151
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Shape-controlled fabrication of magnetite silver hybrid nanoparticles with high performance magnetic hyperthermia. Biomaterials 2017; 124:35-46. [DOI: 10.1016/j.biomaterials.2017.01.043] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 01/10/2017] [Accepted: 01/28/2017] [Indexed: 11/19/2022]
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152
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Valerio-García RC, Carbajal-Hernández AL, Martínez-Ruíz EB, Jarquín-Díaz VH, Haro-Pérez C, Martínez-Jerónimo F. Exposure to silver nanoparticles produces oxidative stress and affects macromolecular and metabolic biomarkers in the goodeid fish Chapalichthys pardalis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 583:308-318. [PMID: 28117161 DOI: 10.1016/j.scitotenv.2017.01.070] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 01/10/2017] [Accepted: 01/11/2017] [Indexed: 06/06/2023]
Abstract
Silver nanoparticles (AgNPs) are the most commercialized nanomaterial worldwide, mainly due to their microbicidal activity. Although, AgNPs have been shown to be toxic to aquatic species, their effect on endemic fish, like Goodeidae, has not been demonstrated. Endemic species are under strong pressures by anthropogenic contamination and destruction of their habitat; therefore, we studied adult Chapalichthys pardalis, an endemic fish of Mexico. We evaluated the toxic effect of AgNPs through oxidative stress, macromolecular and metabolic biomarkers. We determined the LC50 (96h) and performed subchronic tests (21days) using sublethal AgNPs concentrations (equivalent to CL1 and CL10). At the end of the bioassay, we quantified 10 stress biomarkers in the liver, gills, and muscle, including the antioxidant enzymes (superoxide dismutase [SOD], catalase [CAT], and glutathione [GPx]), thiobarbituric acid reactive species (TBARS), protein oxidation (CO), macromolecules (proteins, lipids, and carbohydrates), and metabolites (glucose and lactate). In addition, we determined the integrated biomarkers response (IBR). LC50 was of 10.32mgL-1. Results of subchronic exposure (21days) revealed that AgNPs produce oxidative stress in C. pardalis adults, as evidenced by a diminution in antioxidant enzymes activity and an increase in TBARS and oxidized proteins. AgNPs also diminished levels of macromolecules and generated a high-energy consumption, reflected in the reduction of glucose levels, although lactate levels were not altered. The IBR analysis evidenced that the largest effect was produced in organisms exposed to LC10, being the liver and gills the organs with the greatest damage. Results demonstrated that exposure to AgNPs induces acute and chronic toxic effects on C. pardalis and forewarns about the impact that these nanomaterials can exert on these ecologically relevant aquatic organisms.
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Affiliation(s)
- Roberto Carlos Valerio-García
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Carpio y Plan de Ayala S/N, Col. Santo Tomas, Mexico City C.P. 11340, Mexico
| | - Ana Laura Carbajal-Hernández
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Carpio y Plan de Ayala S/N, Col. Santo Tomas, Mexico City C.P. 11340, Mexico
| | - Erika Berenice Martínez-Ruíz
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Carpio y Plan de Ayala S/N, Col. Santo Tomas, Mexico City C.P. 11340, Mexico
| | - Víctor Hugo Jarquín-Díaz
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Carpio y Plan de Ayala S/N, Col. Santo Tomas, Mexico City C.P. 11340, Mexico
| | - Catalina Haro-Pérez
- Universidad Autónoma Metropolitana, Av. San Pablo No. 180, Col. Reynosa Tamaulipas, Azcapotzalco, Mexico City C.P. 02200, Mexico
| | - Fernando Martínez-Jerónimo
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Carpio y Plan de Ayala S/N, Col. Santo Tomas, Mexico City C.P. 11340, Mexico.
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153
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Mao Z, Xie R, Fu D, Zhang L, Xu H, Zhong Y, Sui X. PAN supported Ag-AgBr@Bi20TiO32 electrospun fiber mats with efficient visible light photocatalytic activity and antibacterial capability. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2016.12.027] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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154
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Olenin AY. Methods of nonenzymatic determination of hydrogen peroxide and related reactive oxygen species. JOURNAL OF ANALYTICAL CHEMISTRY 2017. [DOI: 10.1134/s1061934817030108] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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155
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Jiang X, Wang L, Ji Y, Tang J, Tian X, Cao M, Li J, Bi S, Wu X, Chen C, Yin JJ. Interference of Steroidogenesis by Gold Nanorod Core/Silver Shell Nanostructures: Implications for Reproductive Toxicity of Silver Nanomaterials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1602855. [PMID: 28009471 DOI: 10.1002/smll.201602855] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 11/09/2016] [Indexed: 06/06/2023]
Abstract
As a widely used nanomaterial in daily life, silver nanomaterials may cause great concern to female reproductive system as they are found to penetrate the blood-placental barrier and gain access to the ovary. However, it is largely unknown about how silver nanomaterials influence ovarian physiology and functions such as hormone production. This study performs in vitro toxicology study of silver nanomaterials, focusing especially on cytotoxicity and steroidogenesis and explores their underlying mechanisms. This study exposes primary rat granulosa cells to gold nanorod core/silver shell nanostructures (Au@Ag NRs), and compares outcomes with cells exposed to gold nanorods. The Au@Ag NRs generate more reactive oxygen species and reduce mitochondrial membrane potential and less production of adenosine triphosphate. Au@Ag NRs promote steroidogenesis, including progesterone and estradiol, in a time- and dose-dependent manner. Chemical reactivity and transformation of Au@Ag NRs are then studied by electron spin resonance spectroscopy and X-ray absorption near edge structure, which analyze the generation of free radical and intracellular silver species. Results suggest that both particle-specific activity and intracellular silver ion release of Au@Ag NR contribute to the toxic response of granulosa cells.
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Affiliation(s)
- Xiumei Jiang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Ambient Particles Health Effects and Prevention Techniques, National Center for Nanoscience and Technology and Institute of High Energy Physics, Beijing, 100190, China
| | - Liming Wang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Ambient Particles Health Effects and Prevention Techniques, National Center for Nanoscience and Technology and Institute of High Energy Physics, Beijing, 100190, China
| | - Yinglu Ji
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Jinglong Tang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Ambient Particles Health Effects and Prevention Techniques, National Center for Nanoscience and Technology and Institute of High Energy Physics, Beijing, 100190, China
| | - Xin Tian
- Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD, 20740, USA
| | - Mingjing Cao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Ambient Particles Health Effects and Prevention Techniques, National Center for Nanoscience and Technology and Institute of High Energy Physics, Beijing, 100190, China
| | - Jingxuan Li
- The General Hospital of the Air Force, PLA, Beijing, 100142, China
| | - Shuying Bi
- The General Hospital of the Air Force, PLA, Beijing, 100142, China
| | - Xiaochun Wu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Chunying Chen
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Ambient Particles Health Effects and Prevention Techniques, National Center for Nanoscience and Technology and Institute of High Energy Physics, Beijing, 100190, China
| | - Jun-Jie Yin
- Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD, 20740, USA
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156
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Park CM, Heo J, Yoon Y. Oxidative degradation of bisphenol A and 17α-ethinyl estradiol by Fenton-like activity of silver nanoparticles in aqueous solution. CHEMOSPHERE 2017; 168:617-622. [PMID: 27838031 DOI: 10.1016/j.chemosphere.2016.11.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 11/02/2016] [Accepted: 11/04/2016] [Indexed: 06/06/2023]
Abstract
Silver nanoparticles (AgNPs) have been reported to have antibacterial activities and cytotoxicity, resulting from the dissolved silver cation (Ag+) and its soluble complexes. However, to our knowledge, little has been reported about their potential use in degrading organic contaminants such as endocrine-disrupting compounds in aqueous solution. In this first report on the subject, we examined the effectiveness of the oxidative degradation of bisphenol A (BPA) and 17α-ethinyl estradiol (EE2) in water by reactive oxygen species formed during the decomposition of H2O2, assisted by polyvinylpyrrolidone (PVP)-stabilized AgNPs. The dissolution of AgNPs accompanied generation of OH at low pH. The fully dispersed PVP-AgNPs in the presence of H2O2 exhibited fast degradation kinetics for EE2 at a typical aquatic condition of pH (6-7). The oxidation kinetics of BPA and EE2 by PVP-AgNPs can be interpreted using three different modeling approaches: an initial pseudo-first-order, a retarded first-order rate, and Behnajady-Modirshahla-Ghanbery kinetic equation. The findings showed that AgNPs may have potential to facilitate the in situ oxidation for emerging contaminants in the aqueous environment.
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Affiliation(s)
- Chang Min Park
- Department of Civil and Environmental Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208, USA
| | - Jiyong Heo
- Department of Civil and Environmental Engineering, Korea Army Academy at Young-Cheon, 495 Hogook-ro, Kokyungmeon, Young-Cheon, Gyeongbuk 38900, South Korea
| | - Yeomin Yoon
- Department of Civil and Environmental Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208, USA.
