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Judson RS, Smith D, DeVito M, Wambaugh JF, Wetmore BA, Paul Friedman K, Patlewicz G, Thomas RS, Sayre RR, Olker JH, Degitz S, Padilla S, Harrill JA, Shafer T, Carstens KE. A Comparison of In Vitro Points of Departure with Human Blood Levels for Per- and Polyfluoroalkyl Substances (PFAS). TOXICS 2024; 12:271. [PMID: 38668494 PMCID: PMC11053643 DOI: 10.3390/toxics12040271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 03/29/2024] [Accepted: 03/30/2024] [Indexed: 04/29/2024]
Abstract
Per- and polyfluoroalkyl substances (PFAS) are widely used, and their fluorinated state contributes to unique uses and stability but also long half-lives in the environment and humans. PFAS have been shown to be toxic, leading to immunosuppression, cancer, and other adverse health outcomes. Only a small fraction of the PFAS in commerce have been evaluated for toxicity using in vivo tests, which leads to a need to prioritize which compounds to examine further. Here, we demonstrate a prioritization approach that combines human biomonitoring data (blood concentrations) with bioactivity data (concentrations at which bioactivity is observed in vitro) for 31 PFAS. The in vitro data are taken from a battery of cell-based assays, mostly run on human cells. The result is a Bioactive Concentration to Blood Concentration Ratio (BCBCR), similar to a margin of exposure (MoE). Chemicals with low BCBCR values could then be prioritized for further risk assessment. Using this method, two of the PFAS, PFOA (Perfluorooctanoic Acid) and PFOS (Perfluorooctane Sulfonic Acid), have BCBCR values < 1 for some populations. An additional 9 PFAS have BCBCR values < 100 for some populations. This study shows a promising approach to screening level risk assessments of compounds such as PFAS that are long-lived in humans and other species.
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Affiliation(s)
- Richard S. Judson
- US Environmental Protection Agency, Research Triangle Park, NC 27711, USA; (D.S.); (M.D.); (J.F.W.); (B.A.W.); (K.P.F.); (G.P.); (R.S.T.); (R.R.S.); (J.H.O.); (S.D.); (S.P.); (J.A.H.); (T.S.); (K.E.C.)
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Pilz F, Gärtner A, Pluym N, Scherer G, Scherer M. A sensitive GC-MS/MS method for the quantification of benzo[a]pyrene tetrol in urine. Anal Bioanal Chem 2024:10.1007/s00216-024-05233-9. [PMID: 38459968 DOI: 10.1007/s00216-024-05233-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 02/27/2024] [Indexed: 03/11/2024]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous pollutants formed during the incomplete combustion of organic matter such as tobacco. Among these, benzo[a]pyrene (BaP) has been classified as a known carcinogen to humans. It unfolds its effect through metabolic activation to BaP-(7R,8S)-diol-(9S,10R)-epoxide (BPDE), the ultimate carcinogen of BaP. In this article, we describe a simple and highly sensitive GC-NICI-MS/MS method for the quantification of urinary BaP-(7R,8S,9R,10S)-tetrol (( +)-BPT I-1), the hydrolysis product of BPDE. The method was validated and showed excellent results in terms of accuracy, precision, and sensitivity (lower limit of quantification (LLOQ): 50 pg/L). In urine samples derived from users of tobacco/nicotine products and non-users, only consumption of combustible cigarettes was associated with a significant increase in BPT I-1 concentrations (0.023 ± 0.016 nmol/mol creatinine, p < 0.001). Levels of users of potentially reduced-risk products as well as non-users were all below the LLOQ. In addition, the urine levels of six occupationally exposed workers were analyzed and showed the highest overall concentrations of BPT I-1 (844.2 ± 336.7 pg/L). Moreover, comparison with concentrations of 3-hydroxybenzo[a]pyrene (3-OH-BaP), the major detoxification product of BaP oxidation, revealed higher levels of 3-OH-BaP than BPT I-1 in almost all study subjects. Despite the lower levels, BPT I-1 can provide more relevant information on an individual's cancers susceptibility since BPDE is generated by the metabolic activation of BaP. In conclusion, BPT I-1 is a suitable biomarker to distinguish not only cigarette smokers from non-smokers but also from users of potentially reduced-risk products.
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Affiliation(s)
- Fabian Pilz
- ABF, Analytisch-Biologisches Forschungslabor GmbH, Semmelweisstr, 5, 82152, Planegg, Germany
| | - Antonia Gärtner
- ABF, Analytisch-Biologisches Forschungslabor GmbH, Semmelweisstr, 5, 82152, Planegg, Germany
| | - Nikola Pluym
- ABF, Analytisch-Biologisches Forschungslabor GmbH, Semmelweisstr, 5, 82152, Planegg, Germany
| | - Gerhard Scherer
- ABF, Analytisch-Biologisches Forschungslabor GmbH, Semmelweisstr, 5, 82152, Planegg, Germany
| | - Max Scherer
- ABF, Analytisch-Biologisches Forschungslabor GmbH, Semmelweisstr, 5, 82152, Planegg, Germany.
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Ashley DL, Zhu W, Bhandari D, Wang L, Feng J, Wang Y, Meng L, Xia B, Jarrett JM, Chang CM, Kimmel HL, Blount BC. Influence of Half-life and Smoking/Nonsmoking Ratio on Biomarker Consistency between Waves 1 and 2 of the Population Assessment of Tobacco and Health Study. Cancer Epidemiol Biomarkers Prev 2024; 33:80-87. [PMID: 37823832 PMCID: PMC10843274 DOI: 10.1158/1055-9965.epi-23-0538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/05/2023] [Accepted: 10/10/2023] [Indexed: 10/13/2023] Open
Abstract
BACKGROUND Biomarkers of exposure are tools for understanding the impact of tobacco use on health outcomes if confounders like demographics, use behavior, biological half-life, and other sources of exposure are accounted for in the analysis. METHODS We performed multiple regression analysis of longitudinal measures of urinary biomarkers of alkaloids, tobacco-specific nitrosamines, polycyclic aromatic hydrocarbons, volatile organic compounds (VOC), and metals to examine the sample-to-sample consistency in Waves 1 and 2 of the Population Assessment of Tobacco and Health (PATH) Study including demographic characteristics and use behavior variables of persons who smoked exclusively. Regression coefficients, within- and between-person variance, and intra-class correlation coefficients (ICC) were compared with biomarker smoking/nonsmoking population mean ratios and biological half-lives. RESULTS Most biomarkers were similarly associated with sex, age, race/ethnicity, and product use behavior. The biomarkers with larger smoking/nonsmoking population mean ratios had greater regression coefficients related to recency of exposure. For VOC and alkaloid metabolites, longer biological half-life was associated with lower within-person variance. For each chemical class studied, there were biomarkers that demonstrated good ICCs. CONCLUSIONS For most of the biomarkers of exposure reported in the PATH Study, for people who smoke cigarettes exclusively, associations are similar between urinary biomarkers of exposure and demographic and use behavior covariates. Biomarkers of exposure within-subject consistency is likely associated with nontobacco sources of exposure and biological half-life. IMPACT Biomarkers measured in the PATH Study provide consistent sample-to-sample measures from which to investigate the association of adverse health outcomes with the characteristics of cigarettes and their use.
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Affiliation(s)
- David L. Ashley
- School of Public Health, Georgia State University, Atlanta, GA
| | - Wanzhe Zhu
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA
| | - Deepak Bhandari
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA
| | - Lanqing Wang
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA
| | - Jun Feng
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA
| | - Yuesong Wang
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA
| | - Lei Meng
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA
| | - Baoyun Xia
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA
| | - Jeffery M. Jarrett
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA
| | - Cindy M. Chang
- Center for Tobacco Products, U.S. Food and Drug Administration, Silver Spring, MD
| | - Heather L. Kimmel
- National Institute for Drug Abuse, National Institutes of Health, Bethesda, MD
| | - Benjamin C. Blount
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA
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Stanfield Z, Setzer RW, Hull V, Sayre RR, Isaacs KK, Wambaugh JF. Characterizing Chemical Exposure Trends from NHANES Urinary Biomonitoring Data. ENVIRONMENTAL HEALTH PERSPECTIVES 2024; 132:17009. [PMID: 38285237 PMCID: PMC10824265 DOI: 10.1289/ehp12188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 10/19/2023] [Accepted: 12/12/2023] [Indexed: 01/30/2024]
Abstract
BACKGROUND Xenobiotic metabolites are widely present in human urine and can indicate recent exposure to environmental chemicals. Proper inference of which chemicals contribute to these metabolites can inform human exposure and risk. Furthermore, longitudinal biomonitoring studies provide insight into how chemical exposures change over time. OBJECTIVES We constructed an exposure landscape for as many human-exposure relevant chemicals over as large a time span as possible to characterize exposure trends across demographic groups and chemical types. METHODS We analyzed urine data of nine 2-y cohorts (1999-2016) from the National Health and Nutrition Examination Survey (NHANES). Chemical daily intake rates (in milligrams per kilogram bodyweight per day) were inferred, using the R package bayesmarker, from metabolite concentrations in each cohort individually to identify exposure trends. Trends for metabolites and parents were clustered to find chemicals with similar exposure patterns. Exposure variation by age, gender, and body mass index were also assessed. RESULTS Intake rates for 179 parent chemicals were inferred from 151 metabolites (96 measured in five or more cohorts). Seventeen metabolites and 44 parent chemicals exhibited fold-changes ≥ 10 between any two cohorts (deltamethrin, di-n -octyl phthalate, and di-isononyl phthalate had the greatest exposure increases). Di-2-ethylhexyl phthalate intake began decreasing in 2007, whereas both di-isobutyl and di-isononyl phthalate began increasing shortly before. Intake for four parabens was markedly higher in females, especially reproductive-age females, compared with males and children. Cadmium and arsenobetaine exhibited higher exposure for individuals > 65 years of age and lower for individuals < 20 years of age. DISCUSSION With appropriate analysis, NHANES indicates trends in chemical exposures over the past two decades. Decreases in exposure are observable as the result of regulatory action, with some being accompanied by increases in replacement chemicals. Age- and gender-specific variations in exposure were observed for multiple chemicals. Continued estimation of demographic-specific exposures is needed to both monitor and identify potential vulnerable populations. https://doi.org/10.1289/EHP12188.
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Affiliation(s)
- Zachary Stanfield
- Center for Computational Toxicology and Exposure, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina, USA
| | - R. Woodrow Setzer
- Center for Computational Toxicology and Exposure, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina, USA
| | - Victoria Hull
- Center for Computational Toxicology and Exposure, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina, USA
- Oak Ridge Associated Universities, Oak Ridge, Tennessee, USA
| | - Risa R. Sayre
- Center for Computational Toxicology and Exposure, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina, USA
- Oak Ridge Associated Universities, Oak Ridge, Tennessee, USA
| | - Kristin K. Isaacs
- Center for Computational Toxicology and Exposure, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina, USA
| | - John F. Wambaugh
- Center for Computational Toxicology and Exposure, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina, USA
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Warner GR, Li Z, Flaws JA, Smith R. Year-to-year variation in phthalate metabolites in the Midlife Women's Health Study. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2023:10.1038/s41370-023-00614-1. [PMID: 38049486 PMCID: PMC11147960 DOI: 10.1038/s41370-023-00614-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 11/09/2023] [Accepted: 11/20/2023] [Indexed: 12/06/2023]
Abstract
BACKGROUND Humans are widely exposed to phthalates, which are metabolized in the body and excreted in urine. Phthalate metabolites are excreted within hours of exposure, making urinary phthalate biomarker concentrations highly variable. OBJECTIVE The goal of this study was to characterize the long-term variability in phthalate biomarker concentrations in women across the midlife transition and to identify factors that may be associated with increased variability in those phthalate biomarker concentrations by analyzing longitudinal urinary phthalate metabolite data from the Midlife Women's Health Study (2006-2015). METHODS A total of 741 women were enrolled in the study for a period of up to 4 years, during which they each provided 2-4 urine samples per year over 4 consecutive weeks that were pooled for analysis (1876 total pools). Nine phthalate metabolites were assessed individually and as molar sums representative of common compounds (all phthalates: ƩPhthalates; DEHP: ƩDEHP), exposure sources (plastics: ƩPlastic; personal care products: ƩPCP), and modes of action (anti-androgenic: ƩAA). Phthalate metabolites were analyzed by quartile using generalized linear models. In addition, the impact of explanatory variables (race, annual family income, and type of work) on phthalate quartile was examined using ordinal logistic regression models. IMPACT STATEMENT Phthalate biomarker concentrations are highly variable among midlife women over time, and annual sampling may not be sufficient to fully characterize long-term exposure.
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Affiliation(s)
- Genoa R Warner
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ, USA
| | - Zhong Li
- Roy J. Carver Biotechnology Center, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Jodi A Flaws
- Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA
- Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Rebecca Smith
- Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
- Department of Pathobiology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
- Department of Biomedical and Translational Sciences, Carle-Illinois College of Medicine, Urbana, IL, USA.
