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Endocrine disruption chemical

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https://www.readbyqxmd.com/read/29355495/endocrine-active-metals-prenatal-stress-and-enhanced-neurobehavioral-disruption
#1
Marissa Sobolewski, Katherine Conrad, Elena Marvin, Joshua L Allen, Deborah A Cory-Slechta
Metals, including lead (Pb), methylmercury (MeHg) and arsenic (As), are long-known developmental neurotoxicants. More recently, environmental context has been recognized to modulate metals toxicity, including nutritional state and stress exposure. Modulation of metal toxicity by stress exposure can occur through shared targeting of endocrine systems, such as the hypothalamic-pituitary-adrenal axis (HPA). Our previous rodent research has identified that prenatal stress (PS) modulates neurotoxicity of two endocrine active metals (EAMs), Pb and MeHg, by altering HPA and CNS systems disrupting behavior...
January 17, 2018: Hormones and Behavior
https://www.readbyqxmd.com/read/29354353/mineralization-of-high-concentrations-of-the-endocrine-disruptor-dibutyl-phthalate-by-fusarium-culmorum
#2
Miriam Ahuactzin-Pérez, Saúl Tlecuitl-Beristain, Jorge García-Dávila, Ericka Santacruz-Juárez, Manuel González-Pérez, María Concepción Gutiérrez-Ruíz, Carmen Sánchez
Dibutyl phthalate (DBP) is a widely used plasticizer, whose presence in the environment as a pollutant raises concern because of its endocrine-disrupting toxicity. Growth kinetics, glucose uptake, biodegradation constant of DBP (k), half-life of DBP biodegradation (t1/2) and percentage of removal efficiency (%E) were evaluated for Fusarium culmorum grown on media containing glucose and different concentrations of DBP (500 and 1000 mg/l). Intermediate compounds of biodegraded DBP were identified by GC-MS and a novel DBP biodegradation pathway was proposed on the basis of the intermolecular flow of electrons of the intermediates identified using quantum chemical modeling...
January 2018: 3 Biotech
https://www.readbyqxmd.com/read/29349513/3d-qsar-study-of-steroidal-and-azaheterocyclic-human-aromatase-inhibitors-using-quantitative-profile-of-protein-ligand-interactions
#3
Sehan Lee, Mace G Barron
Aromatase is a member of the cytochrome P450 superfamily responsible for a key step in the biosynthesis of estrogens. As estrogens are involved in the control of important reproduction-related processes, including sexual differentiation and maturation, aromatase is a potential target for endocrine disrupting chemicals as well as breast cancer therapy. In this work, 3D-QSAR combined with quantitative profile of protein-ligand interactions was employed in the identification and characterization of critical steric and electronic features of aromatase-inhibitor complexes and the estimation of their quantitative contribution to inhibition potency...
January 18, 2018: Journal of Cheminformatics
https://www.readbyqxmd.com/read/29339303/estrogenic-activity-of-cylindrospermopsin-and-anatoxin-a-and-their-oxidative-products-by-feiii-b-h2o2
#4
Jishan Liu, Sandra E Hernández, Simon Swift, Naresh Singhal
The cyanotoxins released into waters during cyanobacterial blooms can pose serious hazards to humans and animals. Apart from their toxicological mechanisms, cyanotoxins have been shown to be involved in estrogenic activity by in vivo and in vitro assays; however, there is limited information on the change in estrogenicity of cyanotoxins following chemical oxidation. In this study, the estrogenic activity of cylindrospermopsin (CYL) and anatoxin-a (ANA) at concentrations ranging from 2.4 × 10-7 M to 2...
January 10, 2018: Water Research
https://www.readbyqxmd.com/read/29330967/the-impact-of-bisphenol-s-on-bovine-granulosa-and-theca-cells
#5
K A Campen, M Lavallee, Cmh Combelles
Bisphenol S (BPS) is an endocrine-disrupting chemical with multiple potential mechanisms of action, including as an oestrogen receptor agonist. BPS is increasingly used in plastics and thermal receipts as a substitute for bisphenol A, which has been phased out due to concerns about human health implications. The ability of BPS to alter female reproductive function in mammals has not been widely studied, despite the importance of normal hormone signalling for female reproduction. The aim of this study was to investigate how BPS (in a wide range of doses, including very low doses) affects granulosa cell and theca cell steroid hormone production and cell viability in the bovine...
