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Yamashita Y, Tokunaga A, Aoki K, Ishizuka T, Uematsu H, Sakamoto H, Fujita S, Tanoue S. Assessing the Safety of Mechanically Fibrillated Cellulose Nanofibers (fib-CNF) via Toxicity Tests on Mice: Single Intratracheal Administration and 28 Days' Oral Intake. TOXICS 2024; 12:121. [PMID: 38393216 PMCID: PMC10893282 DOI: 10.3390/toxics12020121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/07/2024] [Accepted: 01/15/2024] [Indexed: 02/25/2024]
Abstract
Mechanically fibrillated cellulose nanofibers, known as fib-CNF (fiber length: 500 nm; diameter: 45 nm), are used in composites and as a natural thickener in foods. To evaluate their safety, we conducted a 28-day study in mice with inhalation exposure at 0.2 mg/body and oral administration of 400 mg/kg/day. Inhalation exposure to fib-CNF caused transient weight loss, changes in blood cell counts, and increased lung weights. These changes were attributed to adaptive responses. The oral administration of fib-CNF for 28 days resulted in no apparent toxic effects except for a slight decrease in platelet counts. The fib-CNF administration using the protocols studied appears to be safe in mice.
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Affiliation(s)
- Yoshihiro Yamashita
- Research Center for Fibers and Materials, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan;
| | - Akinori Tokunaga
- Life Science Research Laboratory, University of Fukui, 23-3, Matsuoka Shimoaizuki, Eiheiji-cho, Fukui 910-1193, Japan;
- Organization for Life Science Advancement Programs, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan; (K.A.); (T.I.); (H.U.); (H.S.); (S.F.)
| | - Koji Aoki
- Organization for Life Science Advancement Programs, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan; (K.A.); (T.I.); (H.U.); (H.S.); (S.F.)
- Department of Pharmacology, Faculty of Medicine, University of Fukui, 23-3, Matsuoka Shimoaizuki, Eiheiji-cho, Fukui 910-1193, Japan
| | - Tamotsu Ishizuka
- Organization for Life Science Advancement Programs, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan; (K.A.); (T.I.); (H.U.); (H.S.); (S.F.)
- Third Department of Internal Medicine, Faculty of Medicine, University of Fukui, 23-3, Matsuoka Shimoaizuki, Eiheiji-cho, Fukui 910-1193, Japan
| | - Hideyuki Uematsu
- Organization for Life Science Advancement Programs, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan; (K.A.); (T.I.); (H.U.); (H.S.); (S.F.)
- Department of Frontier Fiber Technology and Science, Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Hiroaki Sakamoto
- Organization for Life Science Advancement Programs, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan; (K.A.); (T.I.); (H.U.); (H.S.); (S.F.)
- Department of Frontier Fiber Technology and Science, Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Satoshi Fujita
- Organization for Life Science Advancement Programs, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan; (K.A.); (T.I.); (H.U.); (H.S.); (S.F.)
- Department of Frontier Fiber Technology and Science, Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Shuichi Tanoue
- Research Center for Fibers and Materials, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan;
- Organization for Life Science Advancement Programs, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan; (K.A.); (T.I.); (H.U.); (H.S.); (S.F.)
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Kauschke V, Philipp-Gehlhaar M, Schneider J. Expression of microRNAs in leukocytes and serum of asbestosis patients. Eur J Med Res 2023; 28:175. [PMID: 37189132 PMCID: PMC10184414 DOI: 10.1186/s40001-023-01129-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 04/26/2023] [Indexed: 05/17/2023] Open
Abstract
BACKGROUND Although asbestos use is banned in many countries, long latency of asbestos-related diseases like pleural plaques or asbestosis mean it is still a public health issue. People suffering from these diseases have a higher risk of developing mesothelioma or lung cancer, which can progress quickly and aggressively. MicroRNAs were suggested as potential biomarkers in several diseases. However, in asbestosis, blood microRNAs are less explored. Since miR-32-5p, miR-143-3p, miR-145-5p, miR-146b-5p, miR-204-5p and miR-451a are involved in fibrotic processes and in cancer, expression of these microRNAs was analyzed in leukocytes and serum of asbestosis patients. METHODS MicroRNA expression was analyzed in leukocytes and serum of 36 patients (26 affected by pleural plaques and 10 by asbestosis) and 15 healthy controls by real-time RT-PCR. Additionally, data analyses were performed regarding disease severity based on ILO classification. RESULTS MicroRNA miR-146b-5p was significantly down-regulated in leukocytes of patients suffering from pleural plaques with a large effect indicated by η2p = 0.150 and Cohen's f = 0.42, a value of difference of 0.725 and a 95% confidence interval of 0.070-1.381. In patients suffering from asbestosis miR-146b-5p was not significantly regulated. However, data analyses considering disease severity only, revealed that miR-146b-5p was significantly down-regulated in leukocytes of mildly diseased patients compared to controls with a large effect indicated by η2p = 0.178 and Cohen's f = 0.465, a value of difference of 0.848 and a 95% confidence interval of 0.097-1.599. Receiver operating characteristic (ROC) curve and an area under the ROC curve value of 0.757 for miR-146b-5p indicated acceptable discrimination ability between patients suffering from pleural plaques and healthy controls. Less microRNAs were detectable in serum than in leukocytes, showing no significant expression differences in all participants of this study. Moreover, miR-145-5p was regulated significantly differently in leukocytes and serum. An R2 value of 0.004 for miR-145-5p indicated no correlation in microRNA expression between leukocytes and serum. CONCLUSION Leukocytes seem more suitable than serum for microRNA analyses regarding disease and potentially cancer risk assessment of patients suffering from asbestos-related pleural plaques or asbestosis. Long-term studies may reveal whether down-regulation of miR-146b-5p in leukocytes might be an early indicator for an increased cancer risk.
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Affiliation(s)
- Vivien Kauschke
- Institute and Outpatient Clinic of Occupational and Social Medicine, University Hospital of Giessen and Marburg, Aulweg 129, 35392, Giessen, Germany.
| | - Monika Philipp-Gehlhaar
- Institute and Outpatient Clinic of Occupational and Social Medicine, University Hospital of Giessen and Marburg, Aulweg 129, 35392, Giessen, Germany
| | - Joachim Schneider
- Institute and Outpatient Clinic of Occupational and Social Medicine, University Hospital of Giessen and Marburg, Aulweg 129, 35392, Giessen, Germany
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Zhu Y, Tang Q, Cao W, Zhou N, Jin X, Song Z, Zu L, Xu S. Identification of a novel oxidative stress-related prognostic model in lung adenocarcinoma. Front Pharmacol 2022; 13:1030062. [PMID: 36467027 PMCID: PMC9715759 DOI: 10.3389/fphar.2022.1030062] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Accepted: 11/08/2022] [Indexed: 03/23/2024] Open
Abstract
Background: Oxidative stress (OxS) participates in a variety of biological processes, and is considered to be related to the occurrence and progression of many tumors; however, the potential diagnostic value of OxS in lung cancer remains unclear. Methods: The clinicopathological and transcriptome data for lung adenocarcinoma (LUAD) were collected from TCGA and GEO database. LASSO regression was used to construct a prognostic risk model. The prognostic significance of the OxS-related genes was explored using a Kaplan-Meier plotter database. The prediction performance of the risk model was shown in both the TCGA and GSE68465 cohorts. The qRT-PCR was performed to explore the expression of genes. CCK-8, Edu and transwell assays were conducted to analyze the role of CAT on cell proliferation migration and invasion in lung cancer. Immune infiltration was evaluated by CIBERSORT and mutational landscape was displayed in the TCGA database. Moreover, the relationship between risk score with drug sensitivity was investigated by pRRophetic. Results: We identified a prognosis related risk model based on a four OxS gene signature in LUAD, including CYP2D6, FM O 3, CAT, and GAPDH. The survival analysis and ROC curve indicated good predictive power of the model in both the TCGA and GEO cohorts. LUAD patients in the high-risk group had a shorter OS compared to the low-risk group. QRT-PCR result showed that the expression of four genes was consistent with previous analysis in cell lines. Moreover, overexpression of CAT could decrease the proliferation, invasion and migration of lung cancer cells. The Cox regression analysis showed that the risk score could be used as an independent prognostic factor for OS. LUAD patients in the high-risk score group exhibited a higher tumor mutation burden and risk score were closely related to tumor associated immune cell infiltration, as well as the expression of immune checkpoint molecules. Both the high- and low-risk groups have significant differences in sensitivity to some common chemotherapy drugs, such as Paclitaxel, Docetaxel, and Vinblastine, which may contribute to clinical treatment decisions. Conclusion: We established a robust OxS-related prognostic model, which may contribute to individualized immunotherapeutic strategies in LUAD.
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Affiliation(s)
- Yifan Zhu
- Department of Lung Cancer Surgery, Tianjin, China
- Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Quanying Tang
- Department of Lung Cancer Surgery, Tianjin, China
- Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Weibo Cao
- Department of Lung Cancer Surgery, Tianjin, China
- Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Ning Zhou
- Department of Lung Cancer Surgery, Tianjin, China
- Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Xin Jin
- Department of Lung Cancer Surgery, Tianjin, China
- Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Zuoqing Song
- Department of Lung Cancer Surgery, Tianjin, China
- Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Lingling Zu
- Department of Lung Cancer Surgery, Tianjin, China
- Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Song Xu
- Department of Lung Cancer Surgery, Tianjin, China
- Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin, China
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Pandey SK, Machlof-Cohen R, Santhanam M, Shteinfer-Kuzmine A, Shoshan-Barmatz V. Silencing VDAC1 to Treat Mesothelioma Cancer: Tumor Reprograming and Altering Tumor Hallmarks. Biomolecules 2022; 12:biom12070895. [PMID: 35883451 PMCID: PMC9312978 DOI: 10.3390/biom12070895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 06/20/2022] [Accepted: 06/24/2022] [Indexed: 12/10/2022] Open
Abstract
Mesothelioma, an aggressive cancer with a poor prognosis, is linked to asbestos exposure. However, carbon nanotubes found in materials we are exposed to daily can cause mesothelioma cancer. Cancer cells reprogram their metabolism to support increased biosynthetic and energy demands required for their growth and motility. Here, we examined the effects of silencing the expression of the voltage-dependent anion channel 1 (VDAC1), controlling the metabolic and energetic crosstalk between mitochondria and the rest of the cell. We demonstrate that VDAC1 is overexpressed in mesothelioma patients; its levels increase with disease stage and are associated with low survival rates. Silencing VDAC1 expression using a specific siRNA identifying both mouse and human VDAC1 (si-m/hVDAC1-B) inhibits cell proliferation of mesothelioma cancer cells. Treatment of xenografts of human-derived H226 cells or mouse-derived AB1 cells with si-m/hVDAC1-B inhibited tumor growth and caused metabolism reprogramming, as reflected in the decreased expression of metabolism-related proteins, including glycolytic and tricarboxylic acid (-)cycle enzymes and the ATP-synthesizing enzyme. In addition, tumors depleted of VDAC1 showed altered microenvironments and inflammation, both associated with cancer progression. Finally, tumor VDAC1 silencing also eliminated cancer stem cells and induced cell differentiation to normal-like cells. The results show that silencing VDAC1 expression leads to reprogrammed metabolism and to multiple effects from tumor growth inhibition to modulation of the tumor microenvironment and inflammation, inducing differentiation of malignant cells. Thus, silencing VDAC1 is a potential therapeutic approach to treating mesothelioma.
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Affiliation(s)
- Swaroop Kumar Pandey
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; (S.K.P.); (R.M.-C.); (M.S.)
- The National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;
| | - Renen Machlof-Cohen
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; (S.K.P.); (R.M.-C.); (M.S.)
| | - Manikandan Santhanam
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; (S.K.P.); (R.M.-C.); (M.S.)
- The National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;
| | - Anna Shteinfer-Kuzmine
- The National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;
| | - Varda Shoshan-Barmatz
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; (S.K.P.); (R.M.-C.); (M.S.)
