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https://www.readbyqxmd.com/read/27908630/non-linear-dose-response-of-aluminium-hydroxide-adjuvant-particles-selective-low-dose-neurotoxicity
#1
Guillemette Crépeaux, Housam Eidi, Marie-Odile David, Yasmine Baba-Amer, Eleni Tzavara, Bruno Giros, François-Jérôme Authier, Christopher Exley, Christopher A Shaw, Josette Cadusseau, Romain K Gherardi
Aluminium (Al) oxyhydroxide (Alhydrogel(®)), the main adjuvant licensed for human and animal vaccines, consists of primary nanoparticles that spontaneously agglomerate. Concerns about its safety emerged following recognition of its unexpectedly long-lasting biopersistence within immune cells in some individuals, and reports of chronic fatigue syndrome, cognitive dysfunction, myalgia, dysautonomia and autoimmune/inflammatory features temporally linked to multiple Al-containing vaccine administrations. Mouse experiments have documented its capture and slow transportation by monocyte-lineage cells from the injected muscle to lymphoid organs and eventually the brain...
November 28, 2016: Toxicology
https://www.readbyqxmd.com/read/27888371/protective-effect-of-the-sulfated-agaran-isolated-from-the-red-seaweed-laurencia-aldingensis-against-toxic-effects-of-the-venom-of-the-snake-lachesis-muta
#2
Ana Cláudia Rodrigues da Silva, Luciana Garcia Ferreira, Maria Eugênia Rabello Duarte, Mutue Toyota Fujii, Eladio Flores Sanchez, Miguel Daniel Noseda, André Lopes Fuly
Snakebite is a serious occupational hazard affecting mainly rural populations of tropical and subtropical developing countries. Lachesis muta (Bushmaster) bites are extremely serious but are rarely reported in the literature. Bushmaster envenomings are characterized by intense local pain, edema, neurotoxicity, hypotension, local hemorrhage, and dramatic systemic alterations. Antivenom treatment has regularly been used for more than a century; however, it fails to neutralize local tissue damage and hemorrhage, leading to morbidity or disabilities in victims...
November 25, 2016: Marine Biotechnology
https://www.readbyqxmd.com/read/27871551/exposure-to-anesthetic-gases-among-operating-room-personnel-and-risk-of-genotoxicity-a-systematic-review-of-the-human-biomonitoring-studies
#3
REVIEW
Serkan Yılmaz, Nazan Çakırer Çalbayram
BACKGROUND AND OBJECTIVE: Anesthetic gases have been used for a long time. Adverse effects of anesthetic gases to occupationally exposed people have been well documented in the literature. Due to low solubility, these gases are rapidly eliminated from the human body. Nevertheless, neurotoxic, immunosuppressive, hepatotoxic and reproductive toxicological effects have been shown in many of the scientific works. However, there is no detailed systematic bio-monitoring review about genotoxicity risk among occupationally exposed people...
December 2016: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/27865525/maternal-stress-modifies-the-effect-of-exposure-to-lead-during-pregnancy-and-24-month-old-children-s-neurodevelopment
#4
Marcela Tamayo Y Ortiz, Martha María Téllez-Rojo, Belem Trejo-Valdivia, Lourdes Schnaas, Erika Osorio-Valencia, Brent Coull, David Bellinger, Rosalind J Wright, Robert O Wright
BACKGROUND: Lead and psychosocial stress disrupt similar but not completely overlapping mechanisms. Exposure during the prenatal period to each of these insults singularly has been found to alter normal neurodevelopment; however, longitudinal associations with stress modifying the effect of lead have not been sufficiently analyzed in epidemiologic studies. OBJECTIVE: To evaluate prenatal stress as an effect modifier of gestational lead neurotoxicity. METHODS: We used a structural equations modeling approach with a trivariate response to evaluate cognitive, language and motor scores of the Bayley Scales of Infant Development-III in 24month-old children (n=360)...
