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https://www.readbyqxmd.com/read/28426879/acute-exposure-to-dehp-metabolite-mehp-cause-genotoxicity-mutagenesis-and-carcinogenicity-in-mammalian-chinese-hamster-ovary-cells
#1
Yu-Jung Chang, Chia-Yi Tseng, Pei-Ying Lin, Yu-Chen Chuang, Ming-Wei Chao
Di-(2-ethylhexyl) phthalate (DEHP), the common plasticizer used in the production of polyvinyl chloride, can be converted to the more potent metabolite mono-ethylhexyl phthalate (MEHP). Epidemiological studies have shown an association with elevated induction of rat hepatic cancer and reproductive toxicity in response to MEHP exposure. However, the mechanism of genotoxicity and carcinogenicity induced by MEHP treatment remains unclear. As a means to elucidate the mechanisms of action, lethality and mutagenicity in the adenine phosphoribosyltransferase (aprt+/-) gene induced in several CHO cell types by MEHP were assessed...
March 1, 2017: Carcinogenesis
https://www.readbyqxmd.com/read/28426647/association-of-prenatal-urinary-phthalate-metabolite-concentrations-and-childhood-bmi-and-obesity
#2
Kim G Harley, Kimberly Berger, Stephen Rauch, Katherine Kogut, Birgit Claus Henn, Antonia M Calafat, Karen Huen, Brenda Eskenazi, Nina Holland
BACKGROUND: Although experiments in animals suggest phthalates may have obesogenic effects, studies of prenatal exposure in children show inconsistent results. METHODS: We measured urinary concentrations of 11 phthalate metabolites collected twice during pregnancy from mothers in the Center for the Health Assessment of Mothers and Children of Salinas (CHAMACOS) cohort study (N=345). Height, weight, waist circumference, and percent body fat were assessed in their children between 5 and 12 years of age...
April 20, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28416457/mono-2-ethylhexyl-phthalate-inhibits-human-extravillous-trophoblast-invasion-via-the-ppar%C3%AE-pathway
#3
Fumei Gao, Wenxin Hu, Yu Li, Huan Shen, Jianying Hu
Concerns over the adverse reproductive outcomes in human have been raised, more evidence including the underlying mechanism are required. Since extravillous trophoblast (EVT) invasion is an important physiological step during early development, the effects of mono-2-ethylhexyl phthalate (MEHP), the bioactive metabolite of DEHP, on EVT invasion were investigated using Matrigel-coated transwell chambers and cell line HTR-8/SVneo. In the transwell-based invasive assay, MEHP exposure inhibited EVT invasion as judged by decreased invasion index...
April 14, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28416218/dummy-molecularly-imprinted-microbeads-as-solid-phase-extraction-material-for-selective-determination-of-phthalate-esters-in-water
#4
Elif Tümay Özer, Bilgen Osman, Tuğçe Yazıcı
The aim of this study was to investigate the usability of newly synthesized dummy molecularly imprinted microbeads (DMIMs) as a solid phase extraction (SPE) material to determine six phthalate esters (PEs) in water by GC-MS analysis. Diethyl phthalate (DEP) was used as a dummy template to prepare poly(ethylene glycol dimethacrylate N-methacryloyl-l-tryptophan methyl ester) [PEMATrp)] DMIMs by using suspension polymerization. The PEMATrp DMIMs were characterized by using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM)...
April 9, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28414217/selection-of-group-specific-pae-binding-dna-aptamers-via-rational-designed-target-immobilization-and-applications-for-ultrasensitive-and-highly-selective-detection-of-paes
#5
Yu Han, Donglin Diao, Zhangwei Lu, Xiaoning Li, Qian Guo, Yumeng Huo, Qing Xu, Youshan Li, Sheng-Li Cao, Jianchun Wang, Yuan Wang, Jiaxing Zhao, Zhongfeng Li, Miao He, Zhaofeng Luo, Xinhui Lou
Phthalic acid esters(PAEs) are ubiquitous in the environment and some of them are recognized as endocrine disruptors that cause concerns on ecosystem functioning and public health. Due to the diversity of PAEs in the environment, there is a vital need to detect the total concentration of PAEs in a timely and low-cost way. To fulfill this requirement, it is highly desired to obtain group-specific PAE binders that are specific to the basic PAE skeleton. In this study, for the first time we have identified the group-specific PAE-binding aptamers via rational designed target immobilization...