- The National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;
- Correspondence: ; Tel.: +972-528795939; Fax: +972-86479207
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Gupta SS, Singh KP, Gupta S, Dusinska M, Rahman Q. Do Carbon Nanotubes and Asbestos Fibers Exhibit Common Toxicity Mechanisms? NANOMATERIALS 2022; 12:nano12101708. [PMID: 35630938 PMCID: PMC9145953 DOI: 10.3390/nano12101708] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 05/05/2022] [Accepted: 05/06/2022] [Indexed: 01/27/2023]
Abstract
During the last two decades several nanoscale materials were engineered for industrial and medical applications. Among them carbon nanotubes (CNTs) are the most exploited nanomaterials with global production of around 1000 tons/year. Besides several commercial benefits of CNTs, the fiber-like structures and their bio-persistency in lung tissues raise serious concerns about the possible adverse human health effects resembling those of asbestos fibers. In this review, we present a comparative analysis between CNTs and asbestos fibers using the following four parameters: (1) fibrous needle-like shape, (2) bio-persistent nature, (3) high surface to volume ratio and (4) capacity to adsorb toxicants/pollutants on the surface. We also compare mechanisms underlying the toxicity caused by certain diameters and lengths of CNTs and asbestos fibers using downstream pathways associated with altered gene expression data from both asbestos and CNT exposure. Our results suggest that indeed certain types of CNTs are emulating asbestos fiber as far as associated toxicity is concerned.
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Affiliation(s)
- Suchi Smita Gupta
- Department of Systems Biology and Bioinformatics, University of Rostock, 18051 Rostock, Germany; (S.S.G.); (K.P.S.); (S.G.)
| | - Krishna P. Singh
- Department of Systems Biology and Bioinformatics, University of Rostock, 18051 Rostock, Germany; (S.S.G.); (K.P.S.); (S.G.)
| | - Shailendra Gupta
- Department of Systems Biology and Bioinformatics, University of Rostock, 18051 Rostock, Germany; (S.S.G.); (K.P.S.); (S.G.)
| | - Maria Dusinska
- Health Effects Laboratory, Department of Environmental Chemistry, NILU-Norwegian Institute for Air Research, 2007 Kjeller, Norway;
| | - Qamar Rahman
- Amity Institute of Biotechnology, Amity University, Lucknow 226028, India
- Correspondence:
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6
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Taucher E, Mykoliuk I, Lindenmann J, Smolle-Juettner FM. Implications of the Immune Landscape in COPD and Lung Cancer: Smoking Versus Other Causes. Front Immunol 2022; 13:846605. [PMID: 35386685 PMCID: PMC8978964 DOI: 10.3389/fimmu.2022.846605] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 02/28/2022] [Indexed: 12/30/2022] Open
Abstract
Cigarette smoking is reported in about one third of adults worldwide. A strong relationship between cigarette smoke exposure and chronic obstructive pulmonary disease (COPD) as well as lung cancer has been proven. However, about 15% of lung cancer cases, and between one fourth and one third of COPD cases, occur in never-smokers. The effects of cigarette smoke on the innate as well as the adaptive immune system have been widely investigated. It is assumed that certain immunologic features contribute to lung cancer and COPD development in the absence of smoking as the major risk factor. In this article, we review different immunological aspects of lung cancer and COPD with a special focus on non-smoking related risk factors.
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Affiliation(s)
- Elisabeth Taucher
- Division of Pulmonology, Department of Internal Medicine, Medical University Graz, Graz, Austria
| | - Iurii Mykoliuk
- Division of Thoracic Surgery, Department of Surgery, Medical University Graz, Graz, Austria
| | - Joerg Lindenmann
- Division of Thoracic Surgery, Department of Surgery, Medical University Graz, Graz, Austria
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Yue L, Luo Y, Jiang L, Sekido Y, Toyokuni S. PCBP2 knockdown promotes ferroptosis in malignant mesothelioma. Pathol Int 2022; 72:242-251. [PMID: 35089637 DOI: 10.1111/pin.13209] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 01/07/2022] [Indexed: 12/17/2022]
Abstract
Malignant mesothelioma (MM) is still increasing worldwide. The pathogenesis depends on asbestos-induced iron accumulation, which eventually leads to ferroptosis-resistance of mesothelial cells via somatic mutations. Poly (rC)-binding proteins 1 and 2 (PCBP1/2) are recently recognized cytosolic Fe(II) chaperones. Here we studied the role of PCBP1/2 in rat/human mesothelial and MM cells as well as rat/human MM specimens. Normal peritoneal mesothelial cells in rats exhibited PCBP1 but not PCBP2 immunopositivity whereas primary/immortalized mesothelial cells showed PCBP1/2 immunopositivity. Rat MM specimens induced by intraperitoneal injection of chrysotile, including in situ lesion, revealed PCBP1/2 immunopositivity (90% for both) in the nucleus and cytoplasm with a tendency of higher expression in epithelioid subtype. Knockdown of PCBP2 but not PCBP1 significantly decreased both TfR1 and FTH expression in MM cells with inhibition of proliferation, indicating stagnation of intracellular iron transport. Erastin, a cysteine-deprivation type ferroptosis inducer, decreased the expression of both PCBP1/2 in MM cells. Furthermore, PCBP2 knockdown significantly increased the sensitivity of MM cells to erastin-induced ferroptosis with increased catalytic Fe(II). In conclusion, PCBP2 works for ferroptosis-resistance not only during mesothelial carcinogenesis but also in MM, which warrants further investigation as a novel therapeutic target.
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Affiliation(s)
- Lin Yue
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yaguang Luo
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Li Jiang
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yoshitaka Sekido
- Division of Cancer Biology, Aichi Cancer Center Research Institute, 1-1 Kanokoden, Chikusa-ku, Nagoya, Japan
| | - Shinya Toyokuni
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan.,Center for Low-temperature Plasma Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
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8
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Zhang H, Wan LQ. Cell Chirality as a Novel Measure for Cytotoxicity. Adv Biol (Weinh) 2022; 6:e2101088. [PMID: 34796704 PMCID: PMC9008805 DOI: 10.1002/adbi.202101088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/28/2021] [Indexed: 12/25/2022]
Abstract
Cytotoxicity assessment has great importance in both research and pharmaceutical development. The mainstream in vitro cytotoxicity assays are mostly biochemical assays that evaluate a specific cellular activity such as proliferation and apoptosis. Few assays assess toxicity by characterizing overall functional outcomes in cellular physiology such as multicellular morphogenesis. The intrinsic cellular chiral bias (also known as cell chirality, left-right asymmetry, or handedness), which determines cellular polarization along the left-right axis, is demonstrated to play important roles in development and disease. This chiral property of cells gives insights not only into functions of individual cells, such as motility and polarity but also into emerging behaviors of cell clusters, such as collective cell migration. Therefore, cell chirality characterization can be potentially used as a biomarker for assessing the overall effects of pharmaceutical drugs and environmental factors on the health of the cell. In this review article, the current in vitro techniques for cell chirality characterization and their applications are discussed and the advantages and limitations of these cell chirality assays as potential tools for detecting cytotoxicity are discussed.
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Affiliation(s)
- Haokang Zhang
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Leo Q Wan
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
- Center for Modeling, Simulation, and Imaging in Medicine, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
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Liu X, Mubarik S, Wang F, Yu Y, Wang Y, Shi F, Wen H, Yu C. Lung Cancer Death Attributable to Long-Term Ambient Particulate Matter (PM 2.5) Exposure in East Asian Countries During 1990-2019. Front Med (Lausanne) 2021; 8:742076. [PMID: 34722581 PMCID: PMC8553966 DOI: 10.3389/fmed.2021.742076] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 09/20/2021] [Indexed: 12/29/2022] Open
Abstract
Background: Ambient particulate matter is a public health concern in East Asia as it contributes to a growing number of all-cause and cancer deaths. This study aimed to estimate lung cancer death attributable to ambient particulate matter (PM) < 2.5 μm (PM2.5) in East Asia countries. Methods: The attributable death rates of lung cancer were estimated based on the calculation of population attributable fraction. We performed joinpoint regression analysis and age-period-cohort (APC) model to estimate temporal trends of the attributable death to PM2.5. Results: In 2019, PM2.5 was estimated to have caused 42.2% (nearly 0.13 million) of lung cancer deaths in East Asia men. During 1990–2019, the increase in age-standardized death rates of lung cancer attributable to PM2.5 was highest in China, which increased by 3.50% in males and 3.71% in females. The death rate caused by PM2.5 also significantly increased in the Democratic People's Republic of Korea (2.16% in males; 3.06% in females). Joinpoint analysis showed that the rates generally increased in younger and older people in both the Democratic People's Republic of Korea and Mongolia, while it only increased in elderly people in other countries'. Age effect from APC analysis demonstrated the risk of lung cancer death attributable to PM2.5 generally increased from young to old age. Period effect indicated that from 1994–1998 to 2019–2023 period risk continuously increased by 1.77, 1.68, and 1.72 times in China, the Democratic People's Republic of Korea, and Japan, respectively. The period risk decreased from 1999 to 2009 and subsequently increased from 2009 to 2019 in both the Republic of Korea and Mongolia. Conclusions: The death rate of lung cancer attributable to PM2.5 is increasing in the Democratic People's Republic of Korea, Mongolia, and China. In East Asia, China is facing the highest attributable death rate in recent decades. The period effect suggested a remarkably increased risk of lung cancer death caused by PM2.5 in China, the Democratic People's Republic of Korea, and Japan during the long-term period. It is recommended that the governments of these countries should continuously concentrate on particulate matter pollution governance and improvement.
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Affiliation(s)
- Xiaoxue Liu
- Department of Epidemiology and Biostatistics, School of Public Health, Wuhan University, Wuhan, China
| | - Sumaira Mubarik
- Department of Epidemiology and Biostatistics, School of Public Health, Wuhan University, Wuhan, China
| | - Fang Wang
- Department of Epidemiology and Biostatistics, School of Public Health, Wuhan University, Wuhan, China
| | - Yong Yu
- School of Public Health and Management, University of Medicine, Shiyan, China
| | - Yafeng Wang
- Department of Epidemiology and Biostatistics, School of Public Health, Wuhan University, Wuhan, China
| | - Fang Shi
- Department of Epidemiology and Biostatistics, School of Public Health, Wuhan University, Wuhan, China
| | - Haoyu Wen
- Department of Epidemiology and Biostatistics, School of Public Health, Wuhan University, Wuhan, China
| | - Chuanhua Yu
- Department of Epidemiology and Biostatistics, School of Public Health, Wuhan University, Wuhan, China.,Global Health Institute, Wuhan University, Wuhan, China
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10
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Kladko DV, Falchevskaya AS, Serov NS, Prilepskii AY. Nanomaterial Shape Influence on Cell Behavior. Int J Mol Sci 2021; 22:5266. [PMID: 34067696 PMCID: PMC8156540 DOI: 10.3390/ijms22105266] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 05/13/2021] [Accepted: 05/14/2021] [Indexed: 12/18/2022] Open
Abstract
Nanomaterials are proven to affect the biological activity of mammalian and microbial cells profoundly. Despite this fact, only surface chemistry, charge, and area are often linked to these phenomena. Moreover, most attention in this field is directed exclusively at nanomaterial cytotoxicity. At the same time, there is a large body of studies showing the influence of nanomaterials on cellular metabolism, proliferation, differentiation, reprogramming, gene transfer, and many other processes. Furthermore, it has been revealed that in all these cases, the shape of the nanomaterial plays a crucial role. In this paper, the mechanisms of nanomaterials shape control, approaches toward its synthesis, and the influence of nanomaterial shape on various biological activities of mammalian and microbial cells, such as proliferation, differentiation, and metabolism, as well as the prospects of this emerging field, are reviewed.
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Affiliation(s)
| | | | | | - Artur Y. Prilepskii
- International Institute “Solution Chemistry of Advanced Materials and Technologies”, ITMO University, 191002 Saint Petersburg, Russia; (D.V.K.); (A.S.F.); (N.S.S.)
