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Xenoestrogens

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https://www.readbyqxmd.com/read/28735517/metallothionein-expression-and-synthesis-in-the-testis-of-the-lizard-podarcis-sicula-under-natural-conditions-and-following-estrogenic-exposure
#1
Mariailaria Verderame, Ermelinda Limatola, Rosaria Scudiero
Metallothionein (MT) is the main protein involved in the homeostasis of metallic micronutrients and in cellular defence against heavy metals and reactive oxygen species. Found in almost all vertebrate tissues, MT presence and localization in the testis has been controversial. In the present study, by using in situ hybridization and immunohistochemical analysis we assessed the localization of both MT transcript and protein in Podarcis sicula testes during two different phases of the reproductive cycle: the autumnal resumption and the spring-early summer mating period...
May 3, 2017: European Journal of Histochemistry: EJH
https://www.readbyqxmd.com/read/28717100/inhibitory-modulation-of-human-estrogen-receptor-%C3%AE-and-%C3%AE-activities-by-dicyclohexyl-phthalate-in-human-breast-cancer-cell-lines
#2
Hiroyuki Okazaki, Shuso Takeda, Saki Matsuo, Masaya Matsumoto, Erika Furuta, Eriko Kohro-Ikeda, Hironori Aramaki
Phthalate esters (PAEs) are man-made compounds that are used widely in industry, and the ubiquitous exposure of humans to PAEs has been reported. Although some PAEs have been suggested to function as xenoestrogens in in vitro systems, such as human estrogen receptors (ERs) expressed in Chinese hamster ovary (CHO)-K1 cells, few studies have attempted to elucidate whether PAEs affect human ERα/ERβ-mediated signaling in human breast cancer cells (i.e., combination between human ERs and human cells). Thus, further experiments are needed in order to clarify the activities of PAEs...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28710737/effect-of-rice-straw-biochar-on-selective-biodegradation-of-nonylphenols-in-isomer-specificity
#3
Lingdan Yao, Lixiao Wang, Guanghuan Cheng, Qian Huang, Baolan Hu, Jingrang Lu, Liping Lou
In a previous study, we found that rice-straw biochar degraded and removed hydrophobic organic contaminants (HOCs) through coupled adsorption-biodegradation. However, few studies have determined whether biochar affects HOC isomer degradation and isomer-selective biodegradation or whether biochar can alter HOC isomer features, resulting in changes to HOC isomer residues in water environments. In this study, the effects of biochar at two dosages (0.001 and 0.01 g) on the biodegradation of ten isomers of a typical xenoestrogen of nonylphenol (NP) were evaluated...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28703301/the-xenoestrogens-biphenol-a-and-nonylphenol-differentially-regulate-metalloprotease-mediated-shedding-of-egfr-ligands
#4
Paulina Urriola-Muñoz, Xue Li, Thorsten Maretzky, David R McIlwain, Tak W Mak, Juan G Reyes, Carl P Blobel, Ricardo D Moreno
The xenoestrogens Bisphenol-A (BPA) and Nonylphenol (NP) are endocrine disruptors used in the plastic polymer industry to manufacture different products for human use. Previous studies have suggested a role of these compounds in the shedding of signaling molecules, such as tumor necrosis factor α (TNF- α). The aim of this work was to evaluate the effect of BPA and NP on the sheddase ADAM17 and its newly discovered regulators iRhom1 and iRhom2 in the release of EGFR-ligands. We report that BPA and NP can stimulate the release of the ADAM17-substrates HB-EGF and TGF- α...
July 13, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28622991/transcription-of-ribogenesis-genes-in-fish-gonads-applications-in-the-identification-of-stages-of-oogenesis-and-in-environmental-monitoring-of-intersex-condition
#5
Iratxe Rojo-Bartolomé, Ainara Valencia, Ibon Cancio
One of the best described effects of environmental xenoestrogens in fish is the generation of intersex gonads in males. Considering 5S rRNA a marker of the presence of oocytes, a 5S/18S rRNA index was calculated in 296 thicklip grey mullets (Chelon labrosus) from polluted environments. In addition, qPCR analysis of transcription factors gtf3a and ubtf1, related respectively to 5S and 18S rRNA synthesis, was conducted along female-oogenesis. 5S/18S rRNA index identified sex with a threshold value of 0.4521 separating males from females...