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157
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Mansour HH, Eid M, El-Arnaouty MB. Effect of silver nanoparticles synthesized by gamma radiation on the cytotoxicity of doxorubicin in human cancer cell lines and experimental animals. Hum Exp Toxicol 2017; 37:38-50. [DOI: 10.1177/0960327116689717] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- HH Mansour
- Health Radiation Research Department, Atomic Energy Authority, Nasr City, Cairo, Egypt
| | - M Eid
- Polymer Chemistry Department, National Centre for Radiation Research and Technology, Atomic Energy Authority, Nasr City, Cairo, Egypt
| | - MB El-Arnaouty
- Health Radiation Research Department, Atomic Energy Authority, Nasr City, Cairo, Egypt
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158
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Rojas-Andrade MD, Chata G, Rouholiman D, Liu J, Saltikov C, Chen S. Antibacterial mechanisms of graphene-based composite nanomaterials. NANOSCALE 2017; 9:994-1006. [PMID: 28054094 DOI: 10.1039/c6nr08733g] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Pathogenic bacteria are gaining resistance to conventional antibiotics at an alarming rate due to overuse and rapid transfer of resistance genes between bacterial populations. As bacterial resistance to antibiotics causes millions of fatalities worldwide, it is of urgent importance to develop a new class of antibiotic materials with both broad-spectrum bactericidal activity and suitable biocompatibility. Graphene derivatives are rapidly emerging as an extremely promising class of antimicrobial materials due to their diverse bactericidal mechanisms and relatively low cytotoxicity towards mammalian cells. By combining graphene derivatives with currently utilized antibacterial metal and metal-oxide nanostructures, composite materials with exceptional bactericidal activity can be achieved. In this review, the antibacterial activities of graphene derivatives as well as their metal and metal-oxide composite nanostructures will be presented. The synthetic methodology for these various materials will be briefly mentioned, and emphasis will be placed on the evaluation of their mechanisms of action. This information will provide a valuable insight into the current understanding of the interactions governing the microbial toxicity of graphene-based composite nanostructures.
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Affiliation(s)
- Mauricio D Rojas-Andrade
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, USA.
| | - Gustavo Chata
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, USA.
| | - Dara Rouholiman
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, USA.
| | - Junli Liu
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, USA. and School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China
| | - Chad Saltikov
- Department of Microbiology and Environmental Toxicology, University of California, 1156 High Street, Santa Cruz, California 95064, USA.
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, USA.
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159
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A M S P, I VG, M SP, U VG, J J LP, J RU. Halide removal from aqueous solution by novel silver-polymeric materials. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 573:1125-1131. [PMID: 27697745 DOI: 10.1016/j.scitotenv.2016.08.071] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 08/09/2016] [Accepted: 08/10/2016] [Indexed: 06/06/2023]
Abstract
The objective of this study was to analyze the behavior of a new material, silver-doped polymeric cloth (Ag-cloth), in the removal of bromide and iodide from waters. Silver is immobilized on the cloth, guaranteeing selective adsorption of the halide ions as retained silver halides that therefore do not pass into the solution. Results indicate that Ag0 reacts with H2O2 in the first phases of the process, yielding Ag+ and superoxide radical; however, as the process advances, this radical favors Ag+ reduction. Increases in the concentration of H2O2 augment the capacity of the Ag-cloth to remove halides from the medium up to a maximum concentration (55μM), above which the removal capacity remains constant (Xm≅1.3-1.8mg halide/g Ag-cloth). Thus, when there is excess H2O2 in the medium, secondary competitive reactions that take place in the process guarantee a constant Ag+ concentration, which defines the maximum adsorption capacity of Ag-cloth, reducing its ability to remove halides. Ag-cloth has a higher capacity to remove iodide than bromide, and the presence of organic matter or chloride reduces its capacity to remove iodide or bromide from water. The results obtained shown that the capacity of Ag0 with H2O2 significantly varies as a function of the medium pH from 1mg Br-/g Ag-cloth at very low pH to 1.6mg/g Ag-cloth at pH9.
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Affiliation(s)
- Polo A M S
- Department of Inorganic Chemistry, University of Granada. 18071, Granada, Spain
| | - Velo-Gala I
- Department of Inorganic Chemistry, University of Granada. 18071, Granada, Spain
| | - Sánchez-Polo M
- Department of Inorganic Chemistry, University of Granada. 18071, Granada, Spain; Eawag, Swiss Federal Institute for Aquatic Science and Technology, CH-8600, Dübendorf, Switzerland
| | - von Gunten U
- Eawag, Swiss Federal Institute for Aquatic Science and Technology, CH-8600, Dübendorf, Switzerland; School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytecnique Fédérale de Lausanne, Ch-1015 Lausanne, Switzerland
| | - López-Peñalver J J
- Department of Inorganic Chemistry, University of Granada. 18071, Granada, Spain
| | - Rivera-Utrilla J
- Department of Inorganic Chemistry, University of Granada. 18071, Granada, Spain
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160
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Photo-mediated optimized synthesis of silver nanoparticles for the selective detection of Iron(III), antibacterial and antioxidant activity. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 71:1004-1019. [PMID: 27987654 DOI: 10.1016/j.msec.2016.11.013] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Revised: 09/12/2016] [Accepted: 11/06/2016] [Indexed: 11/21/2022]
Abstract
The AgNPs synthesized by green method have shown great potential in several applications such as biosensing, biomedical, catalysis, electronic etc. The present study deals with the selective colorimetric detection of Fe3+ using photoinduced green synthesized AgNPs. For the synthesis purpose, an aqueous extract of Croton bonplandianum (AEC) was used as a reducing and stabilizing agent. The biosynthesis was confirmed by UV-visible spectroscopy where an SPR band at λmax 436nm after 40s and 428nm after 30min corresponded to the existence of AgNPs. The optimum conditions for biosynthesis of AgNPs were 30min sunlight exposure time, 5.0% (v/v) AEC inoculum dose and 4mM AgNO3 concentration. The stability of synthesized AgNPs was monitored up to 9months. The size and shape of AgNPs with average size 19.4nm were determined by Field Emission Scanning Electron Microscope (FE-SEM) and High-Resolution Transmission Electron Microscope (HR-TEM). The crystallinity was determined by High-Resolution X-ray Diffractometer (HR-XRD) and Selected Area Electron Diffraction (SAED) pattern. The chemical and elemental compositions were determined by Fourier Transformed Infrared Spectroscopy (FTIR) and Energy Dispersive X-ray Spectroscopy (EDX) respectively. The Atomic Force Microscopy (AFM) images represented the lateral and 3D topological characteristics of AgNPs. The XPS analysis confirmed the presence of two individual peaks which attributed to the Ag 3d3/2 and Ag 3d5/2 binding energies corresponding to the presence of metallic silver. The biosynthesized AgNPs showed potent antibacterial activity against both gram-positive and gram-negative bacterial strains as well as antioxidant activity. On the basis of results and facts, a probable mechanism was also proposed to explore the possible route of AgNPs synthesis, colorimetric detection of Fe3+, antibacterial and antioxidant activity.
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161
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Silver nanoparticles: Significance of physicochemical properties and assay interference on the interpretation of in vitro cytotoxicity studies. Toxicol In Vitro 2016; 38:179-192. [PMID: 27816503 DOI: 10.1016/j.tiv.2016.10.012] [Citation(s) in RCA: 138] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 09/29/2016] [Accepted: 10/31/2016] [Indexed: 01/08/2023]
Abstract
Silver nanoparticles (AgNPs) have generated a great deal of interest in the research, consumer product, and medical product communities due to their antimicrobial and anti-biofouling properties. However, in addition to their antimicrobial action, concerns have been expressed about the potential adverse human health effects of AgNPs. In vitro cytotoxicity studies often are used to characterize the biological response to AgNPs and the results of these studies may be used to identify hazards associated with exposure to AgNPs. Various factors, such as nanomaterial size (diameter), surface area, surface charge, redox potential, surface functionalization, and composition play a role in the development of toxicity in in vitro test systems. In addition, the interference of AgNPs with in vitro cytotoxicity assays may result in false negative or false positive results in some in vitro biological tests. The goal of this review is to: 1) summarize the impact of physical-chemical parameters, including size, shape, surface chemistry and aggregate formation on the in vitro cytotoxic effects of AgNPs; and 2) explore the nature of AgNPs interference in in vitro cytotoxicity assays.
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162
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Cheng HJ, Wu TH, Chien CT, Tu HW, Cha TS, Lin SY. Corrosion-Activated Chemotherapeutic Function of Nanoparticulate Platinum as a Cisplatin Resistance-Overcoming Prodrug with Limited Autophagy Induction. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:6124-6133. [PMID: 27717137 DOI: 10.1002/smll.201602374] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 08/26/2016] [Indexed: 06/06/2023]
Abstract
Despite nanoparticulate platinum (nano-Pt) has been validated to be acting as a platinum-based prodrug for anticancer therapy, the key factor in controlling its cytotoxicity remains to be clarified. In this study, it is found that the corrosion susceptibility of nano-Pt can be triggered by inducing the oxidization of superficial Pt atoms, which can kill both cisplatin-sensitive/resistance cancer cells. Direct evidence in the oxidization of superficial Pt atoms is validated to observe the formation of platinum oxides by X-ray absorption spectroscopy. The cytotoxicity is originated from the dissolution of nano-Pt followed by the release of highly toxic Pt ions during the corrosion process. Additionally, the limiting autophagy induction by nano-Pt might prevent cancer cells from acquiring autophagy-related drug resistance. With such advantages, the possibility of further autophagy-related drug resistance could be substantially reduced or even eliminated in cancer cells treated with nano-Pt. Moreover, nano-Pt is demonstrated to kill cisplatin-resistant cancer cells not only by inducing apoptosis but also by inducing necrosis for pro-inflammatory/inflammatory responses. Thus, nano-Pt treatment might bring additional therapeutic benefits by regulating immunological responses in tumor microenvironment. These findings support the idea that utilizing nano-Pt for its cytotoxic effects might potentially benefit patients with cisplatin resistance in clinical chemotherapy.