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Carcinogenesis as Side Effects of Iron and Oxygen Utilization: From the Unveiled Truth toward Ultimate Bioengineering. Cancers (Basel) 2020; 12:cancers12113320. [PMID: 33182727 PMCID: PMC7698037 DOI: 10.3390/cancers12113320] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 11/06/2020] [Accepted: 11/09/2020] [Indexed: 12/27/2022] Open
Abstract
Simple Summary Cancer is a major cause of human mortality worldwide. No life on earth can live without iron. Persistent oxidative stress resulting from continuous use of iron and oxygen may be a fundamental cause of carcinogenesis. Many animal models demonstrated that excess iron may lead to carcinogenesis. This is supported by a variety of human epidemiological data on cancer risk and prognosis. Cancer is basically a disease of the genome with persistently activated oncogenes and inactivated tumor suppressor genes through which iron addiction with ferroptosis-resistance is established. We predict that fine use of nanomaterials and non-thermal plasma may be able to reverse this situation. Abstract Evolution from the first life on earth to humans took ~3.8 billion years. During the time there have been countless struggles among the species. Mycobacterium tuberculosis was the last major uncontrollable species against the human public health worldwide. After the victory with antibiotics, cancer has become the leading cause of death since 1981 in Japan. Considering that life inevitably depends on ceaseless electron transfers through iron and oxygen, we believe that carcinogenesis is intrinsically unavoidable side effects of using iron and oxygen. Many animal models unequivocally revealed that excess iron is a risk for carcinogenesis. This is supported by a variety of human epidemiological data on cancer risk and prognosis. Cancer is basically a disease of the genome with persistently activated oncogenes and inactivated tumor suppressor genes through which iron addiction with ferroptosis-resistance is maintained. Engineering has made a great advance in the past 50 years. In particular, nanotechnology is distinct in that the size of the engineered molecules is similar to that of our biomolecules. While some nano-molecules are found carcinogenic, there are principles to avoid such carcinogenicity with a smart possibility to use nano-molecules to specifically kill cancer cells. Non-thermal plasma is another modality to fight against cancer.
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12
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Ohara Y, Enomoto A, Tsuyuki Y, Sato K, Iida T, Kobayashi H, Mizutani Y, Miyai Y, Hara A, Mii S, Suzuki J, Yamashita K, Ito F, Motooka Y, Misawa N, Fukui T, Kawaguchi K, Yokoi K, Toyokuni S. Connective tissue growth factor produced by cancer‑associated fibroblasts correlates with poor prognosis in epithelioid malignant pleural mesothelioma. Oncol Rep 2020; 44:838-848. [PMID: 32705221 PMCID: PMC7388423 DOI: 10.3892/or.2020.7669] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 04/29/2020] [Indexed: 02/06/2023] Open
Abstract
Malignant mesothelioma is an aggressive neoplasm for which effective treatments are lacking. We often encounter mesothelioma cases with a profound desmoplastic reaction, suggesting the involvement of cancer-associated fibroblasts (CAFs) in mesothelioma progression. While the roles of CAFs have been extensively studied in other tumors and have led to the view that the cancer stroma contains heterogeneous populations of CAFs, their roles in mesothelioma remain unknown. We previously showed that connective tissue growth factor (CTGF), a secreted protein, is produced by both mesothelioma cells and fibroblasts and promotes the invasion of mesothelioma cells in vitro. In this study, we examined the clinical relevance of CAFs in mesothelioma. Using surgical specimens of epithelioid malignant pleural mesothelioma, we evaluated the clinicopathological significance of the expression of α-smooth muscle actin (αSMA), the most widely used marker of CAFs, the expression of CTGF, and the extent of fibrosis by immunohistochemistry and Elastica-Masson staining. We also analyzed the expression of mesenchymal stromal cell- and fibroblast-expressing Linx paralogue (Meflin; ISLR), a recently reported CAF marker that labels cancer-restraining CAFs and differ from αSMA-positive CAFs, by in situ hybridization. The extent of fibrosis and CTGF expression in mesothelioma cells did not correlate with patient prognosis. However, the expression of αSMA and CTGF, but not Meflin, in CAFs correlated with poor prognosis. The data suggest that CTGF+ CAFs are involved in mesothelioma progression and represent a potential molecular target for mesothelioma therapy.
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Affiliation(s)
- Yuuki Ohara
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Atsushi Enomoto
- Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Yuta Tsuyuki
- Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Kotaro Sato
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Tadashi Iida
- Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Hiroki Kobayashi
- Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Yasuyuki Mizutani
- Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Yuki Miyai
- Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Akitoshi Hara
- Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Shinji Mii
- Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Jun Suzuki
- Division of Pathology and Molecular Diagnosis, National Cancer Center Hospital East, Kashiwa 277‑8577, Japan
| | - Kyoko Yamashita
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Fumiya Ito
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Yashiro Motooka
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Nobuaki Misawa
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Takayuki Fukui
- Department of Thoracic Surgery, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Koji Kawaguchi
- Department of Thoracic Surgery, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Kohei Yokoi
- Department of Thoracic Surgery, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
| | - Shinya Toyokuni
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466‑8550, Japan
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13
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Rouka E, Beltsios E, Goundaroulis D, Vavougios GD, Solenov EI, Hatzoglou C, Gourgoulianis KI, Zarogiannis SG. In Silico Transcriptomic Analysis of Wound-Healing-Associated Genes in Malignant Pleural Mesothelioma. ACTA ACUST UNITED AC 2019; 55:medicina55060267. [PMID: 31212858 PMCID: PMC6631992 DOI: 10.3390/medicina55060267] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 06/08/2019] [Accepted: 06/11/2019] [Indexed: 02/06/2023]
Abstract
Background and objectives: Malignant pleural mesothelioma (MPM) is a devastating malignancy with poor prognosis. Reliable biomarkers for MPM diagnosis, monitoring, and prognosis are needed. The aim of this study was to identify genes associated with wound healing processes whose expression could serve as a prognostic factor in MPM patients. Materials and Methods: We used data mining techniques and transcriptomic analysis so as to assess the differential transcriptional expression of wound-healing-associated genes in MPM. Moreover, we investigated the potential prognostic value as well as the functional enrichments of gene ontologies relative to microRNAs (miRNAs) of the significantly differentially expressed wound-healing-related genes in MPM. Results: Out of the 82 wound-healing-associated genes analyzed, 30 were found significantly deregulated in MPM. Kaplan–Meier analysis revealed that low ITGAV gene expression could serve as a prognostic factor favoring survival of MPM patients. Finally, gene ontology annotation enrichment analysis pointed to the members of the hsa-miR-143, hsa-miR-223, and the hsa-miR-29 miRNA family members as important regulators of the deregulated wound healing genes. Conclusions: 30 wound-healing-related genes were significantly deregulated in MPM, which are potential targets of hsa-miR-143, hsa-miR-223, and the hsa-miR-29 miRNA family members. Out of those genes, ITGAV gene expression was a prognostic factor of overall survival in MPM. Our results highlight the role of impaired tissue repair in MPM development and should be further validated experimentally.
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Affiliation(s)
- Erasmia Rouka
- Department of Transfusion Medicine, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41500 Larissa, Greece.
- Department of Physiology, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41500 Larissa, Greece.
| | - Eleftherios Beltsios
- Department of Physiology, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41500 Larissa, Greece.
| | - Dimos Goundaroulis
- Center for Integrative Genomics, University of Lausanne, 1015 Lausanne, Switzerland.
- Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland.
| | | | - Evgeniy I Solenov
- Institute of Cytology and Genetics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia.
- Novosibirsk State University, Novosibirsk 630090, Russia.
| | - Chrissi Hatzoglou
- Department of Physiology, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41500 Larissa, Greece.
- Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41500 Larissa, Greece.
| | - Konstantinos I Gourgoulianis
- Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41500 Larissa, Greece.
| | - Sotirios G Zarogiannis
- Department of Physiology, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41500 Larissa, Greece.
- Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, BIOPOLIS, 41500 Larissa, Greece.
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Ito F, Hisashi H, Toyokuni S. Polymer coating on carbon nanotubes into Durobeads is a novel strategy for human environmental safety. NAGOYA JOURNAL OF MEDICAL SCIENCE 2018; 80:597-604. [PMID: 30587874 PMCID: PMC6295439 DOI: 10.18999/nagjms.80.4.597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Carbon nanotubes (CNTs) have attracted much business interest in industrial applications due to their high electrical and heat conductivities while being both durable and versatile. However, multiwall CNTs (MWCNTs) of ~50 nm diameter (NT50) have been shown to cause mesothelioma in rodents after direct exposure to mesothelial cells, and thus were classified as a Group 2B carcinogen to humans, which requires considerable regulations for use. In contrast, tangled MWCNTs of ~15 nm diameter (NTtngl) are not carcinogenic to rats, indicating that the physical dimension linked with mesothelial cellular uptake is an important factor for human environmental risk. In the present study, hypothesizing that dustability is another distinct risk factor, for the first time, we evaluated the toxicity of CNT granules (Durobeads) that were generated with a polymer coating to mesothelial cells. Polymer coating induced prominent agglomeration and significantly suppressed the dustability of CNTs in a dose-dependent manner, with a 10% polymer coating resulting in 730 times less dustability. These CNT granules revealed significantly lower mesothelial uptake and cytotoxicity in comparison to NT50 in in vitro assays. Similarly, in in vivo analyses, CNT granules induced limited peritoneal inflammation 4 weeks after intraperitoneal injection, whereas NT50 caused severe fibrosing inflammation. Previously, we demonstrated that the severity of inflammation by intraperitoneal injection in the subacute studies are in agreement with the mesothelial carcinogenicity by CNTs. Therefore, we suggest that adding a polymer coating to CNTs provides another smart strategy for the safe use of CNTs.
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Affiliation(s)
- Fumiya Ito
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 46, Japan
| | - Hideyuki Hisashi
- Mitsubishi Corporation, 3-1 Marunouchi 2-chome, Chiyoda-ku, Tokyo, Japan
| | - Shinya Toyokuni
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 46, Japan
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15
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Kane AB, Hurt RH, Gao H. The asbestos-carbon nanotube analogy: An update. Toxicol Appl Pharmacol 2018; 361:68-80. [PMID: 29960000 PMCID: PMC6298811 DOI: 10.1016/j.taap.2018.06.027] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 06/11/2018] [Accepted: 06/26/2018] [Indexed: 01/16/2023]
Abstract
Nanotechnology is an emerging industry based on commercialization of materials with one or more dimensions of 100 nm or less. Engineered nanomaterials are currently incorporated into thin films, porous materials, liquid suspensions, or filler/matrix nanocomposites with future applications predicted in energy and catalysis, microelectronics, environmental sensing and remediation, and nanomedicine. Carbon nanotubes are one-dimensional fibrous nanomaterials that physically resemble asbestos fibers. Toxicologic studies in rodents demonstrated that some types of carbon nanotubes can induce mesothelioma, and the World Health Organization evaluated long, rigid multiwall carbon nanotubes as possibly carcinogenic for humans in 2014. This review summarizes key physicochemical similarities and differences between asbestos fibers and carbon nanotubes. The "fiber pathogenicity paradigm" has been extended to include carbon nanotubes as well as other high-aspect-ratio fibrous nanomaterials including metallic nanowires. This paradigm identifies width, length, and biopersistence of high-aspect-ratio fibrous nanomaterials as critical determinants of lung disease, including mesothelioma, following inhalation. Based on recent theoretical modeling studies, a fourth factor, mechanical bending stiffness, will be considered as predictive of potential carcinogenicity. Novel three-dimensional lung tissue platforms provide an opportunity for in vitro screening of a wide range of high aspect ratio fibrous nanomaterials for potential lung toxicity prior to commercialization.
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Affiliation(s)
- Agnes B Kane
- Department of Pathology and Laboratory Medicine, Brown University, Providence, RI, United States; Institute for Molecular and Nanoscale Innovation, Providence, RI, United States.
| | - Robert H Hurt
- School of Engineering, Brown University, Providence, RI, United States; Institute for Molecular and Nanoscale Innovation, Providence, RI, United States
| | - Huajian Gao
- School of Engineering, Brown University, Providence, RI, United States; Institute for Molecular and Nanoscale Innovation, Providence, RI, United States
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16
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Gray EP, Browning CL, Wang M, Gion KD, Chao EY, Koski KJ, Kane AB, Hurt RH. Biodissolution and Cellular Response to MoO3 Nanoribbons and a New Framework for Early Hazard Screening for 2D Materials. ENVIRONMENTAL SCIENCE. NANO 2018; 5:2545-2559. [PMID: 31548890 PMCID: PMC6756761 DOI: 10.1039/c8en00362a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Two-dimensional (2D) materials are a broad class of synthetic ultra-thin sheet-like solids whose rapid pace of development motivates systematic study of their biological effects and safe design. A challenge for this effort is the large number of new materials and their chemical diversity. Recent work suggests that many 2D materials will be thermodynamically unstable and thus non-persistent in biological environments. Such information could inform and accelerate safety assessment, but experimental data to confirm the thermodynamic predictions is lacking. Here we propose a framework for early hazard screening of nanosheet materials based on biodissolution studies in reactive media, specially chosen for each material to match chemically feasible degradation pathways. Simple dissolution and in vitro tests allow grouping of nanosheet materials into four classes: A, potentially biopersistent; B: slowly degradable (>24-48 hours); C, biosoluble with potentially hazardous degradation products; and D, biosoluble with low-hazard degradation products. The proposed framework is demonstrated through an experimental case study on MoO3 nanoribbons, which have a dual 2D / 1D morphology and have been reported to be stable in aqueous stock solutions. The nanoribbons are shown to undergo rapid dissolution in biological simulant fluids and in cell culture, where they elicit no adverse responses up to 100μg ml-1 dose. These results place MoO3 nanoribbons in Class D, and assigns them a low priority for further nanotoxicology testing. We anticipate use of this framework could accelerate the risk assessment for the large set of new powdered 2D nanosheet materials, and promote their safe design and commercialization.
