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Zinc toxicity

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https://www.readbyqxmd.com/read/29162907/physicochemical-characteristics-and-toxicity-of-surface-modified-zinc-oxide-nanoparticles-to-freshwater-and-marine-microalgae
#1
Mana M N Yung, Paul-Antoine Fougères, Yu Hang Leung, Fangzhou Liu, Aleksandra B Djurišić, John P Giesy, Kenneth M Y Leung
Because of wide applications of surface-modified zinc oxide nanoparticles (ZnO-NPs) in commercial sunscreens and their easiness of being released into water, concerns have been raised over their potential effects on aquatic organisms. This study compared physicochemical properties of silane-coated and uncoated ZnO-NPs to elucidate their toxic potencies toward three freshwater and three marine microalgae. Surfaces of ZnO-NPs (20 nm) were modified by coating with 3-aminopropyltrimethoxysilane (A-ZnO-NPs) that provides the particles with a more hydrophilic surface, or dodecyltrichlorosilane (D-ZnO-NPs) that turns the particles to hydrophobic...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29157887/spatial-patterns-of-heavy-metal-accumulation-in-sediments-and-macrophytes-of-bellandur-wetland-bangalore
#2
T V Ramachandra, P B Sudarshan, M K Mahesh, S Vinay
Heavy metals are one among the toxic chemicals and accumulation in sediments and plants has been posing serious health impacts. Wetlands aid as kidneys of the landscape and help in remediation through uptake of nutrients, heavy metals and other contaminants. The analyses of macrophytes and sediment samples help in evaluating pollution status in aquatic environment. In this study concentration of six heavy metals (Cadmium (Cd), Chromium (Cr), Copper (Cu), Nickel (Ni), Lead (Pb) and Zinc (Zn)) were assessed in sediment and dominant macrophyte samples collected from Bellandur Lake, largest Lake of Bangalore, India...
November 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29155567/ratiometric-fluorescent-detection-of-pb-2-by-fret-based-phthalocyanine-porphyrin-dyads
#3
Dongli Zhang, Mengliang Zhu, Luyang Zhao, Jinghui Zhang, Kang Wang, Dongdong Qi, Yang Zhou, Yongzhong Bian, Jianzhuang Jiang
Sensitive and selective detection of Pb(2+) is a very worthwhile endeavor in terms of both human health and environmental protection, as the heavy metal is fairly ubiquitous and highly toxic. In this study, we designed phthalocyanine-porphyrin (Pc-Por) heterodyads, namely, H2Pc-α-ZnPor (1) and H2Pc-β-ZnPor (2), by connecting a zinc(II) porphyrin moiety to the nonperipheral (α) or peripheral (β) position of a metal-free phthalocyanine moiety. Upon excitation at the porphyrin Soret region (420 nm), both of the dyads exhibited not only a porphyrin emission (605 nm) but also a phthalocyanine emission (ca...
November 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29155240/matrix-metalloproteinases-a-challenging-paradigm-of-cancer-management
#4
REVIEW
Ali Alaseem, Khalid Alhazzani, Priya Dondapati, Saad Alobid, Anupam Bishayee, Appu Rathinavelu
Matrix metalloproteinases (MMPs) are members of zinc-dependent endopeptidases implicated in a variety of physiological and pathological processes. Over the decades, MMPs have been studied for their role in cancer progression, migration, and metastasis. As a result, accumulated evidence of MMPs incriminating role has made them an attractive therapeutic target. Early generations of broad-spectrum MMP inhibitors exhibited potent inhibitory activities, which subsequently led to clinical trials. Unexpectedly, these trials failed to meet the desired goals, mainly due to the lack of efficacy, poor oral bioavailability, and toxicity...
November 16, 2017: Seminars in Cancer Biology
https://www.readbyqxmd.com/read/29152044/structure-based-discovery-of-thiosemicarbazone-metalloproteinase-inhibitors-for-hemorrhage-treatment-in-snakebites
#5
Francis B Ferreira, Thiago M Pereira, Dayane L N Souza, Daiana S Lopes, Vitor Freitas, Veridiana M R Ávila, Arthur E Kümmerle, Carlos Mauricio R Sant'Anna
The venoms of snakes are composed by many toxins, which are responsible for various toxic effects including intense pain, bleeding disorders, and local tissue damage caused by hemorrhage and necrosis. The snake venom metalloproteinases (SVMPs) are proteolytic zinc-dependent enzymes acting in different hemostatic mechanisms. In this work, a structure-based molecular modeling strategy was used for the rational design, by means of a homology 3D model of an SVMP isolated from Bothrops pauloensis venom (BpMP-I), followed by synthesis and in vitro evaluation of new thiosemicarbazones as the first inhibitors of the B...
