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Endocrine disrupting chemicals

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https://www.readbyqxmd.com/read/29036695/identifying-greener-and-safer-plasticizers-a-4-step-approach
#1
Océane Albert, Thomas C Nardelli, Barbara F Hales, Bernard Robaire
The health and economic burden of endocrine disrupting chemicals, such as the plasticizer di(2-ethylhexyl) phthalate (DEHP), is prompting industry to develop alternatives. However, the absence of requirements for manufacturers to ensure the safety of these alternatives has led to the generation of replacements that may have similar or worse effects than the original chemicals. Consequently, there is increasing recognition by scientists, regulators and industry that proactive approaches are needed to develop safe chemical substitutes...
August 2, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29029336/differential-effects-of-exposure-to-single-versus-a-mixture-of-endocrine-disrupting-chemicals-on-steroidogenesis-pathway-in-mouse-testes
#2
Julio Buñay, Eduardo Larriba, Daniel Patiño-Garcia, Leonor Cruz-Fernandes, Sergio Castañeda-Zegarra, María Rodriguez-Fernandez, Jesús Del Mazo, Ricardo D Moreno
Endocrine-disrupting chemicals (EDCs) generate reproductive dysfunctions affecting the biosynthesis of steroid hormones and genes of the steroidogenic pathway. EDCs effects are mainly reported as a result of exposure to single compounds. However, humans are environmentally exposed to a mixture of EDCs. Herein, we assess chronic exposure to single alkylphenols and phthalates versus a mixture in mouse testes histology and steroidogenesis. Pregnant mice were exposed through drinking water to: 0.3 mg/Kg-body weight (BW)/day of each phthalate (DEHP, DBP, BBP), 0...
September 22, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29028550/paternal-exposure-to-environmental-17-alpha-ethinylestradiol-concentrations-modifies-testicular-transcription-affecting-the-sperm-transcript-content-and-the-offspring-performance-in-zebrafish
#3
David G Valcarce, Elena Vuelta, Vanesa Robles, Maria Paz Herráez
The synthetic estrogen 17-α-ethinylestradiol (EE2), a major constituent in contraceptive pills, is an endocrine disrupting chemical (EDC) present in the aquatic environment at concentrations of ng/L. Developmental exposure to these low concentrations in fish can induce several disorders. Zebrafish (Danio rerio) is a perfect organism for monitoring the effects of environmental contaminants. Our hypothesis is that changes promoted by EE2 in the germ line of male adults could be transmitted to the unexposed progeny...
September 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29027649/sex-specific-effects-of-combined-exposure-to-chemical-and-non-chemical-stressors-on-neuroendocrine-development-a-review-of-recent-findings-and-putative-mechanisms
#4
REVIEW
Whitney J Cowell, Rosalind J Wright
PURPOSE OF REVIEW: Environmental toxicants and psychosocial stressors share many biological substrates and influence overlapping physiological pathways. Increasing evidence indicates stress-induced changes to the maternal milieu may prime rapidly developing physiological systems for disruption by concurrent or subsequent exposure to environmental chemicals. In this review, we highlight putative mechanisms underlying sex-specific susceptibility of the developing neuroendocrine system to the joint effects of stress or stress correlates and environmental toxicants (bisphenol A, alcohol, phthalates, lead, chlorpyrifos, and traffic-related air pollution)...
October 13, 2017: Current Environmental Health Reports
https://www.readbyqxmd.com/read/29023994/biosensors-classifications-medical-applications-and-future-prospective
#5
REVIEW
Hani A Alhadrami
Biosensors are devices that combine a biological material with a suitable platform for detection of pathogenic organisms, carcinogenic, mutagenic and/or toxic chemicals or for reporting a biological effect. In recent years, enormous number of different types of biosensors have been constructed and developed for several medical applications. The reason for that was primarily due to the numerous advantages and applications that can be offered by biosensors. This review article has been started with demonstrating the powerful of biosensor technologies versus analytical and conventional techniques...