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Affiliation(s)
- Evan P Gray
- The School of Engineering, Brown University, Providence RI, 02912, United States.
| | - Cynthia L Browning
- The Department of Pathology and Laboratory Medicine, Brown University, 70 Ship Street, Providence RI, 02912, United States.
| | - Mengjing Wang
- The Department of Chemistry, Brown University, 156 George Street, Providence RI, 02912, United States
| | - Kyle D Gion
- The School of Engineering, Brown University, Providence RI, 02912, United States.
| | - Eric Y Chao
- The School of Engineering, Brown University, Providence RI, 02912, United States.
| | - Kristie J Koski
- Department of Chemistry, University of California Davis, 1 Shields Ave. Davis CA 95616.
| | - Agnes B Kane
- The Department of Pathology and Laboratory Medicine, Brown University, 70 Ship Street, Providence RI, 02912, United States.
| | - Robert H Hurt
- The School of Engineering, Brown University, Providence RI, 02912, United States.
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17
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Chernova T, Murphy FA, Galavotti S, Sun XM, Powley IR, Grosso S, Schinwald A, Zacarias-Cabeza J, Dudek KM, Dinsdale D, Le Quesne J, Bennett J, Nakas A, Greaves P, Poland CA, Donaldson K, Bushell M, Willis AE, MacFarlane M. Long-Fiber Carbon Nanotubes Replicate Asbestos-Induced Mesothelioma with Disruption of the Tumor Suppressor Gene Cdkn2a (Ink4a/Arf). Curr Biol 2018; 27:3302-3314.e6. [PMID: 29112861 PMCID: PMC5681354 DOI: 10.1016/j.cub.2017.09.007] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 07/18/2017] [Accepted: 09/05/2017] [Indexed: 02/07/2023]
Abstract
Mesothelioma is a fatal tumor of the pleura and is strongly associated with asbestos exposure. The molecular mechanisms underlying the long latency period of mesothelioma and driving carcinogenesis are unknown. Moreover, late diagnosis means that mesothelioma research is commonly focused on end-stage disease. Although disruption of the CDKN2A (INK4A/ARF) locus has been reported in end-stage disease, information is lacking on the status of this key tumor suppressor gene in pleural lesions preceding mesothelioma. Manufactured carbon nanotubes (CNTs) are similar to asbestos in terms of their fibrous shape and biopersistent properties and thus may pose an asbestos-like inhalation hazard. Here we show that instillation of either long CNTs or long asbestos fibers into the pleural cavity of mice induces mesothelioma that exhibits common key pro-oncogenic molecular events throughout the latency period of disease progression. Sustained activation of pro-oncogenic signaling pathways, increased proliferation, and oxidative DNA damage form a common molecular signature of long-CNT- and long-asbestos-fiber-induced pathology. We show that hypermethylation of p16/Ink4a and p19/Arf in CNT- and asbestos-induced inflammatory lesions precedes mesothelioma; this results in silencing of Cdkn2a (Ink4a/Arf) and loss of p16 and p19 protein, consistent with epigenetic alterations playing a gatekeeper role in cancer. In end-stage mesothelioma, silencing of p16/Ink4a is sustained and deletion of p19/Arf is detected, recapitulating human disease. This study addresses the long-standing question of which early molecular changes drive carcinogenesis during the long latency period of mesothelioma development and shows that CNT and asbestos pose a similar health hazard.
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Affiliation(s)
- Tatyana Chernova
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK
| | - Fiona A Murphy
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK
| | - Sara Galavotti
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK
| | - Xiao-Ming Sun
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK
| | - Ian R Powley
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK
| | - Stefano Grosso
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK
| | - Anja Schinwald
- Medical Research Council/University of Edinburgh, Centre for Inflammation Research, Queen's Medical Research Institute, Edinburgh EH16 4TJ, UK
| | - Joaquin Zacarias-Cabeza
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK
| | - Kate M Dudek
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK
| | - David Dinsdale
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK
| | - John Le Quesne
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK; University Hospitals of Leicester NHS Trust, Glenfield Hospital, Leicester LE3 9QP, UK
| | - Jonathan Bennett
- University Hospitals of Leicester NHS Trust, Glenfield Hospital, Leicester LE3 9QP, UK
| | - Apostolos Nakas
- University Hospitals of Leicester NHS Trust, Glenfield Hospital, Leicester LE3 9QP, UK
| | - Peter Greaves
- Department of Cancer Studies, University of Leicester, Leicester LE2 7LX, UK
| | - Craig A Poland
- Medical Research Council/University of Edinburgh, Centre for Inflammation Research, Queen's Medical Research Institute, Edinburgh EH16 4TJ, UK
| | - Ken Donaldson
- Medical Research Council/University of Edinburgh, Centre for Inflammation Research, Queen's Medical Research Institute, Edinburgh EH16 4TJ, UK
| | - Martin Bushell
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK.
| | - Anne E Willis
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK.
| | - Marion MacFarlane
- Medical Research Council Toxicology Unit, Hodgkin Building, PO Box 138, Lancaster Road, Leicester LE1 9HN, UK.
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18
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Ohara Y, Chew SH, Shibata T, Okazaki Y, Yamashita K, Toyokuni S. Phlebotomy as a preventive measure for crocidolite-induced mesothelioma in male rats. Cancer Sci 2018; 109:330-339. [PMID: 29193587 PMCID: PMC5797813 DOI: 10.1111/cas.13460] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 11/17/2017] [Accepted: 11/26/2017] [Indexed: 12/13/2022] Open
Abstract
Malignant mesothelioma (MM) is a rare but socially important neoplasm due to its association with asbestos exposure. Malignant mesothelioma is difficult to diagnose at an early stage, yet there are no particularly effective treatments available at the advanced stage, thus necessitating efficient strategies to prevent MM in individuals already exposed to asbestos. We previously showed that persistent oxidative damage caused by foreign body reaction and affinity of asbestos both to hemoglobin and histones is one of the major pathogeneses. Accordingly, as an effective strategy to prevent asbestos‐induced MM, we undertook the use of an iron chelator, deferasirox, which decreased the epithelial–mesenchymal transition in a crocidolite‐induced rat MM model. However, this agent may show adverse effects. Here, we studied the effects of iron removal by phlebotomy as a realistic measure on the same rat model. We injected a total of 5 mg crocidolite i.p. to F1 hybrid rats between the Fischer‐344 and Brown‐Norway strains at the age of 6 weeks. We repeated weekly or biweekly phlebotomy of 6‐8 mL/kg/time from 10 to 60 weeks of age. The animals were observed until 120 weeks. In male rats, phlebotomy significantly decreased the weight and nuclear grade of MM, and modestly reduced the associated ascites and the fraction of more malignant sarcomatoid subtype. Weekly phlebotomy prolonged long‐term survival. Our results indicate that appropriate phlebotomy may be a practical preventive measure to attenuate the initiation and promotion capacity of asbestos towards MM by reducing iron in individuals exposed to asbestos.
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Affiliation(s)
- Yuuki Ohara
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Shan-Hwu Chew
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Takahiro Shibata
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yasumasa Okazaki
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kyoko Yamashita
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Shinya Toyokuni
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan.,Sydney Medical School, The University of Sydney, Sydney, NSW, Australia
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Lara-Martínez LA, Massó F, Palacios González E, García-Peláez I, Contreras-Ramos A, Valverde M, Rojas E, Cervantes-Sodi F, Hernández-Gutiérrez S. Evaluating the biological risk of functionalized multiwalled carbon nanotubes and functionalized oxygen-doped multiwalled carbon nanotubes as possible toxic, carcinogenic, and embryotoxic agents. Int J Nanomedicine 2017; 12:7695-7707. [PMID: 29089764 PMCID: PMC5656341 DOI: 10.2147/ijn.s144777] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Carbon nanotubes (CNTs) have been a focus of attention due to their possible applications in medicine, by serving as scaffolds for cell growth and proliferation and improving mesenchymal cell transplantation and engraftment. The emphasis on the benefits of CNTs has been offset by the ample debate on the safety of nanotechnologies. In this study, we determine whether functionalized multiwalled CNTs (fMWCNTs) and functionalized oxygen-doped multiwalled CNTs (fCOxs) have toxic effects on rat mesenchymal stem cells (MSCs) in vitro by analyzing morphology and cell proliferation and, using in vivo models, whether they are able to transform MSCs in cancer cells or induce embryotoxicity. Our results demonstrate that there are statistically significant differences in cell proliferation and the cell cycle of MSCs in culture. We identified dramatic changes in cells that were treated with fMWCNTs. Our evaluation of the transformation to cancer cells and cytotoxicity process showed little effect. However, we found a severe embryotoxicity in chicken embryos that were treated with fMWCNTs, while fCOxs seem to exert cardioembryotoxicity and a discrete teratogenicity. Furthermore, it seems that the time of contact plays an important role during cell transformation and embryotoxicity. A single contact with fMWCNTs is not sufficient to transform cells in a short time; an exposure of fMWCNTs for 2 weeks led to cell transformation risk and cardioembryotoxicity effects.
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Affiliation(s)
- Luis A Lara-Martínez
- Department of Molecular Biology, School of Medicine, Universidad Panamericana, Mexico City, Mexico
| | - Felipe Massó
- Department of Physiology, National Institute of Cardiology Ignacio Chavez, Mexico City, Mexico
| | - Eduardo Palacios González
- Department of Microscopy, Ultra High Resolution Electron Microscopy Laboratory, Instituto Mexicano del Petróleo, Mexico City, Mexico
| | - Isabel García-Peláez
- Department of Embryology, Medicine Faculty, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
| | - Alejandra Contreras-Ramos
- Department of Developmental Biology Research and Experimental Teratogenicity, Children's Hospital of Mexico, Federico Gomez, Mexico City, Mexico
| | - Mahara Valverde
- Department of Genomic Medicine, Institute of Biomedical Research, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
| | - Emilio Rojas
- Department of Genomic Medicine, Institute of Biomedical Research, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
| | - Felipe Cervantes-Sodi
- Department of Physics and Mathematics, Nanoscience and Nanotechnology Laboratory, Universidad Iberoamericana, Mexico City, Mexico
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Kanda Y, Osaki M, Okada F. Chemopreventive Strategies for Inflammation-Related Carcinogenesis: Current Status and Future Direction. Int J Mol Sci 2017; 18:E867. [PMID: 28422073 PMCID: PMC5412448 DOI: 10.3390/ijms18040867] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 04/14/2017] [Accepted: 04/17/2017] [Indexed: 02/07/2023] Open
Abstract
A sustained and chronically-inflamed environment is characterized by the presence of heterogeneous inflammatory cellular components, including neutrophils, macrophages, lymphocytes and fibroblasts. These infiltrated cells produce growth stimulating mediators (inflammatory cytokines and growth factors), chemotactic factors (chemokines) and genotoxic substances (reactive oxygen species and nitrogen oxide) and induce DNA damage and methylation. Therefore, chronic inflammation serves as an intrinsic niche for carcinogenesis and tumor progression. In this article, we summarize the up-to-date findings regarding definitive/possible causes and mechanisms of inflammation-related carcinogenesis derived from experimental and clinical studies. We also propose 10 strategies, as well as candidate agents for the prevention of inflammation-related carcinogenesis.
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Affiliation(s)
- Yusuke Kanda
- Division of Pathological Biochemistry, Tottori University Faculty of Medicine, Yonago, Tottori 683-8503, Japan.
| | - Mitsuhiko Osaki
- Division of Pathological Biochemistry, Tottori University Faculty of Medicine, Yonago, Tottori 683-8503, Japan.
