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Journal of Toxicology and Environmental Health. Part A

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https://www.readbyqxmd.com/read/28910589/persistent-organic-pollutants-and-related-biological-responses-measured-in-coastal-fish-using-chemical-and-biological-screening-methods
#1
Zhanna Tairova, Jakob Strand, Rossana Bossi, Martin M Larsen, Lars Förlin, Anders Bignert, Jenny Hedman, Jens Gercken, Thomas Lang, Nicolai F Fricke, Gert Asmund, Manhai Long, Eva C Bonefeld-Jørgensen
The aim of this study was to investigate the spatial distribution, levels of dioxin-like compounds (DLC), and biological responses in two fish species. The viviparous eelpout (Zoarces viviparus) was collected from various locations in the Baltic Sea and in fjords of Kattegat and Skagerrak, while shorthorn sculpin (Myoxocephalus scorpius) was obtained at the polychlorinated biphenyl (PCB) polluted site in North West Greenland. Significant differences were detected both in contaminant levels and relative contributions from either polychlorinated dibenzodioxins (PCDD) or polychlorinated dibenzofurans (PCDF or furans) and mono-ortho- and non-ortho (coplanar) polychlorinated biphenyls (dl-PCB)...
September 14, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28910587/trichosanthin-attenuates-vascular-injury-induced-neointimal-hyperplasia-following-balloon-catheter-injury-in-rats
#2
Min Qiu, Zheng Yang, Xiao-Hua Guo, Yu-Ting Song, Ming An, Guo-Jun Zhao, Miao Song, Xiao-Min Zhao, Yun-Shan Zhao, Quan-Li Liu
Trichosanthin (TCS), isolated from the root tuber of Trichosantheskirilowii, a well-known traditional Chinese medicinal plant, belonging to the Cucurbitaceae family, was found to exhibit numerous biological and pharmacological activities including anti-inflammatory. However, the effects of TCS on arterial injury induced neointimal hyperplasia and inflammatory cell infiltration remains poorly understood. The aim of study was to examine the effectiveness of TCS on arterial injury-mediated inflammatory processes and underlying mechanisms...
September 14, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28895799/protective-effects-of-bellidifolin-in-hypoxia-induced-in-pheochromocytoma-cells-pc12-and-underlying-mechanisms
#3
Zhi-Ying Zhao, Yang-Yang Gao, Li Gao, Ming Zhang, He Wang, Chun-Hong Zhang
Bellidifolin, a xanthone compound derived from plants of Gentiana species, is known to exert a variety of pharmacological activities including anti-oxidation, anti-inflammatory and antitumor actions as well as a protective effect on cerebral ischemic nerve injury. The aim of this study was to examine the protective effects of bellidifolin on nerve injury produced by hypoxia and possible underlying mechanisms using pheochromocytoma cells (PC12). Data showed that the viability of PC12 cells subjected to hypoxia resulted in a significant decrease; however; pretreatment with certain concentrations of bellidifolin (20 or 40 μmol/L) prior to hypoxia significantly increased the survival rate...
September 12, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28891787/biochemical-approaches-to-assess-oxidative-stress-induced-by-exposure-to-natural-and-synthetic-dyes-in-early-life-stages-in-zebrafish
#4
Flavia R Abe, Carlos Gravato, Amadeu M V M Soares, Danielle P de Oliveira
Zebrafish early life stages were found to be sensitive to several synthetic dyes widely used in industries. However, as environmental concentrations of such contaminants are often at sublethal levels, more sensitive methods are required to determine early-warning adverse consequences. The aim of this study was to utilize a multibiomarker approach to examine underlying oxidative stress mechanisms triggered by sublethal concentrations of synthetic azo dye Basic Red 51 (BR51), the natural dye erythrostominone (ERY), and its light-degraded product using zebrafish embryos...
September 11, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28891786/a-framework-and-case-studies-for-evaluation-of-enzyme-ontogeny-in-children-s-health-risk-evaluation
#5
Gary Ginsberg, Suryanarayana V Vulimiri, Yu-Sheng Lin, Jayaram Kancherla, Brenda Foos, Babasaheb Sonawane
Knowledge of the ontogeny of Phase I and Phase II metabolizing enzymes may be used to inform children's vulnerability based upon likely differences in internal dose from xenobiotic exposure. This might provide a qualitative assessment of toxicokinetic (TK) variability and uncertainty pertinent to early lifestages and help scope a more quantitative physiologically based toxicokinetic (PBTK) assessment. Although much is known regarding the ontogeny of metabolizing systems, this is not commonly utilized in scoping and problem formulation stage of human health risk evaluation...
