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Pang J, Huang Y, Liu Y, Huang W. Applications of ion chromatography in urine analysis: A review. J Chromatogr A 2023; 1706:464231. [PMID: 37517316 DOI: 10.1016/j.chroma.2023.464231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 07/17/2023] [Accepted: 07/19/2023] [Indexed: 08/01/2023]
Abstract
Ion chromatography (IC) plays a crucial role in urine analysis for diverse medical diagnoses. This paper reviews a comprehensive investigation into urine pretreatment techniques, as well as the design and development of IC systems for the measurement of various chemicals. Prior to analysis, urine samples commonly undergo pretreatment procedures such as dilution, filtration, purification, and concentration. These steps effectively eliminate interfering factors and facilitate the accurate and sensitive analysis of ultra-trace components. To separate and quantify different chemical elements or ions present in urine, a range of homemade or commercially available columns coupled with various detectors were employed. This study focuses on the analysis of chemicals such as heavy metals, halogens, pesticides, drugs, and other essential or toxic substances by IC methods.
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Affiliation(s)
- Jiafeng Pang
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430078, Hubei, China
| | - Yongming Huang
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430078, Hubei, China
| | - Yanli Liu
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430078, Hubei, China
| | - Weixiong Huang
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430078, Hubei, China.
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García Torres E, Pérez Morales R, González Zamora A, Ríos Sánchez E, Olivas Calderón EH, Alba Romero JDJ, Calleros Rincón EY. Consumption of water contaminated by nitrate and its deleterious effects on the human thyroid gland: a review and update. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2022; 32:984-1001. [PMID: 32866080 DOI: 10.1080/09603123.2020.1815664] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 08/22/2020] [Indexed: 06/11/2023]
Abstract
Nowadays, the nitrates have been established as carcinogenic components due to the endogenous formation of N-nitroso compounds, however, the consumption of water contaminated with nitrates has only been strongly related to the presence of methemoglobinemia in infants, as an acute effect, leaving out other side effects that demand attention. The thyroid gland takes relevance because it can be altered by many pollutants known as endocrine disruptors, which are agents capable of interfering with the synthesis of hormones, thus far, it is known that nitrates may disrupt the amount of iodine uptake causing most of the time hypothyroidism and affecting the metabolic functions of the organism in all development stages, resulting in an important health burden for the exposed population. Here, this review and update highlighted the impact of consumption of water contaminated with nitrates and effects on the thyroid gland in humans, concluding that nitrates could act as true endocrine disruptor.
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Affiliation(s)
- Edgar García Torres
- Doctorado en Ciencias Biomédicas. Facultad de Ciencias Químicas, Universidad Juárez del Estado de Durango, Gómez Palacio, Durango, México
| | - Rebeca Pérez Morales
- Facultad de Ciencias Químicas, Universidad Juárez del Estado de Durango, Gómez Palacio, Durango, México
| | - Alberto González Zamora
- Laboratorio de Biología Evolutiva, Facultad de Ciencias Biológicas, Universidad Juárez del Estado de Durango, Gómez Palacio, Durango, México
| | - Efraín Ríos Sánchez
- Doctorado en Ciencias Biomédicas. Facultad de Ciencias Químicas, Universidad Juárez del Estado de Durango, Gómez Palacio, Durango, México
| | | | - José de Jesús Alba Romero
- Facultad de Ciencias Químicas, Universidad Juárez del Estado de Durango, Gómez Palacio, Durango, México
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Benefit-risk analysis for foods (BRAFO): Evaluation of exposure to dietary nitrates. Food Chem Toxicol 2018; 120:709-723. [PMID: 30134152 DOI: 10.1016/j.fct.2018.08.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 07/29/2018] [Accepted: 08/17/2018] [Indexed: 01/07/2023]
Abstract
Dietary nitrate has been associated with health benefits as well as potential risks, thus presenting a paradox for consumers and health professionals. To address the issue, we applied the Benefit-Risk Analysis for Foods (BRAFO) framework to evaluate dietary exposure to nitrate by considering how the risks and benefits might vary under the reference scenario of the acceptable daily intake (ADI) set forth by JECFA (3.7 mg/kg-day), or under an alternative scenario of a higher ADI (independently developed herein). Results demonstrated that risk, as conservatively characterized by various toxicological benchmarks, was present at levels ranging from the current ADI value of 3.7 mg/kg-day (lowest end of the range) to >15 mg/kg-day. When these ADI values, both established by regulatory bodies as well as independently herein were compared to intakes associated with benefits (decreased blood pressure observed following repeated exposure to nitrates ∼4-18 mg/kg-day), along with considerations of current dietary exposures associated with healthy diets, the alternative scenario allowed for benefits without incurring additional risk. For consumers aged 12 weeks and older, ADI values ∼12-17 mg/kg-day-based on more reliable data than used to derive the current ADI-allow benefits to be realized while still protecting public health. The assessment serves as a case study in how benefits can be considered in a risk assessment paradigm for foods, thus providing useful information to decision makers.
