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Fluoride toxicity

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https://www.readbyqxmd.com/read/29764242/morbidity-and-mortality-resulting-from-acute-inhalation-exposures-to-hydrogen-fluoride-and-carbonyl-fluoride-in-rats
#1
Adolph J Januszkiewicz, Matthew A Bazar, Lee C B Crouse, Michael A Chapman, Steven E Hodges, Steven J McCormick, Arthur J O'Neill
OBJECTIVE: Experiments were undertaken to compare morbidity and mortality from brief inhalation exposures to high levels of hydrogen fluoride (HF) and carbonyl fluoride (COF2 ). METHODS: Rats from both sexes were exposed for durations of 5 and 10 min to nominal concentrations of 10,000 to 57,000 ppm HF or 500 to 10,000 ppm COF2 . Respiration was monitored before, during, and after exposure. Animals were observed up to 6 days post-exposure. Terminal blood samples were collected for routine clinical chemistry and hematology...
May 15, 2018: Inhalation Toxicology
https://www.readbyqxmd.com/read/29763350/fluoride-exposure-in-early-life-as-the-possible-root-cause-of-disease-in-later-life
#2
Tetsuo Nakamoto, H Ralph Rawls
Fluoride, one of the most celebrated ingredients for the prevention of dental caries in the 20th century, has also been controversial for its use in dentifrices and other applications. In the current review, we have concentrated primarily on early-life exposure to fluoride and how it may affect the various organs. The most recent controversial aspects of fluoride are related to toxicity of the developing brain and how it may possibly result in the decrease of intelligence quotient (IQ), autism, and calcification of the pineal gland...
May 15, 2018: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/29758312/protocatechuic-acid-methyl-ester-modulates-fluoride-induced-pulmonary-toxicity-in-rats
#3
Jaishabanu Ameeramja, Vishnu Vignesh Kanagaraj, Ekambaram Perumal
We have found that protocatechuic acid methyl ester (PCAME) attenuates fluoride (F- ) toxicity in lung epithelial cells (A549). However, these finding has to be confirmed with in vivo studies. Further, the effect of PCAME on F- induced pulmonary fibrosis and inflammation remains limited. Hence, the present study is aimed to determine the protective effect PCAME against F- induced pulmonary toxicity in female albino Wistar rats. The animals were treated with sodium fluoride (NaF, 300 ppm in drinking water ad libitum) alone or in combination with PCAME (25 or 50 mg/kg bw/day by oral intubation) for 60 days and analyzed for changes in lung histology, oxidative stress, inflammation, apoptosis and fibrosis markers...
May 11, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29715188/possible-protective-effect-of-curcumin-on-the-thyroid-gland-changes-induced-by-sodium-fluoride-in-albino-rats-light-and-electron-microscopic-study
#4
Mohamed Mostafa Abdelaleem, Nashwa Fathy Gamal El-Tahawy, Samah Mohammed Mahmoud Abozaid, Shima Abdel-Baset Abdel-Hakim
OBJECTIVES: Thyroid gland regulates the body's metabolic rate and plays an exquisitely important role in the human health. Fluoride exposure can affect thyroid function. Curcumin is a potent antioxidant that works through several mechanisms. The aim of the present study was to demonstrate the hormonal, histological, and ultrastructural changes occurred in the thyroid gland induced by exposure to sodium fluoride (NaF) and study the possible protective effect of curcumin on the NaF-induced effects...
April 1, 2018: Endocrine Regulations
https://www.readbyqxmd.com/read/29707852/dentinal-tubule-occluding-capability-of-nano-hydroxyapatite-the-in-vitro-evaluation
#5
Serdar Baglar, Umit Erdem, Mustafa Dogan, Mustafa Turkoz
In this in-vitro study, the effectiveness of experimental pure nano-hydroxyapatite (nHAP) and 1%, 2%, and 3% F¯ doped nano-HAp on dentine tubule occlusion was investigated. And also, the cytotoxicity of materials used in the experiment was evaluated. Nano-HAp types were synthesized by the precipitation method. Forty dentin specimens were randomly divided into five groups of; 1-no treatment (control), 2-specimens treated with 10% pure nano-HAp and 3, 4, 5 specimens treated with 1%, 2%, and 3% F- doped 10% nano-HAp, respectively...
