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Endocrine disruptors

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https://www.readbyqxmd.com/read/29329096/water-contamination-by-endocrine-disruptors-impacts-microbiological-aspects-and-trends-for-environmental-protection
#1
REVIEW
Caren Leite Spindola Vilela, João Paulo Bassin, Raquel Silva Peixoto
Hormone active agents constitute a dangerous class of pollutants. Among them, those agents that mimic the action of estrogens on target cells and are part of the group of endocrine-disruptor compounds (EDCs) are termed estrogenic EDCs, the main focus of this review. Exposure to these compounds causes a number of negative effects, including breast cancer, infertility and animal hermaphroditism. However, especially in underdeveloped countries, limited efforts have been made to warn people about this serious issue, explain the methods of minimizing exposure, and develop feasible and efficient mitigation strategies at different levels and in various environments...
January 9, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29328989/inhibition-of-udp-glucuronosyltransferases-ugts-by-phthalate-monoesters
#2
Zuo Du, Yun-Feng Cao, Sai-Nan Li, Cui-Min Hu, Zhi-Wei Fu, Chun-Ting Huang, Xiao-Yu Sun, Yong-Zhe Liu, Kun Yang, Zhong-Ze Fang
Phthalate monoesters are important metabolites of phthalate esters (PAEs) which have been extensively utilized in industry. This study aims to investigate the inhibition of phthalate monoesters on the activity of various isoforms of UDP-glucuronosyltransferases (UGTs), trying to elucidate the toxicity mechanism of environmental endocrine disruptors from the new perspectives. In vitro recombinant UGTs-catalyzed glucuronidation of 4-methylumbelliferone (4-MU) was employed to evaluate 8 kinds of phthalate monoesters on 11 sorts of main human UGT isoforms...
January 5, 2018: Chemosphere
https://www.readbyqxmd.com/read/29327191/iron-impregnated-zeolite-catalyst-for-efficient-removal-of-micropollutants-at-very-low-concentration-from-meurthe-river
#3
Hawraa Ayoub, Thibault Roques-Carmes, Olivier Potier, Bachar Koubaissy, Steve Pontvianne, Audrey Lenouvel, Cédric Guignard, Emmanuel Mousset, Hélène Poirot, Joumana Toufaily, Tayssir Hamieh
In this paper, for the first time, faujasite Y zeolite impregnated with iron (III) was employed as a catalyst to remove a real cocktail of micropollutants inside real water samples from the Meurthe river by the means of the heterogeneous photo-Fenton process. The catalyst was prepared by the wet impregnation method using iron (III) nitrate nonahydrate as iron precursor. First, an optimization of the process parameters was conducted using phenol as model macro-pollutant. The hydrogen peroxide concentration, the light wavelength (UV and visible) and intensity, the iron loading immobilized, as well as the pH of the solution were investigated...
January 11, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29323181/oral-exposure-of-low-dose-bisphenol-a-promotes-proliferation-of-dorsolateral-prostate-and-induces-epithelial-mesenchymal-transition-in-aged-rats
#4
Dong-Yan Huang, Cheng-Cheng Zheng, Qi Pan, Shuang-Shuang Wu, Xin Su, Lei Li, Jian-Hui Wu, Zu-Yue Sun
Bisphenol A (BPA) is a well-known endocrine disruptor compound reported to have prostate toxicity. This study aimed to assess the effect of BPA on the proliferation of dorsolateral prostate (DLP) and the expression of epithelial-mesenchymal transition (EMT)-related genes in aged rats. Male aged SD rats were treated with BPA (10.0, 30.0, and 90.0 µg/kg i.g., daily) or vehicle (i.g., daily) for 3 months. Treatment with BPA resulted in increased the expression of PCNA, DLP weight and DLP epithelial height compared with the control group (P < 0...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321978/toxicity-of-formulants-and-heavy-metals-in-glyphosate-based-herbicides-and-other-pesticides
#5
N Defarge, J Spiroux de Vendômois, G E Séralini
The major pesticides of the world are glyphosate-based herbicides (GBH), and their toxicity is highly debated. To understand their mode of action, the comparative herbicidal and toxicological effects of glyphosate (G) alone and 14 of its formulations were studied in this work, as a model for pesticides. GBH are mixtures of water, with commonly 36-48% G claimed as the active principle. As with other pesticides, 10-20% of GBH consist of chemical formulants. We previously identified these by mass spectrometry and found them to be mainly families of petroleum-based oxidized molecules, such as POEA, and other contaminants...
