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Thompson CM. Commentary on New Formaldehyde Studies in Trp53 Haploinsufficient Mice: Further Support for Nonlinear Risks From Inhaled Formaldehyde. Dose Response 2018; 16:1559325818777931. [PMID: 29872371 PMCID: PMC5974583 DOI: 10.1177/1559325818777931] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Accepted: 04/24/2018] [Indexed: 01/10/2023] Open
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102
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Bercu J, Galloway S, Parris P, Teasdale A, Masuda-Herrera M, Dobo K, Heard P, Kenyon M, Nicolette J, Vock E, Ku W, Harvey J, White A, Glowienke S, Martin E, Custer L, Jolly R, Thybaud V. Potential impurities in drug substances: Compound-specific toxicology limits for 20 synthetic reagents and by-products, and a class-specific toxicology limit for alkyl bromides. Regul Toxicol Pharmacol 2018; 94:172-182. [DOI: 10.1016/j.yrtph.2018.02.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 01/29/2018] [Accepted: 02/01/2018] [Indexed: 10/18/2022]
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103
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Ninh LN, Tangkawattana S, Sukon P, Takahashi N, Takehana K, Tangkawattana P. Neutralizing formaldehyde in chicken cadaver with urea and urea fertilizer solution. J Vet Med Sci 2018; 80:606-610. [PMID: 29415920 PMCID: PMC5938187 DOI: 10.1292/jvms.17-0480] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This study demonstrated the potential of using urea and urea fertilizer to neutralize
formaldehyde (Fd) in chicken cadavers. Initially, in vitro Fd
neutralization with various concentrations of urea solution (US) and urea fertilizer
solution (UFS) was conducted; subsequently, 18% US and 27% UFS were selected for infusing
into the formalinized chickens. The measurement at 48 hr after infusion showed that both
solutions could effectively lower Fd in chicken cadavers to below a permissible exposure
limit without affecting cadaveric and histological quality. In addition, neutralizing
power of 18% US was approximately 1.3 times that of 27% UFS. This is the first
demonstration of neutralizing potential of US and UFS against Fd both in
vitro and in vivo.
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Affiliation(s)
- Le Ngoc Ninh
- Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi 131010, Vietnam
| | - Sirikachorn Tangkawattana
- Department of Veterinary Pathobiology, Faculty of Veterinary Medicine, Khon Kaen University, Khon Kaen 40002, Thailand.,WHO Collaborating Center for Research and Control of Opisthorchiasis (Southeast Asian Liver Fluke Disease), Tropical Disease Research Center, Department of Pathology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Peerapol Sukon
- Department of Veterinary Anatomy, Faculty of Veterinary Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Naoki Takahashi
- Laboratory of Microanatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkiado 069-8501, Japan
| | - Kazushige Takehana
- Laboratory of Microanatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkiado 069-8501, Japan
| | - Prasarn Tangkawattana
- Department of Veterinary Anatomy, Faculty of Veterinary Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
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104
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105
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Mundt KA, Gentry PR, Dell LD, Rodricks JV, Boffetta P. Six years after the NRC review of EPA's Draft IRIS Toxicological Review of Formaldehyde: Regulatory implications of new science in evaluating formaldehyde leukemogenicity. Regul Toxicol Pharmacol 2017; 92:472-490. [PMID: 29158043 DOI: 10.1016/j.yrtph.2017.11.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 10/27/2017] [Accepted: 11/15/2017] [Indexed: 11/28/2022]
Abstract
Shortly after the International Agency for Research on Cancer (IARC) determined that formaldehyde causes leukemia, the United States Environmental Protection Agency (EPA) released its Draft IRIS Toxicological Review of Formaldehyde ("Draft IRIS Assessment"), also concluding that formaldehyde causes leukemia. Peer review of the Draft IRIS Assessment by a National Academy of Science committee noted that "causal determinations are not supported by the narrative provided in the draft" (NRC 2011). They offered recommendations for improving the Draft IRIS assessment and identified several important research gaps. Over the six years since the NRC peer review, significant new science has been published. We identify and summarize key recommendations made by NRC and map them to this new science, including extended analysis of epidemiological studies, updates of earlier occupational cohort studies, toxicological experiments using a sensitive mouse strain, mechanistic studies examining the role of exogenous versus endogenous formaldehyde in bone marrow, and several critical reviews. With few exceptions, new findings are consistently negative, and integration of all available evidence challenges the earlier conclusions that formaldehyde causes leukemia. Given formaldehyde's commercial importance, environmental ubiquity and endogenous production, accurate hazard classification and risk evaluation of whether exposure to formaldehyde from occupational, residential and consumer products causes leukemia are critical.
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Affiliation(s)
- Kenneth A Mundt
- Environment and Health, Ramboll Environ, Amherst MA, United States.
| | - P Robinan Gentry
- Environment and Health, Ramboll Environ, Amherst MA, United States
| | - Linda D Dell
- Environment and Health, Ramboll Environ, Amherst MA, United States
| | | | - Paolo Boffetta
- Icahn School of Medicine at Mount Sinai, New York, NY, USA
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106
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Thompson CM, Suh M, Proctor DM, Haws LC, Harris MA. Ten factors for considering the mode of action of Cr(VI)-induced gastrointestinal tumors in rodents. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2017; 823:45-57. [DOI: 10.1016/j.mrgentox.2017.08.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 08/26/2017] [Accepted: 08/28/2017] [Indexed: 12/28/2022]
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107
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Wu D, Jiang Z, Gong B, Dou Y, Song M, Song X, Tian Y. Vitamin E Reversed Apoptosis of Cardiomyocytes Induced by Exposure to High Dose Formaldehyde During Mice Pregnancy. Int Heart J 2017; 58:769-777. [PMID: 28966308 DOI: 10.1536/ihj.16-279] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In this study, we investigated the protection effect of Vitamin E (Vit E) on formaldehyde (FA) exposure during pregnancy induced apoptosis of cardiomyocytes, and used an HL-1 cell line to confirmed the findings in vivo.Pregnant mice received different doses of FA (0.5 mg/kg, 1.0 mg/kg, 1.5 mg/kg, 0.1 μg Vit E, or 1.5 mg/kg + 0.1 μg Vit E). TUNEL staining was used to reveal the apoptosis in cardiomyocytes, and SOD, MDA, GSH, Livin, and Caspase-3 in cardiomyocytes were detected by ELISA, RT-PCR, and Western blot. For in vitro study, HL-1 cells were treated with vehicle, 5 μmol/L FA, 25 μmol/L FA, 50 μmol/L FA, 10 mg/L Vit. E, and 50 μmol/L FA+ 10 mg/L Vit E, respectively. CCK-8 assay and flow cytometry were used to evaluate cell vitality and apoptosis. A high dose of FA exposure led to cytotoxicity in both pregnant mice and offspring, as TUNEL staining revealed a significant apoptosis of cardiomyocytes, and the alternation in SOD, GSH, MDA, Livin, and Caspase-3 was found in cardiomyocytes. 0.1 μg Vit. E could reverse high doses of FA exposure induced apoptosis of cardiomyocytes in both pregnant mice and offspring. The in vitro study revealed that FA exposure induced a decrease of cell viability and increased cell apoptosis, as well as oxidative stress in HL-1 cells with alternation in SOD, GSH, MDA, Livin, and Caspase-3.This study revealed a high dose of FA induced oxidative stress and apoptosis of cardiomyocytes in both pregnant mice and offspring, and Vit E supplement during pregnancy reversed the systemic and myocardial toxicity of FA.
