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Zinc toxicity

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https://www.readbyqxmd.com/read/28214952/novel-potential-scaffold-for-periodontal-tissue-engineering
#1
Raquel Osorio, Camilo Andrés Alfonso-Rodríguez, Estrella Osorio, Antonio L Medina-Castillo, Miguel Alaminos, Manuel Toledano-Osorio, Manuel Toledano
OBJECTIVE: The objective of the study is characterization of novel calcium and zinc-loaded electrospun matrices to be used for periodontal regeneration. MATERIALS AND METHODS: A polymethylmetacrylate-based membrane was calcium or zinc loaded. Matrices were characterized morphologically by atomic force and scanning electron microscopy and mechanically probed by a nanoindenter. Biomimetic calcium phosphate precipitation on polymeric tissues was assessed. Cell viability tests were performed using oral mucosa fibroblasts...
February 18, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28214608/near-infrared-activatable-phthalocyanine-poly-l-glutamic-acid-conjugate-increased-cellular-uptake-and-light-dark-toxicity-ratio-towards-an-effective-photodynamic-cancer-therapy
#2
Lik Voon Kiew, Hoay Yan Cheah, Siew Hui Voon, Elena Gallon, Julie Movellan, Kia Hui Ng, Serkan Alpugan, Hong Boon Lee, Fabienne Dumoulin, María J Vicent, Lip Yong Chung
In photodynamic therapy (PDT), the low absorptivity of photosensitizers in an aqueous environment reduces singlet oxygen generation efficiency and thereby decreases photosensitizing efficacy in biological conditions. To circumvent this problem, we designed a phthalocyanine-poly-L-glutamic acid conjugate (1-PG) made from a new phthalocyanine (Pc 1) monofunctionalized to allow adequate conjugation to PGA. The resulting 1-PG conjugate retained high absorptivity in the near-infrared (NIR) region at its λmax 675nm in an aqueous environment...
February 15, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28212817/in-vivo-toxicity-of-copper-oxide-lead-oxide-and-zinc-oxide-nanoparticles-acting-in-different-combinations-and-its-attenuation-with-a-complex-of-innocuous-bio-protectors
#3
Ilzira A Minigalieva, Boris A Katsnelson, Vladimir G Panov, Larisa I Privalova, Anatoly N Varaksin, Vladimir B Gurvich, Marina P Sutunkova, Vladimir Ya Shur, Ekaterina V Shishkina, Irene E Valamina, Ilya V Zubarev, Oleg H Makeyev, Ekaterina Y Meshtcheryakova, Svetlana V Klinova
Stable suspensions of metal oxide nanoparticles (Me-NPs) obtained by laser ablation of 99.99% pure copper, zinc or lead under a layer of deionized water were used separately, in three binary combinations and a triple combination in two independent experiments on rats. In one of the experiments the rats were instilled with Me-NPs intratracheally (i.t.) (for performing a broncho-alveolar lavage in 24hrs to estimate the cytological and biochemical indices of the response of the lower airways), while in the other, Me-NPs were repeatedly injected intraperitoneally (i...
February 14, 2017: Toxicology
https://www.readbyqxmd.com/read/28212474/-zinc-phosphide-poisoning-in-pediatric-patients-from-a-toxicology-center-at-mexico-city
#4
María Carmen Socorro Sánchez-Villegas, Alejandro Bárcena-Ruiz
BACKGROUND: Zinc phosphide is a chemical compound that is frequently used as a rodenticide; it is a highly toxic product that is widely used, among other spaces, at home. Given that it is a highly commercialized pesticide and that there is no antidote, it is mandatory to establish favorably the clinical manifestations of the intoxication. The aim was to describe the epidemiological and clinical profile of children intoxicated with zinc phosphide attended in a toxicological center of a tertiary referral hospital...
2017: Revista Médica del Instituto Mexicano del Seguro Social
https://www.readbyqxmd.com/read/28212344/green-microwave-assisted-combustion-synthesis-of-zinc-oxide-nanoparticles-with-citrullus-colocynthis-l-schrad-characterization-and-biomedical-applications
#5
Susan Azizi, Rosfarizan Mohamad, Mahnaz Mahdavi Shahri
In this paper, a green microwave-assisted combustion approach to synthesize ZnO-NPs using zinc nitrate and Citrullus colocynthis (L.) Schrad (fruit, seed and pulp) extracts as bio-fuels is reported. The structure, optical, and colloidal properties of the synthesized ZnO-NP samples were studied. Results illustrate that the morphology and particle size of the ZnO samples are different and depend on the bio-fuel. The XRD results revealed that hexagonal wurtzite ZnO-NPs with mean particle size of 27-85 nm were produced by different bio-fuels...