April 29, 2018: Microscopy Research and Technique
https://www.readbyqxmd.com/read/29705835/liver-proteome-of-mice-with-distinct-genetic-susceptibilities-to-fluorosis-treated-with-different-concentrations-of-f-in-the-drinking-water
#6
Zohaib Nisar Khan, Isabela Tomazini Sabino, Carina Guimarães de Souza Melo, Tatiana Martini, Heloísa Aparecida Barbosa da Silva Pereira, Marília Afonso Rabelo Buzalaf
Appropriate doses of fluoride (F) have therapeutic action against dental caries, but higher levels can cause disturbances in soft and mineralized tissues. Interestingly, the susceptibility to the toxic effects of F is genetically determined. This study evaluated the effects of F on the liver proteome of mice susceptible (A/J) or resistant (129P3/J) to the effects of F. Weanling male A/J (n = 12) and 129P3/J (n = 12) mice were housed in pairs and assigned to two groups given low-F food and drinking water containing 15 or 50 ppm F for 6 weeks...
April 29, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29680885/spatial-distribution-of-uranium-and-basic-water-quality-parameter-in-the-capital-of-bihar-and-consequent-ingestion-dose
#7
Deepak Kumar, Anshuman Singh, Rishi Kumar Jha
Investigation of presence of Uranium (U) in groundwater/drinking water is an active are of research due to its chemical and radiological toxicity as well as long-term health effects. The current study had the objective of estimating U as a naturally occurring radioactive element in groundwater samples and assessment of ingestion dose, when groundwater is the source of drinking water. The random sampling method was chosen for the collection of samples based on population density. The estimation of U was done using LED fluorimeter...
April 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29668652/role-of-polyphenols-and-nonpolyphenols-against-toxicity-induced-by-fluoride-a-comprehensive-review
#8
Samuel R Claudio, Bianca A Handan, Carolina F Gomes de Moura, Milena de Barros Viana, Liria Y Yamauchi, Odair Aguiar, Celina T F Oshima, Daniel A Ribeiro
Since its discovery as an antimicrobial agent, fluoride has been used in the control of dental caries. Many studies have shown that the chronic exposure of fluoride in high concentrations causes adverse effects in multiple organs; the use of bioactive compounds present in foods as a tool to mitigate the effects of fluoride could potentially be useful for populations in different parts of the world are exposed to fluoride in a chronic and systemic way. Thus, the aim of this comprehensive review is to present and discuss the published papers that focused on the use of polyphenols and nonpolyphenols that can mitigate the harmful activities promoted by fluoride exposure...
April 17, 2018: European Journal of Cancer Prevention
https://www.readbyqxmd.com/read/29660723/fluoride-prevalence-in-groundwater-around-a-fluorite-mining-area-in-the-flood-plain-of-the-river-swat-pakistan
#9
Abdur Rashid, Dong-Xing Guan, Abida Farooqi, Sardar Khan, Salman Zahir, Shah Jehan, Seema Anjum Khattak, Muhammad Sufaid Khan, Raees Khan
This study investigated the fluoride (F- ) concentrations and physicochemical parameters of the groundwater in a fluorite mining area of the flood plain region of the River Swat, with particular emphasis on the fate and distribution of F- and the hydrogeochemistry. To better understand the groundwater hydrochemical profile and F- enrichment, groundwater samples (n=53) were collected from shallow (24-40m), mid-depth (48-65m) and deep (85-120m) aquifers, and then analysed using an ion-selective electrode. The lowest F- concentration (0...
April 13, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29653260/comparative-proteomic-analysis-of-fluoride-treated-rat-bone-provides-new-insights-into-the-molecular-mechanisms-of-fluoride-toxicity
#10
Yan Wei, Beibei Zeng, Hua Zhang, Cheng Chen, Yanli Wu, Nanlan Wang, Yanqiu Wu, Danqing Zhao, Yuxi Zhao, Javed Iqbal, Liming Shen
Long-term excessive intake of fluoride (F) could lead to chronic fluorosis. To explore the underlying molecular mechanisms, present study is designed to elucidate the effect of fluoride on proteome expression of bone in sodium fluoride (NaF)-treated SD rats. Hematoxylin and eosin (H&E) staining was used to determine the severity of osteofluorosis, and bone samples were submitted for iTRAQ analysis. The results showed that the cortical thickness and trabecular area of femur bone in medium- and high-dose groups were higher than in control group...