January 12, 2018: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29329451/epidermal-growth-factor-receptor-signaling-disruption-by-endocrine-and-metabolic-disrupting-chemicals
#6
Josiah E Hardesty, Laila Al-Eryani, Banrida Wahlang, K Cameron Falkner, Hongxue Shi, Jian Jin, Brad Vivace, Brian P Ceresa, Russell A Prough, Matthew C Cave
Background: The purpose of this study is to identify an environmentally relevant shared receptor target for endocrine and metabolism disrupting chemical pollutants. A feature of the tested chemicals was that they induced Cyp2b10 in vivo implicating activation of the constitutive androstane receptor (CAR). Recent studies suggest that these compounds could be indirect CAR activators via epidermal growth factor receptor (EGFR) inhibition. Methods: Assays included a CAR activity reporter assay, EGF endocytosis assay, and EGFR phosphorylation assay...
January 10, 2018: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29329082/the-domestic-fowl-gallus-gallus-domesticus-embryo-as-an-alternative-for-mammalian-experiments-validation-of-a-test-method-for-the-detection-of-endocrine-disrupting-chemicals
#7
Luzie Jessl, Jessica Scheider, Jörg Oehlmann
In recent decades the embryo of Gallus g. domesticus has been widely used as a model for the study of early sexual development and the potential impact of substances affecting development, including endocrine disrupting chemicals (EDCs). Since there is no standardized procedure available for experiments with the chicken embryo, the objective of our project is to expedite the protocol to assess the potential effects of EDCs on early sexual differentiation. The main aim of the present study was to systematically investigate the natural variability of individual developmental and histological key parameters in untreated and solvent-treated control groups, since this has been insufficiently addressed so far...
December 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/29328408/genistein-attenuates-di%C3%A2-2%C3%A2-ethylhexyl-phthalate-induced-testicular-injuries-via-activation-of-nrf2-ho%C3%A2-1-following-prepubertal-exposure
#8
Liandong Zhang, Hecheng Li, Ming Gao, Tongdian Zhang, Zhizhong Wu, Ziming Wang, Tie Chong
Di‑(2‑ethylhexyl) phthalate (DEHP) and genistein (GEN) are of the most common endocrine disrupting chemicals (EDCs) present in the environment or the diet. However, investigation of the effects of acute exposure to these two EDCs during prepuberty has been lacking. In this study, DEHP and GEN were administrated to prepubertal male Sprague‑Dawley rats by gavage from PND22 to PND35 with vehicle control, GEN 50 mg/kg body weight (bw)/day, DEHP50, 150 and 450 mg/kg bw/day, and combined treatment. Reproductive parameters including testis weight, anogenital distance and organ coefficient were evaluated on PND36...
January 9, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29322544/role-of-bisphenol-a-as-environmental-factor-in-the-promotion-of-non-alcoholic-fatty-liver-disease-in%C3%A2-vitro-and-clinical-study
#9
M Dallio, M Masarone, S Errico, A G Gravina, C Nicolucci, R Di Sarno, L Gionti, C Tuccillo, M Persico, P Stiuso, N Diano, C Loguercio, A Federico
BACKGROUND: Bisphenol A is an endocrine disrupting chemical associated with type 2 diabetes mellitus (T2DM), cardiovascular disease and liver enzyme abnormalities. AIM: To evaluate bisphenol A plasma and urine levels in non-alcoholic fatty liver disease (NAFLD) patients compared to healthy subjects. Furthermore, we evaluated, in human HepG2 cells, the effects of exposure to different concentrations of bisphenol A on both oxidative stress induction and cell proliferation...