February 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28211173/methyl-jasmonate-ameliorates-testosterone-propionate-induced-prostatic-hyperplasia-in-castrated-wistar-rats
#6
Olubukola Oyebimpe Akanni, Olusoji John Abiola, Oluwatosin Adekunle Adaramoye
Benign prostate hyperplasia (BPH) is a progressive disease that is related to age. Known therapeutic agents used in the treatment of BPH are associated with toxicity. Therefore, chemoprevention could be an effective approach. We investigated the ameliorative effects of methyl jasmonate (MeJA) in testosterone propionate (TP)-induced BPH in castrated rats. Castration was performed by removing both testes through the scrotum sack under ketamine anesthesia. Rats were assigned into seven groups of seven animals each: non-castrated control, castrated control, castrated rats that received TP, castrated rats that received TP and MeJA, castrated rats that received TP and finasteride, castrated rats that received MeJA, and castrated rats that received finasteride...
February 16, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28208654/a-protein-isolate-from-moringa-oleifera-leaves-has-hypoglycemic-and-antioxidant-effects-in-alloxan-induced-diabetic-mice
#7
Paulo C Paula, Daniele O B Sousa, Jose T A Oliveira, Ana F U Carvalho, Bella G T Alves, Mirella L Pereira, Davi F Farias, Martonio P Viana, Flavia A Santos, Talita C Morais, Ilka M Vasconcelos
Moringa oleifera has been used in traditional medicine to treat diabetes. However, few studies have been conducted to relate its antidiabetic properties to proteins. In this study, a leaf protein isolate was obtained from M. oleifera leaves, named Mo-LPI, and the hypoglycemic and antioxidant effects on alloxan-induced diabetic mice were assessed. Mo-LPI was obtained by aqueous extraction, ammonium sulphate precipitation and dialysis. The electrophoresis profile and proteolytic hydrolysis confirmed its protein nature...
February 11, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28207001/genome-editing-using-facs-enrichment-of-nuclease-expressing-cells-and-indel-detection-by-amplicon-analysis
#8
Lindsey A Lonowski, Yoshiki Narimatsu, Anjum Riaz, Catherine E Delay, Zhang Yang, Francesco Niola, Katarzyna Duda, Elke A Ober, Henrik Clausen, Hans H Wandall, Steen H Hansen, Eric P Bennett, Morten Frödin
This protocol describes methods for increasing and evaluating the efficiency of genome editing based on the CRISPR-Cas9 (clustered regularly interspaced short palindromic repeats-CRISPR-associated 9) system, transcription activator-like effector nucleases (TALENs) or zinc-finger nucleases (ZFNs). First, Indel Detection by Amplicon Analysis (IDAA) determines the size and frequency of insertions and deletions elicited by nucleases in cells, tissues or embryos through analysis of fluorophore-labeled PCR amplicons covering the nuclease target site by capillary electrophoresis in a sequenator...
March 2017: Nature Protocols
https://www.readbyqxmd.com/read/28205080/assessment-of-cu-zn-edta-parenteral-toxicity-in-calves
#9
Luis Emilio Fazzio, Diana Esther Rosa, Sebastian Julio Picco, Guillermo Alberto Mattioli
Copper (Cu) parenteral administration is used in a beef cow-calf operations to prevent or correct Cu deficiency in bovines. At present, Zinc (Zn) salts have been incorporated to complement Cu antioxidant effect. A risk of hepatotoxicity generated by overdose is a negative consequence of injectable Cu application. Cu-Zn EDTA appears as an alternative; however, data about its toxicity is unknown. The aim of this study was to assess toxicity risk of different doses of Cu-Zn EDTA in calves. Thirty two Aberdeen Angus calves of 162 (±20) kg BW were assigned to 4 groups (n = 8), homogeneous in weight, sex, and age...
February 15, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28196538/functional-studies-of-drosophila-zinc-transporters-reveal-the-mechanism-for-zinc-excretion-in-malpighian-tubules
#10
Sai Yin, Qiuhong Qin, Bing Zhou
BACKGROUND: Zinc is an essential metal involved in many physiological processes. Previous work has identified a set of zinc transporters involved in Drosophila dietary zinc absorption. However, zinc excretion and reabsorption, the other two important processes to maintain zinc homeostasis, are not as well understood. In this work, we screened all the potential zinc transporter Zip (SLC39) and ZnT (SLC30) members for their likely roles in zinc excretion in Malpighian tubules, an insect organ functionally analogous to mammalian kidneys...