April 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28413083/a-novel-nuclear-xenobiotic-receptors-ahr-pxr-car-mediated-mechanism-of-dehp-induced-cerebellar-toxicity-in-quails-coturnix-japonica-via-disrupting-cyp-enzyme-system-homeostasis
#6
Zheng-Hai Du, Jun Xia, Xiao-Chen Sun, Xue-Nan Li, Cong Zhang, Hua-Shan Zhao, Shi-Yong Zhu, Jin-Long Li
Di-(2-ethylhexyl)-phthalate (DEHP) is causing serious health hazard in wildlife animal and human through environment and food chain, including the effect of brain development and impacted neurobehavioral outcomes. However, DEHP exposure caused cerebellar toxicity in bird remains unclear. To evaluate DEHP-exerted potential neurotoxicity in cerebellum, male quails were exposed with 0, 250, 500 and 750 mg/kg BW/day DEHP by gavage treatment for 45 days. Neurobehavioral abnormality and cerebellar histopathological alternation were observed in DEHP-induced quails...
April 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28412506/long-term-di-2-ethylhexyl-phthalate-exposure-promotes-proliferation-and-survival-of-hepg2-cells-via-activation-of-nf%C3%AE%C2%BAb
#7
Ning Wei, Xiaoyan Feng, Zhiqin Xie, Yanan Zhang, Ying Feng
Di (2-ethylhexyl)-phthalate (DEHP) is the most commonly used plasticizer. DEHP can easily leach out from products into the environment and has become a significant environmental contamination. However, its carcinogenic effects in human remain controversial. In this study, we exposed hepatocellular carcinoma HepG2 cells to different concentrations of DEHP for a period of times, followed by a combination of RNA-seq analysis and molecular analysis for DEHP-altered genes. We observed that long-term and very low-dose DEHP treatment has growth-inducing activity in HepG2 cells, while short-term and high-dose DEHP treatment has little effects on tumor cell proliferation...
April 13, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28410414/phthalate-exposure-and-reproductive-hormones-and-sex-hormone-binding-globulin-before-puberty-phthalate-contaminated-foodstuff-episode-in-taiwan
#8
Hui-Ju Wen, Chu-Chih Chen, Ming-Tsang Wu, Mei-Lien Chen, Chien-Wen Sun, Wen-Chiu Wu, I-Wen Huang, Po-Chin Huang, Tzu-Yun Yu, Chao A Hsiung, Shu-Li Wang
BACKGROUND: In May 2011, a major incident involving phthalates-contaminated foodstuffs occurred in Taiwan. Di-(2-ethylhexyl) phthalate (DEHP) was added to foodstuffs, mainly juice, jelly, tea, sports drink, and dietary supplements. Concerns arose that normal pubertal development, especially reproductive hormone regulation in children, could be disrupted by DEHP exposure. OBJECTIVE: To investigate the association between phthalate exposure and reproductive hormone levels among children following potential exposure to phthalate-tainted foodstuffs...
2017: PloS One
https://www.readbyqxmd.com/read/28392401/toxicoanthropology-phthalate-exposure-in-relation-to-market-access-in-a-remote-forager-horticulturalist-population
#9
Marissa Sobolewski, Bernard Weiss, Melanie Martin, Michael Gurven, Emily Barrett
Phthalates are a class of plasticizing chemicals produced in high volume and widely found in consumer products. Evidence suggests that phthalates may have non-monotonic effects on reproductive hormone activity. With exposure to phthalates virtually ubiquitous among industrialized populations, identifying unexposed and/or minimally exposed human populations is essential for understanding the effects of low level exposures. Our primary objective was to quantify urinary phthalate metabolite concentrations in the Tsimane', a remote population of Bolivian forager-horticulturalists...
March 27, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28367427/di-2-ethylhexyl-phthalate-induced-hippocampus-derived-neural-stem-cells-proliferation
#10
Alireza Abdanipour, Ali Noori-Zadeh, Seyed Alireza Mesbah-Namin, Salar Bakhtiyari, Reza Nejatbakhsh, Iraj Jafari Anarkooli
The brain and spinal cord have a limited capacity for self-repair under damaged conditions. One of the best options to overcome these limitations involves the use of phytochemicals as potential therapeutic agents. In this study, we have aimed to investigate the effects of di-(2-ethylhexyl) phthalate (DEHP) on hippocampus-derived neural stem cells (NSCs) proliferation to search phytochemical candidates for possible treatment of neurological diseases using endogenous capacity. In this experimental study, neonatal rat hippocampus-derived NSCs were cultured and treated with various concentrations of DEHP (0, 100, 200, 400 and 600 µM) and Cirsium vulgare (C...
