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Endocrine disruption chemical

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https://www.readbyqxmd.com/read/28745404/testicular-oocytes-in-smallmouth-bass-in-northeastern-minnesota-in-relation-to-varying-levels-of-human-activity
#1
Sarah M Kadlec, Rodney D Johnson, David R Mount, Jennifer H Olker, Brian D Borkholder, Patrick K Schoff
Testicular oocytes (TOs) have been found in black basses (Micropterus spp.) from many locations in North America. The presence of TOs is often assumed to imply exposure to estrogenic endocrine disrupting compounds (EDCs), however, a definitive causal relationship has yet to be established, and TO prevalence is not consistently low in fish from areas lacking evident EDC sources. This might indicate any of a number of situations: (a) unknown or unidentified EDCs or EDC sources, (b) induction of TOs by other stressors, or (c) TOs occurring spontaneously during normal development...
July 26, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28740182/ultrahigh-adsorption-and-singlet-oxygen-mediated-degradation-for-efficient-synergetic-removal-of-bisphenol-a-by-a-stable-zirconium-porphyrin-metal-organic-framework
#2
Ai-Na Meng, Ling-Xiao Chaihu, Huan-Huan Chen, Zhi-Yuan Gu
Bisphenol A (BPA), one of 23 most important endocrine disrupting chemicals, was efficiently removed and sequentially photodegraded by a zirconium-porphyrin metal-organic framework (MOF) catalyst under visible light for water treatment. Well control of photodegradation allows the kinetic separation of adsorption step and photodegradation step. Ultrahigh adsorption uptake of 487.69 ± 8.37 mg g(-1) is observed, while efficient photodegradation could be observed within 20 min at the rate of 0.004 mg min(-1)...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28736785/rapid-and-ultrasensitive-detection-of-endocrine-disrupting-chemicals-using-a-nanosensor-enabled-cell-based-platform
#3
Ngoc D B Le, Xian Wang, Yingying Geng, Rui Tang, Gulen Yesilbag Tonga, Ziwen Jiang, Vincent M Rotello
Endocrine disrupting chemicals (EDCs) interact with estrogen receptors (ERs), causing a broad range of adverse health effects. Current assays for EDC activity are slow and often lack sensitivity. We report here an ultra-sensitive nanosensor that can detect estrogenic cellular changes in ER(+) MCF-7 cells rapidly (minutes) at several orders of magnitude lower than the generally used assays. Notably, the sensor responses at these ultra-low EDC levels correlated with an increased synthesis phase (S-phase) cell population of EDC-treated cells...
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28736254/bisphenol-a-affects-trophoblast-invasion-by-inhibiting-cxcl8-expression-in-decidual-stromal-cells
#4
Xiaoqian Li, Yina Wang, Pu Wei, Dongyan Shi, Shuang Wen, Fengjiao Wu, Lixin Liu, Ninghe Ye, Hong Zhou
Bisphenol A (BPA), an environmental endocrine-disrupting organic chemical, has been positively associated with the rate of implantation failure of in vitro fertilization. However, the underlying mechanisms remain unclear. To reveal the impact and the underlying mechanism of BPA on the crosstalk between trophoblast and decidual stromal cells (DSCs), we determined whether BPA was able to affect trophoblast invasion in vitro. We found that BPA significantly inhibited CXCL8 expression in DSCs, which hindered trophoblast invasion, and activated the phosphorylation of ERK in DSCs...
July 20, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28735033/nf-%C3%AE%C2%BAb-vimentin-is-involved-in-steroidogenesis-stimulated-by-mono-butyl-phthalate-in-primary-cultured-ovarian-granulosa-cells
#5
Chang Zhang, Pan Gong, Yan Ye, Lulu Zhang, Minjian Chen, Yanhui Hu, Aihua Gu, Shanshan Chen, Yubang Wang
Di-n-butyl phthalate (DBP) and its active metabolite, monobutyl phthalate (MBP) are the most common endocrine disrupting chemicals. Many studies indicated the effects of MBP on male steroidogenesis, however, little attention have been paid on the effects of low levels of MBP on female steroidogenesis. This study was aimed to assess steroidogenesis stimulated by low-dose MBP on primary cultured ovarian granulosa cells (mGCs). Ovarian granulosa cells were isolated from ICR female mice. Hormone levels in medium were detected by ELISA, mRNA and protein expressions of vimentin, NF-κB p65 and phosphorylation of NF-κB p65 (p-p65) were assayed by qRT-PCR, western blot and immunohistochemistry, respectively...
