exposure compared to their time spent in the same quadrant 11 days previously (i.e., 2 days prior to DFP exposure). Such a difference was not observed in the 1400W and control groups. However, learning and short-term memory were unaffected when tested at 10-16d and 28-34d post-exposure. Accelerated rotarod, horizontal bar test, and the forced swim test revealed no significant changes between groups. Overall, the findings from this study suggest that 1400W may be considered as a potential therapeutic agent as a follow-on therapy for CNA exposure, after controlling the acute symptoms, to prevent mortality and some of the long-term neurotoxicity parameters such as epileptiform spiking, SRS, neurodegeneration, reactive gliosis in some brain regions, and certain key proinflammatory cytokines and chemokine.
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Affiliation(s)
- Marson Putra
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, United States
| | - Shaunik Sharma
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, United States
| | - Meghan Gage
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, United States
| | | | - Andy Hinojo-Perez
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, United States
| | - Ashley Olson
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, United States
| | - Adriana Gregory-Flores
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, United States
| | - Sreekanth Puttachary
- Department of Biomedical Sciences, Carlson College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, United States
| | - Chong Wang
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, United States
| | | | - Thimmasettappa Thippeswamy
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, United States.
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23
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Poh TY, Ali NABM, Mac Aogáin M, Kathawala MH, Setyawati MI, Ng KW, Chotirmall SH. Inhaled nanomaterials and the respiratory microbiome: clinical, immunological and toxicological perspectives. Part Fibre Toxicol 2018; 15:46. [PMID: 30458822 PMCID: PMC6245551 DOI: 10.1186/s12989-018-0282-0] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 10/31/2018] [Indexed: 12/17/2022] Open
Abstract
Our development and usage of engineered nanomaterials has grown exponentially despite concerns about their unfavourable cardiorespiratory consequence, one that parallels ambient ultrafine particle exposure from vehicle emissions. Most research in the field has so far focused on airway inflammation in response to nanoparticle inhalation, however, little is known about nanoparticle-microbiome interaction in the human airway and the environment. Emerging evidence illustrates that the airway, even in its healthy state, is not sterile. The resident human airway microbiome is further altered in chronic inflammatory respiratory disease however little is known about the impact of nanoparticle inhalation on this airway microbiome. The composition of the airway microbiome, which is involved in the development and progression of respiratory disease is dynamic, adding further complexity to understanding microbiota-host interaction in the lung, particularly in the context of nanoparticle exposure. This article reviews the size-dependent properties of nanomaterials, their body deposition after inhalation and factors that influence their fate. We evaluate what is currently known about nanoparticle-microbiome interactions in the human airway and summarise the known clinical, immunological and toxicological consequences of this relationship. While associations between inhaled ambient ultrafine particles and host immune-inflammatory response are known, the airway and environmental microbiomes likely act as intermediaries and facilitate individual susceptibility to inhaled nanoparticles and toxicants. Characterising the precise interaction between the environment and airway microbiomes, inhaled nanoparticles and the host immune system is therefore critical and will provide insight into mechanisms promoting nanoparticle induced airway damage.
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Affiliation(s)
- Tuang Yeow Poh
- Translational Respiratory Research Laboratory, Lee Kong Chian School of Medicine, Nanyang Technological University, Level 12, Clinical Sciences Building, 11 Mandalay Road, Singapore, 308232, Singapore
| | - Nur A'tikah Binte Mohamed Ali
- Translational Respiratory Research Laboratory, Lee Kong Chian School of Medicine, Nanyang Technological University, Level 12, Clinical Sciences Building, 11 Mandalay Road, Singapore, 308232, Singapore
| | - Micheál Mac Aogáin
- Translational Respiratory Research Laboratory, Lee Kong Chian School of Medicine, Nanyang Technological University, Level 12, Clinical Sciences Building, 11 Mandalay Road, Singapore, 308232, Singapore
| | - Mustafa Hussain Kathawala
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Magdiel Inggrid Setyawati
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Kee Woei Ng
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Sanjay Haresh Chotirmall
- Translational Respiratory Research Laboratory, Lee Kong Chian School of Medicine, Nanyang Technological University, Level 12, Clinical Sciences Building, 11 Mandalay Road, Singapore, 308232, Singapore.
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24
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Deng J, Dong F, Dai Q, Huo T, Ma J, Zhang X, Yang J. Interface effect of natural precipitated dust on the normal flora of Escherichia coli and Staphylococcus epidermidis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:22340-22347. [PMID: 28721612 DOI: 10.1007/s11356-017-9666-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 06/27/2017] [Indexed: 06/07/2023]
Abstract
This study aimed to evaluate the interface effect between five types of natural precipitated dust and two normal floras. Five kinds of natural dust (FC-1#, FC-2#, FC-15#, FC-18#, and FC-21#) were collected, and particle size and chemical components were detected by laser particle size analyzer and X-ray fluorescence (XRF). The elements, bacterial count, glucose (GLU) consumption, pH, and three biochemical indicators were measured after being co-cultured with Escherichia coli and Staphylococcus epidermidis in vitro. In addition, the changes of bacterial morphology were observed by scanning electron microscopy (SEM). Results showed that most particles contained a high level of SiO2, which diameter ranged from 0.3 to 1.0 μm. The concentration of Ca showed s significant increase upon interaction with E. coli and S. epidermidis in all dusts (p < 0.01). Moreover, FC-1# and FC-21# induced obvious growth in bacterial count, glucose consumption, and pH after they reacted with two normal floras (p < 0.05). Besides, the results also showed an apparent increase in the concentration of pyruvate, β-galactosidase, and alkaline phosphatase (AKP) after being co-cultured with E. coli and S. epidermidis, in which FC-1# is enhanced in the most obvious. The E. coli interacted with dust made more indentations in surface, and the configuration became thin and long. Some broken bacteria were present, and bacterial wreckage was visible. Plenty of S. epidermidis interacted with dust gathered in the indentations of dust, particularly in pleated surfaces. Further, these findings demonstrated that the alkaline dust with higher Ca content stimulated the growth of bacteria, and irregularly shaped or thin dust would be easier to combine with bacteria and conduct interface effect.
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Affiliation(s)
- Jianjun Deng
- Medical Laboratory, Sichuan Mianyang 404 Hospital, No. 2 Affiliated Hospital of North Sichuan Medical College, Mianyang, Sichuan Province, 621000, China
| | - Faqin Dong
- School of Environmental Resource and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan Province, 621003, China.
| | - Qunwei Dai
- School of Environmental Resource and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan Province, 621003, China
| | - Tingting Huo
- School of Environmental Resource and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan Province, 621003, China
| | - Ji Ma
- Medical Laboratory, Sichuan Mianyang 404 Hospital, No. 2 Affiliated Hospital of North Sichuan Medical College, Mianyang, Sichuan Province, 621000, China
| | - Xu Zhang
- Medical Laboratory, Sichuan Mianyang 404 Hospital, No. 2 Affiliated Hospital of North Sichuan Medical College, Mianyang, Sichuan Province, 621000, China
| | - Jie Yang
- Medical Laboratory, Sichuan Mianyang 404 Hospital, No. 2 Affiliated Hospital of North Sichuan Medical College, Mianyang, Sichuan Province, 621000, China
- Department of Clinical Laboratory, Southwest Medical University, Luzhou, Sichuan Province, 646000, China
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25
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Yang J, Huo T, Zhang X, Ma J, Wang Y, Dong F, Deng J. Oxidative stress and cell cycle arrest induced by short-term exposure to dustfall PM 2.5 in A549 cells. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:22408-22419. [PMID: 29098582 DOI: 10.1007/s11356-017-0430-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Accepted: 10/05/2017] [Indexed: 06/07/2023]
Abstract
It was reported that in vitro short-term exposure to PM2.5 caused different lung diseases through inflammatory response, immune toxicity, oxidative stress, and genetic mutations. However, the complex molecular biological mechanism for its toxicity had not been fully elucidated. Therefore, the present study investigated the cytotoxicity, oxidative damage, mitochondria damage, apoptosis, and cell cycle arrest of NX and QH PM2.5 in A549 cells. Further, cell cycle arrest-related gene levels in PM2.5-induced A549 cells were also detected. Our results suggested that PM2.5 reduced the cell viability in A549 cells. Simultaneously, excessive ROS decreased MMP levels and damaged mitochondrial membrane integrity and induced mitochondrial oxidative damage through the oxygen-dependent killer route, resulting in mitochondrial damage and cell apoptosis. Besides, the results also showed that PM2.5 induced A549 cell cycle alteration in G2/M phase after co-culture for 24 h. G2/M phase arrest was induced by upregulation of p53 and p21 and downregulation of CDK1 mRNA expression. In addition, lncRNA Sox2ot might play an important role as the specific oncogenes and it participated in G2/M phase arrest by regulating the expression of EZH2.
