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Wan L, Zhao L, Cao C, Gong D, Zeng X, Yang L. Fluorine removal from sodium tungstate ion exchange effluent by precipitation with addition of lanthanum chloride. Front Chem 2023; 11:1238644. [PMID: 37767339 PMCID: PMC10521580 DOI: 10.3389/fchem.2023.1238644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 08/30/2023] [Indexed: 09/29/2023] Open
Abstract
The waste water generated from the sodium tungstate ion exchange process of scheelite hydrometallurgical extraction contains a certain concentration of fluorine ion, which caused environmental pollution and harmed human health. In this study, a new method for removing fluorine from the wastewater by precipitation with addition of lanthanum chloride was proposed. In the process, fluorine was removed by from the solution as insoluble lanthanum fluoride precipitates. To explore the favourable conditions for the formation of lanthanum fluoride, thermodynamic analysis of the La-F-H2O system was conducted. Results show that lanthanum fluoride is stable when the solution pH value is between 1.0 and 10.0, and the lanthanum fluoride is gradually converted into lanthana hydroxide when the pH value is more than 10.0 at 298K. The effects of various parameters on the fluorine removal were studied, and the optimum process parameters were determined. More than 92% of the fluorine can be removed when the concentration of fluorine in the solution ranged from 60 to 400 mg/L, the dosage of lanthanum chloride was 1.3 times of the theoretical amount, the pH value was 8.0 at 60°C for 30 min. After removing fluorine from the solution, the resiual fluorine concentrtion was lower than 10 mg/L, which could meet the requirement of national wastewater discharge.
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Affiliation(s)
| | | | | | | | | | - Liang Yang
- Jiangxi University of Science and Technology, Ganzhou, Jiangxi, China
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Kaya C, Ugurlar F, Ashraf M, Alyemeni MN, Moustakas M, Ahmad P. 5-Aminolevulinic Acid Induces Chromium [Cr(VI)] Tolerance in Tomatoes by Alleviating Oxidative Damage and Protecting Photosystem II: A Mechanistic Approach. Plants (Basel) 2023; 12:plants12030502. [PMID: 36771587 PMCID: PMC9920640 DOI: 10.3390/plants12030502] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/24/2022] [Accepted: 01/17/2023] [Indexed: 05/13/2023]
Abstract
Chromium [Cr(VI)] pollution is a major environmental risk, reducing crop yields. 5-Aminolevunic acid (5-ALA) considerably improves plant abiotic stress tolerance by inducing hydrogen peroxide (H2O2) and nitric oxide (NO) signalling. Our investigation aimed to uncover the mechanism of tomato tolerance to Cr(VI) toxicity through the foliar application of 5-ALA for three days, fifteen days before Cr treatment. Chromium alone decreased plant biomass and photosynthetic pigments, but increased oxidative stress markers, i.e., H2O2 and lipid peroxidation (as MDA equivalent). Electrolyte leakage (EL), NO, nitrate reductase (NR), phytochelatins (PCs), glutathione (GSH), and enzymatic and non-enzymatic antioxidants were also increased. Foliar application of 5-ALA before Cr treatment improved plant growth and photosynthetic pigments, diminished H2O2, MDA content, and EL, and resulted in additional enhancements of enzymatic and non-enzymatic antioxidants, NR activity, and NO synthesis. In Cr-treated tomato seedlings, 5-ALA enhanced GSH and PCs, which modulated Cr sequestration to make it nontoxic. 5-ALA-induced Cr tolerance was further enhanced by sodium nitroprusside (SNP), a NO donor. When sodium tungstate (ST), a NR inhibitor, was supplied together with 5-ALA to Cr-treated plants, it eliminated the beneficial effects of 5-ALA by decreasing NR activity and NO synthesis, while the addition of SNP inverted the adverse effects of ST. We conclude that the mechanism by which 5-ALA induced Cr tolerance in tomato seedlings is mediated by NR-generated NO. Thus, NR and NO are twin players, reducing Cr toxicity in tomato plants via antioxidant signalling cascades.
