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Developmental Toxicity

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https://www.readbyqxmd.com/read/28812058/environmental-pollutants-and-neurodevelopment-review-of-benefits-from-closure-of-a-coal-burning-power-plant-in-tongliang-china
#1
Vrinda Kalia, Frederica Perera, Deliang Tang
Background. Understanding preventable causes of neurodevelopmental disorders is a public health priority. Polycyclic aromatic hydrocarbons (PAH) from combustion of fossil fuel, lead, and mercury are among known neurodevelopmental toxicants. Method. For the first time, we comprehensively review the findings from a study by the Columbia Center for Children's Environmental Health and Chinese partners that followed 2 groups of mother-child pairs, one from 2002 and another from 2005, in Tongliang County, China. Pregnant mothers in the 2 cohorts experienced different exposure to PAH because a local coal-burning power plant was shut down in 2004...
2017: Global Pediatric Health
https://www.readbyqxmd.com/read/28808954/heavy-metal-pollutants-in-selected-organs-of-african-giant-rats-from-three-agro-ecological-zones-of-nigeria-evidence-for-their-role-as-an-environmental-specimen-bank
#2
Ifukibot Levi Usende, Benjamin O Emikpe, James Olukayode Olopade
An assessment of the concentration of heavy metals in the liver, brain, kidney, bone, and lungs of African giant rats (AGRs) from three agro-ecological zones of Nigeria having different industrial activities was carried out using atomic absorption spectrophotometer. Twenty adult AGRs from cities in mangrove/freshwater swamp, rainforest, and woodland/tall grass savanna agro-ecological zones of Nigeria were used for this study. AGRs were euthanized, carefully dissected, and the brains, liver, lungs, bone, and kidneys were harvested, digested, and analyzed for concentrations of vanadium (V), lead (Pb), cadmium (Cd), zinc (Zn), selenium (Se), copper (Cu), and iron (Fe)...
August 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28807754/transgenerational-effects-of-early-environmental-insults-on-aging-and-disease-incidence
#3
REVIEW
Mirela Ambeskovic, Tessa J Roseboom, Gerlinde A S Metz
Adverse early life experiences are major influences on developmental trajectories with potentially life-long consequences. Prenatal or early postnatal exposure to stress, undernutrition or environmental toxicants may reprogram brain development and increase risk of behavioural and neurological disorders later in life. Not only experience within a single lifetime, but also ancestral experience affects health trajectories and chances of successful aging. The central mechanism in transgenerational programming of a disease may the formation of epigenetic memory...
August 11, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28806688/concentration-dependent-transcriptome-responses-of-zebrafish-embryos-after-exposure-to-cadmium-cobalt-and-copper
#4
Laura Sonnack, Thorsten Klawonn, Ralf Kriehuber, Henner Hollert, Christoph Schäfers, Martina Fenske
Environmental metals are known to cause harmful effects to fish of which many molecular mechanisms still require elucidation. Particularly concentration dependence of gene expression effects is unclear. Focusing on this matter, zebrafish embryo toxicity tests were used in combination with transcriptomics. Embryos were exposed to three concentrations of copper (CuSO4), cadmium (CdCl2) and cobalt (CoSO4) from just after fertilization until the end of the 48hpf pre- and 96hpf post-hatch stage. The RNA was then analyzed on Agilent's Zebrafish (V3, 4×44K) arrays...
August 2, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/28801138/cadmium-exposure-in-newborn-rats-ovary-induces-developmental-disorders-of-primordial-follicles-and-the-differential-expression-of-scf-c-kit-gene
#5
Wenchang Zhang, Tingting Wu, Chenyun Zhang, Lingfeng Luo, Meimei Xie, Huiling Huang
Since the 1990s, the rising problem that gonad reproductive toxicity on adult female after exposing to cadmium (Cd), an environmental endocrine disruptor, has attracted high attention at home and abroad,and was systematically studied. Our research focuses on a further problem is that early cadmium exposure (during birth to before puberty) impact on development and function of ovarian cells and its possible mechanism. Our research focuses on the changes of ovarian cells growth and development after the newborn rat ovaries with cadmium exposure in vitro, and different expression of ovarian cells development-related factors, SCF/c-kit and changes of their DNA methylation status...