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Mortensen A, Aguilar F, Crebelli R, Di Domenico A, Dusemund B, Frutos MJ, Galtier P, Gott D, Gundert-Remy U, Lambré C, Leblanc JC, Lindtner O, Moldeus P, Mosesso P, Oskarsson A, Parent-Massin D, Stankovic I, Waalkens-Berendsen I, Woutersen RA, Wright M, van den Brandt P, Fortes C, Merino L, Toldrà F, Arcella D, Christodoulidou A, Barrucci F, Garcia A, Pizzo F, Battacchi D, Younes M. Re-evaluation of sodium nitrate (E 251) and potassium nitrate (E 252) as food additives. EFSA J 2017; 15:e04787. [PMID: 32625505 PMCID: PMC7010087 DOI: 10.2903/j.efsa.2017.4787] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The Panel on Food Additives and Nutrient Sources added to Food (ANS) provided a scientific opinion re-evaluating the safety of sodium nitrate (E 251) and potassium nitrate (E 252) when used as food additives. The current acceptable daily intakes (ADIs) for nitrate of 3.7 mg/kg body weight (bw) per day were established by the SCF (1997) and JECFA (2002). The available data did not indicate genotoxic potential for sodium and potassium nitrate. The carcinogenicity studies in mice and rats were negative. The Panel considered the derivation of an ADI for nitrate based on the formation of methaemoglobin, following the conversion of nitrate, excreted in the saliva, to nitrite. However, there were large variations in the data on the nitrate-to-nitrite conversion in the saliva in humans. Therefore, the Panel considered that it was not possible to derive a single value of the ADI from the available data. The Panel noticed that even using the highest nitrate-to-nitrite conversion factor the methaemoglobin levels produced due to nitrite obtained from this conversion would not be clinically significant and would result to a theoretically estimated endogenous N-nitroso compounds (ENOC) production at levels which would be of low concern. Hence, and despite the uncertainty associated with the ADI established by the SCF, the Panel concluded that currently there was insufficient evidence to withdraw this ADI. The exposure to nitrate solely from its use as a food additive was estimated to be less than 5% of the overall exposure to nitrate in food based on a refined estimated exposure scenario. This exposure did not exceed the current ADI (SCF, 1997). However, if all sources of exposure to dietary nitrate are considered (food additive, natural presence and contamination), the ADI would be exceeded for all age groups at the mean and the highest exposure.
