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Arsenic exposure

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https://www.readbyqxmd.com/read/28077272/evaluation-of-sodium-arsenite-exposure-on-reproductive-competence-in-pregnant-and-postlactational-dams-and-their-offspring
#1
Nadia Soledad Bourguignon, María Marta Bonaventura, Diego Rodríguez, Marianne Bizzozzero, Clara Ventura, Mariel Nuñez, Victoria Adela Lux-Lantos, Carlos Libertun
We investigated arsenite exposure on the reproductive axis of dams (during pregnancy and at cyclicity resumption) and their offspring. Pregnant rats were exposed to 5 (A5) or 50ppm (A50) of sodium arsenite in drinking water from gestational day 1 (GD1) until sacrifice at GD18 or two months postpartum. Offspring were exposed to the same treatment as their mothers from weaning to adulthood. A50-pregnant rats gained less weight, showed increased testosterone and estradiol but pregnancy was unaffected. After lactation, arsenic-exposed dams presented compromised cyclicity, decreased estradiol, increased follicle-stimulating hormone (FSH), less preovulatory follicles and presence of ovarian cysts, suggesting impaired reproduction...
January 7, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28076949/arsenic-methyltransferase-is-involved-in-arsenosugar-biosynthesis-by-providing-dma
#2
Xi-Mei Xue, Jun Ye, Georg Raber, Kevin A Francesconi, Gang Li, Hong Gao, Yu Yan, Christopher Rensing, Yong-Guan Zhu
Arsenic is an ubiquitous toxic element in the environment, and organisms have evolved different arsenic detoxification strategies. Studies on arsenic biotransformation mechanisms have mainly focused on arsenate reduction, arsenite oxidation, and arsenic methylation; little is known, however, about the pathway for the biosynthesis of arsenosugars, which are significant arsenic transformation products. Here, the involvement of arsenite S-Adenosylmethionine methyltransferase (ArsM) in arsenosugar synthesis is demonstrated for the first time...
January 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28069514/increased-microrna-21-expression-contributes-to-arsenic-induced-skin-lesions-skin-cancers-and-respiratory-distress-in-chronically-exposed-individuals
#3
Nilanjana Banerjee, Apurba K Bandyopadhyay, Suman Dutta, Jayanta K Das, Tarit Roy Chowdhury, Arun Bandyopadhyay, Ashok K Giri
More than 26 million people in West Bengal, India, are exposed to arsenic through drinking water, leading to several deleterious endpoints including precancerous and cancerous skin lesions and other non-dermatological health effects. Here, our aim was to identify whether miR21 is associated with such dermatological and non-dermatological health outcomes in chronically exposed humans. A total of 123 subjects from West Bengal were recruited for this study (45 exposed individuals with skin lesions, 38 exposed individuals without skin lesions and 40 unexposed individuals)...
January 6, 2017: Toxicology
https://www.readbyqxmd.com/read/28068585/effects-of-phosphate-binders-on-the-gastrointestinal-absorption-of-arsenate-and-of-an-sglt2-inhibitor-drug-on-the-urinary-excretion-of-arsenite-in-mice
#4
Miklós Poór, Balázs Németi, Zoltán Gregus
Arsenate (As(V)) and arsenite (As(III)) are typical sources of acute and chronic arsenic poisoning. Therefore, reducing inner exposure to these arsenicals is a rational objective. Because As(V) mimics phosphate, phosphate binder drugs may decrease the intestinal As(V) absorption. Indeed, lanthanum and aluminium salts and sevelamer removed As(V) from solution in vitro, especially at acidic pH. In mice gavaged with As(V), lanthanum chloride, lanthanum carbonate and aluminium hydroxide given orally also lowered the urinary excretion and tissue levels of As(V) and its metabolites, indicating that they decreased the gastrointestinal As(V) absorption...
January 3, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28065543/mitigating-dietary-arsenic-exposure-current-status-in-the-united-states-and-recommendations-for-an-improved-path-forward
#5
Keeve E Nachman, Gary L Ginsberg, Mark D Miller, Carolyn J Murray, Anne E Nigra, Claire B Pendergrast
Inorganic arsenic (iAs) is a well-characterized carcinogen, and recent epidemiologic studies have linked chronic exposures to non-cancer health outcomes, including cardiovascular disease, diabetes, skin lesions and respiratory disorders. Greater vulnerability has been demonstrated with early life exposure for health effects including lung and bladder cancer, immunotoxicity and neurodevelopment. Despite its well-known toxicity, there are important gaps in the regulatory oversight of iAs in food and in risk communication...