April 2017: Cell Journal
https://www.readbyqxmd.com/read/28365455/toxic-effects-of-polyethylene-terephthalate-microparticles-and-di-2-ethylhexyl-phthalate-on-the-calanoid-copepod-parvocalanus-crassirostris
#11
Franz M Heindler, Fahad Alajmi, Roger Huerlimann, Chaoshu Zeng, Stephen J Newman, George Vamvounis, Lynne van Herwerden
Large amounts of plastic end up in the oceans every year where they fragment into microplastics over time. During this process, microplastics and their associated plasticizers become available for ingestion by different organisms. This study assessed the effects of microplastics (Polyethylene terephthalate; PET) and one plasticizer (Di(2-ethylhexyl)phthalate; DEHP) on mortality, productivity, population sizes and gene expression of the calanoid copepod Parvocalanus crassirostris. Copepods were exposed to DEHP for 48h to assess toxicity...
March 30, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28358912/phthalate-release-in-leachate-from-municipal-landfills-of-central-poland
#12
Paweł Wowkonowicz, Marta Kijeńska
Phthalate diesters (PAEs) are used as plasticizer additives to polymer chains to make the material more flexible and malleable. PAEs are bonded physically, not chemically, to the polymeric matrix and can migrate to and leach from the product surface, posing a serious danger to the environment and human health. There have been a number of studies on PAE concentrations in landfill leachate conducted in the EU and around the world, though few in Poland. In the present study, the leachate of five municipal landfills was analyzed for the presence of PAEs...
2017: PloS One
https://www.readbyqxmd.com/read/28356236/characterization-of-the-groove-binding-between-di-2-ethylhexyl-phthalate-and-calf-thymus-dna
#13
Song Li, Junhui Pan, Guowen Zhang, Jianjian Xu, Deming Gong
In this study, the interaction between di-(2-ethylhexyl) phthalate (DEHP) and calf thymus DNA (ctDNA) was investigated by a combination of multispectroscopic methods, chemometrics algorithm, cyclic voltammetry and molecular simulation. The concentration profiles of the components obtained from resolving the UV-vis absorption data by multivariate curve resolution-alternating least-squares (MCR-ALS) provided a basic evidence for the formation of DEHP-ctDNA complex. Furthermore, the groove binding of DEHP to ctDNA was evidenced by the results from iodide quenching effect, single-stranded DNA quenching effect, melting studies, viscosity measurements and cyclic voltammetry...
March 27, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28352099/removal-of-diethylhexyl-phthalate-from-hands-by-handwashing-evidence-from-experimental-n-of-1-and-crossover-designs
#14
Pi-I D Lin, Chia-Fang Wu, Hwang-Shang Kou, Tzu-Ying Huang, Jentaie Shiea, Ming-Tsang Wu
Phthalate exposure through skin is often neglected due to the small quantity and limited dermal absorption rate. However, free phthalate can be ingested by hand-to-mouth action or by contact with food. To evaluate the effectiveness in removing phthalate exposure on hand, we compare here the removal efficiency of di-(2-ethylhexyl)phthalate (DEHP) on hands by handwashing with soap-and-water versus water-only. In two three-day N-of-1 trials, residual DEHP was measured in a single female adult who washed exposed hands with soap-and-water or water-only...
March 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28346078/molecular-dynamics-simulation-of-three-plastic-additives-diffusion-in-polyethylene-terephthalate
#15
Bo Li, Zhi-Wei Wang, Qin-Bao Lin, Chang-Ying Hu
Accurate diffusion coefficient data of additives in polymer is of paramount importance for estimating the migration of the additives over time. In this article it is shown how this diffusion coefficient can be estimated for three plastic additives [2-(2'-hydroxy-5'-methylphenyl) (UV-P), 2, 6-di-tert-butyl-4-methylphenol (BHT) and di-(2-ethylhexyl) phthalate (DEHP)] in polyethylene terephthalate (PET) using the molecular dynamics (MD) simulation method. MD simulations were performed at temperatures of 293-433 K...
March 27, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28342962/intellectual-evaluation-of-children-exposed-to-phthalate-tainted-products-after-the-2011-taiwan-phthalate-episode
#16
Po-Chin Huang, Chih-Hsin Tsai, Chu-Chih Chen, Ming-Tsang Wu, Mei-Lien Chen, Shu-Li Wang, Bai-Hsiun Chen, Ching-Chang Lee, Jouni J K Jaakkola, Wen-Chiu Wu, Min-Kung Chen, Chao A Hsiung, Rapit Group
INTRODUCTION: Phthalate exposure may reduce intellectual development in young children. In 2011, numerous Taiwanese children had been reported to have consumed phthalate-tainted products. We investigated the effects of phthalate exposure on the intellectual development of these children after the 2011 Taiwan di-2-ethylhexyl phthalate (DEHP) episode. METHODS: We recruited 204 children, aged 3-12 y, from 3 hospitals in Taiwan between 2012 and 2013. First-morning urine samples were collected for analyzing 5 phthalate metabolites...