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Faÿs F, Palazzi P, Zeman F, Hardy EM, Schaeffer C, Rousselle C, Beausoleil C, Appenzeller BMR. Incorporation of Fast-Elimination Chemicals in Hair Is Governed by Pharmacokinetics-Implications for Exposure Assessment. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:7336-7345. [PMID: 37146304 DOI: 10.1021/acs.est.2c06777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Mechanisms governing chemicals' incorporation in hair are incompletely understood, and gaps remain to link the concentration of chemicals in hair to level of exposure and internal dose present in the body. This study assesses the relevance of hair analysis for the biomonitoring of exposure to fast-elimination compounds and investigates the role of pharmacokinetics (PK) in their incorporation in hair. Rats were administered with pesticides, bisphenols, phthalates, and DINCH over 2 months. Hairs were analyzed for 28 chemicals/metabolites to investigate correlations between their concentration in hair and the dose administered to the animals. Urine collected over 24 h after gavage was used to determine chemicals' PK and to investigate their influence on incorporation into hair by means of linear mixed models (LMMs). Eighteen chemicals presented a significant correlation between concentration in hair and level of exposure. In models combining all chemicals, agreement between concentration in hair predicted by LMM and experimental values was moderate (R2 = 0.19) but significantly increased when PK were included in the models (R2 = 0.37), and even more when chemical families were considered separately (e.g., R2 = 0.98 for pesticides). This study shows that pharmacokinetics mediate incorporation of chemicals in hair and suggests the relevance of hair for assessing exposure to fast-elimination chemicals.
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Affiliation(s)
- François Faÿs
- Human Biomonitoring Research Unit, Department of Precision Health, Luxembourg Institute of Health, 1 A-B rue Thomas Edison, 1445 Strassen, Luxembourg
- University of Luxembourg, 2, avenue de l'Université, L-4365 Esch-sur-Alzette, Luxembourg
| | - Paul Palazzi
- Human Biomonitoring Research Unit, Department of Precision Health, Luxembourg Institute of Health, 1 A-B rue Thomas Edison, 1445 Strassen, Luxembourg
| | - Florence Zeman
- Institut national de l'environnement industriel et des risques (INERIS), Direction des Risques Chroniques, Pôle Dangers et Impact sur le Vivant, Unité Modèle pour l'Ecotoxicologie et la Toxicologie (METO), Parc Technologique Alata, 60550 Verneuil-en-Halatte, France
| | - Emilie M Hardy
- Human Biomonitoring Research Unit, Department of Precision Health, Luxembourg Institute of Health, 1 A-B rue Thomas Edison, 1445 Strassen, Luxembourg
| | - Charline Schaeffer
- Human Biomonitoring Research Unit, Department of Precision Health, Luxembourg Institute of Health, 1 A-B rue Thomas Edison, 1445 Strassen, Luxembourg
| | - Christophe Rousselle
- ANSES, Risk Assessment Department, 14 rue Pierre et Marie Curie, 94701 Maisons-Alfort, France
| | - Claire Beausoleil
- ANSES, Risk Assessment Department, 14 rue Pierre et Marie Curie, 94701 Maisons-Alfort, France
| | - Brice M R Appenzeller
- Human Biomonitoring Research Unit, Department of Precision Health, Luxembourg Institute of Health, 1 A-B rue Thomas Edison, 1445 Strassen, Luxembourg
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Santonen T, Mahiout S, Alvito P, Apel P, Bessems J, Bil W, Borges T, Bose-O'Reilly S, Buekers J, Cañas Portilla AI, Calvo AC, de Alba González M, Domínguez-Morueco N, López ME, Falnoga I, Gerofke A, Caballero MDCG, Horvat M, Huuskonen P, Kadikis N, Kolossa-Gehring M, Lange R, Louro H, Martins C, Meslin M, Niemann L, Díaz SP, Plichta V, Porras SP, Rousselle C, Scholten B, Silva MJ, Šlejkovec Z, Tratnik JS, Joksić AŠ, Tarazona JV, Uhl M, Van Nieuwenhuyse A, Viegas S, Vinggaard AM, Woutersen M, Schoeters G. How to use human biomonitoring in chemical risk assessment: Methodological aspects, recommendations, and lessons learned from HBM4EU. Int J Hyg Environ Health 2023; 249:114139. [PMID: 36870229 DOI: 10.1016/j.ijheh.2023.114139] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 02/13/2023] [Accepted: 02/14/2023] [Indexed: 03/06/2023]
Abstract
One of the aims of the European Human Biomonitoring Initiative, HBM4EU, was to provide examples of and good practices for the effective use of human biomonitoring (HBM) data in human health risk assessment (RA). The need for such information is pressing, as previous research has indicated that regulatory risk assessors generally lack knowledge and experience of the use of HBM data in RA. By recognising this gap in expertise, as well as the added value of incorporating HBM data into RA, this paper aims to support the integration of HBM into regulatory RA. Based on the work of the HBM4EU, we provide examples of different approaches to including HBM in RA and in estimations of the environmental burden of disease (EBoD), the benefits and pitfalls involved, information on the important methodological aspects to consider, and recommendations on how to overcome obstacles. The examples are derived from RAs or EBoD estimations made under the HBM4EU for the following HBM4EU priority substances: acrylamide, o-toluidine of the aniline family, aprotic solvents, arsenic, bisphenols, cadmium, diisocyanates, flame retardants, hexavalent chromium [Cr(VI)], lead, mercury, mixture of per-/poly-fluorinated compounds, mixture of pesticides, mixture of phthalates, mycotoxins, polycyclic aromatic hydrocarbons (PAHs), and the UV-filter benzophenone-3. Although the RA and EBoD work presented here is not intended to have direct regulatory implications, the results can be useful for raising awareness of possibly needed policy actions, as newly generated HBM data from HBM4EU on the current exposure of the EU population has been used in many RAs and EBoD estimations.
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Affiliation(s)
| | | | - Paula Alvito
- National Institute of Health Dr. Ricardo Jorge, 1649-016, Lisbon, Portugal; Centre for Environmental and Marine Studies (CESAM), University of Aveiro, 3810-193 Aveiro, Portugal
| | - Petra Apel
- German Environment Agency (UBA), Corrensplatz 1, 14195, Berlin, Germany
| | - Jos Bessems
- VITO-Flemish Institute for Technological Research, Mol, Belgium
| | - Wieneke Bil
- National Institute for Public Health and the Environment, Bilthoven, the Netherlands
| | - Teresa Borges
- General-Directorate of Health, Ministry of Health, 1049-005, Lisbon, Portugal
| | - Stephan Bose-O'Reilly
- Department of Public Health, Health Services Research and Health Technology Assessment, UMIT - Private University for Health Sciences, Medical Informations und Technology, Hall i.T., Austria
| | - Jurgen Buekers
- VITO-Flemish Institute for Technological Research, Mol, Belgium
| | | | - Argelia Castaño Calvo
- National Centre for Environmental Health, Instituto de Salud Carlos III, Madrid, Spain
| | | | | | - Marta Esteban López
- National Centre for Environmental Health, Instituto de Salud Carlos III, Madrid, Spain
| | | | - Antje Gerofke
- German Environment Agency (UBA), Corrensplatz 1, 14195, Berlin, Germany
| | | | | | | | | | | | - Rosa Lange
- German Environment Agency (UBA), Corrensplatz 1, 14195, Berlin, Germany
| | - Henriqueta Louro
- National Institute of Health Dr. Ricardo Jorge, 1649-016, Lisbon, Portugal; ToxOmics-Centre for Toxicogenomics and Human Health, NOVA Medical School, Universidade NOVA de Lisboa, Campo dos Mártires da Pátria, 130, 1169-056, Lisboa, Portugal
| | - Carla Martins
- NOVA National School of Public Health, Public Health Research Centre, NOVA University Lisbon, 1600-560, Lisbon, Portugal; Comprehensive Health Research Center (CHRC), NOVA University Lisbon, 1600-560, Lisbon, Portugal
| | - Matthieu Meslin
- French Agency for Food, Environmental and Occupational Health & Safety, Anses, 14 rue Pierre et Marie Curie, 94701, Maisons-Alfort, France
| | - Lars Niemann
- German Federal Institute for Risk Assessment, Berlin, Germany
| | - Susana Pedraza Díaz
- National Centre for Environmental Health, Instituto de Salud Carlos III, Madrid, Spain
| | - Veronika Plichta
- Austrian Agency for Health and Food Safety, Department Risk Assessment, Spargelfeldstraße 191, 1220, Vienna, Austria
| | | | - Christophe Rousselle
- French Agency for Food, Environmental and Occupational Health & Safety, Anses, 14 rue Pierre et Marie Curie, 94701, Maisons-Alfort, France
| | - Bernice Scholten
- Research Group Risk Analysis for Products in Development, The Netherlands Organisation for Applied Scientific research (TNO), Utrecht, the Netherlands
| | - Maria João Silva
- National Institute of Health Dr. Ricardo Jorge, 1649-016, Lisbon, Portugal; ToxOmics-Centre for Toxicogenomics and Human Health, NOVA Medical School, Universidade NOVA de Lisboa, Campo dos Mártires da Pátria, 130, 1169-056, Lisboa, Portugal
| | | | | | | | - Jose V Tarazona
- National Centre for Environmental Health, Instituto de Salud Carlos III, Madrid, Spain; European Food Safety Authority (EFSA), Parma, Italy
| | - Maria Uhl
- Environment Agency Austria, Spittelauer Lände 5, 1090, Vienna, Austria
| | | | - Susana Viegas
- NOVA National School of Public Health, Public Health Research Centre, NOVA University Lisbon, 1600-560, Lisbon, Portugal; Comprehensive Health Research Center (CHRC), NOVA University Lisbon, 1600-560, Lisbon, Portugal
| | | | - Marjolijn Woutersen
- National Institute for Public Health and the Environment, Bilthoven, the Netherlands
| | - Greet Schoeters
- VITO-Flemish Institute for Technological Research, Mol, Belgium; University of Antwerp, Dept of Biomedical Sciences, Antwerp, Belgium
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Ashley DL, Zhu W, Wang L, Sosnoff C, Feng J, Del Valle-Pinero AY, Cheng YC, Chang CM, van Bemmel D, Borek N, Kimmel HL, Silveira ML, Blount BC. Variability in Urinary Nicotine Exposure Biomarker Levels Between Waves 1 (2013-2014) and 2 (2014-2015) in the Population Assessment of Tobacco and Health Study. Nicotine Tob Res 2023; 25:616-623. [PMID: 35348750 PMCID: PMC10032194 DOI: 10.1093/ntr/ntac056] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 02/17/2022] [Accepted: 02/24/2022] [Indexed: 11/13/2022]
Abstract
INTRODUCTION To date, no studies have evaluated the consistency of biomarker levels in people who smoke over a long-time period in real-world conditions with a large number of subjects and included use behavior and measures of nicotine metabolism. We evaluated the variability of biomarkers of nicotine exposure over approximately a 1-year period in people who exclusively smoke cigarettes, including intensity and recency of use and brand switching to assess impact on understanding associations with product characteristics. AIMS AND METHODS Multivariate regression analysis of longitudinal repeated measures of urinary biomarkers of nicotine exposure from 916 adults in the Population Assessment of Tobacco and Health (PATH) Study with demographic characteristics and use behavior variables. Intraclass correlation coefficients (ICCs) were calculated to examine individual variation of nicotine biomarkers and the uncertainty of repeat measures at two time points (Waves 1 and 2). RESULTS Age, race, and urinary creatinine were significant covariates of urinary cotinine. When including use behavior, recency, and intensity of use were highly significant and variance decreased to a higher extent between than within subjects. The ICC for urinary cotinine decreased from 0.7530 with no use behavior variables in the model to 0.5763 when included. Similar results were found for total nicotine equivalents. CONCLUSIONS Urinary nicotine biomarkers in the PATH Study showed good consistency between Waves 1 and 2. Use behavior measures such as time since last smoked a cigarette and number of cigarettes smoked in the past 30 days are important to include when assessing factors that may influence biomarker concentrations. IMPLICATIONS The results of this study show that the consistency of the nicotine biomarkers cotinine and total nicotine equivalents in spot urine samples from Waves 1 to 2 of the PATH Study is high enough that these data are useful to evaluate the association of cigarette characteristics with biomarkers of exposure under real-world use conditions.
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Affiliation(s)
- David L Ashley
- Department of Population Health Sciences, School of Public Health, Georgia State University, Atlanta, GA, USA
| | - Wanzhe Zhu
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Lanqing Wang
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Connie Sosnoff
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Jun Feng
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Arseima Y Del Valle-Pinero
- Office of Science, Center for Tobacco Products, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Yu-Ching Cheng
- Office of Science, Center for Tobacco Products, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Cindy M Chang
- Office of Science, Center for Tobacco Products, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Dana van Bemmel
- Office of Science, Center for Tobacco Products, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Nicolette Borek
- Office of Science, Center for Tobacco Products, U.S. Food and Drug Administration, Silver Spring, MD, USA
| | - Heather L Kimmel
- Division of Epidemiology, Services and Prevention Research, National Institute for Drug Abuse, National Institutes of Health, Bethesda, MD, USA
| | - Marushka L Silveira
- Division of Epidemiology, Services and Prevention Research, National Institute for Drug Abuse, National Institutes of Health, Bethesda, MD, USA
- Kelly Government Solutions, Rockville, MD, USA
| | - Benjamin C Blount
- Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, GA, USA
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9
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Stanfield Z, Setzer RW, Hull V, Sayre RR, Isaacs KK, Wambaugh JF. Bayesian inference of chemical exposures from NHANES urine biomonitoring data. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2022; 32:833-846. [PMID: 35978002 PMCID: PMC9979158 DOI: 10.1038/s41370-022-00459-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 07/05/2022] [Accepted: 07/12/2022] [Indexed: 05/25/2023]
Abstract
BACKGROUND Knowing which environmental chemicals contribute to metabolites observed in humans is necessary for meaningful estimates of exposure and risk from biomonitoring data. OBJECTIVE Employ a modeling approach that combines biomonitoring data with chemical metabolism information to produce chemical exposure intake rate estimates with well-quantified uncertainty. METHODS Bayesian methodology was used to infer ranges of exposure for parent chemicals of biomarkers measured in urine samples from the U.S population by the National Health and Nutrition Examination Survey (NHANES). Metabolites were probabilistically linked to parent chemicals using the NHANES reports and text mining of PubMed abstracts. RESULTS Chemical exposures were estimated for various population groups and translated to risk-based prioritization using toxicokinetic (TK) modeling and experimental data. Exposure estimates were investigated more closely for children aged 3 to 5 years, a population group that debuted with the 2015-2016 NHANES cohort. SIGNIFICANCE The methods described here have been compiled into an R package, bayesmarker, and made publicly available on GitHub. These inferred exposures, when coupled with predicted toxic doses via high throughput TK, can help aid in the identification of public health priority chemicals via risk-based bioactivity-to-exposure ratios.