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Affiliation(s)
- Hsien-Jen Cheng
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, 35 Keyan Road, Zhunan, 35053, Taiwan
| | - Te-Haw Wu
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, 35 Keyan Road, Zhunan, 35053, Taiwan
| | - Chih-Te Chien
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, 35 Keyan Road, Zhunan, 35053, Taiwan
| | - Hai-Wei Tu
- National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Ting-Shan Cha
- National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Shu-Yi Lin
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, 35 Keyan Road, Zhunan, 35053, Taiwan
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163
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Kurtjak M, Vukomanović M, Kramer L, Suvorov D. Biocompatible nano-gallium/hydroxyapatite nanocomposite with antimicrobial activity. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2016; 27:170. [PMID: 27704374 DOI: 10.1007/s10856-016-5777-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Accepted: 09/02/2016] [Indexed: 06/06/2023]
Abstract
Intensive research in the area of medical nanotechnology, especially to cope with the bacterial resistance against conventional antibiotics, has shown strong antimicrobial action of metallic and metal-oxide nanomaterials towards a wide variety of bacteria. However, the important remaining problem is that nanomaterials with highest antibacterial activity generally express also a high level of cytotoxicity for mammalian cells. Here we present gallium nanoparticles as a new solution to this problem. We developed a nanocomposite from bioactive hydroxyapatite nanorods (84 wt %) and antibacterial nanospheres of elemental gallium (16 wt %) with mode diameter of 22 ± 11 nm. In direct comparison, such nanocomposite with gallium nanoparticles exhibited better antibacterial properties against Pseudomonas aeruginosa and lower in-vitro cytotoxicity for human lung fibroblasts IMR-90 and mouse fibroblasts L929 (efficient antibacterial action and low toxicity from 0.1 to 1 g/L) than the nanocomposite of hydroxyapatite and silver nanoparticles (efficient antibacterial action and low toxicity from 0.2 to 0.25 g/L). This is the first report of a biomaterial composite with gallium nanoparticles. The observed strong antibacterial properties and low cytotoxicity make the investigated material promising for the prevention of implantation-induced infections that are frequently caused by P. aeruginosa.
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Affiliation(s)
- Mario Kurtjak
- Jožef Stefan Institute, Advanced Materials Department, Jamova cesta 39, Ljubljana, 1000, Slovenia.
- Jozef Stefan International Postgraduate School, Jamova cesta 39, Ljubljana, 1000, Slovenia.
| | - Marija Vukomanović
- Jožef Stefan Institute, Advanced Materials Department, Jamova cesta 39, Ljubljana, 1000, Slovenia
| | - Lovro Kramer
- Jozef Stefan International Postgraduate School, Jamova cesta 39, Ljubljana, 1000, Slovenia
- Jožef Stefan Institute, Department of Biochemistry and Molecular Biology, Jamova cesta 39, Ljubljana, 1000, Slovenia
| | - Danilo Suvorov
- Jožef Stefan Institute, Advanced Materials Department, Jamova cesta 39, Ljubljana, 1000, Slovenia
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164
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Zhang S, Chen S, Gao C, Jin Y, Jia G, Li Z, Liu D, Liang X, Yang X, Zhang J. Apoptosis induced by NaYF4:Eu3+ nanoparticles in liver cells via mitochondria damage dependent pathway. Sci China Chem 2016. [DOI: 10.1007/s11426-016-0225-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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165
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Kwok KWH, Dong W, Marinakos SM, Liu J, Chilkoti A, Wiesner MR, Chernick M, Hinton DE. Silver nanoparticle toxicity is related to coating materials and disruption of sodium concentration regulation. Nanotoxicology 2016; 10:1306-17. [DOI: 10.1080/17435390.2016.1206150] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Kevin W. H. Kwok
- Department of Applied Biology and Chemical Technology, the Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China,
| | - Wu Dong
- Nicholas School of the Environment and Center for the Environmental Implications of Nanotechnology, Duke University, Durham, NC, USA,
- College of Animal Science and Technology, Inner Mongolia University for Nationalities, Tong Liao, China,
| | | | - Jie Liu
- Department of Biomedical Engineering, and
| | - Ashutosh Chilkoti
- Department of Chemistry, Center for the Environmental Implications of Nanotechnology, Duke University, Durham, NC, USA
| | - Mark R. Wiesner
- Department of Chemistry, Center for the Environmental Implications of Nanotechnology, Duke University, Durham, NC, USA
| | - Melissa Chernick
- Nicholas School of the Environment and Center for the Environmental Implications of Nanotechnology, Duke University, Durham, NC, USA,
| | - David E. Hinton
- Nicholas School of the Environment and Center for the Environmental Implications of Nanotechnology, Duke University, Durham, NC, USA,
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166
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Blanco J, Lafuente D, Gómez M, García T, Domingo JL, Sánchez DJ. Polyvinyl pyrrolidone-coated silver nanoparticles in a human lung cancer cells: time- and dose-dependent influence over p53 and caspase-3 protein expression and epigenetic effects. Arch Toxicol 2016; 91:651-666. [PMID: 27387714 DOI: 10.1007/s00204-016-1773-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 06/20/2016] [Indexed: 12/11/2022]
Abstract
The present study was aimed at providing a better understanding of the influence of silver nanoparticles (AgNPs) on the p53 tumor suppressor protein. Cell line A549 was exposed to a range of concentrations of AgNPs, and a time course (up to 72 h) of cell viability was determined. We also determined the time course of gene and protein expression of p53, p21, murine double minute 2 (MDM2) and caspase-3. The expression of all of these proteins was also determined after daily exposure of the cells to 10 µg/mL of AgNPs for 7 days, or after discontinuous exposure by treating the cells every 3 days, for 15 or 30 days. Moreover, epigenetic changes in the acetylation of the histone H3 protein and in global DNA methylation patterns were determined after 72 h of exposure. Results showed that daily exposure to low doses of AgNPs, or a single exposure to high concentrations for 72 h, decreased gene and protein expression of p53, p21, MDM2 and caspase-3 in A549 cells. In contrast, a discontinuous exposure to low doses or a single exposure to low concentrations for 72 h increased the levels of the active forms of p53 and caspase-3, as well as the p21 and MDM2 protein levels. In addition, exposure to high concentrations of AgNPs for 72 h induced higher levels of global DNA methylation and global histone H3 deacetylation in A549 cells. These results provide new information on the toxic action of AgNPs.
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Affiliation(s)
- Jordi Blanco
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Universitat Rovira i Virgili, Sant Llorens 21, 43201, Reus, Catalonia, Spain
| | - Daisy Lafuente
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Universitat Rovira i Virgili, Sant Llorens 21, 43201, Reus, Catalonia, Spain
| | - Mercedes Gómez
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Universitat Rovira i Virgili, Sant Llorens 21, 43201, Reus, Catalonia, Spain
- Biochemistry Unit, School of Medicine, IISPV, Universitat Rovira i Virgili, Sant Llorens 21, 43201, Reus, Catalonia, Spain
| | - Tánia García
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Universitat Rovira i Virgili, Sant Llorens 21, 43201, Reus, Catalonia, Spain
- Biochemistry Unit, School of Medicine, IISPV, Universitat Rovira i Virgili, Sant Llorens 21, 43201, Reus, Catalonia, Spain
| | - José L Domingo
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Universitat Rovira i Virgili, Sant Llorens 21, 43201, Reus, Catalonia, Spain
| | - Domènec J Sánchez
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Universitat Rovira i Virgili, Sant Llorens 21, 43201, Reus, Catalonia, Spain.
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167
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Differential genotoxicity mechanisms of silver nanoparticles and silver ions. Arch Toxicol 2016; 91:509-519. [PMID: 27180073 DOI: 10.1007/s00204-016-1730-y] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 04/27/2016] [Indexed: 12/31/2022]
Abstract
In spite of many reports on the toxicity of silver nanoparticles (AgNPs), the mechanisms underlying the toxicity are far from clear. A key question is whether the observed toxicity comes from the silver ions (Ag+) released from the AgNPs or from the nanoparticles themselves. In this study, we explored the genotoxicity and the genotoxicity mechanisms of Ag+ and AgNPs. Human TK6 cells were treated with 5 nM AgNPs or silver nitrate (AgNO3) to evaluate their genotoxicity and induction of oxidative stress. AgNPs and AgNO3 induced cytotoxicity and genotoxicity in a similar range of concentrations (1.00-1.75 µg/ml) when evaluated using the micronucleus assay, and both induced oxidative stress by measuring the gene expression and reactive oxygen species in the treated cells. Addition of N-acetylcysteine (NAC, an Ag+ chelator) to the treatments significantly decreased genotoxicity of Ag+, but not AgNPs, while addition of Trolox (a free radical scavenger) to the treatment efficiently decreased the genotoxicity of both agents. In addition, the Ag+ released from the highest concentration of AgNPs used for the treatment was measured. Only 0.5 % of the AgNPs were ionized in the culture medium and the released silver ions were neither cytotoxic nor genotoxic at this concentration. Further analysis using electron spin resonance demonstrated that AgNPs produced hydroxyl radicals directly, while AgNO3 did not. These results indicated that although both AgNPs and Ag+ can cause genotoxicity via oxidative stress, the mechanisms are different, and the nanoparticles, but not the released ions, mainly contribute to the genotoxicity of AgNPs.
