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Environmental exposure

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https://www.readbyqxmd.com/read/27913844/global-dna-methylation-profiling-of-manganese-exposed-human-neuroblastoma-sh-sy5y-cells-reveals-epigenetic-alterations-in-parkinson-s-disease-associated-genes
#1
Prashant Tarale, Saravanadevi Sivanesan, Atul P Daiwile, Reinhard Stöger, Amit Bafana, Pravin K Naoghare, Devendra Parmar, Tapan Chakrabarti, Krishnamurthi Kannan
Manganese (Mn) is an essential trace element required for optimal functioning of cellular biochemical pathways in the central nervous system. Elevated exposure to Mn through environmental and occupational exposure can cause neurotoxic effects resulting in manganism, a condition with clinical symptoms identical to idiopathic Parkinson's disease. Epigenetics is now recognized as a biological mechanism involved in the etiology of various diseases. Here, we investigated the role of DNA methylation alterations induced by chronic Mn (100 µM) exposure in human neuroblastoma (SH-SY5Y) cells in relevance to Parkinson's disease...
December 2, 2016: Archives of Toxicology
https://www.readbyqxmd.com/read/27913196/nf-kb-regulated-exosomal-mir-155-promotes-the-inflammation-associated-with-arsenite-carcinogenesis
#2
Chao Chen, Fei Luo, Xinlu Liu, Lu Lu, Hui Xu, Qianlei Yang, Junchao Xue, Le Shi, Jun Li, Aihua Zhang, Qizhan Liu
In the cancer microenvironment, extracellular communication allows various types of cells to coordinate and execute biological functions. Emerging evidence indicates that exosomes, as mediators of cell communication, are involved in tumor progression. Little is known, however, about the mechanism by which exosomal miRNAs regulate inflammatory infiltration in arsenite-induced liver cancer. The present research aimed to determine if miRNAs secreted from arsenite-transformed human hepatic epithelial (L-02) cells are transferred into normal L-02 and THLE-3 cells, which are functionally active in the recipient cells...
November 29, 2016: Cancer Letters
https://www.readbyqxmd.com/read/27913071/determination-and-validation-of-an-aquatic-maximum-acceptable-concentration-environmental-quality-standard-mac-eqs-value-for-the-agricultural-fungicide-azoxystrobin
#3
Elsa Teresa Rodrigues, Miguel Ângelo Pardal, Cristiano Gante, João Loureiro, Isabel Lopes
The main goal of the present study was to determine and validate an aquatic Maximum Acceptable Concentration-Environmental Quality Standard (MAC-EQS) value for the agricultural fungicide azoxystrobin (AZX). Assessment factors were applied to short-term toxicity data using the lowest EC50 and after the Species Sensitivity Distribution (SSD) method. Both ways of EQS generation were applied to a freshwater toxicity dataset for AZX based on available data, and to marine toxicity datasets for AZX and Ortiva(®) (a commercial formulation of AZX) obtained by the present study...
November 29, 2016: Environmental Pollution
https://www.readbyqxmd.com/read/27913018/potential-impact-of-flowback-water-from-hydraulic-fracturing-on-agricultural-soil-quality-metal-metalloid-bioaccessibility-microtox-bioassay-and-enzyme-activities
#4
Season S Chen, Yuqing Sun, Daniel C W Tsang, Nigel J D Graham, Yong Sik Ok, Yujie Feng, Xiang-Dong Li
Hydraulic fracturing has advanced the development of shale gas extraction, while inadvertent spills of flowback water may pose a risk to the surrounding environment due to its high salt content, metals/metalloids (As, Se, Fe and Sr), and organic additives. This study investigated the potential impact of flowback water on four representative soils from shale gas regions in Northeast China using synthetic flowback solutions. The compositions of the solutions were representative of flowback water arising at different stages after fracturing well establishment...
November 29, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27912980/lack-of-sustained-efficacy-for-alcohol-based-surgical-hand-rubs-containing-residual-active-ingredients-according-to-en-12791
#5
REVIEW
G Kampf, A Kramer, M Suchomel
The World Health Organization recommends the use of hand rubs with 'sustained activity' for surgical hand preparation. This review aims to verify whether any of the alcohol-based hand rubs containing non-volatile 'active ingredients' such as chlorhexidine digluconate (CHG), mecetronium ethylsulphate (MES), or ortho-phenylphenol (OPP) provides such sustained efficacy for surgical hand disinfection. Literature was searched to find studies according to EN 12791. Published data sets were analysed to verify whether any of the formulations has a superior efficacy (P<0...