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Affiliation(s)
- Jie Yang
- Department of Clinical Laboratory, Southwest Medical University, Luzhou, Sichuan Province, 646000, China
| | - Tingting Huo
- School of Environmental Resource and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan Province, 621003, China
| | - Xu Zhang
- Medical Laboratory, Sichuan Mianyang 404 hospital, No.2 Affiliated Hospital of North Sichuan Medical College, Mianyang, Sichuan Province, 621000, China
| | - Jie Ma
- School of Environmental Resource and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan Province, 621003, China
| | - Yulin Wang
- Department of Clinical Laboratory, Southwest Medical University, Luzhou, Sichuan Province, 646000, China
| | - Faqin Dong
- School of Environmental Resource and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan Province, 621003, China
| | - Jianjun Deng
- Department of Clinical Laboratory, Southwest Medical University, Luzhou, Sichuan Province, 646000, China.
- Medical Laboratory, Sichuan Mianyang 404 hospital, No.2 Affiliated Hospital of North Sichuan Medical College, Mianyang, Sichuan Province, 621000, China.
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26
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Herbig B, Jörres RA, Schierl R, Simon M, Langner J, Seeger S, Nowak D, Karrasch S. Psychological and cognitive effects of laser printer emissions: A controlled exposure study. INDOOR AIR 2018; 28:112-124. [PMID: 28960517 DOI: 10.1111/ina.12429] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 09/23/2017] [Indexed: 06/07/2023]
Abstract
The possible impact of ultrafine particles from laser printers on human health is controversially discussed although there are persons reporting substantial symptoms in relation to these emissions. A randomized, single-blinded, cross-over experimental design with two exposure conditions (high-level and low-level exposure) was conducted with 23 healthy subjects, 14 subjects with mild asthma, and 15 persons reporting symptoms associated with laser printer emissions. To separate physiological and psychological effects, a secondary physiologically based categorization of susceptibility to particle effects was used. In line with results from physiological and biochemical assessments, we found no coherent, differential, or clinically relevant effects of different exposure conditions on subjective complaints and cognitive performance in terms of attention, short-term memory, and psychomotor performance. However, results regarding the psychological characteristics of participants and their situational perception confirm differences between the participants groups: Subjects reporting symptoms associated with laser printer emissions showed a higher psychological susceptibility for adverse reactions in line with previous results on persons with multiple chemical sensitivity or idiopathic environmental intolerance. In conclusion, acute psychological and cognitive effects of laser printer emissions were small and could be attributed only to different participant groups but not to differences in exposure conditions in terms of particle number concentrations.
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Affiliation(s)
- B Herbig
- Institute and Clinic for Occupational, Social and Environmental Medicine, University Hospital, LMU Munich, Munich, Germany
| | - R A Jörres
- Institute and Clinic for Occupational, Social and Environmental Medicine, University Hospital, LMU Munich, Munich, Germany
- Comprehensive Pneumology Center Munich (CPC-M), Member of the German Center for Lung Research, Munich, Germany
| | - R Schierl
- Institute and Clinic for Occupational, Social and Environmental Medicine, University Hospital, LMU Munich, Munich, Germany
| | - M Simon
- Institute and Clinic for Occupational, Social and Environmental Medicine, University Hospital, LMU Munich, Munich, Germany
| | - J Langner
- Division Materials and Air Pollutants, BAM Federal Institute for Materials Research and Testing, Berlin, Germany
| | - S Seeger
- Division Materials and Air Pollutants, BAM Federal Institute for Materials Research and Testing, Berlin, Germany
| | - D Nowak
- Institute and Clinic for Occupational, Social and Environmental Medicine, University Hospital, LMU Munich, Munich, Germany
- Comprehensive Pneumology Center Munich (CPC-M), Member of the German Center for Lung Research, Munich, Germany
| | - S Karrasch
- Institute and Clinic for Occupational, Social and Environmental Medicine, University Hospital, LMU Munich, Munich, Germany
- Comprehensive Pneumology Center Munich (CPC-M), Member of the German Center for Lung Research, Munich, Germany
- Institute of Epidemiology I, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
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27
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Hu Y, Wang LS, Li Y, Li QH, Li CL, Chen JM, Weng D, Li HP. Effects of particulate matter from straw burning on lung fibrosis in mice. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2017; 56:249-258. [PMID: 29031221 DOI: 10.1016/j.etap.2017.10.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 10/04/2017] [Accepted: 10/06/2017] [Indexed: 06/07/2023]
Abstract
OBJECTIVE To investigate the impacts of particulate matter 2.5 (PM2.5) from straw burning on the acute exacerbation of lung fibrosis in mice and the preventive effects of N-acetylcysteine (NAC). METHODS The composition, particle size, and 30-min concentration change in an exposure system of the PM2.5 from straw-burning were determined. Forty C57BL male mice were equally randomized to two groups: bleomycin (BLM)-induced lung fibrosis with an exposure to air (BLM+air) and BLM+PM2.5 groups. On day 7 after receiving intratracheal injection of BLM, mice were exposed to air or PM2.5 in an exposure system for 30min twice daily and then sacrificed after one-week or four-week exposure (10 mice/group). Mouse survival, lung histopathology, macrophage accumulation in the lung, and pro-inflammatory cytokine levels in alveolar lavage fluid (ALF) were determined. RESULTS PM2.5 from straw burning were mainly composed of organic matter (74.1%); 10.92% of the inorganic matter of the PM2.5 were chloride ion; 4.64% were potassium ion; other components were sulfate, nitrate, and nitrite. Particle size was 10nm-2μm. Histopathology revealed a greater extent of inflammatory cell infiltration in the lung, widened alveolar septum, and lung fibrosis in the BLM+PM2.5 group than in the BLM+air group and a greater extent of those adverse effects after four-week than after one-week exposure to PM2.5. The BLM+PM2.5 group also showed macrophages containing particular matter and increased pulmonary collagen deposition as the exposure to PM2.5 increased. Interleukin (IL)-6 and TNF-α levels in ALF were significantly higher in the BLM+PM2.5 group than in the BLM+air group (P<0.05) and significantly higher after four-week exposure than after one-week exposure to PM2.5 (P<0.05). TGF-β levels in ALF after four-week exposure were significantly higher in the BLM+PM2.5 group than in the BLM+air group (P<0.05). The levels of IL-6, TNF-α, and TGF-β in peripheral serum were not significantly different in the BLM+PM2.5 and BLM+air groups. Lung hydroxyproline contents increased as the exposure to PM2.5 increased and were significantly higher after four-week than after one-week exposure (P=0.019). Exposure to PM2.5 did not affect the survival of normal mice (100%) but reduced the survival of mice with BLM-induced IPF (30%), whereas NAC extended the survival (70%, vs. BLM+PM2.5, P=0.032). CONCLUSION Exposure of mice with BLM-induced IPF to PM2.5 from straw burning exacerbated lung inflammation and fibrosis and increased mortality; NAC increased the mouse survival, indicating protective effects.
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Affiliation(s)
- Yang Hu
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, Tongji University, School of Medicine, Shanghai 200433, China.
| | - Liu-Sheng Wang
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, Tongji University, School of Medicine, Shanghai 200433, China.
| | - Yan Li
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, Tongji University, School of Medicine, Shanghai 200433, China.
| | - Qiu-Hong Li
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, Tongji University, School of Medicine, Shanghai 200433, China.
| | - Chun-Lin Li
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
| | - Jian-Min Chen
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
| | - Dong Weng
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, Tongji University, School of Medicine, Shanghai 200433, China.
| | - Hui-Ping Li
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, Tongji University, School of Medicine, Shanghai 200433, China.
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28
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Karrasch S, Simon M, Herbig B, Langner J, Seeger S, Kronseder A, Peters S, Dietrich-Gümperlein G, Schierl R, Nowak D, Jörres RA. Health effects of laser printer emissions: a controlled exposure study. INDOOR AIR 2017; 27:753-765. [PMID: 28054389 DOI: 10.1111/ina.12366] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 12/22/2016] [Indexed: 06/06/2023]
Abstract
Ultrafine particles emitted from laser printers are suspected to elicit adverse health effects. We performed 75-minute exposures to emissions of laser printing devices (LPDs) in a standardized, randomized, cross-over manner in 23 healthy subjects, 14 mild, stable asthmatics, and 15 persons reporting symptoms associated with LPD emissions. Low-level exposures (LLE) ranged at the particle background (3000 cm-3 ) and high-level exposures (HLE) at 100 000 cm-3 . Examinations before and after exposures included spirometry, body plethysmography, transfer factors for CO and NO (TLCO, TLNO), bronchial and alveolar NO, cytokines in serum and nasal secretions (IL-1β, IL-5, IL-6, IL-8, GM-CSF, IFNγ, TNFα), serum ECP, and IgE. Across all participants, no statistically significant changes occurred for lung mechanics and NO. There was a decrease in volume-related TLNO that was more pronounced in HLE, but the difference to LLE was not significant. ECP and IgE increased in the same way after exposures. Nasal IL-6 showed a higher increase after LLE. There was no coherent pattern regarding the responses in the participant subgroups or single sets of variables. In conclusion, the experimental acute responses to short but very high-level LPD exposures were small and did not indicate clinically relevant effects compared to low particle number concentrations.