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Affiliation(s)
- Dongyuan Wu
- Department of Echocardiography, The Affiliated Hospital of Qingdao University, Qingdao
| | - Zhirong Jiang
- Department of Echocardiography, The Affiliated Hospital of Qingdao University, Qingdao
| | - Bing Gong
- Departments of Ultrasonography, The Central Hospital of Jilin City
| | - Yue Dou
- Department of Cardiovascular Medicine, The Central Hospital of Jilin City
| | - Mingxuan Song
- Departments of Ultrasonography, The Central Hospital of Jilin City
| | - Xiaoxia Song
- Department of Echocardiography, The Affiliated Hospital of Qingdao University, Qingdao
| | - Yu Tian
- Department of Echocardiography, The Affiliated Hospital of Qingdao University, Qingdao
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108
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Chen D, Fang L, Mei S, Li H, Xu X, Des Marais TL, Lu K, Liu XS, Jin C. Regulation of Chromatin Assembly and Cell Transformation by Formaldehyde Exposure in Human Cells. ENVIRONMENTAL HEALTH PERSPECTIVES 2017; 125:097019. [PMID: 28937961 PMCID: PMC5915180 DOI: 10.1289/ehp1275] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 05/19/2017] [Accepted: 05/23/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Formaldehyde (FA) is an environmental and occupational chemical carcinogen. Recent studies have shown that exogenous FA causes only a modest increase in DNA adduct formation compared with the amount of adducts formed by endogenous FA, raising the possibility that epigenetic mechanisms may contribute to FA-mediated carcinogenicity. OBJECTIVES We investigated the effects of FA exposure on histone modifications and chromatin assembly. We also examined the role of defective chromatin assembly in FA-mediated transcription and cell transformation. METHODS Cellular fractionation and Western blot analysis were used to measure the levels of histone modifications in human bronchial epithelial BEAS-2B cells and human nasal RPMI2650 cells in the presence of FA. Chromatin immunoprecipitation (ChIP) and micrococcal nuclease (MNase) digest assays were performed to examine the changes in chromatin assembly and accessibility after FA exposure. RNA sequencing (RNA-seq) and real-time polymerase chain reaction (PCR) were used to examine transcriptional dysregulation. Finally, anchorage-independent cell growth ability was tested by soft agar assay following FA exposure. RESULTS Exposure to FA dramatically decreased the acetylation of the N-terminal tails of cytosolic histones. These modifications are important for histone nuclear import and subsequent chromatin assembly. Histone proteins were depleted in both the chromatin fraction and at most of the genomic loci tested following FA exposure, suggesting that FA compromises chromatin assembly. Moreover, FA increased chromatin accessibility and altered the expression of hundreds of cancer-related genes. Knockdown of the histone H3.3 gene (an H3 variant), which mimics inhibition of chromatin assembly, facilitated FA-mediated anchorage-independent cell growth. CONCLUSIONS We propose that the inhibition of chromatin assembly represents a novel mechanism of cell transformation induced by the environmental and occupational chemical carcinogen FA. https://doi.org/10.1289/EHP1275.
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Affiliation(s)
- Danqi Chen
- Department of Environmental Medicine and Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, USA
| | - Lei Fang
- Department of Environmental Medicine and Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, USA
| | - Shenglin Mei
- Department of Bioinformatics, School of Life Sciences, Tongji University, Shanghai, China
| | - Hongjie Li
- Department of Environmental Medicine and Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, USA
| | - Xia Xu
- Department of Environmental Medicine and Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, USA
| | - Thomas L Des Marais
- Department of Environmental Medicine and Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, USA
| | - Kun Lu
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina, USA
| | - X Shirley Liu
- Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute and Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Chunyuan Jin
- Department of Environmental Medicine and Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, USA
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109
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Edrissi B, Taghizadeh K, Moeller BC, Yu R, Kracko D, Doyle-Eisele M, Swenberg JA, Dedon PC. N 6-Formyllysine as a Biomarker of Formaldehyde Exposure: Formation and Loss of N 6-Formyllysine in Nasal Epithelium in Long-Term, Low-Dose Inhalation Studies in Rats. Chem Res Toxicol 2017; 30:1572-1576. [PMID: 28692800 PMCID: PMC5807069 DOI: 10.1021/acs.chemrestox.7b00075] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Exposure to both endogenous and exogenous formaldehyde has been established to be carcinogenic, likely by virtue of forming nucleic acid and proteins adducts such as N6-formyllysine. To better assess N6-formyllysine as a biomarker of formaldehyde exposure, we studied accumulation of N6-formyllysine adducts in tissues of rats exposed by inhalation to 2 ppm [13C2H2]-formaldehyde for 7, 14, 21, and 28 days (6 h/day) and investigated adduct loss over a 7-day postexposure period using liquid chromatography-coupled tandem mass spectrometry. Our results showed formation of exogenous adducts in nasal epithelium and to some extent in trachea but not in distant tissues of lung, bone marrow, or white blood cells, with a 2-fold increase over endogenous N6-formyllysine over a 3-week exposure period. Postexposure analyses indicated a biexponential decay of N6-formyllysine in proteins extracted from different cellular compartments, with half-lives of ∼25 and ∼182 h for the fast and slow phases, respectively, in cytoplasmic proteins. These results parallel the behavior of DNA adducts and DNA-protein cross-links, with protein adducts cleared faster than DNA-protein cross-links, and point to the potential utility of N6-formyllysine protein adducts as biomarkers of formaldehyde.
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Affiliation(s)
- Bahar Edrissi
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Koli Taghizadeh
- Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Benjamin C. Moeller
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC, 27514, USA
- Lovelace Respiratory Research Institute, Albuquerque, NM, 87108, USA
| | - Rui Yu
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC, 27514, USA
| | - Dean Kracko
- Lovelace Respiratory Research Institute, Albuquerque, NM, 87108, USA
| | | | - James A. Swenberg
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC, 27514, USA
| | - Peter C. Dedon
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
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110
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Morabito JA, Holman MR, Ding YS, Yan X, Chan M, Chafin D, Perez J, Mendez MI, Cardenas RB, Watson C. The use of charcoal in modified cigarette filters for mainstream smoke carbonyl reduction. Regul Toxicol Pharmacol 2017; 86:117-127. [PMID: 28238852 PMCID: PMC5448414 DOI: 10.1016/j.yrtph.2017.02.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 02/13/2017] [Accepted: 02/20/2017] [Indexed: 11/29/2022]
Abstract
Carbonyls are harmful and potentially harmful constituents (HPHCs) in mainstream cigarette smoke (MSS). Carbonyls, including formaldehyde and acrolein, are carcinogenic or mutagenic in a dose-dependent manner. Past studies demonstrate significant reduction of HPHCs by charcoal filtration. However, limits of charcoal filtration and cigarette design have not yet been investigated in a systematic manner. Objective data is needed concerning the feasibility of HPHC reduction in combustible filtered cigarettes. This systematic study evaluates the effect of charcoal filtration on carbonyl reduction in MSS. We modified filters of ten popular cigarette products with predetermined quantities (100-400 mg) of charcoal in a plug-space-plug configuration. MSS carbonyls, as well as total particulate matter, tar, nicotine, carbon monoxide (TNCO), and draw resistance were quantified. Significant carbonyl reductions were observed across all cigarette products as charcoal loading increased. At the highest charcoal loadings, carbonyls were reduced by nearly 99%. Tar and nicotine decreased modestly (<20%) compared to reductions in carbonyls. Increased draw resistance was significant at only the highest charcoal loadings. This work addresses information gaps in the science base that can inform the evaluation of charcoal filtration as an available technological adaptation to cigarette design which reduces levels of carbonyls in MSS.
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Affiliation(s)
| | | | - Yan S Ding
- Centers for Disease Control and Prevention, United States
| | - Xizheng Yan
- Centers for Disease Control and Prevention, United States
| | - Michele Chan
- Centers for Disease Control and Prevention, United States
| | - Dana Chafin
- Centers for Disease Control and Prevention, United States
| | - Jose Perez
- Centers for Disease Control and Prevention, United States
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111
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Counts J, Weisbrod A, Yin S. Common Diaper Ingredient Questions: Modern Disposable Diaper Materials Are Safe and Extensively Tested. Clin Pediatr (Phila) 2017; 56:23S-27S. [PMID: 28420254 DOI: 10.1177/0009922817706998] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Today's disposable diapers are high-performance and well-tested products, designed to keep skin dry and healthy. They are primarily made of biologically inert polymers, commonly used in fabrics and other materials that are in contact with skin, and in foods and cosmetics. Still, product safety and ingredients in everyday products can be a source of anxiety for new parents. This article provides the facts behind some commonly asked questions from consumers about diaper ingredients and safety, including myths and facts related to chlorine, latex, dyes, and chemical additives.
