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Xiao T, Huang Z, Zheng C, Quach B, Zhu Y, Li F, Liang W, Baker J, Reichetzeder C, Hocher B, Yang Y. Associations of bisphenol A exposure with metabolic syndrome and its components: A systematic review and meta-analysis. Obes Rev 2024; 25:e13738. [PMID: 38491337 DOI: 10.1111/obr.13738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 01/21/2024] [Accepted: 02/13/2024] [Indexed: 03/18/2024]
Abstract
Mounting evidence shows that bisphenol A (BPA) is associated with metabolic risk factors. The aim of this study was to review related epidemiologic studies and conduct a meta-analysis to quantitatively estimate the association between BPA and metabolic syndrome. Four electronic databases were systematically searched to identify suitable articles. A total of 47 published studies were finally included. Two studies involved metabolic syndrome. Of the 17, 17, 14, and 13 studies on the relationship between BPA with abdominal obesity, blood pressure, fasting plasma glucose, and dyslipidemia, 10, 6, 3, and 4 studies were included in the meta-analysis, respectively. The results showed that the risk of abdominal obesity increased with the increase of BPA exposure, especially in the group with higher BPA exposure levels (Quartile 2 vs. Quartile 1, pooled OR = 1.16, 95%CI: 1.01, 1.33; Q3 vs. Q1, pooled OR = 1.31, 95%CI: 1.13, 1.51; Q4 vs. Q1, pooled OR = 1.40, 95%CI: 1.21, 1.61). However, there was no significant correlation between BPA exposure and metabolic syndrome components including hypertension, abnormal fasting plasma glucose, and dyslipidemia. The present study found that BPA exposure is significantly associated with a higher risk of abdominal obesity. However, the relationship between BPA with metabolic syndrome and its other components needs further longitudinal studies to verify.
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Affiliation(s)
- Tianli Xiao
- Key Laboratory of Molecular Epidemiology of Hunan Province, School of Medicine, Hunan Normal University, Changsha, China
- The Institute of Interdisciplinary Studies, Hunan Normal University, Changsha, China
| | - Zehua Huang
- Key Laboratory of Molecular Epidemiology of Hunan Province, School of Medicine, Hunan Normal University, Changsha, China
- The Institute of Interdisciplinary Studies, Hunan Normal University, Changsha, China
| | - Chanjuan Zheng
- Key Laboratory of Molecular Epidemiology of Hunan Province, School of Medicine, Hunan Normal University, Changsha, China
- The Institute of Interdisciplinary Studies, Hunan Normal University, Changsha, China
| | - Binh Quach
- Centre for Health and Exercise Science Research, Hong Kong Baptist University, Hong Kong, China
| | - Yulian Zhu
- Hunan Prevention and Treatment Institute for Occupational Diseases, Changsha, China
| | - Feifei Li
- Centre for Health and Exercise Science Research, Hong Kong Baptist University, Hong Kong, China
- Department of Sport, Physical Education and Health, Hong Kong Baptist University, Hong Kong, China
| | - Wei Liang
- School of Physical Education, Shenzhen University, Shenzhen, China
| | - Julien Baker
- Centre for Health and Exercise Science Research, Hong Kong Baptist University, Hong Kong, China
- Department of Sport, Physical Education and Health, Hong Kong Baptist University, Hong Kong, China
| | - Christoph Reichetzeder
- Institute of Nutritional Science, University of Potsdam, Potsdam, Germany
- HMU - Health and Medical University, Potsdam, Germany
| | - Berthold Hocher
- Fifth Department of Medicine (Nephrology/Endocrinology/Rheumatology), University Medical Centre Mannheim, University of Heidelberg, Mannheim, Germany
- Institute of Medical Diagnostics, IMD, Berlin, Germany
- Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-XIANGYA, Changsha, China
| | - Yide Yang
- Key Laboratory of Molecular Epidemiology of Hunan Province, School of Medicine, Hunan Normal University, Changsha, China
- The Institute of Interdisciplinary Studies, Hunan Normal University, Changsha, China
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Toledano JM, Puche-Juarez M, Moreno-Fernandez J, Gonzalez-Palacios P, Rivas A, Ochoa JJ, Diaz-Castro J. Implications of Prenatal Exposure to Endocrine-Disrupting Chemicals in Offspring Development: A Narrative Review. Nutrients 2024; 16:1556. [PMID: 38892490 PMCID: PMC11173790 DOI: 10.3390/nu16111556] [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: 04/24/2024] [Revised: 05/16/2024] [Accepted: 05/17/2024] [Indexed: 06/21/2024] Open
Abstract
During the last decades, endocrine-disrupting chemicals (EDCs) have attracted the attention of the scientific community, as a result of a deepened understanding of their effects on human health. These compounds, which can reach populations through the food chain and a number of daily life products, are known to modify the activity of the endocrine system. Regarding vulnerable groups like pregnant mothers, the potential damage they can cause increases their importance, since it is the health of two lives that is at risk. EDCs can affect the gestation process, altering fetal development, and eventually inducing the appearance of many disorders in their childhood and/or adulthood. Because of this, several of these substances have been studied to clarify the influence of their prenatal exposure on the cognitive and psychomotor development of the newborn, together with the appearance of non-communicable diseases and other disorders. The most novel research on the subject has been gathered in this narrative review, with the aim of clarifying the current knowledge on the subject. EDCs have shown, through different studies involving both animal and human investigation, a detrimental effect on the development of children exposed to the during pregnancy, sometimes with sex-specific outcomes. However, some other studies have failed to find these associations, which highlights the need for deeper and more rigorous research, that will provide an even more solid foundation for the establishment of policies against the extended use of these chemicals.
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Affiliation(s)
- Juan M. Toledano
- Department of Physiology, Faculty of Pharmacy, Campus Universitario de Cartuja, University of Granada, 18071 Granada, Spain; (J.M.T.); (J.J.O.); (J.D.-C.)
- Institute of Nutrition and Food Technology “José Mataix Verdú”, University of Granada, 18071 Granada, Spain;
- Nutrition and Food Sciences Ph.D. Program, University of Granada, 18071 Granada, Spain
| | - Maria Puche-Juarez
- Department of Physiology, Faculty of Pharmacy, Campus Universitario de Cartuja, University of Granada, 18071 Granada, Spain; (J.M.T.); (J.J.O.); (J.D.-C.)
- Institute of Nutrition and Food Technology “José Mataix Verdú”, University of Granada, 18071 Granada, Spain;
- Nutrition and Food Sciences Ph.D. Program, University of Granada, 18071 Granada, Spain
| | - Jorge Moreno-Fernandez
- Department of Physiology, Faculty of Pharmacy, Campus Universitario de Cartuja, University of Granada, 18071 Granada, Spain; (J.M.T.); (J.J.O.); (J.D.-C.)
- Institute of Nutrition and Food Technology “José Mataix Verdú”, University of Granada, 18071 Granada, Spain;
- Instituto de Investigación Biosanitaria (IBS), 18016 Granada, Spain;
| | - Patricia Gonzalez-Palacios
- Institute of Nutrition and Food Technology “José Mataix Verdú”, University of Granada, 18071 Granada, Spain;
- Department of Nutrition and Food Science, University of Granada, 18071 Granada, Spain
| | - Ana Rivas
- Instituto de Investigación Biosanitaria (IBS), 18016 Granada, Spain;
- Department of Nutrition and Food Science, University of Granada, 18071 Granada, Spain
| | - Julio J. Ochoa
- Department of Physiology, Faculty of Pharmacy, Campus Universitario de Cartuja, University of Granada, 18071 Granada, Spain; (J.M.T.); (J.J.O.); (J.D.-C.)
- Institute of Nutrition and Food Technology “José Mataix Verdú”, University of Granada, 18071 Granada, Spain;
- Instituto de Investigación Biosanitaria (IBS), 18016 Granada, Spain;
| | - Javier Diaz-Castro
- Department of Physiology, Faculty of Pharmacy, Campus Universitario de Cartuja, University of Granada, 18071 Granada, Spain; (J.M.T.); (J.J.O.); (J.D.-C.)
- Institute of Nutrition and Food Technology “José Mataix Verdú”, University of Granada, 18071 Granada, Spain;
- Instituto de Investigación Biosanitaria (IBS), 18016 Granada, Spain;
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Zhang S, Dai L, Wan Z, Huang Z, Zou M, Guan H. Sex-specific associations of bisphenol A and its substitutes with body fat distribution among US adults: NHANES 2011-2016. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:7948-7958. [PMID: 38172318 DOI: 10.1007/s11356-023-31589-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 12/12/2023] [Indexed: 01/05/2024]
Abstract
Bisphenol A (BPA) and its structural analogs (bisphenol S (BPS) and bisphenol F (BPF)) are widely consumed endocrine disrupting chemicals that may contribute to the etiology of obesity. To date, few studies have directly investigated the sex-related associations between bisphenols and body fat distribution in adults. In this study, we included 2669 participants from the National Health and Nutrition Examination Survey (NHANES) 2011-2016 to evaluate and compare sex-specific differences of the associations of BPA, BPS, and BPF with body fat distribution. We found that there were significant positive correlations between BPS and body fat indices (STFAT [adjustedβ=1.94, 95% CI: (0.24, 3.64)], TAF [0.18 (0.04, 0.32)], SAT [0.15 (0.03, 0.27)], android fat mass [0.20 (0.004, 0.40)], BMI [1.63 (0.61, 2.65)], and WC [3.19 (0.64, 5.73)] in the highest quartiles of BPS), but not in BPA and BPF. Stratified analyses suggested that the significant associations of BPS with body fat indices were stronger in women than men (STFAT [adjustedβ=3.75, 95% CI: (1.04, 6.45) vs. adjustedβ=-0.06, 95% CI: (-2.23, 2.11), P for interaction < 0.001], TAF [ 0.32 (0.09, 0.54) vs. 0.01 (-0.17, 0.19), P for interaction < 0.001], SAT [0.27 (0.09, 0.45) vs. 0.01 (-0.14, 0.16), P for interaction < 0.001], android fat mass [0.41 (0.12, 0.71) vs. -0.02 (-0.28, 0.24), P for interaction < 0.001], gynoid fat mass [0.56 (0.11, 1.01) vs. -0.05 (-0.41, 0.31), P for interaction = 0.002], BMI [2.76 (1.08, 4.44) vs. 0.47 (-0.80, 1.74), P for interaction < 0.001], and WC [5.51 (1.44, 9.58) vs. 0.61 (-2.67, 3.88), P for interaction < 0.001]), and positive associations between BPS with fat distribution were also observed in non-smoking women. Our study indicated that in women, higher concentration of urinary BPS was associated with increased body fat accumulation, except for visceral adipose tissue mass. These findings emphasize the role of environmental BPS exposure in the increasing fat deposits, and confirm the need for more prospective cohort studies on a sex-specific manner.
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Affiliation(s)
- Shili Zhang
- Department of Endocrinology, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, 510080, China
| | - Lingyan Dai
- Global Health Research Center, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Southern Medical University, Guangzhou, 510080, China
| | - Ziyu Wan
- Department of Endocrinology, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, 510080, China
| | - Zhiwei Huang
- Department of Epidemiology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, 510515, China
| | - Mengchen Zou
- Department of Endocrinology and Metabolism, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Haixia Guan
- Department of Endocrinology, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, 510080, China.
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Gebru YA, Pang MG. Modulatory effects of bisphenol A on the hepatic immune response. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 336:122430. [PMID: 37611793 DOI: 10.1016/j.envpol.2023.122430] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/16/2023] [Accepted: 08/19/2023] [Indexed: 08/25/2023]
Abstract
The liver is a primary line of defense for protection from external substances next to the intestinal barrier. As a result, the hepatic immune system plays a central role in liver pathophysiology. Bisphenol A (BPA) is one of the most common endocrine disrupting chemicals and is primarily metabolized in the liver. Due to its ability to bind to estrogen receptors, BPA is well known to possess estrogenic activity and disrupt reproductive functions. The phase I and Phase II metabolism reactions of BPA mainly occur in the liver with the help of enzymes including cytochrome P450 (CYP), uridine 5'-diphospho-glucuronosyltransferase-glucuronosyltransferases, sulfotransferases, and glutathione-S-transferases. Although the majority of BPA is excreted after conjugation by these enzymes, untransformed BPA induces the production of reactive oxygen species through disruption of the enzymatic complex CYP, lipid accumulation, mitochondrial dysfunction, endoplasmic reticulum stress and inflammatory injury in the liver. Moreover, it has been proposed to possess a potential immunomodulatory effect. Indeed, several in vivo and in vitro studies have reported that low doses of BPA increase the population of T cells with type 1 T helper (Th1), Th2, and Th17 cells. Although the current literature lacks clear evidence on the mechanisms by which BPA is involved in T cell mediated immune responses, recent multi-omics studies suggest that it may directly interact with the antigen processing and presentation pathways. In this review, we first discuss the metabolism of BPA in the liver, before exploring currently available data on its effects on liver injury. Finally, we review its modulatory effects on the hepatic immune response, as well as potential mechanisms. By conducting this review, we aim to improve understanding on the relationship between BPA exposure and immune-related liver injury, with a focus on the antigen processing and presentation pathway and T cell-mediated response in the liver.
