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Neurotoxicology

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https://www.readbyqxmd.com/read/27899305/low-signal-intensity-on-mri-in-the-globus-pallidus-in-children-with-long-term-oral-manganese-exposure
#1
LETTER
Luisa Chiapparini, Paolo D Pigatto, Gianpaolo Guzzi
No abstract text is available yet for this article.
November 27, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27899304/caffeine-for-apnea-of-prematurity-effects-on-the-developing-brain
#2
REVIEW
Anzari Atik, Richard Harding, Robert De Matteo, Delphi Kondos-Devcic, Jeanie Cheong, Lex W Doyle, Mary Tolcos
Caffeine is a methylxanthine that is widely used to treat apnea of prematurity (AOP). In preterm infants, caffeine reduces the duration of respiratory support, improves survival rates and lowers the incidence of cerebral palsy and cognitive delay. There is, however, little evidence relating to the immediate and long-term effects of caffeine on brain development, especially at the cellular and molecular levels. Experimental data are conflicting, with studies showing that caffeine can have either adverse or benefical effects in the developing brain...
November 27, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27894698/dual-effects-of-eugenol-on-the-neuronal-excitability-an-in-vitro-study
#3
Jafar Vatanparast, Samira Khalili, Maryam Naseh
Besides its well-known actions on sensory afferents, eugenol also affects general excitability of the nervous system, but the mechanisms involved in the recent effect, especially through modulation of ion channels, have received much less attention. In this study, we studied the effects of eugenol on the excitability of central neurons of land snail Caucasotachea atrolabiata and tried to elucidate the underlying ionic mechanisms. The lower concentration of eugenol (0.5mM) reversibly reduced the frequency of spontaneous action potentials that was associated with elevation of threshold, reduction of maximum slope of rising phase and prolongation of actin potentials...
November 25, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27888119/prenatal-phthalate-triclosan-and-bisphenol-a-exposures-and-child-visual-spatial-abilities
#4
Joseph M Braun, David C Bellinger, Russ Hauser, Robert O Wright, Aimin Chen, Antonia M Calafat, Kimberly Yolton, Bruce P Lanphear
INTRODUCTION: During fetal development, sex steroids influence sexually dimorphic behaviors, such as visual-spatial abilities. Thus, endocrine disrupting chemicals that impact sex steroids during gestation may affect these behaviors. OBJECTIVE: We investigated the relationship between prenatal urinary phthalate metabolite, triclosan, and BPA concentrations and visual-spatial abilities in a prospective cohort of 198 mother-child dyads. METHODS: Data are from a prospective cohort in Cincinnati, OH (HOME Study)...
November 23, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27888120/gestational-exposure-to-perfluorooctanoic-acid-pfoa-alterations-in-motor-related-behaviors
#5
David R Goulding, Sally S White, Sandra J McBride, Suzanne E Fenton, G Jean Harry
Perfluoroalkyl and polyfluoroalkyl substances are used in commercial applications and developmental exposure has been implicated in alterations in neurobehavioral functioning. While associations between developmental perfluorooctanoic acid (PFOA) exposure and human outcomes have been inconsistent, studies in experimental animals suggest alterations in motor related behaviors. To examine a dose-response pattern of neurobehavioral effects following gestational exposure to PFOA, pregnant CD-1 mice received PFOA (0, 0...
November 22, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27880872/manganese-showcase-symposium
#6
EDITORIAL
Donald R Mattison, Len Levy, Doreen McGough
No abstract text is available yet for this article.
November 20, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27871916/association-of-neurobehavioral-performance-with-r2-in-the-caudate-nucleus-of-asymptomatic-welders
#7
Eun-Young Lee, Paul J Eslinger, Michael R Flynn, Daymond Wagner, Guangwei Du, Mechelle M Lewis, Lan Kong, Richard B Mailman, Xuemei Huang
OBJECTIVES: Welding fumes contain several metals including manganese (Mn) and iron (Fe) that may affect the nervous system. Previous studies of potential welding-related neurotoxicity have focused primarily on Mn exposure. The current study examined neurobehavioral and brain imaging changes in asymptomatic welders and their associations with both Mn and Fe exposure measurements. METHODS: Data were obtained from subjects with (n=46) and without (controls; n=31) a history of welding exposure...