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Affiliation(s)
| | | | - Shan Yin
- 2 Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
- 3 University of Cincinnati, Cincinnati, OH, USA
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112
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Reinwand DA, Crutzen R, Kienhuis AS, Talhout R, de Vries H. Website Use and Effects of Online Information About Tobacco Additives Among the Dutch General Population: A Randomized Controlled Trial. J Med Internet Res 2017; 19:e60. [PMID: 28292739 PMCID: PMC5373788 DOI: 10.2196/jmir.6785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 12/19/2016] [Accepted: 01/06/2017] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND As a legal obligation, the Dutch government publishes online information about tobacco additives to make sure that it is publicly available. Little is known about the influence this website ("tabakinfo") has on visitors and how the website is evaluated by them. OBJECTIVE This study assesses how visitors use the website and its effect on their knowledge, risk perception, attitude, and smoking behavior. The study will also assess how the website is evaluated by visitors using a sample of the Dutch general population, including smokers and nonsmokers. METHODS A randomized controlled trial was conducted, recruiting participants from an online panel. At baseline, participants (N=672) were asked to fill out an online questionnaire about tobacco additives. Next, participants were randomly allocated to either one of two experimental groups and invited to visit the website providing information about tobacco additives (either with or without a database containing product-specific information) or to a control group that had no access to the website. After 3 months, follow-up measurements took place. RESULTS At follow-up (n=492), no statistically significant differences were found for knowledge, risk perception, attitude, or smoking behavior between the intervention and control groups. Website visits were positively related to younger participants (B=-0.07, 95% CI -0.12 to -0.01; t11=-2.43, P=.02) and having a low risk perception toward tobacco additives (B=-0.32, 95% CI -0.63 to -0.02; t11=-2.07, P=.04). In comparison, having a lower education (B=-0.67, 95% CI -1.14 to -0.17; t11=-2.65, P=.01) was a significant predictor for making less use of the website. Furthermore, the website was evaluated less positively by smokers compared to nonsmokers (t324=-3.55, P<.001), and males compared to females (t324=-2.21, P=.02). CONCLUSIONS The website did not change perceptions of tobacco additives or smoking behavior. Further research is necessary to find out how online information can be used to effectively communication about the risks of tobacco additives. TRIAL REGISTRATION Nederlands Trial Register NTR4620; http://www.trialregister.nl/trialreg/admin/rctview.asp?TC=4620 (Archived by WebCite at http://www.webcitation.org/6oW7w4Gnj).
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Affiliation(s)
- Dominique A Reinwand
- Rehabilitative Gerontology, Faculty of Human Science, University of Cologne, Cologne, Germany
- CAPHRI, Department of Health Promotion, Maastricht University, Maastricht, Netherlands
| | - Rik Crutzen
- CAPHRI, Department of Health Promotion, Maastricht University, Maastricht, Netherlands
| | - Anne S Kienhuis
- Center for Health Protection, National Institute for Public Health and the Environment, Bilthoven, Netherlands
| | - Reinskje Talhout
- Center for Health Protection, National Institute for Public Health and the Environment, Bilthoven, Netherlands
| | - Hein de Vries
- CAPHRI, Department of Health Promotion, Maastricht University, Maastricht, Netherlands
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113
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Regazzoni LG, Grigoryan H, Ji Z, Chen X, Daniels SI, Huang D, Sanchez S, Tang N, Sillé FCM, Iavarone AT, Williams ER, Zhang L, Rappaport SM. Using lysine adducts of human serum albumin to investigate the disposition of exogenous formaldehyde in human blood. Toxicol Lett 2017; 268:26-35. [PMID: 28104429 DOI: 10.1016/j.toxlet.2017.01.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 12/19/2016] [Accepted: 01/04/2017] [Indexed: 12/20/2022]
Abstract
Formaldehyde is a human carcinogen that readily binds to nucleophiles, including proteins and DNA. To investigate whether exogenous formaldehyde produces adducts in extracellular fluids, we characterized modifications to human serum albumin (HSA) following incubation of whole blood, plasma, and saliva with formaldehyde at concentrations of 1, 10 and 100μM. The only HSA locus that showed the presence of formaldehyde modifications was Lys199. A N(6)-Lys adduct with added mass of 12Da, representing a putative intramolecular crosslink, was detected in biological fluids that had been incubated with formaldehyde but not in control fluids. An adduct representing N(6)-Lys formylation was detected in all fluids, but levels did not increase above control values over the tested range of formaldehyde concentrations. An adduct representing N(6)-Lys199 acetylation was also measured in all samples. We then applied the assay to repeated samples of human plasma from 6 nonsmoking volunteer subjects (from Berkeley, CA), and single samples of serum from 15 workers exposed to airborne formaldehyde at about 1.5ppm in a production facility and 15 control workers from Tianjin, China. Although all human plasma/serum samples contained basal levels of the products of N(6)-Lys formylation and acetylation, the putative crosslink product was not detected. Since the putative crosslink was observed in plasma incubated with formaldehyde at 1μM, this suggests that the endogenous concentration of formaldehyde in serum was much lower than reported in the literature. Furthermore, concentrations of the formyl adduct were not higher in workers exposed to formaldehyde at about 1.5ppm than in controls. Follow-up in vitro experiments with gaseous formaldehyde at 1.4ppm detected the putative crosslink in plasma but not whole blood. This combination of results suggests that N(6) formylation occurs within cells with subsequent release of adducted HSA to the systemic circulation. Comparing across human samples, levels of N(6)-Lys199 formyl adducts were present at similar concentrations in subjects from California and China (about 1mmol/mol HSA), but N(6)-Lys199 acetyl adducts were present at higher concentrations in Chinese subjects (0.34 vs. 0.13mmol/mol HSA).
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Affiliation(s)
- Luca G Regazzoni
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, United States
| | - Hasmik Grigoryan
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, United States
| | - Zhiying Ji
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, United States
| | - Xi Chen
- Department of Occupational and Environmental Health, School of Public Health, Tianjin Medical University, Tianjin, China
| | - Sarah I Daniels
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, United States
| | - Deyin Huang
- Institute of Occupational Health, School of Public Health, Tianjin Bohai Chemical Industry Group Co. Ltd., Tianjin, China
| | - Sylvia Sanchez
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, United States
| | - Naijun Tang
- Department of Occupational and Environmental Health, School of Public Health, Tianjin Medical University, Tianjin, China
| | - Fenna C M Sillé
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, United States
| | - Anthony T Iavarone
- California Institute for Quantitative Biosciences and Department of Chemistry, University of California, Berkeley, CA, United States
| | - Evan R Williams
- California Institute for Quantitative Biosciences and Department of Chemistry, University of California, Berkeley, CA, United States
| | - Luoping Zhang
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, United States
| | - Stephen M Rappaport
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, United States.