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Affiliation(s)
- Cengiz Kaya
- Soil Science and Plant Nutrition Department, Harran University, 63200 Sanliurfa, Turkey
| | - Ferhat Ugurlar
- Soil Science and Plant Nutrition Department, Harran University, 63200 Sanliurfa, Turkey
| | - Muhammed Ashraf
- Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore 54600, Pakistan
| | | | - Michael Moustakas
- Department of Botany, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
- Correspondence:
| | - Parvaiz Ahmad
- Department of Botany, GDC, Jammu and Kashmir, Pulwama 192301, India
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Bian TT, Yan K, Han GX, An MX, Yang RY. [Effects of root abscisic acid on Na + transport and photosystem 2 in Helianthus tuberosus under salt stress]. Ying Yong Sheng Tai Xue Bao 2020; 31:508-514. [PMID: 32476344 DOI: 10.13287/j.1001-9332.202002.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The effects of root abscisic acid (ABA) signal on Na+ transport and photosystem 2 (PS2) in Jerusalem artichoke (Helianthus tuberosus) under salt stress (150 mmol·L-1 NaCl) were examined by applying ABA synthesis inhibitor sodium tungstate to roots. Sodium tungstate inhibited ABA synthesis in roots, reduced root Na+ efflux, and increased the efficiency of Na+ transport from roots to leaves under salt stress. Salt stress increased leaf Na+ content and did not affect leaf membrane lipid peroxidation, PS2 reaction center protein and PS2 maximum photochemical efficiency (Fv/Fm ). The inhibition on root ABA synthesis significantly increased leaf Na+ accumulation, aggravated leaf membrane lipid peroxidation, impaired PS2 reaction center protein, decreased Fv/Fm, and induced PS2 photoinhibition. In conclusion, root ABA signal was beneficial to reducing leaf Na+ accumulation and preventing PS2 oxidative damage by inducing root Na+ efflux and inhibiting Na+ transport to the aerial part in H. tuberosus under salt stress.
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Affiliation(s)
- Tian-Tian Bian
- School of Life Sciences, Ludong University, Yantai 264025, Shandong, China.,CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences CAS, Yantai 264003, Shandong, China
| | - Kun Yan
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences CAS, Yantai 264003, Shandong, China
| | - Guang-Xuan Han
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences CAS, Yantai 264003, Shandong, China
| | - Meng-Xin An
- School of Agriculture, Ludong University, Yantai 264025, Shandong, China
| | - Run-Ya Yang
- School of Life Sciences, Ludong University, Yantai 264025, Shandong, China
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Dkhilalli F, Megdiche Borchani S, Rasheed M, Barille R, Shihab S, Guidara K, Megdiche M. Characterizations and morphology of sodium tungstate particles. R Soc Open Sci 2018; 5:172214. [PMID: 30224991 PMCID: PMC6124057 DOI: 10.1098/rsos.172214] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Accepted: 07/05/2018] [Indexed: 06/08/2023]
Abstract
A solid-state reaction technique was used to synthesize polycrystalline Na2WO4. Preliminary X-ray studies revealed that the compound has a cubic structure at room temperature. The formation of the compound has been confirmed by X-ray powder diffraction studies and Raman spectroscopy. Electrical and dielectric properties of the compound have been studied using complex impedance spectroscopy in the frequency range 209 Hz-1 MHz and temperature range 586-679 K. The impedance data were modellized by an equivalent circuit consisting of series of a combination of grains and grains boundary. We use complex electrical modulus M* at various temperatures to analyse dielectric data. The modulus plots are characterized by the presence of two relaxation peaks thermally activated. The morphologies and the average particle size of the resultant sodium tungstate sample were demonstrated by atomic force microscopy, scanning electron microscopy and transmission electron microscopy. The thicknesses and optical constants of the sample have been calculated using ellipsometric measurements in the range of 200-22 000 nm by means of new amorphous dispersion formula which is the objective of the present work. The results were obtained for Na2WO4 particles from experimental (EXP) and measured (FIT) data showed an excellent agreement. In addition, the energy gap of the Na2WO4 sample has been determined using ellipsometry and confirmed by spectrophotometry measurements.