- Chromosome Engineering Research Center, Tottori University, Yonago, Tottori 683-8503, Japan.
| | - Futoshi Okada
- Division of Pathological Biochemistry, Tottori University Faculty of Medicine, Yonago, Tottori 683-8503, Japan.
- Chromosome Engineering Research Center, Tottori University, Yonago, Tottori 683-8503, Japan.
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21
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Yue T, Xu Y, Li S, Luo Z, Zhang X, Huang F. Ultrashort Single-Walled Carbon Nanotubes Insert into a Pulmonary Surfactant Monolayer via Self-Rotation: Poration and Mechanical Inhibition. J Phys Chem B 2017; 121:2797-2807. [DOI: 10.1021/acs.jpcb.7b00297] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | - Xianren Zhang
- State Key Laboratory of Organic-Inorganic
Composites, Beijing University of Chemical Technology, Beijing 100029, China
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22
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Padmore T, Stark C, Turkevich LA, Champion JA. Quantitative analysis of the role of fiber length on phagocytosis and inflammatory response by alveolar macrophages. Biochim Biophys Acta Gen Subj 2017; 1861:58-67. [PMID: 27784615 PMCID: PMC5228597 DOI: 10.1016/j.bbagen.2016.09.031] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 07/16/2016] [Accepted: 09/20/2016] [Indexed: 12/17/2022]
Abstract
BACKGROUND In the lung, macrophages attempt to engulf inhaled high aspect ratio pathogenic materials, secreting inflammatory molecules in the process. The inability of macrophages to remove these materials leads to chronic inflammation and disease. How the biophysical and biochemical mechanisms of these effects are influenced by fiber length remains undetermined. This study evaluates the role of fiber length on phagocytosis and molecular inflammatory responses to non-cytotoxic fibers, enabling development of quantitative length-based models. METHODS Murine alveolar macrophages were exposed to short and long populations of JM-100 glass fibers, produced by successive sedimentation and repeated crushing, respectively. Interactions between fibers and macrophages were observed using time-lapse video microscopy, and quantified by flow cytometry. Inflammatory biomolecules (TNF-α, IL-1α, COX-2, PGE2) were measured. RESULTS Uptake of short fibers occurred more readily than for long, but long fibers were more potent stimulators of inflammatory molecules. Stimulation resulted in dose-dependent secretion of inflammatory biomolecules but no cytotoxicity or strong ROS production. Linear cytokine dose-response curves evaluated with length-dependent potency models, using measured fiber length distributions, resulted in identification of critical fiber lengths that cause frustrated phagocytosis and increased inflammatory biomolecule production. CONCLUSION Short fibers played a minor role in the inflammatory response compared to long fibers. The critical lengths at which frustrated phagocytosis occurs can be quantified by fitting dose-response curves to fiber distribution data. GENERAL SIGNIFICANCE The single physical parameter of length can be used to directly assess the contributions of length against other physicochemical fiber properties to disease endpoints.
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Affiliation(s)
- Trudy Padmore
- Chemical & Biomolecular Engineering, Georgia Institute of Technology, United States
| | - Carahline Stark
- Chemical & Biomolecular Engineering, Georgia Institute of Technology, United States
| | | | - Julie A Champion
- Chemical & Biomolecular Engineering, Georgia Institute of Technology, United States.
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23
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Galiniak S, Bartosz G, Sadowska-Bartosz I. Is Iron Chelation Important in Preventing Glycation of Bovine Serum Albumin in Vitro? Cell Mol Biol Lett 2016; 20:562-70. [PMID: 26146126 DOI: 10.1515/cmble-2015-0033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 06/23/2015] [Indexed: 11/15/2022] Open
Abstract
The role of metal (especially) iron ions has been postulated to play a prominent role in protein glycation, suggesting antiglycating effectiveness of metal chelators. However, this rule may not apply to all model glycation systems. We found that metal chelators are not effective in prevention of glycation of bovine serum albumin (BSA) in vitro, and there is no correlation between the antiglycating effects of 32 compounds and their iron chelation activity as measured with the ferrozine test. These data indicate that the glycation of BSA in vitro is iron-independent and is not a proper system to study the role of metals in protein glycation.
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24
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Macrophage and Multinucleated Giant Cell Classification. CURRENT TOPICS IN ENVIRONMENTAL HEALTH AND PREVENTIVE MEDICINE 2016. [DOI: 10.1007/978-4-431-55732-6_1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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25
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Nomura H, Takanashi S, Tanaka M, Haniu H, Aoki K, Okamoto M, Kobayashi S, Takizawa T, Usui Y, Oishi A, Kato H, Saito N. Specific biological responses of the synovial membrane to carbon nanotubes. Sci Rep 2015; 5:14314. [PMID: 26388047 PMCID: PMC4585697 DOI: 10.1038/srep14314] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 08/25/2015] [Indexed: 12/21/2022] Open
Abstract
Biological evaluation of carbon nanotubes (CNTs) is typically performed in the lung or abdominal cavity; however, biological reactions to CNTs are predicted to be markedly different in other tissues. In applications of CNTs as reinforcement for artificial joints and drug delivery systems, including their use in bone regeneration, the intra-articular synovial membrane makes contact with the CNTs. Herein, we analyzed the reaction of the synovial membrane with multiwalled CNTs (MWCNTs). Injection of MWCNTs into rat knee joints revealed their dose-dependent incorporation into deep synovial membranes and the formation of granulation tissue, without long-term inflammation. MWCNTs were incorporated into human fibroblast-like synoviocytes (HFLSs), with less cytotoxicity than that observed in macrophages (RAW264 cells). Moreover, MWCNTs inhibited the release of cytokines and chemokines from HFLSs. The reaction of the synovial membrane with MWCNTs differed from that observed in other tissues; thus, detailed biological evaluation at each target site is necessary for clinical applications.
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Affiliation(s)
- Hiroki Nomura
- Department of Orthopaedic Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Seiji Takanashi
- Department of Orthopaedic Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Manabu Tanaka
- Department of Orthopaedic Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Hisao Haniu
- Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Kaoru Aoki
- Department of Orthopaedic Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Masanori Okamoto
- Department of Orthopaedic Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Shinsuke Kobayashi
- Department of Orthopaedic Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Takashi Takizawa
- Department of Orthopaedic Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Yuki Usui
- Aizawa Hospital Sports Medicine Center, Honjou 2-5-1, Matsumoto 390-8510, Japan
| | - Ayumu Oishi
- Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Hiroyuki Kato
- Department of Orthopaedic Surgery, Shinshu University School of Medicine, Asahi 3-1-1, Matsumoto 390-8621, Japan
| | - Naoto Saito
- Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Asahi 3-1-1, Matsumoto 390-8621, Japan
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26
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Pugnaloni A, Lucarini G, Rubini C, Smorlesi A, Tomasetti M, Strafella E, Armeni T, Gualtieri AF. Raw and thermally treated cement asbestos exerts different cytotoxicity effects on A549 cells in vitro. Acta Histochem 2015; 117:29-39. [PMID: 25466987 DOI: 10.1016/j.acthis.2014.10.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 10/07/2014] [Accepted: 10/23/2014] [Indexed: 02/07/2023]
Abstract
Raw cement asbestos (RCA) undergoes a complete solid state transformation when heated at high temperatures. The secondary raw material produced, high temperatures-cement asbestos (HT-CA) is composed of newly-formed crystals in place of the asbestos fibers present in RCA. Our previous study showed that HT-CA exerts lower cytotoxic cell damage compared to RCA. Nevertheless further investigations are needed to deepen our understanding of pathogenic pathways involving oxidative and nitrative damage. Our aim is to deepen the understanding of the biological effects on A549 cells of these materials regarding DNA damage related proteins (p53, its isoform p73 and TRAIL) and nitric oxide (NO) production during inducible nitric oxide synthase (iNOS)-mediated inflammation. Increments of p53/p73 expression, iNOS positive cells and NO concentrations were found with RCA, compared to HT-CA and controls mainly at 48 h. Interestingly, ferrous iron causing reactive oxygen species (ROS)-mediated DNA damage was found in RCA as a contaminant. HT-CA thermal treatment induces a global recrystallization with iron in a crystal form poorly released in media. HT-CA slightly interferes with genome expression and exerts lower inflammatory potential compared to RCA on biological systems. It could represent a safe approach for storing or recycling asbestos and an environmentally friendly alternative to asbestos waste.
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27
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Funahashi S, Okazaki Y, Ito D, Asakawa A, Nagai H, Tajima M, Toyokuni S. Asbestos and multi-walled carbon nanotubes generate distinct oxidative responses in inflammatory cells. J Clin Biochem Nutr 2014; 56:111-7. [PMID: 25759516 PMCID: PMC4345184 DOI: 10.3164/jcbn.14-92] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 08/26/2014] [Indexed: 12/28/2022] Open
Abstract
Asbestos exposure is considered a social burden by causing mesothelioma. Despite the use of synthetic materials, multi-walled carbon nanotubes (MWCNTs) are similar in dimension to asbestos and produce mesothelioma in animals. The role of inflammatory cells in mesothelial carcinogenesis remains unclear. Here, we evaluated the differences in inflammatory cell responses following exposure to these fibrous materials using a luminometer and L-012 (8-amino-5-chloro-7-phenylpyrido[3,4-d]pyridazine-1,4-(2H,3H) dione) to detect reactive oxygen species (ROS). Rat peripheral blood or RAW264.7 cells were used to assess the effects on neutrophils and macrophages, respectively. Crocidolite and amosite induced significant ROS generation by neutrophils with a peak at 10 min, whereas that of chrysotile was ~25% of the crocidolite/amosite response. MWCNTs with different diameters (~15, 50, 115 and 145 nm) and different carcinogenicity did not induce significant ROS in peripheral blood. However, the MWCNTs induced a comparable amount of ROS in RAW264.7 cells to that following asbestos treatment. The peaks for MWCNTs (0.5–1.5 h) were observed earlier than those for asbestos (1–5 h). Apocynin and superoxide dismutase significantly inhibited ROS generation for each fiber, suggesting an involvement of NADPH oxidase and superoxide. Thus, asbestos and MWCNTs induce different oxidative responses in inflammatory cells, indicating the importance of mesothelial cell evaluation for carcinogenesis.
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Affiliation(s)
- Satomi Funahashi
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
| | - Yasumasa Okazaki
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
| | - Daiki Ito
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
| | - Atsushi Asakawa
- ATTO Corporation, 3-2-2 Motoasakusa, Taito-ku, Tokyo 111-0041, Japan
| | - Hirotaka Nagai
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
| | - Masafumi Tajima
- ATTO Corporation, 3-2-2 Motoasakusa, Taito-ku, Tokyo 111-0041, Japan
| | - Shinya Toyokuni
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
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28
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Ohba T, Xu J, Alexander DB, Yamada A, Kanno J, Hirose A, Tsuda H, Imaizumi Y. MWCNT causes extensive damage to the ciliated epithelium of the trachea of rodents. J Toxicol Sci 2014; 39:499-505. [PMID: 24849684 DOI: 10.2131/jts.39.499] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The ciliated tracheobronchial epithelium plays an important role in the excretion of inhaled dust. While many reports indicate that inhaled multi-walled carbon nanotubes (MWCNT) induce inflammation and proliferative changes in the lung and pleura, their effects on the upper airway have not been reported. Two different types of MWCNTs, MWCNT-L (8 µm in length and 150 nm in diameter) and MWCNT-S (3 µm in length and 15 nm in diameter), were examined for their effect on the trachea as well as the bronchus and lung. In vitro, the movement of the cilia of primary tracheal epithelial cells was impaired by treatment with the 2 MWCNTs. Rats were treated with 0.3 ml of a 250 µg/ml suspension of MWCNTs on days 1, 4, and 7, and sacrificed on day 8. Extensive loss of ciliated cells and replacement by flat cells without cilia was observed in the trachea. Deposition of MWCNTs and occasional squamous cell metaplasia were found in the regenerative granulation tissue. The proportion of the lesion to the transverse section of the trachea was vehicle, 0; MWCNT-L, 27.2 ± 10.5; MWCNT-S, 32.1 ± 15.8 (both MWCNTs, p < 0.001 vs vehicle). The amount of cilia showed significant decrease in the MWCNT-L treated rats (p < 0.05). In contrast to the trachea lesions, the number of inflammatory foci in the lung was greater in the MWCNT-S than in the MWCNT-L treated rats. Our results indicate that both MWCNTs caused extensive damage to the ciliated epithelium of the trachea. This damage may prolong the deposition of inhaled MWNCT in the lung.