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114
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Nielsen GD, Larsen ST, Wolkoff P. Re-evaluation of the WHO (2010) formaldehyde indoor air quality guideline for cancer risk assessment. Arch Toxicol 2017; 91:35-61. [PMID: 27209488 PMCID: PMC5225186 DOI: 10.1007/s00204-016-1733-8] [Citation(s) in RCA: 103] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Accepted: 04/27/2016] [Indexed: 11/11/2022]
Abstract
In 2010, the World Health Organization (WHO) established an indoor air quality guideline for short- and long-term exposures to formaldehyde (FA) of 0.1 mg/m3 (0.08 ppm) for all 30-min periods at lifelong exposure. This guideline was supported by studies from 2010 to 2013. Since 2013, new key studies have been published and key cancer cohorts have been updated, which we have evaluated and compared with the WHO guideline. FA is genotoxic, causing DNA adduct formation, and has a clastogenic effect; exposure-response relationships were nonlinear. Relevant genetic polymorphisms were not identified. Normal indoor air FA concentrations do not pass beyond the respiratory epithelium, and therefore FA's direct effects are limited to portal-of-entry effects. However, systemic effects have been observed in rats and mice, which may be due to secondary effects as airway inflammation and (sensory) irritation of eyes and the upper airways, which inter alia decreases respiratory ventilation. Both secondary effects are prevented at the guideline level. Nasopharyngeal cancer and leukaemia were observed inconsistently among studies; new updates of the US National Cancer Institute (NCI) cohort confirmed that the relative risk was not increased with mean FA exposures below 1 ppm and peak exposures below 4 ppm. Hodgkin's lymphoma, not observed in the other studies reviewed and not considered FA dependent, was increased in the NCI cohort at a mean concentration ≥0.6 mg/m3 and at peak exposures ≥2.5 mg/m3; both levels are above the WHO guideline. Overall, the credibility of the WHO guideline has not been challenged by new studies.
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Affiliation(s)
- Gunnar Damgård Nielsen
- National Research Centre for the Working Environment, Lersø Parkallé 105, 2100, Copenhagen, Denmark.
| | - Søren Thor Larsen
- National Research Centre for the Working Environment, Lersø Parkallé 105, 2100, Copenhagen, Denmark
| | - Peder Wolkoff
- National Research Centre for the Working Environment, Lersø Parkallé 105, 2100, Copenhagen, Denmark
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Chiarella P, Tranfo G, Pigini D, Carbonari D. Is it possible to use biomonitoring for the quantitative assessment of formaldehyde occupational exposure? Biomark Med 2016; 10:1287-1303. [PMID: 27924628 DOI: 10.2217/bmm-2016-0146] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The European classification, labeling and packaging classified formaldehyde as human carcinogen Group 1B and mutagen 2, fostering the re-evaluation of the exposure risk in occupational settings. Although formaldehyde exposure is traditionally measured in air, many efforts were made to identify specific exposure biomarkers: urinary formaldehyde, formic acid and DNA damage indicators. Though used in combination, none of these seems satisfactory. The influence of the metabolism on exogenous formaldehyde levels, the exposure to other xenobiotics, the difference in genetic background and metabolism efficiency, misled the relationship between genotoxicity and exposure data. Nevertheless, the limitation of adverse effects to the local contact sites hampers biomonitoring. Here we discuss the feasibility of formaldehyde biomonitoring and the use of DNA, DNA-protein cross-links and protein adducts as potential biomarkers.
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Affiliation(s)
- Pieranna Chiarella
- INAIL Research - Department of Occupational & Environmental Medicine, Epidemiology & Hygiene, Via Fontana Candida 1 - 00078 Monte Porzio Catone (RM), Italy
| | - Giovanna Tranfo
- INAIL Research - Department of Occupational & Environmental Medicine, Epidemiology & Hygiene, Via Fontana Candida 1 - 00078 Monte Porzio Catone (RM), Italy
| | - Daniela Pigini
- INAIL Research - Department of Occupational & Environmental Medicine, Epidemiology & Hygiene, Via Fontana Candida 1 - 00078 Monte Porzio Catone (RM), Italy
| | - Damiano Carbonari
- INAIL Research - Department of Occupational & Environmental Medicine, Epidemiology & Hygiene, Via Fontana Candida 1 - 00078 Monte Porzio Catone (RM), Italy
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116
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Fenech M, Nersesyan A, Knasmueller S. A systematic review of the association between occupational exposure to formaldehyde and effects on chromosomal DNA damage measured using the cytokinesis-block micronucleus assay in lymphocytes. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2016; 770:46-57. [DOI: 10.1016/j.mrrev.2016.04.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 04/09/2016] [Accepted: 04/12/2016] [Indexed: 11/28/2022]
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117
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Bai L, Wyrwalski F, Safariamin M, Bleta R, Lamonier JF, Przybylski C, Monflier E, Ponchel A. Cyclodextrin-cobalt (II) molecule-ion pairs as precursors to active Co3O4/ZrO2 catalysts for the complete oxidation of formaldehyde: Influence of the cobalt source. J Catal 2016. [DOI: 10.1016/j.jcat.2016.07.006] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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118
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Albertini RJ, Kaden DA. Do chromosome changes in blood cells implicate formaldehyde as a leukemogen? Crit Rev Toxicol 2016; 47:145-184. [DOI: 10.1080/10408444.2016.1211987] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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119
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Bogen KT, Heilman JM. Reassessment of MTBE cancer potency considering modes of action for MTBE and its metabolites. Crit Rev Toxicol 2016; 45 Suppl 1:1-56. [PMID: 26414780 DOI: 10.3109/10408444.2015.1052367] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
A 1999 California state agency cancer potency (CP) evaluation of methyl tert-butyl ether (MTBE) assumed linear risk extrapolations from tumor data were plausible because of limited evidence that MTBE or its metabolites could damage DNA, and based such extrapolations on data from rat gavage and rat and mouse inhalation studies indicating elevated tumor rates in male rat kidney, male rat Leydig interstitial cells, and female rat leukemia/lymphomas. More recent data bearing on MTBE cancer potency include a rodent cancer bioassay of MTBE in drinking water; several new studies of MTBE genotoxicity; several similar evaluations of MTBE metabolites, formaldehyde, and tert-butyl alcohol or TBA; and updated evaluations of carcinogenic mode(s) of action (MOAs) of MTBE and MTBE metabolite's. The lymphoma/leukemia data used in the California assessment were recently declared unreliable by the U.S. Environmental Protection Agency (EPA). Updated characterizations of MTBE CP, and its uncertainty, are currently needed to address a variety of decision goals concerning historical and current MTBE contamination. To this end, an extensive review of data sets bearing on MTBE and metabolite genotoxicity, cytotoxicity, and tumorigenicity was applied to reassess MTBE CP and related uncertainty in view of MOA considerations. Adopting the traditional approach that cytotoxicity-driven cancer MOAs are inoperative at very low, non-cytotoxic dose levels, it was determined that MTBE most likely does not increase cancer risk unless chronic exposures induce target-tissue toxicity, including in sensitive individuals. However, the corresponding expected (or plausible upper bound) CP for MTBE conditional on a hypothetical linear (e.g., genotoxic) MOA was estimated to be ∼2 × 10(-5) (or 0.003) per mg MTBE per kg body weight per day for adults exposed chronically over a lifetime. Based on this conservative estimate of CP, if MTBE is carcinogenic to humans, it is among the weakest 10% of chemical carcinogens evaluated by EPA.
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Yan Y, Sun XG, Chen L, Sun LJ, Lu YY, Jiang ZR, Li L, Liu XS. Effect of formaldehyde on miRNA-21 and its downstream proteins TIMP-3 and RECK in the liver. Shijie Huaren Xiaohua Zazhi 2016; 24:2143-2151. [DOI: 10.11569/wcjd.v24.i14.2143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the effect of formaldehyde on miRNA-21 and its downstream proteins tissue inhibitor of metalloproteinase 3 (TIMP-3) and reversion-inducing cysteine-rich protein with Kazal motifs (RECK) in the liver of mice.
METHODS: Forty female Kunming mice were randomly divided into three formaldehyde groups (low-, medium- and high-concentration groups) and a control group. The three formaldehyde groups were intraperitoneally injected with different concentrations of formaldehyde at 10:00 am daily. The control group was injected with equal volume of normal saline. Real-time quantitative PCR (RT-PCR) was used to detect the changes of expression of miRNA-21 after 30 d. Immunohistochemistry and Western blot were used to test the expression of TIMP-3 and RECK in the liver.