August 8, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28800614/optimization-of-recombinant-bacteria-expressing-dsrna-to-enhance-insecticidal-activity-against-a-lepidopteran-insect-spodoptera-exigua
#6
Mohammad Vatanparast, Yonggyun Kim
Double-stranded RNA (dsRNA) has been applied to control insect pests due to its induction of RNA interference (RNAi) of a specific target gene expression. However, developing dsRNA-based insecticidal agent has been a great challenge especially against lepidopteran insect pests due to variations in RNAi efficiency. The objective of this study was to screen genes of chymotrypsins (SeCHYs) essential for the survival of the beet armyworm, Spodoptera exigua, to construct insecticidal dsRNA. In addition, an optimal oral delivery method was developed using recombinant bacteria...
2017: PloS One
https://www.readbyqxmd.com/read/28800472/phthalate-and-bisphenol-a-exposure-during-in-utero-windows-of-susceptibility-in-relation-to-reproductive-hormones-and-pubertal-development-in-girls
#7
Deborah J Watkins, Brisa N Sánchez, Martha Maria Téllez-Rojo, Joyce M Lee, Adriana Mercado-García, Clara Blank-Goldenberg, Karen E Peterson, John D Meeker
BACKGROUND: Over the past several decades, the age of pubertal onset in girls has shifted downward worldwide. As early pubertal onset is associated with increased risky behavior and psychological issues during adolescence and cardiometabolic disease and cancer in adulthood, this is an important public health concern. Exposure to endocrine disrupting chemicals during critical windows of in utero development may play a role in this trend. Our objective was to investigate trimester-specific phthalate and BPA exposure in relation to pubertal development among girls in the Early Life Exposure in Mexico to Environmental Toxicants (ELEMENT) birth cohort...
August 8, 2017: Environmental Research
https://www.readbyqxmd.com/read/28800408/effects-of-phenanthrene-on-early-development-of-the-pacific-oyster-crassostrea-gigas-thunberg-1789
#8
Diego J Nogueira, Jacó J Mattos, Patrick R Dybas, Fabrıcio Flores-Nunes, Silvio Tarou Sasaki, Satie Taniguchi, Éder C Schmidt, Zenilda L Bouzon, Márcia C Bícego, Claudio M R Melo, Guilherme Toledo-Silva, Afonso C D Bainy
Phenanthnere (PHE) is a polycyclic aromatic hydrocarbon continuously discarded in the marine environment and bioavailable to many aquatic species. Although studies about PHE toxicity have been documented for adult oysters, the effects on early developmental stages are poorly characterized in bivalves. In this study, the effects of PHE (0.02 and 2.0μg.L(-1)) were evaluated on the embryogenesis and larval development of Crassostrea gigas. Toxicity bioassays, growth and deformities assessment, analysis of shell calcium abundance and transcript levels of genes related to xenobiotic biotransformation (CYP2AU2, CYP30C1), immune system (Cg-Tal) and tissue growth and shell formation (Ferritin, Insulin-like, Cg-Try, Calmodulin and Nacrein) were assayed in D-shape larvae after 24h of PHE exposure...
August 1, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28800395/using-chemistry-to-target-neuroblastoma
#9
Jeanne N Hansen, Xingguo Li, Y George Zheng, Louis T Lotta, Abhishek Dedhe, Nina F Schor
Neuroblastoma is a cancer of the neural crest almost exclusively seen in childhood. While children with single, small primary tumors are often cured with surgery alone, the 65% of children with neuroblastoma whose disease has metastasized have less than a 50% chance of surviving five years after diagnosis. Innovative pharmacological strategies are critically needed for these children. Efforts to identify novel targets that afford ablation of neuroblastoma with minimal toxicity to normal tissues are underway...
August 11, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28794394/review-of-toxicity-studies-of-carbon-nanotubes
#10
Norihiro Kobayashi, Hiroto Izumi, Yasuo Morimoto
OBJECTIVE: We reviewed studies on pulmonary, reproductive, and developmental toxicity caused by carbon nanotubes (CNTs). In paricular, we analyzed how CNT exposure affects the several processes of pulmonary toxicity, including inflammation, injury, fibrosis, and pulmonary tumors. METHODS: In pulmonary toxicity, there are various processes, including inflammation, injury, fibrosis, respiratory tumor in the lungs, and biopersistence of CNTs and genotoxicity as tumor-related factors, to develop the respiratory tumor...