September 11, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28891761/acute-and-physical-effects-of-water-based-drilling-mud-in-the-marine-copepod-calanus-finmarchicus
#6
Julia Farkas, Camilla Yvonne Bådsvik, Dag Altin, Trond Nordtug, Anders Johny Olsen, Bjørn Henrik Hansen
The aim of this study was to investigate impacts of fine particulate fraction of a commonly used barite-containing drilling mud on the pelagic filter feeding copepod Calanus finmarchicus. The results show that the tested drilling mud had a low acute toxicity on C. finmarchicus (LC50 > 320 mg/L) and that the observed toxicity was likely caused by dissolved constituents in the mud and not the particle phase containing the weighting agent barite. Further, animals were exposed to drilling mud at a concentration of 10 mg/L for 168 hr followed by a 100 hr recovery phase...
September 11, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28891756/evaluation-of-distribution-redox-parameters-and-genotoxicity-in-wistar-rats-co-exposed-to-silver-and-titanium-dioxide-nanoparticles
#7
Airton da Cunha Martins, Lara Ferreira Azevedo, Cecília Cristina de Souza Rocha, Maria Fernanda Hornos Carneiro, Vinicius Paula Venancio, Mara Ribeiro de Almeida, Lusânia Maria Greggi Antunes, Rodrigo de Carvalho Hott, Jairo Lisboa Rodrigues, Abayomi T Ogunjimi, Joseph A Adeyemi, Fernando Barbosa
The increasing production of silver nanoparticles (AgNPs) and titanium dioxide nanoparticles (TiO2NPs) has resulted in their elevated concentrations in the environment. This study was, therefore, aimed at determining the distribution, redox parameters, and genotoxic effects in male Wistar rats that were treated with either AgNP or TiO2NP individually, as well as under a co-exposure scenario. Animals were exposed via oral gavage to either sodium citrate buffer (vehicle), 0.5 mg/kg/day TiO2NP, 0.5 mg/kg/day AgNP or a mixture of TiO2NPs and AgNPs...
September 11, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28891753/the-influence-of-schisandrin-b-on-a-model-of-alzheimer-s-disease-using-%C3%AE-amyloid-protein-a%C3%AE-1-42-mediated-damage-in-sh-sy5y-neuronal-cell-line-and-underlying-mechanisms
#8
Ming Zhang, Hong-Xia Zheng, Yang-Yang Gao, Bo Zheng, Jing-Ping Liu, He Wang, Zhan-Jun Yang, Zhi-Ying Zhao
Schisandrin B, an active substance, is derived from Chinese herb fruit Wuweizi, which exerts various pharmacological activities and has displayed significant beneficial effects in ameliorating Alzheimer's disease (AD). The aim of this study was to further extend our examination for the use of schisandrin B extract in the potential treatment of AD effects by investigating DNA methylation (DNMT), known to be modified in this disease using SH-SY5Y neuronal cell line exposed to β-amyloid protein (Aβ1-42). In particular, the purpose of this investigation was to examine alterations in mRNA and protein expression of DNMT...
September 11, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28880816/5-aza-2-deoxycytidine-a-dna-methylation-inhibitor-induces-cytotoxicity-cell-cycle-dynamics-and-alters-expression-of-dna-methyltransferase-1-and-3a-in-mouse-hippocampus-derived-neuronal-ht22-cells
#9
Jing Yang, Xiaoli Tian, Jie Yang, Junhe Cui, Shuyuan Jiang, Rui Shi, You Liu, Xiaolei Liu, Wenqiang Xu, Wei Xie, Xiaoe Jia, Rengui Bade, Tao Zhang, Ming Zhang, Kerui Gong, Shaochun Yan, Zhanjun Yang, Guo Shao
Epigenetic processes such as DNA methylation are essential for processes of gene expression in normal mammalian development. DNA methyltransferases (DNMT) are responsible for initiating and maintaining DNA methylation. It is known that 5-Aza-CdR, an inhibitor of DNMT induces cytotoxicity by reducing DNMT activity in various tumor cell lines. However, disturbances in neuronal DNA methylation may also play a role in altered brain functions. Thus, it was of interest to determine whether alterations in DNA methylation might be associated with neuronal functions by using 5-Aza-CdR, on mouse hippocampus-derived neuronal HT22 cell line...