July 19, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28731686/pyrethroid-insecticide-cypermethrin-accelerates-pubertal-onset-in-male-mice-via-disrupting-hypothalamic-pituitary-gonadal-axis
#6
Xiaoqing Ye, Feixue Li, Jianyun Zhang, Huihui Ma, Dapeng Ji, Xin Huang, Thomas E Curry, Weiping Liu, Jing Liu
Pyrethroids, a class of insecticides that are widely used worldwide, have been identified as endocrine-disrupting chemicals (EDCs). Our recent epidemiological study reported on an association of increased pyrethroids exposure with elevated gonadotropins levels and earlier pubertal development in Chinese boys. In this study, we further investigated the effects of cypermethrin (CP), one of the most ubiquitous pyrethroid insecticides, on hypothalamic-pituitary-gonadal (HPG) axis and pubertal onset in male animal models...
July 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28728138/first-trimester-urinary-bisphenol-a-concentration-in-relation-to-anogenital-distance-an-androgen-sensitive-measure-of-reproductive-development-in-infant-girls
#7
Emily S Barrett, Sheela Sathyanarayana, Omar Mbowe, Sally W Thurston, J Bruce Redmon, Ruby H N Nguyen, Shanna H Swan
INTRODUCTION: Evidence from animal models suggests that prenatal exposure to bisphenol A (BPA), a ubiquitous endocrine-disrupting chemical, is associated with adverse reproductive outcomes in females. Exposure during early gestation, a critical period for reproductive development, is of particular concern. Anogenital distance (AGD) is a sensitive biomarker of the fetal hormonal milieu and a measure of reproductive toxicity in animal models. In some studies, the daughters of BPA-exposed dams have shorter AGD than controls...
July 11, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28728123/analysis-of-sugarcane-herbicides-in-marine-turtle-nesting-areas-and-assessment-of-risk-using-in%C3%A2-vitro-toxicity-assays
#8
Hannah L Allan, Jason P van de Merwe, Kimberly A Finlayson, Jake W O'Brien, Jochen F Mueller, Frederic D L Leusch
Agricultural processes are associated with many different herbicides that can contaminate surrounding environments. In Queensland, Australia, herbicides applied to agricultural crops may pose a threat to valuable coastal habitats including nesting beaches for threatened loggerhead turtles (Caretta caretta). This study 1) measured concentrations of herbicides in the beach sand of Mon Repos, an important marine turtle nesting beach in Australia that is adjacent to significant sugarcane crops, and 2) investigated the toxicity of these herbicides to marine turtles using a cell-based assay...
July 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28724251/concurrent-exposures-to-nonylphenol-bisphenol-a-phthalates-and-organophosphate-pesticides-on-birth-outcomes-a-cohort-study-in-taipei-taiwan
#9
Yu-Fang Huang, Wen-Chi Pan, Yen-An Tsai, Chia-Huang Chang, Pei-Jung Chen, Yi-Shuan Shao, Ming-Song Tsai, Jia-Woei Hou, Chensheng Alex Lu, Mei-Lien Chen
Prenatal exposure to phenols, phthalates (PAEs), and organophosphate (OP) pesticides may increase the risk of abnormal birth outcomes. However, many previous studies have examined exposure to a limited number of chemical classes or exposure profiles limited to a specific stage of pregnancy. This study aims to characterize the concurrent exposure scenario throughout pregnancy by simultaneously monitoring internal doses of several endocrine-disrupting compounds (EDCs), including 2 phenols (nonylphenol (NP) and bisphenol A (BPA)), 9 PAEs, and 6 OP pesticide metabolites and to assess the relationships between concurrent exposure to EDCs and infant birth weight, length, and head and chest circumference...
July 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28719870/effects-of-endocrine-disrupting-chemicals-on-estrogen-receptor-alpha-and-heat-shock-protein-60-gene-expression-in-primary-cultures-of-loggerhead-sea-turtle-caretta-caretta-erythrocytes
#10
Paolo Cocci, Martina Capriotti, Gilberto Mosconi, Francesco Alessandro Palermo
The loggerhead turtle (Caretta caretta) can be considered a good indicator species for studying the ecological impact of endocrine disrupting chemicals (EDCs) on wildlife. However, the effect of these environmental pollutants on nuclear steroid hormone signaling has not yet been addressed in sea turtles mainly due to the legal constraints of their endangered status. Here we describe the use of primary erythrocyte cell cultures as in vitro models for evaluating the effects of different EDCs on the expression of estrogen receptor α (ERα)...