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168
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Gorbe M, Bhat R, Aznar E, Sancenón F, Marcos MD, Herraiz FJ, Prohens J, Venkataraman A, Martínez-Máñez R. Rapid Biosynthesis of Silver Nanoparticles Using Pepino (Solanum muricatum) Leaf Extract and Their Cytotoxicity on HeLa Cells. MATERIALS 2016; 9:ma9050325. [PMID: 28773448 PMCID: PMC5503040 DOI: 10.3390/ma9050325] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 04/21/2016] [Accepted: 04/25/2016] [Indexed: 11/16/2022]
Abstract
Within nanotechnology, gold and silver nanostructures have unique physical, chemical, and electronic properties [1,2], which make them suitable for a number of applications. Moreover, biosynthetic methods are considered to be a safer alternative to conventional physicochemical procedures for both the environmental and biomedical applications, due to their eco-friendly nature and the avoidance of toxic chemicals in the synthesis. For this reason, employing bio routes in the synthesis of functionalized silver nanoparticles (FAgNP) have gained importance recently in this field. In the present study, we report the rapid synthesis of FAgNP through the extract of pepino (Solanum muricatum) leaves and employing microwave oven irradiation. The core-shell globular morphology and characterization of the different shaped and sized FAgNP, with a core of 20-50 nm of diameter is established using the UV-Visible spectroscopy (UV-vis), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and Zeta potential and dynamic light scanning (DLS) studies. Moreover, cytotoxic studies employing HeLa (human cervix carcinoma) cells were undertaken to understand FAgNP interactions with cells. HeLa cells showed significant dose dependent antiproliferative activity in the presence of FAgNP at relatively low concentrations. The calculated IC50 value was 37.5 µg/mL, similar to others obtained for FAgNPs against HeLa cells.
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Affiliation(s)
- Mónica Gorbe
- Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, Valencia 46022, Spain.
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia 46022, Spain.
| | - Ravishankar Bhat
- Materials Chemistry Laboratory, Department of Chemistry, Gulbarga University, Gulbarga, Karnataka 585106, India.
- Biological Research Innovation Centre and Solutions LLP, Bengaluru, Karnataka 56004, India.
| | - Elena Aznar
- Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, Valencia 46022, Spain.
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia 46022, Spain.
| | - Félix Sancenón
- Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, Valencia 46022, Spain.
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia 46022, Spain.
- Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, Valencia 46022, Spain.
| | - M Dolores Marcos
- Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, Valencia 46022, Spain.
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia 46022, Spain.
- Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, Valencia 46022, Spain.
| | - F Javier Herraiz
- Instituto de Conservación y Mejora de la Agrodiversidad Valenciana, Universitat Politècnica de València, Camino de Vera 14, Valencia 46022, Spain.
| | - Jaime Prohens
- Instituto de Conservación y Mejora de la Agrodiversidad Valenciana, Universitat Politècnica de València, Camino de Vera 14, Valencia 46022, Spain.
| | - Abbaraju Venkataraman
- Materials Chemistry Laboratory, Department of Chemistry, Gulbarga University, Gulbarga, Karnataka 585106, India.
| | - Ramón Martínez-Máñez
- Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, Valencia 46022, Spain.
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valencia 46022, Spain.
- Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, Valencia 46022, Spain.
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169
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Kudaibergenov SE, Tatykhanova GS, Selenova BS. Polymer Protected and Gel Immobilized Gold and Silver Nanoparticles in Catalysis. J Inorg Organomet Polym Mater 2016. [DOI: 10.1007/s10904-016-0373-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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170
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Glinski A, Liebel S, Pelletier È, Voigt CL, Randi MAF, Campos SX, Oliveira Ribeiro CA, Filipak Neto F. Toxicological interactions of silver nanoparticles and organochlorine pesticides in mouse peritoneal macrophages. Toxicol Mech Methods 2016; 26:251-9. [DOI: 10.3109/15376516.2016.1159770] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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171
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172
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Chen C, Fan S, Li C, Chong Y, Tian X, Zheng J, Fu PP, Jiang X, Wamer WG, Yin JJ. Platinum nanoparticles inhibit antioxidant effects of vitamin C via ascorbate oxidase-mimetic activity. J Mater Chem B 2016; 4:7895-7901. [DOI: 10.1039/c6tb02382g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pt nanoparticles with ascorbate oxidase-mimetic activity inhibit the cytoprotective effect of vitamin C on cells challenged by H2O2.
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173
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Bhakya S, Muthukrishnan S, Sukumaran M, Grijalva M, Cumbal L, Franklin Benjamin JH, Senthil Kumar T, Rao MV. Antimicrobial, antioxidant and anticancer activity of biogenic silver nanoparticles – an experimental report. RSC Adv 2016. [DOI: 10.1039/c6ra17569d] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In the present study, use of a Helicteres isora stem bark extract for the biosynthesis of AgNPs is described.
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Affiliation(s)
- S. Bhakya
- P.G. & Research Department of Zoology
- Rajah Serfoji Govt. College (Autonomous)
- Thanjavur-613 005
- India
| | - S. Muthukrishnan
- Department of Plant Science
- Bharathidasan University
- Tiruchirappalli-620 024
- India
| | - M. Sukumaran
- P.G. & Research Department of Zoology
- Rajah Serfoji Govt. College (Autonomous)
- Thanjavur-613 005
- India
| | - M. Grijalva
- Centro de Nanociencia y Nanotecnología
- Universidad de las Fuerzas Armadas ESPE
- Sangolqui
- Ecuador
| | - L. Cumbal
- Centro de Nanociencia y Nanotecnología
- Universidad de las Fuerzas Armadas ESPE
- Sangolqui
- Ecuador
| | | | - T. Senthil Kumar
- Department of Industry University Collaboration
- Bharathidasan University
- Tiruchirappalli-620 024
- India
| | - M. V. Rao
- Department of Plant Science
- Bharathidasan University
- Tiruchirappalli-620 024
- India
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174
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Vale G, Mehennaoui K, Cambier S, Libralato G, Jomini S, Domingos RF. Manufactured nanoparticles in the aquatic environment-biochemical responses on freshwater organisms: A critical overview. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2016; 170:162-174. [PMID: 26655660 DOI: 10.1016/j.aquatox.2015.11.019] [Citation(s) in RCA: 121] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 11/16/2015] [Accepted: 11/19/2015] [Indexed: 05/02/2023]
Abstract
The enormous investments in nanotechnology have led to an exponential increase of new manufactured nano-enabled materials whose impact in the aquatic systems is still largely unknown. Ecotoxicity and nanosafety studies mostly resulted in contradictory results and generally failed to clearly identify biological patterns that could be related specifically to nanotoxicity. Generation of reactive oxygen species (ROS) is one of the most discussed nanotoxicity mechanism in literature. ROS can induce oxidative stress (OS), resulting in cyto- and genotoxicity. The ROS overproduction can trigger the induction of anti-oxidant enzymes such as catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidases (GPx), which are used as biomarkers of response. A critical overview of the biochemical responses induced by the presence of NPs on freshwater organisms is performed with a strong interest on indicators of ROS and general stress. A special focus will be given to the NPs transformations, including aggregation, and dissolution, in the exposure media and the produced biochemical endpoints.
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Affiliation(s)
- Gonçalo Vale
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Torre Sul Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Department of Molecular Genetics, University of Texas Southwestern Medical Center, Harry Dallas, TX 75390, USA.
| | - Kahina Mehennaoui
- Luxembourg Institute of Science and Technology, Environmental Research and Innovation (ERIN) Department, Belvaux, Luxembourg.
| | - Sebastien Cambier
- Luxembourg Institute of Science and Technology, Environmental Research and Innovation (ERIN) Department, Belvaux, Luxembourg.
| | - Giovanni Libralato
- Department of Environmental Sciences, Informatics and Statistics, University Ca' Foscari Venice, Via Torino 155, 30172, Mestre, Venice, Italy.
| | - Stéphane Jomini
- Laboratoire Interdisciplinaire des Environements Continentaux (LIEC), Université de Lorraine, UMR 7360, Campus Bridoux rue du Général Delestraint, 57070 Metz, France.
| | - Rute F Domingos
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Torre Sul Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Institut de Physique du Globe de Paris, Sorbonne Paris Cité, UMR CNRS 7154, Université Paris Diderot, 75205 Paris Cedex 05, France.