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Mervish NA, Pajak A, Teitelbaum SL, Pinney SM, Windham GC, Kushi LH, Biro FM, Valentin-Blasini L, Blount BC, Wolff MS. Thyroid Antagonists (Perchlorate, Thiocyanate, and Nitrate) and Childhood Growth in a Longitudinal Study of U.S. Girls. ENVIRONMENTAL HEALTH PERSPECTIVES 2016; 124:542-549. [PMID: 26151950 PMCID: PMC4829993 DOI: 10.1289/ehp.1409309] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 07/02/2015] [Indexed: 05/29/2023]
Abstract
BACKGROUND Perchlorate, thiocyanate, and nitrate are sodium/iodide symporter (NIS) inhibitors that block iodide uptake into the thyroid, thus affecting thyroid function. Thyroid dysfunction can adversely affect somatic growth and development in children. To our knowledge, no studies have examined effects of NIS inhibitors on body size measures. OBJECTIVE We investigated associations between NIS inhibitors and childhood growth in 940 girls from the Puberty Study of the Breast Cancer and Environment Research Program. METHODS Urine samples collected from girls 6-8 years of age at enrollment (2004-2007) from New York City, greater Cincinnati, Ohio, and the Bay Area in California were analyzed for NIS inhibitors and creatinine (C). The longitudinal association between NIS inhibitors and anthropometric measures [height, waist circumference, and body mass index (BMI)] during at least three visits was examined using mixed effects linear models, adjusted for race and site. RESULTS Compared with girls in the low-exposure group (3.6, 626, and 500 mg/gC, median perchlorate, thiocyanate, and nitrate, respectively) girls with the highest NIS inhibitor exposure (9.6, 2,343, and 955 mg/gC, median perchlorate, thiocyanate, and nitrate, respectively) had slower growth in waist circumference and BMI but not height. Significant differences in the predicted mean waist circumference and BMI between the low- and high-exposure groups were observed beginning at 11 years of age. CONCLUSIONS Higher NIS inhibitor exposure biomarkers were associated with reductions in waist circumference and BMI. These findings underscore the need to assess exposure to NIS inhibitors with respect to their influence on childhood growth. CITATION Mervish NA, Pajak A, Teitelbaum SL, Pinney SM, Windham GC, Kushi LH, Biro FM, Valentin-Blasini L, Blount BC, Wolff MS, for the Breast Cancer and Environment Research Project (BCERP). 2016. Thyroid antagonists (perchlorate, thiocyanate, and nitrate) and childhood growth in a longitudinal study of U.S. girls. Environ Health Perspect 124:542-549; http://dx.doi.org/10.1289/ehp.1409309.
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Affiliation(s)
- Nancy A. Mervish
- Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Ashley Pajak
- Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Susan L. Teitelbaum
- Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Susan M. Pinney
- University of Cincinnati College of Medicine, Department of Environmental Health, Cincinnati, Ohio, USA
| | - Gayle C. Windham
- Environmental Health Investigations Branch, California Department of Public Health, Richmond, California, USA
| | | | - Frank M. Biro
- Division of Adolescent Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Liza Valentin-Blasini
- National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Benjamin C. Blount
- National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Mary S. Wolff
- Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
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Cengiz MF, Bilgin AK. Determination of major sodium iodide symporter (NIS) inhibitors in drinking waters using ion chromatography with conductivity detector. J Pharm Biomed Anal 2016; 120:190-7. [DOI: 10.1016/j.jpba.2015.12.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 12/09/2015] [Accepted: 12/15/2015] [Indexed: 11/25/2022]
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Bahadoran Z, Mirmiran P, Ghasemi A, Kabir A, Azizi F, Hadaegh F. Is dietary nitrate/nitrite exposure a risk factor for development of thyroid abnormality? A systematic review and meta-analysis. Nitric Oxide 2015; 47:65-76. [PMID: 25889269 DOI: 10.1016/j.niox.2015.04.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Revised: 04/06/2015] [Accepted: 04/08/2015] [Indexed: 12/15/2022]
Abstract
The potential effects of inorganic nitrate/nitrite on global health are a much debated issue. In addition to possible methemoglobinemia and carcinogenic properties, anti-thyroid effects of nitrate/nitrite have been suggested. Considering the growing significance of nitrate/nitrite and since there is no comprehensive review in data available, clarifying the effect of nitrate/nitrite on thyroid disorder outcomes is essential. Therefore, we conducted this systematic review of experimental and clinical studies, and a meta-analysis of relevant cohort and cross-sectional studies investigating the association of nitrate/nitrite exposure and thyroid function. Most animal studies show that high exposure (~10-600 times of acceptable daily intake) to nitrate/nitrite induces anti-thyroid effects, including decreased serum level of thyroid hormones and histomorphological changes in thyroid gland; however no similar observations have been documented in humans. Based on our meta-analysis, no significant association was observed between nitrate exposure and the risk of thyroid cancer, hyper- and hypothyroidism; findings from three cohort studies however showed a significant association between higher exposure to nitrite and the risk of thyroid cancer (risk = 1.48, 95% confidence interval = 1.09-2.02, P = 0.012). Additional research is needed to clarify the association between nitrate/nitrite exposures and both thyroid function and cancer.