October 10, 2017: Biotechnology and Applied Biochemistry
https://www.readbyqxmd.com/read/29019419/prenatal-exposure-to-endocrine-disruptors-and-reprogramming-of-adipogenesis-an-early-life-risk-factor-for-childhood-obesity
#6
Ayman El-Sayed Shafei, Enas Samir Nabih, Kirolos Atalla Shehata, Emad Sherif Mohamed Abd Elfatah, Abou Bakr Ahmed Sanad, Mohamed Yehia Marey, Abd Alla Mohamed Ahmed Hammouda, Mounir Mostafa Moussa Mohammed, Randa Mostafa, Mahmoud A Ali
Obesity is a global health problem. It is characterized by excess adipose tissue that results from either increase in the number of adipocytes or increase in adipocytes size. Adipocyte differentiation is a highly regulated process that involves the activation of several transcription factors culminating in the removal of adipocytes from the cell cycle and induction of highly specific proteins. Several other factors, including hormones, genes, and epigenetics, are among the most important triggers of the differentiation process...
October 11, 2017: Childhood Obesity
https://www.readbyqxmd.com/read/29017816/oral-and-dermal-diflubenzuron-exposure-causes-a-hypothalamic-pituitary-thyroid-hpt-axis-disturbance-in-the-mongolian-racerunner-eremias-argus
#7
Jing Chang, Huili Wang, Peng Xu, Baoyuan Guo, Jianzhong Li, Yinghuan Wang, Wei Li
Diflubenzuron (DFB) is a potential endocrine-disrupting chemical. However, its thyroid endocrine effect on reptiles has not been reported. In this study, immature lizards (Eremias argus) were exposed to 20 mg kg(-1) DFB once a week for 42 days through oral or dermal routes. Their body weight, plasma thyroid hormone levels, thyroid gland histology and the transcription of hypothalamic-pituitary-thyroid (HPT) axis-related genes in different tissues were assessed to explore the effects of DFB on the HPT axis of lizards...
October 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29017090/combinatory-effects-of-low-concentrations-of-17%C3%AE-etinylestradiol-and-citalopram-on-non-reproductive-behavior-in-adult-zebrafish-danio-rerio
#8
Tove Porseryd, Martin Kellner, Nasim Reyhanian Caspillo, Kristina Volkova, Lubna Elabbas, Shahid Ullah, Håkan Olsén, Patrik Dinnétz, Inger Porsch Hällström
Sewage effluents contain pharmaceuticals, personal care products and industrial chemicals, exposing aquatic organisms to complex mixtures. The consequences of exposure to combinations of different classes of drugs in fish are largely unknown. In this study, we exposed adult zebrafish (Danio rerio) males and females for two weeks to low, environmentally relevant concentrations of the endocrine disrupting chemical 17α-etinylestradiol (EE2) and the selective serotonin re-uptake inhibitor (SSRI) citalopram, alone and in combination, and analyzed behaviors of importance for population fitness, scototaxis (light/dark preference), the novel tank test and shoal cohesion...
October 4, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28992791/bisphenol-a-and-di-2-ethylhexyl-phthalate-exert-divergent-effects-on-apoptosis-and-the-wnt-%C3%AE-catenin-pathway-in-zebrafish-embryos-a-possible-mechanism-of-endocrine-disrupting-chemical-action
#9
Ünsal Veli Üstündağ, İsmail Ünal, Perihan Seda Ateş, A Ata Alturfan, Türkan Yiğitbaşı, Ebru Emekli-Alturfan
Polyethylene terephthalate (PET) and polycarbonate (PC) are the most commonly used plastics in water bottles. Di(2-ethylhexyl) phthalate (DEHP) is used as a plasticizer in PET plastics, and bisphenol A (BPA) is used to produce PC. Both DEHP and BPA are known for their potential endocrine disrupting effects. The Wnt/β-catenin signaling pathway has important roles in cell proliferation, cell specification and cell fate determination during embryonic development. Recent reports suggest a link between the Wnt/β-catenin signaling pathway and apoptosis...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28990514/bisphenol-a-in-reproduction-epigenetic-effects
#10
Rosanna Chianese, Jacopo Troisi, Sean Richards, Marika Scafuro, Silvia Fasano, Maurizio Guida, Riccardo Pierantoni, Rosaria Meccariello
BACKGROUND: Bisphenol A (BPA) is an endocrine disrupting chemical widely used in the manufacture of polycarbonate plastic and epoxy resin to produce a multitude of consumer products, food and drink containers, and medical devices. BPA is similar to estradiol in structure and thus interferes in steroid signalling with different outcomes on reproductive health depending on doses, life stage, mode, and timing of exposure. In this respect, it has an emerging and controversial role as a "reproductive toxicant" capable of inducing short and long-term effects including the modulation of gene expression through epigenetic modification (i...