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Affiliation(s)
- Yoseph Asmelash Gebru
- Department of Animal Science & Technology and BET Research Institute, Chung-Ang University, Anseong, Gyeonggi-do, 17546, Republic of Korea
| | - Myung-Geol Pang
- Department of Animal Science & Technology and BET Research Institute, Chung-Ang University, Anseong, Gyeonggi-do, 17546, Republic of Korea.
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Khalil WJ, Akeblersane M, Khan AS, Moin ASM, Butler AE. Environmental Pollution and the Risk of Developing Metabolic Disorders: Obesity and Diabetes. Int J Mol Sci 2023; 24:ijms24108870. [PMID: 37240215 DOI: 10.3390/ijms24108870] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 04/25/2023] [Accepted: 05/13/2023] [Indexed: 05/28/2023] Open
Abstract
To meet the increased need for food and energy because of the economic shift brought about by the Industrial Revolution in the 19th century, there has been an increase in persistent organic pollutants (POPs), atmospheric emissions and metals in the environment. Several studies have reported a relationship between these pollutants and obesity, and diabetes (type 1, type 2 and gestational). All of the major pollutants are considered to be endocrine disruptors because of their interactions with various transcription factors, receptors and tissues that result in alterations of metabolic function. POPs impact adipogenesis, thereby increasing the prevalence of obesity in exposed individuals. Metals impact glucose regulation by disrupting pancreatic β-cells, causing hyperglycemia and impaired insulin signaling. Additionally, a positive association has been observed between the concentration of endocrine disrupting chemicals (EDCs) in the 12 weeks prior to conception and fasting glucose levels. Here, we evaluate what is currently known regarding the link between environmental pollutants and metabolic disorders. In addition, we indicate where further research is required to improve our understanding of the specific effects of pollutants on these metabolic disorders which would enable implementation of changes to enable their prevention.
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Affiliation(s)
- William Junior Khalil
- School of Medicine, Royal College of Surgeons in Ireland Bahrain, Busaiteen 15503, Bahrain
| | - Meriem Akeblersane
- School of Medicine, Royal College of Surgeons in Ireland Bahrain, Busaiteen 15503, Bahrain
| | - Ana Saad Khan
- School of Medicine, Royal College of Surgeons in Ireland Bahrain, Busaiteen 15503, Bahrain
| | - Abu Saleh Md Moin
- Research Department, Royal College of Surgeons in Ireland Bahrain, Busaiteen 15503, Bahrain
| | - Alexandra E Butler
- Research Department, Royal College of Surgeons in Ireland Bahrain, Busaiteen 15503, Bahrain
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Lambré C, Barat Baviera JM, Bolognesi C, Chesson A, Cocconcelli PS, Crebelli R, Gott DM, Grob K, Lampi E, Mengelers M, Mortensen A, Rivière G, Silano (until 21 December 2020†) V, Steffensen I, Tlustos C, Vernis L, Zorn H, Batke M, Bignami M, Corsini E, FitzGerald R, Gundert‐Remy U, Halldorsson T, Hart A, Ntzani E, Scanziani E, Schroeder H, Ulbrich B, Waalkens‐Berendsen D, Woelfle D, Al Harraq Z, Baert K, Carfì M, Castoldi AF, Croera C, Van Loveren H. Re-evaluation of the risks to public health related to the presence of bisphenol A (BPA) in foodstuffs. EFSA J 2023; 21:e06857. [PMID: 37089179 PMCID: PMC10113887 DOI: 10.2903/j.efsa.2023.6857] [Citation(s) in RCA: 31] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2023] Open
Abstract
In 2015, EFSA established a temporary tolerable daily intake (t-TDI) for BPA of 4 μg/kg body weight (bw) per day. In 2016, the European Commission mandated EFSA to re-evaluate the risks to public health from the presence of BPA in foodstuffs and to establish a tolerable daily intake (TDI). For this re-evaluation, a pre-established protocol was used that had undergone public consultation. The CEP Panel concluded that it is Unlikely to Very Unlikely that BPA presents a genotoxic hazard through a direct mechanism. Taking into consideration the evidence from animal data and support from human observational studies, the immune system was identified as most sensitive to BPA exposure. An effect on Th17 cells in mice was identified as the critical effect; these cells are pivotal in cellular immune mechanisms and involved in the development of inflammatory conditions, including autoimmunity and lung inflammation. A reference point (RP) of 8.2 ng/kg bw per day, expressed as human equivalent dose, was identified for the critical effect. Uncertainty analysis assessed a probability of 57-73% that the lowest estimated Benchmark Dose (BMD) for other health effects was below the RP based on Th17 cells. In view of this, the CEP Panel judged that an additional uncertainty factor (UF) of 2 was needed for establishing the TDI. Applying an overall UF of 50 to the RP, a TDI of 0.2 ng BPA/kg bw per day was established. Comparison of this TDI with the dietary exposure estimates from the 2015 EFSA opinion showed that both the mean and the 95th percentile dietary exposures in all age groups exceeded the TDI by two to three orders of magnitude. Even considering the uncertainty in the exposure assessment, the exceedance being so large, the CEP Panel concluded that there is a health concern from dietary BPA exposure.
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Ahn C, Jeung EB. Endocrine-Disrupting Chemicals and Disease Endpoints. Int J Mol Sci 2023; 24:ijms24065342. [PMID: 36982431 PMCID: PMC10049097 DOI: 10.3390/ijms24065342] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 02/24/2023] [Indexed: 03/18/2023] Open
Abstract
Endocrine-disrupting chemicals (EDCs) have significant impacts on biological systems, and have been shown to interfere with physiological systems, especially by disrupting the hormone balance. During the last few decades, EDCs have been shown to affect reproductive, neurological, and metabolic development and function and even stimulate tumor growth. EDC exposure during development can disrupt normal development patterns and alter susceptibility to disease. Many chemicals have endocrine-disrupting properties, including bisphenol A, organochlorines, polybrominated flame retardants, alkylphenols, and phthalates. These compounds have gradually been elucidated as risk factors for many diseases, such as reproductive, neural, and metabolic diseases and cancers. Endocrine disruption has been spread to wildlife and species that are connected to the food chains. Dietary uptake represents an important source of EDC exposure. Although EDCs represent a significant public health concern, the relationship and specific mechanism between EDCs and diseases remain unclear. This review focuses on the disease-EDC relationship and the disease endpoints associated with endocrine disruption for a better understanding of the relationship between EDCs-disease and elucidates the development of new prevention/treatment opportunities and screening methods.
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Affiliation(s)
- Changhwan Ahn
- Laboratory of Veterinary Physiology, College of Veterinary Medicine, Jeju National University, Jeju 63243, Republic of Korea
| | - Eui-Bae Jeung
- Laboratory of Veterinary Biochemistry and Molecular Biology, College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea
- Correspondence: ; Tel.: +82-043-261-2397; Fax: +82-43-267-3150
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Kurşunoğlu NE, Sarer Yurekli BP. Endocrine disruptor chemicals as obesogen and diabetogen: Clinical and mechanistic evidence. World J Clin Cases 2022; 10:11226-11239. [PMID: 36387809 PMCID: PMC9649566 DOI: 10.12998/wjcc.v10.i31.11226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 08/19/2022] [Accepted: 09/27/2022] [Indexed: 02/05/2023] Open
Abstract
Obesity is becoming an inevitable pandemic all over the world. The World Obesity Federation predicts in the 2022 World Obesity Atlas that one billion people worldwide, including 1 in 5 women and 1 in 7 men, will be living with obesity by 2030. Moreover, the prevalence of diabetes is increasing worldwide, and diabetes is becoming more of a public health problem. Increased insulin resistance due to obesity and deficiency in insulin secretion are the two main causes of type 2 diabetes mellitus (T2DM). An exogenous chemical or mixture of chemicals that interferes with any aspect of hormone action was defined as endocrine-disrupting chemicals (EDCs). Bisphenol A (BPA), the first known EDC, was synthesized and was considered to be estrogenic. Global production of BPA has increased progressively from 5 to 8 million tons (MT) between 2010 and 2016. Furthermore, researchers estimated that the production should reach 10.2 MT by 2022. The human population is exposed to EDCs in daily life in such forms as pesticides/herbicides, industrial and household products, plastics, detergents, and personal care products. The term obesogen was used for chemicals that promote weight gain and obesity by increasing the number of adipocytes and fat storage in existing adipocytes, changing the energy balance, and finally regulating appetite and satiety. Besides the obesogenic effect, EDCs can cause T2DM through alteration in ß cell function and morphology and insulin resistance. In this review, we provide clinical and mechanistic evidence regarding EDCs as obesogen and diabetogen. However, those studies are not enough methodologically to indicate causality. In this respect, randomized clinical trials are needed to investigate the association between obesogen, diabetogen and the related metabolic clinical picture.
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Xu Z, Yu S, Mo W, Tang Y, Cheng Y, Ding L, Chen M, Peng S. Facile and Sensitive Method for Detecting Bisphenol A UsingUbiquitous pH Meters. ChemistrySelect 2022. [DOI: 10.1002/slct.202202002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zhou Xu
- Hunan Provincial Key Laboratory of Cytochemistry School of Food Science and Bioengineering Changsha University of Science & Technology Changsha 410114 China
| | - ShaoYi Yu
- Hunan Provincial Key Laboratory of Cytochemistry School of Food Science and Bioengineering Changsha University of Science & Technology Changsha 410114 China
| | - WeiXi Mo
- Hunan Provincial Key Laboratory of Cytochemistry School of Food Science and Bioengineering Changsha University of Science & Technology Changsha 410114 China
| | - Yao Tang
- Hunan Provincial Key Laboratory of Cytochemistry School of Food Science and Bioengineering Changsha University of Science & Technology Changsha 410114 China
| | - Yunhui Cheng
- Hunan Provincial Key Laboratory of Cytochemistry School of Food Science and Bioengineering Changsha University of Science & Technology Changsha 410114 China
- School of Food Science and Engineering Qilu University of Technology, Jinan, Shandong, 250353, China
| | - Li Ding
- Hunan Provincial Key Laboratory of Cytochemistry School of Food Science and Bioengineering Changsha University of Science & Technology Changsha 410114 China
| | - Maolong Chen
- Hunan Provincial Key Laboratory of Cytochemistry School of Food Science and Bioengineering Changsha University of Science & Technology Changsha 410114 China
| | - Shuang Peng
- Hunan Provincial Key Laboratory of Cytochemistry School of Food Science and Bioengineering Changsha University of Science & Technology Changsha 410114 China
- College of Chemistry and Chemical Engineering Hunan University Changsha 410082 Hunan China
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Mu X, Qi S, Wang H, Yuan L, Wang C, Li Y, Qiu J. Bisphenol analogues induced metabolic effects through eliciting intestinal cell heterogeneous response. ENVIRONMENT INTERNATIONAL 2022; 165:107287. [PMID: 35598417 DOI: 10.1016/j.envint.2022.107287] [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: 03/17/2022] [Revised: 04/26/2022] [Accepted: 05/05/2022] [Indexed: 06/15/2023]
Abstract
The metabolic effects of endocrine-disrupting chemicals, such as bisphenol analogues, have drawn increasing attention. Bisphenol A (BPA) usage is associated with the occurrence of many metabolic diseases. With the restricted use of BPA, alternatives like bisphenol F (BPF) and bisphenol AF (BPAF) have been greatly introduced for industrial manufacture, and brings new hazard to public health. To understand how bisphenol analogues induced metabolic effects, zebrafish are continuous exposed to environmental level (0.5 μg/L) of BPA, BPF and BPAF since embryonic stage, and identified hepatic steatosis and insulin resistance at 60-day post fertilization. Hepatic transcriptional profile indicated that pancreatic disease pathways were activated by BPA, but were inhibited by BPF. At the same time, increased lipid secretion and gluconeogenesis pathways in zebrafish liver was found post BPAF exposure. Significant inflammatory response, histological injury and increased mucus secretion was detected in zebrafish intestine post exposure of three bisphenol analogues. Single-cell RNA sequencing of zebrafish intestinal cells revealed activation of lipid uptake and absorption pathways in enterocyte lineages, which well explained the hepatic steatosis induced by BPA and BPF. Besides, genes related to carbohydrate metabolism, diabetes and insulin resistance were activated in intestinal immune cell types by three bisphenol analogues. These findings indicated that BPA and its alternatives could lead to abnormal lipid and carbohydrate metabolism of zebrafish through inducing cell heterogeneous changes in gut, and revealed both molecular and cellular mechanism in mediating this effect.