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Affiliation(s)
- Zahra Bahadoran
- Nutrition and Endocrine Research Center, Obesity Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Parvin Mirmiran
- Department of Clinical Nutrition and Dietetics, Faculty of Nutrition Sciences and Food Technology, National Nutrition and Food Technology Research Institute, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Asghar Ghasemi
- Endocrine Physiology Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Ali Kabir
- Minimally Invasive Surgery Research Center; Iran University of Medical Sciences, Tehran, Iran; Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fereidoun Azizi
- Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Farzad Hadaegh
- Prevention of Metabolic Disorders Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Turcios S, Lence-Anta JJ, Santana JL, Pereda CM, Velasco M, Chappe M, Infante I, Bustillo M, García A, Clero E, Maillard S, Rodriguez R, Xhaard C, Ren Y, Rubino C, Ortiz RM, de Vathaire F. Thyroid volume and its relation to anthropometric measures in a healthy cuban population. Eur Thyroid J 2015; 4:55-61. [PMID: 25960963 PMCID: PMC4404892 DOI: 10.1159/000371346] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 12/02/2014] [Indexed: 01/20/2023] Open
Abstract
OBJECTIVES The aim of this study was to describe the thyroid volume in healthy adults by ultrasound and to correlate this volume with some anthropometric measures and other differentiated thyroid cancer risk factors. STUDY DESIGN Thyroid volume and anthropometric measures were recorded in a sample of 100 healthy adults, including 21 men and 79 women aged 18-50 years, living in a non-iodine-deficient area of Havana city. RESULTS The average thyroid volume was 6.6 ± 0.26 ml; it was higher in men (7.3 ml) than in women (6.4 ml; p = 0.15). In the univariate analysis, thyroid volume was correlated with all anthropometric measures, but in the multivariate analysis, body surface area was found to be the only significant anthropometric parameter. Thyroid volume was also higher in current or former smokers and in persons with blood group AB or B. CONCLUSION Specific reference values of thyroid volume as a function of body surface area could be used for evaluating thyroid volume in clinical practice. The relation between body surface area and thyroid volume is coherent with what is known about the relation of thyroid volume to thyroid cancer risk, but the same is not true about the relation between thyroid volume and smoking habit.
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Affiliation(s)
| | | | | | | | | | - Mae Chappe
- Institute of Oncology and Radiobiology, Havana, Cuba
| | | | | | - Anabel García
- Institute of Oncology and Radiobiology, Havana, Cuba
| | - Enora Clero
- Radiation Epidemiology Group, Unit 1018-Inserm, Villejuif, France
- The Gustave Roussy Cancer Center, Villejuif, France
- Paris-Sud University, Villejuif, France
| | - Stephane Maillard
- Radiation Epidemiology Group, Unit 1018-Inserm, Villejuif, France
- The Gustave Roussy Cancer Center, Villejuif, France
- Paris-Sud University, Villejuif, France
| | | | - Constance Xhaard
- Radiation Epidemiology Group, Unit 1018-Inserm, Villejuif, France
- The Gustave Roussy Cancer Center, Villejuif, France
- Paris-Sud University, Villejuif, France
| | - Yan Ren
- Radiation Epidemiology Group, Unit 1018-Inserm, Villejuif, France
- The Gustave Roussy Cancer Center, Villejuif, France
- Paris-Sud University, Villejuif, France
| | - Carole Rubino
- Radiation Epidemiology Group, Unit 1018-Inserm, Villejuif, France
- The Gustave Roussy Cancer Center, Villejuif, France
- Paris-Sud University, Villejuif, France
| | - Rosa M. Ortiz
- Institute of Oncology and Radiobiology, Havana, Cuba
| | - Florent de Vathaire
- Radiation Epidemiology Group, Unit 1018-Inserm, Villejuif, France
- The Gustave Roussy Cancer Center, Villejuif, France
- Paris-Sud University, Villejuif, France
- *Florent de Vathaire, PhD, Radiation Epidemiology Group, 1018 INSERM Unit, Institut Gustave Roussy, Rue Edouard Vaillant, FR-94805 Villejuif (France), E-Mail
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Abstract