October 9, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28988872/photocatalysis-of-bisphenol-a-by-an-easy-settling-titania-titanate-composite-effects-of-water-chemistry-factors-degradation-pathway-and-theoretical-calculation
#11
Xiao Zhao, Penghui Du, Zhengqing Cai, Ting Wang, Jie Fu, Wen Liu
Bisphenol A (BPA) is a widely concerned endocrine disrupting chemical and hard to be removed through conventional wastewater treatment processes. In this study, we developed a TiO2 decorated titanate nanotubes composite (TiO2/TNTs) and used for photocatalytic degradation of BPA. TEM and XRD analysis show that the TiO2/TNTs is a nano-composite of anatase and titanate, with anatase acting as the primary photocatalytic site and titanate as the skeleton. TiO2/TNTs exhibited excellent photocatalytic reactivity and its easy-settling property leaded to good reusability...
October 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28987728/environmental-chemicals-and-breast-cancer-an-updated-review-of-epidemiological-literature-informed-by-biological-mechanisms
#12
REVIEW
Kathryn M Rodgers, Julia O Udesky, Ruthann A Rudel, Julia Green Brody
BACKGROUND: Many common environmental chemicals are mammary gland carcinogens in animal studies, activate relevant hormonal pathways, or enhance mammary gland susceptibility to carcinogenesis. Breast cancer's long latency and multifactorial etiology make evaluation of these chemicals in humans challenging. OBJECTIVE: For chemicals previously identified as mammary gland toxicants, we evaluated epidemiologic studies published since our 2007 review. We assessed whether study designs captured relevant exposures and disease features suggested by toxicological and biological evidence of genotoxicity, endocrine disruption, tumor promotion, or disruption of mammary gland development...
October 5, 2017: Environmental Research
https://www.readbyqxmd.com/read/28987566/urinary-level-of-triclosan-in-a-population-of-chinese-pregnant-women-and-its-association-with-birth-outcomes
#13
Wenqian Huo, Wei Xia, Chuansha Wu, Yingshuang Zhu, Bin Zhang, Yanjian Wan, Aifen Zhou, Zhenming Qian, Zhong Chen, Yangqian Jiang, Hongxiu Liu, Jie Hu, Bing Xu, Shunqing Xu, Yuanyuan Li
Triclosan (TCS) is a suspected endocrine disrupting chemical which is widely used in consumer products as an antibacterial agent. But findings in human studies focusing on the fetal developmental effects of prenatal TCS exposure were rare and inconsistent. This study aimed to determine maternal urinary TCS and investigate its association with birth outcomes. Pregnant women (n = 1006) were randomly selected from the prospective Healthy Baby Cohort (HBC) enrolled in 2014. TCS levels were determined in maternal urine samples collected at delivery and recorded birth outcomes were obtained from the medical records...
October 4, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28986177/weight-of-evidence-approaches-for-the-identification-of-endocrine-disrupting-properties-of-chemicals-review-and-recommendations-for-eu-regulatory-application
#14
REVIEW
Melanie Gross, Richard M Green, Lennart Weltje, James R Wheeler
A Weight-of-evidence (WoE) evaluation should be applied in assessing all the available data for the identification of endocrine disrupting (ED) properties of chemicals. The European Commission draft acts specifying criteria under the biocidal products and plant protection products regulations require that WoE is implemented for the assessment of such products. However, only some general considerations and principles of how a WoE should be conducted are provided. This paper reviews WoE approaches to distil key recommendations specifically for the evaluation of potential ED properties of chemicals...
October 4, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28984376/applying-adverse-outcome-pathways-and-species-sensitivity-weighted-distribution-to-predicted-no-effect-concentration-derivation-and-quantitative-ecological-risk-assessment-for-bisphenol-a-and-4-nonylphenol-in-aquatic-environments-a-case-study-on-tianjin-city
#15
Ying Wang, Guangshui Na, Humin Zong, Xindong Ma, Xianhai Yang, Jingli Mu, Lijun Wang, Zhongsheng Lin, Zhifeng Zhang, Juying Wang, Jinsong Zhao
Adverse outcome pathways (AOPs) are a novel concept that effectively considers the toxic modes of action and guides the ecological risk assessment of chemicals. Here, to better use toxicity data including biochemical or molecular responses and mechanistic data, we further developed a species sensitivity-weighted distribution (SSWD) method for bisphenol A and 4-nonylphenol. Their aquatic predicted no-effect concentrations (PNECs) were derived using the log-normal statistical extrapolation method. We calculated aquatic PNECs of bisphenol A and 4-nonylphenol with values of 4...
