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https://www.readbyqxmd.com/read/28938483/varying-susceptibility-of-the-female-mammary-gland-to-in-utero-windows-of-bpa-exposure
#1
Andrea R Hindman, Xiaokui Molly Mo, Hannah L Helber, Claire E Kovalchin, Nanditha Ravichandran, Alina R Murphy, Abigail M Fagan, Pamela M St John, Craig J Burd
In utero exposure to the endocrine disrupting compound bisphenol A (BPA) is known to disrupt mammary gland development and increase tumor susceptibility in rodents. It is unclear if there are different periods of in utero development that may be more susceptible to BPA exposure. Herein, pregnant CD-1 mice were exposed to BPA at different times during gestation that correspond to specific milestones of in utero mammary gland development. Mammary glands of early-life and adult female mice, exposed in utero to BPA, were morphologically and molecularly (ERα and Ki67) evaluated for developmental abnormalities...
August 9, 2017: Endocrinology
https://www.readbyqxmd.com/read/28938450/sex-specific-modulation-of-fetal-adipogenesis-by-gestational-bisphenol-a-and-bisphenol-s-exposure
#2
Yong Pu, Jeremy Gingrich, Juan P Steibel, Almudena Veiga-Lopez
The endocrine disrupting chemical bisphenol A (BPA) increases adipose tissue mass in vivo and promotes adipogenesis in vitro. However, mechanisms explaining BPA's obesogenic effect remain unknown. We investigated the effects of gestational BPA and its analogue, bisphenol S (BPS), exposure on the adipogenic differentiation ability of fetal preadipocytes and the role of endoplasmic reticulum stress in regulating this process. Pregnant sheep (n=7-8/group) mated to the same male were exposed to BPA or BPS from days 30 to 100 of gestation, and pregnancies terminated 20 days later...
September 14, 2017: Endocrinology
https://www.readbyqxmd.com/read/28937960/prenatal-exposure-to-nonpersistent-endocrine-disruptors-and-behavior-in-boys-at-3-and-5-years
#3
Claire Philippat, Dorothy Nakiwala, Antonia M Calafat, Jérémie Botton, Maria De Agostini, Barbara Heude, Rémy Slama
BACKGROUND: Sex-specific associations have been reported between phthalates, bisphenol A (BPA), and child behavior. No data on large study populations are available for other phenols with possible endocrine-disrupting properties. OBJECTIVES: We aimed to study associations between prenatal exposure to phthalates and several phenols on behavior among male infants. METHODS: We quantified 11 phthalate metabolites and nine phenols (four parabens, benzophenone-3, BPA, two dichlorophenols, triclosan) in spot urine samples collected during pregnancy among EDEN cohort mothers who delivered a boy...
September 15, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28934727/in-utero-exposure-to-select-phenols-and-phthalates-and-respiratory-health-in-five-year-old-boys-a-prospective-study
#4
Céline Vernet, Isabelle Pin, Lise Giorgis-Allemand, Claire Philippat, Meriem Benmerad, Joane Quentin, Antonia M Calafat, Xiaoyun Ye, Isabella Annesi-Maesano, Valérie Siroux, Rémy Slama
BACKGROUND: Phenols and phthalates may have immunomodulatory and proinflammatory effects and thereby adversely affect respiratory health. OBJECTIVE: We estimated the associations between gestational exposure to select phthalates and phenols and respiratory health in boys. METHODS: Among 587 pregnant women from the EDEN (Etude des Déterminants pré et post natals du développement et de la santé de l'Enfant) cohort who delivered a boy, 9 phenols and 11 phthalates metabolites were quantified in spot pregnancy urine samples...
September 8, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28934718/urinary-bpa-and-phthalate-metabolite-concentrations-and-plasma-vitamin-d-levels-in-pregnant-women-a-repeated-measures-analysis
#5
Lauren E Johns, Kelly K Ferguson, David E Cantonwine, Thomas F McElrath, Bhramar Mukherjee, John D Meeker
BACKGROUND: In addition to its well-established role in maintaining skeletal health, vitamin D has essential regulatory functions in female reproductive and pregnancy outcomes. Phthalates and bisphenol A (BPA) are endocrine disruptors, and previous research has suggested that these chemical agents may disrupt circulating levels of total 25(OH)D in adults. OBJECTIVES: We investigated the relationships between repeated measures of urinary phthalate metabolites and BPA and circulating total 25(OH)D in a prospective cohort of pregnant women...