August 8, 2017: Journal of Occupational Health
https://www.readbyqxmd.com/read/28793200/fasd-folic-acid-and-formic-acid-an-unholy-alliance-in-the-alcohol-abusing-mother
#11
Bhushan M Kapur, Marta Baber
Alcohol consumption during pregnancy remains a significant cause of preventable birth defects and developmental disabilities, however, the mechanism of toxicity remains unclear. Methanol is present as a congener in many alcoholic beverages and is formed endogenously. Since ethanol is preferentially metabolized over methanol, it has been found in the sera and CSF of alcoholics. Toxicity resulting from methanol has been attributed to formic acid. Formic acid is present in significantly higher quantities in biofluids of alcoholic patients...
August 9, 2017: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/28792110/toxicity-of-extracts-from-municipal-wastewater-to-early-life-stages-of-japanese-medaka-oryzias-latipes-to-evaluate-removals-of-micropollutants-by-wastewater-treatment
#12
Nicholas Maya, Calvin Crispo, Victoria McFarland, Deniz Nasuhoglu, Siavash Isazadeh, Viviane Yargeau, Chris D Metcalfe
Treatment of municipal wastewater reduces the concentrations of some pharmaceuticals and personal care products, hormones and drugs of abuse. However, reduced concentrations of these micropollutants in wastewater may not correlate with reduced toxicity, as transformations of micropollutants and/or the formation of disinfection by-products may generate toxic compounds. In this study, we prepared extracts by solid phase extraction of samples collected from wastewater treatment plants (WWTPs) at various stages of treatment and tested these extracts for toxicity to early life stages of Japanese medaka (Oryzias latipes)...
August 9, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28791702/developmental-neurotoxicity-of-the-organophosphorus-insecticide-chlorpyrifos-from-clinical-findings-to-preclinical-models-and-potential-mechanisms
#13
REVIEW
Richard D Burke, Spencer W Todd, Eric Lumsden, Roger J Mullins, Jacek Mamczarz, William P Fawcett, Rao P Gullapalli, William R Randall, Edna F R Pereira, Edson X Albuquerque
Organophosphorus (OP) insecticides are pest-control agents heavily used worldwide. Unfortunately, they are also well known for the toxic effects that they can trigger in humans. Clinical manifestations of an acute exposure of humans to OP insecticides include a well-defined cholinergic crisis that develops as a result of the irreversible inhibition of acetylcholinesterase (AChE), the enzyme that hydrolyzes the neurotransmitter acetylcholine (ACh). Prolonged exposures to levels of OP insecticides that are insufficient to trigger signs of acute intoxication, which are hereafter referred to as subacute exposures, have also been associated with neurological deficits...
August 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28789970/mitochondrial-fusion-fission-and-mitochondrial-toxicity
#14
Joel N Meyer, Tess C Leuthner, Anthony L Luz
Mitochondrial dynamics are regulated by two sets of opposed processes: mitochondrial fusion and fission, and mitochondrial biogenesis and degradation (including mitophagy), as well as processes such as intracellular transport. These processes maintain mitochondrial homeostasis, regulate mitochondrial form, volume and function, and are increasingly understood to be critical components of the cellular stress response. Mitochondrial dynamics vary based on developmental stage and age, cell type, environmental factors, and genetic background...
August 5, 2017: Toxicology
https://www.readbyqxmd.com/read/28780348/integration-of-in-silico-approaches-to-determination-of-endocrine-disrupting-perfluorinated-chemicals-binding-potency-with-steroidogenic-acute-regulatory-protein
#15
K Kranthi Kumar, B Uma Devi, P Neeraja
A myriad of perfluorinated compounds (PFCs) have the ability to interfere with steroidogenic acute regulatory (StAR) protein. Consequently, PFCs breaches cholesterol biotransformation in mitochondria and cause fatal consequences in steroidogenesis however, these were poorly characterized. In the present study, we have evaluated toxic potencies, nuclear mediated probabilities and interaction profiles with StAR of PFCs using computational system biology tools. Toxicity endpoints revealed that PFCs contain high carcinogenicity, developmental toxicity, skin sensitization effects with low mutagenic activity...