January 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28061371/low-level-arsenic-exposure-via-drinking-water-consumption-and-female-fecundity-a-preliminary-investigation
#6
Michele L Susko, Michael S Bloom, Iulia A Neamtiu, Allison A Appleton, Simona Surdu, Cristian Pop, Edward F Fitzgerald, Doru Anastasiu, Eugen S Gurzau
High level arsenic exposure is associated with reproductive toxicity in experimental and observational studies; however, few data exist to assess risks at low levels. Even less data are available to evaluate the impact of low level arsenic exposure on human fecundity. Our aim in this pilot study was a preliminary evaluation of associations between low level drinking water arsenic contamination and female fecundity. This retrospective study was conducted among women previously recruited to a hospital-based case-control study of spontaneous pregnancy loss in Timiṣ County, Romania...
January 3, 2017: Environmental Research
https://www.readbyqxmd.com/read/28054265/assessment-of-arsenic-trioxide-in-the-heart-of-gallus-gallus-alterations-of-oxidative-damage-parameters-inflammatory-cytokines-and-cardiac-enzymes
#7
Si-Wen Li, Xiao Sun, Ying He, Ying Guo, Hong-Jing Zhao, Zhi-Jun Hou, Ming-Wei Xing
The aim of this study was to assess the effects of arsenic trioxide (As2O3) in the chicken heart, and 72 1-day-old male Hy-line chickens were fed either a commercial diet (C group) or an arsenic supplement diet containing 7.5 mg/kg (L group), 15 mg/kg (M group), or 30 mg/kg (H group) As2O3 for 90 days. The results showed that exposure to As2O3 merely lowered (P < 0.05) the activities of catalase (CAT) and glutathione peroxidase (GSH-Px) in M and H groups at 90 days, significantly downregulated the inhibition ability of hydroxyl radicals (OH·), and upregulated (P < 0...
January 4, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28044217/combined-toxicity-of-arsenite-and-dimethylarsenic-acid-on-the-freshwater-diatom-nitzschia-palea
#8
Tengda Ding, Jianying Zhang, Wanmin Ni, Juying Li
The toxicity and bioavailability of single arsenic species have been widely investigated, however, the biological effects of mixed arsenic species co-existing in natural waters still remain unknown. The objective of this work was to discern the adverse effects of combined arsenite (As(III)) and dimethylarsenic acid (DMA) on diatom Nitzschia palea. The combined ecotoxicity of As(III) and DMA on N. palea was observed to be time-dependent and showed dose-effect relation. The toxicity of DMA and As(III) mixture was higher than individual DMA or As(III) when the As(III) concentration was in the range of 0...
January 2, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28043702/understanding-arsenic-dynamics-in-agronomic-systems-to-predict-and-prevent-uptake-by-crop-plants
#9
Tracy Punshon, Brian P Jackson, Andrew A Meharg, Todd Warczack, Kirk Scheckel, Mary Lou Guerinot
This review is on arsenic in agronomic systems, and covers processes that influence the entry of arsenic into the human food supply. The scope is from sources of arsenic (natural and anthropogenic) in soils, biogeochemical and rhizosphere processes that control arsenic speciation and availability, through to mechanisms of uptake by crop plants and potential mitigation strategies. This review makes a case for taking steps to prevent or limit crop uptake of arsenic, wherever possible, and to work toward a long-term solution to the presence of arsenic in agronomic systems...
December 30, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/28040261/refinement-of-arsenic-attributable-health-risks-in-rural-pakistan-using-population-specific-dietary-intake-values
#10
Hifza Rasheed, Rebecca Slack, Paul Kay, Yun Yun Gong
BACKGROUND: Previous risk assessment studies have often utilised generic consumption or intake values when evaluating ingestion exposure pathways. If these values do not accurately reflect the country or scenario in question, the resulting risk assessment will not provide a meaningful representation of cancer risks in that particular country/scenario. OBJECTIVES: This study sought to determine water and food intake parameters for one region in South Asia, rural Pakistan, and assess the role population specific intake parameters play in cancer risk assessment...