August 31, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28934651/persulfate-enhanced-photocatalytic-degradation-of-bisphenol-a-by-g-c3n4-nanosheets-under-visible-light-irradiation
#6
Bochuan Liu, Meng Qiao, Yanbin Wang, Lijuan Wang, Yan Gong, Tao Guo, Xu Zhao
The enhancement of g-C3N4 photocatalytic degradation of bisphenol A (BPA) via persulfate (PS) addition was investigated under visible light irradiation. The effects of various parameters on the BPA degradation were investigated, such as catalysts dosage, PS concentrations, initial pH value and BPA concentration. The results showed that g-C3N4 nanosheets exhibited superior photocatalytic activity toward BPA degradation as compared with bulk g-C3N4. The addition of PS can further improve the g-C3N4 photocatalytic performance for BPA degradation...
September 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28934011/solid-phase-extraction-of-large-volume-of-water-and-beverage-samples-to-improve-detection-limits-for-gc-ms-analysis-of-bisphenol-a-and-four-other-bisphenols
#7
Xu-Liang Cao, Svetlana Popovic
Solid phase extraction (SPE) of large volumes of water and beverage products was investigated for the GC-MS analysis of bisphenol A (BPA), bisphenol AF (BPAF), bisphenol F (BPF), bisphenol E (BPE), and bisphenol B (BPB). While absolute recoveries of the method were improved for water and some beverage products (e.g., diet cola, iced tea), breakthrough may also have occurred during SPE of 200 mL of other beverages (e.g., BPF in cola). Improvements in method detection limits were observed with the analysis of large sample volumes for all bisphenols at ppt (pg/g) to sub-ppt levels...
September 21, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28929379/erratum-to-anatomical-specificity-of-the-brain-in-the-modulation-of-neuroglobin-and-cytoglobin-genes-after-chronic-bisphenol-a-exposure
#8
Rodrigo Rodrigues da Conceição, Janaina Sena de Souza, Kelen Carneiro de Oliveira, Rui Monteiro de Barros Maciel, Marco Aurélio Romano, Renata Marino Romano, Magnus Régios Dias da Silva, Maria Izabel Chiamolera, Gisele Giannocco
No abstract text is available yet for this article.
September 20, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28929288/complex-organic-pollutant-mixtures-originating-from-industrial-and-municipal-emissions-in-surface-waters-of-the-megacity-jakarta-an-example-of-a-water-pollution-problem-in-emerging-economies
#9
Larissa Dsikowitzky, Lukas Hagemann, Dwiyitno, Farida Ariyani, Hari Eko Irianto, Jan Schwarzbauer
During the last decades, the global industrial production partly shifted from industrialized nations to emerging and developing countries. In these upcoming economies, the newly developed industrial centers are generally located in densely populated areas, resulting in the discharge of often only partially treated industrial and municipal wastewaters into the surface waters. There is a huge gap of knowledge about the composition of the complex organic pollutant mixtures occurring in such heavily impacted areas...
September 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28929027/the-role-of-polycarbonate-monomer-bisphenol-a-in-insulin-resistance
#10
Milos Pjanic
Bisphenol A (BPA) is a synthetic unit of polycarbonate polymers and epoxy resins, the types of plastics that could be found in essentially every human population and incorporated into almost every aspect of the modern human society. BPA polymers appear in a wide range of products, from liquid storages (plastic bottles, can and glass linings, water pipes and tanks) and food storages (plastics wraps and containers), to medical and dental devices. BPA polymers could be hydrolyzed spontaneously or in a photo- or temperature-catalyzed process, providing widespread environmental distribution and chronic exposure to the BPA monomer in contemporary human populations...