August 2, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28777041/acute-hydrogen-peroxide-h2o2-exposure-does-not-cause-oxidative-stress-in-late-copepodite-stage-of-calanus-finmarchicus
#16
Bjørn Henrik Hansen, Anna Hallmann, Dag Altin, Bjørn Munro Jenssen, Tomasz M Ciesielski
Use of hydrogen peroxide (H2O2) for removal of salmon lice in the aquaculture industry has created concern that non-target organisms might be affected during treatment scenarios. The aim of the present study was to examine the potential for H2O2 to produce oxidative stress and reduce survival in one of the most abundant zooplankton species in Norwegian coastal areas, the copepod Calanus finmarchicus. Copepods were subjected to two 96-hr tests: (1) acute toxicity test where mortality was determined and (2) treated copepods were exposed to concentrations below the No Observed Effect Concentration (0...
August 4, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28774629/characterization-of-halogenated-dbps-and-identification-of-new-dbps-trihalomethanols-in-chlorine-dioxide-treated-drinking-water-with-multiple-extractions
#17
Jiarui Han, Xiangru Zhang, Jiaqi Liu, Xiaohu Zhu, Tingting Gong
Chlorine dioxide (ClO2) is a widely used alternative disinfectant due to its high biocidal efficiency and low-level formation of trihalomethanes and haloacetic acids. A major portion of total organic halogen (TOX), a collective parameter for all halogenated DBPs, formed in ClO2-treated drinking water is still unknown. A commonly used pretreatment method for analyzing halogenated DBPs in drinking water is one-time liquid-liquid extraction (LLE), which may lead to a substantial loss of DBPs prior to analysis...
August 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28774622/method-to-assess-component-contribution-to-toxicity-of-complex-mixtures-assessment-of-puberty-acquisition-in-rats-exposed-to-disinfection-byproducts
#18
Shahid Parvez, Glenn E Rice, Linda K Teuschler, Jane Ellen Simmons, Thomas F Speth, Susan D Richardson, Richard J Miltner, E Sidney Hunter, Jonathan G Pressman, Lillian F Strader, Gary R Klinefelter, Jerome M Goldman, Michael G Narotsky
A method based on regression modeling was developed to discern the contribution of component chemicals to the toxicity of highly complex, environmentally realistic mixtures of disinfection byproducts (DBPs). Chemical disinfection of drinking water forms DBP mixtures. Because of concerns about possible reproductive and developmental toxicity, a whole mixture (WM) of DBPs produced by chlorination of a water concentrate was administered as drinking water to Sprague-Dawley (S-D) rats in a multigenerational study...
August 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28774621/zebrafish-embryo-toxicity-of-15-chlorinated-brominated-and-iodinated-disinfection-by-products
#19
David Hanigan, Lisa Truong, Michael Simonich, Robert Tanguay, Paul Westerhoff
Disinfection to protect human health occurs at drinking water and wastewater facilities through application of non-selective oxidants including chlorine. Oxidants also transform organic material and form disinfection by-products (DBPs), many of which are halogenated and cyto- and genotoxic. Only a handful of assays have been used to compare DBP toxicity, and researchers are unsure which DBP(s) drive the increased cancer risk associated with drinking chlorinated water. The most extensive data set employs an in vitro model cell, Chinese hamster ovary cells...
August 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28774157/the-potential-liver-brain-and-embryo-toxicity-of-titanium-dioxide-nanoparticles-on-mice
#20
Xiaochuan Jia, Shuo Wang, Lei Zhou, Li Sun
Nanoscale titanium dioxide (nano-TiO2) has been widely used in industry and medicine. However, the safety of nano-TiO2 exposure remains unclear. In this study, we evaluated the liver, brain, and embryo toxicity and the underlying mechanism of nano-TiO2 using mice models. The results showed that titanium was distributed to and accumulated in the heart, brain, spleen, lung, and kidney of mice after intraperitoneal (i.p.) nano-TiO2 exposure, in a dose-dependent manner. The organ/body weight ratios of the heart, spleen, and kidney were significantly increased, and those of the brain and lung were decreased...
December 2017: Nanoscale Research Letters
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