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https://www.readbyqxmd.com/read/29455282/molecularly-imprinted-vs-reversed-phase-extraction-for-the-determination-of-zearalenone-a-method-development-and-critical-comparison-of-sample-clean-up-efficiency-achieved-in-an-on-line-coupled-spe-chromatography-system
#1
Ivona Lhotská, Barbora Gajdošová, Petr Solich, Dalibor Šatínský
Sample preparation prior to chromatographic separation plays an important role in the analytical process. To avoid time-consuming and manual handling sample-prep, automated on-line techniques such as on-line SPE-HPLC are therefore preferred. In this study, two different on-line extraction approaches for mycotoxin/endocrine disruptor zearalenone (ZEA) determination using either molecularly imprinted polymer (MIP) with selective cavities and binding sites for extraction or a reversed-phase sorbent C18 providing non-selective interactions have been developed, validated, and compared...
February 17, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29449124/investigating-pka-rii-specificity-using-analogs-of-the-pka-akap-peptide-inhibitor-stad-2
#2
N George Bendzunas, Sabrina Dörfler, Karolin Autenrieth, Daniela Bertinetti, Erik M F Machal, Eileen J Kennedy, Friedrich W Herberg
Generation of the second messenger molecule cAMP mediates a variety of cellular responses which are essential for critical cellular processes. In response to elevated cAMP levels, cAMP dependent protein kinase (PKA) phosphorylates serine and threonine residues on a wide variety of target substrates. In order to enhance the precision and directionality of these signaling events, PKA is localized to discrete locations within the cell by A-kinase anchoring proteins (AKAPs). The interaction between PKA and AKAPs is mediated via an amphipathic α-helix derived from AKAPs which binds to a stable hydrophobic groove formed in the dimerization/docking (D/D) domain of PKA-R in an isoform-specific fashion...
February 12, 2018: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29435998/environmental-mixture-with-estrogenic-activity-increases-hsd3b1-expression-through-estrogen-receptors-in-immature-rat-granulosa-cells
#3
Dragana Samardzija Nenadov, Kristina Pogrmic-Majkic, Svetlana Fa, Bojana Stanic, Aleksandra Tubic, Nebojsa Andric
Humans are exposed not only to single endocrine disruptors, but also to chemical mixtures that can adversely affect their reproductive health. Steroidogenesis in reproductive tissues is emerging as the key target of endocrine disruptor action. Here, we analyzed the effect of environmental chemical mixtures with estrogenic activity on steroidogenic processes in immature rat granulosa cells and whether the observed steroidogenic effects were mediated through estrogen receptors. Extracts from untreated wastewater were prepared by solid-phase extraction and silica gel fractionation...
February 13, 2018: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29432759/bisphenol-a-exposure-disturbs-the-bone-metabolism-an-evolving-interest-towards-an-old-culprit
#4
REVIEW
Zar Chi Thent, Gabriele Ruth Anisah Froemming, Suhaila Muid
Bisphenol A (BPA) (2,2,-bis (hydroxyphenyl) propane), a well-known endocrine disruptor (ED), is the exogenous chemical that mimic the natural endogenous hormone like oestrogen. Due to its extensive exposure to humans, BPA is considered to be a major toxicological agent for general population. Environmental exposure of BPA results in adverse health outcomes including bone loss. BPA disturbs the bone health by decreasing the plasma calcium level and inhibiting the calcitonin secretion. BPA also stimulated differentiation and induced apoptosis in human osteoblasts and osteoclasts...
February 9, 2018: Life Sciences
https://www.readbyqxmd.com/read/29428396/concerns-related-to-ed-mediated-effects-of-bisphenol-a-and-their-regulatory-consideration
#5
REVIEW
(no author information available yet)
The extensive database on BPA provides strong evidence of its adverse effects on reproductive, neurobehavioral, metabolic functions and mammary gland. Disruption of estrogenic pathway is central in the mediation of these effects although other modes of action may be involved. BPA has a weak affinity for ERα/β but interaction with extranuclearly located pathways activated by estrogens such as ERRγ and GPER reveals how BPA can act at low doses. The effects are observed later in life after developmental exposure and are associated with pathologies of major societal concern in terms of severity, incidence, impact on quality of life, burden on public health system...