November 12, 2016: Journal of Hospital Infection
https://www.readbyqxmd.com/read/27912918/the-use-of-potassium-hydroxide-koh-solution-as-a-suitable-approach-to-isolate-plastics-ingested-by-marine-organisms
#6
Susanne Kühn, Bernike van Werven, Albert van Oyen, André Meijboom, Elisa L Bravo Rebolledo, Jan A van Franeker
In studies of plastic ingestion by marine wildlife, visual separation of plastic particles from gastrointestinal tracts or their dietary content can be challenging. Earlier studies have used solutions to dissolve organic materials leaving synthetic particles unaffected. However, insufficient tests have been conducted to ensure that different categories of consumer products partly degraded in the environment and/or in gastrointestinal tracts were not affected. In this study 63 synthetic materials and 11 other dietary items and non-plastic marine debris were tested...
November 29, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/27912165/biomarker-analysis-of-american-toad-anaxyrus-americanus-and-grey-tree-frog-hyla-versicolor-tadpoles-following-exposure-to-atrazine
#7
Marcía N Snyder, W Matthew Henderson, Donna A Glinski, S Thomas Purucker
The objective of the current study was to use a biomarker-based approach to investigate the influence of atrazine exposure on American toad (Anaxyrus americanus) and grey tree frog (Hyla versicolor) tadpoles. Atrazine is one of the most frequently detected herbicides in environmental matrices throughout the United States. In surface waters, it has been found at concentrations from 0.04-2859μg/L and thus presents a likely exposure scenario for non-target species such as amphibians. Studies have examined the effect of atrazine on the metamorphic parameters of amphibians, however, the data are often contradictory...
November 21, 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27912012/coast-wide-recruitment-dynamics-of-olympia-oysters-reveal-limited-synchrony-and-multiple-predictors-of-failure
#8
Kerstin Wasson, Brent B Hughes, John S Berriman, Andrew L Chang, Anna K Deck, Paul A Dinnel, Charlie Endris, Michael Espinoza, Sarah Dudas, Matthew C Ferner, Edwin D Grosholz, David Kimbro, Jennifer L Ruesink, Alan C Trimble, Dick Vander Schaaf, Chela J Zabin, Danielle C Zacherl
Recruitment of new propagules into a population can be a critical determinant of adult density. We examined recruitment dynamics in the Olympia oyster (Ostrea lurida), a species occurring almost entirely in estuaries. We investigated spatial scales of interannual synchrony across 37 sites in eight estuaries along 2,500 km of Pacific North American coastline, predicting that high vs. low recruitment years would coincide among neighboring estuaries due to shared exposure to regional oceanographic factors. Such synchrony in recruitment has been found for many marine species and some migratory estuarine species, but has never been examined across estuaries in a species that can complete its entire life cycle within the same estuary...
December 2016: Ecology
https://www.readbyqxmd.com/read/27911986/persistent-organic-pollutants-in-adipose-tissue-should-be-considered-in-obesity-research
#9
Y-M Lee, K-S Kim, D R Jacobs, D-H Lee
Although low doses of persistent organic pollutants (POPs), strong lipophilic chemicals with long half-lives, have been linked to various endocrine, immune, nervous and reproductive system diseases, few obesity studies have considered adipose tissue as an important POPs exposure source. Because the toxicodynamics of POPs relate directly to the dynamics of adiposity, POPs might explain puzzling findings in obesity research. In two people exposed to the same amounts of environmental POPs, the one having more adipose tissue may be advantaged because POPs storage in adipose tissue can reduce burden on other critical organs...
December 2, 2016: Obesity Reviews: An Official Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/27911871/inhibition-of-cancer-antioxidant-defense-by-natural-compounds
#10
Alicja Sznarkowska, Anna Kostecka, Katarzyna Meller, Krzysztof Piotr Bielawski
All classic, non-surgical anticancer approaches like chemotherapy, radiotherapy or photodynamic therapy kill cancer cells by inducing severe oxidative stress. Even tough chemo- and radiotherapy are still a gold standard in cancer treatment, the identification of non-toxic compounds that enhance their selectivity, would allow for lowering their doses, reduce side effects and risk of second cancers. Many natural products have the ability to sensitize cancer cells to oxidative stress induced by chemo- and radiotherapy by limiting antioxidant capacity of cancer cells...