October 6, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28980219/persistent-endocrine-disrupting-chemicals-and-fatty-liver-disease
#16
REVIEW
Andrea L Deierlein, Sarah Rock, Sally Park
PURPOSE OF REVIEW: Non-alcoholic fatty liver disease (NAFLD) is the most prominent chronic liver disease in Western countries, affecting approximately 25% of the population worldwide. Sex-specific differences in the development of NAFLD are apparent. While obesity and insulin resistance are major contributors to the increasing prevalence of NAFLD, a growing body of literature suggests that exposure to persistent endocrine-disrupting chemicals (pEDCs) may also play a role. This review summarizes recent (2011 and later) scientific literature investigating exposures to pEDCs, specifically persistent organic pollutants (POPs), and NAFLD, with a focus on sex-specific associations...
October 4, 2017: Current Environmental Health Reports
https://www.readbyqxmd.com/read/28980159/sexually-dimorphic-effects-of-early-life-exposures-to-endocrine-disruptors-sex-specific-epigenetic-reprogramming-as-a-potential-mechanism
#17
REVIEW
Carolyn McCabe, Olivia S Anderson, Luke Montrose, Kari Neier, Dana C Dolinoy
PURPOSE OF REVIEW: The genetic material of every organism exists within the context of regulatory networks that govern gene expression-collectively called the epigenome. Animal models and human birth cohort studies have revealed key developmental periods that are important for epigenetic programming and vulnerable to environmental insults. Thus, epigenetics represent a potential mechanism through which sexually dimorphic effects of early-life exposures such as endocrine-disrupting chemicals (EDCs) manifest...
October 4, 2017: Current Environmental Health Reports
https://www.readbyqxmd.com/read/28977589/retinoid-x-receptor-activation-alters-the-chromatin-landscape-to-commit-mesenchymal-stem-cells-to-the-adipose-lineage
#18
Bassem M Shoucri, Eric S Martinez, Timothy J Abreo, Victor T Hung, Zdena Moosova, Toshi Shioda, Bruce Blumberg
Developmental exposure to environmental factors has been linked to obesity risk later in life. Nuclear receptors are molecular sensors that play critical roles during development and, as such, are prime candidates to explain the developmental programming of disease risk by environmental chemicals. We have previously characterized the obesogen tributyltin (TBT), which activates the nuclear receptors peroxisome proliferator-activated receptor γ (PPARγ) and retinoid X receptor (RXR) to increase adiposity in mice exposed in utero...
October 1, 2017: Endocrinology
https://www.readbyqxmd.com/read/28975428/a-new-efficient-method-to-monitor-precocious-puberty-nationwide-in-france
#19
Annabel Rigou, Joëlle Le Moal, Juliane Léger, Alain Le Tertre, Jean-Claude Carel
Clinical precocious puberty (PP) is a disease, reputed to be on the increase and suspected to be linked to endocrine disrupting chemicals (EDC) exposure. Population-based epidemiological data are lacking in France and scarce elsewhere. We accessed the feasibility of monitoring PP nationwide in France in this context, using a nationwide existing database, the French National Health Insurance Information System. Here, we present the method we used with a step-by-step approach to build and select the most suitable indicator...
October 3, 2017: European Journal of Pediatrics
https://www.readbyqxmd.com/read/28974696/triclosan-disrupts-skn-1-nrf2-mediated-oxidative-stress-response-in-c-elegans-and-human-mesenchymal-stem-cells
#20
Dong Suk Yoon, Yoorim Choi, Dong Seok Cha, Peng Zhang, Seong Mi Choi, Mohammad Abdulmohsen Alfhili, Joseph Ryan Polli, DeQwon Pendergrass, Faten A Taki, Brahmam Kapalavavi, Xiaoping Pan, Baohong Zhang, T Keith Blackwell, Jin Woo Lee, Myon-Hee Lee
Triclosan (TCS), an antimicrobial chemical with potential endocrine-disrupting properties, may pose a risk to early embryonic development and cellular homeostasis during adulthood. Here, we show that TCS induces toxicity in both the nematode C. elegans and human mesenchymal stem cells (hMSCs) by disrupting the SKN-1/Nrf2-mediated oxidative stress response. Specifically, TCS exposure affected C. elegans survival and hMSC proliferation in a dose-dependent manner. Cellular analysis showed that TCS inhibited the nuclear localization of SKN-1/Nrf2 and the expression of its target genes, which were associated with oxidative stress response...
October 3, 2017: Scientific Reports
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