September 7, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28880815/effects-of-a-national-smoking-ban-on-hospital-admissions-for-cardiovascular-diseases-a-time-series-analysis-in-taiwan
#10
Yue-Nin Yang, Yu-Tung Huang, Chun-Yuh Yang
On January 11, 2009, a comprehensive smoking ban was implemented in Taiwan. The aim of this study was to evaluate the effect of this ban on hospital admissions for ischemic heart disease (IHD). Trends in the country-level monthly hospital admission rates for IHD were determined and frequency compared to other conditions such as control conditions cholecystitis, bowel obstruction, and appendicitis from January 1997 (1 year before the first phase of smoke-free laws was implemented) to December 2012 (3 years after the second phase of the ban)...
September 7, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28880814/investigation-of-full-scale-ozonation-at-a-municipal-wastewater-treatment-plant-using-a-toxicity-based-evaluation-concept
#11
Fabian Itzel, Linda Gehrmann, Helena Bielak, Paul Ebersbach, Andrea Boergers, Heinrich Herbst, Christian Maus, Anne Simon, Elke Dopp, Monika Hammers-Wirtz, Torsten C Schmidt, Jochen Tuerk
Effluents from municipal wastewater treatment plants (WWTPs) are known to be point sources of micropollutants for surface waters. The aim of this study was to examine a reconstructed full-scale ozonation equipped with a pump-injector system for ozone (O3) dosage and a fluidized moving-bed reactor as biological posttreatment at a municipal WWTP utilizing an effect-directed approach. This approach consists of chemical analysis in combination with toxicological tests for the assessment of treatment efficiency of the plant...
September 7, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28880749/exposure-to-decabromodiphenyl-ether-bde-209-produces-mitochondrial-dysfunction-in-rat-liver-and-cell-death
#12
Lilian C Pereira, Alecsandra O Souza, Maria J Tasso, Alana M C Oliveira, Filipe V Duarte, Carlos M Palmeira, Daniel J Dorta
Polybrominated diphenyl ethers (PBDE) are ubiquitous environmental pollutants. Exposure to these chemicals has been associated with developmental neurotoxicity, endocrine dysfunctions, reproductive disorders, and hepatotoxicity. The widespread use of PBDE as flame retardants has culminated in daily exposure of humans and wildlife to these contaminants and resulted in their banned use. Thus assessment of the potential effects of each PBDE congener on living organisms has become cause for concern. The aim of this study was to (1) examine the effects of decabromodiphenyl ether (BDE)-209 on different functions of HepG2 cells and (2) investigate whether this congener is involved in mitochondrial toxicity...
September 7, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28880744/the-effects-of-phenylethanoid-glycosides-derived-from-herba-cistanche-on-cognitive-deficits-and-antioxidant-activities-in-male-samp8-mice
#13
Jian-Xin Jia, Xu-Sheng Yan, Zhi-Ping Cai, Wei Song, Dong-Sheng Huo, Bai-Feng Zhang, He Wang, Zhan-Jun Yang
Cognitive deficits are closely associated with hippocampal synaptic changes. Phenylethanoid glycosides (PhG), derived from Herba cistanche, are known to exert protective effects on cognitive deficits in Alzheimer's disease (AD); however, the underlying mechanisms of this herbal extract on cognitive performance remain unclear. The aim of this study was thus to examine the protective mechanism attributed to PhG on cognitive deficits in an AD senescence accelerated mouse prone 8 (SAMP8) model. Cognitive deficit parameters examined included (1) Morris water maze (MWM) assessing cognitive performance and (2) quantification of dendritic spine density in hippocampal CA1 region by Golgi staining, a molecular biomarker of synaptic function...
September 7, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28880741/the-impact-of-repeated-organophosphorus-pesticide-exposure-on-biomarkers-and-neurobehavioral-outcomes-among-adolescent-pesticide-applicators
#14
Ahmed A Ismail, Kai Wang, James R Olson, Matthew R Bonner, Olfat Hendy, Gaafar Abdel Rasoul, Diane S Rohlman
Egyptian adolescents are hired as seasonal workers to apply pesticides to the cotton crop and may perform this occupation for several years. However, few studies examined the effects of repeated pesticide exposure on health outcomes The goal of this study was to determine the impact of repeated pesticide exposure on neurobehavioral (NB) performance and biomarkers of exposure (urinary metabolite) and effect (cholinesterase activity). Eighty-four adolescents from two field stations in Menoufia, Egypt, were examined four times: before and during pesticide application season in 2010 and again before and during application season in 2011...