November 9, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29150876/toxicological-characterization-of-zno-nanoparticles-in-malignant-and-non-malignant-cells
#6
Helena Moratin, Agmal Scherzad, Thomas Gehrke, Pascal Ickrath, Katrin Radeloff, Norbert Kleinsasser, Stephan Hackenberg
The increasing usage of zinc oxide nanoparticles (ZnO-NPs) in industrial applications as well as in consumer products raises concern regarding their potential adverse effects to a greater extend. Numerous studies have demonstrated toxic properties of NPs, however there is still a lack of knowledge concerning the underlying mechanisms. This study was designed to systematically investigate cytotoxicity, apoptosis, cell cycle alterations, and genotoxicity induced by ZnO-NP. Moreover, it was an aim of the investigations to specify the diverse effects of nanoparticle exposure in malignant in comparison with non-malignant cells...
November 18, 2017: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/29149555/mapping-the-reactions-in-a-single-zero-valent-iron-nanoparticle
#7
Lan Ling, Xiao-Yue Huang, Meirong Li, Wei-Xian Zhang
Nanoscale zero-valent iron (nZVI) posseses unique functionalities for metal-metalloid removal and sequestration. So far, direct evidence on the heavy metal-iron reactions in the solid phase is still limited due to low concentration of heavy metals and small size of nanoparticles. In this work, angstrom-resolution spectral mappings on the reactions of nZVI with chromate, arsenate, nickel, silver, cesium, and zinc ions are presented. This work was achieved with spherical aberration-corrected scanning transmission electron microscopy integrated with high-sensitivity X-ray energy-dispersive spectroscopy scanning transmission electron microscopy (XEDS-STEM)...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29149053/laser-induced-breakdown-spectroscopy-for-rapid-discrimination-of-heavy-metal-contaminated-seafood-tegillarca-granosa
#8
Guoli Ji, Pengchao Ye, Yijian Shi, Leiming Yuan, Xiaojing Chen, Mingshun Yuan, Dehua Zhu, Xi Chen, Xinyu Hu, Jing Jiang
Tegillarca granosa samples contaminated artificially by three kinds of toxic heavy metals including zinc (Zn), cadmium (Cd), and lead (Pb) were attempted to be distinguished using laser-induced breakdown spectroscopy (LIBS) technology and pattern recognition methods in this study. The measured spectra were firstly processed by a wavelet transform algorithm (WTA), then the generated characteristic information was subsequently expressed by an information gain algorithm (IGA). As a result, 30 variables obtained were used as input variables for three classifiers: partial least square discriminant analysis (PLS-DA), support vector machine (SVM), and random forest (RF), among which the RF model exhibited the best performance, with 93...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29146988/variations-in-nutrient-and-trace-element-composition-of-rice-in-an-organic-rice-frog-coculture-system
#9
Zhimin Sha, Qingnan Chu, Zheng Zhao, Yubo Yue, Linfang Lu, Jing Yuan, Linkui Cao
Introducing frogs into paddy fields can control pests and diseases, and organic farming can improve soil fertility and rice growth. The aim of this 2-year field study was compare the yield and elemental composition of rice between an organic farming system including frogs (ORF) and a conventional rice culture system (CR). The grain yields were almost the same in the ORF system and the CR system. The ORF significantly increased the contents of phosphorus (P), ion (Fe), zinc (Zn), molybdenum (Mo) and selenium (Se) in rice grain at one or both years...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29145169/a-zinc-schiff-base-complex-inhibits-cancer-progression-both-in-vivo-and-in-vitro-by-inducing-apoptosis
#10
Arpita Banerjee, Kaushik Banerjee, Abhinaba Sinha, Satyajit Das, Saikat Majumder, Subrata Majumdar, Soumitra Kumar Choudhuri
Cancer chemotherapy suffers from selectivity and undesired toxicity of the drugs. Since zinc is a biocompatible tracer element and cysteine derivatives are used in cancer chemoprevention, we intend to develop a complex of zinc and cysteine-derivatives as potent, non-toxic anticancer agents. Herein, we synthesized and characterized cysteine based ligand, 2-[(2-Hydroxy-3-methoxy-benzylidene)-amino]-3-mercapto-propionic acid and its Zn-complex, which are found to be non-toxic towards normal human PBMC. Data also revealed that only Zn-complex exhibited remarkable apoptosis in drug-sensitive CCRF-CEM and multidrug-resistant CEM/ADR5000 cancer cells as assessed by MTT, Cell cycle and AnnexinV binding assay...