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Affiliation(s)
- Teruya Ohba
- Department of Molecular and Cellular Pharmacology, Nagoya City University Graduate School of Pharmaceutical Sciences
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29
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Cui H, Wu W, Okuhira K, Miyazawa K, Hattori T, Sai K, Naito M, Suzuki K, Nishimura T, Sakamoto Y, Ogata A, Maeno T, Inomata A, Nakae D, Hirose A, Nishimaki-Mogami T. High-temperature calcined fullerene nanowhiskers as well as long needle-like multi-wall carbon nanotubes have abilities to induce NLRP3-mediated IL-1β secretion. Biochem Biophys Res Commun 2014; 452:593-9. [PMID: 25181346 DOI: 10.1016/j.bbrc.2014.08.118] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 08/22/2014] [Indexed: 02/01/2023]
Abstract
Because multi-wall carbon nanotubes (MWCNTs) have asbestos-like shape and size, concerns about their pathogenicity have been raised. Contaminated metals of MWCNTs may also be responsible for their toxicity. In this study, we employed high-temperature calcined fullerene nanowhiskers (HTCFNWs), which are needle-like nanofibers composed of amorphous carbon having similar sizes to MWCNTs but neither metal impurities nor tubular structures, and investigated their ability to induce production a major proinflammatory cytokine IL-1β via the Nod-like receptor pyrin domain containing 3 (NLRP3)-containing flammasome-mediated mechanism. When exposed to THP-1 macrophages, long-HTCFNW exhibited robust IL-1β production as long and needle-like MWCNTs did, but short-HTCFNW caused very small effect. IL-1β release induced by long-HTCFNW as well as by long, needle-like MWCNTs was abolished by a caspase-1 inhibitor or siRNA-knockdown of NLRP3, indicating that NLRP3-inflammasome-mediated IL-1β production by these carbon nanofibers. Our findings indicate that the needle-like shape and length, but neither metal impurities nor tubular structures of MWCNTs were critical to robust NLRP3 activation.
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Affiliation(s)
- Hongyan Cui
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Weijia Wu
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Keiichiro Okuhira
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Kun'ichi Miyazawa
- Fullerene Engineering Group, Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
| | - Takayuki Hattori
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Kimie Sai
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Mikihiko Naito
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Kazuhiro Suzuki
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Tetsuji Nishimura
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Yoshimitsu Sakamoto
- Department of Environmental Health and Toxicology, Tokyo Metropolitan Institute of Public Health, Tokyo 169-0073, Japan
| | - Akio Ogata
- Department of Environmental Health and Toxicology, Tokyo Metropolitan Institute of Public Health, Tokyo 169-0073, Japan
| | - Tomokazu Maeno
- Department of Environmental Health and Toxicology, Tokyo Metropolitan Institute of Public Health, Tokyo 169-0073, Japan
| | - Akiko Inomata
- Department of Environmental Health and Toxicology, Tokyo Metropolitan Institute of Public Health, Tokyo 169-0073, Japan
| | - Dai Nakae
- Department of Environmental Health and Toxicology, Tokyo Metropolitan Institute of Public Health, Tokyo 169-0073, Japan
| | - Akihiko Hirose
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan
| | - Tomoko Nishimaki-Mogami
- Division of Biochemistry and Metabolism, Division of Biochemistry and Molecular Biology, Division of Environmental Chemistry, Division of Risk Assessment, and Biological Safety Research Center, National Institute of Health Sciences, Tokyo 158-8501, Japan.
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Xu J, Alexander DB, Futakuchi M, Numano T, Fukamachi K, Suzui M, Omori T, Kanno J, Hirose A, Tsuda H. Size- and shape-dependent pleural translocation, deposition, fibrogenesis, and mesothelial proliferation by multiwalled carbon nanotubes. Cancer Sci 2014; 105:763-9. [PMID: 24815191 PMCID: PMC4317921 DOI: 10.1111/cas.12437] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 04/10/2014] [Accepted: 04/29/2014] [Indexed: 11/30/2022] Open
Abstract
Multiwalled carbon nanotubes (MWCNT) have a fibrous structure similar to asbestos, raising concern that MWCNT exposure may lead to asbestos-like diseases. Previously we showed that MWCNT translocated from the lung alveoli into the pleural cavity and caused mesothelial proliferation and fibrosis in the visceral pleura. Multiwalled carbon nanotubes were not found in the parietal pleura, the initial site of development of asbestos-caused pleural diseases in humans, probably due to the short exposure period of the study. In the present study, we extended the exposure period to 24 weeks to determine whether the size and shape of MWCNT impact on deposition and lesion development in the pleura and lung. Two different MWCNTs were chosen for this study: a larger sized needle-like MWCNT (MWCNT-L; l = 8 μm, d = 150 nm), and a smaller sized MWCNT (MWCNT-S; l = 3 μm, d = 15 nm), which forms cotton candy-like aggregates. Both MWCNT-L and MWCNT-S suspensions were administered to the rat lung once every 2 weeks for 24 weeks by transtracheal intrapulmonary spraying. It was found that MWCNT-L, but not MWCNT-S, translocated into the pleural cavity, deposited in the parietal pleura, and induced fibrosis and patchy parietal mesothelial proliferation lesions. In addition, MWCNT-L induced stronger inflammatory reactions including increased inflammatory cell number and cytokine/chemokine levels in the pleural cavity lavage than MWCNT-S. In contrast, MWCNT-S induced stronger inflammation and higher 8-hydroxydeoxyguanosine level in the lung tissue than MWCNT-L. These results suggest that MWCNT-L has higher risk of causing asbestos-like pleural lesions relevant to mesothelioma development.
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Affiliation(s)
- Jiegou Xu
- Laboratory of Nanotoxicology Project, Nagoya City University, Nagoya, Japan; Department of Immunology, Anhui Medical University College of Basic Medical Sciences, Hefei, China
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Nagai H, Okazaki Y, Chew SH, Misawa N, Miyata Y, Shinohara H, Toyokuni S. Intraperitoneal administration of tangled multiwalled carbon nanotubes of 15 nm in diameter does not induce mesothelial carcinogenesis in rats. Pathol Int 2014; 63:457-62. [PMID: 24200157 DOI: 10.1111/pin.12093] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 08/15/2013] [Indexed: 02/03/2023]
Abstract
Multiwalled carbon nanotubes (MWCNTs) have attracted public attention not only for their potential applications in engineering and materials science but also for possible environmental risks. MWCNTs share similar properties with asbestos, a definite human carcinogen causing malignant mesothelioma (MM), in that they are both biopersistent thin fibers with a high aspect ratio. Certain types of MWCNTs do induce MM in animal experiments. Though there are many different types of MWCNTs awaiting use in industry, there is little evidence about what types of MWCNTs present a high risk for MM in vivo. We have previously shown that the diameter of MWCNTs is one of the critical factors for mesothelial injury, which eventually leads to MM. Because of the extensive commercial use of MWCNTs, the properties of MWCNTs that determine carcinogenic activity should be clarified. Here we report that a high dose (10 mg) of a tangled form of pristine MWCNT (with a diameter of 15 nm) did not induce MM after intraperitoneal administration in rats, which were followed for up to 3 years after injection. This observation strengthens our previous finding that the rigidity, diameter, length and surface properties of MWCNTs are important factors in MM induction in vivo.
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Affiliation(s)
- Hirotaka Nagai
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine
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32
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Rotoli BM, Guidi P, Bonelli B, Bernardeschi M, Bianchi MG, Esposito S, Frenzilli G, Lucchesi P, Nigro M, Scarcelli V, Tomatis M, Zanello PP, Fubini B, Bussolati O, Bergamaschi E. Imogolite: An Aluminosilicate Nanotube Endowed with Low Cytotoxicity and Genotoxicity. Chem Res Toxicol 2014; 27:1142-54. [DOI: 10.1021/tx500002d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
| | - Patrizia Guidi
- Department
of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy
| | - Barbara Bonelli
- Department
of Applied Science and Technology and INSTM, Unit of Torino Politecnico, Politecnico di Torino, 10129 Turin, Italy
| | | | | | - Serena Esposito
- Department
of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, 03043 Cassino, Italy
| | - Giada Frenzilli
- Department
of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy
| | - Paolo Lucchesi
- Department
of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy
| | - Marco Nigro
- Department
of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy
| | - Vittoria Scarcelli
- Department
of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy
| | - Maura Tomatis
- Department
of Chemistry and “G. Scansetti” Interdepartmental Center
for Studies on Asbestos and Other Toxic Particulates, University of Torino, 10125 Turin, Italy
| | | | - Bice Fubini
- Department
of Chemistry and “G. Scansetti” Interdepartmental Center
for Studies on Asbestos and Other Toxic Particulates, University of Torino, 10125 Turin, Italy
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33
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Boffetta P, Donaldson K, Moolgavkar S, Mandel JS. A systematic review of occupational exposure to synthetic vitreous fibers and mesothelioma. Crit Rev Toxicol 2014; 44:436-49. [DOI: 10.3109/10408444.2014.899558] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Kanno S, Hirano S, Chiba S, Takeshita H, Nagai T, Takada M, Sakamoto K, Mukai T. The role of Rho-kinases in IL-1β release through phagocytosis of fibrous particles in human monocytes. Arch Toxicol 2014; 89:73-85. [DOI: 10.1007/s00204-014-1238-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Accepted: 04/01/2014] [Indexed: 12/11/2022]
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Donaldson K, Poland CA, Murphy FA, MacFarlane M, Chernova T, Schinwald A. Pulmonary toxicity of carbon nanotubes and asbestos - similarities and differences. Adv Drug Deliv Rev 2013; 65:2078-86. [PMID: 23899865 DOI: 10.1016/j.addr.2013.07.014] [Citation(s) in RCA: 180] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 07/15/2013] [Accepted: 07/18/2013] [Indexed: 02/04/2023]
Abstract
Carbon nanotubes are a valuable industrial product but there is potential for human pulmonary exposure during production and their fibrous shape raises the possibility that they may have effects like asbestos, which caused a worldwide pandemic of disease in the20th century that continues into present. CNT may exist as fibres or as more compact particles and the asbestos-type hazard only pertains to the fibrous forms of CNT. Exposure to asbestos causes asbestosis, bronchogenic carcinoma, mesothelioma, pleural fibrosis and pleural plaques indicating that both the lungs and the pleura are targets. The fibre pathogenicity paradigm was developed in the 1970s-80s and has a robust structure/toxicity relationship that enables the prediction of the pathogenicity of fibres depending on their length, thickness and biopersistence. Fibres that are sufficiently long and biopersistent and that deposit in the lungs can cause oxidative stress and inflammation. They may also translocate to the pleura where they can be retained depending on their length, and where they cause inflammation and oxidative stress in the pleural tissues. These pathobiological processes culminate in pathologic change - fibroplasia and neoplasia in the lungs and the pleura. There may also be direct genotoxic effects of fibres on epithelial cells and mesothelium, contributing to neoplasia. CNT show some of the properties of asbestos and other types of fibre in producing these types of effects and more research is needed. In terms of the molecular pathways involved in the interaction of long biopersistent fibres with target tissue the events leading to mesothelioma have been a particular area of interest. A variety of kinase pathways important in proliferation are activated by asbestos leading to pre-malignant states and investigations are under way to determine whether fibrous CNT also affects these molecular pathways. Current research suggests that fibrous CNT can elicit effects similar to asbestos but more research is needed to determine whether they, or other nanofibres, can cause fibrosis and cancer in the long term.