February 14, 2017: BMC Biology
https://www.readbyqxmd.com/read/28196455/toxicological-perturbations-of-zinc-oxide-nanoparticles-in-the-coelatura-aegyptiaca-mussel
#11
Sohair R Fahmy, Dawlat A Sayed
More research is needed to understand the interactions of nanoparticles (NPs) with aquatic organisms and their mechanism of toxic action. Zinc oxide nanoparticles (ZnONPs) are the most used engineered metal oxide NPs in consumer products. The present study was designed to evaluate the cytotoxicity, genotoxicity and digestive gland (DG) as well as gill histopathology of the freshwater molluscan bivalve Coelatura aegyptiaca following exposure to ZnONPs (2, 10 and 50 mg/L) for 6 consecutive days. Exposure to ZnONPs (10 and 50 mg/L) induced a significant increase in malondialdehyde, superoxide dismutase and nitric oxide with a concomitant decrease in reduced glutathione, glutathione-S-transferase and catalase levels in the haemolymph, DG and gills of the treated mussels...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28194465/unravelling-the-role-of-protein-kinase-ck2-in-metal-toxicity-using-gene-deletion-mutants
#12
Adam J Johnson, Mohammad S Zaman, Filip Veljanoski, Alex A Phrakaysone, Suhua Li, Patrick J O'Doherty, Gayani Petersingham, Gabriel G Perrone, Mark P Molloy, Ming J Wu
Metal ions, biologically essential or toxic, are present in the surrounding environment of living organisms. Understanding their uptake, homeostasis or detoxification is critical in cell biology and human health. In this study, we investigated the role of protein kinase CK2 in metal toxicity using gene deletion strains of Saccharomyces cerevisiae against a panel of six metal ions. The deletion of CKA2, the yeast orthologue of mammalian CK2α', leads to a pronounced resistant phenotype against Zn(2+) and Al(3+), whilst the deletion of CKB1 or CKB2 results in tolerance to Cr(6+) and As(3+)...
February 14, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28193585/the-filter-feeder-dreissena-polymorpha-affects-nutrient-silicon-and-metal-loid-mobilization-from-freshwater-sediments
#13
Jörg Schaller, Britta Planer-Friedrich
Organic sediments in aquatic ecosystems are well known sinks for nutrients, silicon, and metal(loid)s. Organic matter-consuming organisms like invertebrate shredders, grazers, and bioturbators significantly affect element fixation or remobilization by changing redox conditions or binding properties of organic sediments. Little is known about the effect of filter feeders, like the zebra mussel Dreissena polymorpha, an invasive organism in North American and European freshwater ecosystems. A laboratory batch experiment exposing D...
February 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28183658/antifungal-activity-of-wide-band-gap-thioglycolic-acid-capped-zns-mn-semiconductor-nanoparticles-against-some-pathogenic-fungi
#14
Isam M Ibrahim, Iftikhar M Ali, Batol Imran Dheeb, Qayes A Abas, Asmeit Ramizy, M H Eisa, A I Aljameel
The manganese doped zinc sulfide nanoparticles were synthesized by simple aqueous chemical reaction of manganese chloride, zinc acetate and thioacitamide in aqueous solution. Thioglycolic acid is used as capping agent for controlling the nanoparticle size. The main advantage of the ZnS:Mn nanoparticles of diameter ~2.73nm is that the sample is prepared by using non-toxic precursors in a cost effective and eco-friendly way. The structural, morphological and chemical composition of the nanoparticles have been investigated by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) with energy dispersion spectroscopy (EDS) and Fourier transform infrared (FTIR) spectroscopy...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183164/estrogenic-activity-of-zinc-pyrithione-an-in-vivo-and-in-vitro-study
#15
Seung Jun Kwack, Kyung Sik Yoon, Nam Hee Youn, Hyun Gyung Gu
Objectives: Zinc pyrithione is commonly used to prevent dandruff and seborrheic dermatitis. Many consumers are exposed daily to high doses of zinc pyrithione, causing serious concerns about its toxicity. The reproductive and developmental toxicities were previously reported in pregnant rats. However, the estrogenic activity of zinc pyrithione at varying degrees of exposure has been rarely studied. Thus, we performed an uterotrophic assay, E-screen assay, and gene expression profiling to assess the estrogenic activity of zinc pyrithione...