November 16, 2016: Environment International
https://www.readbyqxmd.com/read/27853314/imprinting-of-cerebral-cytochrome-p450s-in-offsprings-prenatally-exposed-to-cypermethrin-augments-toxicity-on-rechallenge
#5
Anshuman Singh, Anita Agrahari, RadhaDutt Singh, Sanjay Yadav, Vikas Srivastava, Devendra Parmar
Epigenetic studies were carried in the rat offsprings, born to dams treated with cypermethrin (orally; 5.0 mg/kg) from gestation day (GD) 5 to 21 and rechallenged with cypermethrin (orally; 10 mg/kg for 6 days), at adulthood (12 weeks) to understand the mechanism underlying the overexpression of cerebral cytochrome P450s (CYPs) in exposed offsprings. The data revealed alterations in histone H3 acetylation and DNA methylation in promoter regions of CYP1A- and 2B- isoenzymes in the brain isolated from rechallenged animals...
November 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27847309/an-optimized-method-to-assess-ototoxic-effects-in-the-lateral-line-of-zebrafish-danio-rerio-embryos
#6
Daniel Stengel, Florian Zindler, Thomas Braunbeck
In order to clarify the suitability of the lateral line of zebrafish (Danio rerio) embryos as a model for the screening of ototoxic (neurotoxic) effects, existing neuromast assays were adapted, improved and validated with a series of chemicals known or unknown for their ototoxic potential (caffeine copper sulfate, dichlorvos, 2.4-dinitrotoluene, neomycin, 4-nonylphenol, perfluorooctanesulfonic acid). Present methods were improved by (1) the introduction of a 4-step scoring system, (2) the selection of neuromasts from both the anterior and posterior lateral line systems, (3) a combined DASPEI/DAPI staining applied after both a continuous and pulse exposure scenario, and (4) an additional screening for nuclear fragmentation...
November 12, 2016: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/27830420/organophosphate-hydrolyzing-enzymes-as-first-line-of-defence-against-nerve-agent-poisoning-perspectives-and-the-road-ahead
#7
REVIEW
A R Satvik Iyengar, Abhay H Pande
Nerve agents (NAs) are extremely neurotoxic synthetic organophosphate (OP) compounds exploited as weapons of mass destruction in terrorist attacks and chemical warfare. Considering the current world scenario, there is a persistent threat of NA-exposure to military personals and civilians. Various prophylactic and post-exposure treatments (such as atropine and oximes) available currently for NA-poisoning are inadequate and unsatisfactory and suffer from severe limitations. Hence, developing safe and effective treatment(s) against NA-poisoning is a critical necessity...
December 2016: Protein Journal
https://www.readbyqxmd.com/read/27826410/elemental-analysis-of-scorpion-venoms
#8
AbdulRahman K Al-Asmari, Faisal Kunnathodi, Khalid Al Saadon, Mohammed M Idris
Scorpion venom is a rich source of biomolecules, which can perturb physiological activity of the host on envenomation and may also have a therapeutic potential. Scorpion venoms produced by the columnar cells of venom gland are complex mixture of mucopolysaccharides, neurotoxic peptides and other components. This study was aimed at cataloguing the elemental composition of venoms obtained from medically important scorpions found in the Arabian peninsula. The global elemental composition of the crude venom obtained from Androctonus bicolor, Androctonus crassicauda and Leiurus quinquestriatus scorpions were estimated using ICP-MS analyzer...
2016: Journal of Venom Research
https://www.readbyqxmd.com/read/27825840/environmental-toxicology-sensitive-periods-of-development-and-neurodevelopmental-disorders
#9
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/27819338/quinolinic-acid-injection-in-mouse-medial-prefrontal-cortex-affects-reversal-learning-abilities-cortical-connectivity-and-hippocampal-synaptic-plasticity
#10
Amira Latif-Hernandez, Disha Shah, Tariq Ahmed, Adrian C Lo, Zsuzsanna Callaerts-Vegh, Annemie Van der Linden, Detlef Balschun, Rudi D'Hooge
Intracerebral injection of the excitotoxic, endogenous tryptophan metabolite, quinolinic acid (QA), constitutes a chemical model of neurodegenerative brain disease. Complementary techniques were combined to examine the consequences of QA injection into medial prefrontal cortex (mPFC) of C57BL6 mice. In accordance with the NMDAR-mediated synapto- and neurotoxic action of QA, we found an initial increase in excitability and an augmentation of hippocampal long-term potentiation, converting within two weeks into a reduction and impairment, respectively, of these processes...