January 11, 2018: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/29321978/toxicity-of-formulants-and-heavy-metals-in-glyphosate-based-herbicides-and-other-pesticides
#10
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/29317319/the-molecular-mechanisms-of-action-of-the-endocrine-disrupting-chemical-bisphenol-a-in-the-development-of-cancer
#11
REVIEW
Ayman E Shafei, Maggie M Ramzy, Abdelhares I Hegazy, Ahmed K Husseny, Usama G El-Hadary, Mazen M Taha, Ali A Mosa
The endocrine disrupting chemical (EDC) is an exogenous substance or mixture that alters the function of the endocrine system and consequently causes adverse effects in intact organisms. Bisphenol A (BPA), one of the most common endocrine disrupting chemicals is a carbon-based synthetic compound used in the production of water bottles, cans, and teeth suture materials. It is known to be a xenoestrogen as it interacts with estrogen receptors and acts as agonist or antagonist via estrogen receptor-dependent signaling pathways...
January 6, 2018: Gene
https://www.readbyqxmd.com/read/29310425/treatment-with-phytoestrogens-reversed-triclosan-and-bisphenol-a-induced-anti-apoptosis-in-breast-cancer-cells
#12
Geum-A Lee, Kyung-Chul Choi, Kyung-A Hwang
Triclosan (TCS) and bisphenol A (BPA) are endocrine-disrupting chemicals that interfere with the hormone or endocrine system and may cause cancer. Kaempferol (Kaem) and 3,3'-diindolylmethane (DIM) are phytoestrogens that play chemopreventive roles in the inhibition of carcinogenesis and cancer progression. In this study, the influence of TCS, BPA, Kaem, and DIM on proliferation and apoptotic abilities of VM7Luc4E2 breast cancer cells were examined. MTT assay revealed that TCS (0.1-10 μM), BPA (0.1-10 μM) and E2 (0...
January 9, 2018: Biomolecules & Therapeutics
https://www.readbyqxmd.com/read/29307043/plastic-toys-as-a-source-of-exposure-to-bisphenol-a-and-phthalates-at-childcare-facilities
#13
Gangadhar Andaluri, Muruganandham Manickavachagam, Rominder Suri
Infants and toddlers are constantly exposed to toys at childcare facilities. Toys are made of a variety of plastics that often use endocrine-disrupting chemicals such as bisphenol-A (BPA) and phthalates as their building blocks. The goal of this study was to assess the non-dietary exposure of infants and toddlers to BPA and phthalates via leaching. We have successfully developed wipe tests to evaluate the leachability of BPA and phthalates from toys used at several day care facilities in Philadelphia. Our studies have shown an average leaching of 13-280 ng/cm2 of BPA and phthalates...
January 6, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29301538/hair-product-use-age-at-menarche-and-mammographic-breast-density-in-multiethnic-urban-women
#14
Jasmine A McDonald, Parisa Tehranifar, Julie D Flom, Mary Beth Terry, Tamarra James-Todd
BACKGROUND: Select hair products contain endocrine disrupting chemicals (EDCs) that may affect breast cancer risk. We hypothesize that, if EDCs are related to breast cancer risk, then they may also affect two important breast cancer risk factors: age at menarche and mammographic breast density. METHODS: In two urban female cohorts (N = 248): 1) the New York site of the National Collaborative Perinatal Project and 2) the New York City Multiethnic Breast Cancer Project, we measured childhood and adult use of hair oils, lotions, leave-in conditioners, root stimulators, perms/relaxers, and hair dyes using the same validated questionnaire...
January 4, 2018: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/29301181/childhood-obesity-and-endocrine-disrupting-chemicals
#15
REVIEW
Jin Taek Kim, Hong Kyu Lee
The prevalence of obesity around the world has increased sharply. Strong evidence has emerged over the last decades that human exposure to numerous endocrine disrupting chemicals (EDCs) is the cause of obesity and obesity-related metabolic diseases. Many EDCs are manmade chemicals that are released into the environment. EDCs are exogenous compounds that interfere with hormonal regulation and normal endocrine systems, thereby affecting the health of animals and humans. The number of chemicals belonging to EDCs is increasing and some of them are very stable; they persist in the environment (persistent organic pollutants)...