2017: PeerJ
https://www.readbyqxmd.com/read/28928807/effects-of-low-dose-of-bisphenol-a-on-the-proliferation-and-mechanism-of-primary-cultured-prostate-epithelial-cells-in-rodents
#11
Dongyan Huang, Jianhui Wu, Xin Su, Han Yan, Zuyue Sun
Bisphenol A (BPA) is a well-known endocrine disruptor compound (EDC) that aggravates testosterone-induced benign prostate hyperplasia by increasing the relative weight of the ventral and dorsolateral prostate in rats. This phenomenon is primarily attributed to the exogenous estrogen effect of BPA. However, the direct effect of BPA on prostate cells has not been characterized. The present study investigated the proliferative effect and possible mechanisms of action of BPA on the prostatic epithelium of rats...
September 2017: Oncology Letters
https://www.readbyqxmd.com/read/28928476/bisphenol-a-affects-on-the-functional-properties-and-proteome-of-testicular-germ-cells-and-spermatogonial-stem-cells-in-vitro-culture-model
#12
Polash Chandra Karmakar, Hyun-Gu Kang, Yong-Hee Kim, Sang-Eun Jung, Md Saidur Rahman, Hee-Seok Lee, Young-Hyun Kim, Myung-Geol Pang, Buom-Yong Ryu
The endocrine disruptor bisphenol A (BPA) is well known for its adverse effect on male fertility. Growing evidence suggests that BPA may interact with testicular germ cells and cause infertility as a result of its estrogenic activity. Objective of current in vitro study was to investigate the proliferation, survivability and stemness properties of mouse testicular germ cells exposed to BPA, and to evaluate possible expression of cellular proteome. Our results showed that germ cell viability and proliferation were not affected by low concentrations (0...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28927721/agonistic-effects-of-diverse-xenobiotics-on-the-constitutive-androstane-receptor-as-detected-in-a-recombinant-yeast-cell-assay
#13
Ryo Kamata, Daisuke Nakajima, Fujio Shiraishi
The constitutive androstane receptor (CAR) is a nuclear receptor and transcription factor regulating proteins involved in xenobiotic metabolism. Agonist activation of the CAR can trigger metabolic activation and toxification as well as detoxification and clearance; accordingly, xenobiotic substances acting as CAR ligands may pose a threat to human and animal health. We used yeast cells transduced with the human CAR and the response pathway to measure the CAR-agonistic activities of 549 synthetic or natural compounds: 216 of the tested compounds exhibited CAR-agonistic effects...
September 16, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28924161/molecular-mechanisms-involved-in-the-non-monotonic-effect-of-bisphenol-a-on-ca2-entry-in-mouse-pancreatic-%C3%AE-cells
#14
Sabrina Villar-Pazos, Juan Martinez-Pinna, Manuel Castellano-Muñoz, Paloma Alonso-Magdalena, Laura Marroqui, Ivan Quesada, Jan-Ake Gustafsson, Angel Nadal
In regulatory toxicology, the dose-response relationship is a key element towards fulfilling safety assessments and satisfying regulatory authorities. Conventionally, the larger the dose, the greater the response, following the dogma "the dose makes the poison". Many endocrine disrupting chemicals, including bisphenol-A (BPA), induce non-monotonic dose response (NMDR) relationships, which are unconventional and have tremendous implications in risk assessment. Although several molecular mechanisms have been proposed to explain NMDR relationships, they are largely undemonstrated...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28917817/mechanistic-insight-into-degradation-of-endocrine-disrupting-chemical-by-hydroxyl-radical-an-experimental-and-theoretical-approach
#15
Ruiyang Xiao, Lingwei Gao, Zongsu Wei, Richard Spinney, Shuang Luo, Donghong Wang, Dionysios D Dionysiou, Chong-Jian Tang, Weichun Yang
Advanced oxidation processes (AOPs) based on formation of free radicals at ambient temperature and pressure are effective for treating endocrine disrupting chemicals (EDCs) in waters. In this study, we systematically investigated the degradation kinetics of bisphenol A (BPA), a representative EDC by hydroxyl radical (OH) with a combination of experimental and theoretical approaches. The second-order rate constant (k) of BPA with OH was experimentally determined to be 7.2 ± 0.34 × 10(9) M(-1) s(-1) at pH 7...