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Affiliation(s)
- F. Dkhilalli
- Faculty of Sciences, Laboratory of Spectroscopic Characterization and Optical Materials, University of Sfax, BP 1171, 3000 Sfax, Tunisia
- MOLTECH-Anjou, University of Angers/UMR CNRS 6200, 2 Boulevard Lavoisier, 49045 Angers, France
| | - S. Megdiche Borchani
- Faculty of Sciences, Laboratory of Spectroscopic Characterization and Optical Materials, University of Sfax, BP 1171, 3000 Sfax, Tunisia
- Higher Institute of Computing and Multimedia of Sfax (ISIMS), Technological Center of Sfax, BP 242, SakietEzzit, 3021 Sfax, Tunisia
| | - M. Rasheed
- MOLTECH-Anjou, University of Angers/UMR CNRS 6200, 2 Boulevard Lavoisier, 49045 Angers, France
| | - R. Barille
- MOLTECH-Anjou, University of Angers/UMR CNRS 6200, 2 Boulevard Lavoisier, 49045 Angers, France
| | - S. Shihab
- Department of Applied Sciences, University of Technology, Baghdad, Iraq
| | - K. Guidara
- Faculty of Sciences, Laboratory of Spectroscopic Characterization and Optical Materials, University of Sfax, BP 1171, 3000 Sfax, Tunisia
| | - M. Megdiche
- Faculty of Sciences, Laboratory of Spectroscopic Characterization and Optical Materials, University of Sfax, BP 1171, 3000 Sfax, Tunisia
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Hayek NS, Lucas NS, Warwar Damouny C, Gazit OM. Critical Surface Parameters for the Oxidative Coupling of Methane over the Mn-Na-W/SiO 2 Catalyst. ACS Appl Mater Interfaces 2017; 9:40404-40411. [PMID: 29067811 DOI: 10.1021/acsami.7b14941] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The work here presents a thorough evaluation of the effect of Mn-Na-W/SiO2 catalyst surface parameters on its performance in the oxidative coupling of methane (OCM). To do so, we used microporous dealuminated β-zeolite (Zeo), or mesoporous SBA-15 (SBA), or macroporous fumed silica (Fum) as precursors for catalyst preparation, together with Mn nitrate, Mn acetate and Na2WO4. Characterizing the catalysts by inductively coupled plasma-optical emission spectroscopy, N2 physisorption, X-ray diffraction, high-resolution scanning electron microscopy-energy-dispersive spectroscopy, X-ray photoelectron spectroscopy, and catalytic testing enabled us to identify critical surface parameters that govern the activity and C2 selectivity of the Mn-Na-W/SiO2 catalyst. Although the current paradigm views the phase transition of silica to α-cristobalite as the critical step in obtaining dispersed and stable metal sites, we show that the choice of precursors is equally or even more important with respect to tailoring the right surface properties. Specifically, the SBA-based catalyst, characterized by relatively closed surface porosity, demonstrated low activity and low C2 selectivity. By contrast, for the same composition, the Zeo-based catalyst showed an open surface pore structure, which translated up to fourfold higher activity and enhanced selectivity. By varying the overall composition of the Zeo catalysts, we show that reducing the overall W concentration reduces the size of the Na2WO4 species and increases the catalytic activity linearly as much as fivefold higher than the SBA catalyst. This linear dependence correlates well to the number of interfaces between the Na2WO4 and Mn2O3 species. Our results combined with prior studies lead us to single out the interface between Na2WO4 and Mn2O3 as the most probable active site for OCM using this catalyst. Synergistic interactions between the various precursors used and the phase transition are discussed in detail, and the conclusions are correlated to surface properties and catalysis.
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Affiliation(s)
- Naseem S Hayek
- The Wolfson Faculty of Chemical Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel
| | - Nishita S Lucas
- The Wolfson Faculty of Chemical Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel
| | - Christine Warwar Damouny
- The Wolfson Faculty of Chemical Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel
| | - Oz M Gazit
- The Wolfson Faculty of Chemical Engineering, Technion-Israel Institute of Technology , Haifa 3200003, Israel
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Khader A, Sherman LS, Rameshwar P, Arinzeh TL. Sodium Tungstate for Promoting Mesenchymal Stem Cell Chondrogenesis. Stem Cells Dev 2016; 25:1909-1918. [PMID: 27615276 PMCID: PMC5165671 DOI: 10.1089/scd.2016.0158] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 09/09/2016] [Indexed: 02/07/2023] Open
Abstract
Articular cartilage has a limited ability to heal. Mesenchymal stem cells (MSCs) derived from the bone marrow have shown promise as a cell type for cartilage regeneration strategies. In this study, sodium tungstate (Na2WO4), which is an insulin mimetic, was evaluated for the first time as an inductive factor to enhance human MSC chondrogenesis. MSCs were seeded onto three-dimensional electrospun scaffolds in growth medium (GM), complete chondrogenic induction medium (CCM) containing insulin, and CCM without insulin. Na2WO4 was added to the media leading to final concentrations of 0, 0.01, 0.1, and 1 mM. Chondrogenic differentiation was assessed by biochemical analyses, immunostaining, and gene expression. Cytotoxicity using human peripheral blood mononuclear cells (PBMCS) was also investigated. The chondrogenic differentiation of MSCs was enhanced in the presence of low concentrations of Na2WO4 compared to control, without Na2WO4. In the induction medium containing insulin, cells in 0.01 mM Na2WO4 produced significantly higher sulfated glycosaminoglycans, collagen type II, and chondrogenic gene expression than all other groups at day 28. Cells in 0.1 mM Na2WO4 had significantly higher collagen II production and significantly higher sox-9 and aggrecan gene expression compared to control at day 28. Cells in GM and induction medium without insulin containing low concentrations of Na2WO4 also expressed chondrogenic markers. Na2WO4 did not stimulate PBMC proliferation or apoptosis. The results demonstrate that Na2WO4 enhances chondrogenic differentiation of MSCs, does not have a toxic effect, and may be useful for MSC-based approaches for cartilage repair.