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Affiliation(s)
- Xiyan Mu
- Institute of Quality Standard and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, People's Republic of China; Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China.
| | - Suzhen Qi
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing, People's Republic of China
| | - Hui Wang
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Lilai Yuan
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Chengju Wang
- College of Sciences, China Agricultural University, Beijing, People's Republic of China
| | - Yingren Li
- Fishery Resource and Environment Research Center, Chinese Academy of Fishery Sciences, Beijing, People's Republic of China
| | - Jing Qiu
- Institute of Quality Standard and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, People's Republic of China.
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Fang R, Yang S, Gu X, Li C, Bi N, Wang HL. Early-life exposure to bisphenol A induces dysregulation of lipid homeostasis by the upregulation of SCD1 in male mice. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 304:119201. [PMID: 35341816 DOI: 10.1016/j.envpol.2022.119201] [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: 12/01/2021] [Revised: 02/12/2022] [Accepted: 03/21/2022] [Indexed: 06/14/2023]
Abstract
Exposure of Bisphenol A (BPA) is closely associated with an increased prevalence of obesity-related metabolic syndrome. However, the potential mechanism of BPA-induced adipogenesis remains to be fully elucidated. Herein, potential mechanisms of BPA-induced adipogenesis in 3T3-L1 preadipocytes were evaluated using RNA-Seq. Then, using an early-life BPA exposure model, we further evaluated the effects of BPA exposure on lipid and glucose homeostasis. The results showed that lipid content in 3T3-L1 adipocytes was significantly increased after BPA exposure (p < 0.01) and male C57BL/6 mice with the dose of 500 μg/kg/day BPA by once-a-day oral administration for 8 weeks displayed a NAFLD-like phenotype. RNA-Seq analysis of preadipocytes showed that BPA exposure affected multiple biological processes including glycosphingolipid biosynthesis, regulation of lipolysis in adipocytes, PPAR signaling pathway and fatty acid metabolism. The dysregulation in a series of genes of mice was associated to de novo lipogenesis and lipid transport, which was linked to obesity. Importantly, we also found a significant expression increase of stearoyl-CoA desaturase 1 (SCD1) and a significant decrease of apolipoprotein D (APOD) in both fat (p < 0.01) and livers (p < 0.01) of male mice. Besides, the dysregulation of pro-inflammatory genes (TNF-α,IL-6 and SAA3) showed that BPA exposure promoted progression of hepatic inflammation. In conclusion, this study elucidated a novel mechanism in which obesity associated with BPA exposure by targeting SCD1. Exposure to BPA should be carefully examined in the chronic liver metabolic diseases.
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Affiliation(s)
- Ruyue Fang
- College of Food and Biological Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei, Anhui, 230009, PR China
| | - Shaohua Yang
- College of Food and Biological Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei, Anhui, 230009, PR China
| | - Xiaozhen Gu
- College of Food and Biological Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei, Anhui, 230009, PR China
| | - Changqing Li
- College of Food and Biological Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei, Anhui, 230009, PR China
| | - Nanxi Bi
- College of Food and Biological Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei, Anhui, 230009, PR China
| | - Hui-Li Wang
- College of Food and Biological Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei, Anhui, 230009, PR China.
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12
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Mina A, Boutzios G, Papoutsis I, Kaparos G, Christopoulos P, Kousta E, Mastrominas M, Athanaselis S, Mastorakos G. Bisphenol A correlates with fewer retrieved oocytes in women with tubal factor infertility. Hormones (Athens) 2022; 21:305-315. [PMID: 35524040 DOI: 10.1007/s42000-022-00370-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 04/12/2022] [Indexed: 11/04/2022]
Abstract
PURPOSE Serum and urinary bisphenol A (BPA) concentrations have been associated negatively with the number of retrieved oocytes after in vitro fertilization (IVF). The impact of BPA upon women with polycystic ovary syndrome (PCOS) and women with tubal factor infertility (TFI), following IVF, was investigated. To this purpose, associations among serum and urinary and follicular fluid (FF) BPA concentrations and the number of retrieved and fertilized oocytes and comparisons between pregnancy rates were evaluated. METHODS This was a cross-sectional study conducted at a university-affiliated assisted conception unit between January and November 2019, including 93 women of reproductive age (PCOS: 45; TFI: 48) following IVF. Unconjugated FF and serum BPA concentrations and total urinary BPA concentration were measured using a novel gas chromatography-mass spectrometry method. The number of retrieved and fertilized oocytes and pregnancy rate were documented and evaluated. RESULTS The number of oocytes retrieved from PCOS women was greater than that of 21 TFI women, independently of BMI. Lower FF BPA concentrations were found in all PCOS women and in overweight/obese PCOS compared to TFI women (0.50, 0.38, and 1.13 ng/mL, respectively). In TFI women, FF BPA concentrations correlated negatively with the number of retrieved oocytes. Serum and FF and urinary BPA concentrations did not significantly affect the number of fertilized oocytes and pregnancy rate in both groups. CONCLUSION FF BPA concentrations were lower in all PCOS women and in overweight/obese PCOS than in TFI women. In TFI women, FF BPA concentrations correlated negatively with retrieved oocytes. Confirmation of these findings might lead to moderation of use of BPA-containing products by women undergoing IVF.
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Affiliation(s)
- Areti Mina
- Endocrine Unit, Medical School, Aretaieion University Hospital, National and Kapodistrian University of Athens, 76 Vas. Sofias Str, PO Box 11528, Athens, Greece
- Department of Forensic Medicine and Toxicology, Medical School, National and Kapodistrian University of Athens, 75 Mikras Asias Str, PO Box 11527, Athens, Greece
| | - Georgios Boutzios
- Endocrine Unit, Department of Pathophysiology, Medical School, Laiko University Hospital, National and Kapodistrian University of Athens, 75 Mikras Asias Str, PO Box 11527, Athens, Greece
| | - Ioannis Papoutsis
- Department of Forensic Medicine and Toxicology, Medical School, National and Kapodistrian University of Athens, 75 Mikras Asias Str, PO Box 11527, Athens, Greece
| | - George Kaparos
- Hormonal and Biochemical Laboratory, Medical School, Aretaieion University Hospital, National and Kapodistrian University of Athens, 76 Vas. Sofias Str, PO Box 11528, Athens, Greece
| | - Panagiotis Christopoulos
- Endocrine Unit, Medical School, Aretaieion University Hospital, National and Kapodistrian University of Athens, 76 Vas. Sofias Str, PO Box 11528, Athens, Greece
| | - Eleni Kousta
- Endocrine Unit, Medical School, Aretaieion University Hospital, National and Kapodistrian University of Athens, 76 Vas. Sofias Str, PO Box 11528, Athens, Greece
| | - Minas Mastrominas
- Embryogenesis Assisted Conception Unit, Kifisias 49 Avenue, PO Box 15123, Athens, Greece
| | - Sotirios Athanaselis
- Department of Forensic Medicine and Toxicology, Medical School, National and Kapodistrian University of Athens, 75 Mikras Asias Str, PO Box 11527, Athens, Greece
| | - George Mastorakos
- Endocrine Unit, Medical School, Aretaieion University Hospital, National and Kapodistrian University of Athens, 76 Vas. Sofias Str, PO Box 11528, Athens, Greece.
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The Role of Persistent Organic Pollutants in Obesity: A Review of Laboratory and Epidemiological Studies. TOXICS 2022; 10:toxics10020065. [PMID: 35202251 PMCID: PMC8877532 DOI: 10.3390/toxics10020065] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/29/2022] [Accepted: 01/30/2022] [Indexed: 11/17/2022]
Abstract
Persistent organic pollutants (POPs) are considered as potential obesogens that may affect adipose tissue development and functioning, thus promoting obesity. However, various POPs may have different mechanisms of action. The objective of the present review is to discuss the key mechanisms linking exposure to POPs to adipose tissue dysfunction and obesity. Laboratory data clearly demonstrate that the mechanisms associated with the interference of exposure to POPs with obesity include: (a) dysregulation of adipogenesis regulators (PPARγ and C/EBPα); (b) affinity and binding to nuclear receptors; (c) epigenetic effects; and/or (d) proinflammatory activity. Although in vivo data are generally corroborative of the in vitro results, studies in living organisms have shown that the impact of POPs on adipogenesis is affected by biological factors such as sex, age, and period of exposure. Epidemiological data demonstrate a significant association between exposure to POPs and obesity and obesity-associated metabolic disturbances (e.g., type 2 diabetes mellitus and metabolic syndrome), although the existing data are considered insufficient. In conclusion, both laboratory and epidemiological data underline the significant role of POPs as environmental obesogens. However, further studies are required to better characterize both the mechanisms and the dose/concentration-response effects of exposure to POPs in the development of obesity and other metabolic diseases.
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An SJ, Yang EJ, Oh S, Park KJ, Kim T, Hong YP, Yang YJ. The association between urinary bisphenol A levels and nonalcoholic fatty liver disease in Korean adults: Korean National Environmental Health Survey (KoNEHS) 2015-2017. Environ Health Prev Med 2021; 26:91. [PMID: 34521354 PMCID: PMC8442282 DOI: 10.1186/s12199-021-01010-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 08/29/2021] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Nonalcoholic fatty liver disease (NAFLD) is becoming a global health problem. Bisphenol A (BPA), one of most widely used environmental chemicals, is suspected to be a contributor to the development NAFLD. This study was performed to examine the relationship between human BPA levels and risk of NAFLD. METHODS The data (n = 3476 adults: 1474 men and 2002 women) used in this study were obtained from the Korean National Environmental Health Survey III (2015-2017). BPA levels were measured in urine samples. NAFLD was defined using hepatic steatosis index after exclusion of other causes of hepatic diseases. RESULTS There was a significant linear relationship between the elevated urinary BPA concentrations and risk of NAFLD. In a univariate analysis, odds ratio (OR) of the highest quartile of urinary BPA level was 1.47 [95% confidence interval (CI) 1.11-1.94] compared to the lowest quartile. After adjusted with covariates, the ORs for NAFLD in the third and fourth quartiles were 1.31 [95% CI 1.03-1.67] and 1.32 [95% CI 1.03-1.70], respectively. CONCLUSIONS Urinary BPA levels are positively associated with the risk of NAFLD in adults. Further experimental studies are needed to understand the molecular mechanisms of BPA on NAFLD prevalence.
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Affiliation(s)
- Sang Joon An
- Department of Neurology, Catholic Kwandong University International St Mary's Hospital, Incheon, 22711, Republic of Korea
| | - Eun-Jung Yang
- Department of Plastic and Reconstructive Surgery, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Subin Oh
- College of Medicine, Catholic Kwandong University, Gangneung-si, Gangwon-do, 25601, Republic of Korea
| | - Kyong Jin Park
- College of Medicine, Catholic Kwandong University, Gangneung-si, Gangwon-do, 25601, Republic of Korea
| | - Taehyen Kim
- College of Medicine, Catholic Kwandong University, Gangneung-si, Gangwon-do, 25601, Republic of Korea
| | - Yeon-Pyo Hong
- Department of Preventive Medicine, College of Medicine, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Yun-Jung Yang
- Institute of Biomedical Science, Catholic Kwandong University International St. Mary's Hospital, Incheon, 22711, Republic of Korea.
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15
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Jones J, Reneau P, Dos Santos JM. Metabolically healthy obese vs. Metabolic syndrome - The crosslink between nutritional exposure to bisphenols and physical exercise. Med Hypotheses 2021; 149:110542. [PMID: 33662862 DOI: 10.1016/j.mehy.2021.110542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Accepted: 02/14/2021] [Indexed: 12/24/2022]
Abstract
Obesity has become a worldwide pandemic as well as a major contributing factor to the increasing rate of type 2 diabetes (T2D). However, there is an intriguing variance demonstrated by a subset of obesity defined as metabolically healthy obesity (MHO). MHO individuals are less prone to develop obesity-related metabolic complications, such as metabolic syndrome (MetS) and further T2D. The exact reason why an MHO person does not present the cluster of risk factors associated with insulin resistance is unknown due to the challenge to mimic MHO in experimental settings. However, MHO individuals present lower sedentary behaviors in comparison to individuals with MetS, which might indicate that an adaptation to skeletal muscle, such as increased insulin sensitivity and glucose transporter (GLUT4), could play a major role in their healthy characteristics. The hypothesis invoked in this paper is that lower exposure to bisphenol together with increased levels of physical exercise underlie the physiological aspects behind MHO characteristics. Evidence suggests that exposure to "obseogens," such as bisphenol A (BPA), appears to impair insulin secretion and insulin response in cells containing GLUT4. Epidemiological studies have associated higher levels of BPA, as well as bisphenol S and F, in children with a risk for MetS development. Therefore, the combination between low bisphenol exposure and increased physical exercise may not necessarily affect body weight, but it could modify several metabolic pathways inhibiting insulin resistance, which characterize the heathy status of the MHO. If confirmed, this hypothesis could lead to therapeutic approaches to reverse MetS and inhibit T2D onset.