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Affiliation(s)
- Zachary Stanfield
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, 27711, USA
| | - R Woodrow Setzer
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, 27711, USA
| | - Victoria Hull
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, 27711, USA
- Oak Ridge Associated Universities (ORAU), Oak Ridge, TN, 37830, USA
| | - Risa R Sayre
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, 27711, USA
| | - Kristin K Isaacs
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, 27711, USA
| | - John F Wambaugh
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, 27711, USA.
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10
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Mok S, Lim JE, Lee A, Kim S, Kim S, Lee I, Kho Y, Park J, Kim S, Choi K, Moon HB. Within- and between-person variability of urinary phthalate metabolites and bisphenol analogues over seven days: Considerations of biomonitoring study design. ENVIRONMENTAL RESEARCH 2022; 209:112885. [PMID: 35131323 DOI: 10.1016/j.envres.2022.112885] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/18/2022] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
Urine was used as a part of a human biomonitoring study based on the excretion kinetics of less-persistent contaminants, such as phthalates and bisphenol A (BPA). Despite the advantages of being non-invasive and easy to collect, urine can show a large variability of concentrations of phthalate metabolites and BPA within a person depending on sampling time. Therefore, it is essential to assess the variability of urinary concentrations for comprehensive sampling design in the context of exposure and risk assessments. In this study, 18 phthalate metabolites and eight BPs were measured in all spot urine (n = 401) collected from 12 participants for seven consecutive days to evaluate within- and between-person variabilities. The intraclass correlation coefficients (ICCs) for all spot urines were poor for monomethyl phthalate (ICC: 0.002) and BPA (0.121) but were moderate for monoethyl phthalate (0.514) and monobenzyl phthalate (0.462). Based on the results of di (2-ethylhexyl) phthalate (DEHP) metabolites, the half-life and differences in metabolic capability seem to affect the ICCs. Urinary mono (2-ethylhexyl) phthalate (MEHP), a primary metabolite of DEHP, was suggested as a short-term exposure marker of DEHP in our study. Creatinine- and specific gravity-adjusted concentrations of phthalate metabolites and BPs resulted in increased ICCs, implying requirements for randomly collected spot urine. Most analytes in the first morning voids (FMVs) were correlated significantly with those in the daily composites, suggesting the feasibility of FMVs to estimate the daily exposure dose. This study facilitates a more comprehensive sampling design and data interpretation strategy for human biomonitoring studies.
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Affiliation(s)
- Sori Mok
- Department of Marine Science and Convergent Technology, College of Science and Convergence Technology, Hanyang University, Ansan, 15588, Republic of Korea
| | - Jae-Eun Lim
- Department of Marine Science and Convergent Technology, College of Science and Convergence Technology, Hanyang University, Ansan, 15588, Republic of Korea
| | - Aram Lee
- Department of Environmental Health Sciences, Soonchunhyang University, Asan, 31538, Republic of Korea
| | - Sungmin Kim
- Department of Health, Environment and Safety, Eulji University, Seongnam, 34824, Republic of Korea
| | - Sunmi Kim
- Chemical Safety Research Center, Chemical Platform Technology Division, Korea Research Institute of Chemical Technology, Daejeon, 34114, Republic of Korea; Graduate School of Public Health, Seoul National University, Seoul, 08826, Republic of Korea
| | - Inae Lee
- Graduate School of Public Health, Seoul National University, Seoul, 08826, Republic of Korea
| | - Younglim Kho
- Department of Health, Environment and Safety, Eulji University, Seongnam, 34824, Republic of Korea
| | - Jeongim Park
- Department of Environmental Health Sciences, Soonchunhyang University, Asan, 31538, Republic of Korea
| | - Sungkyoon Kim
- Graduate School of Public Health, Seoul National University, Seoul, 08826, Republic of Korea
| | - Kyungho Choi
- Graduate School of Public Health, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hyo-Bang Moon
- Department of Marine Science and Convergent Technology, College of Science and Convergence Technology, Hanyang University, Ansan, 15588, Republic of Korea.
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11
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Li Y, Wang X, Feary McKenzie J, 't Mannetje A, Cheng S, He C, Leathem J, Pearce N, Sunyer J, Eskenazi B, Yeh R, Aylward LL, Donovan G, Mueller JF, Douwes J. Pesticide exposure in New Zealand school-aged children: Urinary concentrations of biomarkers and assessment of determinants. ENVIRONMENT INTERNATIONAL 2022; 163:107206. [PMID: 35395578 DOI: 10.1016/j.envint.2022.107206] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 03/21/2022] [Accepted: 03/22/2022] [Indexed: 06/14/2023]
Abstract
This study aimed to assess pesticide exposure and its determinants in children aged 5-14 years. Urine samples (n = 953) were collected from 501 participating children living in urban areas (participant n = 300), rural areas but not on a farm (n = 76), and living on a farm (n = 125). The majority provided two samples, one in the high and one in the low spraying season. Information on diet, lifestyle, and demographic factors was collected by questionnaire. Urine was analysed for 20 pesticide biomarkers by GC-MS/MS and LC-MS/MS. Nine analytes were detected in > 80% of samples, including six organophosphate insecticide metabolites (DMP, DMTP, DEP, DETP, TCPy, PNP), two pyrethroid insecticide metabolites (3-PBA, trans-DCCA), and one herbicide (2,4-D). The highest concentration was measured for TCPy (median 13 μg/g creatinine), a metabolite of chlorpyrifos and triclopyr, followed by DMP (11 μg/g) and DMTP (3.7 μg/g). Urine metabolite levels were generally similar or low compared to those reported for other countries, while relatively high for TCPy and pyrethroid metabolites. Living on a farm was associated with higher TCPy levels during the high spray season. Living in rural areas, dog ownership and in-home pest control were associated with higher levels of pyrethroid metabolites. Urinary concentrations of several pesticide metabolites were higher during the low spraying season, possibly due to consumption of imported fruits and vegetables. Organic fruit consumption was not associated with lower urine concentrations, but consumption of organic food other than fruit or vegetables was associated with lower concentrations of TCPy in the high spray season. In conclusion, compared to other countries such as the U.S., New Zealand children had relatively high exposures to chlorpyrifos/triclopyr and pyrethroids. Factors associated with exposure included age, season, area of residence, diet, in-home pest control, and pets.
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Affiliation(s)
- Yan Li
- QAEHS, Queensland Alliance for Environmental Health Sciences, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland 4102, Australia
| | - Xianyu Wang
- QAEHS, Queensland Alliance for Environmental Health Sciences, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland 4102, Australia.
| | - Jean Feary McKenzie
- Centre for Public Health Research, Massey University. PO Box 756, Wellington 6140, New Zealand
| | - Andrea 't Mannetje
- Centre for Public Health Research, Massey University. PO Box 756, Wellington 6140, New Zealand
| | - Soo Cheng
- Centre for Public Health Research, Massey University. PO Box 756, Wellington 6140, New Zealand
| | - Chang He
- QAEHS, Queensland Alliance for Environmental Health Sciences, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland 4102, Australia
| | - Janet Leathem
- School of Psychology, Massey University, PO Box 756, Wellington 6140, New Zealand
| | - Neil Pearce
- Department of Medical Statistics, London School of Hygiene and Tropical Medicine. London WC1E 7HT, UK
| | - Jordi Sunyer
- Barcelona Institute for Global Health (ISGlobal), Barcelona, Catalonia, Spain
| | - Brenda Eskenazi
- Center for Environmental Research and Community Health (CERCH), School of Public Health, University of California,1995 University Ave, Berkeley, CA 94720, United States
| | - Ruby Yeh
- QAEHS, Queensland Alliance for Environmental Health Sciences, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland 4102, Australia
| | - Lesa L Aylward
- QAEHS, Queensland Alliance for Environmental Health Sciences, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland 4102, Australia; Summit Toxicology, LLP, 22044, Falls Church, VA, USA
| | - Geoffrey Donovan
- Centre for Public Health Research, Massey University. PO Box 756, Wellington 6140, New Zealand; USDA Forest Service, PNW Research Station, Portland, OR, USA
| | - Jochen F Mueller
- QAEHS, Queensland Alliance for Environmental Health Sciences, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland 4102, Australia
| | - Jeroen Douwes
- Centre for Public Health Research, Massey University. PO Box 756, Wellington 6140, New Zealand
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12
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Integrating toxicokinetics into toxicology studies and the human health risk assessment process for chemicals: Reduced uncertainty, better health protection. Regul Toxicol Pharmacol 2021; 128:105092. [PMID: 34863906 DOI: 10.1016/j.yrtph.2021.105092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 11/23/2021] [Accepted: 11/29/2021] [Indexed: 01/16/2023]
Abstract
The database of practical examples where toxicokinetic (TK) data has benefitted all stages of the human health risk assessment process are increasingly being published and accepted. This review aimed to highlight and summarise notable examples and to describe the "state of the art" in this field. The overall recommendation is that for any in vivo animal study conducted, measurements of TK should be very carefully considered for inclusion as the numerous benefits this brings continues to grow, particularly during the current march towards animal free toxicology testing and ambitions to eventually conduct human health risk assessments entirely based upon non-animal methods.
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13
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Modelling the Renal Excretion of the Mycotoxin Deoxynivalenol in Humans in an Everyday Situation. Toxins (Basel) 2021; 13:toxins13100675. [PMID: 34678968 PMCID: PMC8540402 DOI: 10.3390/toxins13100675] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 09/16/2021] [Indexed: 11/17/2022] Open
Abstract
The dietary exposure to the mycotoxin deoxynivalenol (DON) can be assessed by human biomonitoring (HBM). Here, we assessed the relation between dietary DON intake and the excretion of its major metabolite DON-15-glucuronide (DON15GlcA) through time, in an everyday situation. For 49 volunteers from the EuroMix biomonitoring study, the intake of DON from each meal was calculated and the excretion of DON and its metabolites was analyzed for each urine void collected separately throughout a 24-h period. The relation between DON and DON15GlcA was analyzed with a statistical model to assess the residence time and the excreted fraction of ingested DON as DON15GlcA (fabs_excr). Fabs_excr was treated as a random effect variable to address its heterogeneity in the population. The estimated time in which 97.5% of the ingested DON was excreted as DON15GlcA was 12.1 h, the elimination half-life was 4.0 h. Based on the estimated fabs_excr, the mean reversed dosimetry factor (RDF) of DON15GlcA was 2.28. This RDF can be used to calculate the amount of total DON intake in an everyday situation, based on the excreted amount of DON15GlcA. We show that urine samples collected over 24 h are the optimal design to study DON exposure by HBM.
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14
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Sharma BM, Kalina J, Whaley P, Scheringer M. Towards guidelines for time-trend reviews examining temporal variability in human biomonitoring data of pollutants. ENVIRONMENT INTERNATIONAL 2021; 151:106437. [PMID: 33626456 DOI: 10.1016/j.envint.2021.106437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 01/29/2021] [Accepted: 01/30/2021] [Indexed: 05/21/2023]
Abstract
In the last few decades, a plethora of studies have focused on human biomonitoring (HBM) of chemical pollutants. Reviewing the copious HBM data reported in these studies is essential for evaluating the effectiveness of pollution management efforts, for example by evaluating time-trends. Nevertheless, guidance to systematically evaluate time trends in published HBM data has never been developed. In this study, we therefore present a proposal for guidelines to conduct "time-trend reviews" (TTRs) that examine time trends in published large HBM datasets of chemical pollutant concentrations. We also demonstrate the applicability of these guidelines through a case study that assesses time-trends in global and regional HBM data on mercury. The recommended TTR guidelines in this study are divided into seven steps: formulating the objective of the TTR, setting up of eligibility criteria, defining search strategy and screening of literature, screening results of search, extracting data, analysing data, and assessing certainty, including the potential for bias in the evidence base. The TTR guidelines proposed in this study are straightforward and less complex than those for conducting systematic reviews assessing datasets on potential human health effects of exposure to pollutants or medical interventions. These proposed guidelines are intended to enable the credible, transparent, and reproducible conduct of TTRs.