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Affiliation(s)
- S Karrasch
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
- Institute of Epidemiology I, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - M Simon
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
| | - B Herbig
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
| | - J Langner
- Division Materials and Air Pollutants, BAM Federal Institute for Materials Research and Testing, Berlin, Germany
| | - S Seeger
- Division Materials and Air Pollutants, BAM Federal Institute for Materials Research and Testing, Berlin, Germany
| | - A Kronseder
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
| | - S Peters
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
| | - G Dietrich-Gümperlein
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
| | - R Schierl
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
| | - D Nowak
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
- Comprehensive Pneumology Center Munich (CPC-M), Member of the German Center for Lung Research, Munich/Neuherberg, Germany
| | - R A Jörres
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich, Ludwig-Maximilians-Universität, Munich, Germany
- Comprehensive Pneumology Center Munich (CPC-M), Member of the German Center for Lung Research, Munich/Neuherberg, Germany
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Pirela SV, Martin J, Bello D, Demokritou P. Nanoparticle exposures from nano-enabled toner-based printing equipment and human health: state of science and future research needs. Crit Rev Toxicol 2017; 47:678-704. [PMID: 28524743 DOI: 10.1080/10408444.2017.1318354] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Toner formulations used by laser printers (LP) and photocopiers (PC), collectively called "toner-based printing equipment" (TPE), are nano-enabled products (NEP) because they contain several engineered nanomaterials (ENM) that improve toner performance. It has been shown that during consumer use (printing), these ENM are released in the air, together with other semi-volatile organic nanoparticles, and newly formed gaseous co-pollutants such as volatile organic compounds (VOC). The aim of this review is to detail and analyze physico-chemical and morphological (PCM), as well as the toxicological properties of particulate matter (PM) emissions from TPE. The review covers evolution of science since the early 2000, when this printing technology first became a subject of public interest, as well as the lagging regulatory framework around it. Important studies that have significantly changed our understanding of these exposures are also highlighted. The review continues with a critical appraisal of the most up-to-date cellular, animal and human toxicological evidence on the potential adverse human health effects of PM emitted from TPE. We highlight several limitations of existing studies, including (i) use of high and often unrealistic doses in vitro or in vivo; (ii) unrealistically high-dose rates in intratracheal instillation studies; (iii) improper use of toners as surrogate for emitted nanoparticles; (iv) lack of or inadequate PCM characterization of exposures; and (v) lack of dosimetry considerations in in vitro studies. Presently, there is compelling evidence that the PM0.1 from TPE are biologically active and capable of inducing oxidative stress in vitro and in vivo, respiratory tract inflammation in vivo (in rats) and in humans, several endpoints of cellular injury in monocultures and co-cultures, including moderate epigenetic modifications in vitro. In humans, limited epidemiological studies report typically 2-3 times higher prevalence of chronic cough, wheezing, nasal blockage, excessive sputum production, breathing difficulties, and shortness of breath, in copier operators relative to controls. Such symptoms can be exacerbated during chronic exposures, and in individuals susceptible to inhaled pollutants. Thus respiratory, immunological, cardiovascular, and other disorders may be developed following such exposures; however, further toxicological and larger scale molecular epidemiological studies must be done to fully understand the mechanism of action of these TPE emitted nanoparticles. Major research gaps have also been identified. Among them, a methodical risk assessment based on "real world" exposures rather than on the toner particles alone needs to be performed to provide the much-needed data to establish regulatory guidelines protective of individuals exposed to TPE emissions at both the occupational and consumer level. Industry-wide molecular epidemiology as well as mechanistic animal and human studies are also urgently needed.
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Affiliation(s)
- Sandra Vanessa Pirela
- a Department of Environmental Health, Harvard T.H. Chan School of Public Health , Center for Nanotechnology and Nanotoxicology , Boston , MA , USA
| | - John Martin
- b Department of Public Health , UMass Lowell , Lowell , MA , USA
| | - Dhimiter Bello
- a Department of Environmental Health, Harvard T.H. Chan School of Public Health , Center for Nanotechnology and Nanotoxicology , Boston , MA , USA.,b Department of Public Health , UMass Lowell , Lowell , MA , USA
| | - Philip Demokritou
- a Department of Environmental Health, Harvard T.H. Chan School of Public Health , Center for Nanotechnology and Nanotoxicology , Boston , MA , USA
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30
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Kasi V, Elango N, Ananth S, Vembhu B, Poornima JG. Occupational exposure to photocopiers and their toners cause genotoxicity. Hum Exp Toxicol 2017; 37:205-217. [DOI: 10.1177/0960327117693068] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Photocopier machines are inevitable office equipment, but they are also sources of air pollution. Millions of people across the world are involved in the operation and maintenance of photocopiers. We aimed to evaluate the potential genotoxic effects of exposure to photocopiers in photocopier operators and maintenance personnel by Comet assay. This study involved 50 photocopier operators, 61 maintenance personnel and 52 controls. Both the photocopier exposed groups exhibited significantly increased DNA damage when compared to controls. Cumulative exposure to photocopiers was the most significant contributor for genotoxicity ( p < 0.001). Genotoxicity among photocopier maintenance personnel may be due to the presence of carbon black, iron, silicon, magnetite and the high levels of other elements in the photocopier toners. Genotoxicity among photocopier operators might be due to exposure to high levels of particulate matter and volatile organic compounds emitted by photocopiers during operation. Research is essential to improve toner manufacturing processes and chemical composition of toners to reduce genotoxicity. Clean technologies are the need of the day to cut down on particulate matter and volatile organic compound emissions from photocopiers.
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Affiliation(s)
- V Kasi
- Department of Biochemistry, Biotechnology and Bioinformatics, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore, Tamil Nadu, India
- Department of Central Research Laboratory, Velammal Medical College Hospital & Research Institute, Anuppanadi, Madurai 625009, Tamil Nadu, India
| | - N Elango
- Department of Biochemistry, Biotechnology and Bioinformatics, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore, Tamil Nadu, India
- Department of Biochemistry, Dr. N. G. P Arts and Science College, Coimbatore, Tamil Nadu, India
| | - S Ananth
- Department of Biochemistry, Biotechnology and Bioinformatics, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore, Tamil Nadu, India
| | - B Vembhu
- Department of Biochemistry, Biotechnology and Bioinformatics, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore, Tamil Nadu, India
| | - JG Poornima
- Department of Biochemistry, Biotechnology and Bioinformatics, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore, Tamil Nadu, India
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31
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DeLoid GM, Cohen JM, Pyrgiotakis G, Demokritou P. Preparation, characterization, and in vitro dosimetry of dispersed, engineered nanomaterials. Nat Protoc 2017; 12:355-371. [PMID: 28102836 DOI: 10.1038/nprot.2016.172] [Citation(s) in RCA: 180] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Evidence continues to grow of the importance of in vitro and in vivo dosimetry in the hazard assessment and ranking of engineered nanomaterials (ENMs). Accurate dose metrics are particularly important for in vitro cellular screening to assess the potential health risks or bioactivity of ENMs. To ensure meaningful and reproducible quantification of in vitro dose, with consistent measurement and reporting between laboratories, it is necessary to adopt standardized and integrated methodologies for (i) generation of stable ENM suspensions in cell culture media; (ii) colloidal characterization of suspended ENMs, particularly of properties that determine particle kinetics in an in vitro system (size distribution and formed agglomerate effective density); and (iii) robust numerical fate and transport modeling for accurate determination of the ENM dose delivered to cells over the course of the in vitro exposure. Here we present an integrated comprehensive protocol based on such a methodology for in vitro dosimetry, including detailed standardized procedures for each of these three critical aims. The entire protocol requires ∼6-12 h to complete.