December 2017: Annals of Pediatric Endocrinology & Metabolism
https://www.readbyqxmd.com/read/29300916/effects-of-perinatal-exposure-to-phthalates-and-a-high-fat-diet-on-maternal-behavior-and-pup-development-and-social-play
#16
Daniel G Kougias, Laura R Cortes, Laura Moody, Steven Rhoads, Yuan-Xiang Pan, Janice M Juraska
Humans are ubiquitously exposed to many phthalates, a class of endocrine-disrupting chemicals commonly used in many consumer goods, and diet, especially fatty foods, is presumed to be a major source of exposure. Here, we use a rat model of human prenatal exposure to investigate the potential interactive effects of an environmentally relevant mixture of phthalates and a maternal high-fat diet (HFD). From gestation through postnatal day (P)10, dams consumed the mixture of phthalates (0, 200, or 1000 μg/kg/day) and were fed a control or HFD...
December 28, 2017: Endocrinology
https://www.readbyqxmd.com/read/29300862/reproductive-alterations-in-chronically-exposed-female-mice-to-environmentally-relevant-doses-of-a-mixture-of-phthalates-and-alkylphenols
#17
Daniel Patiño-García, Leonor Cruz-Fernandes, Julio Buñay, Jaime Palomino, Ricardo D Moreno
Endocrine-disrupting chemicals (EDCs) are exogenous compounds that modify hormone biosynthesis, causing adverse effects to human health. Among them, phthalates, and alkylphenols are important due to their wide use in plastics, detergents, personal care products, cosmetics and food packaging. However, their conjoint effects over reproductive female health have not been addressed. The aim of this work was to test the effect of chronically exposed female mice to a mixture of three phthalates [bis (2-ethylhexyl), dibutyl and benzyl butyl] and two alkylphenols [4-nonylphenol and 4-tert-octylphenol], from conception to adulthood at environmentally relevant doses...
December 28, 2017: Endocrinology
https://www.readbyqxmd.com/read/29299127/adverse-stimulation-of-4-nonylphenol-in-abnormal-reproductive-organs-of-female-chickens
#18
Fenghua Zhang, Peng Yang, Lei Qin, Jie Zhang
4-Nonylphenol (4-NP) is a known endocrine disrupting chemical and a persistent environmental contaminant. However, the 4-NP caused mechanism of reproductive toxicity still remains largely unknown in birds. In this study, female chickens (Hy-Line Variety White) were dosed via oral gavage in the early laying period with 0, 50, 100, and 200 mg 4-NP/kg/d for 60 days. Food intake and weight increase were monitored in this organism to investigate chicken growth and development. Moreover, pathological changes of reproductive organs, serum hormone, and mRNA changes on the HPOA were detected...
December 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/29295509/endocrine-disrupting-chemicals-mediated-through-binding-androgen-receptor-are-associated-with-diabetes-mellitus
#19
REVIEW
Sugunadevi Sakkiah, Tony Wang, Wen Zou, Yuping Wang, Bohu Pan, Weida Tong, Huixiao Hong
Endocrine disrupting chemicals (EDCs) can mimic natural hormone to interact with receptors in the endocrine system and thus disrupt the functions of the endocrine system, raising concerns on the public health. In addition to disruption of the endocrine system, some EDCs have been found associated with many diseases such as breast cancer, prostate cancer, infertility, asthma, stroke, Alzheimer's disease, obesity, and diabetes mellitus. EDCs that binding androgen receptor have been reported associated with diabetes mellitus in in vitro, animal, and clinical studies...
December 23, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29289908/comparison-of-the-effects-of-constant-and-pulsed-exposure-with-equivalent-time-weighted-average-concentrations-of-the-juvenile-hormone-analog-pyriproxyfen-on-the-reproduction-of-daphnia-magna
#20
Haruna Watanabe, Shigeto Oda, Ryoko Abe, Yoshinari Tanaka, Norihisa Tatarazako
Short-term pulsed exposure tests have been increasingly used to evaluate the ecotoxicity of pollutants of which concentrations vary over time in the field. In pulsed exposure, time-weighted average (TWA) concentration is often used as an index of exposure. However, there have been few studies to demonstrate whether TWA concentration can be used to evaluate the effect of endocrine-disrupting chemicals on the daphnids. Pyriproxyfen is one of the juvenile hormone analogs that induces daphnids to produce male offspring...
December 22, 2017: Chemosphere
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