November 6, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/29143263/enhanced-stabilization-of-pb-zn-and-cd-in-contaminated-soils-using-oxalic-acid-activated-phosphate-rocks
#11
Zhuo Zhang, Guanlin Guo, Mei Wang, Jia Zhang, Zhixin Wang, Fasheng Li, Honghan Chen
Phosphate amendments, especially phosphate rock (PR), are one of the most commonly used materials to stabilize heavy metals in contaminated soils. However, most of PR reserve consists of low-grade ore, which limits the efficiency of PR for stabilizing heavy metals. This study was to enhance the stabilization of heavy metals through improving the available phosphorous (P) release of PR by oxalic acid activation. Raw PR and activated PR (APR) were characterized by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), X-ray powder diffraction (XRD), Brunauer-Emmett-Teller (BET) surface analysis, and laser diffraction to determine the changes of structure and composition of APR...
November 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29141909/local-fitness-landscapes-predict-yeast-evolutionary-dynamics-in-directionally-changing-environments
#12
Florien A Gorter, Mark G M Aarts, Bas J Zwaan, J Arjan G M de Visser
The fitness landscape is a concept that is widely used for understanding and predicting evolutionary adaptation. The topography of the fitness landscape depends critically on the environment, with potentially far-reaching consequences for evolution under changing conditions. However, few studies have assessed directly how empirical fitness landscapes change across conditions, or validated the predicted consequences of such change. We previously evolved replicate yeast populations in the presence of either gradually increasing or constant high concentrations of the heavy metals cadmium (Cd), nickel (Ni), and zinc (Zn), and analysed their phenotypic and genomic changes...
November 15, 2017: Genetics
https://www.readbyqxmd.com/read/29138564/zinc-oxide-nanoparticles-induce-toxic-responses-in-human-neuroblastoma-shsy5y-cells-in-a-size-dependent-manner
#13
Jia Liu, Yiyuan Kang, Suhan Yin, Bin Song, Limin Wei, Liangjiao Chen, Longquan Shao
Due to the widespread applications of zinc oxide nanoparticles (ZnO NPs), the potential exposure of workers, consumers, and scientists to these particles has increased. This potential for exposure has attracted extensive attention in the science community. Many studies have examined the toxicological profile of ZnO NPs in the immune system, digestive system, however, information regarding the toxicity of ZnO NPs in the nervous system is scarce. In this study, we detected the cytotoxicity of two types of ZnO NPs of various sizes - ZnO(a) NPs and ZnO(b) NPs - and we characterized the shedding ability of zinc ions within culture medium and the cytoplasm...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29136341/photodynamic-therapy-and-nuclear-imaging-activities-of-zinc-phthalocyanine-integrated-tio2-nanoparticles-in-breast-and-cervical-tumors
#14
Fatma Yurt, Kasim Ocakoglu, Mine Ince, Suleyman Gokhan Colak, Ozge Er, Hale Melis Soylu, Cumhur Gunduz, Cıgır Biray Avci, Cansu Caliskan Kurt
In recent years, phthalocyanines (Pcs) have been widely used as photosensitizer in photodynamic therapy applications. Because of their strong absorptions in the near-infrared region (640-700 nm). The integration of phthalocyanine derivatives to a nanoparticle is expected to be efficient way to improve the activity of the photosensitizer on the targeted tissue. It is known that the integrated molecules not only show better accumulation on tumor tissue but also reduce toxicity in healthy tissues. In this study, the ZnPc molecule was synthesized and integrated to the TiO2 nanoparticle, to investigate the potential of PDT and its cytotoxicity...
November 14, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/29134976/uptake-of-zinc-by-pteridium-aquilinum-bracken-fern-and-response-of-clarias-gariepinus-juveniles-during-chronic-and-sub-lethal-exposure
#15
F E Olaifa, A A Fabusoro
Zinc is an essential trace element but can be toxic to fish at elevated concentrations. This study was carried out to assess the uptake of zinc by Clarias gariepinus juveniles and Pteridium aquilinum during chronic exposure to sub lethal concentrations. Two experiments were undertaken simultaneously in static renewal bioassays for 28 days.Haematology, histology, zinc accumulation in tissues of C.gariepinus and P. aquilinum were recorded fortnightly. Packed Cell Volume, haemoglobin concentration, Red Blood Cells, White blood cells, Lymphocytes, Neutrophils, Mean Corpuscular Volume, Mean Corpuscular Haemoglobin Concentration and Mean Corpuscular Haemoglobin of C...