February 8, 2018: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/29427952/survey-of-218-organic-contaminants-in-groundwater-derived-from-the-world-s-largest-untreated-wastewater-irrigation-system-mezquital-valley-mexico
#6
Luis E Lesser, Abrahan Mora, Cristina Moreau, Jürgen Mahlknecht, Arturo Hernández-Antonio, Aldo I Ramírez, Héctor Barrios-Piña
The Mezquital Valley system is the world's oldest and largest example with regard to use of untreated wastewater for agricultural irrigation. Because of the artificial high recharge associated with the Mezquital Valley aquifers, groundwater is extracted for human consumption, and there are plans to use this groundwater as a water resource for Mexico City. Thus, this study analyzed 218 organic micro-contaminants in wastewater, springs, and groundwater from Mezquital Valley. Five volatile organic compounds (VOCs) and nine semi-volatile organic compounds (SVOCs) were detected in the wastewater used for irrigation...
February 3, 2018: Chemosphere
https://www.readbyqxmd.com/read/29426029/endocrine-disrupting-chemicals-in-seminal-plasma-and-couple-fecundity
#7
Germaine M Buck Louis, Melissa M Smarr, Liping Sun, Zhen Chen, Masato Honda, Wei Wang, Rajendiran Karthikraj, Jennifer Weck, Kurunthachalam Kannan
Growing evidence supports the importance of men's exposure to non-persistent endocrine disruptors (EDCs) and couple fecundability, as measured by time-to-pregnancy (TTP). This evolving literature contrasts with the largely equivocal findings reported for women's exposures and fecundity. While most evidence relies upon urinary concentrations, quantification of EDCs in seminal plasma may be more informative about potential toxicity arising within the testes. We analyzed 5 chemical classes of non-persistent EDCs in seminal plasma for 339 male partners of couples who were recruited prior to conception and who were followed daily until pregnant or after one year of trying...
February 6, 2018: Environmental Research
https://www.readbyqxmd.com/read/29426018/regulatory-identification-of-bpa-as-an-endocrine-disruptor-context-and-methodology
#8
REVIEW
C Beausoleil, C Emond, J P Cravedi, J P Antignac, M Applanat, B M R Appenzeller, R Beaudouin, L P Belzunces, M C Canivenc-Lavier, N Chevalier, C Chevrier, E Elefant, F Eustache, R Habert, M Kolf-Clauw, B Le Magueresse-Battistoni, S Mhaouty-Kodja, C Minier, L Multigner, H Schroeder, P Thonneau, C Viguié, F Pouzaud, J N Ormsby, C Rousselle, L Verines-Jouin, E Pasquier, C Michel
BPA is one of the most investigated substances for its endocrine disruptor (ED) properties and it is at the same time in the center of many ED-related controversies, the analysis on how BPA fits to the regulatory identification as an ED is a challenge in terms of methodology. It is also a great opportunity to test the regulatory framework with a uniquely data-rich substance and learn valuable lessons for future cases. From this extensive database, it was considered important to engage in a detailed analysis so as to provide specific and strong evidences of ED while reflecting accurately the complexity of the response as well the multiplicity of adverse effects...
February 6, 2018: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/29421408/exposure-to-organophosphate-flame-retardants-in-spray-polyurethane-foam-applicators-role-of-dermal-exposure
#9
Anila Bello, Courtney C Carignan, Yalong Xue, Heather M Stapleton, Dhimiter Bello
BACKGROUND: Spray polyurethane foam (SPF) is a highly effective thermal insulation material that has seen considerable market growth in the past decade. Organophosphate flame retardants (PFRs) are added to SPF formulations to meet fire code requirements. A common flame retardant used in SPF formulations is tris 1-chloro 2-propyl phosphate (TCIPP), a suspected endocrine disruptor. Exposure monitoring efforts during SPF applications have focused primarily on the isocyanate component, a potent respiratory and dermal sensitizer...
January 29, 2018: Environment International
https://www.readbyqxmd.com/read/29421407/biomonitoring-pfaas-in-blood-and-semen-samples-investigation-of-a-potential-link-between-pfaas-exposure-and-semen-mobility-in-china
#10
Xiaofei Song, Shaoyu Tang, Haimin Zhu, Zhiyuan Chen, Zhijun Zang, Yanan Zhang, Xiaojun Niu, Xiaojun Wang, Hua Yin, Feng Zeng, Chang He
Perfluoroalkyl acids (PFAAs) have been suspected to act as endocrine disruptors and adversely affect human reproductive health. We aimed to investigate the association between PFAAs in blood and semen, explore a potential link between PFAAs exposure and semen quality in the population of the Pearl River Delta (PRD) region in China, one of the "world factories". The monitoring results demonstrated that the population (103 male participants) from the PRD region in this study had higher PFAAs levels in blood and semen than some other areas in China...