RESULTS: The relative expression levels of miRNA-21 in the low-, medium-, and high-concentration groups, compared with that in the control group, were 1.16 ± 0.18, 1.61 ± 0.29 and 2.48 ± 0.49, respectively. There were significant differences in miRNA-21 expression among different groups (F = 38.02, P < 0.0001). The expression values of TIMP-3 in the control group, low-, medium-, and high-concentration groups were 1.30 ± 0.058, 1.04 ± 0.083, 0.85 ± 0.070 and 0.23 ± 0.067, respectively, and there were significant differences among different groups (F = 125.8, P < 0.0001). The expression values of RECK in the control group, low-, medium-, and high-concentration groups were 1.24 ± 0.057, 1.11 ± 0.056, 0.68 ± 0.042 and 0.35 ± 0.066, respectively, and there were also significant differences among different groups (F = 158.7, P < 0.0001). The relative expression of miRNA-21 showed a negative association with expression of TIMP-3 and RECK (r = -0.990, P = 0.01; r = -0.974, P = 0.026, respectively).
CONCLUSION: The expression of miRNA-21 in the liver is significantly increased by formaldehyde in a dose-dependent manner. Formaldehyde can decrease the expression of TIMP-3 and RECK in the same dose-dependent manner.
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121
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Starr TB, Swenberg JA. The bottom-up approach to bounding potential low-dose cancer risks from formaldehyde: An update. Regul Toxicol Pharmacol 2016; 77:167-74. [PMID: 26851508 DOI: 10.1016/j.yrtph.2016.01.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 01/28/2016] [Accepted: 01/29/2016] [Indexed: 10/22/2022]
Abstract
In 2013, we proposed a novel bottom-up approach to bounding low-dose cancer risks that may result from small exogenous exposures to chemicals that are always present in the body as a result of normal biological processes. The approach utilizes the background cancer risk and the background (endogenous) concentration of a cancer-related exposure biomarker in specific target tissues. After allowing for statistical uncertainty in these two parameters, the ratio of the background risk to background exposure provides a conservative slope factor estimate that can be utilized to bound the added risk that may be associated with incremental exogenous exposures. Our original bottom-up estimates were markedly smaller than those obtained previously by the US Environmental Protection Agency (USEPA) with a conventional top-down approach to modeling nasopharyngeal cancer and leukemia mortality data from a US worker cohort. Herein we provide updated bottom-up estimates of risk for these two cancers that are smaller still, and rely upon more robust estimates of endogenous and exogenous formaldehyde-DNA adducts in monkeys and a more robust estimate of the DNA adduct elimination half-life in rats, both obtained very recently. We also re-examine the worker mortality data used by USEPA in developing its estimate of human leukemia incidence from lifetime exposure to 1 ppm airborne formaldehyde. Finally, we compare a new bottom-up slope estimate of the risk of rat nasal cancer with conventional top-down estimates obtained with empirical dose-response modeling of rat nasal cancer bioassay data.
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Affiliation(s)
- Thomas B Starr
- TBS Associates, 7500 Rainwater Road, Raleigh, NC 27615, USA; Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, 166 Rosenau Hall, CB #7431, Chapel Hill, NC 27599-7431, USA.
| | - James A Swenberg
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, 166 Rosenau Hall, CB #7431, Chapel Hill, NC 27599-7431, USA.
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122
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Microbiologically Contaminated and Over-Preserved Cosmetic Products According Rapex 2008–2014. COSMETICS 2016. [DOI: 10.3390/cosmetics3010003] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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123
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Huang HL, Lee WMG, Wu FS. Emissions of air pollutants from indoor charcoal barbecue. JOURNAL OF HAZARDOUS MATERIALS 2016; 302:198-207. [PMID: 26476306 DOI: 10.1016/j.jhazmat.2015.09.048] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Revised: 09/19/2015] [Accepted: 09/22/2015] [Indexed: 06/05/2023]
Abstract
Ten types of commercial charcoal commonly used in Taiwan were investigated to study the potential health effects of air pollutants generated during charcoal combustion in barbecue restaurants. The charcoal samples were combusted in a tubular high-temperature furnace to simulate the high-temperature charcoal combustion in barbecue restaurants. The results indicated that traditional charcoal has higher heating value than green synthetic charcoal. The amount of PM10 and PM2.5 emitted during the smoldering stage increased when the burning temperature was raised. The EF for CO and CO2 fell within the range of 68-300 and 644-1225 g/kg, respectively. Among the charcoals, the lowest EF for PM2.5 and PM10 were found in Binchōtan (B1). Sawdust briquette charcoal (I1S) emitted the smallest amount of carbonyl compounds. Charcoal briquettes (C2S) emitted the largest amount of air pollutants during burning, with the EF for HC, PM2.5, PM10, formaldehyde, and acetaldehyde being the highest among the charcoals studied. The emission of PM2.5, PM10, formaldehyde, and acetaldehyde were 5-10 times those of the second highest charcoal. The results suggest that the adverse effects of the large amounts of air pollutants generated during indoor charcoal combustion on health and indoor air quality must not be ignored.
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Affiliation(s)
- Hsiao-Lin Huang
- Department of Occupational Safety and Health, Chia Nan University of Pharmacy and Science, No. 60, Sec. 1, Er-Ren Rd., Ren-De Dist., Tainan 71710, Taiwan
| | - Whei-May Grace Lee
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei 106, Taiwan.
| | - Feng-Shu Wu
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei 106, Taiwan
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124
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Klapacz J, Pottenger LH, Engelward BP, Heinen CD, Johnson GE, Clewell RA, Carmichael PL, Adeleye Y, Andersen ME. Contributions of DNA repair and damage response pathways to the non-linear genotoxic responses of alkylating agents. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2015; 767:77-91. [PMID: 27036068 DOI: 10.1016/j.mrrev.2015.11.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 11/26/2015] [Accepted: 11/27/2015] [Indexed: 11/27/2022]
Abstract
From a risk assessment perspective, DNA-reactive agents are conventionally assumed to have genotoxic risks at all exposure levels, thus applying a linear extrapolation for low-dose responses. New approaches discussed here, including more diverse and sensitive methods for assessing DNA damage and DNA repair, strongly support the existence of measurable regions where genotoxic responses with increasing doses are insignificant relative to control. Model monofunctional alkylating agents have in vitro and in vivo datasets amenable to determination of points of departure (PoDs) for genotoxic effects. A session at the 2013 Society of Toxicology meeting provided an opportunity to survey the progress in understanding the biological basis of empirically-observed PoDs for DNA alkylating agents. Together with the literature published since, this review discusses cellular pathways activated by endogenous and exogenous alkylation DNA damage. Cells have evolved conserved processes that monitor and counteract a spontaneous steady-state level of DNA damage. The ubiquitous network of DNA repair pathways serves as the first line of defense for clearing of the DNA damage and preventing mutation. Other biological pathways discussed here that are activated by genotoxic stress include post-translational activation of cell cycle networks and transcriptional networks for apoptosis/cell death. The interactions of various DNA repair and DNA damage response pathways provide biological bases for the observed PoD behaviors seen with genotoxic compounds. Thus, after formation of DNA adducts, the activation of cellular pathways can lead to the avoidance of a mutagenic outcome. The understanding of the cellular mechanisms acting within the low-dose region will serve to better characterize risks from exposures to DNA-reactive agents at environmentally-relevant concentrations.