November 18, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27866991/parkinson-s-disease-like-motor-and-non-motor-symptoms-in-rotenone-treated-zebrafish
#8
Yali Wang, Wenwen Liu, Jing Yang, Fen Wang, Yizhen Sima, Zhao-Min Zhong, Han Wang, Li-Fang Hu, Chun-Feng Liu
The pesticide rotenone is widely used to produce Parkinson's disease (PD)-like symptoms in rodents, but few studies have examined whether rotenone-treated zebrafish can serve as an animal model of PD. Here, we report that 4 weeks of rotenone treatment induced motor and non-motor PD-like symptoms in adult zebrafish. Compared with control fish, rotenone-treated fish spent less time swimming at a fast speed, indicating a deficit in motor function. In the light-dark box test, rotenone-treated fish exhibited longer latencies to enter the dark compartment and spent more time in the light compartment, reflecting anxiety- and depression-like behavior...
November 17, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27865828/associations-between-former-exposure-to-manganese-and-olfaction-in-an-elderly-population-results-from-the-heinz-nixdorf-recall-study
#9
Swaantje Casjens, Beate Pesch, Sibylle Robens, Benjamin Kendzia, Thomas Behrens, Tobias Weiss, Nadin Ulrich, Marina Arendt, Lewin Eisele, Noreen Pundt, Anja Marr, Christoph van Thriel, Rainer Van Gelder, Michael Aschner, Susanne Moebus, Nico Dragano, Karl-Heinz Jöckel, Thomas Brüning
Occupational exposure to manganese (Mn) has been associated with impairments in olfaction and motor functions, but it has yet to be determined if such effects persist upon cessation of exposure. The objective of this study was to evaluate the influence of former occupational Mn exposure on olfaction within the framework of a prospective cohort study among an elderly German population. Information on job tasks with recognized Mn exposure and data on odor identification assessed with Sniffin' sticks was collected during the second follow-up of the Heinz Nixdorf Recall Study...
November 16, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27851901/exposure-to-ambient-ultrafine-particulate-matter-alters-the-expression-of-genes-in-primary-human-neurons
#10
Parrisa Solaimani, Arian Saffari, Constantinos Sioutas, Stephen C Bondy, Arezoo Campbell
Exposure to ambient particulate matter (PM) has been associated with the onset of neurodevelopmental and neurodegenerative disorders, but the mechanism of toxicity remains unclear. To gain insight into this neurotoxicity, this study sought to examine global gene expression changes caused by exposure to ambient ultrafine PM. Microarray analysis was performed on primary human neurons derived from fetal brain tissue after a 24h exposure to 20μg/mL of ambient ultrafine particles. We found a majority of the changes in noncoding RNAs, which are involved in epigenetic regulation of gene expression, and thereby could impact the expression of several other protein coding gene targets...
November 13, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27825840/environmental-toxicology-sensitive-periods-of-development-and-neurodevelopmental-disorders
#11
REVIEW
Djai B Heyer, Rhiannon M Meredith
Development of the mammalian central nervous system is a complex process whose disruption may have severe and long-lasting consequences upon brain structure and function, potentially resulting in a neurodevelopmental disorder (NDD). Many NDDs are known to be genetic in origin, with symptom onset and their underlying mechanisms now known to be regulated during time-dependent windows or 'critical periods' during normal brain development. However, it is increasingly evident that similar disturbances to the developing nervous system may be caused by exposure to non-genetic, environmental factors...