2018: Toxicology Reports
https://www.readbyqxmd.com/read/29317738/personal-care-product-use-as-a-predictor-of-urinary-concentrations-of-certain-phthalates-parabens-and-phenols-in-the-hermosa-study
#6
Kimberly P Berger, Katherine R Kogut, Asa Bradman, Jianwen She, Qi Gavin, Rana Zahedi, Kimberly L Parra, Kim G Harley
Use of personal care products, such as makeup, soaps, and sunscreen, may expose adolescent girls to potential endocrine disruptors, including phthalates, parabens, and other phenols. We evaluated the relationship between recent self-reported personal care product use and concentrations for urinary metabolites of phthalates, parabens, triclosan, and benzophenone-3 (BP-3) in 100 Latina adolescents. Girls who reported using makeup every day vs. rarely/never had higher urinary concentrations of monoethyl phthalate (MEP) (102...
January 9, 2018: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/29308453/bisphenol-a-substitutes-and-obesity-in-us-adults-analysis-of-a-population-based-cross-sectional-study
#7
Buyun Liu, Hans-Joachim Lehmler, Yangbo Sun, Guifeng Xu, Yuewei Liu, Geng Zong, Qi Sun, Frank B Hu, Robert B Wallace, Wei Bao
Background: Bisphenol F (BPF) and bisphenol S (BPS) are increasingly used to substitute bisphenol A (BPA), a widespread environmental endocrine disruptor and putative obesogen. However, studies on effects of BPF and BPS on obesity in humans are lacking. We examined the associations of BPA, BPF, and BPS exposure with obesity in U.S. adults. Methods: We included 1,521 participants aged 20 years or older from a cross-sectional study, the National Health and Nutrition Examination Survey 2013-2014...
June 2017: Lancet. Planetary Health
https://www.readbyqxmd.com/read/29290395/trace-analysis-of-estrogenic-compounds-in-surface-and-groundwater-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry-as-pyridine-3-sulfonyl-derivatives
#8
Alex Glineur, Bruno Barbera, Katherine Nott, Philippe Carbonnelle, Sébastien Ronkart, Georges Lognay, Eva Tyteca
Natural estrogens (estrone: E1, 17β-estradiol: E2, estriol: E3) and synthetic 17α-ethynylestradiol (EE2) are reported as strong endocrine disruptors even at extremely low concentrations. Therefore, the watch list from the European Commission regarding emerging aquatic pollutants recommended maximum detection limits of 0.035 ng/L for EE2 and 0.4 ng/L for E1 and E2. In this study, a UHPLC-ESI-MS/MS method allowing quantification of E1, E2, E3 and EE2 in aqueous matrices was developed. The analytes were derivatized using pyridine-3-sulfonyl chloride and a broad range of product ions were generated and their specificity was assessed by analyzing both surface and groundwater...
December 19, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29289779/screening-of-organic-pollutants-in-pet-hair-samples-and-the-significance-of-environmental-factors
#9
Xiana González-Gómez, Noelia Cambeiro-Pérez, Elena Martínez-Carballo, Jesús Simal-Gándara
Organic pollutants (OPs) represent a wide range of chemicals that are potentially harmful for human and wildlife health. Many of these pollutants have been identified as endocrine disruptors that can alter hormonal balance producing adverse biological effects such as neurotoxicity, reproductive disorders, carcinogenicity and hepatotoxicity. For years, hair has been selected as a non-invasive source to assess levels of animal contamination. In the present study, a multiclass screening method for determining about 60 organic pollutants in pet hair was designed and validated for qualitative and quantitative purposes...
December 28, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29289696/assessment-of-the-analgesic-dipyrone-as-a-possible-anti-androgenic-endocrine-disruptor
#10
Marcella Tapias Passoni, Maja Nørgaard Kristensen, Rosana Nogueira Morais, Claudia Woitkowiak, Ana Claudia Boareto, Bruna Andreotti da Silva Amaral, Nicole Grechi, Paulo Roberto Dalsenter, Cecilie Hurup Munkboel, Bjarne Styrishave, David Møbjerg Kristensen, Caroline Gomes, Bennard van Ravenzwaay, Anderson Joel Martino-Andrade
Mild analgesics have been associated with antiandrogenic effects, but there are no such studies on dipyrone, despite its high prevalence of use in many countries. We examined the production of steroid hormones in human H295R cells after exposure to dipyrone and two metabolites, 4-Methylaminoantipyrine (MAA) and 4-Aminoantipyrine (AA), as well as fetal testicular testosterone production in rats following maternal dipyrone exposure. Androgen agonistic/antagonistic effects were examined in vitro for dipyrone and its metabolites in the Yeast Androgen Screen (YAS) assay and in vivo for dipyrone through the Hershberger assay...