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Vlachogianni T, Fiotakis K, Loridas S, Perdicaris S, Valavanidis A. Potential toxicity and safety evaluation of nanomaterials for the respiratory system and lung cancer. LUNG CANCER-TARGETS AND THERAPY 2013; 4:71-82. [PMID: 28210136 PMCID: PMC5217444 DOI: 10.2147/lctt.s23216] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Engineered nanomaterials (ENMs) are a diverse group of materials finding increasing use in manufacturing, computing, food, pharmaceuticals, and biomedicine due to their very small size and exceptional properties. Health and safety concerns for ENMs have forced regulatory agencies to consider preventive measures and regulations for workers’ health and safety protection. Respiratory system toxicity from inhalable ENMs is the most important concern to health specialists. In this review, we focus on similarities and differences between conventional microparticles (diameters in mm and μm), which have been previously studied, and nanoparticles (sizes between 1 and 100 nm) in terms of size, composition, and mechanisms of action in biological systems. In past decades, respirable particulate matter (PM), asbestos fibers, crystalline silicate, and various amorphous dusts have been studied, and epidemiological evidence has shown how dangerous they are to human health, especially from exposure in working environments. Scientific evidence has shown that there is a close connection between respirable PM and pulmonary oxidative stress through the generation of reactive oxygen species (ROS) and reactive nitrogen species (RNS). There is a close connection between oxidative stress in the cell and the elicitation of an inflammatory response via pro-inflammatory gene transcription. Inflammatory processes increase the risk for lung cancer. Studies in vitro and in vivo in the last decade have shown that engineered nanoparticles (ENPs) at various doses can cause ROS generation, oxidative stress, and pro-inflammatory gene expression in the cell. It is assumed that ENPs have the potential to cause acute respiratory diseases and probably lung cancer in humans. The situation regarding chronic exposure at low doses is more complicated. The long-term accumulation of ENPs in the respiratory system cannot be excluded. However, at present, exposure data for the general public regarding ENPs are not available.
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Affiliation(s)
| | | | | | - Stamatis Perdicaris
- Faculty of Pharmacy, Department of Pharmacognosy and Natural Product Chemistry, University of Athens, Athens, Greece
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Abstract
Few people expected that asbestos, a fibrous mineral, would be carcinogenic to humans. In fact, asbestos is a definite carcinogen in humans, causing a rare but aggressive cancer called malignant mesothelioma (MM). Mesothelial cells line the three somatic cavities and thus do not face the outer surface, but reduce the friction among numerous moving organs. MM has several characteristics: extremely long incubation period of 30-40 years after asbestos exposure, difficulty in clinical diagnosis at an early stage, and poor prognosis even under the current multimodal therapies. In Japan, 'Kubota shock' attracted considerable social attention in 2005 for asbestos-induced mesothelioma and, thereafter, the government enacted a law to provide the people suffering from MM a financial allowance. Several lines of recent evidence suggest that the major pathology associated with asbestos-induced MM is local iron overload, associated with asbestos exposure. Preclinical studies to prevent MM after asbestos exposure with iron reduction are in progress. In addition, novel target genes in mesothelial carcinogenesis have been discovered with recently recognized mesothelioma-prone families. Development of an effective preventive strategy is eagerly anticipated because of the long incubation period for MM.
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Camiade E, Gramond C, Jutand MA, Audignon S, Rinaldo M, Imbernon E, Luce D, Galateau-Sallé F, Astoul P, Pairon JC, Brochard P, Lacourt A. Characterization of a French series of female cases of mesothelioma. Am J Ind Med 2013; 56:1307-16. [PMID: 23939988 DOI: 10.1002/ajim.22229] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/27/2013] [Indexed: 01/01/2023]
Abstract
BACKGROUND More than 80% of mesothelioma cases in men are attributable to occupational asbestos exposure compared to only 40% in women. The objective of the study was to characterize a series of female pleural mesotheliomas according to known and suspected risk factors. METHODS From the exhaustive recording of 318 female mesothelioma cases in the French National Mesothelioma Surveillance Program between 1998 and 2009, multiple correspondence analysis and hybrid clustering were performed to characterize these cases according to expert assessed occupational and non-occupational exposure to asbestos and man-made vitreous fibers, X-ray exposure, and history of cancer and non-malignant respiratory diseases. RESULTS Four clusters were identified: (1) occupational exposure to asbestos and man-made vitreous fibers (7.9% of subjects); (2) radiation exposure during radiotherapy (12.9%); (3) increased asbestos exposure (19.8%); and (4) "non-exposure" characteristics (59.4%). CONCLUSION These results will allow hypotheses to be generated about associations between mesothelioma and non-occupational asbestos exposure, X-ray exposure and history of respiratory disease.
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Affiliation(s)
| | | | | | | | - Mickael Rinaldo
- CHU de Bordeaux; Service de médecine du travail et pathologies professionnelles; F-33000; Bordeaux; France
| | - Ellen Imbernon
- Institut de Veille Sanitaire (InVS); Département Santé Travail; F-94415; Saint-Maurice; France
| | | | | | - Philippe Astoul
- Hôpital NORD; Service d'Oncologie Thoracique; Maladies de la Plèvre, Pneumologie Interventionnelle; F-13915; Marseille Cedex 20; France
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Markowitz SB, Levin SM, Miller A, Morabia A. Asbestos, asbestosis, smoking, and lung cancer. New findings from the North American insulator cohort. Am J Respir Crit Care Med 2013; 188:90-6. [PMID: 23590275 DOI: 10.1164/rccm.201302-0257oc] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
RATIONALE Asbestos, smoking, and asbestosis increase lung cancer risk in incompletely elucidated ways. Smoking cessation among asbestos-exposed cohorts has been little studied. OBJECTIVES To measure the contributions of asbestos exposure, asbestosis, smoking, and their interactions to lung cancer risk in an asbestos-exposed cohort and to describe their reduction in lung cancer risk when they stop smoking. METHODS We examined lung cancer mortality obtained through the National Death Index for 1981 to 2008 for 2,377 male North American insulators for whom chest X-ray, spirometric, occupational, and smoking data were collected in 1981 to 1983 and for 54,243 non-asbestos-exposed blue collar male workers from Cancer Prevention Study II for whom occupational and smoking data were collected in 1982. MEASUREMENTS AND MAIN RESULTS Lung cancer caused 339 (19%) insulator deaths. Lung cancer mortality was increased by asbestos exposure alone among nonsmokers (rate ratio = 3.6 [95% confidence interval (CI), 1.7-7.6]), by asbestosis among nonsmokers (rate ratio = 7.40 [95% CI, 4.0-13.7]), and by smoking without asbestos exposure (rate ratio = 10.3 [95% CI, 8.8-12.2]). The joint effect of smoking and asbestos alone was additive (rate ratio = 14.4 [95% CI, 10.7-19.4]) and with asbestosis, supra-additive (rate ratio = 36.8 [95% CI, 30.1-45.0]). Insulator lung cancer mortality halved within 10 years of smoking cessation and converged with that of never-smokers 30 years after smoking cessation. CONCLUSIONS Asbestos increases lung cancer mortality among nonsmokers. Asbestosis further increases the lung cancer risk and, considered jointly with smoking, has a supra-additive effect. Insulators benefit greatly by quitting smoking.
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Affiliation(s)
- Steven B Markowitz
- Queens College, City University of New York, Flushing, New York, NY, USA.
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Nagai H, Okazaki Y, Chew SH, Misawa N, Yasui H, Toyokuni S. Deferasirox Induces Mesenchymal–Epithelial Transition in Crocidolite-Induced Mesothelial Carcinogenesis in Rats. Cancer Prev Res (Phila) 2013; 6:1222-30. [DOI: 10.1158/1940-6207.capr-13-0244] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Valavanidis A, Vlachogianni T, Fiotakis K, Loridas S. Pulmonary oxidative stress, inflammation and cancer: respirable particulate matter, fibrous dusts and ozone as major causes of lung carcinogenesis through reactive oxygen species mechanisms. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2013; 10:3886-907. [PMID: 23985773 PMCID: PMC3799517 DOI: 10.3390/ijerph10093886] [Citation(s) in RCA: 455] [Impact Index Per Article: 41.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 07/24/2013] [Accepted: 08/15/2013] [Indexed: 02/07/2023]
Abstract
Reactive oxygen or nitrogen species (ROS, RNS) and oxidative stress in the respiratory system increase the production of mediators of pulmonary inflammation and initiate or promote mechanisms of carcinogenesis. The lungs are exposed daily to oxidants generated either endogenously or exogenously (air pollutants, cigarette smoke, etc.). Cells in aerobic organisms are protected against oxidative damage by enzymatic and non-enzymatic antioxidant systems. Recent epidemiologic investigations have shown associations between increased incidence of respiratory diseases and lung cancer from exposure to low levels of various forms of respirable fibers and particulate matter (PM), at occupational or urban air polluting environments. Lung cancer increases substantially for tobacco smokers due to the synergistic effects in the generation of ROS, leading to oxidative stress and inflammation with high DNA damage potential. Physical and chemical characteristics of particles (size, transition metal content, speciation, stable free radicals, etc.) play an important role in oxidative stress. In turn, oxidative stress initiates the synthesis of mediators of pulmonary inflammation in lung epithelial cells and initiation of carcinogenic mechanisms. Inhalable quartz, metal powders, mineral asbestos fibers, ozone, soot from gasoline and diesel engines, tobacco smoke and PM from ambient air pollution (PM₁₀ and PM₂.₅) are involved in various oxidative stress mechanisms. Pulmonary cancer initiation and promotion has been linked to a series of biochemical pathways of oxidative stress, DNA oxidative damage, macrophage stimulation, telomere shortening, modulation of gene expression and activation of transcription factors with important role in carcinogenesis. In this review we are presenting the role of ROS and oxidative stress in the production of mediators of pulmonary inflammation and mechanisms of carcinogenesis.
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Affiliation(s)
- Athanasios Valavanidis
- Department of Chemistry, University of Athens, University Campus Zografou, Athens 15784, Greece.
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Okazaki Y, Nagai H, Chew SH, Li J, Funahashi S, Tsujimura T, Toyokuni S. CD146 and insulin-like growth factor 2 mRNA-binding protein 3 predict prognosis of asbestos-induced rat mesothelioma. Cancer Sci 2013; 104:989-95. [PMID: 23621518 DOI: 10.1111/cas.12185] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 04/21/2013] [Accepted: 04/25/2013] [Indexed: 11/27/2022] Open
Abstract
Malignant mesothelioma (MM), which is associated with asbestos exposure, is one of the most deadly tumors in humans. Early MM is concealed in the serosal cavities and lacks specific clinical symptoms. For better treatment, early detection and prognostic markers are necessary. Recently, CD146 and insulin-like growth factor 2 mRNA-binding protein 3 (IMP3) were reported as possible positive markers of MM to distinguish from reactive mesothelia in humans. However, their application on MM of different species and its impact on survival remain to be elucidated. To disclose the utility of these molecules as early detection and prognostic markers of MM, we injected chrysotile or crocidolite intraperitoneally to rats, thus obtaining 26 peritoneal MM and establishing 11 cell lines. We immunostained CD146 and IMP3 using paraffin-embedded tissues and cell blocks and found CD146 and IMP3 expression in 58% (15/26) and 65% (17/26) of MM, respectively, but not in reactive mesothelia. There was no significant difference in both immunostainings for overexpression among the three histological subtypes of MM and the expression of CD146 and IMP3 was proportionally associated. Furthermore, the overexpression of CD146 and/or IMP3 was proportionally correlated with shortened survival. These results suggest that CD146 and IMP3 are useful diagnostic and prognostic markers of MM.
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Affiliation(s)
- Yasumasa Okazaki
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Aichi, Japan
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Metamorphosis of mesothelial cells with active horizontal motility in tissue culture. Sci Rep 2013; 3:1144. [PMID: 23359855 PMCID: PMC3556594 DOI: 10.1038/srep01144] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 12/27/2012] [Indexed: 02/07/2023] Open
Abstract
Mesothelial cells, which have diverse roles in physiology and pathology, constitute the mesothelium along with connective tissue and the basement membrane; the mesothelium serves to shield the somatic cavities. After mesothelial injury, mesothelial cells undergo tissue recovery. However, the mechanism of mesothelial regeneration remains poorly understood. In this study, we used confocal time-lapse microscopy to demonstrate that transformed mesothelial cells (MeT5A) and mouse peritoneal mesothelial cells can randomly migrate between cells in cell culture and in ex vivo tissue culture, respectively. Moreover, peritoneal mesothelial cells changed their morphology from a flattened shape to a cuboidal one prior to the migration. Conversely, MDCKII epithelial cells forming tight cell–cell contacts with one another do not alter the arrangement of adjacent cells during movement. Our evidence complements the current hypotheses of mesothelial regeneration and suggests that certain types of differentiated mesothelial cells undergo morphological changes before initiating migration to repair injured sites.