November 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27816759/brain-quantitative-proteomic-responses-reveal-new-insight-of-benzotriazole-neurotoxicity-in-female-chinese-rare-minnow-gobiocypris-rarus
#11
Xuefang Liang, Christopher J Martyniuk, Jinmiao Zha, Zijian Wang
Benzotriazole (BT) is a high-production volume chemical which has been ubiquitously detected in aquatic environments. Although adverse effects from acute and chronic exposure to BT have been reported, the neurotoxic effect of BT and the mechanisms of toxicity are not well documented. In this study, adult female Chinese rare minnow (Gobiocypris rarus) were exposed to 0.05, 0.5, and 5mg/L BT for 28days. The brain proteome showed that BT exposure mainly involved in metabolic process, signal transduction, stress response, cytoskeleton, and transport...
December 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27797173/dipeptidyl-vinyl-sulfone-as-a-novel-chemical-tool-to-inhibit-hmgb1-nlrp3-inflammasome-and-inflamma-mirs-in-a%C3%AE-mediated-microglial-inflammation
#12
Ana Sofia Falcão, Luís A R Carvalho, Gonçalo Lidónio, Ana Rita Vaz, Susana Dias Lucas, Rui Moreira, Dora Brites
Rapid microglial activation and associated inflammatory pathways contribute to immune-defense and tissue repair in the central nervous system (CNS). However, persistent activation of these cells will ultimately result in vast production of pro-inflammatory mediators and other neurotoxic factors, which may induce neuronal damage and contribute to chronic neurodegenerative diseases, as Alzheimer's disease (AD). Therefore, small molecules with immunomodulatory effects on microglia may be considered as potential tools to counteract their pro-inflammatory phenotype and neuroimmune dysregulation in such disorders...
October 31, 2016: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/27794438/locomotor-activity-and-tissue-levels-following-acute-administration-of-lambda-and-gamma-cyhalothrin-in-rats
#13
Virginia C Moser, Zhiwei Liu, Christopher Schlosser, Terri L Spanogle, Appavu Chandrasekaran, Katherine L McDaniel
Pyrethroids produce neurotoxicity that depends, in part, on the chemical structure. Common behavioral effects include locomotor activity changes and specific toxic syndromes (types I and II). In general these neurobehavioral effects correlate well with peak internal dose metrics. Products of cyhalothrin, a type II pyrethroid, include mixtures of isomers (e.g., λ-cyhalothrin) as well as enriched active isomers (e.g., γ-cyhalothrin). We measured acute changes in locomotor activity in adult male rats and directly correlated these changes to peak brain and plasma concentrations of λ- and γ-cyhalothrin using a within-subject design...
December 15, 2016: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/27785946/2-2-2-trifluoroethyl-thiadiazines-a-patent-evaluation-of-wo2016023927
#14
Victor V Dotsenko, Elena A Chigorina, Sergey G Krivokolysko
The Alzheimer's disease (AD) is acknowledged as the most common type of dementia in aging adults. It is characterized by the formation of intracellular neurofibrillary tangles and extracellular amyloid plaques. The latter insoluble deposits mainly consist of β-amyloid peptides (Aβ), which are the derivatives of the amyloid precursor protein (APP). The formation of neurotoxic Aβ-peptides involves the cleavage of APP with beta-secretase enzyme (beta-site APP cleaving enzyme 1, BACE1) so the potential of BACE1 inhibitors as therapeutic agents for AD is now drawing much attention...
December 2016: Expert Opinion on Therapeutic Patents
https://www.readbyqxmd.com/read/27785693/a-high-resolution-accurate-mass-hram-data-dependent-ms-3-neutral-loss-screening-classification-and-relative-quantitation-methodology-for-carbonyl-compounds-in-saliva
#15
Romel Dator, Andrea Carrà, Laura Maertens, Valeria Guidolin, Peter W Villalta, Silvia Balbo
Reactive carbonyl compounds (RCCs) are ubiquitous in the environment and are generated endogenously as a result of various physiological and pathological processes. These compounds can react with biological molecules inducing deleterious processes believed to be at the basis of their toxic effects. Several of these compounds are implicated in neurotoxic processes, aging disorders, and cancer. Therefore, a method characterizing exposures to these chemicals will provide insights into how they may influence overall health and contribute to disease pathogenesis...