November 30, 2016: Oncotarget
https://www.readbyqxmd.com/read/27910990/a-ph-responsive-sequential-disassembly-nanohybrid-for-mitochondrial-targeting
#11
Lijia Li, Wei Sun, Lian Li, Yuanyuan Liu, Lei Wu, Fengling Wang, Zhou Zhou, Zhirong Zhang, Yuan Huang
Cationic materials have been reported as promising tools for targeting to mitochondria which are the "power houses" and "metabolic garbage keepers" of cells. However, their positive nature also restricts their in vivo application due to the quick clearance. Herein, we fabricated a nanohybrid consisting of the pH-responsive N-(2-hydroxypropyl)methacrylamide (HPMA) co-polymer (R-P) shells and positive mesoporous silica nanoparticle cores via electrostatic interaction. The anticancer drug, docetaxel (DTX), was encapsulated in the positive MSN cores (MSN-DTX)...
December 2, 2016: Nanoscale
https://www.readbyqxmd.com/read/27909634/nontuberculous-mycobacteria-lymphadenitis-a-case-report
#12
Amanda M Krantz, Meera Varnam, Cristina Fernandez
Atypical mycobacteria, also known as nontuberculous mycobacteria (NTM) includes acid-fast bacteria other than Mycobacterium tuberculosis. NTM can be isolated from a variety of environmental sources including water, food products, domestic animals, and soil; human exposure is typically from soil to the oral cavity and respiratory tract. Diagnosis of NTM is suspected in children less than five years old with subacute, unilateral, non-tender cervicofacial lymphadenitis in combination with a history of water exposure, penetrating injection, as well as negative routine cultures or response to antistaphylococcal and antistreptococcal antibiotics...
October 25, 2016: Curēus
https://www.readbyqxmd.com/read/27909446/functional-toxicogenomic-profiling-expands-insight-into-modulators-of-formaldehyde-toxicity-in-yeast
#13
Matthew North, Brandon D Gaytán, Carlos Romero, Vanessa Y De La Rosa, Alex Loguinov, Martyn T Smith, Luoping Zhang, Chris D Vulpe
Formaldehyde (FA) is a commercially important chemical with numerous and diverse uses. Accordingly, occupational and environmental exposure to FA is prevalent worldwide. Various adverse effects, including nasopharyngeal, sinonasal, and lymphohematopoietic cancers, have been linked to FA exposure, prompting designation of FA as a human carcinogen by U.S. and international scientific entities. Although the mechanism(s) of FA toxicity have been well studied, additional insight is needed in regard to the genetic requirements for FA tolerance...
2016: Frontiers in Genetics
https://www.readbyqxmd.com/read/27909222/associations-between-environmental-factors-and-hospital-admissions-for-sickle-cell-disease
#14
Frédéric B Piel, Sanjay Tewari, Valentine Brousse, Antonis Analitis, Anna Font, Stephan Menzel, Subarna Chakravorty, Swee Lay Thein, Baba Inusa, Paul Telfer, Marianne de Montalembert, Gary W Fuller, Klea Katsouyanni, David C Rees
Sickle cell disease (SCD) is an increasing global health burden. This inherited disease is characterised by a remarkable phenotypic heterogeneity, which can only partly be explained by genetic factors. Environmental factors are likely to play an important role but studies of their impact on disease severity are limited and their results are often inconsistent. This study investigated associations between a range of environmental factors and hospital admissions of young patients with SCD in London and in Paris between 2008 and 2012...
December 1, 2016: Haematologica
https://www.readbyqxmd.com/read/27908973/environmental-public-health-tracking-a-cost-effective-system-for-characterizing-the-sources-distribution-and-public-health-impacts-of-environmental-hazards
#15
P J Saunders, J D Middleton, G Rudge
BACKGROUND: The contemporary environment is a complex of interactions between physical, biological, socio-economic systems with major impacts on public health. However, gaps in our understanding of the causes, extent and distribution of these effects remain. The public health community in Sandwell West Midlands has collaborated to successfully develop, pilot and establish the first Environmental Public Health Tracking (EPHT) programme in Europe to address this 'environmental health gap' through systematically linking data on environmental hazards, exposures and diseases...