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Affiliation(s)
| | - Jiří Kalina
- RECETOX, Masaryk University, 62500 Brno, Czech Republic
| | - Paul Whaley
- Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom
| | - Martin Scheringer
- RECETOX, Masaryk University, 62500 Brno, Czech Republic; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, 8092 Zürich, Switzerland
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15
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Kannan K, Stathis A, Mazzella MJ, Andra SS, Barr DB, Hecht SS, Merrill LS, Galusha AL, Parsons PJ. Quality assurance and harmonization for targeted biomonitoring measurements of environmental organic chemicals across the Children's Health Exposure Analysis Resource laboratory network. Int J Hyg Environ Health 2021; 234:113741. [PMID: 33773388 DOI: 10.1016/j.ijheh.2021.113741] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 02/25/2021] [Accepted: 03/10/2021] [Indexed: 11/18/2022]
Abstract
A consortium of laboratories established under the Children's Health Exposure Analysis Resource (CHEAR) used a multifaceted quality assurance program to promote measurement harmonization for trace organics analyses of human biospecimens that included: (1) participation in external quality assurance (EQA)/proficiency testing (PT) programs; (2) analyses of a urine-based CHEAR common quality control (QC) pool with each analytical batch across all participating laboratories; (3) method validation against NIST Standard Reference Materials® (SRMs); and (4) analyses of blinded duplicates and other project-specific QC samples. The capability of five CHEAR laboratories in organic chemical analysis increased across the 4-year period, and performance in the external PT program improved over time - recent challenges reporting >90% analytes with satisfactory performance. The CHEAR QC pools were analyzed for several classes of organic chemicals including phthalate metabolites and environmental phenols by the participating laboratories with every batch of project samples, which provided a rich source of measurement data for the assessment of intra- and inter-laboratory variance. Within-laboratory and overall variabilities in measurements across laboratories were calculated for target chemicals in urine QC pools; the coefficient of variation (CV) was generally below 25% across batches, studies and laboratories and indicated acceptable analytical imprecision. The suite of organic chemicals analyzed in the CHEAR QC pool was broader than those reported for commercially available reference materials. The accuracy of each of the laboratories' methods was verified through the analysis of several NIST SRMs and was, for example, 97 ± 5.2% for environmental phenols and 95 ± 11% for phthalates. Analysis of blinded duplicate samples showed excellent agreement and reliability of measurements. The intra-class correlation coefficients (ICC) for phthalate metabolites analyzed in various batches across three CHEAR laboratories showed excellent reliability (typically >0.90). Overall, the multifaceted quality assurance protocols followed among the CHEAR laboratories ensured reliable and reproducible data quality for several classes of organic chemicals. Increased participation in external PT programs through inclusion of additional target analytes will further enhance the confidence in data quality.
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Affiliation(s)
- Kurunthachalam Kannan
- Department of Pediatrics and Department of Environmental Medicine, New York University, School of Medicine, New York, NY, 10016, USA.
| | - Alexa Stathis
- Division of Environmental Health Sciences, Wadsworth Center, New York State Department of Health, Albany, NY, 12237, USA
| | - Matthew J Mazzella
- Department of Environmental Medicine & Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Syam S Andra
- Department of Environmental Medicine & Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Dana Boyd Barr
- Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, 30322, USA
| | - Stephen S Hecht
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, 55455, USA
| | | | - Aubrey L Galusha
- Division of Environmental Health Sciences, Wadsworth Center, New York State Department of Health, Albany, NY, 12237, USA; Department of Environmental Health Sciences, University at Albany, Rensselaer, NY, 12144, USA
| | - Patrick J Parsons
- Division of Environmental Health Sciences, Wadsworth Center, New York State Department of Health, Albany, NY, 12237, USA; Department of Environmental Health Sciences, University at Albany, Rensselaer, NY, 12144, USA
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16
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Tohon H, Valcke M, Aranda-Rodriguez R, Nong A, Haddad S. Estimation of toluene exposure in air from BMA (S-benzylmercapturic acid) urinary measures using a reverse dosimetry approach based on physiologically pharmacokinetic modeling. Regul Toxicol Pharmacol 2021; 120:104860. [PMID: 33406392 DOI: 10.1016/j.yrtph.2020.104860] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 12/14/2020] [Accepted: 12/28/2020] [Indexed: 10/22/2022]
Abstract
This study aimed to use a reverse dosimetry PBPK modeling approach to estimate toluene atmospheric exposure from urinary measurements of S-benzylmercapturic acid (BMA) in a small group of individuals and to evaluate the uncertainty associated to urinary spot-sampling compared to 24-h collected urine samples. Each exposure assessment technique was developed namely to estimate toluene air exposure from BMA measurements in 24-h urine samples (24-h-BMA) and from distributions of daily urinary BMA spot measurements (DUBSM). Model physiological parameters were described based upon age, weight, size and sex. Monte Carlo simulations with the PBPK model allowed converting DUBSM distribution (and 24-h-BMA) into toluene air levels. For the approach relying on DUBSM distribution, the ratio between the 95% probability of predicted toluene concentration and its 50% probability in each individual varied between 1.2 and 1.4, while that based on 24-h-BMA varied between 1.0 and 1.1. This suggests more variability in estimated exposure from spot measurements. Thus, estimating toluene exposure based on DUBSM distribution generated about 20% more uncertainty. Toluene levels estimated (0.0078-0.0138 ppm) are well below Health Canada's maximum chronic air guidelines. PBPK modeling and reverse dosimetry may be combined to interpret urinary metabolites data of VOCs and assess related uncertainties.
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Affiliation(s)
- Honesty Tohon
- Department of Environmental and Occupational Health, ESPUM, CReSP, Université de Montréal, C.P. 6128 Succ. Centre-ville, Montreal, Qc, H3C 3J7, Canada
| | - Mathieu Valcke
- Department of Environmental and Occupational Health, ESPUM, CReSP, Université de Montréal, C.P. 6128 Succ. Centre-ville, Montreal, Qc, H3C 3J7, Canada; Direction de la santé environnementale et de la toxicologie, Institut national de santé publique du Québec, Montréal, Quebec, Canada
| | - Rocio Aranda-Rodriguez
- Exposure and Biomonitoring Division, Environmental Health Sciences and Research Bureau, Health Canada, Ottawa, ON, Canada
| | - Andy Nong
- Exposure and Biomonitoring Division, Environmental Health Sciences and Research Bureau, Health Canada, Ottawa, ON, Canada
| | - Sami Haddad
- Department of Environmental and Occupational Health, ESPUM, CReSP, Université de Montréal, C.P. 6128 Succ. Centre-ville, Montreal, Qc, H3C 3J7, Canada.
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17
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Pauwels CGGM, Hintzen KFH, Talhout R, Cremers HWJM, Pennings JLA, Smolinska A, Opperhuizen A, Van Schooten FJ, Boots AW. Smoking regular and low-nicotine cigarettes results in comparable levels of volatile organic compounds in blood and exhaled breath. J Breath Res 2020; 15:016010. [PMID: 33027777 DOI: 10.1088/1752-7163/abbf38] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Smokers are exposed to more than 6000 (toxic) smoke components including volatile organic compounds (VOCs). In this study VOCs levels in headspace of blood and exhaled breath, in the mainstream smoke of three types of cigarettes of one brand varying in declared tar, nicotine and carbon monoxide (TNCO) yields are investigated. The objective was to identify whether VOC levels correlate with TNCO yields of cigarettes smoked according to ISO 3308. Our data show that smoking regular and low-TNCO cigarettes result in comparable levels of VOCs in blood and exhaled breath. Hence, declared TNCO-yields as determined with the ISO 3308 machine smoking protocol are irrelevant for predicting VOC exposure upon human smoking. Venous blood and exhaled breath were sampled from 12 male volunteers directly before and 10 min after smoking cigarettes on 3 d (day 1 Marlboro Red (regular), day 2 Marlboro Prime (highly ventilated, low-TNCO), day 3 Marlboro Prime with blocked filter ventilation (taped)). Upon smoking, the levels of toluene, ethylbenzene, m/p-xylene, o-xylene, and 2,5-dimethylfuran in both headspace of venous blood and exhaled breath increase within the same range for all three cigarette types smoked. However, no strong correlation was found between VOC levels in exhaled breath and VOC levels in headspace of blood because of variations between the individual smoking volunteers. More research is required in order to use exhaled breath sampling as a non-invasive quantitative marker for volatile toxicants from cigarette smoke exposure of different brands.
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Affiliation(s)
- Charlotte G G M Pauwels
- Department of Pharmacology and Toxicology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
- Centre for Health Protection, National Institute for Public Health and the Environment (RIVM), Maastricht, The Netherlands
| | - Kim F H Hintzen
- Department of Pharmacology and Toxicology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Reinskje Talhout
- Centre for Health Protection, National Institute for Public Health and the Environment (RIVM), Maastricht, The Netherlands
| | - Hans W J M Cremers
- Centre for Health Protection, National Institute for Public Health and the Environment (RIVM), Maastricht, The Netherlands
| | - Jeroen L A Pennings
- Centre for Health Protection, National Institute for Public Health and the Environment (RIVM), Maastricht, The Netherlands
| | - Agnieszka Smolinska
- Department of Pharmacology and Toxicology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Antoon Opperhuizen
- Department of Pharmacology and Toxicology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
- Office of Risk Assessment and Research, Netherlands Food and Consumer Product Safety Authority (NVWA), Maastricht, The Netherlands
| | - Frederik J Van Schooten
- Department of Pharmacology and Toxicology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Agnes W Boots
- Department of Pharmacology and Toxicology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
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18
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Kvasnicka J, Cohen Hubal E, Ladan J, Zhang X, Diamond ML. Transient Multimedia Model for Investigating the Influence of Indoor Human Activities on Exposure to SVOCs. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:10772-10782. [PMID: 32786603 PMCID: PMC8637498 DOI: 10.1021/acs.est.0c03268] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Empirical evidence suggests that human occupants indoors, through their presence and activities, can influence the dynamics of semivolatile organic compounds (SVOCs). To better understand these dynamics, a transient multimedia human exposure model was developed (Activity-Based Indoor Chemical Assessment Model (ABICAM)). This model parametrizes mass-balance equations as functions of time-dependent human activities. As a case study, ABICAM simulated exposures of an archetypal adult and toddler over 24 h to diethyl phthalate (DEP), butyl benzyl phthalate (BBzP), and di-2-ethylhexyl phthalate (DEHP) that span a wide range of gas-particle partitioning tendencies. Under baseline (no activities beyond respiration), the toddler's time-average internal doses were three to four times higher than the adult's, due to differences in physical human attributes (e.g., inhalation rate). When time-dependent activities were considered, interindividual (e.g., adult vs toddler) variability was accentuated by up to a factor of 3 for BBzP. Activities with the greatest influence on time-average internal dose were showering (-71% for BBzP), cooking (+27% for DEHP), and sleeping (-26% for DEHP). Overall, the results support the hypotheses that (1) transient indoor activities can give rise to intraindividual variability in estimated internal doses of SVOCs, and (2) interindividual variability in such exposure can result from differences in activity patterns and physical human attributes, according to a compound's physical-chemical properties.
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Affiliation(s)
- Jacob Kvasnicka
- Department of Earth Sciences, University of Toronto, Toronto, Ontario M5S 3B1, Canada
| | - Elaine Cohen Hubal
- Center for Public Health and Environmental Assessment, Environmental Protection Agency, Durham, North Carolina 27701, United States
| | - John Ladan
- Department of Physics, University of Toronto, Toronto, Ontario M5S 3B1, Canada
| | - Xianming Zhang
- Department of Earth Sciences, University of Toronto, Toronto, Ontario M5S 3B1, Canada
| | - Miriam L Diamond
- Department of Earth Sciences, University of Toronto, Toronto, Ontario M5S 3B1, Canada
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario M5S 3B1, Canada
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19
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Han AA, Timchalk C, Carver ZA, Weber TJ, Tyrrell KJ, Sontag RL, Gibbins T, Chrisler WB, Weitz KK, Du D, Lin Y, Smith JN. Physiologically Based Pharmacokinetic Modeling of Salivary Concentrations for Noninvasive Biomonitoring of 2,4-Dichlorophenoxyacetic Acid (2,4-D). Toxicol Sci 2020; 172:330-343. [PMID: 31550007 DOI: 10.1093/toxsci/kfz206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Saliva has become a favorable sample matrix for biomonitoring due to its noninvasive attributes and overall flexibility in collection. To ensure measured salivary concentrations reflect the exposure, a solid understanding of the salivary transport mechanism and relationships between salivary concentrations and other monitored matrices (ie, blood, urine) is needed. Salivary transport of a commonly applied herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D), was observed in vitro and in vivo and a physiologically based pharmacokinetic (PBPK) model was developed to translate observations from the cell culture model to those in animal models and further evaluate 2,4-D kinetics in humans. Although apparent differences in experimental in vitro and in vivo saliva:plasma ratios (0.034 and 0.0079) were observed, simulations with the PBPK model demonstrated dynamic time and dose-dependent saliva:plasma ratios, elucidating key mechanisms affecting salivary transport. The model suggested that 2,4-D exhibited diffusion-limited transport to saliva and was additionally impacted by protein binding saturation and permeability across the salivary gland. Consideration of sampling times post-exposure and potential saturation of transport mechanisms are then critical aspects for interpreting salivary 2,4-D biomonitoring observations. This work utilized PBPK modeling in in vitro to in vivo translation to explore benefits and limitations of salivary analysis for occupational biomonitoring.