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Affiliation(s)
- Joanna Klapacz
- Toxicology & Environmental Research and Consulting, The Dow Chemical Company, Midland, MI 48674, USA.
| | - Lynn H Pottenger
- Toxicology & Environmental Research and Consulting, The Dow Chemical Company, Midland, MI 48674, USA; Current Address: Olin Corporation, Midland, MI 48674, USA
| | - Bevin P Engelward
- Department of Biological Engineering, MA Institute of Technology, Cambridge, MA 02139, USA
| | - Christopher D Heinen
- Center for Molecular Medicine, Neag Comprehensive Cancer Center, University of CT Health Center, Farmington, CT 06030, USA
| | - George E Johnson
- Institute of Life Science, College of Medicine, Swansea University, SA2 8PP, UK
| | - Rebecca A Clewell
- Hamner Institutes for Health Sciences, Research Triangle Park, NC 27709, USA
| | - Paul L Carmichael
- Unilever, Safety & Environmental Assurance Centre, Colworth Science Park, Sharnbrook, Bedfordshire MK44 1LQ, UK
| | - Yeyejide Adeleye
- Unilever, Safety & Environmental Assurance Centre, Colworth Science Park, Sharnbrook, Bedfordshire MK44 1LQ, UK
| | - Melvin E Andersen
- Hamner Institutes for Health Sciences, Research Triangle Park, NC 27709, USA
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125
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Rhomberg LR. Contrasting directions and directives on hazard identification for formaldehyde carcinogenicity. Regul Toxicol Pharmacol 2015; 73:829-33. [PMID: 26493002 DOI: 10.1016/j.yrtph.2015.10.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 10/15/2015] [Indexed: 01/07/2023]
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126
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Choi JH, Kim SY, Kim SK, Kemp MG, Sancar A. An Integrated Approach for Analysis of the DNA Damage Response in Mammalian Cells: NUCLEOTIDE EXCISION REPAIR, DNA DAMAGE CHECKPOINT, AND APOPTOSIS. J Biol Chem 2015; 290:28812-21. [PMID: 26438822 DOI: 10.1074/jbc.m115.690354] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Indexed: 11/06/2022] Open
Abstract
DNA damage by UV and UV-mimetic agents elicits a set of inter-related responses in mammalian cells, including DNA repair, DNA damage checkpoints, and apoptosis. Conventionally, these responses are analyzed separately using different methodologies. Here we describe a unified approach that is capable of quantifying all three responses in parallel using lysates from the same population of cells. We show that a highly sensitive in vivo excision repair assay is capable of detecting nucleotide excision repair of a wide spectrum of DNA lesions (UV damage, chemical carcinogens, and chemotherapeutic drugs) within minutes of damage induction. This method therefore allows for a real-time measure of nucleotide excision repair activity that can be monitored in conjunction with other components of the DNA damage response, including DNA damage checkpoint and apoptotic signaling. This approach therefore provides a convenient and reliable platform for simultaneously examining multiple aspects of the DNA damage response in a single population of cells that can be applied for a diverse array of carcinogenic and chemotherapeutic agents.
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Affiliation(s)
- Jun-Hyuk Choi
- From the Center for Bioanalysis, Department of Metrology for Quality of Life, Korea Research Institute of Standards and Science, Daejeon 305-340, South Korea, the Department of Bio-Analytical Science, University of Science & Technology, Daejeon 305-350, South Korea, and
| | - So-Young Kim
- From the Center for Bioanalysis, Department of Metrology for Quality of Life, Korea Research Institute of Standards and Science, Daejeon 305-340, South Korea
| | - Sook-Kyung Kim
- From the Center for Bioanalysis, Department of Metrology for Quality of Life, Korea Research Institute of Standards and Science, Daejeon 305-340, South Korea, the Department of Bio-Analytical Science, University of Science & Technology, Daejeon 305-350, South Korea, and
| | - Michael G Kemp
- the Department of Biochemistry and Biophysics, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599-7260
| | - Aziz Sancar
- the Department of Biochemistry and Biophysics, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599-7260
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127
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Pontel LB, Rosado IV, Burgos-Barragan G, Garaycoechea JI, Yu R, Arends MJ, Chandrasekaran G, Broecker V, Wei W, Liu L, Swenberg JA, Crossan GP, Patel KJ. Endogenous Formaldehyde Is a Hematopoietic Stem Cell Genotoxin and Metabolic Carcinogen. Mol Cell 2015; 60:177-88. [PMID: 26412304 PMCID: PMC4595711 DOI: 10.1016/j.molcel.2015.08.020] [Citation(s) in RCA: 259] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 07/10/2015] [Accepted: 08/21/2015] [Indexed: 12/18/2022]
Abstract
Endogenous formaldehyde is produced by numerous biochemical pathways fundamental to life, and it can crosslink both DNA and proteins. However, the consequences of its accumulation are unclear. Here we show that endogenous formaldehyde is removed by the enzyme alcohol dehydrogenase 5 (ADH5/GSNOR), and Adh5(-/-) mice therefore accumulate formaldehyde adducts in DNA. The repair of this damage is mediated by FANCD2, a DNA crosslink repair protein. Adh5(-/-)Fancd2(-/-) mice reveal an essential requirement for these protection mechanisms in hematopoietic stem cells (HSCs), leading to their depletion and precipitating bone marrow failure. More widespread formaldehyde-induced DNA damage also causes karyomegaly and dysfunction of hepatocytes and nephrons. Bone marrow transplantation not only rescued hematopoiesis but, surprisingly, also preserved nephron function. Nevertheless, all of these animals eventually developed fatal malignancies. Formaldehyde is therefore an important source of endogenous DNA damage that is counteracted in mammals by a conserved protection mechanism.
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Affiliation(s)
- Lucas B Pontel
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK
| | - Ivan V Rosado
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK; Instituto de Biomedicina de Sevilla (IBiS) Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, 41013 Seville, Spain
| | | | - Juan I Garaycoechea
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK
| | - Rui Yu
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Mark J Arends
- University of Edinburgh Division of Pathology, Edinburgh Cancer Research Centre, Institute of Genetics & Molecular Medicine, Western General Hospital, Crewe Road South, Edinburgh EH4 2XR, UK
| | | | - Verena Broecker
- Department of Histopathology, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, University of Cambridge, Hills Road, Cambridge CB2 2QQ, UK
| | - Wei Wei
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Limin Liu
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - James A Swenberg
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Gerry P Crossan
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK
| | - Ketan J Patel
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK; Department of Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge CB2 2QQ, UK.
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128
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Silveira JEPS, Pereda MCV, Nogueira C, Dieamant G, Cesar CKM, Assanome KM, Silva MS, Torello CO, Queiroz MLS, Eberlin S. Preliminary safety assessment of C-8 xylitol monoester and xylitol phosphate esters. Int J Cosmet Sci 2015; 38:41-51. [PMID: 26193758 DOI: 10.1111/ics.12262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 06/10/2015] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Most of the cosmetic compounds with preservative properties available in the market pose some risks concerning safety, such as the possibility of causing sensitization. Due to the fact that there are few options, the proper development of new molecules with this purpose is needed. Xylitol is a natural sugar, and the antimicrobial properties of xylitol-derived compounds have already been described in the literature. C-8 xylitol monoester and xylitol phosphate esters may be useful for the development of skincare products. As an initial screen for safety of chemicals, the combination of in silico methods and in vitro testing can aid in prioritizing resources in toxicological investigations while reducing the ethical and monetary costs that are related to animal and human testing. This study was designed to evaluate the safety of C-8 xylitol monoester and xylitol phosphate esters regarding carcinogenicity, mutagenicity, skin and eye irritation/corrosion and sensitization through alternative methods. METHODS For the initial safety assessment, quantitative structure-activity relationship methodology was used. The prediction of the parameters carcinogenicity/mutagenicity, skin and eye irritation/corrosion and sensitization was generated from the chemical structure. The analysis also comprised physical-chemical properties, Cramer rules, threshold of toxicological concern and Michael reaction. In silico results of candidate molecules were compared to 19 compounds with preservative properties that are available in the market. Additionally, in vitro tests (Ames test for mutagenicity, cytotoxicity and phototoxicity tests and hen's egg test--chorioallantoic membrane for irritation) were performed to complement the evaluation. RESULTS In silico evaluation of both molecules presented no structural alerts related to eye and skin irritation, corrosion and sensitization, but some alerts for micronucleus and carcinogenicity were detected. However, by comparison, C-8 xylitol monoester, xylitol phosphate esters showed similar or better results than the compounds available in the market. Concerning experimental data, phototoxicity and mutagenicity results were negative. As expected for compounds with preservative activity, xylitol-derived substances presented positive result in cytotoxicity test. In hen's egg test, both molecules were irritants. CONCLUSION Our results suggested that xylitol-derived compounds appear to be suitable candidates for preservative systems in cosmetics.