March 27, 2017: Environmental Research
https://www.readbyqxmd.com/read/28327585/estimated-daily-intake-and-cumulative-risk-assessment-of-phthalates-in-the-general-taiwanese-after-the-2011-dehp-food-scandal
#17
Jung-Wei Chang, Ching-Chang Lee, Wen-Harn Pan, Wei-Chun Chou, Han-Bin Huang, Hung-Che Chiang, Po-Chin Huang
A food scandal occurred in Taiwan in 2011 because the DEHP (di-2-ethylhexyl phthalate) had been intentionally used in food products. We assessed the daily intakes (DIs) and cumulative risk of phthalates in Taiwan's general population after the scandal. The DIs of 6 phthalates, including di-n-butyl phthalate (DnBP), di-iso-butyl phthalate (DiBP), and DEHP, were evaluated using urinary phthalate metabolites. Hazard quotients of phthalates classified as affecting the reproductive (HQrep) and hepatic (HQhep) systems were assessed using cumulative approach...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28324030/early-prenatal-phthalate-exposure-sex-steroid-hormones-and-newborn-birth-outcomes
#18
Sheela Sathyanarayana, Samantha Butts, Christina Wang, Emily Barrett, Ruby Nguyen, Stephen M Schwartz, Wren Haaland, Shanna H Swan
Background: Adequate sex steroid hormone concentrations are essential for normal fetal genital development in early pregnancy. Our previous study demonstrated an inverse relationship between third trimester di-ethyl hexyl (DEHP) phthalate exposure and total testosterone (TT) concentrations. Here, we examine early pregnancy phthalates, sex steroid hormone concentrations, and newborn reproductive outcomes. Methods: We examined associations between urinary phthalate metabolite concentrations in early pregnancy and serum free testosterone (FT), TT, estrone (E1), and estradiol (E2) in 591 woman/infant dyads in The Infant Development and Environment Study; we also examined relationships between hormones and newborn genital outcomes using multiple regression models with covariate adjustment...
March 9, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28319143/toxicity-effects-of-di-2-ethylhexyl-phthalate-to-eisenia-fetida-at-enzyme-cellular-and-genetic-levels
#19
Tingting Ma, Wei Zhou, Li'ke Chen, Longhua Wu, Peter Christie, Haibo Zhang, Yongming Luo
Di-(2-ethylhexyl) phthalate (DEHP) is a dominant phthalic acid ester (PAE) that has aroused public concern due to its resistance to degradation and its toxicity as an endocrine-disrupting compound. Effects of different concentrations of DEHP on Eisenia fetida in spiked natural soil have been studied in the body of the earthworm by means of soil cultivation tests 7, 14, 21 and 28 days after exposure. The results indicated that, in general, superoxide dismutase (SOD) activity, malondialdehyde (MDA) content, metallothionein (MT) content, the expression of heat shock protein 70 (HSP 70) and all the tested geno-toxicity parameters are promoted as time elapses and with increasing concentration of DEHP...
2017: PloS One
https://www.readbyqxmd.com/read/28314884/exposure-to-di-2-ethylhexyl-terephthalate-in-a-convenience-sample-of-u-s-adults-from-2000-to-2016
#20
Manori J Silva, Lee-Yang Wong, Ella Samandar, James L Preau, Antonia M Calafat, Xiaoyun Ye
Di-2-ethylhexyl terephthalate (DEHTP), a structural isomer of di-2-ethylhexyl phthalate (DEHP), is a plasticizer used in a variety of commercial applications, but data on Americans' exposure to DEHTP do not exist. We investigated the exposure to DEHTP in a convenience group of U.S. adults by analyzing urine collected anonymously in 2000 (N = 44), 2009 (N = 61), 2011 (N = 81), 2013 (N = 92), and 2016 (N = 149) for two major DEHTP oxidative metabolites: mono-2-ethyl-5-carboxypentyl terephthalate (MECPTP) and mono-2-ethyl-5-hydroxyhexyl terephthalate (MEHHTP)...
March 17, 2017: Archives of Toxicology
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