December 1, 2016: Journal of Public Health
https://www.readbyqxmd.com/read/27908783/lipid-peroxidation-in-face-of-dna-damage-dna-repair-and-other-cellular-processes
#16
Barbara Tudek, Daria Zdżalik-Bielecka, Agnieszka Tudek, Konrad Kosicki, Anna Fabisiewicz, Elżbieta Speina
Exocyclic adducts to DNA bases are formed as a consequence of exposure to certain environmental carcinogens as well as inflammation and lipid peroxidation (LPO). Complex family of LPO products gives rise to a variety of DNA adducts, which can be grouped in two classes: (i) small etheno-type adducts of strong mutagenic potential, and (ii) bulky, propano-type adducts, which block replication and transcription, and are lethal lesions. Etheno-DNA adducts are removed from the DNA by base excision repair (BER), AlkB and nucleotide incision repair enzymes (NIR), while substituted propano-type lesions by nucleotide excision repair (NER) and homologous recombination (HR)...
November 28, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27908667/concentrations-of-polychlorinated-dibenzodioxins-polychlorodibenzofurans-and-polychlorobiphenyls-in-women-of-reproductive-age-in-italy-a-human-biomonitoring-study
#17
Anna Maria Ingelido, Vittorio Abate, Annalisa Abballe, Fulvia Lucia Albano, Tatiana Battista, Valter Carraro, Michele Conversano, Rosa Corvetti, Silvia De Luca, Silva Franchini, Anna Rita Fulgenzi, Laura Giambanco, Nicola Iacovella, Anna Laura Iamiceli, Antonio Maiorana, Francesco Maneschi, Valentina Marra, Flavia Pirola, Maria Grazia Porpora, Enrico Procopio, Nicola Suma, Silvia Valentini, Luisa Valsenti, Valerio Vecchiè, Elena De Felip
BACKGROUND: Polychlorinated dibenzodioxins (PCDDs), polychlorodibenzofurans (PCDFs), and polychlorobiphenyls (PCBs) are persistent organic pollutants that represent a major concern for women of reproductive age because of the neurodevelopmental effects associated to perinatal exposure. OBJECTIVES: This study was aimed at characterizing exposure of women of reproductive age to PCDDs, PCDFs, and PCBs as a function of residence in different Italian Regions, in areas at presumable different environmental contamination and human exposure to these pollutants...
November 24, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/27908659/public-exposure-and-number-of-conspecifics-have-no-influence-on-ovarian-and-adrenal-activity-in-the-cheetah-acinonyx-jubatus
#18
Diana C Koester, David E Wildt, Janine L Brown, Karen Meeks, Adrienne E Crosier
Cheetahs in managed zoological collections do not reproduce efficiently, a problem that may be related to environmental/management stressors. In this study, we examined 17 adult female cheetahs to determine the influence of two environmental factors, (1) being housed on- or off-exhibit and (2) number of adult conspecifics (males and/or females) in nearby enclosures, on profiles and concentrations of ovarian and adrenal hormones. Secondarily, we assessed a subset of group-housed siblings (n = 5 in groups of 2 or 3) for effects of long-term cohabitation...
November 28, 2016: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/27908569/effectiveness-of-immunotherapy-in-children-depends-on-place-of-living-a-pilot-study
#19
M Pawlowski, J Jerzynska, D Podlecka, W Stelmach, P Majak, I Stelmach
BACKGROUND: It is considered that farm areas protect young patients from allergy and asthma due to high exposure to endotoxins. Allergen immunotherapy (AIT) is the only treatment of allergy modifying the immune response with the potential to change the natural history of allergic diseases. It seems that studies evaluating the efficacy of immunotherapy in large cohorts of allergic patients living in farm areas are needed to understand the influence of environment on immune response during AIT...
November 28, 2016: Allergologia et Immunopathologia
https://www.readbyqxmd.com/read/27908489/parental-smoking-during-pregnancy-shortens-offspring-s-legs
#20
E Żądzińska, S Kozieł, B Borowska-Strugińska, I Rosset, A Sitek, W Lorkiewicz
One of the most severe detrimental environmental factors acting during pregnancy is foetal smoke exposure. The aim of this study was to assess the effect of maternal, paternal and parental smoking during pregnancy on relative leg length in 7- to 10-year-old children. The research conducted in the years 2001-2002 included 978 term-born children, 348 boys and 630 girls, at the age of 7-10 years. Information concerning the birth weight of a child was obtained from the health records of the women. Information about the mother's and the father's smoking habits during pregnancy and about the mothers' education level was obtained from a questionnaire...
June 29, 2016: Homo: Internationale Zeitschrift Für die Vergleichende Forschung Am Menschen
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