December 28, 2016: Environment International
https://www.readbyqxmd.com/read/28029677/an-interesting-case-of-basal-cell-carcinoma-with-raynaud-s-phenomenon-following-chronic-arsenic-exposure
#11
S Gulshan, M J Rahman, R Sarkar, S Ghosh, R Hazra
Arsenic is commonly known to be associated with squamous cell carcinoma. Among the lesser known associations is basal cell carcinoma and even rarer is its effect on blood vessels causing peripheral vascular disease. Here we present a case of a 55 yr old man with ulceroproliferative lesions on scalp and forehead along with several hyperpigmented patches on trunk and extremities. He had symptoms suggestive of Raynaud's phenomenon that eventually led to digital gangrene. FNAC was done which was suggestive of basal cell carcinoma...
October 2016: JNMA; Journal of the Nepal Medical Association
https://www.readbyqxmd.com/read/28025110/hypomethylation-of-inflammatory-genes-cox2-egr1-and-socs3-and-increased-urinary-8-nitroguanine-in-arsenic-exposed-newborns-and-children
#12
Preeyaphan Phookphan, Panida Navasumrit, Somchamai Waraprasit, Jeerawan Promvijit, Krittinee Chaisatra, Thitirat Ngaotepprutaram, Mathuros Ruchirawat
Early-life exposure to arsenic increases risk of developing a variety of non-malignant and malignant diseases. Arsenic-induced carcinogenesis may be mediated through epigenetic mechanisms and pathways leading to inflammation. Our previous study reported that prenatal arsenic exposure leads to increased mRNA expression of several genes related to inflammation, including COX2, EGR1, and SOCS3. This study aimed to investigate the effects of arsenic exposure on promoter DNA methylation and mRNA expression of these inflammatory genes (COX2, EGR1, and SOCS3), as well as the generation of 8-nitroguanine, which is a mutagenic DNA lesion involved in inflammation-related carcinogenesis...
December 23, 2016: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28024743/human-exposure-to-organic-arsenic-species-from-seafood
#13
Vivien Taylor, Britton Goodale, Andrea Raab, Tanja Schwerdtle, Ken Reimer, Sean Conklin, Margaret R Karagas, Kevin A Francesconi
Seafood, including finfish, shellfish, and seaweed, is the largest contributor to arsenic (As) exposure in many human populations. In contrast to the predominance of inorganic As in water and many terrestrial foods, As in marine-derived foods is present primarily in the form of organic compounds. To date, human exposure and toxicological assessments have focused on inorganic As, while organic As has generally been considered to be non-toxic. However, the high concentrations of organic As in seafood, as well as the often complex As speciation, can lead to complications in assessing As exposure from diet...
December 23, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/28017702/arsenite-in-drinking-water-produces-glucose-intolerance-in-pregnant-rats-and-their-female-offspring
#14
María Marta Bonaventura, Nadia Soledad Bourguignon, Marianne Bizzozzero, Diego Rodriguez, Clara Ventura, Claudia Cocca, Carlos Libertun, Victoria Adela Lux-Lantos
Drinking water is the main source of arsenic exposure. Chronic exposure has been associated with metabolic disorders. Here we studied the effects of arsenic on glucose metabolism, in pregnant and post-partum of dams and their offspring. We administered 5 (A5) or 50 (A50) mg/L of sodium arsenite in drinking water to rats from gestational day 1 (GD1) until two months postpartum (2MPP), and to their offspring from weaning until 8 weeks old. Liver arsenic dose-dependently increased in arsenite-treated rats to levels similar to exposed population...
December 23, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28013460/arsenic-trioxide-induces-ros-activity-and-dna-damage-leading-to-g0-g1-extension-in-skin-fibroblasts-through-the-atm-atr-associated-chk-pathway
#15
Jutapon Chayapong, Harishkumar Madhyastha, Radha Madhyastha, Queen Intan Nurrahmah, Yuichi Nakajima, Narantsog Choijookhuu, Yoshitaka Hishikawa, Masugi Maruyama
Arsenic (As) toxicity is a global health problem, affecting millions of people. Exposure to arsenic, mostly via drinking water, has been associated with cancer of skin, lungs, and blood, in addition to several kinds of skin lesions. The present study focused on the effect of arsenic trioxide (As2O3) on normal skin fibroblast cells. Specifically, the effect of As2O3 on ROS generation and oxidative stress was investigated. Proteins involved in the DNA damage signaling pathway and cell cycle were also studied...