July 15, 2017: Environmental Research
https://www.readbyqxmd.com/read/28711770/multigenerational-effects-evaluation-of-the-flame-retardant-tris-2-butoxyethyl-phosphate-tboep-using-daphnia-magna
#11
Maeva Giraudo, Maxime Dubé, Mélanie Lépine, Pierre Gagnon, Mélanie Douville, Magali Houde
Tris(2-butoxyethyl) phosphate (TBOEP) is an organophosphate ester used as substitute following the phase-out of brominated flamed retardants. Because of its high production volume and its use in a broad range of applications, this chemical is now frequently detected in the environment and biota. However, limited information is available on the long-term effects of TBOEP in aquatic organisms. In this study, Daphnia magna were exposed over three 21d generations to an environmentally relevant concentration of TBOEP (10μg/L) and effects were evaluated at the gene transcription, protein, and life-history (i...
July 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28709031/bisphenol-a-induces-cox-2-through-the-mitogen-activated-protein-kinase-pathway-and-is-associated-with-levels-of-inflammation-related-markers-in-elderly-populations
#12
Heewon Song, Joonwoo Park, Phuong T C Bui, KeunOh Choi, Myung Chan Gye, Yun-Chul Hong, Jin Hee Kim, Young Joo Lee
Bisphenol A (BPA) is a well-known endocrine-disrupting chemical, and it is one of the highest volume chemicals produced worldwide. Even though several in vivo and in vitro studies showed positive associations of BPA exposure with pro-inflammatory cytokines such as tumor necrosis factor-α and interleukin (IL)-6, the mechanism by which BPA induces inflammation is unclear. We investigated the mechanism by which BPA induces inflammation (expression of inflammation-related genes, changes in oxidative stress, and cell proliferation and migration) and evaluated the effect of BPA exposure on inflammation-related markers in epidemiologic studies using repeat urine and serum samples from elderly subjects...
July 11, 2017: Environmental Research
https://www.readbyqxmd.com/read/28707677/-omics-and-endocrine-disrupting-chemicals-new-paths-forward
#13
REVIEW
Carmen Messerlian, Rosie M Martinez, Russ Hauser, Andrea A Baccarelli
The emerging field of omics - large-scale data-rich biological measurements of the genome - provides new opportunities to advance and strengthen research into endocrine-disrupting chemicals (EDCs). Although some EDCs have been associated with adverse health effects in humans, our understanding of their impact remains incomplete. Progress in the field has been primarily limited by our inability to adequately estimate and characterize exposure and identify sensitive and measurable outcomes during windows of vulnerability...
July 14, 2017: Nature Reviews. Endocrinology
https://www.readbyqxmd.com/read/28707244/cytotoxic-effects-of-seven-tunisian-hospital-wastewaters-on-the-proliferation-of-human-breast-cancer-cell-line-mda-231-correlation-with-their-chemical-characterization
#14
Emna Nasri, Monia Machreki, Asma Beltifa, Sonia Aroui, Asma Ghorbel, Amina Saad, Anouar Feriani, Mohamed Ali Borgi, Lakhdar Ghazouani, Olivier Sire, José Luis Balcázar, Hedi Ben Mansour
Hospital wastewaters contain large amounts of pharmaceutical residues, which may eventually be discharged into the aquatic environment through wastewater treatment plants, raising the question of their impact on human and environmental health. This has prompted the launch of several monitoring studies into the most commonly administered compounds in urban wastewater. The aim of this study was, therefore, to explore the cytotoxic potential of wastewaters samples collected from seven hospitals in Tunisia. The physicochemical analyses showed a large fluctuation of certain parameters in the collected samples, such as chemical oxygen demand (ranged from 860 to 1720 mg L(-1)), biochemical oxygen demand (ranged from 385 to 747 mg L(-1)), total organic carbon (ranged from 256 to 562 g L(-1)), total suspended solids (ranged from 905 to 1450 mg L(-1)), conductivity (ranged from 3...
July 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28697429/bisphenol-a-disrupts-steroidogenesis-and-induces-a-sex-hormone-imbalance-through-c-jun-phosphorylation-in-leydig-cells
#15
Hsin-Chieh Lan, Kai-Yu Wu, I-Wen Lin, Zhi-Jie Yang, Ai-An Chang, Meng-Chun Hu
Bisphenol A (BPA) is a well-known endocrine disrupting chemical (EDC) that is used to manufacture plastic consumer products. It is well known that exposure to BPA can induce defects in gonad development and negatively influences reproductive function in both males and females. In this study, we assessed the effects of BPA on hormone production in Leydig cells, which secrete hormones in the testes and support male fertility. We examined two steroidogenic enzymes, CYP11A1 and CYP19 that involved in sex hormone synthesis in mouse MA-10 Leydig cells...