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Affiliation(s)
- Ateka Khader
- 1 Department of Biomedical Engineering, New Jersey Institute of Technology , Newark, New Jersey
| | - Lauren S Sherman
- 2 Department of Medicine-Hematology/Oncology, Rutgers-New Jersey Medical School , Newark, New Jersey
| | - Pranela Rameshwar
- 2 Department of Medicine-Hematology/Oncology, Rutgers-New Jersey Medical School , Newark, New Jersey
| | - Treena L Arinzeh
- 1 Department of Biomedical Engineering, New Jersey Institute of Technology , Newark, New Jersey
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Bulut M, Dönmez BÖ, Öztürk N, Başaranlar G, Kencebay Manas C, Derin N, Özdemir S. Effect of sodium tungstate on visual evoked potentials in diabetic rats. Int J Ophthalmol 2016; 9:677-81. [PMID: 27275420 DOI: 10.18240/ijo.2016.05.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 09/10/2015] [Indexed: 11/23/2022] Open
Abstract
AIM To evaluate the effect of sodium tungstate on visual evoked potentials (VEPs) in diabetic rats. METHODS Wistar rats were randomly divided into three groups as normal control, diabetic control and diabetic rats treated with sodium tungstate. Diabetes was induced by single intraperitoneal injection of streptozotocin (50 mg/kg). Sodium tungstate [40 mg/(kg·d)] was administered for 12wk and then VEPs were recorded. Additionally, thiobarbituric acid reactive substance (TBARS) levels were measured in brain tissues. RESULTS The latencies of P1, N1, P2, N2 and P3 waves were significantly prolonged in diabetic rats compared with control group. Diabetes mellitus caused an increase in the lipid peroxidation process that was accompanied by changes in VEPs. However, prolonged latencies of VEPs for all components returned to control levels in sodium tungstate-treated group. The treatment of sodium tungstate significantly decreased brain TBARS levels and depleted the prolonged latencies of VEP components compared with diabetic control group. CONCLUSION Sodium tungstate shows protective effects on visual pathway in diabetic rats, and it can be worthy of further study for potential use.