December 24, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28007985/dose-response-relationship-between-inorganic-arsenic-exposure-and-lung-cancer-among-arseniasis-residents-with-low-methylation-capacity
#16
Kuang-Hung Hsu, Ke-Hung Tsui, Ling-I Hsu, Hung-Yi Chiou, Chien-Jen Chen
Background Exposure to inorganic arsenic (InAs) has been documented as a risk factor for lung cancer. This study examined the association between InAs exposure, its metabolism, and lung cancer occurrence. Methods We followed 1300 residents from an arseniasis area in Taiwan, determined urinary InAs metabolites, and identified 39 lung cancer cases. Cox proportional hazard model was performed. Results The results demonstrated that participants with either the primary methylation index (monomethylarsonic acid [MMA]/InAs) or the secondary methylation index (dimethylarsinic acid[DMA]/MMA) lower than their respective median values were at a higher risk of lung cancer (hazard ratios from 3...
December 22, 2016: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28007638/immunotoxicological-effects-of-arsenic-bioaccumulation-on-spatial-metallomics-and-cellular-enzyme-response-in-the-spleen-of-male-wistar-rats-after-oral-intake
#17
Elio A Soria, Roberto D Pérez, Ignasi Queralt, Carlos A Pérez, Guillermina A Bongiovanni
Arsenic (As) is a worldwide environmental contaminant, which compromises immunity and causes various associated disorders. To further investigate its immunotoxicity, male Wistar rats were exposed to 100ppm of sodium arsenite (inorganic AsIII) in drinking water for 2 months. Given that metals are significant immune regulators, their content and distribution were analysed in spleen tissues, to then evaluate subsequent changes of redox enzyme responses in spleen parenchyma cells (splenocytes). X-ray fluorescence spectrometry demonstrated As accumulation in both white and red pulps (p<0...
January 15, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28007184/preliminary-studies-on-the-stability-of-arsenolipids-implications-for-sample-handling-and-analysis
#18
Muslim Khan, Kevin A Francesconi
Human health risk assessments concerning arsenic are now estimating exposure through food in addition to exposure through drinking water. Intrinsic to this assessment is sample handling and preparation that maintains the arsenic species in the form that they occur in foods. We investigated the stability of three arsenolipids (two arsenic fatty acids, AsFA-362 and AsFA-388, and one arsenic hydrocarbon AsHC-332), common constituents of fish and algae, relevant to sample storage and transport, and to their preparation for quantitative measurements...
November 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28007183/role-of-complex-organic-arsenicals-in-food-in-aggregate-exposure-to-arsenic
#19
REVIEW
David J Thomas, Karen Bradham
For much of the world's population, food is the major source of exposure to arsenic. Exposure to this non-essential metalloid at relatively low levels may be linked to a wide range of adverse health effects. Thus, evaluating foods as sources of exposure to arsenic is important in assessing risk and developing strategies that protect public health. Although most emphasis has been placed on inorganic arsenic as human carcinogen and toxicant, an array of arsenic-containing species are found in plants and animals used as foods...
November 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28007180/thiolated-arsenicals-in-arsenic-metabolism-occurrence-formation-and-biological-implications
#20
REVIEW
Yuzhen Sun, Guangliang Liu, Yong Cai
Arsenic (As) is a notoriously toxic pollutant of health concern worldwide with potential risk of cancer induction, but meanwhile it is used as medicines for the treatment of different conditions including hematological cancers. Arsenic can undergo extensive metabolism in biological systems, and both toxicological and therapeutic effects of arsenic compounds are closely related to their metabolism. Recent studies have identified methylated thioarsenicals as a new class of arsenic metabolites in biological systems after exposure of inorganic and organic arsenicals, including arsenite, dimethylarsinic acid (DMA(V)), dimethylarsinous glutathione (DMA(III)GS), and arsenosugars...
November 2016: Journal of Environmental Sciences (China)
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