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Affiliation(s)
- Jessica Jones
- School of Education Health and Human Performance, Fairmont State University, United States
| | - Paul Reneau
- School of Education Health and Human Performance, Fairmont State University, United States
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16
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Ma Q, Deng P, Lin M, Yang L, Li L, Guo L, Zhang L, He M, Lu Y, Pi H, Zhang Y, Yu Z, Chen C, Zhou Z. Long-term bisphenol A exposure exacerbates diet-induced prediabetes via TLR4-dependent hypothalamic inflammation. JOURNAL OF HAZARDOUS MATERIALS 2021; 402:123926. [PMID: 33254826 DOI: 10.1016/j.jhazmat.2020.123926] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 09/02/2020] [Accepted: 09/03/2020] [Indexed: 06/12/2023]
Abstract
Bisphenol A (BPA), an environmental endocrine-disrupting compound, has been revealed associated with metabolic disorders such as obesity, prediabetes, and type 2 diabetes (T2D). However, its underlying mechanisms are still not fully understood. Here, we provide new evidence that BPA is a risk factor for T2D from a case-control study. To explore the detailed mechanisms, we used two types of diet models, standard diet (SD) and high-fat diet (HFD), to study the effects of long-term BPA exposure on prediabetes in 4-week-old mice. We found that BPA exposure for 12 weeks exacerbated HFD-induced prediabetic symptoms. Female mice showed increased body mass, serum insulin level, and impaired glucose tolerance, while male mice only exhibited impaired glucose tolerance. No change was found in SD-fed mice. Besides, BPA exposure enhanced astrocyte-dependent hypothalamic inflammation in both male and female mice, which impaired proopiomelanocortin (POMC) neuron functions. Moreover, eliminating inflammation by toll-like receptor 4 (TLR4) knockout significantly abolished the effects of BPA on the hypothalamus and diet-induced prediabetes. Taken together, our data establish a key role for TLR4-dependent hypothalamic inflammation in regulating the effects of BPA on prediabetes.
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Affiliation(s)
- Qinlong Ma
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Ping Deng
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Min Lin
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Lingling Yang
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Le Li
- Department of Health Management Center, Southwest Hospital, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Lu Guo
- Department of Neurology, Daping Hospital, Army Medical University (Former Name: Third Military Medical University), Chongqing 400042, People's Republic of China
| | - Lei Zhang
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Mindi He
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Yonghui Lu
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Huifeng Pi
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Yanwen Zhang
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Zhengping Yu
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China
| | - Chunhai Chen
- Department of Occupational Health, Army Medical University (Former Name: Third Military Medical University), Chongqing 400038, People's Republic of China.
| | - Zhou Zhou
- Department of Environmental Medicine, and Department of Emergency Medicine of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, People's Republic of China.
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17
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Hagobian T, Delli-Bovi Z, Mercado A, Bird A, Guy M, Phelan S. Development and feasibility of randomized trial to reduce urinary bisphenols in women with obesity. Pilot Feasibility Stud 2021; 7:24. [PMID: 33436090 PMCID: PMC7802296 DOI: 10.1186/s40814-020-00744-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 12/10/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Bisphenol exposure is widespread and correlated with diabetes and cardiovascular disease. Previous intervention studies have successfully lowered bisphenol exposure among women of normal weight. The primary objective of this study was to develop and test the feasibility of a 3-week behavioral change intervention, rooted in social cognitive theory, to lower a broad range of bisphenols (BPA, BPS, and BPF) in women with obesity. METHODS Thirty women with obesity (31.1 ± 5.6 kg/m2, 21.1 ± 3.1 years) were randomly assigned to an intervention or control. The intervention included weekly face-to-face meetings to reduce bisphenol exposures from food, cosmetics, and packaged products. Fasting urinary bisphenols, creatinine, and weight were assessed at study entry and after 3 weeks. RESULTS The intervention was evaluated as feasible (100% of enrollment and recruitment, 96% of retention and attendance at lesson plan visits, and 96% of a collection of urine samples). Adherence to the intervention was estimated based on completion of self-monitoring records; the number of daily records completed was 7.7 ± 1.3 (mean ± SD) after week 1, 7.1 ± 1.5 after week 2, and 4.4 ± 0.9 after week 3. In secondary analysis, there was a significant treatment × time effect on creatinine-corrected urinary BPS (- 1.42 μg/g creatinine in the intervention vs. - 0.09 μg/g creatinine in the control group). CONCLUSION In women with obesity, the 3-week intervention was considered feasible with promising preliminary results of decreasing BPS concentrations. These data warrant future large-scale clinical trial interventions to reduce bisphenol exposure and determine whether reductions in bisphenols positively impact diabetes and cardiovascular disease risk markers. This study was retroactively registered at ClinicalTrial.gov Identifier NCT03440307.
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Affiliation(s)
- Todd Hagobian
- Center for Health Research and Department of Kinesiology and Public Health, California Polytechnic State University, 1 Grand Avenue, San Luis Obispo, CA, 93407, USA.
| | - Zoe Delli-Bovi
- Center for Health Research and Department of Kinesiology and Public Health, California Polytechnic State University, 1 Grand Avenue, San Luis Obispo, CA, 93407, USA
| | - Adrian Mercado
- Center for Health Research and Department of Kinesiology and Public Health, California Polytechnic State University, 1 Grand Avenue, San Luis Obispo, CA, 93407, USA
| | - Alyssa Bird
- Center for Health Research and Department of Kinesiology and Public Health, California Polytechnic State University, 1 Grand Avenue, San Luis Obispo, CA, 93407, USA
| | - Megan Guy
- Center for Health Research and Department of Kinesiology and Public Health, California Polytechnic State University, 1 Grand Avenue, San Luis Obispo, CA, 93407, USA
| | - Suzanne Phelan
- Center for Health Research and Department of Kinesiology and Public Health, California Polytechnic State University, 1 Grand Avenue, San Luis Obispo, CA, 93407, USA
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Engin AB, Engin A. The effect of environmental Bisphenol A exposure on breast cancer associated with obesity. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2021; 81:103544. [PMID: 33161112 DOI: 10.1016/j.etap.2020.103544] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 10/30/2020] [Accepted: 11/01/2020] [Indexed: 06/11/2023]
Abstract
Bisphenol A (BPA) is a widely used endocrine disrupter. Its environmental exposure is a causative factor of cell aging via decreasing telomerase activity, thus leading to shortening of telomere length. Epidemiological studies confirm positive associations between BPA exposure and the incidence of obesity and type 2 diabetes (T2DM). Increased urinary BPA levels in obese females are both significantly correlated with shorter relative telomere length and T2DM. BPA is a critically effective endocrine disrupter leading to poor prognosis via the obesity-inflammation-aromatase axis in breast cancer. Environmental BPA exposure contributes to the progression of both estrogen dependent and triple negative breast cancers. BPA is a positive regulator of human telomerase reverse transcriptase (hTERT) and it increases the expression of hTERT mRNA in breast cancer cells. BPA exposure can lead to tamoxifen resistance. Among patients treated with chemotherapy, those with persistent high telomerase activity due to BPA are at higher risk of death.
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Affiliation(s)
- Ayse Basak Engin
- Gazi University, Faculty of Pharmacy, Department of Toxicology, Ankara, Turkey.
| | - Atilla Engin
- Gazi University, Faculty of Medicine, Department of General Surgery, Ankara, Turkey
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Zettergren A, Andersson N, Larsson K, Kull I, Melén E, Georgelis A, Berglund M, Lindh C, Bergström A. Exposure to environmental phthalates during preschool age and obesity from childhood to young adulthood. ENVIRONMENTAL RESEARCH 2021; 192:110249. [PMID: 32980305 DOI: 10.1016/j.envres.2020.110249] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 08/28/2020] [Accepted: 09/17/2020] [Indexed: 05/24/2023]
Abstract
Obesity rates are increasing globally, and recent theories suggest that phthalates may contribute to obesity development. This longitudinal study aimed to investigate associations between environmental phthalate exposure during childhood and obesity, utilizing data from 100 participants from a Swedish birth cohort. The participants were followed repeatedly from birth and provided spot urine samples at 4 years. Weight and height were measured at ages 4, 8, 16 and 24 years, as well as additional anthropometric indices at 24 years. Urine samples were analysed for 10 phthalate metabolites using liquid chromatography tandem mass spectrometry. Generalized estimating equation models were performed to assess overall and age-specific associations between urinary phthalate concentrations and BMI groups; thin/normal weight vs overweight/obese. After adjustment for potential confounders, overall associations were observed for diisononyl phthalate (DiNP) metabolites mono(oxo-isononyl) phthalate (MOiNP) (OR per increase ng/ml: 1.18; 95% CI: 1.05, 1.33), mono(carboxy-isooctyl) phthalate (MCiOP) (OR: 1.06; 95% CI: 1.01, 1.11) and ∑DiNP (OR: 1.02; 95% CI:1.00, 1.04) and development of overweight/obesity up to age 24 years. Age-specific associations were observed for the same metabolites at 8, 16 and 24 years. Furthermore, linear regression analysis revealed associations between increased body fat % at age 24 years and MHiNP (β: 2.42; 95% CI: 0.44, 4.39), MOiNP (β: 2.32; 95% CI: 0.46, 4.18), MCiOP (β: 2.65; 95% CI: 0.41, 4.89) and ∑DiNP (β: 2.65; 95% CI: 0.52, 4.77). These findings suggest that DiNP exposure during preschool age may be associated with subsequent obesity, however these findings need to be corroborated by further research.
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Affiliation(s)
- Anna Zettergren
- Institute of Environmental Medicine, Karolinska Institutet, SE 171 77, Stockholm, Sweden.
| | - Niklas Andersson
- Institute of Environmental Medicine, Karolinska Institutet, SE 171 77, Stockholm, Sweden.
| | - Kristin Larsson
- Institute of Environmental Medicine, Karolinska Institutet, SE 171 77, Stockholm, Sweden.
| | - Inger Kull
- Sachs' Children and Youth Hospital, Södersjukhuset, SE 118 61, Stockholm, Sweden; Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, SE 118 83, Stockholm, Sweden.
| | - Erik Melén
- Institute of Environmental Medicine, Karolinska Institutet, SE 171 77, Stockholm, Sweden; Sachs' Children and Youth Hospital, Södersjukhuset, SE 118 61, Stockholm, Sweden; Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, SE 118 83, Stockholm, Sweden.
| | - Antonios Georgelis
- Centre for Occupational and Environmental Medicine, Stockholm County Council, SE 113 65, Stockholm, Sweden.
| | - Marika Berglund
- Institute of Environmental Medicine, Karolinska Institutet, SE 171 77, Stockholm, Sweden.
| | - Christian Lindh
- Division of Occupational and Environmental Medicine, Lund University, SE 223 63, Lund, Sweden.
| | - Anna Bergström
- Institute of Environmental Medicine, Karolinska Institutet, SE 171 77, Stockholm, Sweden; Centre for Occupational and Environmental Medicine, Stockholm County Council, SE 113 65, Stockholm, Sweden.
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Loganathan N, McIlwraith EK, Belsham DD. Bisphenol A Induces Agrp Gene Expression in Hypothalamic Neurons through a Mechanism Involving ATF3. Neuroendocrinology 2021; 111:678-695. [PMID: 32575098 DOI: 10.1159/000509592] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 06/22/2020] [Indexed: 11/19/2022]
Abstract
BACKGROUND Bisphenol A (BPA) is a ubiquitous endocrine disrupting chemical and obesogen. Although limited evidence exists of the effects of BPA on hypothalamic agouti-related peptide (AgRP) levels, the mechanisms underlying these effects remain unknown. Given that AgRP is a potent orexigenic neuropeptide, determining the mechanism by which BPA increases AgRP is critical to preventing the progression to metabolic disease. METHODS Using quantitative reverse transcriptase polymerase chain reaction, we investigated the response of Agrp-expressing mouse hypothalamic cell lines to BPA treatment. The percentage of total BPA entering hypothalamic cells in culture was quantified using an enzyme-linked immunosorbent assay. In order to identify the mechanism underlying BPA-mediated changes in Agrp, siRNA knockdown of transcription factors, FOXO1, CHOP, ATF3, ATF4, ATF6, and small-molecule inhibitors of endoplasmic reticulum stress, JNK or MEK/ERK were used. RESULTS BPA increased mRNA levels of Agrp in six hypothalamic cell lines (mHypoA-59, mHypoE-41, mHypoA-2/12, mHypoE-46, mHypoE-44, and mHypoE-42). Interestingly, only 18% of the total BPA in the culture medium entered the cells after 24 h, suggesting that the exposure concentration is much lower than the treatment concentration. BPA increased pre-Agrp mRNA levels, indicating increased Agrp transcription. Knockdown of the transcription factor ATF3 prevented BPA-mediated increase in Agrp, pre-Agrp, and in part Npy mRNA levels. However, chemical chaperone, sodium phenylbutyrate, JNK inhibitor, SP600125, or the MEK/ERK inhibitor PD0352901 did not block BPA-induced Agrp upregulation. CONCLUSION Overall, these results indicate that hypothalamic Agrp is susceptible to dysregulation by BPA and implicate ATF3 as a common mediator of the orexigenic effects of BPA in hypothalamic neurons.