October 26, 2016: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/27775155/recent-developments-of-hydrazide-hydrazone-derivatives-and-their-analogs-as-anticonvulsant-agents-in-animal-models
#16
Violina Angelova, Valentin Karabeliov, Pavlina A Andreeva-Gateva, Jana Tchekalarova
Preclinical Research Epilepsy is a chronic devastating neurological disorder characterized by synchronous interictal discharges. Treatment with antiepileptic drugs (AEDs) can alleviate spontaneous seizure activity without preventing the progression and development of epileptogenesis. Current design and development of new AEDs and strategies for the prevention of epilepsy is focused mainly on attenuating uncontrolled seizures, severe side effects and toxicity in chronic drug therapy. It has thus become necessary to discover new chemical pharmacophores with a broad spectrum of activity and less neurotoxicity...
November 2016: Drug Development Research
https://www.readbyqxmd.com/read/27769873/mitochondrial-proteomic-alterations-caused-by-long-term-low-dose-copper-exposure-in-mouse-cortex
#17
Xuemei Lin, Gang Wei, Zhijun Huang, Zhongsen Qu, Xinfeng Huang, Hua Xu, Jianjun Liu, Zhixiong Zhuang, Xifei Yang
Mitochondrial dysfunction is involved in neurotoxicity caused by exposure of various chemicals such as copper. However, the effects of long-term low-dose copper exposure on mitochondrial proteome remain unclear. In this study, we found the treatment of copper (0.13ppm copper sulfate in drinking water) for 12 months caused abnormal expression of a total of 13 mitochondrial proteins (7 up-regulated and 6 down-regulated) as revealed by two-dimensional electrophoresis coupled with mass spectrometry in mouse cortex...
October 18, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27768849/use-of-physiologically-based-kinetic-modeling-based-reverse-dosimetry-to-predict-in-vivo-toxicity-from-in-vitro-data
#18
Jochem Louisse, Karsten Beekmann, Ivonne Magdalena Catharina Maria Rietjens
The development of reliable non-animal based testing strategies, such as in vitro bioassays, is the holy grail in current human safety testing of chemicals. However, the use of in vitro toxicity data in risk assessment is not straightforward. One of the main issues is that concentration-response curves from in vitro models need to be converted to in vivo dose-response curves. These dose-response curves are needed in toxicological risk assessment to obtain a point of departure to determine safe exposure levels for humans...
October 21, 2016: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/27766768/flavonoids-and-their-glycosides-as-anti-amyloidogenic-compounds-a%C3%AE-1-42-interaction-studies-to-gain-new-insights-on-their-potential-for-alzheimer-s-disease-prevention-and-therapy
#19
Cinzia Guzzi, Laura Colombo, Ada De Luigi, Mario Salmona, Francesco Nicotra, Cristina Airoldi
Combining NMR spectroscopy, transmission electron microscopy, biochemical and in vitro toxicity assays, we characterized the effect of flavonoid glycosylation, a chemical modification very frequent in Nature, on their ability to recognise and bind Aβ1-42 oligomers, preventing their aggregation and their neurotoxicity. Our data allow the elucidation of their structure activity relationships, showing that glycosylation has a modest impact on flavonoid affinity for Aβ oligomers but, at the same time, increases both solubility and chemical stability, thus promoting their beneficial properties against Alzheimer's diseases (AD)...
October 21, 2016: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/27753008/neurotoxicology-of-synthetic-cathinone-analogs
#20
Mariana Angoa-Pérez, John H Anneken, Donald M Kuhn
The present review briefly explores the neurotoxic properties of methcathinone, mephedrone, methylone, and methylenedioxypyrovalerone (MDPV), four synthetic cathinones most commonly found in "bath salts." Cathinones are β-keto analogs of the commonly abused amphetamines and display pharmacological effects resembling cocaine and amphetamines, but despite their commonalities in chemical structures, synthetic cathinones possess distinct neuropharmacological profiles and produce unique effects. Among the similarities of synthetic cathinones with their non-keto analogs are their targeting of monoamine systems, the release of neurotransmitters, and their stimulant properties...
October 18, 2016: Current Topics in Behavioral Neurosciences
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