December 28, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29289284/exposure-to-endocrine-disrupting-chemicals-perturbs-lipid-metabolism-and-circadian-rhythms
#11
Renate Kopp, Irene Ozáez Martínez, Jessica Legradi, Juliette Legler
A growing body of evidence indicates that exposure to environmental chemicals can contribute to the etiology of obesity by inappropriately stimulating adipogenesis as well as perturbing lipid metabolism and energy balance. One potential mechanism by which chemical exposure can influence lipid metabolism is through disturbance of circadian rhythms, endogenously-driven cycles of roughly 24hr in length that coordinate biochemical, physiological, and behavioral processes in all organisms. Here we show for the first time that exposure to endocrine disrupting compounds (EDCs), including the pesticide tributyltin, two commercial flame retardants, and a UV-filter chemical found in sunscreens, can perturb both circadian clocks and lipid metabolism in vertebrates...
December 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29285703/phthalate-esters-in-surface-water-of-songhua-river-watershed-associated-with-land-use-types-northeast-china
#12
Zhidan Wen, Xiaoli Huang, Dawen Gao, Ge Liu, Chong Fang, Yingxin Shang, Jia Du, Ying Zhao, Lili Lv, Kaishan Song
The ubiquitous presence of phthalate esters (PAEs) in the environment and their potential role as endocrine disruptors of marine organisms has attracted much attention. The presence of PAEs in different water sources collected from the Songhua River mainstream and its tributaries has been determined in this study. The total concentration of the seven PAEs (∑PAEs) detected was found to range from 1.153 to 7.867 μg L-1, with di(2-ethylhexyl) phthalate (DEHP) present as the predominate PAE congener. Dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate (DBP), and DEHP were present in all of the water samples analyzed...
December 28, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29281496/study-of-the-occurrence-and-ecosystem-danger-of-selected-endocrine-disruptors-in-the-urban-water-cycle-of-the-city-of-bogot%C3%A3-colombia
#13
Diego F Bedoya-Ríos, Jaime A Lara-Borrero, Verónica Duque-Pardo, Carlos A Madera-Parra, Eliana M Jimenez, Andrés F Toro
Endocrine disruptors have been studied for their high occurrence in different environments including aquatic; however, in the context of developing countries, their occurrence, magnitude and potential threat have little information. This study involved the analysis of various components of the urban water cycle in the city of Bogotá, Colombia. As a result, it was found that the compounds with the highest occurrence are plasticizers such as phthalates and bisphenol A, whereas among the drugs, carbamazepine presented the highest concentrations (0...
December 27, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29278848/bisphenol-a-antagonizes-the-rapidly-modulating-effect-of-dht-on-spinogenesis-and-long-term-potentiation-of-hippocampal-neurons
#14
Yang Yang, Zhaoqing Fang, Yuhua Dai, Yu Wang, Yufeng Liang, Xiaoyu Zhong, Qinwen Wang, Yizhong Hu, Zigui Zhang, Donghong Wu, Xiaohong Xu
Bisphenol A (BPA), a common environmental endocrine disruptor, modulates estrogenic, antiestrogenic, and antiandrogenic effects throughout the lifespan. Recent studies found more obvious adverse effect of BPA on some neurobehavior in males than that in females. In this study, BPA at 10-100 nM rapidly increased the densities of the dendrite spine and synapse in cultured hippocampal neurons of rats in vitro within 1 h. Co-treatment of BPA (100 nM) with dihydrotestosterone (DHT, 10 nM) or with 17β-E2 (10 nM) completely eliminated the promotion of DHT or 17β-E2 in the densities of the dendritic spine and synapse...