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Affiliation(s)
- J E P S Silveira
- Department of Pharmacology/Hemocenter, Faculty of Medical Science, State University of Campinas (Unicamp), Campinas, SP, Brazil
| | - M C V Pereda
- Research and Development Department, Chemyunion Química Ltda, Sorocaba, SP, Brazil
| | - C Nogueira
- Research and Development Department, Chemyunion Química Ltda, Sorocaba, SP, Brazil
| | - G Dieamant
- Department of Pharmacology/Hemocenter, Faculty of Medical Science, State University of Campinas (Unicamp), Campinas, SP, Brazil
| | - C K M Cesar
- Research and Development Department, Chemyunion Química Ltda, Sorocaba, SP, Brazil
| | | | - M S Silva
- Department of Pharmacology/Hemocenter, Faculty of Medical Science, State University of Campinas (Unicamp), Campinas, SP, Brazil
| | - C O Torello
- Department of Pharmacology/Hemocenter, Faculty of Medical Science, State University of Campinas (Unicamp), Campinas, SP, Brazil
| | - M L S Queiroz
- Department of Pharmacology/Hemocenter, Faculty of Medical Science, State University of Campinas (Unicamp), Campinas, SP, Brazil
| | - S Eberlin
- Department of Pharmacology/Hemocenter, Faculty of Medical Science, State University of Campinas (Unicamp), Campinas, SP, Brazil
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129
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Yu R, Lai Y, Hartwell HJ, Moeller BC, Doyle-Eisele M, Kracko D, Bodnar WM, Starr TB, Swenberg JA. Formation, Accumulation, and Hydrolysis of Endogenous and Exogenous Formaldehyde-Induced DNA Damage. Toxicol Sci 2015; 146:170-82. [PMID: 25904104 PMCID: PMC4476463 DOI: 10.1093/toxsci/kfv079] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Formaldehyde is not only a widely used chemical with well-known carcinogenicity but is also a normal metabolite of living cells. It thus poses unique challenges for understanding risks associated with exposure. N(2-)hydroxymethyl-dG (N(2)-HOMe-dG) is the main formaldehyde-induced DNA mono-adduct, which together with DNA-protein crosslinks (DPCs) and toxicity-induced cell proliferation, play important roles in a mutagenic mode of action for cancer. In this study, N(2)-HOMe-dG was shown to be an excellent biomarker for direct adduction of formaldehyde to DNA and the hydrolysis of DPCs. The use of inhaled [(13)CD2]-formaldehyde exposures of rats and primates coupled with ultrasensitive nano ultra performance liquid chromatography-tandem mass spectrometry permitted accurate determinations of endogenous and exogenous formaldehyde DNA damage. The results show that inhaled formaldehyde only reached rat and monkey noses, but not tissues distant to the site of initial contact. The amounts of exogenous adducts were remarkably lower than those of endogenous adducts in exposed nasal epithelium. Moreover, exogenous adducts accumulated in rat nasal epithelium over the 28-days exposure to reach steady-state concentrations, followed by elimination with a half-life (t1/2) of 7.1 days. Additionally, we examined artifact formation during DNA preparation to ensure the accuracy of nonlabeled N(2)-HOMe-dG measurements. These novel findings provide critical new data for understanding major issues identified by the National Research Council Review of the 2010 Environmental Protection Agency's Draft Integrated Risk Information System Formaldehyde Risk Assessment. They support a data-driven need for reflection on whether risks have been overestimated for inhaled formaldehyde, whereas underappreciating endogenous formaldehyde as the primary source of exposure that results in bone marrow toxicity and leukemia in susceptible humans and rodents deficient in DNA repair.
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Affiliation(s)
- Rui Yu
- *Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina, Chapel Hill, North Carolina 27599
| | - Yongquan Lai
- *Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina, Chapel Hill, North Carolina 27599
| | - Hadley J Hartwell
- *Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina, Chapel Hill, North Carolina 27599
| | - Benjamin C Moeller
- Lovelace Respiratory Research Institute, Albuquerque, New Mexico 87108; and
| | | | - Dean Kracko
- Lovelace Respiratory Research Institute, Albuquerque, New Mexico 87108; and
| | - Wanda M Bodnar
- *Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina, Chapel Hill, North Carolina 27599
| | - Thomas B Starr
- *Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina, Chapel Hill, North Carolina 27599, TBS Associates, 7500 Rainwater Road, Raleigh, North Carolina 27615
| | - James A Swenberg
- *Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina, Chapel Hill, North Carolina 27599,
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130
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Dorokhov YL, Shindyapina AV, Sheshukova EV, Komarova TV. Metabolic methanol: molecular pathways and physiological roles. Physiol Rev 2015; 95:603-44. [PMID: 25834233 DOI: 10.1152/physrev.00034.2014] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Methanol has been historically considered an exogenous product that leads only to pathological changes in the human body when consumed. However, in normal, healthy individuals, methanol and its short-lived oxidized product, formaldehyde, are naturally occurring compounds whose functions and origins have received limited attention. There are several sources of human physiological methanol. Fruits, vegetables, and alcoholic beverages are likely the main sources of exogenous methanol in the healthy human body. Metabolic methanol may occur as a result of fermentation by gut bacteria and metabolic processes involving S-adenosyl methionine. Regardless of its source, low levels of methanol in the body are maintained by physiological and metabolic clearance mechanisms. Although human blood contains small amounts of methanol and formaldehyde, the content of these molecules increases sharply after receiving even methanol-free ethanol, indicating an endogenous source of the metabolic methanol present at low levels in the blood regulated by a cluster of genes. Recent studies of the pathogenesis of neurological disorders indicate metabolic formaldehyde as a putative causative agent. The detection of increased formaldehyde content in the blood of both neurological patients and the elderly indicates the important role of genetic and biochemical mechanisms of maintaining low levels of methanol and formaldehyde.
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Affiliation(s)
- Yuri L Dorokhov
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow, Russia; and N. I. Vavilov Institute of General Genetics, Russian Academy of Science, Moscow, Russia
| | - Anastasia V Shindyapina
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow, Russia; and N. I. Vavilov Institute of General Genetics, Russian Academy of Science, Moscow, Russia
| | - Ekaterina V Sheshukova
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow, Russia; and N. I. Vavilov Institute of General Genetics, Russian Academy of Science, Moscow, Russia
| | - Tatiana V Komarova
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow, Russia; and N. I. Vavilov Institute of General Genetics, Russian Academy of Science, Moscow, Russia
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131
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Faghani M, Kohestani Y, Nasiri E, Moladoust H, Mesbah M. Protective Effect of Vitamin E on Formaldehyde-Induced Injuries in the Rat Kidney. ACTA ACUST UNITED AC 2014. [DOI: 10.17795/gct-21539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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132
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Pedersen RNF, Jepsen JR, Ádám B. Regulation and practice of workers’ protection from chemical exposures during container handling. J Occup Med Toxicol 2014. [DOI: 10.1186/s12995-014-0033-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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133
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Nakamura J, Mutlu E, Sharma V, Collins L, Bodnar W, Yu R, Lai Y, Moeller B, Lu K, Swenberg J. The endogenous exposome. DNA Repair (Amst) 2014; 19:3-13. [PMID: 24767943 PMCID: PMC4097170 DOI: 10.1016/j.dnarep.2014.03.031] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The concept of the Exposome is a compilation of diseases and one's lifetime exposure to chemicals, whether the exposure comes from environmental, dietary, or occupational exposures; or endogenous chemicals that are formed from normal metabolism, inflammation, oxidative stress, lipid peroxidation, infections, and other natural metabolic processes such as alteration of the gut microbiome. In this review, we have focused on the endogenous exposome, the DNA damage that arises from the production of endogenous electrophilic molecules in our cells. It provides quantitative data on endogenous DNA damage and its relationship to mutagenesis, with emphasis on when exogenous chemical exposures that produce identical DNA adducts to those arising from normal metabolism cause significant increases in total identical DNA adducts. We have utilized stable isotope labeled chemical exposures of animals and cells, so that accurate relationships between endogenous and exogenous exposures can be determined. Advances in mass spectrometry have vastly increased both the sensitivity and accuracy of such studies. Furthermore, we have clear evidence of which sources of exposure drive low dose biology that results in mutations and disease. These data provide much needed information to impact quantitative risk assessments, in the hope of moving towards the use of science, rather than default assumptions.