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Affiliation(s)
- Alice A Han
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
| | - Charles Timchalk
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
| | - Zana A Carver
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
| | - Thomas J Weber
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
| | - Kimberly J Tyrrell
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
| | - Ryan L Sontag
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
| | - Teresa Gibbins
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
| | - William B Chrisler
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
| | - Karl K Weitz
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
| | - Dan Du
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164
| | - Yuehe Lin
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164
| | - Jordan N Smith
- Chemical Biology & Exposure Science, Pacific Northwest National Laboratory, Richland, Washington 99354
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Sabbioni G, Berset JD, Day BW. Is It Realistic to Propose Determination of a Lifetime Internal Exposome? Chem Res Toxicol 2020; 33:2010-2021. [PMID: 32672951 DOI: 10.1021/acs.chemrestox.0c00092] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Biomonitoring of xenobiotics has been performed for many years in occupational and environmental medicine. It has revealed hidden exposures and the exposure of workers could be reduced. Although most of the toxic effects of chemicals on humans were discovered in workers, the scientific community has more recently focused on environmental samples. In several countries, urinary and blood samples have been collected and analyzed for xenobiotics. Health, biochemical, and clinical parameters were measured in the biomonitoring program of the Unites States. The data were collected and evaluated as group values, comparing races, ages, and gender. The term exposome was created in order to relate chemical exposure to health effects together with the terms genome, proteome, and transcriptome. Internal exposures were mostly established with snapshot measurements, which can lead to an obvious misclassification of the individual exposures. Albumin and hemoglobin adducts of xenobiotics reflect the exposure of a larger time frame, up to 120 days. It is likely that only a small fraction of xenobiotics form such adducts. In addition, adduct analyses are more work intensive than the measurement of xenobiotics and metabolites in urine and/or blood. New technology, such as high-resolution mass spectrometry, will enable the discovery of new compounds that have been overlooked in the past, since over 300,000 chemicals are commercially available and most likely also present in the environment. Yet, quantification will be challenging, as it was for the older methods. At this stage, determination of a lifetime internal exposome is very unrealistic. Instead of an experimental approach with a large number of people, which is economically and scientifically not feasible, in silico methods should be developed further to predict exposure, toxicity, and potential health effects of mixtures. The computer models will help to focus internal exposure investigations on smaller groups of people and smaller number of chemicals.
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Affiliation(s)
- Gabriele Sabbioni
- Institute of Environmental and Occupational Toxicology, CH-6780 Airolo, Switzerland.,Walther-Straub-Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, D-80336 München, Germany
| | - Jean-Daniel Berset
- Institute of Environmental and Occupational Toxicology, CH-6780 Airolo, Switzerland
| | - Billy W Day
- Medantox LLC, Pittsburgh, Pennsylvania 15241, United States.,ReNeuroGen LLC, Elm Grove, Wisconsin 53122, United States
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21
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Concepcion J, Chen K, Saito R, Gangoiti J, Mendez E, Nikita ME, Barshop BA, Natarajan L, Sharma K, Kim JJ. Identification of pathognomonic purine synthesis biomarkers by metabolomic profiling of adolescents with obesity and type 2 diabetes. PLoS One 2020; 15:e0234970. [PMID: 32589682 PMCID: PMC7319336 DOI: 10.1371/journal.pone.0234970] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 06/05/2020] [Indexed: 12/18/2022] Open
Abstract
The incidence of type 2 diabetes is increasing more rapidly in adolescents than in any other age group. We identified and compared metabolite signatures in obese children with type 2 diabetes (T2D), obese children without diabetes (OB), and healthy, age- and gender-matched normal weight controls (NW) by measuring 273 analytes in fasting plasma and 24-hour urine samples from 90 subjects by targeted LC-MS/MS. Diabetic subjects were within 2 years of diagnosis in an attempt to capture early-stage disease prior to declining renal function. We found 22 urine metabolites that were uniquely associated with T2D when compared to OB and NW groups. The metabolites most significantly elevated in T2D youth included members of the betaine pathway, nucleic acid metabolism, and branched-chain amino acids (BCAAs) and their catabolites. Notably, the metabolite pattern in OB and T2D groups differed between urine and plasma, suggesting that urinary BCAAs and their intermediates behaved as a more specific biomarker for T2D, while plasma BCAAs associated with the obese, insulin resistant state independent of diabetes status. Correlative analysis of metabolites in the T2D signature indicated that betaine metabolites, BCAAs, and aromatic amino acids were associated with hyperglycemia, but BCAA acylglycine derivatives and nucleic acid metabolites were linked to insulin resistance. Of major interest, we found that urine levels of succinylaminoimidazole carboxamide riboside (SAICA-riboside) were increased in diabetic youth, identifying urine SAICA-riboside as a potential biomarker for T2D.
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Affiliation(s)
- Jennifer Concepcion
- Department of Pediatrics, University of California San Diego, La Jolla, CA, United States of America
- Rady Children’s Hospital, San Diego, CA, United States of America
| | - Katherine Chen
- Department of Pediatrics, University of California San Diego, La Jolla, CA, United States of America
| | | | - Jon Gangoiti
- Department of Pediatrics, University of California San Diego, La Jolla, CA, United States of America
| | - Eric Mendez
- Department of Pediatrics, University of California San Diego, La Jolla, CA, United States of America
| | - Maria Eleni Nikita
- Department of Pediatrics, University of California San Diego, La Jolla, CA, United States of America
| | - Bruce A. Barshop
- Department of Pediatrics, University of California San Diego, La Jolla, CA, United States of America
- Rady Children’s Hospital, San Diego, CA, United States of America
| | - Loki Natarajan
- Department of Family Medicine and Public Health, University of California San Diego, La Jolla, CA, United States of America
| | - Kumar Sharma
- Center for Renal Precision Medicine, Department of Medicine, University of Texas Health San Antonio, San Antonio, TX, Unied States of America
| | - Jane J. Kim
- Department of Pediatrics, University of California San Diego, La Jolla, CA, United States of America
- Rady Children’s Hospital, San Diego, CA, United States of America
- * E-mail:
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Ashley DL, Smith MM, Silva LK, Yoo YM, De Jesús VR, Blount BC. Factors Associated with Exposure to Trihalomethanes, NHANES 2001-2012. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:1066-1074. [PMID: 31865698 DOI: 10.1021/acs.est.9b05745] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Disinfection is critical for maintaining a safe water supply, but the use of chlorine or chloramine leads to exposure to disinfection byproducts (DBPs), including trihalomethanes (THMs), which have been associated with adverse reproductive outcomes and bladder cancer. The U.S. Environmental Protection Agency revised the DBP regulations starting in 1998 to further limit levels of THMs in household water. We analyzed data from the National Health and Nutrition Examination Survey (NHANES) collected between 2001 and 2012 (with 2 years per cycle) using models with and without water-related predictors to examine the utility of including these measures. Median blood chloroform levels (25th-75th percentiles) were 16.2 (9.13-31.2) ng/L in 2001-2002 and 5.97 (2.92-12.3) ng/L in 2011-2012. Median blood bromodichloromethane (BDCM) levels (25th-75th percentiles) were 2.22 (1.06-4.61) ng/L in 2001-2002 and 1.18 (<limit of detection-2.92) ng/L in 2011-2012. THM water concentrations and measures of the recency since time spent in water use activities were associated with blood THM levels. Being in a pool/hot tub/sauna within 24 h or taking a shower/bath within 6 h of blood collection was associated with elevated blood levels of chloroform and BDCM. When possible, it is important to include recency and external dose when assessing associations to internal dose levels for nonpersistent compounds.
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Affiliation(s)
- David L Ashley
- School of Public Health , Georgia State University , Atlanta , Georgia 30303 , United States
| | - Mitchell M Smith
- Tobacco and Volatiles Branch, Division of Laboratory Sciences, National Center for Environmental Health , Centers for Disease Control and Prevention , Atlanta , Georgia 30341 , United States
| | - Lalith K Silva
- Tobacco and Volatiles Branch, Division of Laboratory Sciences, National Center for Environmental Health , Centers for Disease Control and Prevention , Atlanta , Georgia 30341 , United States
| | - Young M Yoo
- Tobacco and Volatiles Branch, Division of Laboratory Sciences, National Center for Environmental Health , Centers for Disease Control and Prevention , Atlanta , Georgia 30341 , United States
| | - Víctor R De Jesús
- Tobacco and Volatiles Branch, Division of Laboratory Sciences, National Center for Environmental Health , Centers for Disease Control and Prevention , Atlanta , Georgia 30341 , United States
| | - Benjamin C Blount
- Tobacco and Volatiles Branch, Division of Laboratory Sciences, National Center for Environmental Health , Centers for Disease Control and Prevention , Atlanta , Georgia 30341 , United States
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23
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Valcke M, Karthikeyan S, Walker M, Gagné M, Copes R, St-Amand A. Regional variations in human chemical exposures in Canada: A case study using biomonitoring data from the Canadian Health Measures Survey for the provinces of Quebec and Ontario. Int J Hyg Environ Health 2020; 225:113451. [PMID: 31972364 DOI: 10.1016/j.ijheh.2020.113451] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 12/03/2019] [Accepted: 01/09/2020] [Indexed: 10/25/2022]
Abstract
The Canadian Health Measures Survey (CHMS), an ongoing national health survey conducted in two-year cycles, collects extensive biomonitoring data that is used to assess the exposure of Canadians to environmental chemicals of concern. Combining data from multiple cycles of the CHMS allows for the calculation of robust regional estimates of chemical concentrations in blood and urine. The objective of this work was to compare biomarkers of exposure to several environmental chemicals for the provinces of Quebec and Ontario, two major CHMS regions, as well as the entire CHMS (representing Canada) minus Quebec (CMQ), and the entire CHMS minus Ontario (CMO), and to interpret differences between regions. Geometric means and 95th percentiles of blood and/or urinary concentrations of 45 environmental chemicals or their metabolites for Ontario, Quebec, CMQ, and CMO were calculated by combining the two most recent cycles of data available for a chemical (cycles 1 and 2, or cycles 2 and 3) from the first three cycles of the CHMS (2007-2013). Weighted one-way ANOVA was used to test the differences between regional estimates. After applying a Bonferonni-Holm adjustment for multiple comparisons, the following measures were significantly higher in Quebec as compared to Ontario and CMQ: blood lead, urinary lead and the urinary polyaromatic hydrocarbon (PAH) metabolites, 9-hydroxyfluorene, 1-hydroxyphenanthrene, 2- hydroxyphenanthrene and 3-hydroxyphenanthrene. In Quebec compared to CMQ only, urinary 2-hydroxfluorene, 3-hydroxyfluorene, 2-hydroxynaphthalene, and 4-hydroxyphenanthrene were higher. The concentration of urinary fluoride was significantly higher in Ontario as compared to Quebec and CMO. Blood manganese and urinary fluoride were significantly lower in Quebec compared to CMQ, and blood and urinary selenium were significantly lower in Ontario compared to CMO. Regional differences in tobacco use, age of dwellings and drinking water fluoridation are among the possible contributing factors to some of the observed differences. In conclusion, this is the first study where biomonitoring data from multiple cycles of CHMS were combined in order to generate robust estimates for subsets of the Canadian population. Such assessments can contribute to a regional-level prioritization of control measures to reduce the exposure of Canadians to chemicals in their environment.
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Affiliation(s)
- Mathieu Valcke
- Direction de la Santé Environnementale et de la Toxicologie, Institut National de Santé Publique du Québec, Montréal, Canada; Département de Santé Environnementale et de Santé au Travail, École de Santé Publique de l'Université de Montréal, Canada.
| | | | - Mike Walker
- Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Canada
| | - Michelle Gagné
- Direction de la Santé Environnementale et de la Toxicologie, Institut National de Santé Publique du Québec, Montréal, Canada
| | - Ray Copes
- Public Health Ontario, Toronto, Canada; Dalla Lana School of Public Health, University of Toronto, Canada
| | - Annie St-Amand
- Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Canada
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24
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Faure S, Noisel N, Werry K, Karthikeyan S, Aylward LL, St-Amand A. Evaluation of human biomonitoring data in a health risk based context: An updated analysis of population level data from the Canadian Health Measures Survey. Int J Hyg Environ Health 2019; 223:267-280. [PMID: 31523017 DOI: 10.1016/j.ijheh.2019.07.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 07/19/2019] [Accepted: 07/20/2019] [Indexed: 11/28/2022]
Abstract
In order to characterize exposure of the Canadian population to environmental chemicals, a human biomonitoring component has been included in the Canadian Health Measures Survey (CHMS). This nationally-representative survey, launched in 2007 by the Government of Canada, has measured over 250 chemicals in approximately 30,000 Canadians during the last decade. The capacity to interpret these data at the population level in a health risk context is gradually improving with the development of biomonitoring screening values, such as biomonitoring equivalents (BE) and human biomonitoring (HBM) values. This study evaluates recent population level biomonitoring data from the CHMS in a health risk context using biomonitoring screening values. Nationally representative biomonitoring data for fluoride, selenium, molybdenum, arsenic, silver, thallium, cyfluthrin, 2,4-dichlorophenoxyacetic acid (2,4-D), 3-phenoxybenzoic acid (3-PBA), chlorpyrifos, deltamethrin, bisphenol A, triclosan, acrylamide, cadmium, perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), bromoform, chloroform, benzene, toluene, xylene, ethylbenzene, styrene and tetrachloroethylene were screened as part as this study. For non-cancer endpoints, hazard quotients (HQs) were calculated as the ratio of population level concentrations of a specific chemical at the geometric mean and 95th percentile to the corresponding biomonitoring screening value. Cancer risks were calculated at the 5th, 25th, 50th, 75th and 95th percentiles of the population concentration using BEs based on a risk specific dose. Most of the chemicals analyzed had HQs below 1 suggesting that levels of exposure to these chemicals are not a concern at the population level. However, HQs exceeded 1 in smokers for cadmium, acrylamide and benzene, as well as in the general population for inorganic arsenic, PFOS and PFOA, 3-PBA and fluoride. Furthermore, cancer risks for inorganic arsenic, acrylamide, and benzene at most population percentiles of exposure were elevated (>10-5). Specifically, for inorganic arsenic in the general population, the HQ was 3.13 at the 95th percentile concentration and the cancer risk was 3.4 × 10-4 at the 50th percentile of population concentrations. These results suggest that the levels of exposure in the Canadian population to some of the environmental chemicals assessed might be of concern. The results of this screening exercise support the findings of previous risk assessments and ongoing efforts to reduce risks from exposure to chemicals evaluated as part of this study. Although paucity of biomonitoring screening values for several environmental contaminants may be a limitation to this approach, our assessment contributes to the prioritization of a number of chemicals measured as part of CHMS for follow-up activities such as more detailed characterization of exposure sources.