June 13, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28549265/facile-screening-of-potential-xenoestrogens-by-an-estrogen-receptor-based-reusable-optical-biosensor
#6
Lanhua Liu, Xiaohong Zhou, Yun Lu, Didi Shan, Bi Xu, Miao He, Hanchang Shi, Yi Qian
The apparent increase in hormone-induced cancers and disorders of the reproductive tract has led to a growing demand for new technologies capable of screening xenoestrogens. We reported an estrogen receptor (ER)-based reusable fiber biosensor for facile screening estrogenic compounds in environment. The bioassay is based on the competition of xenoestrogens with 17β-estradiol (E2) for binding to the recombinant receptor of human estrogen receptor α (hERα) protein, leaving E2 free to bind to fluorophore-labeled anti-E2 monoclonal antibody...
May 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28521190/simultaneous-determination-of-bisphenol-a-and-estrogens-in-hair-samples-by-liquid-chromatography-electrospray-tandem-mass-spectrometry
#7
Chaelin Lee, Chong Hyeak Kim, Sunghwan Kim, Sung-Hee Cho
Bisphenol A (BPA), an endocrine disrupter, is widely used to make chemicals for polycarbonate, plastics, beverage containers, epoxy resins, and cash register receipts. BPA is one of the known xenoestrogens, which have weak estrogenic activity and cause obesity, diabetes, breast cancer, and reproductive disorders. Even though the concentration level of metabolomes in hair is usually lower than that in urine and blood, there are several reasons why we chose to use hair samples. First, the sampling procedure of hairs is simple...
May 11, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28463702/monitoring-of-bisphenol-a-and-bisphenol-s-in-thermal-paper-receipts-from-the-italian-market-and-estimated-transdermal-human-intake-a-pilot-study
#8
Giacomo Russo, Francesco Barbato, Lucia Grumetto
Bisphenol A (BPA), a synthetic xenoestrogen widely used in various industrial fields, can be present, in its un-reacted form, as an additive in thermal paper. BPA is virtually ubiquitous in industrialized societies and humans are exposed to this chemical via dietary and non-dietary sources. Since in 2015 European Food Safety Authority (EFSA) indicated that thermal paper is the second source of BPA exposure after the food chain, some suppliers replaced BPA with its analogue Bisphenol S (BPS), speculatively supposed to be safer...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448746/pharmaceutical-chemicals-steroids-and-xenoestrogens-in-water-sediments-and-fish-from-the-tidal-freshwater-potomac-river-virginia-usa
#9
Golala Arya, Sara Tadayon, James Sadighian, Jennifer Jones, Kim de Mutsert, Thomas B Huff, Gregory D Foster
Selected pharmaceutical chemicals, steroids and xenoestrogens (PCSXs) consisting of 29 endocrine modulators, therapeutic drugs, pesticides, detergents, plastics, and active ingredients in household products were measured in water, riverbed sediments and fish collected in a tributary embayment of the Potomac River (Hunting Creek, Alexandria, VA, USA) in the vicinity of wastewater discharge. A total of 17 PCSXs were found in the Hunting Creek samples, with steroid hormones (e.g., progesterone and 17α-ethinylestradiol), triclosan, dextromethorphan and bisphenol A being the most prominent micropollutants detected...
April 27, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28446726/low-concentration-of-bpa-induces-mice-spermatocytes-apoptosis-via-gpr30
#10
Chaoliang Wang, Jianxiang Zhang, Qi Li, Tianbiao Zhang, Zishi Deng, Jing Lian, Donghui Jia, Rui Li, Tao Zheng, Xiaoju Ding, Fan Yang, Chao Ma, Rui Wang, Weixing Zhang, Jian Guo Wen
Bisphenol A (BPA) acts as xenoestrogen and has a great impact on disorders of human reproductive system. However, the mechanism through which BPA can affect human testicular function remains to be indentified. GPR30 is a novel membrane estrogen receptor with high-affinity and low-capacity binding to estrogens. We demonstrated that estrogen receptor α (ERα), estrogen receptor β (ERβ) as well as GPR30 are expressed in mouse spermatocyte-derived GC-2 cells using Real-time PCR. We treated the cells with different doses of BPA and found that even low doses of BPA can inhibit GC-2 cell growth using MTT assay...