December 23, 2017: Chemosphere
https://www.readbyqxmd.com/read/29277902/divergent-responsiveness-of-two-isoforms-of-the-estrogen-receptor-to-mixtures-of-contaminants-of-emerging-concern-in-four-vertebrates
#15
Satomi Kohno, Yoshinao Katsu, Nicholas Cipoletti, Lina C Wang, Zachary G Jorgenson, Shinichi Miyagawa, Heiko L Schoenfuss
Contaminants of emerging concern (CECs) are ubiquitous in aquatic environments with well-established endocrine-disrupting effects. A data matrix of 559 water samples was queried to identify two commonly occurring CECs mixtures in Great Lakes tributaries. One mixture consisted of eight agricultural CECs (AG), while another contained 11 urban CECs (UB). The known estrogenic compounds bisphenol A, estrone and nonylphenol were present in both mixtures. According to the EPA Tox21 in ToxCast database, AG and UB mixture at an environmentally relevant concentration were estimated to account for 6...
December 26, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29275183/endocrine-disruptors-in-soil-effects-of-bisphenol-a-on-gene-expression-of-the-earthworm-eisenia-fetida
#16
M Novo, I Verdú, D Trigo, J L Martínez-Guitarte
Xenobiotics such as bisphenol A (BPA), are present in biosolids, which are applied as organic fertilizers in agricultural fields. Their effects on soil life have been poorly assessed, and this is particularly important in the case of earthworms, which represent the main animal biomass in this medium. In the present work we study the impacts of BPA on gene expression of Eisenia fetida, a widely used ecotoxicological model. Chronic soil tests and acute contact tests were performed, and gene expression was analyzed in total tissue and in masculine reproductive organs of the earthworms...
December 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29273980/biorational-substitution-of-piperonyl-butoxide-in-organic-production-effectiveness-of-vegetable-oils-as-synergists-for-pyrethrums
#17
Patrice A Marchand, Claire Dimier-Vallet, Rodolphe Vidal
Piperonyl butoxide is a semi-synthetic synergist for natural pyrethrum and synthetic pyrethroid insecticides in phytochemicals and biocides. As such it is used in large quantities for crop treatments, stored grain protection, disinfestation of grain storage facilities and indoor uses. Piperonyl butoxide is consequently a regular contaminant in stored grains, and subsequently in corresponding cereal food products and meat via feed uses. Therefore it is regularly monitored and its MRL is ongoing a reassessment...
December 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29241697/opening-the-black-box-of-endocrine-disruption-of-brain-development-lessons-from-the-characterization-of-bisphenol-a
#18
REVIEW
Dinushan Nesan, Laronna C Sewell, Deborah M Kurrasch
Bisphenol A (BPA) is among the best-studied endocrine disrupting chemicals, known to act via multiple steroid hormone receptors to mediate a myriad of cellular effects. Pre-, peri-, and postnatal BPA exposure have been linked to a variety of altered behaviors in multiple model organisms, ranging from zebrafish to frogs to mammalian models. Given that BPA can cross the human placental barrier and has been found in the serum of human fetuses during gestation, BPA has been postulated to adversely affect ongoing neurodevelopment, ultimately leading to behavioral disorders later in life...
December 11, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/29229539/bisphenol-a-bpa-and-cell-signaling-pathways
#19
REVIEW
Masaharu Murata, Jeong-Hun Kang
Bisphenol A (BPA; 4,4'-isopropylidenediphenol) is an endocrine disruptor that is used as a material for the production of phenol resins, polyacrylates, polyesters, epoxy resins, and polycarbonate plastics. Endocrine-disruptive or toxic effects of BPA on living organisms through a number of cell signaling pathways have been reported. BPA induces carcinogenesis, reproductive toxicity, abnormal inflammatory or immune response, and developmental disorders of brain or nervous system through various cell signaling pathways...
December 8, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/29228129/prenatal-exposure-to-di-2-ethylhexyl-phthalate-causes-long-term-transgenerational-effects-on-female-reproduction-in-mice
#20
Emily Brehm, Saniya Rattan, Liying Gao, Jodi A Flaws
Di(2-ethylhexyl) phthalate (DEHP) is a plasticizer in many consumer products. Although DEHP is a known endocrine disruptor, little is known about the effects of DEHP exposure on female reproduction. Thus, this study tested the hypothesis that prenatal DEHP exposure affects follicle numbers, estrous cyclicity, and hormone levels in multiple generations of mice. Pregnant CD-1 mice were orally dosed with corn oil (vehicle control) or DEHP (20 and 200 µg/kg/day, and 500 and 750 mg/kg/day) from gestation day 10...
December 7, 2017: Endocrinology
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