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Affiliation(s)
- Sarah Faure
- Environmental Health Science and Research Bureau, Health Canada, Ottawa, ON, Canada; Department of Environmental and Occupational Health, University of Montreal, Montreal, Quebec, Canada.
| | - Nolwenn Noisel
- Department of Environmental and Occupational Health, University of Montreal, Montreal, Quebec, Canada.
| | - Kate Werry
- Environmental Health Science and Research Bureau, Health Canada, Ottawa, ON, Canada.
| | | | - Lesa L Aylward
- Summit Toxicology, LLP, Falls Church, VA, USA; Queensland Alliance for Environmental Health Sciences, University of Queensland, Brisbane, QLD, Australia.
| | - Annie St-Amand
- Environmental Health Science and Research Bureau, Health Canada, Ottawa, ON, Canada.
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25
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Derivation of biomonitoring equivalents (BE values) for zinc. Regul Toxicol Pharmacol 2019; 106:178-186. [DOI: 10.1016/j.yrtph.2019.04.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 04/15/2019] [Accepted: 04/21/2019] [Indexed: 11/23/2022]
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26
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27
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Ring CL, Arnot JA, Bennett DH, Egeghy PP, Fantke P, Huang L, Isaacs KK, Jolliet O, Phillips KA, Price PS, Shin HM, Westgate JN, Setzer RW, Wambaugh JF. Consensus Modeling of Median Chemical Intake for the U.S. Population Based on Predictions of Exposure Pathways. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:719-732. [PMID: 30516957 PMCID: PMC6690061 DOI: 10.1021/acs.est.8b04056] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Prioritizing the potential risk posed to human health by chemicals requires tools that can estimate exposure from limited information. In this study, chemical structure and physicochemical properties were used to predict the probability that a chemical might be associated with any of four exposure pathways leading from sources-consumer (near-field), dietary, far-field industrial, and far-field pesticide-to the general population. The balanced accuracies of these source-based exposure pathway models range from 73 to 81%, with the error rate for identifying positive chemicals ranging from 17 to 36%. We then used exposure pathways to organize predictions from 13 different exposure models as well as other predictors of human intake rates. We created a consensus, meta-model using the Systematic Empirical Evaluation of Models framework in which the predictors of exposure were combined by pathway and weighted according to predictive ability for chemical intake rates inferred from human biomonitoring data for 114 chemicals. The consensus model yields an R2 of ∼0.8. We extrapolate to predict relevant pathway(s), median intake rate, and credible interval for 479 926 chemicals, mostly with minimal exposure information. This approach identifies 1880 chemicals for which the median population intake rates may exceed 0.1 mg/kg bodyweight/day, while there is 95% confidence that the median intake rate is below 1 μg/kg BW/day for 474572 compounds.
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Affiliation(s)
- Caroline L. Ring
- National Center for Computational Toxicology, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
- Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831
| | - Jon A. Arnot
- ARC Arnot Research and Consulting, 36 Sproat Ave. Toronto, ON, Canada, M4M 1W4
- Department of Physical & Environmental Sciences, University of Toronto Scarborough 1265 Military Trail, Toronto, ON, Canada, M1C 1A4
- Department of Pharmacology and Toxicology, University of Toronto, 1 King’s College Cir, Toronto, ON, Canada, M5S 1A8
| | - Deborah H. Bennett
- Department of Public Health Sciences, University of California, Davis, California, 95616
| | - Peter P. Egeghy
- National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - Peter Fantke
- Quantitative Sustainability Assessment Division, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Lei Huang
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109
| | - Kristin K. Isaacs
- National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - Olivier Jolliet
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109
| | - Katherine A. Phillips
- National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - Paul S. Price
- National Exposure Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - Hyeong-Moo Shin
- Department of Earth and Environmental Sciences, University of Texas, Arlington, Texas, 76019
| | - John N. Westgate
- ARC Arnot Research and Consulting, 36 Sproat Ave. Toronto, ON, Canada, M4M 1W4
| | - R. Woodrow Setzer
- National Center for Computational Toxicology, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - John F. Wambaugh
- National Center for Computational Toxicology, Office of Research and Development, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
- Corresponding Author: John F. Wambaugh, 109 T.W. Alexander Dr, NC 27711, USA, , Phone: (919) 541-7641
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28
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Pharmacokinetics, Tissue Distribution and Excretion of a Novel Diuretic (PU-48) in Rats. Pharmaceutics 2018; 10:pharmaceutics10030124. [PMID: 30096833 PMCID: PMC6160999 DOI: 10.3390/pharmaceutics10030124] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 07/21/2018] [Accepted: 07/27/2018] [Indexed: 01/02/2023] Open
Abstract
Methyl 3-amino-6-methoxythieno [2,3-b] quinoline-2-carboxylate (PU-48) is a novel diuretic urea transporter inhibitor. The aim of this study is to investigate the profile of plasma pharmacokinetics, tissue distribution, and excretion by oral dosing of PU-48 in rats. Concentrations of PU-48 within biological samples are determined using a validated high performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) method. After oral administration of PU-48 (3, 6, and 12 mg/kg, respectively) in self-nanomicroemulsifying drug delivery system (SNEDDS) formulation, the peak plasma concentrations (Cmax), and the area under the curve (AUC0⁻∞) were increased by the dose-dependent and linear manner, but the marked different of plasma half-life (t1/2) were not observed. This suggests that the pharmacokinetic profile of PU-48 prototype was first-order elimination kinetic characteristics within the oral three doses range in rat plasma. Moreover, the prototype of PU-48 was rapidly and extensively distributed into thirteen tissues, especially higher concentrations were detected in stomach, intestine, liver, kidney, and bladder. The total accumulative excretion of PU-48 in the urine, feces, and bile was less than 2%. This research is the first report on disposition via oral administration of PU-48 in rats, and it provides important information for further development of PU-48 as a diuretic drug candidate.
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29
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Patlewicz G, Wambaugh JF, Felter SP, Simon TW, Becker RA. Utilizing Threshold of Toxicological Concern (TTC) with High Throughput Exposure Predictions (HTE) as a Risk-Based Prioritization Approach for thousands of chemicals. ACTA ACUST UNITED AC 2018; 7:58-67. [PMID: 31338483 DOI: 10.1016/j.comtox.2018.07.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Regulatory agencies across the world are facing the challenge of performing risk-based prioritization of thousands of chemicals in commerce. Here, we present an approach using the Threshold of Toxicological Concern (TTC) combined with heuristic high-throughput exposure (HTE) modelling to rank order chemicals for further evaluation. Accordingly, for risk-based prioritization, chemicals with exposures > TTC would be ranked as higher priority for further evaluation whereas substances with exposures < TTC would be ranked as lower priority. An initial proof of concept, using a dataset of 7986 substances with previously modeled median and upper 95% credible interval (UCI) total daily median exposure rates showed fewer than 5% of substances had UCI exposures > the Cramer Class III TTC (1.5 μg/kg-day). We extended the analysis by profiling the same dataset through the TTC workflow published by Kroes et al (2004) which accounts for known exclusions to the TTC as well as structural alerts. UCI exposures were then compared to the appropriate class-specific TTC. None of the substances categorized as Cramer Class I or Cramer Class II exceeded their respective TTC values and no more than 2% of substances categorized as Cramer Class III or acetylcholinesterase inhibitors exceeded their respective TTC values. The modeled UCI exposures for the majority of the 1853 chemicals with genotoxicity structural alerts did exceed the TTC of 0.0025 μg/kg-day, but only 79 substances exceeded this TTC if median exposure values were used. For substances for which UCI exposures exceeded relevant TTC values, we highlight possible approaches for consideration to refine the HTE : TTC approach. Overall, coupling TTC with HTE offers promise as a pragmatic first step in ranking substances as part of a risk-based prioritization approach.
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Affiliation(s)
- Grace Patlewicz
- National Center for Computational Toxicology (NCCT), Office of Research and Development, US Environmental Protection Agency, 109 TW Alexander Dr, Research Triangle Park, NC 27711, USA
| | - John F Wambaugh
- National Center for Computational Toxicology (NCCT), Office of Research and Development, US Environmental Protection Agency, 109 TW Alexander Dr, Research Triangle Park, NC 27711, USA
| | - Susan P Felter
- Procter & Gamble, Central Product Safety, Mason, OH 45040, USA
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31
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Khoury C, Werry K, Haines D, Walker M, Malowany M. Human biomonitoring reference values for some non-persistent chemicals in blood and urine derived from the Canadian Health Measures Survey 2009–2013. Int J Hyg Environ Health 2018; 221:684-696. [DOI: 10.1016/j.ijheh.2018.03.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 03/10/2018] [Accepted: 03/13/2018] [Indexed: 02/05/2023]
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32
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Barbeau D, Lutier S, Choisnard L, Marques M, Persoons R, Maitre A. Urinary trans-anti-7,8,9,10-tetrahydroxy-7,8,9,10-tetrahydrobenzo(a)pyrene as the most relevant biomarker for assessing carcinogenic polycyclic aromatic hydrocarbons exposure. ENVIRONMENT INTERNATIONAL 2018; 112:147-155. [PMID: 29272778 DOI: 10.1016/j.envint.2017.12.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 11/21/2017] [Accepted: 12/07/2017] [Indexed: 06/07/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAH) are ubiquitous pollutants present as complex mixtures in the environment. Among them, benzo(a)pyrene (BaP) is classified as carcinogenic to humans by the International Agency of Research on Cancer. Taking into account all absorption ways, human biomonitoring allows PAH exposure assessment, but biomarkers both specific to carcinogenic effect and sufficiently sensitive are lacking. In this work, we proposed the urinary 7,8,9,10-tetrahydroxy-7,8,9,10-tetrahydrobenzo(a)pyrene (7,8,9,10-OHBaP) stemming from hydrolysis of BaP-7,8-diol-9,10-epoxide, the ultimate carcinogenic BaP metabolite, as biomarker of PAH exposure. A simple and highly sensitive analytical method, with a limit of quantification (LQ) reaching 0.06pmol/L (0.02ng/L), was described and validated. The relevance of urinary 7,8,9,10-OHBaP concentrations adjustment by creatinine was demonstrated. In a group of 24 non-occupationally PAH exposed subjects, only 15% of 7,8,9,10-OHBaP levels was below the LQ and the last daily void has been found as the best sampling time. Tobacco consumption had a significant positive effect on 7,8,9,10-OHBaP concentrations with a 90e percentile equal to 0.05nmole/mole creatinine (nmol/mol) and 0.03nmol/mol for smokers and non-smokers, respectively. In case of occupational PAH exposure, all the pre- and post-shift urinary 7,8,9,10-OHBaP levels of 7 non-smoking workers in a prebaked electrodes production plant were above the LQ. Concentrations ranged from 0.05 to 0.91nmol/mol and accumulation of 7,8,9,10-OHBaP into organism of workers during the working week was clearly observed. The best sampling time was the post-shift at the end of week but samples should also be collected at pre-shift the beginning of week to assess the background level. Finally, the urinary 7,8,9,10-OHBaP elimination kinetic through the weekend was studied using non-linear mixed effect modelling. Mean apparent urinary half-life was 31.5h with low inter-individual variability. Describing key characteristics of urinary 7,8,9,10-OHBaP as PAH exposure biomarker, this work should promote its use for future large-scale biomonitoring campaigns.
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Affiliation(s)
- Damien Barbeau
- EPSP, TIMC-IMAG, CNRS UMR 5525, Université Grenoble Alpes, F-38000 Grenoble, France; Laboratoire de Toxicologie Professionnelle et Environnementale, DBTP, IBP, CHU Grenoble Alpes, F-38000 Grenoble, France.
| | - Simon Lutier
- EPSP, TIMC-IMAG, CNRS UMR 5525, Université Grenoble Alpes, F-38000 Grenoble, France.
| | - Luc Choisnard
- Département de Pharmacochimie Moléculaire, CNRS UMR 5063, Université Grenoble Alpes, F-38000 Grenoble, France.
| | - Marie Marques
- EPSP, TIMC-IMAG, CNRS UMR 5525, Université Grenoble Alpes, F-38000 Grenoble, France.
| | - Renaud Persoons
- EPSP, TIMC-IMAG, CNRS UMR 5525, Université Grenoble Alpes, F-38000 Grenoble, France; Laboratoire de Toxicologie Professionnelle et Environnementale, DBTP, IBP, CHU Grenoble Alpes, F-38000 Grenoble, France.
| | - Anne Maitre
- EPSP, TIMC-IMAG, CNRS UMR 5525, Université Grenoble Alpes, F-38000 Grenoble, France; Laboratoire de Toxicologie Professionnelle et Environnementale, DBTP, IBP, CHU Grenoble Alpes, F-38000 Grenoble, France.