January 29, 2018: Environment International
https://www.readbyqxmd.com/read/29421383/latrunculin-b-and-substratum-stiffness-regulate-corneal-fibroblast-to-myofibroblast-transformation
#11
Sara M Thomasy, Vijay Krishna Raghunathan, Hidetaka Miyagi, Alexander T Evashenk, Jasmyne C Sermeno, Geneva K Tripp, Joshua T Morgan, Christopher J Murphy
The transformation of keratocytes and fibroblasts to myofibroblasts is important to corneal wound healing as well as formation of stromal haze. The purpose of this study was to determine the effect of latrunculin B, an actin cytoskeleton disruptor in conjunction with a fundamental biophysical cue, substrate stiffness, on myofibroblast transformation in vitro and in vivo. Rabbit corneal fibroblasts were cultured on substrates of differing compliance (1.5, 22, and 71 kPa) and tissue culture plastic (TCP; > 1 GPa) in media containing 0 or 10 ng/ml TGFβ1 for 72 h...
February 5, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29421051/diurnal-changes-of-glycogen-molecular-structure-in-healthy-and-diabetic-mice
#12
Zhenxia Hu, Bin Deng, Xinle Tan, Hua Gan, Cheng Li, Sharif S Nada, Mitchell A Sullivan, Jialun Li, Xiaoyin Jiang, Enpeng Li, Robert G Gilbert
Glycogen is a complex branched glucose polymer functioning as a blood-sugar reservoir in animals. Liver glycogen β particles can bind together to form α particles, which have a slower enzymatic degradation to glucose. The linkage between β particles in α particles in diabetic liver breaks (is fragile) in dimethyl sulfoxide (DMSO), a H-bond disruptor, consistent with blood-sugar homeostasis loss in diabetes. We examined diurnal changes in the molecular structure of healthy and diabetic mouse-liver glycogen...
April 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29416720/targeting-the-golgi-apparatus-to-overcome-acquired-resistance-of-non-small-cell-lung-cancer-cells-to-egfr-tyrosine-kinase-inhibitors
#13
Yoshimi Ohashi, Mutsumi Okamura, Ryohei Katayama, Siyang Fang, Saki Tsutsui, Akinobu Akatsuka, Mingde Shan, Hyeong-Wook Choi, Naoya Fujita, Kentaro Yoshimatsu, Isamu Shiina, Takao Yamori, Shingo Dan
Epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitors (EGFR-TKIs) were demonstrated to provide survival benefit in patients with non-small cell lung cancer (NSCLC) harboring activating mutations of EGFR; however, emergence of acquired resistance to EGFR-TKIs has been shown to cause poor outcome. To overcome the TKI resistance, drugs with different mode of action are required. We previously reported that M-COPA (2-methylcoprophilinamide), a Golgi disruptor, suppressed the growth of gastric cancers overexpressing receptor tyrosine kinases (RTKs) such as hepatocyte growth factor receptor (MET) via downregulating their cell surface expression...
January 5, 2018: Oncotarget
https://www.readbyqxmd.com/read/29409581/endocrine-disruption-activity-of-30-day-dietary-exposure-to-decabromodiphenyl-ethane-in-balb-c-mouse
#14
Ru Bao Sun, Shuai Shang, Wei Zhang, Ben Cheng Lin, Qiang Wang, Yun Shi, Zhu Ge Xi
OBJECTIVE: This study aimed to evaluate the hepatotoxicity, metabolic disturbance activity and endocrine disrupting activity of mice treated by Decabromodiphenyl ethane (DBDPE). METHODS: In this study, Balb/C mice were treated orally by gavage with various doses of DBDPE. After 30 days of treatment, mice were sacrificed; blood, livers and thyroid glands were obtained, and hepatic microsomes were isolated. Biochemical parameters including 8 clinical chemistry parameters, blood glucose and hormone levels including insulin and thyroid hormone were assayed...
January 2018: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29408767/the-woven-endobridge-web-for-endovascular-therapy-of-intracranial-aneurysms-update-of-a-systematic-review-with-meta-analysis
#15
Noam Tau, Udi Sadeh-Gonik, Gilles Aulagner, Francis Turjman, Benjamin Gory, Xavier Armoiry
OBJECTIVES: Endovascular treatment of wide-neck intracranial aneurysms (IAs) is challenging, especially in bifurcation location. The intra-saccular flow-disruptor Woven EndoBridge (WEB) offers a new concept of endovascular therapy for wide-neck IAs. We performed an update of a systematic review aimed to report the feasibility, effectiveness and safety of WEB device therapy. PATIENTS AND METHODS: A systematic review was conducted using several electronic databases (including PUBMED and EMBASE), searching for studies published between October 2015 and December 2017 (those published between January 2010 and September 2015 were included in our initial systematic review)...