September 7, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28880739/methionine-supplemented-diet-affects-the-expression-of-cardiovascular-disease-related-genes-and-increases-inflammatory-cytokines-in-mice-heart-and-liver
#15
Alexandre Ferro Aissa, Catia Lira do Amaral, Vinicius Paula Venancio, Carla da Silva Machado, Lívia Cristina Hernandes, Patrick Wellington da Silva Santos, Rui Curi, Maria de Lourdes Pires Bianchi, Lusânia Maria Greggi Antunes
Some important environmental factors that influence the development of cardiovascular diseases (CVD) include tobacco, excess alcohol, and unhealthy diet. Methionine obtained from the diet participates in the synthesis of DNA, proteins, lipids and affects homocysteine levels, which is associated with the elevated risk for CVD development. Therefore, the aim of this study was to investigate the manner in which dietary methionine might affect cellular mechanisms underlying CVD occurrence. Swiss albino mice were fed either control (0...
September 7, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28876214/exposing-northern-shrimp-pandalus-borealis-to-fish-feed-containing-the-antiparasitic-drug-diflubenzuron-caused-high-mortality-during-molting
#16
Renée Katrin Bechmann, Emily Lyng, Mark Berry, Alfhild Kringstad, Stig Westerlund
Use of the chitin synthesis inhibitor diflubenzuron (DFB) as an antiparasitic drug in salmon aquaculture raises concern over its impact on marine ecosystems. Further, global drivers, such as ocean warming and acidification (OAW), may increase the toxicity of hazardous substances including DFB. The aim of the present study was to examine the combined effects of DFB-medicated salmon feed on ovigerous Northern shrimp (Pandalus borealis) under Control (pHNBS 8.0, 7.0ºC) and OAW conditions (pHNBS 7.6, 9.5ºC). DFB-exposed shrimp consumed on average 0...
September 6, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28876212/international-meeting-of-environmental-health-and-toxicology-imehtox-advances-in-toxicology-and-environmental-health-in-brazil
#17
Fernando Barbosa
No abstract text is available yet for this article.
September 6, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28876179/the-inhibitory-effects-of-dracocephalum-moldavica-l-dml-on-rat-cerebral-ischemia-reperfusion-injury
#18
Jian-Xin Jia, Yu Zhang, Zhan-Li Wang, Xu-Sheng Yan, Min Jin, Dong-Sheng Huo, He Wang, Zhan-Jun Yang
Ischemia reperfusion injury (IRI) is closely associated with oxidative stress and inflammatory responses. Dracocephalum moldavica L. (DML), a Chinese herbal medicine is known to exert protective effects on myocardial ischemia reperfusion injury in rats by inhibiting oxidation damage and inflammatory reactions. However, the effectiveness of DML in cerebral ischemia reperfusion injury (CIRI) as a protective substance and the underlying mechanisms remain to be determined. The aim of this study was thus to examine the influence of DML on CIRI using a rat model induced by 2-h transient middle cerebral artery occlusion (MCAO) produced by intraluminal suture blockade followed by 22 h reperfusion...
September 6, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28862540/characterizing-cytotoxic-and-estrogenic-activity-of-arctic-char-tissue-extracts-in-primary-arctic-char-hepatocytes
#19
Karina Petersen, Maria T Hultman, Jenny Bytingsvik, Mikael Harju, Anita Evenset, Knut Erik Tollefsen
Contaminants from various anthropogenic activities are detected in the Arctic due to long-range atmospheric transport, ocean currents, and living organisms such as migrating fish or seabirds. Although levels of persistent organic pollutants (POPs) in Arctic fish are generally low, local hot spots of contamination were found in freshwater systems such as Lake Ellasjøen at Bjørnøya (Bear Island, Norway). Higher concentrations of organic halogenated compounds (OHC), and higher levels of cytochrome P450 and DNA-double strand breaks were reported in Arctic char (Salvelinus alpinus) from this lake compared to fish from other lakes on Bjørnøya...
September 1, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28862539/lead-pb-exposure-induces-disturbances-in-epigenetic-status-in-workers-exposed-to-this-metal
#20
Paula Pícoli Devóz, Willian Robert Gomes, Marília Ladeira De Araújo, Diego Luis Ribeiro, Tatiana Pedron, Lusânia Maria Greggi Antunes, Bruno Lemos Batista, Fernando Barbosa, Gustavo Rafael Mazzaron Barcelos
Previous studies showed that lead (Pb) exposure may modulate gene expression by changes in the epigenetic status. However, little is known about the impact of Pb exposure and alterations on DNA methylation patterns in humans exposed to this metal. The aim of this study was to assess the consequences of exposure to Pb on DNA global methylation, in order to gain a better understanding of the interactions between Pb exposure and epigenetic effects. The study included 100 male workers employed in automotive battery factories from Paraná State, Brazil...
September 1, 2017: Journal of Toxicology and Environmental Health. Part A
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