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Affiliation(s)
- Mehmet Bulut
- Department of Ophthalmology, Antalya Education and Research Hospital, Antalya 07070, Turkey
| | - Barış Özgür Dönmez
- Department of Nutrition and Dietetics, School of Health, Akdeniz University, Antalya 07070, Turkey
| | - Nihal Öztürk
- Department of Biophysics, Faculty of Medicine, Akdeniz University, Antalya 07070, Turkey
| | - Göksun Başaranlar
- Department of Biophysics, Faculty of Medicine, Akdeniz University, Antalya 07070, Turkey
| | - Ceren Kencebay Manas
- Department of Biophysics, Faculty of Medicine, Akdeniz University, Antalya 07070, Turkey
| | - Narin Derin
- Department of Biophysics, Faculty of Medicine, Akdeniz University, Antalya 07070, Turkey
| | - Semir Özdemir
- Department of Biophysics, Faculty of Medicine, Akdeniz University, Antalya 07070, Turkey
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Fortes AD. Crystal structures of spinel-type Na2MoO4 and Na2WO4 revisited using neutron powder diffraction. Acta Crystallogr E Crystallogr Commun 2015; 71:592-6. [PMID: 26090129 PMCID: PMC4459306 DOI: 10.1107/s2056989015008774] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 05/05/2015] [Indexed: 11/10/2022]
Abstract
High-precision structural parameters for cubic Na2MoO4 and Na2WO4 are reported based on refinement of high-resolution time-of-flight neutron powder diffraction data. Complementary Raman spectra are also provided. Time-of-flight neutron powder diffraction data have been collected from Na2MoO4 and Na2WO4 to a resolution of sin (θ)/λ = 1.25 Å−1, which is substantially better than the previous analyses using Mo Kα X-rays, providing roughly triple the number of measured reflections with respect to the previous studies [Okada et al. (1974 ▸). Acta Cryst. B30, 1872–1873; Bramnik & Ehrenberg (2004 ▸). Z. Anorg. Allg. Chem.630, 1336–1341]. The unit-cell parameters are in excellent agreement with literature data [Swanson et al. (1962 ▸). NBS Monograph No. 25, sect. 1, pp. 46–47] and the structural parameters for the molybdate agree very well with those of Bramnik & Ehrenberg (2004 ▸). However, the tungstate structure refinement of Okada et al. (1974 ▸) stands apart as being conspicuously inaccurate, giving significantly longer W—O distances, 1.819 (8) Å, and shorter Na—O distances, 2.378 (8) Å, than are reported here or in other simple tungstates. As such, this work represents an order-of-magnitude improvement in precision for sodium molybdate and an equally substantial improvement in both accuracy and precision for sodium tungstate. Both compounds adopt the spinel structure type. The Na+ ions have site symmetry .-3m and are in octahedral coordination while the transition metal atoms have site symmetry -43m and are in tetrahedral coordination.
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Affiliation(s)
- A Dominic Fortes
- ISIS Facility, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, England ; Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, England ; Department of Earth and Planetary Sciences, Birkbeck, University of London, Malet Street, London WC1E 7HX, England
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Fernández-Ruiz R, Pino M, Hurtado B, García de Frutos P, Caballo C, Escolar G, Gomis R, Diaz-Ricart M. Role of sodium tungstate as a potential antiplatelet agent. Drug Des Devel Ther 2015; 9:2777-86. [PMID: 26060394 PMCID: PMC4454192 DOI: 10.2147/dddt.s77221] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Purpose Platelet inhibition is a key strategy in the management of atherothrombosis. However, the large variability in response to current strategies leads to the search for alternative inhibitors. The antiplatelet effect of the inorganic salt sodium tungstate (Na2O4W), a protein tyrosine phosphatase 1B (PTP1B) inhibitor, has been investigated in this study. Methods Wild-type (WT) and PTP1B knockout (PTP1B−/−) mice were treated for 1 week with Na2O4W to study platelet function with the platelet function analyzer PFA-100, a cone-and-plate analyzer, a flat perfusion chamber, and thrombus formation in vivo. Human blood aliquots were incubated with Na2O4W for 1 hour to measure platelet function using the PFA-100 and the annular perfusion chamber. Aggregometry and thromboelastometry were also performed. Results In WT mice, Na2O4W treatment prolonged closure times in the PFA-100 and decreased the surface covered (%SC) by platelets on collagen. Thrombi formed in a thrombosis mice model were smaller in animals treated with Na2O4W (4.6±0.7 mg vs 8.9±0.7 mg; P<0.001). Results with Na2O4W were similar to those in untreated PTP1B−/− mice (5.0±0.3 mg). Treatment of the PTP1B−/− mice with Na2O4W modified only slightly this response. In human blood, a dose-dependent effect was observed. At 200 μM, closure times in the PFA-100 were prolonged. On denuded vessels, %SC and thrombi formation (%T) decreased with Na2O4W. Neither the aggregating response nor the viscoelastic clot properties were affected. Conclusion Na2O4W decreases consistently the hemostatic capacity of platelets, inhibiting their adhesive and cohesive properties under flow conditions in mice and in human blood, resulting in smaller thrombi. Although Na2O4W may be acting on platelet PTP1B, other potential targets should not be disregarded.