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Affiliation(s)
- Neruja Loganathan
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | - Emma K McIlwraith
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | - Denise D Belsham
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada,
- Department of Obstetrics and Gynaecology, University of Toronto, Toronto, Ontario, Canada,
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada,
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Mohanto NC, Ito Y, Kato S, Kamijima M. Life-Time Environmental Chemical Exposure and Obesity: Review of Epidemiological Studies Using Human Biomonitoring Methods. Front Endocrinol (Lausanne) 2021; 12:778737. [PMID: 34858347 PMCID: PMC8632231 DOI: 10.3389/fendo.2021.778737] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 10/23/2021] [Indexed: 12/22/2022] Open
Abstract
The exponential global increase in the incidence of obesity may be partly attributable to environmental chemical (EC) exposure. Humans are constantly exposed to ECs, primarily through environmental components. This review compiled human epidemiological study findings of associations between blood and/or urinary exposure levels of ECs and anthropometric overweight and obesity indices. The findings reveal research gaps that should be addressed. We searched MEDLINE (PubMed) for full text English articles published in 2006-2020 using the keywords "environmental exposure" and "obesity". A total of 821 articles were retrieved; 102 reported relationships between environmental exposure and obesity indices. ECs were the predominantly studied environmental exposure compounds. The ECs were grouped into phenols, phthalates, and persistent organic pollutants (POPs) to evaluate obesogenic roles. In total, 106 articles meeting the inclusion criteria were summarized after an additional search by each group of EC combined with obesity in the PubMed and Scopus databases. Dose-dependent positive associations between bisphenol A (BPA) and various obesity indices were revealed. Both individual and summed di(2-ethylhexyl) phthalate (DEHP) and non-DEHP metabolites showed inconsistent associations with overweight and obesity indices, although mono-butyl phthalate (MBP), mono-ethyl phthalate (MEP), and mono-benzyl phthalate (MBzP) seem to have obesogenic roles in adolescents, adults, and the elderly. Maternal exposure levels of individual POP metabolites or congeners showed inconsistent associations, whereas dichlorodiphenyldichloroethylene (DDE) and perfluorooctanoic acid (PFOA) were positively associated with obesity indices. There was insufficient evidence of associations between early childhood EC exposure and the subsequent development of overweight and obesity in late childhood. Overall, human evidence explicitly reveals the consistent obesogenic roles of BPA, DDE, and PFOA, but inconsistent roles of phthalate metabolites and other POPs. Further prospective studies may yield deeper insights into the overall scenario.
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Loganathan N, McIlwraith EK, Belsham DD. BPA Differentially Regulates NPY Expression in Hypothalamic Neurons Through a Mechanism Involving Oxidative Stress. Endocrinology 2020; 161:5910085. [PMID: 32960947 DOI: 10.1210/endocr/bqaa170] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 09/18/2020] [Indexed: 12/13/2022]
Abstract
Bisphenol A (BPA), a ubiquitous endocrine-disrupting chemical, interferes with reproduction and is also considered an obesogen. The neuropeptide Y (NPY) neurons of the hypothalamus control both food intake and reproduction and have emerged as potential targets of BPA. These functionally diverse subpopulations of NPY neurons are differentially regulated by peripheral signals, such as estrogen and leptin. Whether BPA also differentially alters Npy expression in subpopulations of NPY neurons, contributing to BPA-induced endocrine dysfunction is unclear. We investigated the response of 6 immortalized hypothalamic NPY-expressing cell lines to BPA treatment. BPA upregulated Npy mRNA expression in 4 cell lines (mHypoA-59, mHypoE-41, mHypoA-2/12, mHypoE-42), and downregulated Npy in 2 lines (mHypoE-46, mHypoE-44). This differential expression of Npy occurred concurrently with differential expression of estrogen receptor mRNA levels. Inhibition of G-protein coupled estrogen receptor GPR30 or estrogen receptor β prevented the BPA-mediated decrease in Npy, whereas inhibition of energy sensor 5' adenosine monophosphate-activated protein kinase (AMPK) with compound C prevented BPA-induced increase in Npy. BPA also altered neuroinflammatory and oxidative stress markers in both mHypoA-59 and mHypoE-46 cell lines despite the differential regulation of Npy. Remarkably, treatment with BPA in an antioxidant-rich media, Neurobasal A (NBA), or with reactive oxygen species scavenger tauroursodeoxycholic acid mitigated the BPA-induced increase and decrease in Npy. Furthermore, 2 antioxidant species from NBA-N-acetylcysteine and vitamin B6-diminished the induction of Npy in the mHypoA-59 cells, demonstrating these supplements can counteract BPA-induced dysregulation in certain subpopulations. Overall, these results illustrate the differential regulation of Npy by BPA in neuronal subpopulations, and point to oxidative stress as a pathway that can be targeted to block BPA-induced Npy dysregulation in hypothalamic neurons.
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Affiliation(s)
- Neruja Loganathan
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | - Emma K McIlwraith
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | - Denise D Belsham
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
- Department of Obstetrics, University of Toronto, Toronto, Ontario, Canada
- Department of Gynaecology and Medicine, University of Toronto, Toronto, Ontario, Canada
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Feng D, Zhang H, Jiang X, Zou J, Li Q, Mai H, Su D, Ling W, Feng X. Bisphenol A exposure induces gut microbiota dysbiosis and consequent activation of gut-liver axis leading to hepatic steatosis in CD-1 mice. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 265:114880. [PMID: 32540565 DOI: 10.1016/j.envpol.2020.114880] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 05/22/2020] [Accepted: 05/25/2020] [Indexed: 05/26/2023]
Abstract
Interactions between the intestine and the liver, the so-called 'gut-liver axis', play a crucial role in the onset of hepatic steatosis and non-alcoholic fatty liver disease. However, not much is known about the impact of environmental pollutants on the gut-liver axis and consequent hepatic steatosis. Bisphenol A (BPA), a widely used plasticiser, is an important environmental contaminant that affects gut microbiota. We hypothesised that BPA induces hepatic steatosis by promoting gut microbiota dysbiosis and activating the gut-liver axis. In this study, male CD-1 mice were fed with diet containing BPA (50 μg/kg body weight/day) for 24 weeks. Dietary exposure to BPA increased lipid contents and fat accumulation in the liver. Analysis of 16 S rRNA gene sequencing revealed that the diversity of gut microbiota reduced and the composition of gut microbiota was altered in the BPA-fed mice. Further, the abundance of Proteobacteria, a marker of dysbacteria, increased, whereas the abundance of Akkermansia, a gut microbe associated with increased gut barrier function and reduced inflammation, markedly decreased. Expression levels of intestinal tight junction proteins (zona occludens-1 and occludin) also decreased drastically, leading to increased intestinal permeability and elevated levels of endotoxins. Furthermore, BPA up-regulated the expression of Toll-like receptor 4 (TLR4) and phosphorylation of nuclear factor-kappa B (NF-κB) in the liver and increased the production of inflammatory cytokines, including interleukin-1β, interleukin-18, tumour necrosis factor-α, and interleukin-6. Take together, our work indicated that dietary intake of BPA induced hepatic steatosis, and this was closely related to dysbiosis of gut microbiota, elevated endotoxin levels, and increased liver inflammation through the TLR4/NF-κB pathway.
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Affiliation(s)
- Dan Feng
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-sen University, 510080, China; Guangzhou Key Laboratory of Environmental Pollution and Health Risk Assessment, School of Public Health, Sun Yat-sen University, 510080, China
| | - Hongmin Zhang
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-sen University, 510080, China
| | - Xin Jiang
- Guangzhou Key Laboratory of Environmental Pollution and Health Risk Assessment, School of Public Health, Sun Yat-sen University, 510080, China
| | - Jun Zou
- Department of Cardiology, Affiliated Nanhai Hospital of Southern Medical University, 528200, China
| | - Qingrong Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-sen University, 510080, China
| | - Haiyan Mai
- Department of Clinic Nutrition, The First Affiliated Hospital, Sun Yat-sen University, 510080, China
| | - Dongfang Su
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, 510060, China
| | - Wenhua Ling
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-sen University, 510080, China
| | - Xiang Feng
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-sen University, 510080, China.
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Lim JE, Choi B, Jee SH. Urinary bisphenol A, phthalate metabolites, and obesity: do gender and menopausal status matter? ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:34300-34310. [PMID: 32557043 DOI: 10.1007/s11356-020-09570-x] [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] [Received: 12/22/2019] [Accepted: 06/01/2020] [Indexed: 06/11/2023]
Abstract
Previous studies of urinary bisphenol A (BPA), phthalate metabolites, and obesity risk have shown inconsistent results. Menopausal status is one of the main factors that affect hormone secretion change in women. In this study, we examined whether urinary BPA and phthalate metabolite levels are associated with obesity and whether the associations differ by sex and menopausal status in a sample of Korean adult populations. We recruited participants at three branches (Yeouido, Gangnam, and Gwanghwamun) of the Korea Medical Institute, a nationwide health check-up center, from 2015 to 2016. Urinary BPA level was measured by high-performance liquid chromatography-tandem mass spectrometry (Agilent 6490 Triple Quad LC-MS/MS; Agilent Technologies, CA, USA). Urinary six phthalate metabolites were analyzed with ultra-high-performance liquid chromatography-tandem mass spectrometry (TSQ Quantum Access Mass; Thermo Fisher Scientific, MA, USA). Participants with body mass index ≥ 25 kg/m2 were defined as general obesity group. Men with waist circumference (WC) ≥ 90 cm and women with WC ≥ 85 cm were defined as abdominal obesity group. Age, sex, alcohol intake, smoking, and exercise were considered in multivariate logistic regression models. Among the total of 702 participants, 211 participants were classified into the general obesity group, and 131 participants were classified into the abdominal obesity group. Urinary phthalate metabolite levels were not associated with general and abdominal obesity in men and women. However, in women, urinary BPA concentration was positively associated with abdominal obesity (OR = 1.50, 95% CI 1.00-2.26). Also, the association was stronger in postmenopausal women (OR = 2.23, 1.01-4.92), while it was weak in premenopausal women (OR = 1.31, 0.78-2.20). In this study, urinary BPA concentration was associated with abdominal obesity in women, especially postmenopausal women. Future studies should consider sex and menopausal status when investigating associations between urinary BPA, phthalate metabolites levels, and obesity.
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Affiliation(s)
- Jung-Eun Lim
- Institute for Health Promotion & Department of Epidemiology and Health Promotion, Graduate School of Public Health, Yonsei University, Seoul, Republic of Korea
- Center for Occupational and Environmental Health, Department of Medicine, University of California, Irvine, CA, USA
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - BongKyoo Choi
- Center for Occupational and Environmental Health, Department of Medicine, University of California, Irvine, CA, USA
- Center for Work and Health Research, Irvine, CA, USA
| | - Sun Ha Jee
- Institute for Health Promotion & Department of Epidemiology and Health Promotion, Graduate School of Public Health, Yonsei University, Seoul, Republic of Korea.
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Fu X, Xu J, Zhang R, Yu J. The association between environmental endocrine disruptors and cardiovascular diseases: A systematic review and meta-analysis. ENVIRONMENTAL RESEARCH 2020; 187:109464. [PMID: 32438096 DOI: 10.1016/j.envres.2020.109464] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 03/15/2020] [Accepted: 03/29/2020] [Indexed: 05/12/2023]
Abstract
BACKGROUND Except for known cardiovascular risk factors, long-term exposure to environmental endocrine disruptors (EEDs) - a class of exogenous chemicals, or a mixture of chemicals, that can interfere with any aspect of hormone action - has been shown to increase the risk of cardiovascular diseases (CVDs), which are still controversial. OBJECTIVE To conduct a comprehensive systematic review and meta-analysis to estimate the association between EEDs, including nonylphenol (NP), bisphenol A (BPA), polychlorinated biphenyl (PCB), organo-chlorine pesticide (OCP) and phthalate (PAE) exposure and CVD risk. METHODS The heterogeneity between different studies was qualitatively and quantitatively evaluated using Q test and I2 statistical magnitude, respectively. Subgroup analysis was performed using chemical homologs - a previously unused grouping method - to extract data and perform meta-analysis to assess their exposure to CVD. RESULTS Twenty-nine literatures were enrolled with a total sample size of 88891. The results indicated that exposure to PCB138 and PCB153 were the risk factors for CVD morbidity (odds ratio (OR) = 1.35, 95% confidence interval (CI): 1.10-1.66; OR = 1.35, 95% CI: 1.13-1.62). Exposure to organo-chlorine pesticide (OCP) (OR = 1.12, 95% CI: 1.00-1.24), as well as with phthalate (PAE) (OR = 1.11, 95% CI: 1.06-1.17) and BPA (OR = 1.19, 95% CI: 1.03-1.37) were positively associated with CVD risk, respectively. BPA exposure concentration had no correlation with total cholesterol (TC), or low-density lipoprotein (LDL), but exhibited a correlation with gender, waist circumference (WC), high-density lipoprotein (HDL), age, and body mass index (BMI) (standardized mean difference (SMD)) = 1.51; 95% CI: =(1.01-2.25); SMD = 0.16; 95% CI: (0.08-0.23); SMD = -0.19; 95% CI: (-0.27-0.12); SMD = -0.78; 95% CI: (-1.42-0.14); SMD = 0.08; 95% CI: (0.00-0.16). CONCLUSIONS EED exposure is a risk factor for CVD. Long-term exposure to EEDs can influence cardiovascular health in humans. A possible synergistic effect may exist between the homologs. The mechanism of which needs to be further explored and demonstrated by additional prospective cohort studies, results of in vitro and in vivo analyses, as well as indices affecting CVD.