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Aylward LL, Irwin K, St-Amand A, Nong A, Hays SM. Screening-level Biomonitoring Equivalents for tiered interpretation of urinary 3-phenoxybenzoic acid (3-PBA) in a risk assessment context. Regul Toxicol Pharmacol 2018; 92:29-38. [DOI: 10.1016/j.yrtph.2017.11.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 10/03/2017] [Accepted: 11/02/2017] [Indexed: 10/18/2022]
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Pleil JD, Wallace MAG, Stiegel MA, Funk WE. Human biomarker interpretation: the importance of intra-class correlation coefficients (ICC) and their calculations based on mixed models, ANOVA, and variance estimates. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2018; 21:161-180. [PMID: 30067478 PMCID: PMC6704467 DOI: 10.1080/10937404.2018.1490128] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Human biomonitoring is the foundation of environmental toxicology, community public health evaluation, preclinical health effects assessments, pharmacological drug development and testing, and medical diagnostics. Within this framework, the intra-class correlation coefficient (ICC) serves as an important tool for gaining insight into human variability and responses and for developing risk-based assessments in the face of sparse or highly complex measurement data. The analytical procedures that provide data for clinical and public health efforts are continually evolving to expand our knowledge base of the many thousands of environmental and biomarker chemicals that define human systems biology. These chemicals range from the smallest molecules from energy metabolism (i.e., the metabolome), through larger molecules including enzymes, proteins, RNA, DNA, and adducts. In additiona, the human body contains exogenous environmental chemicals and contributions from the microbiome from gastrointestinal, pulmonary, urogenital, naso-pharyngeal, and skin sources. This complex mixture of biomarker chemicals from environmental, human, and microbiotic sources comprise the human exposome and generally accessed through sampling of blood, breath, and urine. One of the most difficult problems in biomarker assessment is assigning probative value to any given set of measurements as there are generally insufficient data to distinguish among sources of chemicals such as environmental, microbiotic, or human metabolism and also deciding which measurements are remarkable from those that are within normal human variability. The implementation of longitudinal (repeat) measurement strategies has provided new statistical approaches for interpreting such complexities, and use of descriptive statistics based upon intra-class correlation coefficients (ICC) has become a powerful tool in these efforts. This review has two parts; the first focuses on the history of repeat measures of human biomarkers starting with occupational toxicology of the early 1950s through modern applications in interpretation of the human exposome and metabolic adverse outcome pathways (AOPs). The second part reviews different methods for calculating the ICC and explores the strategies and applications in light of different data structures.
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Affiliation(s)
- Joachim D. Pleil
- Office of Research and Development, US Environmental Protection Agency (EPA), Research Triangle Park, NC, USA
| | - M. Ariel Geer Wallace
- Office of Research and Development, US Environmental Protection Agency (EPA), Research Triangle Park, NC, USA
| | - Matthew A. Stiegel
- Department of Occupational and Environmental Safety, Duke University Medical Center, Durham, NC, USA
| | - William E. Funk
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
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Aylward LL, Hays SM, Zidek A. Variation in urinary spot sample, 24 h samples, and longer-term average urinary concentrations of short-lived environmental chemicals: implications for exposure assessment and reverse dosimetry. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2017; 27:582-590. [PMID: 27703149 PMCID: PMC5658679 DOI: 10.1038/jes.2016.54] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 08/21/2016] [Indexed: 05/20/2023]
Abstract
Population biomonitoring data sets such as the Canadian Health Measures Survey (CHMS) and the United States National Health and Nutrition Examination Survey (NHANES) collect and analyze spot urine samples for analysis for biomarkers of exposure to non-persistent chemicals. Estimation of population intakes using such data sets in a risk-assessment context requires consideration of intra- and inter-individual variability to understand the relationship between variation in the biomarker concentrations and variation in the underlying daily and longer-term intakes. Two intensive data sets with a total of 16 individuals with collection and measurement of serial urine voids over multiple days were used to examine these relationships using methyl paraben, triclosan, bisphenol A (BPA), monoethyl phthalate (MEP), and mono-2-ethylhexyl hydroxyl phthalate (MEHHP) as example compounds. Composited 24 h voids were constructed mathematically from the individual collected voids, and concentrations for each 24 h period and average multiday concentrations were calculated for each individual in the data sets. Geometric mean and 95th percentiles were compared to assess the relationship between distributions in spot sample concentrations and the 24 h and multiday collection averages. In these data sets, spot sample concentrations at the 95th percentile were similar to or slightly higher than the 95th percentile of the distribution of all 24 h composite void concentrations, but tended to overestimate the maximum of the multiday concentration averages for most analytes (usually by less than a factor of 2). These observations can assist in the interpretation of population distributions of spot samples for frequently detected analytes with relatively short elimination half-lives.
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Affiliation(s)
- Lesa L Aylward
- Summit Toxicology, LLP, Falls Church, Virginia, USA
- Summit Toxicology, LLP, 6343 Carolyn Drive, Falls Church, VA 22044 USA. E-mail:
| | - Sean M Hays
- Summit Toxicology, LLP, Bozeman, Montana, USA
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Risk assessment and Biomonitoring Equivalent for 2-ethylhexyl-2,3,4,5 tetrabromobenzoate (TBB) and tetrabromobenzoic acid (TBBA). Regul Toxicol Pharmacol 2017; 89:186-192. [DOI: 10.1016/j.yrtph.2017.07.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 07/20/2017] [Accepted: 07/23/2017] [Indexed: 01/20/2023]
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Abstract
Arylamines and nitroarenes are intermediates in the production of pharmaceuticals, dyes, pesticides, and plastics and are important environmental and occupational pollutants. N-Hydroxyarylamines are the toxic common intermediates of arylamines and nitroarenes. N-Hydroxyarylamines and their derivatives can form adducts with hemoglobin (Hb-adducts), albumin, DNA, and tissue proteins in a dose-dependent manner. Most of the arylamine Hb-adducts are labile and undergo hydrolysis in vitro, by mild acid or base, to form the arylamines. According to current knowledge of arylamine adduct-formation, the hydrolyzable fraction is derived from the reaction products of the arylnitroso derivatives that yield arylsulfinamide adducts with cysteine. Hb-adducts are markers for the bioavailability of N-hydroxyarylamines. Hb-adducts of arylamines and nitroarenes have been used for many biomonitoring studies for over 30 years. Hb-adducts reflect the exposure history of the last four months. Biomonitoring of urinary metabolites is a less invasive process than biomonitoring blood protein adducts, and urinary metabolites have served as short-lived biomarkers of exposure to these hazardous chemicals. However, in case of intermittent exposure, urinary metabolites may not be detected, and subjects may be misclassified as nonexposed. Arylamines and nitroarenes and/or their metabolites have been measured in urine, especially to monitor the exposure of workers. This review summarizes the results of human biomonitoring studies involving urinary metabolites and Hb-adducts of arylamines and nitroarenes. In addition, studies about the relationship between Hb-adducts and diseases are summarized.
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Affiliation(s)
- Gabriele Sabbioni
- Institute of Environmental and Occupational Toxicology , Casella Postale 108, CH-6780 Airolo, Switzerland.,Alpine Institute of Chemistry and Toxicology , CH-6718 Olivone, Switzerland.,Walther-Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität , D-80336 München, Germany
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38
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Cequier E, Sakhi AK, Haug LS, Thomsen C. Exposure to organophosphorus pesticides in Norwegian mothers and their children: Diurnal variability in concentrations of their biomarkers and associations with food consumption. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 590-591:655-662. [PMID: 28284640 DOI: 10.1016/j.scitotenv.2017.03.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 03/01/2017] [Accepted: 03/02/2017] [Indexed: 06/06/2023]
Abstract
Several studies have suggested that exposure to organophosphorus (OP) pesticides is detrimental for health, and in particular for children where moderate doses may have a negative impact on the neurodevelopment. This study surveys levels of the 6 non-specific urinary metabolites (dialkyl phosphates (DAPs)) of OP pesticides in Norwegian mothers (n=48) and their children (n=54), and examines the diurnal variation in concentrations as well as associations with consumption of specific food products. The highest median concentration measured in urine was found for dimethyl thiophosphate (5.3 and 5.5ng/mLSG; specific gravity corrected) for both children and mothers, respectively, followed by diethyl phosphate (3.8 and 5.3ng/mLSG, respectively). The intra-class correlation coefficients of DAPs among mothers were moderate (0.49-0.68), and consumption of fruit explained between 8% and 55% of the variations in the mothers' and their children's urinary DAP concentrations.
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Affiliation(s)
- Enrique Cequier
- Department of Environmental Exposure and Epidemiology, Norwegian Institute of Public Health, P.O. Box 4404, Nydalen, 0403 Oslo, Norway.
| | - Amrit Kaur Sakhi
- Department of Environmental Exposure and Epidemiology, Norwegian Institute of Public Health, P.O. Box 4404, Nydalen, 0403 Oslo, Norway
| | - Line Småstuen Haug
- Department of Environmental Exposure and Epidemiology, Norwegian Institute of Public Health, P.O. Box 4404, Nydalen, 0403 Oslo, Norway
| | - Cathrine Thomsen
- Department of Environmental Exposure and Epidemiology, Norwegian Institute of Public Health, P.O. Box 4404, Nydalen, 0403 Oslo, Norway
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39
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Barbeau D, Lutier S, Marques M, Persoons R, Maitre A. Comparison of gaseous polycyclic aromatic hydrocarbon metabolites according to their specificity as biomarkers of occupational exposure: Selection of 2-hydroxyfluorene and 2-hydroxyphenanthrene. JOURNAL OF HAZARDOUS MATERIALS 2017; 332:185-194. [PMID: 28324712 DOI: 10.1016/j.jhazmat.2017.03.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 02/09/2017] [Accepted: 03/05/2017] [Indexed: 06/06/2023]
Abstract
Exposure to Polycyclic Aromatic Hydrocarbons (PAHs) occurs by respiratory, digestive and dermal absorption. Biomonitoring takes all pathways into account but sensitive and specific biomarkers are required. Different gaseous PAHs metabolites were used due to their abundance in the atmospheric mixtures but none of them were selected as better biomarker than the others. To identify the best candidates for assessing occupational airborne exposure, relation between atmospheric levels of Naphtalene, Fluorene and Phenanthrene and urinary metabolites concentrations was studied in a carbon electrode workers group. Linear mixed effects models were built to select explanatory variables and estimate variance component. Urinary creatinine was a predictor of metabolites levels confirming the importance of diuresis for interpreting results. High significance of pre-shift sampling time combined with positive coefficients of post-shift indicated that urine should be sampled at the end of the workday in association with pre-shift urine to avoid misinterpretations. Among the 10 metabolites studied, urinary 2-hydroxyfluorene and 2-hydroxyphenanthrene showed the highest increase of variance explained by models after inclusion of individual atmospheric levels as explanatory variable. Priority could be given to 2-hydroxyfluorene due to higher excretion levels than 2-hydroxyphenanthrene.
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Affiliation(s)
- Damien Barbeau
- EPSP-TIMC (CNRS UMR 5525), Université Grenoble Alpes, TIMC-IMAG, F-38000 Grenoble, France; Laboratoire de Toxicologie Professionnelle et Environnementale, DBTP, CHU de Grenoble, France.
| | - Simon Lutier
- EPSP-TIMC (CNRS UMR 5525), Université Grenoble Alpes, TIMC-IMAG, F-38000 Grenoble, France.
| | - Marie Marques
- EPSP-TIMC (CNRS UMR 5525), Université Grenoble Alpes, TIMC-IMAG, F-38000 Grenoble, France.
| | - Renaud Persoons
- EPSP-TIMC (CNRS UMR 5525), Université Grenoble Alpes, TIMC-IMAG, F-38000 Grenoble, France; Laboratoire de Toxicologie Professionnelle et Environnementale, DBTP, CHU de Grenoble, France.
| | - Anne Maitre
- EPSP-TIMC (CNRS UMR 5525), Université Grenoble Alpes, TIMC-IMAG, F-38000 Grenoble, France; Laboratoire de Toxicologie Professionnelle et Environnementale, DBTP, CHU de Grenoble, France.
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40
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Poddalgoda D, Macey K, Assad H, Krishnan K. Development of biomonitoring equivalents for barium in urine and plasma for interpreting human biomonitoring data. Regul Toxicol Pharmacol 2017; 86:303-311. [DOI: 10.1016/j.yrtph.2017.03.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 03/23/2017] [Accepted: 03/25/2017] [Indexed: 10/19/2022]
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41
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Chang JW, Lee CC, Pan WH, Chou WC, Huang HB, Chiang HC, Huang PC. Estimated Daily Intake and Cumulative Risk Assessment of Phthalates in the General Taiwanese after the 2011 DEHP Food Scandal. Sci Rep 2017; 7:45009. [PMID: 28327585 PMCID: PMC5361203 DOI: 10.1038/srep45009] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 02/20/2017] [Indexed: 01/06/2023] Open
Abstract
A food scandal occurred in Taiwan in 2011 because the DEHP (di-2-ethylhexyl phthalate) had been intentionally used in food products. We assessed the daily intakes (DIs) and cumulative risk of phthalates in Taiwan’s general population after the scandal. The DIs of 6 phthalates, including di-n-butyl phthalate (DnBP), di-iso-butyl phthalate (DiBP), and DEHP, were evaluated using urinary phthalate metabolites. Hazard quotients of phthalates classified as affecting the reproductive (HQrep) and hepatic (HQhep) systems were assessed using cumulative approach. The creatinine-based model showed that the highest DI values in children 7-to 12- years-old were for DEHP (males: median: 4.79 μg/kg bw/d; females: median: 2.62 μg/kg bw/d). The 95th percentile (P95) of HQrep values were all >1 in the 7- to 12-year-old and 18- to 40-year-old male groups. The P95 of HQhep values were all >1 in the 7- to 18- year-old male groups. Most of the HQrep was attributable to the HQs of DnBP and DiBP (53.9–84.7%), and DEHP contributed most to HQhep (83.1–98.6%), which reveals that DnBP, DiBP and DEHP were the main risk of phthalate exposure for Taiwanese. Taiwan’s general population is widely exposed to DnBP, DiBP and DEHP, especially for young children.