June 30, 2017: Nigerian Journal of Physiological Sciences: Official Publication of the Physiological Society of Nigeria
https://www.readbyqxmd.com/read/29127817/heavy-metals-detection-using-biosensor-cells-of-a-novel-marine-luminescent-bacterium-vibrio-sp-mm1-isolated-from-the-caspian-sea
#16
Mojtaba Mohseni, Jaber Abbaszadeh, Shima-Sadat Maghool, Mohammad-Javad Chaichi
Monitoring and assessing toxic materials which are being released into the environment along with wastewater is a growing concern in many industries. The current research describes a highly sensitive and rapid method for the detection of toxic concentrations of heavy metals in aquatic environments. Water samples were collected from southern coasts of the Caspian Sea followed by screening of luminescent bacteria. Phylogenetic analysis, including gene sequence of 16S rRNA, and biochemical tests were performed for identification of the isolate...
November 8, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29123537/association-mapping-of-ferrous-zinc-and-aluminum-tolerance-at-the-seedling-stage-in-indica-rice-using-magic-populations
#17
Lijun Meng, Baoxiang Wang, Xiangqian Zhao, Kimberly Ponce, Qian Qian, Guoyou Ye
Excessive amounts of metal are toxic and severely affect plant growth and development. Understanding the genetic control of metal tolerance is crucial to improve rice resistance to Fe, Zn, and Al toxicity. The multi-parent advanced generation inter-cross (MAGIC) populations were genotyped using a 55 K rice SNP array and screened at the seedling stage for Fe, Zn, and Al toxicity using a hydroponics system. Association analysis was conducted by implementing a mixed linear model (MLM) for each of the five MAGIC populations double cross DC1 (founders were SAGC-08, HHZ5-SAL9-Y3-Y1, BP1976B-2-3-7-TB-1-1, PR33282-B-8-1-1-1-1-1), double cross DC2 (founders of double cross were FFZ1, CT 16658-5-2-2SR-2-3-6MP, IR 68, IR 02A127), eight parents population 8way (founders were SAGC-08, HHZ5-SAL9-Y3-Y1, BP1976B-2-3-7-TB-1-1, PR33282-B-8-1-1-1-1-1, FFZ1, CT 16658-5-2-2SR-2-3-6MP, IR 68, IR 02A127), DC12 (DC1+DC2) and rice multi-parent recombinant inbred line population RMPRIL (DC1+DC2+8way)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29122608/thioredoxin-albumin-fusion-protein-prevents-copper-enhanced-zinc-induced-neurotoxicity-via-its-antioxidative-activity
#18
Ken-Ichiro Tanaka, Mikako Shimoda, Victor T G Chuang, Kento Nishida, Masahiro Kawahara, Tatsuhiro Ishida, Masaki Otagiri, Toru Maruyama, Yu Ishima
Zinc (Zn) is a co-factor for a vast number of enzymes, and functions as a regulator for immune mechanism and protein synthesis. However, excessive Zn release induced in pathological situations such as stroke or transient global ischemia is toxic. Previously, we demonstrated that the interaction of Zn and copper (Cu) is involved in the pathogenesis of Alzheimer's disease and vascular dementia. Furthermore, oxidative stress has been shown to play a significant role in the pathogenesis of various metal ions induced neuronal death...
November 6, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29121354/exogenous-glutathione-enhances-cadmium-accumulation-and-alleviates-its-toxicity-in-populus-%C3%A3-canescens
#19
Shen Ding, Chaofeng Ma, Wenguang Shi, Wenzhe Liu, Yan Lu, Qifeng Liu, Zhi-Bin Luo
Glutathione (GSH) plays an important role in cadmium (Cd) tolerance in woody plants, but the underlying mechanisms remain largely unknown. To elucidate the physiological and transcriptional regulation mechanisms of GSH-mediated Cd tolerance in woody plants, we exposed Populus × canescens (Ait.) Smith saplings to either 0 or 75 μM Cd together with one of three external GSH levels. Glutathione treatments include buthionine sulfoximine (BSO, an inhibitor of GSH biosynthesis), no external GSH and exogenous GSH...
November 7, 2017: Tree Physiology
https://www.readbyqxmd.com/read/29119337/toxic-metals-in-cigarettes-and-human-health-risk-assessment-associated-with-inhalation-exposure
#20
Nsikak U Benson, Winifred U Anake, Adebusayo E Adedapo, Omowunmi H Fred-Ahmadu, Olusegun O Ayejuyo
This study evaluated the concentrations of cadmium (Cd), copper (Cu), iron (Fe), manganese (Mn), lead (Pb), and zinc (Zn) in 10 branded cigarettes commonly consumed in Nigeria. Chemical sequential extraction method and pseudo-total metal digestion procedure were used for extraction of metals from filler tobacco and filter samples. Samples were analyzed using flame atomic absorption spectrometry (FAAS). The filler tobacco of cigarettes had Cd, Cu, Fe, Mn, Pb, and Zn concentrations in the ranges of 5.90-7.94, 18...
November 8, 2017: Environmental Monitoring and Assessment
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