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Honma M, Takahashi T, Asada S, Nakagawa Y, Ikeda A, Yamakage K. In vitro clastogenicity and phototoxicity of fullerene (C60) nanomaterials in mammalian cells. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2012; 749:97-100. [DOI: 10.1016/j.mrgentox.2012.08.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Revised: 07/31/2012] [Accepted: 08/24/2012] [Indexed: 12/15/2022]
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Xu J, Futakuchi M, Shimizu H, Alexander DB, Yanagihara K, Fukamachi K, Suzui M, Kanno J, Hirose A, Ogata A, Sakamoto Y, Nakae D, Omori T, Tsuda H. Multi-walled carbon nanotubes translocate into the pleural cavity and induce visceral mesothelial proliferation in rats. Cancer Sci 2012; 103:2045-50. [PMID: 22938569 DOI: 10.1111/cas.12005] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 08/20/2012] [Accepted: 08/22/2012] [Indexed: 11/30/2022] Open
Abstract
Multi-walled carbon nanotubes have a fibrous structure similar to asbestos and induce mesothelioma when injected into the peritoneal cavity. In the present study, we investigated whether carbon nanotubes administered into the lung through the trachea induce mesothelial lesions. Male F344 rats were treated with 0.5 mL of 500 μg/mL suspensions of multi-walled carbon nanotubes or crocidolite five times over a 9-day period by intrapulmonary spraying. Pleural cavity lavage fluid, lung and chest wall were then collected. Multi-walled carbon nanotubes and crocidolite were found mainly in alveolar macrophages and mediastinal lymph nodes. Importantly, the fibers were also found in the cell pellets of the pleural cavity lavage, mostly in macrophages. Both multi-walled carbon nanotube and crocidolite treatment induced hyperplastic proliferative lesions of the visceral mesothelium, with their proliferating cell nuclear antigen indices approximately 10-fold that of the vehicle control. The hyperplastic lesions were associated with inflammatory cell infiltration and inflammation-induced fibrotic lesions of the pleural tissues. The fibers were not found in the mesothelial proliferative lesions themselves. In the pleural cavity, abundant inflammatory cell infiltration, mainly composed of macrophages, was observed. Conditioned cell culture media of macrophages treated with multi-walled carbon nanotubes and crocidolite and the supernatants of pleural cavity lavage fluid from the dosed rats increased mesothelial cell proliferation in vitro, suggesting that mesothelial proliferative lesions were induced by inflammatory events in the lung and pleural cavity and likely mediated by macrophages. In conclusion, intrapulmonary administration of multi-walled carbon nanotubes, like asbestos, induced mesothelial proliferation potentially associated with mesothelioma development.
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Affiliation(s)
- Jiegou Xu
- Laboratory of Nanotoxicology Project, Nagoya City University, Nagoya, Japan
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Kubo Y, Takenaka H, Nagai H, Toyokuni S. Distinct affinity of nuclear proteins to the surface of chrysotile and crocidolite. J Clin Biochem Nutr 2012; 51:221-6. [PMID: 23170051 PMCID: PMC3491248 DOI: 10.3164/jcbn.12-39] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2012] [Accepted: 04/28/2012] [Indexed: 11/22/2022] Open
Abstract
The inhalation of asbestos is a risk factor for the development of malignant mesothelioma and lung cancer. Based on the broad surface area of asbestos fibers and their ability to enter the cytoplasm and nuclei of cells, it was hypothesized that proteins that adsorb onto the fiber surface play a role in the cytotoxicity and carcinogenesis of asbestos fibers. However, little is known about which proteins adsorb onto asbestos. Previously, we systematically identified asbestos-interacting proteins and classified them into eight sub-categories: chromatin/nucleotide/RNA-binding proteins, ribosomal proteins, cytoprotective proteins, cytoskeleton-associated proteins, histones and hemoglobin. Here, we report an adsorption profile of proteins for the three commercially used asbestos compounds: chrysotile, crocidolite and amosite. We quantified the amounts of adsorbed proteins by analyzing the silver-stained gels of sodium dodecyl sulfate-polyacrylamide gel electrophoresis with ImageJ software, using the bands for amosite as a standard. We found that histones were most adsorptive to crocidolite and that chromatin-binding proteins were most adsorptive to chrysotile. The results suggest that chrysotile and crocidolite directly interact with chromatin structure through different mechanisms. Furthermore, RNA-binding proteins preferably interacted with chrysotile, suggesting that chrysotile may interfere with transcription and translation. Our results provide novel evidence demonstrating that the specific molecular interactions leading to carcinogenesis are different between chrysotile and crocidolite.
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Affiliation(s)
- Yurika Kubo
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
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Murphy FA, Poland CA, Duffin R, Donaldson K. Length-dependent pleural inflammation and parietal pleural responses after deposition of carbon nanotubes in the pulmonary airspaces of mice. Nanotoxicology 2012; 7:1157-67. [PMID: 22812632 DOI: 10.3109/17435390.2012.713527] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Carbon nanotubes (CNT) are fibre-like nanomaterials whose structural similarity to asbestos has raised concerns that they may also pose a mesothelioma hazard. The objective of this study was to examine the inflammatory potential of three CNT samples of differing length on the lungs and pleural cavity following introduction into the airspaces of mice. RESULTS Aspiration of the two short/tangled and one long CNT sample into the lungs of mice resulted in a length-dependent inflammatory response at 1 week, i.e., only the long CNT sample caused acute neutrophilic inflammation in bronchoalveolar lavage at 1 week and progressive thickening of the alveolar septa. The authors also report length-dependent inflammatory responses in the pleural lavage after exposure only to the long CNT. The inflammatory response in the pleural cavity to long fibres and the appearance of lesions along the chest wall and diaphragm was not present at 1 week and only evident by 6 weeks post-exposure. CONCLUSION Length-dependent pathogenicity is a feature of asbestos and the results presented in this study demonstrate similar length-dependent pathogenicity of CNT in the lungs and pleural space following airspace deposition. The data support the contention that long CNT reach the pleura from the airspaces, and that they are retained at the parietal pleura and cause inflammation and lesion development. The parietal pleura is the site of origin of mesothelioma and inflammation is considered to be a process involved in asbestos carcinogenesis and so the data support the contention that CNT may pose an asbestos-like mesothelioma hazard.
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Affiliation(s)
- Fiona A Murphy
- Queen's Medical Research Institute, MRC/University of Edinburgh Centre for Inflammation Research, ELEGI Colt Laboratory, 47 Little France Crescent, Edinburgh, UK
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Maeda M, Yamamoto S, Chen Y, Kumagai-Takei N, Hayashi H, Matsuzaki H, Lee S, Hatayama T, Miyahara N, Katoh M, Hiratsuka JI, Nishimura Y, Otsuki T. Resistance to asbestos-induced apoptosis with continuous exposure to crocidolite on a human T cell. THE SCIENCE OF THE TOTAL ENVIRONMENT 2012; 429:174-182. [PMID: 22608188 DOI: 10.1016/j.scitotenv.2012.04.043] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 03/08/2012] [Accepted: 04/17/2012] [Indexed: 06/01/2023]
Abstract
We have been investigating the immunological effects of asbestos. The establishment of a low-dose and continuously exposed human T cell line, HTLV-1 immortalized MT-2, to chrysotile (CB) revealed reduction of CXCR3 chemokine receptor and production of IFN-γ that caused a decline of tumor immunity. These effects were coupled with upregulation of IL-10, TGF-β, and BCL-2 in asbestos-exposed patients. To observe the immunological effects of crocidolite (CR) on human T cells, a trial to establish a low-dose and continuously exposed model was conducted and compared with a previously reported CB-exposed model (MT-2CB). Transient exposure of MT-2 original cells to CB or CR induced a similar level of apoptosis and growth inhibition. The establishment of a continuously exposed subline to CR (MT-2CR) revealed resistance against CR-induced apoptosis and upregulation of the BCL-2/BAX ratio similar to that recorded for MT-2CB. Both sublines showed reduced production of IFN-γ, TNF-α, and IL-6 with increased IL-10. cDNA microarray with network/pathway analyses focusing on transcription factors revealed that many similar factors related to cell proliferation were involved following continuous exposure to asbestos in both MT-2CB and MT-2CR. These results indicate that both CB and CR fibers affect human T cells with similar degrees even though the carcinogenic activity of these substances differs due to their chemical and physical forms. Trials to identify early detection markers for asbestos exposure or the occurrence of asbestos-inducing malignancies using these findings may lead to the development of clinical tools for asbestos-related diseases and chemoprevention that modifies the reduced tumor immunity.
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Affiliation(s)
- Megumi Maeda
- Department of Biofunctional Chemistry, Graduate School of Natural Science and Technology, Okayama University, 1-1-1 Tsushima-Naka, Okayama 700-8530, Japan
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Takagi A, Hirose A, Futakuchi M, Tsuda H, Kanno J. Dose-dependent mesothelioma induction by intraperitoneal administration of multi-wall carbon nanotubes in p53 heterozygous mice. Cancer Sci 2012; 103:1440-4. [PMID: 22537085 PMCID: PMC3569866 DOI: 10.1111/j.1349-7006.2012.02318.x] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 03/25/2012] [Accepted: 04/22/2012] [Indexed: 11/30/2022] Open
Abstract
Among various types of multi-wall carbon nanotubes (mwcnt) are those containing fibrous particles longer than 5 μm with an aspect ratio of more than three (i.e. dimensions similar to mesotheliomagenic asbestos). A previous study showed that micrometer-sized mwcnt (μm-mwcnt) administered intraperitoneally at a dose of 3000 μg/mouse corresponding to 1 × 109 fibers per mouse induced mesotheliomas in p53 heterozygous mice. Here, we report a dose-response study; three groups of p53 heterozygous mice (n = 20) were given a single intraperitoneal injection of 300 μg/mouse of μm-mwcnt (corresponding to 1 × 108 fibers), 30 μg/mouse (1 × 107) or 3 μg/mouse (1 × 106), respectively, and observed for up to 1 year. The cumulative incidence of mesotheliomas was 19/20, 17/20 and 5/20, respectively. The severity of peritoneal adhesion and granuloma formation were dose-dependent and minimal in the lowest dose group. However, the time of tumor onset was apparently independent of the dose. All mice in the lowest dose group that survived until the terminal kill had microscopic atypical mesothelial hyperplasia considered as a precursor lesion of mesothelioma. Right beneath was a mononuclear cell accumulation consisting of cd45- or cd3-positive lymphocytes and cd45/cd3-negative f4/80 faintly positive macrophages; some of the macrophages contained singular mwcnt in their cytoplasm. The lesions were devoid of epithelioid cell granuloma and fibrosis. These findings were in favor of the widely proposed mode of action of fiber carcinogenesis, that is, frustrated phagocytosis where the mesotheliomagenic microenvironment on the peritoneal surface is neither qualitatively altered by the density of the fibers per area nor by the formation of granulomas against agglomerates. (Cancer Sci 2012; 103: 1440–1444)
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Affiliation(s)
- Atsuya Takagi
- Division of Cellular and Molecular Toxicology, Biological Safety Research Center, National Institute of Health Sciences, Tokyo, Japan
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Nagai H, Toyokuni S. Differences and similarities between carbon nanotubes and asbestos fibers during mesothelial carcinogenesis: shedding light on fiber entry mechanism. Cancer Sci 2012; 103:1378-90. [PMID: 22568550 DOI: 10.1111/j.1349-7006.2012.02326.x] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Accepted: 05/03/2012] [Indexed: 11/29/2022] Open
Abstract
The emergence of nanotechnology represents an important milestone, as it opens the way to a broad spectrum of applications for nanomaterials in the fields of engineering, industry and medicine. One example of nanomaterials that have the potential for widespread use is carbon nanotubes, which have a tubular structure made of graphene sheets. However, there have been concerns that they may pose a potential health risk due to their similarities to asbestos, namely their high biopersistence and needle-like structure. We recently found that despite these similarities, carbon nanotubes and asbestos differ in certain aspects, such as their mechanism of entry into mesothelial cells. In the study, we showed that non-functionalized, multi-walled carbon nanotubes enter mesothelial cells by directly piercing through the cell membrane in a diameter- and rigidity-dependent manner, whereas asbestos mainly enters these cells through the process of endocytosis, which is independent of fiber diameter. In this review, we discuss the key differences, as well as similarities, between asbestos fibers and carbon nanotubes. We also summarize previous reports regarding the mechanism of carbon nanotube entry into non-phagocytic cells. As the entry of fibers into mesothelial cells is a crucial step in mesothelial carcinogenesis, we believe that a comprehensive study on the differences by which carbon nanotubes and asbestos fibers enter into non-phagocytic cells will provide important clues for the safer manufacture of carbon nanotubes through strict regulation on fiber characteristics, such as diameter, surface properties, length and rigidity.
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Affiliation(s)
- Hirotaka Nagai
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
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