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Affiliation(s)
- Glen M DeLoid
- Center for Nanotechnology and Nanotoxicology, HSPH-NIEHS Nanosafety Research Center, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA
| | - Joel M Cohen
- Center for Nanotechnology and Nanotoxicology, HSPH-NIEHS Nanosafety Research Center, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA
| | - Georgios Pyrgiotakis
- Center for Nanotechnology and Nanotoxicology, HSPH-NIEHS Nanosafety Research Center, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, HSPH-NIEHS Nanosafety Research Center, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA
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32
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Watson-Wright C, Singh D, Demokritou P. Toxicological Implications of Released Particulate Matter during Thermal Decomposition of Nano-Enabled Thermoplastics. NANOIMPACT 2017; 5:29-40. [PMID: 29333505 PMCID: PMC5764161 DOI: 10.1016/j.impact.2016.12.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Nano-enabled thermoplastics are part of the growing market of nano-enabled products (NEPs) that have vast utility in several industries and consumer goods. The use and disposal of NEPs at their end of life has raised concerns about the potential release of constituent engineered nanomaterials (ENMs) during thermal decomposition and their impact on environmental health and safety. To investigate this issue, industrially relevant nano-enabled thermoplastics including polyurethane, polycarbonate, and polypropylene containing carbon nanotubes (0.1 and 3% w/v, respectively), polyethylene containing nanoscale iron oxide (5% w/v), and ethylene vinyl acetate containing nanoscale titania (2 and 5% w/v) along with their pure thermoplastic matrices were thermally decomposed using the recently developed lab based Integrated Exposure Generation System (INEXS). The life cycle released particulate matter (called LCPM) was monitored using real time instrumentation, size fractionated, sampled, extracted and prepared for toxicological analysis using primary small airway epithelial cells to assess potential toxicological effects. Various cellular assays were used to assess reactive oxygen species and total glutathione as measurements of oxidative stress along with mitochondrial function, cellular viability, and DNA damage. By comparing toxicological profiles of LCPM released from polymer only (control) with nano-enabled LCPM, potential nanofiller effects due to the use of ENMs were determined. We observed associations between NEP properties such as the percent nanofiller loading, host matrix, and nanofiller chemical composition and the physico-chemical properties of released LCPM, which were linked to biological outcomes. More specifically, an increase in percent nanofiller loading promoted a toxicological response independent of increasing LCPM dose. Importantly, differences in host matrix and nanofiller composition were shown to enhance biological activity and toxicity of LCPM. This work highlights the importance of assessing the toxicological properties of LCPM and raises environmental health and safety concerns of nano-enabled products at their end of life during thermal decomposition/incineration.
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Affiliation(s)
| | | | - Philip Demokritou
- To whom correspondence should be addressed: Prof. Philip Demokritou, Associate Professor, Department of Environmental Health, Harvard T.H. Chan School of Public, Health, 677 Huntington Avenue, Boston, MA 02115, USA, , Tel: 617-432-3481
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33
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Zhao J, Pyrgiotakis G, Demokritou P. Development and characterization of electronic-cigarette exposure generation system (Ecig-EGS) for the physico-chemical and toxicological assessment of electronic cigarette emissions. Inhal Toxicol 2016; 28:658-669. [PMID: 27829296 PMCID: PMC5496446 DOI: 10.1080/08958378.2016.1246628] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 10/05/2016] [Indexed: 12/31/2022]
Abstract
Electronic cigarettes (e-cig) have been introduced as a nicotine replacement therapy and have gained increasing attention and popularity. However, while findings on possible toxicological implications continue to grow, major knowledge gaps on both the complex chemistry of the exposure and toxicity exist, prohibiting public health assessors from assessing risks. Here, a versatile electronic cigarette exposure generation system (Ecig-EGS) has been developed and characterized. Ecig-EGS allows generation of real world e-cig emission profiles under controlled operational conditions, real time monitoring and time-integrated particle/gas sampling for physico-chemical characterization, and toxicological assessment (both in vitro and in vivo). The platform is highly versatile and can be used with all e-cig types. It enables generation of precisely controlled e-cig exposure while critical operational parameters and environmental mixing conditions can be adjusted in a systematic manner to assess their impact on complex chemistry and toxicity of emissions. Results proved the versatility and reproducibility of Ecig-EGS. E-cig emission was found to contain 106-107 particles/cm3 with the mode diameter around 200 nm, under air change rate of 60/h. Elevated CO2 and volatile organic specie generation was also observed. Furthermore, environmental mixing conditions also influenced e-cig emission profile. The versatility of Ecig-EGS will enable linking of operational and environmental parameters with exposure chemistry and toxicology and help in assessing health risks.
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Affiliation(s)
- Jiayuan Zhao
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, MA, USA
| | - Georgios Pyrgiotakis
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, MA, USA
| | - Philip Demokritou
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, MA, USA
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34
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IKEGAMI K, HASEGAWA M, ANDO H, HATA K, KITAMURA H, OGAMI A, HIGASHI T. A cohort study of the acute and chronic respiratory effects of toner exposure among handlers: a longitudinal analyses from 2004 to 2013. INDUSTRIAL HEALTH 2016; 54:448-459. [PMID: 27021062 PMCID: PMC5054286 DOI: 10.2486/indhealth.2015-0202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 03/01/2016] [Indexed: 06/05/2023]
Abstract
This study examines the acute and chronic respiratory effects of toner exposure based on markers for interstitial pneumonia, oxidative stress and pulmonary function tests. A total of 112 subjects working in a Japanese toner and photocopier manufacturing company participated in this study in 2004. We annually conducted personal exposure measurements, pulmonary function tests, chest X-ray examinations, biomarkers, and questionnaires on respiratory symptoms to the subjects. We report in this paper the results of the analysis of combined annual survey point data from 2004 to 2008 and data from three annual survey points, 2004, 2008, and 2013. During these survey periods, we observed that none of subjects had a new onset of respiratory disease or died of such a disease. In both the analyses, there were no significant differences in each biomarker and pulmonary function tests within the subjects, nor between a toner-handling group and a non-toner-handling group, except for a few results on pulmonary function tests. The findings of this study suggest that there were no acute and chronic respiratory effects of toner exposure in this cohort group, although the number of subjects was small and the level of toner exposure in this worksite was low.
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Affiliation(s)
- Kazunori IKEGAMI
- Department of Work Systems and Health, Institute of Industrial Ecological Science, University of Occupational and Environmental Health, Japan
| | - Masayuki HASEGAWA
- Department of Work Systems and Health, Institute of Industrial Ecological Science, University of Occupational and Environmental Health, Japan
| | - Hajime ANDO
- Department of Work Systems and Health, Institute of Industrial Ecological Science, University of Occupational and Environmental Health, Japan
| | - Koichi HATA
- Department of Work Systems and Health, Institute of Industrial Ecological Science, University of Occupational and Environmental Health, Japan
| | - Hiroko KITAMURA
- Department of Work Systems and Health, Institute of Industrial Ecological Science, University of Occupational and Environmental Health, Japan
| | - Akira OGAMI
- Department of Work Systems and Health, Institute of Industrial Ecological Science, University of Occupational and Environmental Health, Japan
| | - Toshiaki HIGASHI
- Department of Work Systems and Health, Institute of Industrial Ecological Science, University of Occupational and Environmental Health, Japan
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35
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Lee S, Sohal IS, Therrien MA, Pal AK, Bello D, Shea TB. Additive Impairment of Synaptic Signaling in Cultured Cortical Neurons by Exogenously-Applied Oligomerized Amyloid-β and Airborne Nanoparticles Generated during Photocopying. J Alzheimers Dis 2016; 47:49-54. [PMID: 26402753 DOI: 10.3233/jad-150099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Photocopying in offices and printing centers releases nanoparticles that can reach the brain following inhalation. We examined whether subcytotoxic levels of airborne photocopy-emitted nanoparticles could potentiate perturbation of synaptic signaling in cultured neurons following exposure to amyloid-β (Aβ). Signaling was only transiently inhibited by Aβ or nanoparticles individually, but remained statistically reduced in cultures receiving both after 24 h. In vitro and in vivo studies with copier emitted nanoparticles have consistently demonstrated inflammation, oxidative stress, and cytotoxicity. Since Aβ can accumulate years before cognitive decline, subcytotoxic levels of nanoparticles are one factor that could potentiate Aβ-induced impairment of synaptic activity during these early stages.