April 10, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29649763/fluoride-distribution-and-contamination-in-the-water-soil-and-plants-continuum-and-its-remedial-technologies-an-indian-perspective-a-review
#11
REVIEW
Gayatri Singh, Babita Kumari, Geetgovind Sinam, Kriti, Navin Kumar, Shekhar Mallick
Fluorine is an essential element required in trace amounts but gets toxic for human beings at levels more than 1.5 mg F- L-1 primarily through drinking contaminated water. It is the 13th most abundant element and constitutes about 0.06-0.09% in the earth crust. It is electronegative in aqueous medium forming fluoride ion (F- ). Fluoride contamination in the environment occurs mostly due to anthropogenic and geogenic sources. Fluoride is widely distributed in all components of environment, air (0.1-0.6 μg L-1 ) soils (150-400 mg Kg-1 ) rocks (100-2000 mg Kg-1 ), plant (0...
April 9, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29613814/grape-seed-procyanidins-extract-attenuates-cisplatin-induced-oxidative-stress-and-testosterone-synthase-inhibition-in-rat-testes
#12
Minmin Tian, Fangfang Liu, Han Liu, Qiong Zhang, Lei Li, Xiangbo Hou, Jianxin Zhao, Sheng Li, Xuhong Chang, Yingbiao Sun
Cisplatin (CIS) is widely applied for its antihematological malignancies properties and as antisolid tumors drugs. However, it could cause testicular damage related with oxidative stress and testosterone synthesis disorder. Studies reported that grape seed procyanidins extract (GSPE) could improve CIS induced-testes lesion via scavenging free radicals in animals, although its mechanisms were unclear. Therefore, the purpose of the present study was to explore the antagonistic mechanisms of GSPE on CIS-induced testes lesion...
April 3, 2018: Systems Biology in Reproductive Medicine
https://www.readbyqxmd.com/read/29603052/biodegradation-of-pentafluorosulfanyl-substituted-aminophenol-in-pseudomonas-spp
#13
Marta Saccomanno, Sabir Hussain, Neil K O'Connor, Petr Beier, Mate Somlyay, Robert Konrat, Cormac D Murphy
The pentafluorosulfanyl (SF5 -) substituent conveys properties that are beneficial to drugs and agrochemicals. As synthetic methodologies improve the number of compounds containing this group will expand and these chemicals may be viewed as emerging pollutants. As many microorganisms can degrade aromatic xenobiotics, we investigated the catabolism of SF5 -substituted aminophenols by bacteria and found that some Pseudomonas spp. can utilise these compounds as sole carbon and energy sources. GC-MS analysis of the culture supernatants from cultures grown in 5-(pentafluorosulfanyl) 2-aminophenol demonstrated the presence of the N-acetylated derivative of the starting substrate and 4-(pentafluorosulfanyl)catechol...
March 30, 2018: Biodegradation
https://www.readbyqxmd.com/read/29594887/purifying-arsenic-and-fluoride-contaminated-water-by-a-novel-graphene-based-nanocomposite-membrane-of-enhanced-selectivity-and-sustained-flux
#14
Madhubonti Pal, Mrinal Kanti Mondal, Tapan Kanti Paine, Parimal Pal
A novel graphene-based nanocomposite membrane was synthesized by interfacial polymerization (IP) through chemical bonding of the graphene oxide (GO) layer to polyethersulfone surface. Detailed characterization of the composite membrane through AFM, SEM, ATR-FTIR, XRD analysis, and Raman spectroscopy indicates strong potential of the membrane in highly selective removal of the toxic contaminants like arsenic and fluoride while permeating the essential minerals like calcium and magnesium. This makes the membrane suitable for production of safe drinking water from contaminated water...