July 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28689058/protective-effect-of-crocin-on-bpa-induced-liver-toxicity-in-rats-through-inhibition-of-oxidative-stress-and-downregulation-of-mapk-and-mapkap-signaling-pathway-and-mirna-122-expression
#16
Faezeh Vahdati Hassani, Soghra Mehri, Khalil Abnous, Ruth Birner-Gruenberger, Hossein Hosseinzadeh
Bisphenol A (BPA) is an artificial environmental endocrine disrupting chemical and commonly used as a monomer of polycarbonate plastics and epoxy resins. The aim of the present study is to investigate the hepatoprotective effects of crocin, a constituent of saffron, against BPA-induced liver toxicity. We showed that treatment of male Wistar rats with 0.5 mg/kg BPA for 30 days increased the level of 8-isoprostane, decreased the level of reduced glutathione, elevated serum levels of aspartate aminotransferase, lactate dehydrogenase, triglyceride, and glucose, and induced periportal inflammation...
July 6, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28686624/adverse-effects-of-chronic-exposure-to-nonylphenol-on-non-alcoholic-fatty-liver-disease-in-male-rats
#17
Jie Yu, Xuesong Yang, Ya Luo, Xuefeng Yang, Mengxue Yang, Jin Yang, Jie Zhou, Feng Gao, Liting He, Jie Xu
Endocrine-disrupting chemical (EDC) has been thought to play a role in non-alcoholic fatty liver disease (NAFLD). However, the toxic effects of Nonylphenol (NP), an EDC, on non-alcoholic fatty liver disease have never been elaborated. This study aimed to investigate whether exposure to NP could induce NAFDL, a promoting effect of high-sucrose-high-fat diet (HSHFD) on the adverse effects caused by NP was evaluated. Fourth eight male rats were assigned to four groups and each group was treated with a specific testing sample: normal-diet (ND) control group (C-ND); normal diet plus NP (180mg/kg/day) group (NP-ND); high-sucrose-high-fat-diet control group (C-HSHFD); HSHFD plus NP (180mg/kg/day) group (NP-HSHFD)...
2017: PloS One
https://www.readbyqxmd.com/read/28678591/cypermethrin-inhibits-interleukin-6-induced-androgen-receptor-transactivation-through-signal-transducer-and-activator-of-transcription-3
#18
Ji-Long Zhou, Zhen Ding, Xing Ge, Qiao-Mei Shi, Heng-Xue Wang, Gang Chen, Meng-Xue Li, Hui Wang, Qiang Ju, Qi Wang, Jin-Peng Zhang, Mei-Rong Zhang, Li-Chun Xu
The insecticide cypermethrin has been considered as an endocrine-disrupting chemicals (EDCs) with anti-androgenic activity by interfering with interleukin-6 (IL-6)-induced ligand-independent AR signaling. The purpose of this study was to clarify whether the signal transducer and activator of transcription 3 (STAT3) was involved in the antagonism effect of cypermethrin. In this study, the Western blot was to test the level of STAT3 phosphorylation and the mammalian two-hybrid assay was developed to assess the AR-STAT3 interaction...
July 5, 2017: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/28677244/endocrine-disruption-in-silico-interactions-between-phthalate-plasticizers-and-corticosteroid-binding-globulin
#19
Ishfaq A Sheikh, Mohd A Beg
Endocrine disruption is a phenomenon when a man-made or natural compound interferes with normal hormone function in human or animal body systems. Endocrine-disrupting compounds (EDCs) have assumed considerable importance as a result of industrial activity, mass production of synthetic chemicals and environmental pollution. Phthalate plasticizers are a group of chemicals used widely and diversely in industry especially in the plastic industry, and many of the phthalate compounds have endocrine-disrupting properties...
July 4, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28675057/multiple-receptors-shape-the-estrogen-response-pathway-and-are-critical-considerations-for-the-future-of-in-vitro-based-risk-assessment-efforts
#20
Michelle M Miller, Patrick D McMullen, Melvin E Andersen, Rebecca A Clewell
Current in life toxicity testing paradigms are being challenged as the future of risk assessment moves towards more comprehensive mode of action/adverse outcome pathway based approaches. In particular, endocrine disruption screening is now a global activity and key initiatives in the United States focus on the use of high throughput in vitro assays to prioritize compounds for further testing of estrogen, androgen or thyroid disruption. Of these pathways, much of the emphasis to date has been on high-throughput methods for estrogenic activity primarily using ligand binding and trans-activation assays...
July 4, 2017: Critical Reviews in Toxicology
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