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Affiliation(s)
- Sangmook Lee
- Laboratory for Neuroscience, University of Massachusetts Lowell, Lowell, MA, USA.,Departments of Biological Sciences, University of Massachusetts Lowell, Lowell, MA, USA
| | - Ikjot S Sohal
- Laboratory for Neuroscience, University of Massachusetts Lowell, Lowell, MA, USA.,Biomedical Engineering and Biotechnology Program, University of Massachusetts Lowell, Lowell, MA, USA
| | - Mikaela A Therrien
- Laboratory for Neuroscience, University of Massachusetts Lowell, Lowell, MA, USA.,Departments of Biological Sciences, University of Massachusetts Lowell, Lowell, MA, USA
| | - Anoop K Pal
- Departments of Work Environment, University of Massachusetts Lowell, Lowell, MA, USA.,Biomedical Engineering and Biotechnology Program, University of Massachusetts Lowell, Lowell, MA, USA
| | - Dhimiter Bello
- Nanomanufacturing Center for Excellence, University of Massachusetts Lowell, Lowell, MA, USA.,Departments of Work Environment, University of Massachusetts Lowell, Lowell, MA, USA
| | - Thomas B Shea
- Laboratory for Neuroscience, University of Massachusetts Lowell, Lowell, MA, USA.,Departments of Biological Sciences, University of Massachusetts Lowell, Lowell, MA, USA
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DeLoid G, Casella B, Pirela S, Filoramo R, Pyrgiotakis G, Demokritou P, Kobzik L. Effects of engineered nanomaterial exposure on macrophage innate immune function. NANOIMPACT 2016; 2:70-81. [PMID: 29568809 PMCID: PMC5860825 DOI: 10.1016/j.impact.2016.07.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Increasing use of engineered nanomaterials (ENMs) means increased human exposures. Potential adverse effects include those on the immune system, ranging from direct toxicity to impairment of defenses against environmental pathogens and toxins. Effects on lung macrophages may be especially prominent, because they serve to clear foreign materials like ENMs and bacterial pathogens. We investigated the effects of 4 hour exposures over a range of concentrations, of a panel of industry-relevant ENMs, including SiO2, Fe2O3, ZnO, CeO2, TiO2, and an Ag/SiO2 composite, on human THP-1 macrophages. Effects on phagocytosis of latex beads, and phagocytosis and killing of Francisella tularensis (FT), as well as viability, oxidative stress and mitochondrial integrity, were measured by automated scanning confocal microscopy and image analysis. Results revealed some notable patterns: 1) Phagocytosis of unopsonized beads was increased, whereas that of opsonized beads was decreased, by all ENMs, with the exception of ZnO, which reduced both opsonized and unopsonized uptake; 2) Uptake of opsonized and unopsonized FT was either impaired or unaffected by all ENMs, with the exception of CeO2, which increased phagocytosis of unopsonized FT; 3) Macrophage killing of FT tended to improve with all ENMs; and 4) Viability was unaffected immediately following exposures with all ENMs tested, but was significantly decreased 24 hours after exposures to Ag/SiO2 and ZnO ENMs. The results reveal a complex landscape of ENM effects on macrophage host defenses, including both enhanced and reduced capacities, and underscore the importance of robust hazard assessment, including immunotoxicity assessment, of ENMs.
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Affiliation(s)
- Glen DeLoid
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, Boston, MA, United States of America
- corresponding author: Glen M. DeLoid,
| | - Beatriz Casella
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, Boston, MA, United States of America
- Faculty of Medicine, University of São Paulo, São Paulo, Brazil
| | - Sandra Pirela
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, Boston, MA, United States of America
| | - Rose Filoramo
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, Boston, MA, United States of America
| | - Georgios Pyrgiotakis
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, Boston, MA, United States of America
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, Boston, MA, United States of America
| | - Lester Kobzik
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, Boston, MA, United States of America
- Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, United States of America
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Pirela SV, Miousse IR, Lu X, Castranova V, Thomas T, Qian Y, Bello D, Kobzik L, Koturbash I, Demokritou P. Effects of Laser Printer-Emitted Engineered Nanoparticles on Cytotoxicity, Chemokine Expression, Reactive Oxygen Species, DNA Methylation, and DNA Damage: A Comprehensive in Vitro Analysis in Human Small Airway Epithelial Cells, Macrophages, and Lymphoblasts. ENVIRONMENTAL HEALTH PERSPECTIVES 2016; 124:210-9. [PMID: 26080392 PMCID: PMC4749083 DOI: 10.1289/ehp.1409582] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Accepted: 06/12/2015] [Indexed: 05/20/2023]
Abstract
BACKGROUND Engineered nanomaterials (ENMs) incorporated into toner formulations of printing equipment become airborne during consumer use. Although information on the complex physicochemical and toxicological properties of both toner powders and printer-emitted particles (PEPs) continues to grow, most toxicological studies have not used the actual PEPs but rather have primarily used raw toner powders, which are not representative of current exposures experienced at the consumer level during printing. OBJECTIVES We assessed the biological responses of a panel of human cell lines to PEPs. METHODS Three physiologically relevant cell lines--small airway epithelial cells (SAECs), macrophages (THP-1 cells), and lymphoblasts (TK6 cells)--were exposed to PEPs at a wide range of doses (0.5-100 μg/mL) corresponding to human inhalation exposure durations at the consumer level of 8 hr or more. Following treatment, toxicological parameters reflecting distinct mechanisms were evaluated. RESULTS PEPs caused significant membrane integrity damage, an increase in reactive oxygen species (ROS) production, and an increase in pro-inflammatory cytokine release in different cell lines at doses equivalent to exposure durations from 7.8 to 1,500 hr. Furthermore, there were differences in methylation patterns that, although not statistically significant, demonstrate the potential effects of PEPs on the overall epigenome following exposure. CONCLUSIONS The in vitro findings obtained in this study suggest that laser printer-emitted engineered nanoparticles may be deleterious to lung cells and provide preliminary evidence of epigenetic modifications that might translate to pulmonary disorders.
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Affiliation(s)
- Sandra V. Pirela
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts, USA
| | - Isabelle R. Miousse
- Department of Environmental and Occupational Health, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Xiaoyan Lu
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts, USA
| | - Vincent Castranova
- Department of Pharmaceutical Sciences, West Virginia University, Morgantown, West Virginia, USA
| | - Treye Thomas
- Office of Hazard Identification and Reduction, U.S. Consumer Product Safety Commission, Rockville, Maryland, USA
| | - Yong Qian
- Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA
| | - Dhimiter Bello
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts, USA
- Department of Work Environment, University of Massachusetts-Lowell, Lowell, Massachusetts, USA
| | - Lester Kobzik
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts, USA
| | - Igor Koturbash
- Department of Environmental and Occupational Health, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Philip Demokritou
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts, USA
- Address correspondence to P. Demokritou, Department of Environmental Health, Harvard T.H. Chan School of Public Health, Harvard University, 665 Huntington Ave., Room 1310B, Boston, MA 02115 USA. (617) 432-3481. E-mail:
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Pirela SV, Lu X, Miousse I, Sisler JD, Qian Y, Guo N, Koturbash I, Castranova V, Thomas T, Godleski J, Demokritou P. Effects of intratracheally instilled laser printer-emitted engineered nanoparticles in a mouse model: A case study of toxicological implications from nanomaterials released during consumer use. NANOIMPACT 2016; 1:1-8. [PMID: 26989787 PMCID: PMC4791579 DOI: 10.1016/j.impact.2015.12.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Incorporation of engineered nanomaterials (ENMs) into toners used in laser printers has led to countless quality and performance improvements. However, the release of ENMs during printing (consumer use) has raised concerns about their potential adverse health effects. The aim of this study was to use "real world" printer-emitted particles (PEPs), rather than raw toner powder, and assess the pulmonary responses following exposure by intratracheal instillation. Nine-week old male Balb/c mice were exposed to various doses of PEPs (0.5, 2.5 and 5 mg/kg body weight) by intratracheal instillation. These exposure doses are comparable to real world human inhalation exposures ranging from 13.7 to 141.9 h of printing. Toxicological parameters reflecting distinct mechanisms of action were evaluated, including lung membrane integrity, inflammation and regulation of DNA methylation patterns. Results from this in vivo toxicological analysis showed that while intratracheal instillation of PEPs caused no changes in the lung membrane integrity, there was a pulmonary immune response, indicated by an elevation in neutrophil and macrophage percentage over the vehicle control and low dose PEPs groups. Additionally, exposure to PEPs upregulated expression of the Ccl5 (Rantes), Nos1 and Ucp2 genes in the murine lung tissue and modified components of the DNA methylation machinery (Dnmt3a) and expression of transposable element (TE) LINE-1 compared to the control group. These genes are involved in both the repair process from oxidative damage and the initiation of immune responses to foreign pathogens. The results are in agreement with findings from previous in vitro cellular studies and suggest that PEPs may cause immune responses in addition to modifications in gene expression in the murine lung at doses that can be comparable to real world exposure scenarios, thereby raising concerns of deleterious health effects.