November 4, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27816614/developmental-exposure-to-an-environmental-pcb-mixture-delays-the-propagation-of-electrical-kindling-from-the-amygdala
#12
Suren B Bandara, Renee N Sadowski, Susan L Schantz, Mary E Gilbert
Developmental PCB exposure impairs hearing and induces brainstem audiogenic seizures in adult offspring. The degree to which this enhanced susceptibility to seizure is manifest in other brain regions has not been examined. Thus, electrical kindling of the amygdala was used to evaluate the effect of developmental exposure to an environmentally relevant PCB mixture on seizure susceptibility in the rat. Female Long-Evans rats were dosed orally with 0 or 6mg/kg/day of the PCB mixture dissolved in corn oil vehicle 4 weeks prior to mating and continued through gestation and up until postnatal day (PND) 21...
November 2, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27816613/tris-1-3-dichloro-2-propyl-phosphate-induced-apoptotic-signaling-pathways-in-sh-sy5y-neuroblastoma-cells
#13
Ruiwen Li, Peijiang Zhou, Yongyong Guo, Jae-Seong Lee, Bingsheng Zhou
Tris (1, 3-dichloro-2-propyl) phosphate (TDCIPP, also known as TDCPP), an extensively used flame retardant, is frequently detected in the environment and biota. Recent studies have shown that TDCIPP has neurotoxic effects. In this study, we determined the mechanisms of TDCIPP-induced neurotoxicity in human neuroblastoma (SH-SY5Y) cells. By using morphological examination, flow cytometry, and mitochondrial membrane potential (ΔYm) measurement, we confirmed that exposure to TDCIPP caused apoptosis accompanied by the activation of apoptosis-related genes (e...
November 2, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27793617/galanthamine-decreases-genotoxicity-and-cell-death-induced-by-%C3%AE-amyloid-peptide-in-sh-sy5y-cell-line
#14
Willian O Castillo, Andrés F Aristizabal-Pachon, Ana P de Lima Montaldi, Elza T Sakamoto-Hojo, Catarina S Takahashi
Biochemically, Alzheimeŕs disease (AD) is characterized by the presence of abnormal deposition of beta amyloid peptide (Aβ(1-42)), which is generated by proteolytic processing from its precursor, the amyloid precursor protein (APP) in a non-physiological pathway. The presence of Aβ(1-42) in the brain is strongly correlated with cognitive impairment, cholinergic deficiency, bioenergetics disruption, cell death and DNA damage. Galanthamine is an acetylcholinesterase inhibitor (AChEI) used to symptomatic treatment of Alzheimeŕs disease (AD)...
October 25, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27777102/atypical-microglial-response-to-biodiesel-exhaust-in-healthy-and-hypertensive-rats
#15
Christen L Mumaw, Michael Surace, Shannon Levesque, Urmila P Kodavanti, Prasada Rao S Kodavanti, Joyce E Royland, Michelle L Block
Accumulating evidence suggests a deleterious role for urban air pollution in central nervous system (CNS) diseases and neurodevelopmental disorders. Microglia, the resident innate immune cells and sentinels in the brain, are a common source of neuroinflammation and are implicated in air pollution-induced CNS effects. While renewable energy, such as soy-based biofuel, is of increasing public interest, there is little information on how soy biofuel may affect the brain, especially in people with preexisting disease conditions...
October 21, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27769869/alterations-in-mrna-and-protein-expression-of-glutamate-transporters-in-rat-hippocampus-after-paraoxon-exposure
#16
Moslem Mohammadi, Zohreh Zare, Esmaeil Allah-Moradi, Narges Vaezi, Reza Valadan, Mohsen Tehrani
Organophosphates affect brain function through a variety of mechanisms beyond their shared role as cholinesterase inhibitors. The aim of the current study was to investigate the changes in the expression of glial (GLAST and GLT-1) and neuronal (EAAC1) glutamate transporters at mRNA and protein levels in paraoxon-treated rat hippocampus. Adult male Wistar rats were intraperitoneally treated with either vehicle (corn oil) or one of three dosages of paraoxon (0.3, 0.7 or 1mg/kg). After 4 or 18h, both hippocampi of each rat were collected to detect mRNA and protein expression of glutamate transporters using the quantitative reverse transcriptase polymerase chain reaction (qRT-PCR) and western blotting, respectively...