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175
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Shen X, Liu W, Gao X, Lu Z, Wu X, Gao X. Mechanisms of Oxidase and Superoxide Dismutation-like Activities of Gold, Silver, Platinum, and Palladium, and Their Alloys: A General Way to the Activation of Molecular Oxygen. J Am Chem Soc 2015; 137:15882-91. [DOI: 10.1021/jacs.5b10346] [Citation(s) in RCA: 283] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Xiaomei Shen
- College
of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
- CAS
Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety,
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Wenqi Liu
- CAS
Key Laboratory of Standardization and Measurement for Nanotechnology,
CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing 100190, China
| | - Xuejiao Gao
- CAS
Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety,
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Zhanghui Lu
- College
of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Xiaochun Wu
- CAS
Key Laboratory of Standardization and Measurement for Nanotechnology,
CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing 100190, China
| | - Xingfa Gao
- College
of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
- CAS
Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety,
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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176
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Hou X, Ma H, Liu F, Deng J, Ai Y, Zhao X, Mao D, Li D, Liao B. Synthesis of Ag ion-implanted TiO2 thin films for antibacterial application and photocatalytic performance. JOURNAL OF HAZARDOUS MATERIALS 2015; 299:59-66. [PMID: 26093355 DOI: 10.1016/j.jhazmat.2015.05.014] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 05/06/2015] [Accepted: 05/09/2015] [Indexed: 06/04/2023]
Abstract
TiO2 thin films were deposited by spin coating method. Silver ions were implanted into the films using a Metal Vapor Vacuum Arc implanter. The antibacterial ability of implanted films was tested using Escherichia coli removal under fluorescent irradiation and in the dark. The concentration of E. coli was evaluated by plating technique. The photocatalytic efficiency of the implanted films was studied by degradation of methyl orange under fluorescent illumination. The surface free energy of the implanted TiO2 films was calculated by contact angle testing. Vitamin C was used as radical scavengers to explore the antibacterial mechanism of the films. The results supported the model that both generation of reactive oxygen species and release of silver ions played critical roles in the toxic effect of implanted films against E. coli. XPS experimental results demonstrated that a portion of the Ag(Ag(3+)) ions were doped into the crystalline lattice of TiO2. As demonstrated by density functional theory calculations, the impurity energy level of subtitutional Ag was responsible for enhanced absorption of visible light. Ag ion-implanted TiO2 films with excellent antibacterial efficiency against bacteria and decomposed ability against organic pollutants could be potent bactericidal surface in moist environment.
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Affiliation(s)
- Xinggang Hou
- Department of Physics, Tianjin Normal University, Tianjin 300387, China.
| | - Huiyan Ma
- Department of Physics, Tianjin Normal University, Tianjin 300387, China
| | - Feng Liu
- Department of Physics, Tianjin Normal University, Tianjin 300387, China
| | - Jianhua Deng
- Department of Physics, Tianjin Normal University, Tianjin 300387, China
| | - Yukai Ai
- Department of Physics, Tianjin Normal University, Tianjin 300387, China
| | - Xinlei Zhao
- Department of Physics, Tianjin Normal University, Tianjin 300387, China
| | - Dong Mao
- Department of Physics, Tianjin Normal University, Tianjin 300387, China
| | - Dejun Li
- Department of Physics, Tianjin Normal University, Tianjin 300387, China
| | - Bin Liao
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, Beijing 100875, China
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177
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Liu Y, Wu H, Chong Y, Wamer WG, Xia Q, Cai L, Nie Z, Fu PP, Yin JJ. Platinum Nanoparticles: Efficient and Stable Catechol Oxidase Mimetics. ACS APPLIED MATERIALS & INTERFACES 2015; 7:19709-19717. [PMID: 26305170 DOI: 10.1021/acsami.5b05180] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Although enzyme-like nanomaterials have been extensively investigated over the past decade, most research has focused on the peroxidase-like, catalase-like, or SOD-like activity of these nanomaterials. Identifying nanomaterials having oxidase-like activities has received less attention. In this study, we demonstrate that platinum nanoparticles (Pt NPs) exhibit catechol oxidase-like activity, oxidizing polyphenols into the corresponding o-quinones. Four unique approaches are employed to demonstrate the catechol oxidase-like activity exerted by Pt NPs. First, UV-vis spectroscopy is used to monitor the oxidation of polyphenols catalyzed by Pt NPs. Second, the oxidized products of polyphenols are identified by ultrahigh-performance liquid chromatography (UHPLC) separation followed by high-resolution mass spectrometry (HRMS) identification. Third, electron spin resonance (ESR) oximetry techniques are used to confirm the O2 consumption during the oxidation reaction. Fourth, the intermediate products of semiquinone radicals formed during the oxidation of polyphenols are determined by ESR using spin stabilization. These results indicate Pt NPs possess catechol oxidase-like activity. Because polyphenols and related bioactive substances have been explored as potent antioxidants that could be useful for the prevention of cancer and cardiovascular diseases, and Pt NPs have been widely used in the chemical industry and medical science, it is essential to understand the potential effects of Pt NPs for altering or influencing the antioxidant activity of polyphenols.
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Affiliation(s)
- Yi Liu
- Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration , College Park, Maryland 20740, United States
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
| | - Haohao Wu
- Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration , College Park, Maryland 20740, United States
| | - Yu Chong
- Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration , College Park, Maryland 20740, United States
| | - Wayne G Wamer
- Division of Bioanalytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration , College Park, Maryland 20740, United States
| | - Qingsu Xia
- Biochemical Toxicology Division, National Center for Toxicological Research, U.S. Food and Drug Administration , Jefferson, Arkansas 72079, United States
| | - Lining Cai
- Biotranex LLC , Monmouth Junction, New Jersey 08852, United States
| | - Zhihong Nie
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
| | - Peter P Fu
- Biochemical Toxicology Division, National Center for Toxicological Research, U.S. Food and Drug Administration , Jefferson, Arkansas 72079, United States
| | - Jun-Jie Yin
- Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration , College Park, Maryland 20740, United States
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178
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Loo SL, Krantz WB, Hu X, Fane AG, Lim TT. Impact of solution chemistry on the properties and bactericidal activity of silver nanoparticles decorated on superabsorbent cryogels. J Colloid Interface Sci 2015; 461:104-113. [PMID: 26397916 DOI: 10.1016/j.jcis.2015.09.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 09/02/2015] [Accepted: 09/02/2015] [Indexed: 11/17/2022]
Abstract
This study investigated the effects of dissolved organic matter (DOM) and various electrolytes commonly found in environmental aqueous matrices on the physicochemical properties and bactericidal efficacy of silver nanoparticles (AgNPs), which are immobilized on cryogels (or PSA/AgNP cryogel). The AgNPs in the PSA/AgNP cryogel that were exposed to different media underwent morphological transformation in terms of particle size and structure. In addition, the presence of DOM and electrolytes increased the release of dissolved Ag. The biological uptake of Ag species (determined as the total Ag in exposed cells) increased in the presence of DOM, but decreased in the presence of electrolytes. The presence of electrolytes did not result in any significant reduction in the bactericidal activity. Although an initial increase of the DOM to 2.5 mg-C L(-1) attenuated the bactericidal efficacy of the immobilized AgNPs, an increase in the DOM concentration beyond 5 mg-C L(-1) enhanced the bactericidal efficacy. This study found that the bactericidal activity of the immobilized AgNPs is less sensitive to the solution chemistry relative to the free AgNPs. This suggests that immobilizing the AgNPs in a supporting material is a good strategy to preserve their efficacy for disinfection in various aqueous matrices.
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Affiliation(s)
- Siew-Leng Loo
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #05-05, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - William B Krantz
- School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, 50 Nanyang Avenue, Singapore 639798, Singapore; Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309-0424, USA
| | - Xiao Hu
- School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, 50 Nanyang Avenue, Singapore 639798, Singapore; School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Anthony G Fane
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #05-05, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, 50 Nanyang Avenue, Singapore 639798, Singapore.
| | - Teik-Thye Lim
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #05-05, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, 50 Nanyang Avenue, Singapore 639798, Singapore.
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179
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Oxidative Stress Mechanisms Caused by Ag Nanoparticles (NM300K) are Different from Those of AgNO3: Effects in the Soil Invertebrate Enchytraeus Crypticus. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2015; 12:9589-602. [PMID: 26287225 PMCID: PMC4555300 DOI: 10.3390/ijerph120809589] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 08/10/2015] [Indexed: 12/20/2022]
Abstract
The mechanisms of toxicity of Ag nanoparticles (NPs) are unclear, in particular in the terrestrial environment. In this study the effects of AgNP (AgNM300K) were assessed in terms of oxidative stress in the soil worm Enchytraeus crypticus, using a range of biochemical markers [catalase (CAT), glutathione peroxidase (GPx), glutathione S-transferase (GST), glutathione reductase (GR), total glutathione (TG), metallothionein (MT), lipid peroxidation (LPO)]. E. crypticus were exposed during 3 and 7 days (d) to the reproduction EC20, EC50 and EC80 levels of both AgNP and AgNO3. AgNO3 induced oxidative stress earlier (3 d) than AgNP (7 d), both leading to LPO despite the activation of the anti-redox system. MT increased only for AgNP. The Correspondence Analysis showed a clear separation between AgNO3 and AgNP, with e.g., CAT being the main descriptor for AgNP for 7 d. LPO, GST and GPx were for both 3 and 7 d associated with AgNO3, whereas MT and TG were associated with AgNP. These results may reflect a delay in the effects of AgNP compared to AgNO3 due to the slower release of Ag+ ions from the AgNP, although this does not fully explain the observed differences, i.e., we can conclude that there is a nanoparticle effect.