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Affiliation(s)
- Sandra V. Pirela
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, T. H. Chan School of Public Health, Harvard University, Boston, MA, United States
| | - Xiaoyan Lu
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, T. H. Chan School of Public Health, Harvard University, Boston, MA, United States
| | - Isabelle Miousse
- Department of Environmental and Occupational Health, College of Public Health, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Jennifer D. Sisler
- Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
| | - Yong Qian
- Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
| | - Nancy Guo
- Department of Pharmaceutical Sciences/Mary Babb Randolph Cancer Center, West Virginia University, Morgantown, WV, United States
| | - Igor Koturbash
- Department of Environmental and Occupational Health, College of Public Health, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Vincent Castranova
- Department of Pharmaceutical Sciences/Mary Babb Randolph Cancer Center, West Virginia University, Morgantown, WV, United States
| | - Treye Thomas
- U.S. Consumer Product Safety Commission, Office of Hazard Identification and Reduction, Rockville, MD, United States
| | - John Godleski
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, T. H. Chan School of Public Health, Harvard University, Boston, MA, United States
| | - Philip Demokritou
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, T. H. Chan School of Public Health, Harvard University, Boston, MA, United States
- Corresponding author at: Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, T. H. Chan School of Public Health, Harvard University, 665 Huntington Avenue, Room 1310, Boston, MA 02115, United States. Tel.: +1 917 432 3481. (P. Demokritou)
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Martin J, Bello D, Bunker K, Shafer M, Christiani D, Woskie S, Demokritou P. Occupational exposure to nanoparticles at commercial photocopy centers. JOURNAL OF HAZARDOUS MATERIALS 2015; 298:351-360. [PMID: 26148960 DOI: 10.1016/j.jhazmat.2015.06.021] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 06/05/2015] [Accepted: 06/08/2015] [Indexed: 06/04/2023]
Abstract
Photocopiers emit high levels of nanoparticles (PM0.1). To-date little is known of physicochemical composition of PM0.1 in real workplace settings. Here we perform a comprehensive physicochemical and morphological characterization of PM0.1 and raw materials (toners and paper) at eight commercial photocopy centers that use color and monochrome photocopiers over the course of a full week. We document high PM0.1 exposures with complex composition and several ENM in toners and PM0.1. Daily geometric mean PM0.1 concentrations ranged from 3700 to 34000 particles/cubic-centimeter (particles/cm(3)) (GSD 1.4-3.3), up to 12 times greater than background, with transient peaks >1.4 million particles/cm(3). PM0.1 contained 6-63% organic carbon, <1% elemental carbon, and 2-8% metals, including iron, zinc, titania, chromium, nickel and manganese, typically in the <0.01-1% range, and in agreement with toner composition. These findings document widespread ENM in toner formulations and high nanoparticle exposures are an industry-wide phenomenon. It further calls attention to the need to substantially redesign the interface of this technology with workers and consumers.
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Affiliation(s)
- John Martin
- Department of Work Environment, University of Massachusetts, Lowell, MA, USA
| | - Dhimiter Bello
- Department of Work Environment, University of Massachusetts, Lowell, MA, USA; Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, MA, USA.
| | | | - Martin Shafer
- Wisconsin State of Hygiene Laboratory, 2601 Agriculture Drive, Madison, WI, USA
| | - David Christiani
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, MA, USA
| | - Susan Woskie
- Department of Work Environment, University of Massachusetts, Lowell, MA, USA
| | - Philip Demokritou
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, MA, USA
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DeLoid GM, Cohen JM, Pyrgiotakis G, Pirela SV, Pal A, Liu J, Srebric J, Demokritou P. Advanced computational modeling for in vitro nanomaterial dosimetry. Part Fibre Toxicol 2015; 12:32. [PMID: 26497802 PMCID: PMC4619515 DOI: 10.1186/s12989-015-0109-1] [Citation(s) in RCA: 112] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 10/12/2015] [Indexed: 12/27/2022] Open
Abstract
Background Accurate and meaningful dose metrics are a basic requirement for in vitro screening to assess potential health risks of engineered nanomaterials (ENMs). Correctly and consistently quantifying what cells “see,” during an in vitro exposure requires standardized preparation of stable ENM suspensions, accurate characterizatoin of agglomerate sizes and effective densities, and predictive modeling of mass transport. Earlier transport models provided a marked improvement over administered concentration or total mass, but included assumptions that could produce sizable inaccuracies, most notably that all particles at the bottom of the well are adsorbed or taken up by cells, which would drive transport downward, resulting in overestimation of deposition. Methods Here we present development, validation and results of two robust computational transport models. Both three-dimensional computational fluid dynamics (CFD) and a newly-developed one-dimensional Distorted Grid (DG) model were used to estimate delivered dose metrics for industry-relevant metal oxide ENMs suspended in culture media. Both models allow simultaneous modeling of full size distributions for polydisperse ENM suspensions, and provide deposition metrics as well as concentration metrics over the extent of the well. The DG model also emulates the biokinetics at the particle-cell interface using a Langmuir isotherm, governed by a user-defined dissociation constant, KD, and allows modeling of ENM dissolution over time. Results Dose metrics predicted by the two models were in remarkably close agreement. The DG model was also validated by quantitative analysis of flash-frozen, cryosectioned columns of ENM suspensions. Results of simulations based on agglomerate size distributions differed substantially from those obtained using mean sizes. The effect of cellular adsorption on delivered dose was negligible for KD values consistent with non-specific binding (> 1 nM), whereas smaller values (≤ 1 nM) typical of specific high-affinity binding resulted in faster and eventual complete deposition of material. Conclusions The advanced models presented provide practical and robust tools for obtaining accurate dose metrics and concentration profiles across the well, for high-throughput screening of ENMs. The DG model allows rapid modeling that accommodates polydispersity, dissolution, and adsorption. Result of adsorption studies suggest that a reflective lower boundary condition is appropriate for modeling most in vitro ENM exposures. Electronic supplementary material The online version of this article (doi:10.1186/s12989-015-0109-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Glen M DeLoid
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 655 Huntington Ave, Boston, MA, 02115, USA.
| | - Joel M Cohen
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 655 Huntington Ave, Boston, MA, 02115, USA
| | - Georgios Pyrgiotakis
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 655 Huntington Ave, Boston, MA, 02115, USA
| | - Sandra V Pirela
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 655 Huntington Ave, Boston, MA, 02115, USA
| | - Anoop Pal
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 655 Huntington Ave, Boston, MA, 02115, USA
| | - Jiying Liu
- Department of Architectural Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.,School of Thermal Engineering, Shandong Jianzhu University, 1000 Fengming Rd, Jinan, China
| | - Jelena Srebric
- Department of Architectural Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.,Department of Mechanical Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 655 Huntington Ave, Boston, MA, 02115, USA.
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Cohen JM, DeLoid GM, Demokritou P. A critical review of in vitro dosimetry for engineered nanomaterials. Nanomedicine (Lond) 2015; 10:3015-3032. [PMID: 26419834 DOI: 10.2217/nnm.15.129] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
A major obstacle in the development of accurate cellular models for investigating nanobio interactions in vitro is determination of physiologically relevant measures of dose. Comparison of biological responses to nanoparticle exposure typically relies on administered dose metrics such as mass concentration of suspended particles, rather than the effective dose of particles that actually comes in contact with the cells over the time of exposure. Adoption of recently developed dosimetric methodologies will facilitate determination of effective dose delivered to cells in vitro, thereby improving the accuracy and reliability of in vitro screening data, validation of in vitro with in vivo data, and comparison across multiple datasets for the large variety of nanomaterials currently in the market.
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Affiliation(s)
- Joel M Cohen
- Center for Nanotechnology & Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, 655 Huntington Ave Boston, MA 02115, USA
| | - Glen M DeLoid
- Center for Nanotechnology & Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, 655 Huntington Ave Boston, MA 02115, USA
| | - Philip Demokritou
- Center for Nanotechnology & Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, 655 Huntington Ave Boston, MA 02115, USA
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Zhou EH, Watson C, Pizzo R, Cohen J, Dang Q, Ferreira de Barros PM, Park CY, Chen C, Brain JD, Butler JP, Ruberti JW, Fredberg JJ, Demokritou P. Assessing the impact of engineered nanoparticles on wound healing using a novel in vitro bioassay. Nanomedicine (Lond) 2015; 9:2803-15. [PMID: 24823434 DOI: 10.2217/nnm.14.40] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
AIM As engineered nanoparticles (ENPs) increasingly enter consumer products, humans become increasingly exposed. The first line of defense against ENPs is the epithelium, the integrity of which can be compromised by wounds induced by trauma, infection, or surgery, but the implications of ENPs on wound healing are poorly understood. MATERIALS & METHODS Herein, we developed an in vitro assay to assess the impact of ENPs on the wound healing of cells from human cornea. RESULTS & DISCUSSION We show that industrially relevant ENPs impeded wound healing and cellular migration in a manner dependent on the composition, dose and size of the ENPs as well as cell type. CuO and ZnO ENPs impeded both viability and wound healing for both fibroblasts and epithelial cells. Carboxylated polystyrene ENPs retarded wound healing of corneal fibroblasts without affecting viability. CONCLUSION Our results highlight the impact of ENPs on cellular wound healing and provide useful tools for studying the physiological impact of ENPs.