April 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/28411469/primary-hepatocytes-from-arctic-char-salvelinus-alpinus-as-a-relevant-arctic-in-vitro-model-for-screening-contaminants-and-environmental-extracts
#11
Karina Petersen, Maria T Hultman, Knut Erik Tollefsen
Contaminants find their way to the Arctic through long-range atmospheric transport, transport via ocean currents, and through increased anthropogenic activity. Some of the typical pollutants reaching the Arctic (PAHs, PCBs) are known to induce cytochrome P450 1a (CYP1A) protein expression and ethoxyresorufin-O-deethylase (EROD) activity through the aryl hydrocarbon receptor (AhR). In addition, some endocrine disrupting chemicals (EDCs) such as estrogen mimics (xenoestrogens) have been documented in Arctic areas and they may interfere with natural sexual development and reproduction...
June 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28318602/metals-hormones-and-sexual-maturation-in-flemish-adolescents-in-three-cross-sectional-studies-2002-2015
#12
Sam De Craemer, Kim Croes, Nicolas van Larebeke, Stefaan De Henauw, Greet Schoeters, Eva Govarts, Ilse Loots, Tim Nawrot, Vera Nelen, Elly Den Hond, Liesbeth Bruckers, Yue Gao, Willy Baeyens
Sex hormone levels and timing of sexual maturation are considered important markers for health status of adolescents in puberty, and previous research suggests they might be influenced by metal exposure. In three campaigns of the Flemish Environment and Health Study (FLEHS I 2002-2006; FLEHS II 2007-2011 and FLEHS III 2012-2015), data were collected on internal exposure to metals (Cd, Cu, Pb, Cr, Mn, Tl, Ni, Sb, Hg, As and As species) and sexual maturation in 2671 14-15years old adolescents. All metals were measured in blood and/or urine, except total- and methylmercury which were measured in hair samples...
March 17, 2017: Environment International
https://www.readbyqxmd.com/read/28288811/changes-in-the-total-effective-xenoestrogen-burden-texb-of-breast-cancer-patients-during-an-18-month-post-surgical-follow-up
#13
Mariana F Fernandez, Jose Pumarega, Miquel Porta, Jose Manuel Molina-Molina, Juan P Arrebola, Nicolas Olea
We aimed to assess changes in the total effective xenoestrogen burden (TEXB) -a biomarker of combined effect of mixtures of xenoestrogens- in breast cancer patients at surgery (breast adipose tissue) and at different time points during an 18-month follow-up (abdominal adipose tissue), and to analyze the potential influence of socio-demographic, reproductive, tumor, and treatment characteristics on TEXB levels. TEXB-alpha (due to persistent organohalogenated chemicals) and TEXB-beta (due mainly to endogenous estrogens) were quantified in 44 women...
March 10, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28285354/endocrine-disruption-oxidative-stress-and-testicular-damage-induced-by-4-nonylphenol-in-clarias-gariepinus-the-protective-role-of-cydonia-oblonga
#14
Alaa El-Din H Sayed, Rania F K Ismail
Exposure to xenoestrogens like 4-nonylphenol (NP) is recognized by disrupting endocrine functions and causes reproductive dysfunction in male fish. The present study aimed at investigating the 4-nonylphenol propensity to induce oxidative stress and hormonal disturbances in male catfish and at studying the protective role of quince (Cydonia oblonga). To fulfill this aim, catfish Clarias gariepinus were exposed to pure 100 μg/L 4-NP and to quince the leaf extract added to 4-NP, both for 15 days. The 4-NP exposure induced a marked increase in 17ß-estradiol (E2), LH, and cortisol, while thyroid hormone (TSH, T3), testosterone (T), and FSH levels noticeably decreased; however, 4-NP had no effect on T4 level...
August 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28279175/the-mouse-mammary-gland-as-a-sentinel-organ-distinguishing-control-populations-with-diverse-environmental-histories
#15
SriDurgaDevi Kolla, Aastha Pokharel, Laura N Vandenberg
BACKGROUND: There are numerous examples of laboratory animals that were inadvertently exposed to endocrine disrupting chemicals (EDCs) during the process of conducting experiments. Controlling contaminations in the laboratory is challenging, especially when their source is unknown. Unfortunately, EDC contaminations can interfere with the interpretation of data during toxicological evaluations. We propose that the male CD-1 mouse mammary gland is a sensitive bioassay to evaluate the inadvertent contamination of animal colonies...