Genetic and a large number of environmental non-iodine-related factors play a role in the cause of nodular goitre. Most evidence for the influence of genetic and environmental factors in the cause of goitre is from cross-sectional, population-based studies. Only a few studies have included prospective data on risk factors for nodular goitre, although few prospective data are available on the effect of iodine and tobacco smoking on goitre development. Goitre is not one single phenotype. Many epidemiological studies do not distinguish diffuse from nodular goitre, as the investigated parameter is often thyroid volume or frequency with increased thyroid volume. Moreover, information on the presence and effect of gene-environment, gene-gene, and environment-environment effect modifications is limited. Thus, firm conclusions about the relative contributions and causality of the investigated risk factors should be made with caution. Smoking seems to be an established risk factor for nodular goitre, possibly with effect modification from iodine intake, as the risk associated with smoking is smaller or absent in areas with sufficient iodine intake. The use of oral contraceptives might have protective effects against goitre, and childbirth is an increased risk factor for goitre in areas with non-optimal iodine intake. Insulin resistance is a recently investigated risk factor, and the risk of goitre may be reversible with metformin treatment. Iodine remains the major environmental risk factor for nodular goitre.
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Affiliation(s)
- Nils Knudsen
- Department of Endocrinology, Bispebjerg University Hospital, 2400 Copenhagen NV, Denmark.
| | - Thomas Heiberg Brix
- Department of Endocrinology and Metabolism, Odense University Hospital, 5000 Odense C, Denmark
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Đaković M, Vinković M, Roca S, Popović Z, Vicković I, Vikić-Topić D, Lukač J, Đaković N, Kusić Z. Structural study of picolinamide complexes of Ni(II), Zn(II), Cd(II), and Hg(II) nitrates in solid state and solution. J COORD CHEM 2012. [DOI: 10.1080/00958972.2012.663912] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Marijana Đaković
- a Laboratory of General and Inorganic Chemistry , Department of Chemistry, Faculty of Science, University of Zagreb , Horvatovac 102a , HR-10000 Zagreb , Croatia
| | - Marijana Vinković
- b NMR Centre , Ruđer Bošković Institute , Bijenička cesta 54 , HR-10000 Zagreb , Croatia
| | - Sunčica Roca
- b NMR Centre , Ruđer Bošković Institute , Bijenička cesta 54 , HR-10000 Zagreb , Croatia
| | - Zora Popović
- a Laboratory of General and Inorganic Chemistry , Department of Chemistry, Faculty of Science, University of Zagreb , Horvatovac 102a , HR-10000 Zagreb , Croatia
| | - Ivan Vicković
- a Laboratory of General and Inorganic Chemistry , Department of Chemistry, Faculty of Science, University of Zagreb , Horvatovac 102a , HR-10000 Zagreb , Croatia
| | - Dražen Vikić-Topić
- b NMR Centre , Ruđer Bošković Institute , Bijenička cesta 54 , HR-10000 Zagreb , Croatia
| | - Josip Lukač
- c Department of Oncology and Nuclear Medicine , University Hospital Center “Sestre Milosrdnice”, School of Medicine, University of Zagreb , Vinogradska cesta 29 , HR-10000 Zagreb , Croatia
| | - Nikola Đaković
- c Department of Oncology and Nuclear Medicine , University Hospital Center “Sestre Milosrdnice”, School of Medicine, University of Zagreb , Vinogradska cesta 29 , HR-10000 Zagreb , Croatia
- d Croatian Academy of Sciences and Arts , Zrinjski trg 11 , HR-10000 Zagreb , Croatia
| | - Zvonko Kusić
- c Department of Oncology and Nuclear Medicine , University Hospital Center “Sestre Milosrdnice”, School of Medicine, University of Zagreb , Vinogradska cesta 29 , HR-10000 Zagreb , Croatia
- d Croatian Academy of Sciences and Arts , Zrinjski trg 11 , HR-10000 Zagreb , Croatia
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Hartoft-Nielsen ML, Boas M, Bliddal S, Rasmussen AK, Main K, Feldt-Rasmussen U. Do Thyroid Disrupting Chemicals Influence Foetal Development during Pregnancy? J Thyroid Res 2011; 2011:342189. [PMID: 21918727 PMCID: PMC3170895 DOI: 10.4061/2011/342189] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 05/13/2011] [Accepted: 06/02/2011] [Indexed: 11/20/2022] Open
Abstract
Maternal euthyroidism during pregnancy is crucial for normal development and, in particular, neurodevelopment of the foetus. Up to 3.5 percent of pregnant women suffer from hypothyroidism. Industrial use of various chemicals—endocrine disrupting chemicals (EDCs)—has been shown to cause almost constant exposure of humans with possible harmful influence on health and hormone regulation. EDCs may affect thyroid hormone homeostasis by different mechanisms, and though the effect of each chemical seems scarce, the added effects may cause inappropriate consequences on, for example, foetal neurodevelopment.