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Affiliation(s)
- Enhua H Zhou
- Department of Environmental Health, Harvard School of Public Health, Boston, MA 02115, USA
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Pirela SV, Pyrgiotakis G, Bello D, Thomas T, Castranova V, Demokritou P. Development and characterization of an exposure platform suitable for physico-chemical, morphological and toxicological characterization of printer-emitted particles (PEPs). Inhal Toxicol 2015; 26:400-8. [PMID: 24862974 DOI: 10.3109/08958378.2014.908987] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
An association between laser printer use and emissions of particulate matter (PM), ozone and volatile organic compounds has been reported in recent studies. However, the detailed physico-chemical, morphological and toxicological characterization of these printer-emitted particles (PEPs) and possible incorporation of engineered nanomaterials into toner formulations remain largely unknown. In this study, a printer exposure generation system suitable for the physico-chemical, morphological, and toxicological characterization of PEPs was developed and used to assess the properties of PEPs from the use of commercially available laser printers. The system consists of a glovebox type environmental chamber for uninterrupted printer operation, real-time and time-integrated particle sampling instrumentation for the size fractionation and sampling of PEPs and an exposure chamber for inhalation toxicological studies. Eleven commonly used laser printers were evaluated and ranked based on their PM emission profiles. Results show PM peak emissions are brand independent and varied between 3000 to 1 300 000 particles/cm³, with modal diameters ranging from 49 to 208 nm, with the majority of PEPs in the nanoscale (<100 nm) size. Furthermore, it was shown that PEPs can be affected by certain operational parameters and printing conditions. The release of nanoscale particles from a nano-enabled product (printer toner) raises questions about health implications to users. The presented PEGS platform will help in assessing the toxicological profile of PEPs and the link to the physico-chemical and morphological properties of emitted PM and toner formulations.
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Affiliation(s)
- Sandra V Pirela
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health , Boston, MA , USA
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Pirela SV, Sotiriou GA, Bello D, Shafer M, Bunker KL, Castranova V, Thomas T, Demokritou P. Consumer exposures to laser printer-emitted engineered nanoparticles: A case study of life-cycle implications from nano-enabled products. Nanotoxicology 2014; 9:760-8. [PMID: 25387251 DOI: 10.3109/17435390.2014.976602] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
It is well established that printers emit nanoparticles during their operation. To-date, however, the physicochemical and toxicological characterization of "real world" printer-emitted nanoparticles (PEPs) remains incomplete, hampering proper risk assessment efforts. Here, we investigate our earlier hypothesis that engineered nanomaterials (ENMs) are used in toners and ENMs are released during printing (consumer use). Furthermore, we conduct a detailed physicochemical and morphological characterization of PEPs in support of ongoing toxicological assessment. A comprehensive suite of state of the art analytical methods and tools was employed for the physicochemical and morphological characterization of 11 toners widely utilized in printers from major printer manufacturers and their PEPs. We confirmed that a number of ENMs incorporated into toner formulations (e.g. silica, alumina, titania, iron oxide, zinc oxide, copper oxide, cerium oxide, carbon black among others) and released into the air during printing. All evaluated toners contained large amounts of organic carbon (OC, 42-89%), metals/metal oxides (1-33%), and some elemental carbon (EC, 0.33-12%). The PEPs possess a composition similar to that of toner and contained 50-90% OC, 0.001-0.5% EC and 1-3% metals. While the chemistry of the PEPs generally reflected that of their toners, considerable differences are documented indicative of potential transformations taking place during consumer use (printing). We conclude that: (i) Routine incorporation of ENMs in toners classifies them as nano-enabled products (NEPs); (ii) These ENMs become airborne during printing; (iii) The chemistry of PEPs is complex and it reflects that of the toner and paper. This work highlights the importance of understanding life-cycle (LC) nano-EHS implications of NEPs and assessing real world exposures and associated toxicological properties rather than focusing on "raw" materials used in the synthesis of an NEP.
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Affiliation(s)
- Sandra V Pirela
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, School of Public Health, Harvard University , Boston, MA , USA
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Sisler JD, Pirela SV, Friend S, Farcas M, Schwegler-Berry D, Shvedova A, Castranova V, Demokritou P, Qian Y. Small airway epithelial cells exposure to printer-emitted engineered nanoparticles induces cellular effects on human microvascular endothelial cells in an alveolar-capillary co-culture model. Nanotoxicology 2014; 9:769-79. [PMID: 25387250 DOI: 10.3109/17435390.2014.976603] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The printer is one of the most common office equipment. Recently, it was reported that toner formulations for printing equipment constitute nano-enabled products (NEPs) and contain engineered nanomaterials (ENMs) that become airborne during printing. To date, insufficient research has been performed to understand the potential toxicological properties of printer-emitted particles (PEPs) with several studies using bulk toner particles as test particles. These studies demonstrated the ability of toner particles to cause chronic inflammation and fibrosis in animal models. However, the toxicological implications of inhalation exposures to ENMs emitted from laser printing equipment remain largely unknown. The present study investigates the toxicological effects of PEPs using an in vitro alveolar-capillary co-culture model with Human Small Airway Epithelial Cells (SAEC) and Human Microvascular Endothelial Cells (HMVEC). Our data demonstrate that direct exposure of SAEC to low concentrations of PEPs (0.5 and 1.0 µg/mL) caused morphological changes of actin remodeling and gap formations within the endothelial monolayer. Furthermore, increased production of reactive oxygen species (ROS) and angiogenesis were observed in the HMVEC. Analysis of cytokine and chemokine levels demonstrates that interleukin (IL)-6 and MCP-1 may play a major role in the cellular communication observed between SAEC and HMVEC and the resultant responses in HMVEC. These data indicate that PEPs at low, non-cytotoxic exposure levels are bioactive and affect cellular responses in an alveolar-capillary co-culture model, which raises concerns for potential adverse health effects.
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Affiliation(s)
- Jennifer D Sisler
- Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Saftey and Health , Morgantown, WV , USA
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Koivisto AJ, Palomäki JE, Viitanen AK, Siivola KM, Koponen IK, Yu M, Kanerva TS, Norppa H, Alenius HT, Hussein T, Savolainen KM, Hämeri KJ. Range-finding risk assessment of inhalation exposure to nanodiamonds in a laboratory environment. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2014; 11:5382-402. [PMID: 24840353 PMCID: PMC4053885 DOI: 10.3390/ijerph110505382] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 05/04/2014] [Accepted: 05/08/2014] [Indexed: 12/31/2022]
Abstract
This study considers fundamental methods in occupational risk assessment of exposure to airborne engineered nanomaterials. We discuss characterization of particle emissions, exposure assessment, hazard assessment with in vitro studies, and risk range characterization using calculated inhaled doses and dose-response translated to humans from in vitro studies. Here, the methods were utilized to assess workers' risk range of inhalation exposure to nanodiamonds (NDs) during handling and sieving of ND powder. NDs were agglomerated to over 500 nm particles, and mean exposure levels of different work tasks varied from 0.24 to 4.96 µg·m(-3) (0.08 to 0.74 cm(-3)). In vitro-experiments suggested that ND exposure may cause a risk for activation of inflammatory cascade. However, risk range characterization based on in vitro dose-response was not performed because accurate assessment of delivered (settled) dose on the cells was not possible. Comparison of ND exposure with common pollutants revealed that ND exposure was below 5 μg·m(-3), which is one of the proposed exposure limits for diesel particulate matter, and the workers' calculated dose of NDs during the measurement day was 74 ng which corresponded to 0.02% of the modeled daily (24 h) dose of submicrometer urban air particles.
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Affiliation(s)
- Antti J Koivisto
- Nanosafety Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 a A, FI-00250 Helsinki, Finland.
| | - Jaana E Palomäki
- Nanosafety Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 a A, FI-00250 Helsinki, Finland.
| | - Anna-Kaisa Viitanen
- Nanosafety Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 a A, FI-00250 Helsinki, Finland.
| | - Kirsi M Siivola
- Nanosafety Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 a A, FI-00250 Helsinki, Finland.
| | - Ismo K Koponen
- National Research Centre for the Working Environment, Lersø Parkallé 105, Copenhagen DK-2100, Denmark.
| | - Mingzhou Yu
- Institute of Earth Environment, Chinese Academy of Sciences, Fenghui Road, Xi'an 710075, China.
| | - Tomi S Kanerva
- Nanosafety Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 a A, FI-00250 Helsinki, Finland.
| | - Hannu Norppa
- Nanosafety Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 a A, FI-00250 Helsinki, Finland.
| | - Harri T Alenius
- Nanosafety Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 a A, FI-00250 Helsinki, Finland.
| | - Tareq Hussein
- Department of Physics, Faculty of Science, The University of Jordan, Amman JO-11942, Jordan.
| | - Kai M Savolainen
- Nanosafety Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 a A, FI-00250 Helsinki, Finland.
| | - Kaarle J Hämeri
- Department of Physics, University of Helsinki, Gustaf Hällströmin Katu 2, P.O. Box 64, Helsinki FI-00014, Finland.