October 18, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27746125/berberine-protects-against-memory-impairment-and-anxiogenic-like-behavior-in-rats-submitted-to-sporadic-alzheimer-s-like-dementia-involvement-of-acetylcholinesterase-and-cell-death
#17
Juliana Sorraila de Oliveira, Fátima Husein Abdalla, Guilherme Lopes Dornelles, Stephen Adeniyi Adefegha, Taís Vidal Palma, Cristiane Signor, Jamile da Silva Bernardi, Jucimara Baldissarelli, Luana Suéling Lenz, Luana Pereira Magni, Maribel Antonello Rubin, Micheli Mainardi Pillat, Cinthia Melazzo de Andrade
The present study aimed to investigate the effects of berberine (BRB) on spatial and learning memory, anxiety, acetylcholinesterase activity and cell death in an experimental model of intracerebroventricular streptozotocin (ICV-STZ) induced sporadic Alzheimer's-like dementia. Sixty male Wistar rats were randomly divided into six groups: control (CTR), BRB 50mg/kg (BRB 50), BRB 100mg/kg (BRB 100), streptozotocin (STZ), streptozotocin plus BRB 50mg/kg (STZ+BRB 50), and streptozotocin plus BRB 100mg/kg (STZ+BRB 100)...
October 13, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27746124/in-vitro-evaluation-of-pyrethroid-mediated-changes-on-neuronal-burst-parameters-using-microelectrode-arrays
#18
Baskar Mohana Krishnan, Balakrishna Murthy Prakhya
Effects of pyrethroids (beta-cyfluthrin, bifenthrin, cypermethrin, deltamethrin, lambda-cyhalothrin, and permethrin) on the burst parameters (mean burst rate [MBR], percent spikes in burst [PSB], mean burst duration [MBD], mean spikes in burst [MSB], mean interspike interval in burst [MISIB], and mean interburst interval [MIBI]) have been investigated using the microelectrode array technique. Rat cortical neuronal networks (between 24 and 35 DIV) were exposed to the five accumulative concentrations of pyrethroids (0...
October 13, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27737812/solvent-neurotoxicity-in-vehicle-collision-repair-workers-in-new-zealand
#19
Samuel Keer, Bill Glass, Bradley Prezant, David McLean, Neil Pearce, Elizabeth Harding, Diana Echeverria, James McGlothlin, Duncan R Babbage, Jeroen Douwes
OBJECTIVES: To assess whether solvent use and workplace practices in the vehicle collision repair industry are associated with symptoms of neurotoxicity in spray painters and panel beaters (auto body repair workers). METHODS: Neurobehavioural symptoms were assessed using a cross-sectional study design in 370 vehicle collision repair and 211 reference workers using the EUROQUEST questionnaire. Full-shift airborne solvent levels were measured in a subset (n=92) of collision repair workers...
October 11, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27737811/effects-of-manganese-exposure-on-visuoperception-and-visual-memory-in-schoolchildren
#20
D Hernández-Bonilla, C Escamilla-Núñez, D Mergler, S Rodríguez-Dozal, M Cortez-Lugo, S Montes, L A Tristán-López, M Catalán-Vázquez, A Schilmann, Horacio Riojas-Rodriguez
BACKGROUND: Manganese (Mn) is an essential metal involved in multiple physiological functions. Environmental exposure to airborne Mn is associated with neurocognitive deficits in humans. Children, whose nervous system is in development, are particularly susceptible to Mn neurotoxicity. OBJECTIVE: The objective of this study was to assess the association between Mn environmental exposure, and effects on visuoperception and visual memory in schoolchildren. METHODS: We assessed schoolchildren between 7 and 11 years old, with similar socioeconomic status, from the mining district of Molango (n=148) and Agua Blanca (n=119, non-mining area) in Hidalgo state, Mexico...
October 11, 2016: Neurotoxicology
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