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180
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Espinosa JC, Navalón S, Álvaro M, García H. Silver Nanoparticles Supported on Diamond Nanoparticles as a Highly Efficient Photocatalyst for the Fenton Reaction under Natural Sunlight Irradiation. ChemCatChem 2015. [DOI: 10.1002/cctc.201500458] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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181
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He W, Jia H, Yang D, Xiao P, Fan X, Zheng Z, Kim HK, Wamer WG, Yin JJ. Composition Directed Generation of Reactive Oxygen Species in Irradiated Mixed Metal Sulfides Correlated with Their Photocatalytic Activities. ACS APPLIED MATERIALS & INTERFACES 2015; 7:16440-16449. [PMID: 26158231 DOI: 10.1021/acsami.5b03626] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The ability of nanostructures to facilitate the generation of reactive oxygen species and charge carriers underlies many of their chemical and biological activities. Elucidating which factors are essential and how these influence the production of various active intermediates is fundamental to understanding potential applications of these nanostructures, as well as potential risks. Using electron spin resonance spectroscopy coupled with spin trapping and spin labeling techniques, we assessed 3 mixed metal sulfides of varying compositions for their abilities to generate reactive oxygen species, photogenerate electrons, and consume oxygen during photoirradiation. We found these irradiated mixed metal sulfides exhibited composition dependent generation of ROS: ZnIn2S4 can generate (•)OH, O2(-•) and (1)O2; CdIn2S4 can produce O2(-•) and (1)O2, while AgInS2 only produces O2(-•). Our characterizations of the reactivity of the photogenerated electrons and consumption of dissolved oxygen, performed using spin labeling, showed the same trend in activity: ZnIn2S4 > CdIn2S4 > AgInS2. These intrinsic abilities to generate ROS and the reactivity of charge carriers correlated closely with the photocatalytic degradation and photoassisted antibacterial activities of these nanomaterials.
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Affiliation(s)
- Weiwei He
- †Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang, Henan 461000, P. R. China
- ‡Division of Bioanalytical Chemistry and Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, Maryland 20740, United States
| | - Huimin Jia
- †Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang, Henan 461000, P. R. China
| | - Dongfang Yang
- †Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang, Henan 461000, P. R. China
| | - Pin Xiao
- §School of Materials Science and Engineering, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Xiaoli Fan
- §School of Materials Science and Engineering, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Zhi Zheng
- †Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang, Henan 461000, P. R. China
| | - Hyun-Kyung Kim
- ∥Food Safety Bureau, Ministry of Food and Drug Safety, Osong Health Technology Administration Complex 363-700, Republic of Korea
| | - Wayne G Wamer
- ‡Division of Bioanalytical Chemistry and Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, Maryland 20740, United States
| | - Jun-Jie Yin
- ‡Division of Bioanalytical Chemistry and Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, Maryland 20740, United States
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182
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Zhang H, Wang X, Wang M, Li L, Chang CH, Ji Z, Xia T, Nel AE. Mammalian Cells Exhibit a Range of Sensitivities to Silver Nanoparticles that are Partially Explicable by Variations in Antioxidant Defense and Metallothionein Expression. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:3797-805. [PMID: 25930061 PMCID: PMC4537384 DOI: 10.1002/smll.201500251] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 03/16/2015] [Indexed: 05/29/2023]
Abstract
While it is well known that there are interspecies differences in Ag sensitivity, differences in the cytotoxic responses of mammalian cells to silver nanoparticles (Ag NPs) are also observed. In order to explore these response outcomes, six cell lines, including epithelial cells (Caco-2, NHBE, RLE-6TN, and BEAS-2B) and macrophages (RAW 264.7 and THP-1) of human and rodent origin, are exposed to 20 nm citrate- and PVP-coated Ag NPs with Au cores, as well as 20 nm citrate-coated particles without cores. An MTS assay shows that while Caco-2 and NHBE cells are resistant to particles over a 0.1-50 μg mL(-1) dose range, RAW 264.7, THP-1, RLE-6TN, and BEAS-2B cells are more susceptible. While there are small differences in dissolution rates, there are no major differences in the cytotoxic potential of the different particles. However, differences in anti-oxidant defense and metallothionein expression among different cell types are observed, which can partially explain differential Ag NP sensitivity. So, it is important to consider these differences in understanding the potential heterogeneous effects of nano Ag on mammalian biological systems.
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Affiliation(s)
- Haiyuan Zhang
- California NanoSystems Institute, University of California, Los Angeles, California, 90095, USA
| | - Xiang Wang
- California NanoSystems Institute, University of California, Los Angeles, California, 90095, USA
| | | | - Linjiang Li
- California NanoSystems Institute, University of California, Los Angeles, California, 90095, USA
| | - Chong Hyun Chang
- California NanoSystems Institute, University of California, Los Angeles, California, 90095, USA
| | - Zhaoxia Ji
- California NanoSystems Institute, University of California, Los Angeles, California, 90095, USA
| | - Tian Xia
- California NanoSystems Institute, University of California, Los Angeles, California, 90095, USA
| | - Andre E. Nel
- California NanoSystems Institute, University of California, Los Angeles, California, 90095, USA
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183
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Bhakya S, Muthukrishnan S, Sukumaran M, Muthukumar M. Biogenic synthesis of silver nanoparticles and their antioxidant and antibacterial activity. APPLIED NANOSCIENCE 2015. [DOI: 10.1007/s13204-015-0473-z] [Citation(s) in RCA: 151] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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184
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Perturbation of cellular mechanistic system by silver nanoparticle toxicity: Cytotoxic, genotoxic and epigenetic potentials. Adv Colloid Interface Sci 2015; 221:4-21. [PMID: 25935324 DOI: 10.1016/j.cis.2015.02.007] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 01/18/2015] [Accepted: 02/25/2015] [Indexed: 01/30/2023]
Abstract
Currently the applications of silver nanoparticles (Ag NPs) are gaining overwhelming response due to the advancement of nanotechnology. However, only limited information is available with regard to their toxicity mechanism in different species. It is very essential to understand the complete molecular mechanism to explore the functional and long term applications of Ag NPs. Ag NPs could be toxic at cellular, subcellular, biomolecular, and epigenetic levels. Toxicity effects induced by Ag NPs have been evaluated using numerous in vitro and in vivo models, but still there are contradictions in interpretations due to disparity in methodology, test endpoints and several other model parameters which needs to be considered. Thus, this review article focuses on the progressive elucidation of molecular mechanism of toxicity induced by Ag NPs in various in vitro and in vivo models. Apart from these, this review also highlights the various ignored factors which are to be considered during toxicity studies.
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185
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Wang L, Zhang T, Li P, Huang W, Tang J, Wang P, Liu J, Yuan Q, Bai R, Li B, Zhang K, Zhao Y, Chen C. Use of Synchrotron Radiation-Analytical Techniques To Reveal Chemical Origin of Silver-Nanoparticle Cytotoxicity. ACS NANO 2015; 9:6532-47. [PMID: 25994391 DOI: 10.1021/acsnano.5b02483] [Citation(s) in RCA: 168] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
To predict potential medical value or toxicity of nanoparticles (NPs), it is necessary to understand the chemical transformation during intracellular processes of NPs. However, it is a grand challenge to capture a high-resolution image of metallic NPs in a single cell and the chemical information on intracellular NPs. Here, by integrating synchrotron radiation-beam transmission X-ray microscopy (SR-TXM) and SR-X-ray absorption near edge structure (SR-XANES) spectroscopy, we successfully capture the 3D distribution of silver NPs (AgNPs) inside a single human monocyte (THP-1), associated with the chemical transformation of silver. The results reveal that the cytotoxicity of AgNPs is largely due to the chemical transformation of particulate silver from elemental silver (Ag(0))n, to Ag(+) ions and Ag-O-, then Ag-S- species. These results provide direct evidence in the long-lasting debate on whether the nanoscale or the ionic form dominates the cytotoxicity of silver nanoparticles. Further, the present approach provides an integrated strategy capable of exploring the chemical origins of cytotoxicity in metallic nanoparticles.
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Affiliation(s)
- Liming Wang
- †CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Tianlu Zhang
- †CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Panyun Li
- ‡Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Wanxia Huang
- ‡Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Jinglong Tang
- †CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Pengyang Wang
- †CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Jing Liu
- †CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Qingxi Yuan
- ‡Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Ru Bai
- †CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Bai Li
- †CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Kai Zhang
- ‡Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Yuliang Zhao
- †CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Chunying Chen
- †CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
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186
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Rai M, Ingle AP, Birla S, Yadav A, Santos CAD. Strategic role of selected noble metal nanoparticles in medicine. Crit Rev Microbiol 2015; 42:696-719. [DOI: 10.3109/1040841x.2015.1018131] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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187
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González AG, Mombo S, Leflaive J, Lamy A, Pokrovsky OS, Rols JL. Silver nanoparticles impact phototrophic biofilm communities to a considerably higher degree than ionic silver. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:8412-8424. [PMID: 25539705 DOI: 10.1007/s11356-014-3978-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Accepted: 12/10/2014] [Indexed: 06/04/2023]
Abstract
Due to the significant increase in nanoparticle production and especially that of silver nanoparticles over the past decade, the toxicity of silver in both ionic (Ag(+)) and nanoparticulate (AgNPs) form must be studied in detail in order to understand their impact on natural ecosystems. A comparative study of the effect of AgNPs and ionic silver on two independent phototrophic biofilms was conducted in a rotating annular bioreactor (RAB) operating under constant conditions. The concentration of dissolved silver in the inlet solution was progressively increased every 4 days of exposure, from 0.1 to 100 μg L(-1). In the course of the 40-day experiment, biofilm samples were collected to determine the evolution of biomass, chlorophyll-a, as well as photosynthetic and heterotrophic enzymatic activities in response to silver addition. Analysis of both dissolved and particulate silver allowed quantification of the distribution coefficient and uptake rate constants. The presence of both AgNPs and Ag(+) produced significant changes in the biofilm structure, decreasing the relative percentage of Diatomophyceae and Cyanophyceae and increasing the relative percentage of Chlorophyceae. The accumulation capacity of the phototrophic biofilm with respect to ionic silver and the corresponding distribution coefficients were an order of magnitude higher than those of the phototrophic biofilm with respect to AgNPs. Higher levels of AgNPs decreased the biomass from 8.6 ± 0.2 mg cm(-2) for 0-10 μg L(-1) AgNPs to 6.0 ± 0.1 mg cm(-2) for 100 μg L(-1) added AgNPs, whereas ionic silver did not have any toxic effect on the biofilm growth up to 100 μg L(-1) of added Ag(+). At the same time, AgNPs did not significantly affect the photosynthetic activity of the biofilm surface communities compared to Ag(+). It can thus be hypothesized that negatively charged AgNPs may travel through the biofilm water channels, thereby affecting the whole biofilm structure. In contrast, positively charged Ag(+) is bound at the cell surfaces and EPS, thus blocking its further flux within the biofilm layers. On the whole, the phototrophic biofilm demonstrated significant capacities to accumulate silver within the surface layers. The main mechanism to avoid the toxic effects is metal complexation with exopolysaccharides and accumulation within cell walls, especially pronounced under Ag(+) stress. The significant AgNPs and Ag(+) uptake capacities of phototrophic biofilm make it a highly resistant ecosystem in silver-polluted river waters.