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Affiliation(s)
- Jung-Wei Chang
- Research Center for Environmental Trace Toxic Substances, National Cheng Kung University, Tainan, Taiwan
| | - Ching-Chang Lee
- Research Center for Environmental Trace Toxic Substances, National Cheng Kung University, Tainan, Taiwan.,Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Wen-Harn Pan
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan.,Division of Preventive Medicine and Health Service Research, Institute of Population Health Sciences, National Health Research Institutes, Miaoli, Taiwan
| | - Wei-Chun Chou
- National Environmental Health Research Center, National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli, Taiwan
| | - Han-Bin Huang
- School of Public Health, National Defense Medical Center, Taipei, Taiwan
| | - Hung-Che Chiang
- National Environmental Health Research Center, National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli, Taiwan
| | - Po-Chin Huang
- National Environmental Health Research Center, National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli, Taiwan.,Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Safety, Health and Environmental Engineering, National United University, Miaoli, Taiwan
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42
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Poddalgoda D, Macey K, Jayawardene I, Krishnan K. Derivation of biomonitoring equivalent for inorganic tin for interpreting population-level urinary biomonitoring data. Regul Toxicol Pharmacol 2016; 81:430-436. [PMID: 27693705 DOI: 10.1016/j.yrtph.2016.09.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 09/23/2016] [Accepted: 09/27/2016] [Indexed: 11/25/2022]
Abstract
Population-level biomonitoring of tin in urine has been conducted by the U.S. National Health and Nutrition Examination Survey (NHANES) and the National Nutrition and Health Study (ENNS - Étude nationale nutrition santé) in France. The general population is predominantly exposed to inorganic tin from the consumption of canned food and beverages. The National Institute for Public Health and the Environment of the Netherlands (RIVM) has established a tolerable daily intake (TDI) for chronic exposure to inorganic tin based on a NOAEL of 20 mg/kg bw per day from a 2-year feeding study in rats. Using a urinary excretion fraction (0.25%) from a controlled human study along with a TDI value of 0.2 mg/kg bw per day, a Biomonitoring Equivalent (BE) was derived for urinary tin (26 μg/g creatinine or 20 μg/L urine). The geometric mean and the 95th percentile tin urine concentrations of the general population in U.S. (0.705 and 4.5 μg/g creatinine) and France (0.51 and 2.28 μg/g creatinine) are below the BE associated with the TDI, indicating that the population exposure to inorganic tin is below the exposure guidance value of 0.2 mg/kg bw per day. Overall, the robustness of pharmacokinetic data forming the basis of the urinary BE development is medium. The availability of internal dose and kinetic data in the animal species forming the basis of the assessment could improve the overall confidence in the present assessment.
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43
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Hays SM, Macey K, Poddalgoda D, Lu M, Nong A, Aylward LL. Biomonitoring Equivalents for molybdenum. Regul Toxicol Pharmacol 2016; 77:223-9. [PMID: 26972837 DOI: 10.1016/j.yrtph.2016.03.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 03/04/2016] [Accepted: 03/06/2016] [Indexed: 10/22/2022]
Abstract
Molybdenum is an essential trace element for mammalian, plant, and other animal systems. The Institute of Medicine (IOM) has established an Estimated Average Requirement (EAR) to assure sufficient molybdenum intakes for human populations; however excessive exposures can cause toxicity. As a result, several agencies have established exposure guidance values to protect against molybdenum toxicity, including a Reference Dose (RfD), Tolerable Daily Intake (TDI) and a Tolerable Upper Intake Level (UL). Biomonitoring for molybdenum in blood or urine in the general population is being conducted by the Canadian Health Measures Survey (CHMS) and the U.S. National Health and Nutrition Examination Survey (NHANES). Using pharmacokinetic data from controlled human dosing studies, Biomonitoring Equivalents (BEs) were calculated for molybdenum in plasma, whole blood, and urine associated with exposure guidance values set to protect against both nutritional deficits and toxicity. The BEEAR values in plasma, whole blood and urine are 0.5, 0.45 and 22 μg/L, respectively. The BEs associated with toxicity range from 0.9 to 31 μg/L in plasma, 0.8-28 μg/L in whole blood and 200-7500 μg/L in urine. These values can be used to interpret molybdenum biomonitoring data from a nutritional and toxicity perspective.
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Affiliation(s)
- Sean M Hays
- Summit Toxicology, LLP, Lyons, CO 90540, USA.
| | | | | | - Ming Lu
- Health Canada, Ottawa, ON, Canada
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44
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Terry C, Hays S, McCoy AT, McFadden LG, Aggarwal M, Rasoulpour RJ, Juberg DR. Implementing a framework for integrating toxicokinetics into human health risk assessment for agrochemicals. Regul Toxicol Pharmacol 2016; 75:89-104. [DOI: 10.1016/j.yrtph.2015.10.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 10/01/2015] [Accepted: 10/04/2015] [Indexed: 01/25/2023]
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45
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Pleil JD, Sobus JR. Estimating central tendency from a single spot measure: A closed-form solution for lognormally distributed biomarker data for risk assessment at the individual level. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2016; 79:837-47. [PMID: 27587289 DOI: 10.1080/15287394.2016.1193108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Exposure-based risk assessment employs large cross-sectional data sets of environmental and biomarker measurements to predict population statistics for adverse health outcomes. The underlying assumption is that long-term (many years) latency health problems including cancer, autoimmune and cardiovascular disease, diabetes, and asthma are triggered by lifetime exposures to environmental stressors that interact with the genome. The aim of this study was to develop a specific predictive method that provides the statistical parameters for chronic exposure at the individual level based upon a single spot measurement and knowledge of global summary statistics as derived from large data sets. This is a profound shift in exposure and health statistics in that it begins to answer the question "How large is my personal risk?" rather than just providing an overall population-based estimate. This approach also holds value for interpreting exposure-based risks for small groups of individuals within a community in comparison to random individuals from the general population.
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Affiliation(s)
- Joachim D Pleil
- a Human Exposure and Atmospheric Sciences Division, NERL/ORD, U.S. Environmental Protection Agency , Research Triangle Park , North Carolina , USA
| | - Jon R Sobus
- a Human Exposure and Atmospheric Sciences Division, NERL/ORD, U.S. Environmental Protection Agency , Research Triangle Park , North Carolina , USA
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46
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Analytical methods for the determination of biomarkers of exposure to phthalates in human urine samples. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2015.06.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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47
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Brown K, Phillips M, Grulke C, Yoon M, Young B, McDougall R, Leonard J, Lu J, Lefew W, Tan YM. Reconstructing exposures from biomarkers using exposure-pharmacokinetic modeling – A case study with carbaryl. Regul Toxicol Pharmacol 2015; 73:689-98. [DOI: 10.1016/j.yrtph.2015.10.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 10/29/2015] [Accepted: 10/29/2015] [Indexed: 12/14/2022]
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48
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Heffernan AL, Baduel C, Toms LML, Calafat AM, Ye X, Hobson P, Broomhall S, Mueller JF. Use of pooled samples to assess human exposure to parabens, benzophenone-3 and triclosan in Queensland, Australia. ENVIRONMENT INTERNATIONAL 2015; 85:77-83. [PMID: 26368661 PMCID: PMC5537729 DOI: 10.1016/j.envint.2015.09.001] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 08/28/2015] [Accepted: 09/01/2015] [Indexed: 05/22/2023]
Abstract
Parabens, benzophenone-3 and triclosan are common ingredients used as preservatives, ultraviolet radiation filters and antimicrobial agents, respectively. Human exposure occurs through consumption of processed food and use of cosmetics and consumer products. The aim of this study was to provide a preliminary characterisation of exposure to selected personal care product chemicals in the general Australian population. De-identified urine specimens stratified by age and sex were obtained from a community-based pathology laboratory and pooled (n=24 pools of 100). Concentrations of free and total (sum of free plus conjugated) species of methyl, ethyl, propyl and butyl paraben, benzophenone-3 and triclosan were quantified using isotope dilution tandem mass spectrometry; with geometric means 232, 33.5, 60.6, 4.32, 61.5 and 87.7ng/mL, respectively. Age was inversely associated with paraben concentration, and females had concentrations approximately two times higher than males. Total paraben and benzophenone-3 concentrations are significantly higher than reported worldwide, and the average triclosan concentration was more than one order of magnitude higher than in many other populations. This study provides the first data on exposure of the general Australian population to a range of common personal care product chemical ingredients, which appears to be prevalent and warrants further investigation.
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Affiliation(s)
- A L Heffernan
- National Research Centre for Environmental Toxicology, University of Queensland, Brisbane, QLD, Australia.
| | - C Baduel
- National Research Centre for Environmental Toxicology, University of Queensland, Brisbane, QLD, Australia.
| | - L M L Toms
- Queensland University of Technology, School of Public Health and Social Work and Institute of Health and Biomedical Innovation, Brisbane, QLD, Australia.
| | - A M Calafat
- Centers for Disease Control and Prevention, Atlanta, GA, USA.
| | - X Ye
- Centers for Disease Control and Prevention, Atlanta, GA, USA.
| | - P Hobson
- Sullivan Nicolaides Pathology Taringa, QLD, Australia.
| | - S Broomhall
- The Department of Environment, Canberra, ACT, Australia.
| | - J F Mueller
- National Research Centre for Environmental Toxicology, University of Queensland, Brisbane, QLD, Australia.
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Aylward LL, Hays SM. Interpreting biomonitoring data for 2,4-dichlorophenoxyacetic acid: Update to Biomonitoring Equivalents and population biomonitoring data. Regul Toxicol Pharmacol 2015; 73:765-9. [PMID: 26577196 DOI: 10.1016/j.yrtph.2015.11.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 10/29/2015] [Accepted: 11/03/2015] [Indexed: 11/19/2022]
Abstract
Urinary biomonitoring data for 2,4-dichlorophenoxyacetic acid (2,4-D) reflect aggregate population exposures to trace 2,4-D residues in diet and the environment. These data can be interpreted in the context of current risk assessments by comparison to a Biomonitoring Equivalent (BE), which is an estimate of the average biomarker concentration consistent with an exposure guidance value such as the US EPA Reference Dose (RfD). BE values are updated here from previous published BE values to reflect a change in the US EPA RfD. The US EPA RfD has been updated to reflect a revised point of departure (POD) based on new information from additional toxicological studies and updated assessment of applicable uncertainty factors. In addition, new biomonitoring data from both the US National Health and Nutrition Examination Survey (NHANES) and the Canadian Health Measures Survey (CHMS) have been published. The updated US EPA chronic RfD of 0.21 mg/kg-d results in updated BE values of 10,500 and 7000 μg/L for adults and children, respectively. Comparison of the current population-representative data to these BE values shows that upper bound population biomarker concentrations are more than 5000-fold below BE values corresponding to the updated US EPA RfD. This biomonitoring-based risk assessment supports the conclusion that current use patterns in the US and Canada result in incidental exposures in the general population that can be considered negligible in the context of the current 2,4-D risk assessment.
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Affiliation(s)
- L L Aylward
- Summit Toxicology, LLP, Falls Church, VA, USA.
| | - S M Hays
- Summit Toxicology, LLP, Lyons, CO, USA
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50
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Metabolism of benzo(a)pyrene by aortic subcellular fractions in the setting of abdominal aortic aneurysms. Mol Cell Biochem 2015; 411:383-91. [PMID: 26530167 DOI: 10.1007/s11010-015-2600-2] [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: 09/16/2015] [Accepted: 10/29/2015] [Indexed: 10/22/2022]
Abstract
As exposure to polycyclic aromatic hydrocarbons (PAHs; a family of environmental toxicants) have been implicated in cardiovascular diseases, the ability of the aortic tissue to process these toxicants is important from the standpoint of abdominal aortic aneurysms and atherosclerosis. Benzo(a)pyrene (B(a)P), a representative PAH compound is released into the environment from automobile exhausts, industrial emissions, and considerable intake of B(a)P is also expected in people who are smokers and barbecued red meat eaters. Therefore, knowledge of B(a)P metabolism in the cardiovascular system will be of importance in the management of vascular disorders. Toward this end, subcellular fractions (nuclear, cytosolic, mitochondrial, and microsomal) were isolated from the aortic tissues of Apo E mice that received a 5 mg/kg/week of B(a)P for 42 days and 0.71 mg/kg/day for 60 days. The fractions were incubated with 1 and 3 μM B(a)P. Post incubation, samples were extracted with ethyl acetate and analyzed by reverse-phase HPLC. Microsomal B(a)P metabolism was greater than the rest of the fractions. The B(a)P metabolite levels generated by all the subcellular fractions showed a B(a)P exposure concentration-dependent increase for both the weekly and daily B(a)P treatment categories. The preponderance of B(a)P metabolites such as 7,8-dihydrodiol, 3,6-, and 6,12-dione metabolites are interesting due to their reported involvement in B(a)P-induced toxicity through oxidative stress.
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