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Affiliation(s)
- Rebeca Fernández-Ruiz
- Diabetes and Obesity Research Laboratory, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Rosellón, Barcelona, Spain ; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas, Barcelona, Spain
| | - Marc Pino
- Hemotherapy-Hemostasis, Hospital Clínic, Universidad de Barcelona, IDIBAPS, Villarroel, Barcelona, Spain
| | - Begoña Hurtado
- Institutode Investigaciones Biomédicas de Barcelona, Consejo Superior de Investigaciones Científicas, Institut d'Investigacions Biomediques August Pi i Sunyer, Rosellón, Barcelona, Spain
| | - Pablo García de Frutos
- Institutode Investigaciones Biomédicas de Barcelona, Consejo Superior de Investigaciones Científicas, Institut d'Investigacions Biomediques August Pi i Sunyer, Rosellón, Barcelona, Spain
| | - Carolina Caballo
- Hemotherapy-Hemostasis, Hospital Clínic, Universidad de Barcelona, IDIBAPS, Villarroel, Barcelona, Spain
| | - Ginés Escolar
- Hemotherapy-Hemostasis, Hospital Clínic, Universidad de Barcelona, IDIBAPS, Villarroel, Barcelona, Spain
| | - Ramón Gomis
- Diabetes and Obesity Research Laboratory, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Rosellón, Barcelona, Spain ; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas, Barcelona, Spain ; Hospital Clinic, Universitat de Barcelona, Villarroel, Barcelona, Spain
| | - Maribel Diaz-Ricart
- Hemotherapy-Hemostasis, Hospital Clínic, Universidad de Barcelona, IDIBAPS, Villarroel, Barcelona, Spain
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Abstract
Tungsten is a relatively rare metal with numerous applications, most notably in machine tools, catalysts, and superalloys. In 2003, tungsten was nominated for study under the National Toxicology Program, and in 2011, it was nominated for human health assessment under the US Environmental Protection Agency's (EPA) Integrated Risk Information System. In 2005, the Agency for Toxic Substances and Disease Registry (ATSDR) issued a toxicological profile for tungsten, identifying several data gaps in the hazard assessment of tungsten. By filling the data gaps identified by the ATSDR, this review serves as an update to the toxicological profile for tungsten and tungsten substances. A PubMed literature search was conducted to identify reports published during the period 2004-2014, in order to gather relevant information related to tungsten toxicity. Additional information was also obtained directly from unpublished studies from within the tungsten industry. A systematic approach to evaluate the quality of data was conducted according to published criteria. This comprehensive review has gathered new toxicokinetic information and summarizes the details of acute and repeated-exposure studies that include reproductive, developmental, neurotoxicological, and immunotoxicological endpoints. Such new evidence involves several relevant studies that must be considered when regulators estimate and propose a tungsten reference or concentration dose.
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Affiliation(s)
- Ranulfo Lemus
- International Tungsten Industry Association (ITIA), London, UK
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Zhang Y, Liu H, Yin H, Wang W, Zhao X, Du Y. Nitric oxide mediates alginate oligosaccharides-induced root development in wheat (Triticum aestivum L.). Plant Physiol Biochem 2013; 71:49-56. [PMID: 23872742 DOI: 10.1016/j.plaphy.2013.06.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2013] [Accepted: 06/25/2013] [Indexed: 05/27/2023]
Abstract
Alginate oligosaccharides (AOS), which are marine oligosaccharides, are involved in regulating plant root growth, but the promotion mechanism for AOS remains unclear. Here, AOS (10-80 mg L(-1)) were found to induce the generation of nitric oxide (NO) in the root system of wheat (Triticum aestivum L.), which promoted the formation and elongation of wheat roots in a dose-dependent manner. NO inhibitors suggested that nitrate reductase (NR), rather than nitric oxide synthase (NOS), was essential for AOS-induced root development. Further studies confirmed that AOS-induced NO generation in wheat roots by up-regulating the gene expression and enzyme activity of NR at the post-transcriptional level. The anatomy and RT-PCR results showed that AOS accelerated the division and growth of stele cells, leading to an increase in the ratio of stele area to root transverse area. This could be inhibited by the NR inhibitor, sodium tungstate, which indicated that NO catalyzed by the NR was involved in AOS regulation of root development. Taken together, in the early stage of AOS-induced root development, NO generation was a novel mechanism by which AOS regulated plant growth. The results also showed that this marine resource could be widely used for crop development.
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Affiliation(s)
- Yunhong Zhang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Liaoning Provincial Key Laboratory of Carbohydrates, 457 Zhongshan Road, Dalian 116023, Liaoning, PR China
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