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Affiliation(s)
- Jun Nakamura
- University of North Carolina, Chapel Hill, NC, United States
| | - Esra Mutlu
- University of North Carolina, Chapel Hill, NC, United States
| | - Vyom Sharma
- University of North Carolina, Chapel Hill, NC, United States
| | - Leonard Collins
- University of North Carolina, Chapel Hill, NC, United States
| | - Wanda Bodnar
- University of North Carolina, Chapel Hill, NC, United States
| | - Rui Yu
- University of North Carolina, Chapel Hill, NC, United States
| | - Yongquan Lai
- University of North Carolina, Chapel Hill, NC, United States
| | - Benjamin Moeller
- University of North Carolina, Chapel Hill, NC, United States; Lovelace Respiratory Research Institute, Albuquerque, NM, United States
| | - Kun Lu
- University of North Carolina, Chapel Hill, NC, United States
| | - James Swenberg
- University of North Carolina, Chapel Hill, NC, United States.
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134
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Central nervous system toxicity after acute oral formaldehyde exposure in rabbits. Hum Exp Toxicol 2014; 33:1141-9. [DOI: 10.1177/0960327113514098] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Formaldehyde (FA) is one of the most widely used chemical compounds in industrial field. It is described as toxic, particularly to the nervous system, the urogenital system, and the respiratory tracts. In this study, we determined the effects of acute oral exposure to FA in rabbit brain tissue. A total of 16 rabbits were selected and divided into 2 groups: formaldehyde group (group F) and control group (group C). FA was administered to group F at a rate of 40 mg/kg/day via a nasogastric tube for 5 days. Saline was similarly administered to the eight controls. All the animals were euthanized after 5 days of exposure, and brain tissue samples were collected in 10% neutral formalin and embedded in paraffin. To investigate the effects of FA on the apoptotic process, we examined active caspase-3, Bax, and Bcl-2 immunohistochemical expression and terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate –biotin nick-end labeling (TUNEL) reactivity in the rabbit brains. In addition, glial fibrillary acidic protein (GFAP) was biochemically assessed in brain tissue samples for neurotoxicity. We found that FA treatment caused a significant decrease in Bcl-2 expression and an increase in active caspase-3 and Bax expressions as well as an increase in the number of TUNEL-positive apoptotic cells. The GFAP level was found to be significantly higher in group F. In conclusion, acute oral exposure to FA caused DNA damage, apoptosis, and neuronal injury in the rabbit brains.
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135
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Peluso MEM, Munnia A, Tarocchi M, Giese RW, Annaratone L, Bussolati G, Bono R. Oxidative DNA damage and formalin-fixation procedures. Toxicol Res (Camb) 2014. [DOI: 10.1039/c4tx00046c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
An experimental study on how formaldehyde-fixation is capable of inducing excess oxidative DNA damage in formalin-fixed paraffin-embedded tissues.
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Affiliation(s)
- Marco E. M. Peluso
- Cancer Risk Factor Branch
- Cancer Prevention and Research Institute
- Florence, Italy
| | - Armelle Munnia
- Cancer Risk Factor Branch
- Cancer Prevention and Research Institute
- Florence, Italy
| | - Mirko Tarocchi
- Department of Experimental and Clinical Biomedical Sciences
- University of Florence
- Florence, Italy
| | - Roger W. Giese
- Department of Pharmaceutical Sciences in the Bouve College of Health Sciences
- Barnett Institute
- Northeastern University
- Boston, USA
| | | | | | - Roberto Bono
- Department of Public Health and Pediatry
- University of Turin
- Turin, Italy
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136
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Rager JE, Moeller BC, Miller SK, Kracko D, Doyle-Eisele M, Swenberg JA, Fry RC. Formaldehyde-associated changes in microRNAs: tissue and temporal specificity in the rat nose, white blood cells, and bone marrow. Toxicol Sci 2013; 138:36-46. [PMID: 24304932 DOI: 10.1093/toxsci/kft267] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
MicroRNAs (miRNAs) are critical regulators of gene expression, yet much remains unknown regarding their changes resulting from environmental exposures as they influence cellular signaling across various tissues. We set out to investigate miRNA responses to formaldehyde, a critical air pollutant and known carcinogen that disrupts miRNA expression profiles. Rats were exposed by inhalation to either 0 or 2 ppm formaldehyde for 7, 28, or 28 days followed by a 7-day recovery. Genome-wide miRNA expression profiles were assessed within the nasal respiratory epithelium, circulating white blood cells (WBC), and bone marrow (BM). miRNAs showed altered expression in the nose and WBC but not in the BM. Notably in the nose, miR-10b and members of the let-7 family, known nasopharyngeal carcinoma players, showed decreased expression. To integrate miRNA responses with transcriptional changes, genome-wide messenger RNA profiles were assessed in the nose and WBC. Although formaldehyde-induced changes in miRNA and transcript expression were largely tissue specific, pathway analyses revealed an enrichment of immune system/inflammation signaling in the nose and WBC. Specific to the nose was enrichment for apoptosis/proliferation signaling, involving let-7a, let-7c, and let-7f. Across all tissues and time points assessed, miRNAs were predicted to regulate between 7% and 35% of the transcriptional responses and were suggested to play a role in signaling processes including immune/inflammation-related pathways. These data inform our current hypothesis that formaldehyde-induced inflammatory signals originating in the nose may drive WBC effects.
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Affiliation(s)
- Julia E Rager
- * Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina, Chapel Hill, North Carolina 27599
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137
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Edrissi B, Taghizadeh K, Moeller BC, Kracko D, Doyle-Eisele M, Swenberg JA, Dedon PC. Dosimetry of N⁶-formyllysine adducts following [¹³C²H₂]-formaldehyde exposures in rats. Chem Res Toxicol 2013; 26:1421-3. [PMID: 24087891 PMCID: PMC3805309 DOI: 10.1021/tx400320u] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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With formaldehyde as the major source
of endogenous N6-formyllysine protein
adducts, we quantified endogenous
and exogenous N6-formyllysine in the nasal
epithelium of rats exposed by inhalation to 0.7, 2, 5.8, and 9.1 ppm
[13C2H2]-formaldehyde using liquid
chromatography-coupled tandem mass spectrometry. Exogenous N6-formyllysine was detected in the nasal epithelium,
with concentration-dependent formation in total as well as fractionated
(cytoplasmic, membrane, nuclear) proteins, but was not detected in
the lung, liver, or bone marrow. Endogenous adducts dominated at all
exposure conditions, with a 6 h 9.1 ppm formaldehyde exposure resulting
in one-third of the total load of N6-formyllysine
being derived from exogenous sources. The results parallel previous
studies of formaldehyde-induced DNA adducts.
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Affiliation(s)
- Bahar Edrissi
- Department of Biological Engineering, ‡Center for Environmental Health Sciences, Massachusetts Institute of Technology , Cambridge, Massachusetts, 02139, United States
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