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Affiliation(s)
- Xiangjun Fu
- School of Public Health, Zunyi Medical University, Zunyi, Guizhou, 563000, PR China
| | - Jie Xu
- School of Public Health, Zunyi Medical University, Zunyi, Guizhou, 563000, PR China.
| | - Renyi Zhang
- Department of Cardiology, Affiliated Hospital of Zunyi Medical University, Guizhou, PR China
| | - Jie Yu
- School of Public Health, Zunyi Medical University, Zunyi, Guizhou, 563000, PR China.
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Ribeiro CM, Beserra BTS, Silva NG, Lima CL, Rocha PRS, Coelho MS, Neves FDAR, Amato AA. Exposure to endocrine-disrupting chemicals and anthropometric measures of obesity: a systematic review and meta-analysis. BMJ Open 2020; 10:e033509. [PMID: 32565448 PMCID: PMC7311014 DOI: 10.1136/bmjopen-2019-033509] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVE Endocrine-disrupting chemicals (EDCs) are viewed as a major potential link between the environment and obesity development. We did a systematic review and meta-analysis to examine the association between exposure to EDCs and obesity. DATA SOURCES, DESIGN AND ELIGIBILITY CRITERIA PubMed, Scopus and Web of Science were searched from inception to 6 June 2018 for studies primarily addressing the association between exposure to EDCs after the age of 2 years and anthropometric measures of obesity or body fat. The Newcastle-Ottawa scale was used to assess the risk of bias. DATA EXTRACTION AND SYNTHESIS Two independent reviewers screened and conducted data extraction and synthesis. A third reviewer resolved disagreements. RESULTS A total of 73 studies investigating bisphenol A (32 286 individuals), organochlorine compounds (34 567 individuals), phthalates (21 401 individuals), polybrominated biphenyls (2937 individuals), polycyclic aromatic hydrocarbons (5174 individuals), parabens (4097 individuals), benzoic acid (3671 individuals) and polyfluoroalkyl substances (349 individuals) met our inclusion criteria. Most had a cross-sectional design and low or medium risk of bias. In qualitative analysis, bisphenol A and phthalates were consistently associated with general and abdominal obesity, in children and adults, and some studies suggested this association was age-dependent and gender-dependent. Meta-analysis indicated a significant association between exposure to bisphenol A and overweight (OR 1.254, 95% CI 1.005 to 1.564), obesity (OR 1.503, 95% CI 1.273 to 1.774) and increased waist circumference (OR 1.503, 95% CI 1.267 to 1.783) in adults, and between exposure to 2,5-dichlorophenol and obesity in children (OR 1.8, 95% CI 1.1018 to 3.184). CONCLUSION Most observational studies supported a positive association between obesity and exposure to EDCs. Although causality cannot be determined from these data, they underscore the need to limit human exposure to EDCs in light of the evidence from animal and cell-based studies indicating the effects of these chemicals on adiposity. PROSPERO REGISTRATION NUMBER CRD42018074548.
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Affiliation(s)
- Carolina Martins Ribeiro
- Laboratory of Molecular Pharmacology, Department of Pharmaceutical Sciences, University of Brasilia, Brasilia, Brazil
| | - Bruna Teles Soares Beserra
- Laboratory of Molecular Pharmacology, Department of Pharmaceutical Sciences, University of Brasilia, Brasilia, Brazil
| | - Nadyellem Graciano Silva
- Laboratory of Molecular Pharmacology, Department of Pharmaceutical Sciences, University of Brasilia, Brasilia, Brazil
| | - Caroline Lourenço Lima
- Laboratory of Molecular Pharmacology, Department of Pharmaceutical Sciences, University of Brasilia, Brasilia, Brazil
| | - Priscilla Roberta Silva Rocha
- Laboratory of Molecular Pharmacology, Department of Pharmaceutical Sciences, University of Brasilia, Brasilia, Brazil
| | - Michella Soares Coelho
- Laboratory of Molecular Pharmacology, Department of Pharmaceutical Sciences, University of Brasilia, Brasilia, Brazil
| | | | - Angélica Amorim Amato
- Laboratory of Molecular Pharmacology, Department of Pharmaceutical Sciences, University of Brasilia, Brasilia, Brazil
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Rolfo A, Nuzzo AM, De Amicis R, Moretti L, Bertoli S, Leone A. Fetal-Maternal Exposure to Endocrine Disruptors: Correlation with Diet Intake and Pregnancy Outcomes. Nutrients 2020; 12:E1744. [PMID: 32545151 PMCID: PMC7353272 DOI: 10.3390/nu12061744] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 05/25/2020] [Accepted: 06/07/2020] [Indexed: 02/06/2023] Open
Abstract
Endocrine-disrupting chemicals (EDCs) are exogenous substances able to mimic or to interfere with the endocrine system, thus altering key biological processes such as organ development, reproduction, immunity, metabolism and behavior. High concentrations of EDCs are found in several everyday products including plastic bottles and food containers and they could be easily absorbed by dietary intake. In recent years, considerable interest has been raised regarding the biological effects of EDCs, particularly Bisphenol A (BPA) and phthalates, on human pregnancy and fetal development. Several evidence obtained on in vitro and animal models as well as by epidemiologic and population studies strongly indicated that endocrine disruptors could negatively impact fetal and placental health by interfering with the embryonic developing epigenome, thus establishing disease paths into adulthood. Moreover, EDCs could cause and/or contribute to the onset of severe gestational conditions as Preeclampsia (PE), Fetal Growth Restriction (FGR) and gestational diabetes in pregnancy, as well as obesity, diabetes and cardiovascular complications in reproductive age. Therefore, despite contrasting data being present in the literature, endocrine disruptors must be considered as a therapeutic target. Future actions aimed at reducing or eliminating EDC exposure during the perinatal period are mandatory to guarantee pregnancy success and preserve fetal and adult health.
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Affiliation(s)
- Alessandro Rolfo
- Department of Surgical Sciences, University of Turin, Via Ventimiglia 3, 10126 Turin, Italy; (A.M.N.); (L.M.)
| | - Anna Maria Nuzzo
- Department of Surgical Sciences, University of Turin, Via Ventimiglia 3, 10126 Turin, Italy; (A.M.N.); (L.M.)
| | - Ramona De Amicis
- International Center for the Assessment of Nutritional Status (ICANS), Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Via Sandro Botticelli 21, 20133 Milan, Italy; (R.D.A.); (S.B.); (A.L.)
| | - Laura Moretti
- Department of Surgical Sciences, University of Turin, Via Ventimiglia 3, 10126 Turin, Italy; (A.M.N.); (L.M.)
| | - Simona Bertoli
- International Center for the Assessment of Nutritional Status (ICANS), Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Via Sandro Botticelli 21, 20133 Milan, Italy; (R.D.A.); (S.B.); (A.L.)
- Istituto Auxologico Italiano, IRCCS, Lab of Nutrition and Obesity Research, 20145 Milan, Italy
| | - Alessandro Leone
- International Center for the Assessment of Nutritional Status (ICANS), Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Via Sandro Botticelli 21, 20133 Milan, Italy; (R.D.A.); (S.B.); (A.L.)
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Yao YC, Du YY, Wang YX, Deng TR, Liu C, Teng XM, Hua X, Yuan XQ, Guo N, Yin L, Zeng Q, Li YF. Predictors of phthalate metabolites in urine and follicular fluid and correlations between urine and follicular fluid phthalate metabolite concentrations among women undergoing in vitro fertilization. ENVIRONMENTAL RESEARCH 2020; 184:109295. [PMID: 32126376 DOI: 10.1016/j.envres.2020.109295] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 02/22/2020] [Accepted: 02/22/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND Phthalate metabolites in follicular fluid (FF) may negatively affect normal folliculogenesis; however, the predictors of phthalate metabolite concentrations in urine and FF and relationships between urine and FF phthalate metabolite concentrations among women undergoing in vitro fertilization (IVF) are poorly understood. OBJECTIVE To investigate predictors of phthalate metabolites in urine and FF and correlations between urine and FF phthalate metabolite concentrations among women undergoing IVF. METHOD We recruited 305 women seeking infertility treatment at a reproductive center in Wuhan, China, from October to November 2016. Information regarding demographic characteristics, personal care product use and plastic material contact was obtained through direct interviews. Concentrations of 8 phthalate metabolites in urine and FF samples were measured using high-performance liquid chromatography and tandem mass spectrometry. Associations regarding metabolite concentrations in urine and FF samples were analysed by Spearman's correlation and linear regression. Generalized linear regression was used to examine potential predictors of phthalate metabolite concentrations in urine and FF. RESULTS Weak to moderate associations between urine and FF samples were found for monoethyl phthalate (MEP) and mono(2-ethyl-5-oxohexyl) phthalate (MEOHP) (correlation coefficient: MEP, 0.350; MEOHP, 0.377); no associations were observed for other metabolites. The predictive powers of urinary metabolite concentrations in determining FF metabolite concentrations were uniformly low, with R2 ≤ 0.113. Body mass index (BMI) and educational level were inversely associated with the urinary concentrations of certain metabolites. Higher household income, intake of bottled drinks within 48 h, and use of shower gel and soap were frequently associated with higher urinary metabolite concentrations. BMI, higher household income and use of disposable plastic cups within 48 h were associated with higher metabolite concentrations in FF. CONCLUSION Phthalate metabolite concentrations in urine and FF vary according to sociodemographic characteristics and lifestyle factors. Phthalate metabolite concentrations in urine may not be appropriate for estimating ovary phthalate exposure.
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Affiliation(s)
- Yang-Cheng Yao
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Yao-Yao Du
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Yi-Xing Wang
- Department of Nutrition and Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Tao-Ran Deng
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Chong Liu
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Xue-Mei Teng
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Xiang Hua
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Xiao-Qiong Yuan
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Na Guo
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Li Yin
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Qiang Zeng
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China; Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Yu-Feng Li
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China.
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Metabolically Healthy Obesity-Heterogeneity in Definitions and Unconventional Factors. Metabolites 2020; 10:metabo10020048. [PMID: 32012784 PMCID: PMC7074352 DOI: 10.3390/metabo10020048] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 01/21/2020] [Accepted: 01/22/2020] [Indexed: 02/06/2023] Open
Abstract
The concept of heterogeneity among obese individuals in their risk for developing metabolic dysfunction and associated complications has been recognized for decades. At the origin of the heterogeneity idea is the acknowledgement that individuals with central obesity are more prone to developing type 2 diabetes and cardiovascular disease than those with peripheral obesity. There have been attempts to categorize subjects according to their metabolic health and degree of obesity giving rise to different obese and non-obese phenotypes that include metabolically unhealthy normal-weight (MUHNW), metabolically healthy obese (MHO), and metabolically unhealthy obese (MUO). Individuals belonging to the MHO phenotype are obese according to their body mass index although exhibiting fewer or none metabolic anomalies such as type 2 diabetes, dyslipidemia, hypertension, and/or unfavorable inflammatory and fribinolytic profiles. However, some authors claim that MHO is only transient in nature. Additionally, the phenotype categorization is controversial as it lacks standardized definitions possibly blurring the distinction between obesity phenotypes and confounding the associations with health outcomes. To add to the discussion, the factors underlying the origin or protection from metabolic deterioration and cardiometabolic risk for these subclasses are being intensely investigated and several hypotheses have been put forward. In the present review, we compare the different definitions of obesity phenotypes and present several possible factors underlying them (adipose tissue distribution and cellularity, contaminant accumulation on the adipose tissue, dysbiosis and metabolic endotoxemia imposing on to the endocannabinoid tone and inflammasome, and nutrient intake and dietary patterns) having inflammatory activation at the center.