September 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28917796/simultaneous-phase-inversion-and-imprinting-based-sensor-for-highly-sensitive-and-selective-detection-of-bisphenol-a
#16
Qian Yang, Xiaqing Wu, Hailong Peng, Longwen Fu, Xingliang Song, Jinhua Li, Hua Xiong, Lingxin Chen
A novel recognition element of molecularly imprinted films (MIFs) was synthesized by wet phase inversion (WPI) on the surface of Ti/TiO2 electrode for highly selective and sensitive electrochemical detection of bisphenol A (BPA). The Ti/TiO2/MIFs sensor was constructed by casting the precursor poly(acrylonitrile-co-acrylic acid) (p(AN-co-AA)) in dimethyl sulfoxide containing template molecule BPA onto the electrode and then immersing into water, resulting in simultaneous p(AN-co-AA) precipitation and BPA imprinting via the facile WPI...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917200/improved-visible-light-activities-for-degrading-pollutants-on-tio2-g-c3n4-nanocomposites-by-decorating-spr-au-nanoparticles-and-2-4-dichlorophenol-decomposition-path
#17
Amir Zada, Yang Qu, Sharafat Ali, Ning Sun, Hongwei Lu, Rui Yan, Xuliang Zhang, Liqiang Jing
It has been clearly demonstrated that the visible-light photocatalytic activities of g-C3N4 (CN) for degrading 2,4-dichlorophenol (2,4-DCP) and bisphenol A (BPA) could be improved by fabricating nanocomposites with a proper amount of nanocrystalline anatase TiO2. Interestingly, the visible-light activities of the amount-optimized nanocomposite could be further improved after decorating Au nanoparticles, with 5.11- and 3.1-time improvement respectively for 2,4-DCP and BPA compared to that of CN, even much higher than that of P25 TiO2 under UV-vis irradiation...
September 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28916285/profiling-of-bisphenol-s-towards-nuclear-receptors-activities-in-human-reporter-cell-lines
#18
Ondrej Zenata, Zdenek Dvorak, Radim Vrzal
Bisphenol S (BPS) is heat-stable structural analog of bisphenol A (BPA), a known endocrine disruptor. Due to the effort to replace BPA with BPS, it is essential to know if BPS is suitable non-toxic replacement without reported deleterious effects of BPA. Since most of the BPA effects are ascribed to its ability to activate nuclear receptors, we screened some prominent members of this family in order to confirm or refute some recent findings. We found that BPS insignificantly activated aryl hydrocarbon receptor (AhR) in reporter gene assay and no induction of AhR target gene CYP1A1 was observed in human hepatocytes (HH)...
September 12, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28915054/rapid-removal-and-mineralization-of-bisphenol-a-by-heterosupramolecular-plasmonic-photocatalyst-consisting-of-gold-nanoparticle-loaded-titanium-iv-oxide-and-surfactant-admicelle
#19
Shin-Ichi Naya, Junpei Yamauchi, Takashi Okubo, Hiroaki Tada
The establishment of the technology for rapidly and completely remove and mineralize harmful phenolic compounds from water is of great importance for environmental conservation. Visible-light irradiation ( > 430 nm, light intensity integrated from 420 to 485 nm = 6.0 mW cm-2) of Au nanoparticle (NP)-loaded TiO2 (Au/TiO2) in dilute aqueous solutions of bisphenol A (BPA) and p-cresol (PC) causes degradation of the phenols. The addition of trimethylstearylammonium chloride (C18TAC) enhances the adsorption of BPA on Au/TiO2 to greatly increase the rate of reaction...
September 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28910977/bisphenol-a-induced-apoptosis-and-transcriptome-differences-of-spermatogonial-stem-cells-in-vitro
#20
Xiaowen Gong, Hui Xie, Xiaoyong Li, Ji Wu, Yi Lin
Bisphenol A (BPA) is widely used as an industrial plasticizer, which is also an endocrine disruptor and considered to have adverse effects on reproduction. In male mammals, the long-term production of billions of spermatozoa relies on the regulated proliferation and differentiation of spermatogonial stem cells (SSCs). However, little is known about the effects of BPA on the viability of SSCs. To investigate the influence of BPA exposure on SSCs in vitro, we isolated SSCs from mouse and successfully established in vitro propagation of SSCs...
September 1, 2017: Acta Biochimica et Biophysica Sinica
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