February 9, 2017: Environmental Health and Toxicology
https://www.readbyqxmd.com/read/28183061/trace-elements-in-oceanic-pelagic-communities-in-the-western-indian-ocean
#16
Nathalie Bodin, Dora Lesperance, Rona Albert, Stephanie Hollanda, Philippe Michaud, Maxime Degroote, Carine Churlaud, Paco Bustamante
The mineral composition of target and non-target pelagic fish caught by purse-seiners and longliners in the western-central Indian Ocean was determined. From the 10 essential elements analysed, selenium and zinc showed the highest concentrations in swordfish and blue marlin while Indian mackerel appeared as a good source of copper, iron and chrome. All catch had levels of lead and cadmium, two toxic elements, below the maximum sanitary limits. Although some concerns were raised regarding mercury concentrations in the largest species (wahoo, swordfish and blue marlin), molar ratios of mercury and selenium indicate that all oceanic pelagic fish from the western-central Indian Ocean are safe for human consumption...
January 21, 2017: Chemosphere
https://www.readbyqxmd.com/read/28182957/heteroagglomeration-of-zinc-oxide-nanoparticles-with-clay-mineral-modulates-the-bioavailability-and-toxicity-of-nanoparticle-in-tetrahymena-pyriformis
#17
Govind Sharan Gupta, Violet Aileen Senapati, Alok Dhawan, Rishi Shanker
The extensive use of zinc oxide nanoparticles (ZnO NPs) in cosmetics, sunscreens and healthcare products increases their release in the aquatic environment. The present study explored the possible interaction of ZnO NPs with montmorillonite clay minerals in aqueous conditions. An addition of ZnO NPs on clay suspension significantly (p<0.05) increases the hydrodymic size of clay particles from 1652±90nm to 2158±13nm due to heteroagglomeration. The electrokinetic measurements showed a significant (p<0...
January 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28182578/review-of-heavy-metal-accumulation-on-aquatic-environment-in-northern-east-mediterrenean-sea-part-i-some-essential-metals
#18
Ayşe Bahar Yılmaz, Alper Yanar, Ela Nur Alkan
All pollutants can reach the aquatic environments and the levels of heavy metals in upper members of the food web like fish can reach values many times higher than those found in aquatic environment or in sediments. Although heavy metals are essential or non-essential, all heavy metals are potentially harmful to humans and most organisms at some level of exposure and absorption. Marine organisms are good indicators for long-term monitoring of metal accumulation. The present review study is for evaluation of the data from previous studies about the toxic effects of selected heavy metals, like essential metals (copper, zinc, iron, chromium, and manganese), on seawater, sediment, and in different tissues of aquatic animals (demersal and bentic fish, invertabres) collected from different areas in Northern East Mediterrenean Sea since the 1990s...
February 9, 2017: Reviews on Environmental Health
https://www.readbyqxmd.com/read/28166935/toxicoses-of-the-ruminant-nervous-system
#19
REVIEW
Gene A Niles
This article discusses the etiology, mechanism of action, clinical signs, and diagnostic tests used to identify toxic agents that affect the nervous system of ruminants. The article is not intended to be an exhaustive review of each agent, but a reference for establishing a differential diagnosis when toxic agents are suspected as the cause of central nervous system disease in ruminants. The initial focus of the article is on agents that cause brain lesions consistent with polioencephalomalacia. Other neurotoxic disease agents include bovine bonkers, urea, organophosphate, organochlorine, cyanobacteria, zinc, aluminum, phosphide, metaldehyde, strychnine, botulism, tetanus, clostridium perfringens, and poisonous plants...
March 2017: Veterinary Clinics of North America. Food Animal Practice
https://www.readbyqxmd.com/read/28163230/core-interlayer-shell-fe3o4-msio2-lipid-peg-methotrexate-nanoparticle-for-multimodal-imaging-and-multistage-targeted-chemo-photodynamic-therapy
#20
Guihua Liu, Jinyuan Ma, Yang Li, Qi Li, Chunhua Tan, Hua Song, Shuhui Cai, Dengyue Chen, Zhenqing Hou, Qing Chen, Xuan Zhu
Multimodal imaging-guided multistage targeted synergistic combination therapy possesses many advantages including increased tumoricidal effect, reduced toxicity, and retarded drug resistance. Herein, we have elaborately developed a core-interlayer-shell structure Fe3O4@mSiO2@lipid-PEG-methotrexatenanoparticle(FMLM), in which the Fe3O4 core could be used for magnet-stimulate-response drug release, magnetic resonance imaging, and early-phase magnet targeting ability; the mSiO2 layer could encapsulate anticancer drug doxorubicin (Dox) for chemotherapy; and the protective shell of lipid-PEG and lipid-PEG-methotrexate offered later-phase specific cellular targeting ability, good water dispersibility, and loading of photosensitizer zinc phthalocyanine (ZnPc) for simultaneous near-infrared fluorescence imaging and photodynamic therapy...
February 2, 2017: International Journal of Pharmaceutics
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