January 31, 2018: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29407805/tetrabromobisphenol-a-caused-neurodevelopmental-toxicity-via-disrupting-thyroid-hormones-in-zebrafish-larvae
#16
Biran Zhu, Gang Zhao, Lihua Yang, Bingsheng Zhou
Tetrabromobisphenol A (TBBPA), one of the most widely used brominated flame retardants (BFRs), has resulted in worldwide environmental contamination. TBBPA has been reported as a thyroid endocrine disruptor and a potential neurotoxicant. However, the underlying mechanism is still not clear. In this study, zebrafish (Danio rerio) embryos (2 h post-fertilization, hpf) were exposed to different concentrations of TBBPA (50, 100, 200 and 400 μg/L) alone or in combination with 3,3',5-triiodo-l-thyronine (T3, 20 μg/L + TBBPA, 200 μg/L)...
February 1, 2018: Chemosphere
https://www.readbyqxmd.com/read/29407779/bisphenol-a-bpa-modulates-the-expression-of-endocrine-and-stress-response-genes-in-the-freshwater-snail-physa-acuta
#17
Mónica Morales, Pedro Martínez-Paz, Paloma Sánchez-Argüello, Gloria Morcillo, José Luis Martínez-Guitarte
Bisphenol A (BPA), a known endocrine disrupting chemical (EDC) that can mimic the action of oestrogens by interacting with hormone receptors, is potentially able to influence reproductive functions in vertebrates and invertebrates. The freshwater pulmonate Physa acuta is a sensitive organism to xenobiotics appropriate for aquatic toxicity testing in environmental studies. This study was conducted to explore the effects of BPA on the Gastropoda endocrine system. The effects following a range of exposure times (5-96h) to BPA in P...
January 31, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29404631/new-mechanistic-insights-on-the-metabolic-disruptor-role-of-chlorpyrifos-in-apoe-mice-a-focus-on-insulin-and-leptin-signalling-pathways
#18
Fiona Peris-Sampedro, Jordi Blanco, Maria Cabré, Pia Basaure, Laia Guardia-Escote, Jose L Domingo, Domènec J Sánchez, Maria Teresa Colomina
Recently, we have provided evidence, suggesting that mice expressing the human apolipoprotein E3 (apoE3) are more prone to develop an obesity-like phenotype and a diabetic profile when subchronically fed a chlorpyrifos (CPF)-supplemented diet. The aim of the current study was to examine the underlying mechanisms through which CPF alters both insulin- and leptin-signalling pathways in an APOE-dependent manner. Both adult apoE3- and E4-targeted replacement and C57BL/6 mice were exposed to CPF at 0 or 2 mg/kg body weight/day through the diet for 8 consecutive weeks...
February 5, 2018: Archives of Toxicology
https://www.readbyqxmd.com/read/29391015/bisphenol-a-increases-risk-for-presumed-non-alcoholic-fatty-liver-disease-in-hispanic-adolescents-in-nhanes-2003-2010
#19
Sofia G Verstraete, Janet M Wojcicki, Emily R Perito, Philip Rosenthal
BACKGROUND: Bisphenol-A (BPA) is a ubiquitous chemical and recognized endocrine disruptor associated with obesity and related disorders. We explored the association between BPA levels and suspected non-alcoholic fatty liver disease (NAFLD). METHODS: Unweighted analyses were used to study the relationship between urinary BPA levels and suspected NAFLD (alanine aminotransferase (ALT). > 30 U/L, body mass index (BMI) Z-score > 1.064 and evidence of insulin resistance) using National Health and Nutrition Examination Survey (NHANES) data (2003-2010) on 12-19 year olds...
February 1, 2018: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/29383186/bisphenol-a-induces-cell-cycle-arrest-in-primary-and-prostate-cancer-cells-through-egfr-erk-p53-signaling-pathway-activation
#20
Antonio Bilancio, Paola Bontempo, Marzia Di Donato, Mariarosaria Conte, Pia Giovannelli, Lucia Altucci, Antimo Migliaccio, Gabriella Castoria
Bisphenol A (BPA) belongs to the class of chemicals known as endocrine disruptors and has been also involved in the pathogenesis and progression of endocrine related cancer such as breast and prostate cancers. Here, we have investigated the effect of BPA in human prostate cancer LNCaP cells and in human non-transformed epithelial prostate EPN cells. Our data showed that BPA induces the down regulation of cyclin D1 expression and the upregulation of the cell cycle inhibitors p21 and p27, leading to cell cycle arrest...
December 29, 2017: Oncotarget
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