March 9, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28263720/simvastatin-down-regulates-differential-genetic-profiles-produced-by-organochlorine-mixtures-in-primary-breast-cell-hmec
#16
LETTER
Javier Rivero, Luis Alberto Henríquez-Hernández, Luis D Boada, Jose Pestano, Octavio P Luzardo, María Camacho, Manuel Zumbado, Pilar F Valerón
Women all over the world are exposed to an unavoidable contamination by organochlorine pesticides and other chemical pollutants. Many of them are considered as xenoestrogens and have been associated with the development and progression of breast cancer. We have demonstrated that the most prevalent pesticide mixtures found in healthy women and in women diagnosed with breast cancer modulates the gene expression in human epithelial mammary cells. Statins are well-known cholesterol-depleting agents acting as inhibitors of cholesterol synthesis...
April 25, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28231547/nonmonotonic-responses-to-low-doses-of-xenoestrogens-a-review
#17
REVIEW
Zhixiang Xu, Jun Liu, Xinhao Wu, Bin Huang, Xuejun Pan
Xenoestrogens (XEs) mimic or block the synthesis, metabolism and transport of normal endogenous hormones, disturbing normal endocrine function. The available data on the nonmonotonic estrogenic effects of low doses of many XEs are reviewed, covering in vitro, in vivo and epidemiological studies. The observed nonmonotonic patterns of the dose-response curves are discussed, along with possible underlying mechanisms. This review is intended to provide guidance for harm predication and to suggest prevention measures...
May 2017: Environmental Research
https://www.readbyqxmd.com/read/28208728/parabens-accelerate-ovarian-dysfunction-in-a-4-vinylcyclohexene-diepoxide-induced-ovarian-failure-model
#18
Jae-Hwan Lee, Myeongho Lee, Changhwan Ahn, Hee Young Kang, Dinh Nam Tran, Eui-Bae Jeung
Parabens are widely used preservatives in basic necessities such as cosmetic and pharmaceutical products. In previous studies, xenoestrogenic actions of parabens were reported in an immature rat model and a rat pituitary cell line (GH3 cells). The relationship between parabens and ovarian failure has not been described. In the present study, the influence of parabens on ovarian folliculogenesis and steroidogenesis was investigated. A disruptor of ovarian small pre-antral follicles, 4-vinylcyclohexene diepoxide (VCD, 40 mg/kg), was used to induce premature ovarian failure (POF)...
February 8, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28181406/endocrine-disrupting-effects-of-methylparaben-on-the-adult-gerbil-prostate
#19
Janaína R Costa, Mônica S Campos, Rodrigo F Lima, Liana S Gomes, Mara R Marques, Sebastião R Taboga, Manoel F Biancardi, Pedro V A Brito, Fernanda C A Santos
Parabens are xenoestrogens widely employed in cosmetics, foodstuffs, and pharmaceutical products. These chemicals are known to disrupt hormone-dependent organs, due to their binding affinity for hormonal receptors. Although recent studies have evaluated the endocrine-disrupting potential of parabens in several reproductive organs, few have investigated the effects of these chemicals in the prostate. The aim of this work was to evaluate the effects of oral exposure to methylparaben (500 mg/kg/day) for 3, 7, and 21 days on male and female adult gerbil prostate...
June 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28153594/dose-dependent-effect-of-bisphenol-a-on-insulin-signaling-molecules-in-cardiac-muscle-of-adult-male-rat
#20
Preethi Sivashanmugam, Vigneswari Mullainadhan, Balasubramanian Karundevi
Environmental contaminant, Bisphenol-A (BPA) is a xenoestrogen, an essential component used for the production of two classes of polymers such as polycarbonate and epoxy resin which disrupts the normal endocrine function. BPA has intense effects on mice endocrine pancreas, an essential tissue involved in glucose metabolism. It disrupts pancreatic β-cell insulin content, induces hyperinsulinemia and insulin resistance in male rats. Cardiac muscle is an insulin responsive organ and insulin has direct effects on glucose transport...
March 25, 2017: Chemico-biological Interactions
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