March 29, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29579689/improved-production-of-isobutanol-in-pervaporation-coupled-bioreactor-using-sugarcane-bagasse-hydrolysate-in-engineered-enterobacter-aerogenes
#15
Hwi-Min Jung, Ju Yeon Lee, Jung-Hyun Lee, Min-Kyu Oh
A process of isobutanol production from sugarcane bagasse hydrolysates in Enterobacter aerogenes was developed here with a pervaporation-integrated procedure. Isobutanol pathway was overexpressed in a mutant strain with eliminated byproduct-forming enzymes (LdhA, BudA, and PflB). A glucose-and-xylose-coconsuming ptsG mutant was constructed for effective utilization of lignocellulosic biomass. Toxic effects of isobutanol were alleviated by in situ recovery via a pervaporation procedure. Compared to single-batch fermentation, cell growth and isobutanol titer were improved by 60% and 100%, respectively, in the pervaporation-integrated fermentation process...
March 19, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29573331/facile-ionic-liquid-assisted-strategy-for-direct-precipitation-of-eu-2-activated-nanophosphors-under-ambient-conditions
#16
Huayna Terraschke, Jacob Olchowka, Eugenie Geringer, Aline Varella Rodrigues, Claudia Wickleder
This work describes a novel ionic liquid (IL)-assisted synthesis strategy for a direct and easy production of Eu2+ -doped nanoparticles (NPs), where ILs are also used as fluoride sources to avoid the use of elemental fluorine or toxic hydrofluoric acid. Up to now, the direct synthesis of Eu2+ -doped nanophosphors consisted of an enormous challenge, due to the oxidation to Eu3+ observed in hydrous solution, which is commonly used for the preparation of NPs, generating lattice defects and undesired particle growth or agglomeration by additional reducing steps at high temperatures...
March 24, 2018: Small
https://www.readbyqxmd.com/read/29572620/groundwater-fluoride-contamination-probable-release-and-containment-mechanisms-a-review-on-indian-context
#17
REVIEW
Indrani Mukherjee, Umesh Kumar Singh
Fluoride contamination in the groundwater has got great attention in last few decades due to their toxicity, persistent capacity and accumulation in human bodies. There are several sources of fluoride in the environment and different pathways to enter in the drinking water resources, which is responsible for potential effect on human health. Presence of high concentration of fluoride ion in groundwater is a major issue and it makes the water unsuitable for drinking purpose. Availability of fluoride in groundwater indicates various geochemical processes and subsurface contamination of a particular area...
March 23, 2018: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/29567983/author-correction-toxic-fluoride-gas-emissions-from-lithium-ion-battery-fires
#18
Fredrik Larsson, Petra Andersson, Per Blomqvist, Bengt-Erik Mellander
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.
March 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29562701/bismuth-oxysulfide-and-its-polymer-nanocomposites-for-efficient-purification
#19
Yidong Luo, Lina Qiao, Huanchun Wang, Shun Lan, Yang Shen, Yuanhua Lin, Cewen Nan
The danger of toxic organic pollutants in both aquatic and air environments calls for high-efficiency purification material. Herein, layered bismuth copper oxychalcogenides, BiCuSO, nanosheets of high photocatalytic activity were introduced to the PVDF (Polyvinylidene Fluoride). The fibrous membranes provide an easy, efficient, and recyclable way to purify organic pollutant. The physical and photophysical properties of the BiCuSO and its polymer composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), ultraviolet-visible diffuse reflection spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), electron spin resonance (EPR)...
March 19, 2018: Materials
https://www.readbyqxmd.com/read/29550512/c-elegans-as-a-model-in-developmental-neurotoxicology
#20
Joanna A Ruszkiewicz, Adi Pinkas, Mahfuzur R Miah, Rebecca L Weitz, Michael J A Lawes, Ayodele J Akinyemi, Omamuyovwi M Ijomone, Michael Aschner
Due to many advantages Caenorhabditis elegans (C. elegans) has become a preferred model of choice in many fields, including neurodevelopmental toxicity studies. This review discusses the benefits of using C. elegans as an alternative to mammalian systems and gives examples of the uses of the nematode in evaluating the effects of major known neurodevelopmental toxins, including manganese, mercury, lead, fluoride, arsenic and organophosphorus pesticides. Reviewed data indicates numerous similarities with mammals in response to these toxins...
March 14, 2018: Toxicology and Applied Pharmacology
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