This paper focuses on thyroid hormone influence on foetal development in relation to the chemicals suspected of thyroid disrupting properties with possible interactions with maternal thyroid homeostasis. Knowledge of the effects is expected to impact the general debate on the use of these chemicals. However, more studies are needed to elucidate the issue, since human studies are scarce.
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Affiliation(s)
- Marie-Louise Hartoft-Nielsen
- Department of Medical Endocrinology PE-2131, Rigshospitalet, University Hospital of Copenhagen, 2100 Copenhagen, Denmark
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Risk factors of thyroid tumors: role of environmental and occupational exposures to chemical pollutants. Rev Epidemiol Sante Publique 2010; 58:359-67. [PMID: 20980113 DOI: 10.1016/j.respe.2010.05.005] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Revised: 05/10/2010] [Accepted: 05/17/2010] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND The rising incidence of thyroid cancer observed during the last few decades in most western countries is explained in large part by increasing numbers of diagnoses due to changes in medical screening practices. However, beside radiation exposure, exposure to environmental chemicals may also play a role in thyroid cancer etiology and in the increased incidence. This paper presents the main chemicals suspected to induce thyroid tumorigenesis, and epidemiological results on the association between chemical exposure and thyroid tumors. METHODS We reviewed experimental studies to identify the main chemicals possibly involved in thyroid tumorigenesis. We also reviewed the main epidemiological studies investigating the association between environmental chemical exposure and thyroid neoplasm in humans. RESULTS Environmentally abundant chemicals may disrupt thyroid function and/or play a role in tumorigenesis through a variety of mechanisms. Epidemiological results provide insufficient evidence of a causal link between exposure to environmental chemicals and thyroid tumors, but raise the hypothesis of an increased risk of thyroid neoplasm for workers in the leather, wood, and paper industries, and those exposed to certain solvents and pesticides. CONCLUSION This paper highlights the need for large epidemiological studies evaluating the exposure to various groups of environmental chemicals and its impact on the thyroid gland.
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Abstract
Common environmental exposures may affect thyroid function in humans. Foetuses and infants are most vulnerable to these effects because they need thyroid hormone for normal neurodevelopment. Perchlorate, thiocyanate and nitrate are all competitive inhibitors of the sodium/iodine symporter (NIS) in pharmacologic doses, but their effects on human thyroid function at environmental exposure levels remain unclear. Many compounds, including polychlorinated biphenyls (PCBs), polybrominated diphenylethers (PBDEs), bisphenol-A (BPA) and triclosan, may have direct actions on the thyroid hormone receptor, but these effects are complex and are not yet well understood. Isoflavones inhibit thyroperoxidase (TPO) activity, and, therefore, may cause goitre and hypothyroidism if ingested at high levels, particularly in iodine-deficient individuals. Organochlorine pesticides and dioxins may decrease serum T(4) half-life by activating hepatic enzymes. Additional studies are needed to further elucidate the risk posed by these and other potentially thyroid-disrupting compounds.
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Affiliation(s)
- Elizabeth N Pearce
- Section of Endocrinology, Diabetes, and Nutrition, Boston University Medical Center, 88 East Newton street, Evans 201, Boston, MA 02118, USA.
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