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Li R, Yang S, Gao R, Deng Y, Liu J, Yuan C, Yao Q, Lv X, Wang K, Ye X, Peng B, Hu J, Chen A. RELATIONSHIP BETWEEN THE ENVIRONMENTAL ENDOCRINE DISRUPTOR BISPHENOL A AND DYSLIPIDEMIA: A FIVE-YEAR PROSPECTIVE STUDY. Endocr Pract 2020; 26:399-406. [PMID: 31968191 DOI: 10.4158/ep-2019-0384] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objective: To investigate whether serum bisphenol A (BPA) concentration is related to the occurrence of dyslipidemia. Methods: A total of 574 adults were enrolled at baseline and followed up for 5 years. Concentrations of serum BPA, triglycerides (TGs), low-density lipoprotein (LDL) cholesterol, and high-density lipoprotein (HDL) cholesterol were measured. Dyslipidemia was defined as the existence of one or more of the following conditions: high-LDL-cholesterolemia (LDL ≥140 mg/dL), hypertriglyceridemia (TGs ≥150 mg/dL), or low-HDL-cholesterolemia (HDL <40 mg/dL). Participants were stratified into tertiles according to low, median, and high baseline serum BPA levels. Multivariable linear and logistic regression models were used. Data from baseline and follow-up were used for cross-sectional and longitudinal analyses, respectively. Results: In the cross-sectional analysis, compared to subjects in the low BPA tertile, those in the high BPA tertile showed a higher level of LDL cholesterol (108.1 ± 24.4 mg/dL versus 119.5 ± 26.9 mg/dL; P<.05) and a lower level of HDL cholesterol (46.2 ± 11.7 mg/dL versus 39.5 ± 7.5 mg/dL; P<.05). In multivariable linear regression models, Z-transformed BPA was positively associated with LDL cholesterol (β= 0.13, P = .002) and negatively associated with HDL cholesterol (β= -0.28; P<.001). After cross-sectionally adjusting for confounders, subjects in higher BPA exposure was associated with a higher prevalence of low-HDL-cholesterolemia. Longitudinally, in subjects without low-HDL-cholesterolemia at baseline, each SD increment in baseline BPA was associated with a higher incidence of low-HDL-cholesterolemia after adjustment for confounders (odds ratio [95% confidence interval; CI] 2.76, 95% CI 1.21, 6.29). Conclusion: Cross-sectionally, higher BPA exposure is associated with a higher prevalence of low-HDL-cholesterolemia. Longitudinally, baseline BPA is an independent predictor of the 5-year incidence of low-HDL-cholesterolemia. Abbreviations: BMI = body mass index; BPA = bisphenol A; CI = confidence interval; CVD = cardiovascular disease; EIMDS = environment, inflammation and metabolic diseases study; HDL = high density lipoprotein; LDL = low density lipoprotein; OR = odds ratio; PPAR = peroxisome proliferator-activated receptor; SBP = systolic blood pressure; TG = triglyceride; Z-BPA = Z-transformed bisphenol A.
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Hall JM, Greco CW. Perturbation of Nuclear Hormone Receptors by Endocrine Disrupting Chemicals: Mechanisms and Pathological Consequences of Exposure. Cells 2019; 9:cells9010013. [PMID: 31861598 PMCID: PMC7016921 DOI: 10.3390/cells9010013] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/13/2019] [Accepted: 12/17/2019] [Indexed: 01/09/2023] Open
Abstract
Much of the early work on Nuclear Hormone Receptors (NHRs) focused on their essential roles as mediators of sex steroid hormone signaling in reproductive development and function, and thyroid hormone-dependent formation of the central nervous system. However, as NHRs display tissue-specific distributions and activities, it is not surprising that they are involved and vital in numerous aspects of human development and essential for homeostasis of all organ systems. Much attention has recently been focused on the role of NHRs in energy balance, metabolism, and lipid homeostasis. Dysregulation of NHR function has been implicated in numerous pathologies including cancers, metabolic obesity and syndrome, Type II diabetes mellitus, cardiovascular disease, hyperlipidemia, male and female infertility and other reproductive disorders. This review will discuss the dysregulation of NHR function by environmental endocrine disrupting chemicals (EDCs), and the associated pathological consequences of exposure in numerous tissues and organ systems, as revealed by experimental, clinical, and epidemiological studies.
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Radke EG, Galizia A, Thayer KA, Cooper GS. Phthalate exposure and metabolic effects: a systematic review of the human epidemiological evidence. ENVIRONMENT INTERNATIONAL 2019; 132:104768. [PMID: 31196577 PMCID: PMC9472300 DOI: 10.1016/j.envint.2019.04.040] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 04/15/2019] [Accepted: 04/17/2019] [Indexed: 05/15/2023]
Abstract
OBJECTIVE We performed a systematic review of the epidemiology literature to identify the metabolic effects associated with phthalate exposure. DATA SOURCES AND STUDY ELIGIBILITY CRITERIA Six phthalates were included in the review: di(2‑ethylhexyl) phthalate (DEHP), diisononyl phthalate (DINP), dibutyl phthalate (DBP), diisobutyl phthalate (DIBP), butyl benzyl phthalate (BBP), and diethyl phthalate (DEP). The initial literature search (of PubMed, Web of Science, and Toxline) included all studies of metabolic effects in humans, and outcomes were selected for full systematic review based on data availability. STUDY EVALUATION AND SYNTHESIS METHODS Studies of diabetes and insulin resistance were evaluated using criteria defined a priori for risk of bias and sensitivity by two reviewers using a domain-based approach; studies identified with a pre-defined critical deficiency were excluded. Evidence was synthesized by outcome and phthalate and strength of evidence was summarized using a structured framework. Studies of obesity and renal effects received "screening level" reviews to determine whether full systematic review was warranted. RESULTS The primary outcomes reviewed here are (number of included/excluded studies in parentheses): type 2 diabetes (1/3), insulin resistance (13/3), and impaired glucose tolerance and blood glucose in pregnancy (4/2). For DEHP exposure, there was consistency among studies of insulin resistance and coherence with the single included study of diabetes, as well as an observed exposure-response gradient observed in a study of insulin resistance. This evidence is considered moderate. Similarly, for DBP and DIBP exposure, the evidence is considered moderate due to strong positive associations in the diabetes study and coherent results for insulin resistance. For DINP, BBP, and DEP, the evidence is considered slight. No association was reported in the single study of diabetes with BBP and DEP exposure (DINP was not investigated). The available evidence does indicate an association between exposure to these phthalates and insulin resistance, but the small number of studies and the lack of coherence with diabetes decreases confidence. The screening level reviews for obesity and renal effects determined that the currently available evidence is inadequate to assess the associations between these outcomes and phthalate exposure. CONCLUSIONS AND IMPLICATIONS OF KEY FINDINGS Overall, these results support that phthalate exposure at levels seen in human populations may have metabolic effects. Given the mechanistic support, the large effect sizes for incident diabetes in the single available study, and the coherence with insulin resistance, the association between phthalate exposure and diabetes risk should be considered when assessing the risks and costs of exposure to specific phthalates in humans. The views expressed are those of the authors and do not necessarily represent the views or policies of the U.S. EPA.
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Li Q, Zhang H, Zou J, Mai H, Su D, Feng X, Feng D. Bisphenol A exposure induces cholesterol synthesis and hepatic steatosis in C57BL/6 mice by down-regulating the DNA methylation levels of SREBP-2. Food Chem Toxicol 2019; 133:110786. [DOI: 10.1016/j.fct.2019.110786] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 08/20/2019] [Accepted: 08/22/2019] [Indexed: 12/12/2022]
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Martinez-Pinna J, Marroqui L, Hmadcha A, Lopez-Beas J, Soriano S, Villar-Pazos S, Alonso-Magdalena P, Dos Santos RS, Quesada I, Martin F, Soria B, Gustafsson JÅ, Nadal A. Oestrogen receptor β mediates the actions of bisphenol-A on ion channel expression in mouse pancreatic beta cells. Diabetologia 2019; 62:1667-1680. [PMID: 31250031 DOI: 10.1007/s00125-019-4925-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 04/26/2019] [Indexed: 10/26/2022]
Abstract
AIMS/HYPOTHESIS Bisphenol-A (BPA) is a widespread endocrine-disrupting chemical that has been associated with type 2 diabetes development. Low doses of BPA modify pancreatic beta cell function and induce insulin resistance; some of these effects are mediated via activation of oestrogen receptors α (ERα) and β (ERβ). Here we investigated whether low doses of BPA regulate the expression and function of ion channel subunits involved in beta cell function. METHODS Microarray gene profiling of isolated islets from vehicle- and BPA-treated (100 μg/kg per day for 4 days) mice was performed using Affymetrix GeneChip Mouse Genome 430.2 Array. Expression level analysis was performed using the normalisation method based on the processing algorithm 'robust multi-array average'. Whole islets or dispersed islets from C57BL/6J or oestrogen receptor β (ERβ) knockout (Erβ-/-) mice were treated with vehicle or BPA (1 nmol/l) for 48 h. Whole-cell patch-clamp recordings were used to measure Na+ and K+ currents. mRNA expression was evaluated by quantitative real-time PCR. RESULTS Microarray analysis showed that BPA modulated the expression of 1440 probe sets (1192 upregulated and 248 downregulated genes). Of these, more than 50 genes, including Scn9a, Kcnb2, Kcnma1 and Kcnip1, encoded important Na+ and K+ channel subunits. These findings were confirmed by quantitative RT-PCR in islets from C57BL/6J BPA-treated mice or whole islets treated ex vivo. Electrophysiological measurements showed a decrease in both Na+ and K+ currents in BPA-treated islets. The pharmacological profile indicated that BPA reduced currents mediated by voltage-activated K+ channels (Kv2.1/2.2 channels) and large-conductance Ca2+-activated K+ channels (KCa1.1 channels), which agrees with BPA's effects on gene expression. Beta cells from ERβ-/- mice did not present BPA-induced changes, suggesting that ERβ mediates BPA's effects in pancreatic islets. Finally, BPA increased burst duration, reduced the amplitude of the action potential and enlarged the action potential half-width, leading to alteration in beta cell electrical activity. CONCLUSIONS/INTERPRETATION Our data suggest that BPA modulates the expression and function of Na+ and K+ channels via ERβ in mouse pancreatic islets. Furthermore, BPA alters beta cell electrical activity. Altogether, these BPA-induced changes in beta cells might play a role in the diabetogenic action of BPA described in animal models.
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Affiliation(s)
- Juan Martinez-Pinna
- Instituto de Biología Molecular y Celular (IBMC), Universitas Miguel Hernández, 03202, Elche, Spain
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universitas Miguel Hernández, Elche, Spain
- Departamento de Fisiología, Genética y Microbiología, Universidad de Alicante, Alicante, Spain
| | - Laura Marroqui
- Instituto de Biología Molecular y Celular (IBMC), Universitas Miguel Hernández, 03202, Elche, Spain
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universitas Miguel Hernández, Elche, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
| | - Abdelkrim Hmadcha
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
- Department of Cell Regeneration and Advanced Therapies, Andalusian Center for Molecular Biology and Regenerative Medicine-CABIMER, University of Pablo Olavide-University of Seville-CSIC, Seville, Spain
| | - Javier Lopez-Beas
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
- Department of Cell Regeneration and Advanced Therapies, Andalusian Center for Molecular Biology and Regenerative Medicine-CABIMER, University of Pablo Olavide-University of Seville-CSIC, Seville, Spain
| | - Sergi Soriano
- Instituto de Biología Molecular y Celular (IBMC), Universitas Miguel Hernández, 03202, Elche, Spain
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universitas Miguel Hernández, Elche, Spain
- Departamento de Fisiología, Genética y Microbiología, Universidad de Alicante, Alicante, Spain
| | - Sabrina Villar-Pazos
- Instituto de Biología Molecular y Celular (IBMC), Universitas Miguel Hernández, 03202, Elche, Spain
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universitas Miguel Hernández, Elche, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
| | - Paloma Alonso-Magdalena
- Instituto de Biología Molecular y Celular (IBMC), Universitas Miguel Hernández, 03202, Elche, Spain
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universitas Miguel Hernández, Elche, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
| | - Reinaldo S Dos Santos
- Instituto de Biología Molecular y Celular (IBMC), Universitas Miguel Hernández, 03202, Elche, Spain
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universitas Miguel Hernández, Elche, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
| | - Ivan Quesada
- Instituto de Biología Molecular y Celular (IBMC), Universitas Miguel Hernández, 03202, Elche, Spain
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universitas Miguel Hernández, Elche, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
| | - Franz Martin
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
- Department of Cell Regeneration and Advanced Therapies, Andalusian Center for Molecular Biology and Regenerative Medicine-CABIMER, University of Pablo Olavide-University of Seville-CSIC, Seville, Spain
| | - Bernat Soria
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
- Department of Cell Regeneration and Advanced Therapies, Andalusian Center for Molecular Biology and Regenerative Medicine-CABIMER, University of Pablo Olavide-University of Seville-CSIC, Seville, Spain
| | - Jan-Åke Gustafsson
- Department of Cell Biology and Biochemistry, Center for Nuclear Receptors and Cell Signaling, University of Houston, Houston, TX, USA
- Department of Biosciences and Nutrition, Karolinska Institut, Huddinge, Sweden
| | - Angel Nadal
- Instituto de Biología Molecular y Celular (IBMC), Universitas Miguel Hernández, 03202, Elche, Spain.
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universitas Miguel Hernández, Elche, Spain.
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain, .