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Affiliation(s)
- Aridane G González
- Université de Toulouse; UPS, INP; EcoLab (Laboratoire Écologie Fonctionnelle et Environnement), 118 route de Narbonne, 31062, Toulouse, France,
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188
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Wang Z, Xia T, Liu S. Mechanisms of nanosilver-induced toxicological effects: more attention should be paid to its sublethal effects. NANOSCALE 2015; 7:7470-81. [PMID: 25865054 PMCID: PMC4418973 DOI: 10.1039/c5nr01133g] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Due to its unique physicochemical properties and remarkable antimicrobial activity, nanosilver (nAg) is increasingly being used in a wide array of fields, including medicine and personal care products. Despite substantial progress being made towards the understanding of the acute toxicity of nAg, large knowledge gaps still exist on the assessment of its chronic toxicity to humans. Chronic effects of nAg, typically at low doses (i.e. sublethal doses) should be different from the acute toxicity at high doses (i.e., lethal doses), which is analogous to other environmental pollutants. Although a few review papers have elaborated the findings on nAg-mediated toxicity, most of them only discussed overt toxicity of nAg at high-level exposure and failed to evaluate the chronic and cumulative effects of nAg at sublethal doses. Therefore, it is necessary to more stringently scrutinize the sublethal toxicity of nAg under environmentally relevant conditions. Herein, we recapitulated recent findings on the sublethal effects of nAg toxicity performed by our groups and others. We then discussed the molecular mechanisms by which nAg exerts its toxicity under low concentrations and compared that with nAg-induced cell death.
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Affiliation(s)
- Zhe Wang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Department of Integrative Physiology and Pathobiology, Tufts University School of Medicine, Boston, Massachusetts 02111, USA
| | - Tian Xia
- Division of NanoMedicine, Department of Medicine, University of California, Los Angeles, California 90095, USA
| | - Sijin Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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189
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Mechanism of pH-switchable peroxidase and catalase-like activities of gold, silver, platinum and palladium. Biomaterials 2015; 48:37-44. [DOI: 10.1016/j.biomaterials.2015.01.012] [Citation(s) in RCA: 266] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 12/23/2014] [Accepted: 01/20/2015] [Indexed: 11/22/2022]
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190
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Loo SL, Krantz WB, Fane AG, Gao Y, Lim TT, Hu X. Bactericidal mechanisms revealed for rapid water disinfection by superabsorbent cryogels decorated with silver nanoparticles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:2310-8. [PMID: 25650519 DOI: 10.1021/es5048667] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The authors have recently reported the fabrication of superabsorbent cryogels decorated with silver nanoparticles (PSA/AgNP cryogels) that demonstrate rapid water disinfection. This paper provides a systematic elucidation of the bactericidal mechanisms of AgNPs (silver nanoparticles), both generally and in the specific context of cryogels. Direct contact between the PSA/AgNP cryogel interface and the bacterial cells is required to accomplish disinfection. Specifically, the disinfection efficacy is closely correlated to the cell-bound Ag concentration, which constitutes >90% of the Ag released. Cells exposed to PSA/AgNP cryogels show a significant depletion of intracellular adenosine triphosphate (ATP) content and cell-membrane lesions. A positive ROS (reactive oxygen species) scavenging test confirms the involvement of ROS (·O2(-), H2O2, and ·OH) in the bactericidal mechanism. Furthermore, exposed bacterial cells show an enhanced level of thiobarbituric acid reactive substances, indicating the occurrence of cell-membrane peroxidation mediated by ROS. In addition, this study reveals that both Ag(+) and Ag(0) are involved in the bactericidal mechanism of AgNPs via tests conducted using PSA cryogels with bound Ag(+) ions (or PSA/Ag(+) cryogels without reducing Ag(+) to Ag(0)). Significantly, bacterial cells exposed to PSA/Ag(+) cryogels did not show any cell-membrane damage even though the former had a higher cell-bound Ag concentration than that of the PSA/AgNP cryogels, thus indicating the differential action of Ag(+) and Ag(0).
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Affiliation(s)
- Siew-Leng Loo
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University , 1 Cleantech Loop, CleanTech One, #05-05, Singapore 637141, Singapore
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191
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Sussman EM, Casey BJ, Dutta D, Dair BJ. Different cytotoxicity responses to antimicrobial nanosilver coatings when comparing extract-based and direct-contact assays. J Appl Toxicol 2015; 35:631-9. [DOI: 10.1002/jat.3104] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 10/31/2014] [Accepted: 11/21/2014] [Indexed: 01/28/2023]
Affiliation(s)
- Eric M. Sussman
- Division of Biology, Chemistry and Materials Science, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health; US Food and Drug Administration; 10903 New Hampshire Ave. Silver Spring MD 20993 USA
| | - Brendan J. Casey
- Division of Biology, Chemistry and Materials Science, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health; US Food and Drug Administration; 10903 New Hampshire Ave. Silver Spring MD 20993 USA
| | - Debargh Dutta
- Division of Biology, Chemistry and Materials Science, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health; US Food and Drug Administration; 10903 New Hampshire Ave. Silver Spring MD 20993 USA
| | - Benita J. Dair
- Division of Biology, Chemistry and Materials Science, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health; US Food and Drug Administration; 10903 New Hampshire Ave. Silver Spring MD 20993 USA
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192
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Guo D, Zhang J, Huang Z, Jiang S, Gu N. Colloidal silver nanoparticles improve anti-leukemic drug efficacy via amplification of oxidative stress. Colloids Surf B Biointerfaces 2015; 126:198-203. [DOI: 10.1016/j.colsurfb.2014.12.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Revised: 12/11/2014] [Accepted: 12/12/2014] [Indexed: 10/24/2022]
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193
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Wang C, Shih Y. Degradation and detoxification of diazinon by sono-Fenton and sono-Fenton-like processes. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2014.11.005] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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194
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Wen T, He W, Chong Y, Liu Y, Yin JJ, Wu X. Exploring environment-dependent effects of Pd nanostructures on reactive oxygen species (ROS) using electron spin resonance (ESR) technique: implications for biomedical applications. Phys Chem Chem Phys 2015; 17:24937-43. [DOI: 10.1039/c5cp04046a] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pd nanostructures can promote the decomposition of H2O2 in a pH-dependent manner and scavenge superoxide and singlet oxygen.
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Affiliation(s)
- Tao Wen
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
- Division of Analytical Chemistry
- Office of Regulatory Science
| | - Weiwei He
- Division of Analytical Chemistry
- Office of Regulatory Science
- Center for Food Safety and Applied Nutrition
- US Food and Drug Administration
- College Park 20740, USA
| | - Yu Chong
- Division of Analytical Chemistry
- Office of Regulatory Science
- Center for Food Safety and Applied Nutrition
- US Food and Drug Administration
- College Park 20740, USA
| | - Yi Liu
- Division of Analytical Chemistry
- Office of Regulatory Science
- Center for Food Safety and Applied Nutrition
- US Food and Drug Administration
- College Park 20740, USA
| | - Jun-Jie Yin
- Division of Analytical Chemistry
- Office of Regulatory Science
- Center for Food Safety and Applied Nutrition
- US Food and Drug Administration
- College Park 20740, USA
| | - Xiaochun Wu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
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195
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Silver nanoparticles: their potential toxic effects after oral exposure and underlying mechanisms--a review. Food Chem Toxicol 2014; 77:58-63. [PMID: 25556118 DOI: 10.1016/j.fct.2014.12.019] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 12/19/2014] [Accepted: 12/23/2014] [Indexed: 11/20/2022]
Abstract
Because of their antimicrobial properties, the use of silver nanoparticles (AgNPs) is increasing fast in industry, food, and medicine. In the food industry, nanoparticles are used in packaging to enable better conservation products such as sensors to track their lifetime, and as food additives, such as anti-caking agents and clarifying agents for fruit juices. Nanoemulsions, used to encapsulate, protect and deliver additives are also actively developed. Nanomaterials in foods will be ingested and passed through the digestive tract. Those incorporated in food packaging may also be released unintentionally into food, ending up in the gastrointestinal tract. It is therefore important to make a risk assessment of nanomaterials to the consumer. Thus, exposure to AgNPs is increasing in quantity and it is imperative to know their adverse effects in man. However, controversies still remain with respect to their toxic effects and their mechanisms. Understanding the toxic effects and the interactions of AgNPs with biological systems is necessary to handle these nanoparticles and their use. They usually generate reactive oxygen species resulting in increased pro-inflammatory reactions and oxidative stress via intracellular signalling pathways. Here, we mainly focus on the routes of exposure of AgNPs, toxic effects and the mechanisms underlying the induced toxicity.