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47
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Cohen JM, Teeguarden JG, Demokritou P. An integrated approach for the in vitro dosimetry of engineered nanomaterials. Part Fibre Toxicol 2014; 11:20. [PMID: 24885440 PMCID: PMC4024018 DOI: 10.1186/1743-8977-11-20] [Citation(s) in RCA: 160] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 04/24/2014] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND There is a great need for screening tools capable of rapidly assessing nanomaterial toxicity. One impediment to the development of reliable in vitro screening methods is the need for accurate measures of cellular dose. We present here a methodology that enables accurate determination of delivered to cell dose metrics. This methodology includes (1) standardization of engineered nanomaterial (ENM) suspension preparation; (2) measurement of ENM characteristics controlling delivery to cells in culture; and (3) calculation of delivered dose as a function of exposure time using the ISDD model. The approach is validated against experimentally measured doses, and simplified analytical expressions for the delivered dose (Relevant In Vitro Dose (RID)f function) are derived for 20 ENMs. These functions can be used by nanotoxicologists to accurately calculate the total mass (RIDM), surface area (RIDSA), or particle number (RIDN) delivered to cells as a function of exposure time. RESULTS The proposed methodology was used to derive the effective density, agglomerate diameter and RID functions for 17 industrially-relevant metal and metal oxide ENMs, two carbonaceous nanoparticles, and non-agglomerating gold nanospheres, for two well plate configurations (96 and 384 well plates). For agglomerating ENMs, the measured effective density was on average 60% below the material density. We report great variability in delivered dose metrics, with some materials depositing within 24 hours while others require over 100 hours for delivery to cells. A neutron-activated tracer particle system was employed to validate the proposed in vitro dosimetry methodology for a number of ENMs (measured delivered to cell dose within 9% of estimated). CONCLUSIONS Our findings confirm and extend experimental and computational evidence that agglomerate characteristics affect the dose delivered to cells. Therefore measurement of these characteristics is critical for effective use of in vitro systems for nanotoxicology. The mixed experimental/computational approach to cellular dosimetry proposed and validated here can be used by nanotoxicologists to accurately calculate the delivered to cell dose metrics for various ENMs and in vitro conditions as a function of exposure time. The RID functions and characterization data for widely used ENMs presented here can together be used by experimentalists to design and interpret toxicity studies.
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Affiliation(s)
| | | | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA.
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48
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Estimating the effective density of engineered nanomaterials for in vitro dosimetry. Nat Commun 2014; 5:3514. [PMID: 24675174 PMCID: PMC4038248 DOI: 10.1038/ncomms4514] [Citation(s) in RCA: 202] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Accepted: 02/26/2014] [Indexed: 01/18/2023] Open
Abstract
The need for accurate in vitro dosimetry remains a major obstacle to the development of cost-effective toxicological screening methods for engineered nanomaterials. An important key to accurate in vitro dosimetry is the characterization of sedimentation and diffusion rates of nanoparticles suspended in culture media, which largely depend upon the effective density and diameter of formed agglomerates in suspension. Here we present a rapid and inexpensive method for accurately measuring the effective density of nano-agglomerates in suspension. This novel method is based on the volume of the pellet obtained by bench-top centrifugation of nanomaterial suspensions in a packed cell volume tube, and is validated against gold-standard analytical ultracentrifugation data. This simple and cost-effective method allows nanotoxicologists to correctly model nanoparticle transport, and thus attain accurate dosimetry in cell culture systems, which will greatly advance the development of reliable and efficient methods for toxicological testing and investigation of nano-bio interactions in vitro.
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49
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Watson C, Ge J, Cohen J, Pyrgiotakis G, Engelward BP, Demokritou P. High-throughput screening platform for engineered nanoparticle-mediated genotoxicity using CometChip technology. ACS NANO 2014; 8:2118-33. [PMID: 24617523 PMCID: PMC3971959 DOI: 10.1021/nn404871p] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 02/16/2014] [Indexed: 05/20/2023]
Abstract
The likelihood of intentional and unintentional engineered nanoparticle (ENP) exposure has dramatically increased due to the use of nanoenabled products. Indeed, ENPs have been incorporated in many useful products and have enhanced our way of life. However, there are many unanswered questions about the consequences of nanoparticle exposures, in particular, with regard to their potential to damage the genome and thus potentially promote cancer. In this study, we present a high-throughput screening assay based upon the recently developed CometChip technology, which enables evaluation of single-stranded DNA breaks, abasic sites, and alkali-sensitive sites in cells exposed to ENPs. The strategic microfabricated, 96-well design and automated processing improves efficiency, reduces processing time, and suppresses user bias in comparison to the standard comet assay. We evaluated the versatility of this assay by screening five industrially relevant ENP exposures (SiO2, ZnO, Fe2O3, Ag, and CeO2) on both suspension human lymphoblastoid (TK6) and adherent Chinese hamster ovary (H9T3) cell lines. MTT and CyQuant NF assays were employed to assess cellular viability and proliferation after ENP exposure. Exposure to ENPs at a dose range of 5, 10, and 20 μg/mL induced dose-dependent increases in DNA damage and cytotoxicity. Genotoxicity profiles of ZnO>Ag>Fe2O3>CeO2>SiO2 in TK6 cells at 4 h and Ag>Fe2O3>ZnO>CeO2>SiO2 in H9T3 cells at 24 h were observed. The presented CometChip platform enabled efficient and reliable measurement of ENP-mediated DNA damage, therefore demonstrating the efficacy of this powerful tool in nanogenotoxicity studies.
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Affiliation(s)
- Christa Watson
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, Massachusetts 02115, United States
| | - Jing Ge
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Joel Cohen
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, Massachusetts 02115, United States
| | - Georgios Pyrgiotakis
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, Massachusetts 02115, United States
| | - Bevin P. Engelward
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Address correspondence to ,
| | - Philip Demokritou
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health, Boston, Massachusetts 02115, United States
- Address correspondence to ,
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50
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Cohen JM, Derk R, Wang L, Godleski J, Kobzik L, Brain J, Demokritou P. Tracking translocation of industrially relevant engineered nanomaterials (ENMs) across alveolar epithelial monolayers in vitro. Nanotoxicology 2014; 8 Suppl 1:216-25. [PMID: 24479615 DOI: 10.3109/17435390.2013.879612] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract Relatively little is known about the fate of industrially relevant engineered nanomaterials (ENMs) in the lungs that can be used to convert administered doses to delivered doses. Inhalation exposure and subsequent translocation of ENMs across the epithelial lining layer of the lung might contribute to clearance, toxic effects or both. To allow precise quantitation of translocation across lung epithelial cells, we developed a method for tracking industrially relevant metal oxide ENMs in vitro using neutron activation. The versatility and sensitivity of the proposed in vitro epithelial translocation (INVET) system was demonstrated using a variety of industry relevant ENMs including CeO2 of various primary particle diameter, ZnO, and SiO2-coated CeO2 and ZnO particles. ENMs were neutron activated, forming gamma emitting isotopes (141)Ce and (65)Zn, respectively. Calu-3 lung epithelial cells cultured to confluency on transwell inserts were exposed to neutron-activated ENM dispersions at sub-lethal doses to investigate the link between ENM properties and translocation potential. The effects of ENM exposure on monolayer integrity was monitored by various methods. ENM translocation across the cellular monolayer was assessed by gamma spectrometry following 2, 4 and 24 h of exposure. Our results demonstrate that ENMs translocated in small amounts (e.g. <0.01% of the delivered dose at 24 h), predominantly via transcellular pathways without compromising monolayer integrity or disrupting tight junctions. It was also demonstrated that the delivery of particles in suspension to cells in culture is proportional to translocation, emphasizing the importance of accurate dosimetry when comparing ENM-cellular interactions for large panels of materials. The reported INVET system for tracking industrially relevant ENMs while accounting for dosimetry can be a valuable tool for investigating nano-bio interactions in the future.
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Affiliation(s)
- Joel M Cohen
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard School of Public Health , Boston, MA , USA and
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