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van Woerden I, Bruening M, Montresor-López J, Payne-Sturges DC. Trends and disparities in urinary BPA concentrations among U.S. emerging adults. ENVIRONMENTAL RESEARCH 2019; 176:108515. [PMID: 31195292 DOI: 10.1016/j.envres.2019.05.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/23/2019] [Accepted: 05/29/2019] [Indexed: 05/27/2023]
Abstract
BACKGROUND Emerging adulthood (ages 18-25 years) is a key turning point in the life course characterized by particularly poor eating behaviors (e.g., low in fruits and vegetables, and high in fast food) and weight gain. Emerging adults are also prime consumers of personal care and other consumer products that may result in differential exposures to environmental contaminants, such as Bisphenol A (BPA), compared to adults aged 26+ years. This is of concern given BPA has been associated with adverse health outcomes such as obesity, metabolic disorders, miscarriage, infertility and breast cancer. However, no research has examined exposure to BPA among emerging adults. OBJECTIVE To assess trends of exposure to urinary BPA among a representative sample of emerging adults compared to adults aged 26+ years. Secondarily, we aimed to identify differential associations between BPA concentrations and sociodemographic characteristics and BMI by age group. METHODS This study uses National Health and Examination Surveys (NHANES) over 2003-2014 to test differences in BPA concentrations comparing emerging adults to adults aged 26+ years. Generalized linear models predicting log BPA by age group and sex, race/ethnicity, education, income, and food security status, and generalized linear models predicting BMI by log BPA, both age group and age as a continuous variable, sex, race/ethnicity, education, income, and food security status were conducted. Interactions with age group (i.e., age group x sex) were examined for the mutually adjusted models. All models controlled for survey year, month, and time of day, and were run with, and without, an adjustment for urinary creatinine. RESULTS In models adjusted, and not adjusted, for urinary creatinine, emerging adults had a higher log BPA concentration than adults aged 26+ years (β=0.153, p=0.004; β=0.544, p<0.001), and a significantly steeper decline in BPA concentration between 2003-2004 and 2013-2014 than adults aged 26+ years (ß=-0.051, p=0.002; ß=-0.071, p=0.001). Males' log BPA concentration were lower than that for females when urinary creatinine was included in the model, and higher when urinary creatinine was excluded from the model (ß=-0.188, p<0.001; β=0.203, p<0.001). Higher income was significantly associated with lower log BPA concentration (ß=-0.220, p<0.001; ß=-0.166, p<0.001). A significant interaction between emerging adult age group and food security status was observed, which was associated with higher BPA exposures. Log BPA concentration was associated with BMI only when urinary creatinine was excluded from the models (urinary creatinine included: β=0.031, p=0.747; β=0.022, p=0.815, urinary creatinine excluded: β=0.528, p<0.001; β=0.552, p<0.001). CONCLUSION Findings indicate that emerging adults had higher BPA exposures than adults aged 26+ years in 2003-2004, and that emerging adults' exposure level has decreased faster than that of adults aged 26+ years. There were suggestions that the BPA concentration of emerging adults in 2013-2014 was lower than that for adults aged 26+ years, and that BPA exposure is associated with higher BMI. Our results highlight the need for additional research to identify the sources and routes of exposure to BPA and BPA replacements among emerging adults and to better characterize the variability in exposure. Intervention studies are needed to assist emerging adults in limiting their exposure to BPA, and potentially also the BPA alternatives.
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Affiliation(s)
- Irene van Woerden
- College of Nursing, Idaho State University, 921 South 8th Ave, Pocatello, ID, 83209, USA
| | - Meg Bruening
- College of Health Solutions, Arizona State University, 550 North 3rd Street, Phoenix, AZ, 85004, USA
| | - Jessica Montresor-López
- Maryland Institute for Applied Environmental Health, University of Maryland School of Public Health, 255 Valley Drive, College Park, MD, 20742, USA
| | - Devon C Payne-Sturges
- Maryland Institute for Applied Environmental Health, University of Maryland School of Public Health, 255 Valley Drive, College Park, MD, 20742, USA.
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Li Q, Zhang H, Zou J, Feng X, Feng D. Bisphenol A induces cholesterol biosynthesis in HepG2 cells via SREBP-2/HMGCR signaling pathway. J Toxicol Sci 2019; 44:481-491. [DOI: 10.2131/jts.44.481] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Qingrong Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-sen University, China
| | - Hongmin Zhang
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-sen University, China
| | - Jun Zou
- Department of Cardiology, Affiliated NanHai Hospital of Southern Medical University, China
| | - Xiang Feng
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-sen University, China
| | - Dan Feng
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-sen University, China
- Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, China
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Loganathan N, Salehi A, Chalmers JA, Belsham DD. Bisphenol A Alters Bmal1, Per2, and Rev-Erba mRNA and Requires Bmal1 to Increase Neuropeptide Y Expression in Hypothalamic Neurons. Endocrinology 2019; 160:181-192. [PMID: 30500912 PMCID: PMC6307099 DOI: 10.1210/en.2018-00881] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 11/27/2018] [Indexed: 12/17/2022]
Abstract
Bisphenol A (BPA), a ubiquitous environmental endocrine disruptor, is considered an obesogen. However, its role in the hypothalamic control of energy balance remains largely unexplored. Because disruption of the circadian clock is tightly associated with metabolic consequences, we explored how BPA affects the components of the molecular circadian clock in the feeding-related neurons of the hypothalamus. In immortalized POMC and NPY/AgRP-expressing hypothalamic cell lines and primary culture, we describe how BPA significantly alters mRNA expression of circadian clock genes Bmal1,Per2, and Rev-Erbα. Furthermore, we use newly generated Bmal1-knockout (KO) hypothalamic cell lines to link the BPA-induced neuropeptide dysregulation to the molecular clock. Specifically, BPA increased Npy, Agrp, and Pomc mRNA expression in wild type hypothalamic cells, whereas the increase in Npy, but not Agrp or Pomc, was abolished in cell lines lacking BMAL1. In line with this increase, BPA led to increased BMAL1 binding to the Npy promotor, potentially increasing Npy transcription. In conclusion, we show that BPA-mediated dysregulation of the circadian molecular clock is linked to the deleterious effects of BPA on neuropeptide expression. Furthermore, we describe hypothalamic Bmal1-KO cell lines to study the role of BMAL1 in hypothalamic responses to metabolic, hormonal, and environmental factors.
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Affiliation(s)
- Neruja Loganathan
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | - Ashkan Salehi
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | | | - Denise D Belsham
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
- Department of Obstetrics and Gynaecology, University of Toronto, Toronto, Ontario, Canada
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada
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Lee I, Kim S, Kim KT, Kim S, Park S, Lee H, Jeong Y, Lim JE, Moon HB, Choi K. Bisphenol A exposure through receipt handling and its association with insulin resistance among female cashiers. ENVIRONMENT INTERNATIONAL 2018; 117:268-275. [PMID: 29778011 DOI: 10.1016/j.envint.2018.05.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 05/05/2018] [Accepted: 05/05/2018] [Indexed: 06/08/2023]
Abstract
Bisphenol A (BPA) is one of the most widely used chemicals in various consumer products. In thermal papers such as receipts and tickets, BPA is used as a heat-activated developer. Cashiers are therefore suspected to be a vulnerable group of exposure to BPA, but neither contribution of receipt handling to the total body burden of BPA among cashiers, nor related health effects are well characterized. Female cashiers (n = 54) were recruited from seven retail shops of a major supermarket chain in Korea, and urinary levels of BPA and metabolic syndrome (MetS) related biomarkers were measured. In order to estimate the contribution of receipt handling to the body burden of BPA, an intervention was designed on the use of gloves: the subjects were asked not to wear gloves during the work for one week, and in the following week, to wear gloves. Urine samples were collected at pre-shift and post-shift for the first two consecutive days in each week, and urinary BPA concentrations were measured. In cashiers without gloves, about a two-fold increase in urinary BPA concentrations was observed after work-shift. When the cashiers wore gloves, however, urinary BPA levels showed no changes. Higher urinary BPA concentrations were associated with greater levels of fasting insulin and insulin resistance. Our observation shows that receipt handling among the cashiers could double the BPA exposure levels at post-shift compared to those at pre-shift, and use of simple protective equipment such as gloves could effectively reduce the BPA exposure levels.
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Affiliation(s)
- Inae Lee
- School of Public Health, Seoul National University, Seoul, Republic of Korea
| | - Sunmi Kim
- School of Public Health, Seoul National University, Seoul, Republic of Korea
| | - Ki-Tae Kim
- Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul, Republic of Korea
| | - Sungkyoon Kim
- School of Public Health, Seoul National University, Seoul, Republic of Korea
| | - Suhyun Park
- School of Public Health, Seoul National University, Seoul, Republic of Korea
| | - Hyojin Lee
- Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul, Republic of Korea
| | - Yunsun Jeong
- Department of Marine Science and Convergence Engineering, Hanyang University, Ansan, Republic of Korea
| | - Jae-Eun Lim
- Department of Marine Science and Convergence Engineering, Hanyang University, Ansan, Republic of Korea
| | - Hyo-Bang Moon
- Department of Marine Science and Convergence Engineering, Hanyang University, Ansan, Republic of Korea
| | - Kyungho Choi
- School of Public Health, Seoul National University, Seoul, Republic of Korea; Institute of Health and Environment, Seoul National University, Seoul, Republic of Korea.
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Rosin JM, Kurrasch DM. Bisphenol A and microglia: could microglia be responsive to this environmental contaminant during neural development? Am J Physiol Endocrinol Metab 2018; 315:E279-E285. [PMID: 29812986 DOI: 10.1152/ajpendo.00443.2017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
There is a growing interest in the functional role of microglia in the developing brain. In our laboratory, we have become particularly intrigued as to whether fetal microglia in the embryonic brain are susceptible to maternal challenges in utero (e.g., maternal infection, stress) and, if so, whether their precocious activation could then adversely influence brain development. One such challenge that is newly arising in this field is whether microglia might be downstream targets to endocrine-disrupting chemicals, such as the plasticizer bisphenol A (BPA), which functions in part by mimicking estrogen structure and function. A growing body of evidence demonstrates that gestational exposure to BPA has adverse effects on brain development, although the exact mechanisms are still emerging. Given that microglia express estrogen receptors and steroid-producing enzymes, microglia might be an unappreciated target of BPA. Mechanistically, we propose that BPA binding to estrogen receptors within microglia initiates transcription of downstream target genes, which then leads to activation of microglia that can then perhaps adversely influence brain development. Here, we first briefly outline the current understanding of how microglia may influence brain development and then describe how this literature overlaps with our understanding of BPA's effects during similar time points. We also outline the current literature demonstrating that BPA exposure affects microglia. We conclude by discussing our thoughts on the mechanisms through which exposure to BPA could disrupt normal microglia functions, ultimately affecting brain development that could potentially lead to lasting behavioral effects and perhaps even neuroendocrine diseases such as obesity.
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Affiliation(s)
- Jessica M Rosin
- Department of Medical Genetics, Cumming School of Medicine, University of Calgary , Calgary, Alberta , Canada
- Alberta Children's Hospital Research Institute, University of Calgary , Calgary, Alberta , Canada
- Hotchkiss Brain Institute, University of Calgary , Calgary, Alberta , Canada
| | - Deborah M Kurrasch
- Department of Medical Genetics, Cumming School of Medicine, University of Calgary , Calgary, Alberta , Canada
- Alberta Children's Hospital Research Institute, University of Calgary , Calgary, Alberta , Canada
- Hotchkiss Brain Institute, University of Calgary , Calgary, Alberta , Canada
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Bisphenol A and Metabolic Diseases: Challenges for Occupational Medicine. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2017; 14:ijerph14090959. [PMID: 28841159 PMCID: PMC5615496 DOI: 10.3390/ijerph14090959] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 08/21/2017] [Accepted: 08/21/2017] [Indexed: 02/08/2023]
Abstract
The prevalence of metabolic diseases has markedly increased worldwide during the last few decades. Lifestyle factors (physical activity, energy-dense diets), together with a genetic predisposition, are well known factors in the pathophysiology of health problems. Bisphenol A (BPA) is a chemical compound used for polycarbonate plastics, food containers, epoxy resins coating metallic cans for food and beverage conservation. The ability of BPA to act as an endocrine disruptor-xenoestrogen in particular-is largely documented in literature, with numerous publications of in vivo and in vitro studies as well as epidemiological data on humans. Recently, different researchers studied the involvement of BPA in the development of insulin resistance; evidences in this way showed a potential role in etiology of metabolic disease, both for children and for adults. We review the epidemiological literature in the relation between BPA exposure and the risk of metabolic diseases in adults, with a focus on occupational exposure. Considering published data and the role of occupational physicians in promoting Workers' Health, specific situations of exposure to BPA in workplace are described, and proposals for action to be taken are suggested. The comparison of the studies showed that exposure levels were higher in workers than in the general population, even if, sometimes, the measurement units used did not permit rapid comprehension. Nevertheless, occupational medicine focus on reproductive effects and not metabolic ones.
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