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196
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He Y, He X, Liu X, Gao L, Cui H. Dynamically Tunable Chemiluminescence of Luminol-Functionalized Silver Nanoparticles and Its Application to Protein Sensing Arrays. Anal Chem 2014; 86:12166-71. [DOI: 10.1021/ac503123q] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Yi He
- CAS
Key Laboratory of Soft Matter Chemistry, Collaborative Innovation
Center of Chemistry for Energy Materials, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
- School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
| | - Xiao He
- CAS
Key Laboratory of Soft Matter Chemistry, Collaborative Innovation
Center of Chemistry for Energy Materials, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Xiaoying Liu
- CAS
Key Laboratory of Soft Matter Chemistry, Collaborative Innovation
Center of Chemistry for Energy Materials, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Lingfeng Gao
- CAS
Key Laboratory of Soft Matter Chemistry, Collaborative Innovation
Center of Chemistry for Energy Materials, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Hua Cui
- CAS
Key Laboratory of Soft Matter Chemistry, Collaborative Innovation
Center of Chemistry for Energy Materials, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
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197
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Wang L, Zheng J, Li Y, Yang S, Liu C, Xiao Y, Li J, Cao Z, Yang R. AgNP-DNA@GQDs Hybrid: New Approach for Sensitive Detection of H2O2 and Glucose via Simultaneous AgNP Etching and DNA Cleavage. Anal Chem 2014; 86:12348-54. [DOI: 10.1021/ac503653c] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Lili Wang
- State Key Laboratory
of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical
Engineering, and Collaborative Innovation Center for Chemistry and
Molecular Medicine, Hunan University, Changsha 410082, P. R. China
| | - Jing Zheng
- State Key Laboratory
of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical
Engineering, and Collaborative Innovation Center for Chemistry and
Molecular Medicine, Hunan University, Changsha 410082, P. R. China
| | - Yinhui Li
- State Key Laboratory
of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical
Engineering, and Collaborative Innovation Center for Chemistry and
Molecular Medicine, Hunan University, Changsha 410082, P. R. China
| | - Sheng Yang
- State Key Laboratory
of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical
Engineering, and Collaborative Innovation Center for Chemistry and
Molecular Medicine, Hunan University, Changsha 410082, P. R. China
| | - Changhui Liu
- State Key Laboratory
of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical
Engineering, and Collaborative Innovation Center for Chemistry and
Molecular Medicine, Hunan University, Changsha 410082, P. R. China
| | - Yue Xiao
- State Key Laboratory
of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical
Engineering, and Collaborative Innovation Center for Chemistry and
Molecular Medicine, Hunan University, Changsha 410082, P. R. China
| | - Jishan Li
- State Key Laboratory
of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical
Engineering, and Collaborative Innovation Center for Chemistry and
Molecular Medicine, Hunan University, Changsha 410082, P. R. China
| | - Zhong Cao
- State Key Laboratory
of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical
Engineering, and Collaborative Innovation Center for Chemistry and
Molecular Medicine, Hunan University, Changsha 410082, P. R. China
- Hunan Provincial
Key Laboratory of Materials Protection for Electric Power and Transportation,
School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410004, P. R. China
| | - Ronghua Yang
- State Key Laboratory
of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical
Engineering, and Collaborative Innovation Center for Chemistry and
Molecular Medicine, Hunan University, Changsha 410082, P. R. China
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198
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Liu Y, Wu H, Li M, Yin JJ, Nie Z. pH dependent catalytic activities of platinum nanoparticles with respect to the decomposition of hydrogen peroxide and scavenging of superoxide and singlet oxygen. NANOSCALE 2014; 6:11904-11910. [PMID: 25175625 DOI: 10.1039/c4nr03848g] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Recently, platinum (Pt) nanoparticles (NPs) have received increasing attention in the field of catalysis and medicine due to their excellent catalytic activity. To rationally design Pt NPs for these applications, it is crucial to understand the mechanisms underlying their catalytic and biological activities. This article describes a systematic study on the Pt NP-catalyzed decomposition of hydrogen peroxide (H2O2) and scavenging of superoxide (O2˙(-)) and singlet oxygen ((1)O2) over a physiologically relevant pH range of 1.12-10.96. We demonstrated that the catalytic activities of Pt NPs can be modulated by the pH value of the environment. Our results suggest that Pt NPs possess peroxidase-like activity of decomposing H2O2 into ˙OH under acidic conditions, but catalase-like activity of producing H2O and O2 under neutral and alkaline conditions. In addition, Pt NPs exhibit significant superoxide dismutase-like activity of scavenging O2˙(-) under neutral conditions, but not under acidic conditions. The (1)O2 scavenging ability of Pt NPs increases with the increase in the pH of the environment. The study will provide useful guidance for designing Pt NPs with desired catalytic and biological properties.
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Affiliation(s)
- Yi Liu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
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199
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Peretyazhko TS, Zhang Q, Colvin VL. Size-controlled dissolution of silver nanoparticles at neutral and acidic pH conditions: kinetics and size changes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:11954-61. [PMID: 25265014 DOI: 10.1021/es5023202] [Citation(s) in RCA: 195] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Silver nanoparticles (Ag(NP)) are widely utilized in increasing number of medical and consumer products due to their antibacterial properties. Once released to aquatic system, Ag(NP) undergoes oxidative dissolution leading to production of toxic Ag(+). Dissolved Ag(+) can have a severe impact on various organisms, including indigenous microbial communities, fungi, alga, plants, vertebrates, invertebrates, and human cells. Therefore, it is important to investigate fate of Ag(NP) and determine physico-chemicals parameters that control Ag(NP) behavior in the natural environment. Nanoparticle size might have a dominant effect on Ag(NP) dissolution in natural waters. In this work, we investigated size-dependent dissolution of AgNP exposed to ultrapure deionized water (pH ≈ 7) and acetic acid (pH 3) and determined changes in nanoparticle size after dissolution. Silver nanoparticles stabilized by thiol functionalized methoxyl polyethylene glycol (PEGSH) of 6 nm (Ag(NP_)6), 9 nm (Ag(NP_)9), 13 nm (Ag(NP_)13), and 70 nm (Ag(NP_)70) were prepared. The results of dissolution experiments showed that the extent of AgNP dissolution in acetic acid was larger than in water. Solubility of Ag(NP) increased with the size decrease and followed the order Ag(NP_)6 > Ag(NP_)9 > Ag(NP_)13 > Ag(NP_)70 in both water and acetic acid. Transmission electron microscopy (TEM) was applied to characterize changes in size and morphology of the AgNP after dissolution in water. Analysis of Ag(NP) by TEM revealed that the particle morphology did not change during dissolution. The particles remained approximately spherical in shape, and no visible aggregation was observed in the samples. TEM analysis also demonstrated that Ag(NP_)6, Ag(NP_)9, and Ag(NP_)13 increased in size after dissolution likely due to Ostwald ripening.
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Affiliation(s)
- Tanya S Peretyazhko
- Department of Chemistry, Rice University , Houston, Texas 77005, United States
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200
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He W, Wu H, Wamer WG, Kim HK, Zheng J, Jia H, Zheng Z, Yin JJ. Unraveling the enhanced photocatalytic activity and phototoxicity of ZnO/metal hybrid nanostructures from generation of reactive oxygen species and charge carriers. ACS APPLIED MATERIALS & INTERFACES 2014; 6:15527-15535. [PMID: 25116236 DOI: 10.1021/am5043005] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
An effective way for promoting photocatalytic activity of a semiconductor is deposition of noble metal nanoparticles (NPs) onto it. In this paper, we deposited Ag and Pd onto ZnO NPs to form ZnO/Ag and ZnO/Pd hybrid nanostructures. It was found that both Ag and Pd nanocomponents can greatly enhance the photocatalytic activity and phototoxicity of ZnO toward human skin cells. Using electron spin resonance spectroscopy with spin trapping and spin labeling techniques, we observed that either deposition of Ag or Pd resulted in a significant increase in photogenerated electrons and holes and production of reactive oxygen species including hydroxyl radicals, superoxide, and singlet oxygen. We compared the enhancing effects of Ag and Pd and found that Pd is more effective than Ag in promoting the generation of hydroxyl radicals and holes and the photocatalytic activity of ZnO. Conversely, Ag is more effective than Pd in enhancing electron transfer and the generation of superoxide and singlet oxygen. The mechanism underlying the differences in the effects of Ag and Pd may be related to differences in Fermi levels for Ag and Pd and band bending accompanied by effects on Schottky barriers. The results of these studies provide information valuable for designing hybrid nanomaterials having photocatalytic and photobiological activities useful for applications such as water purification and formulation of antibacterial products.
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Affiliation(s)
- Weiwei He
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, Xuchang University , Xuchang, Henan 461000, P. R. China
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