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Sicard-Roselli C, Brun E, Gilles M, Baldacchino G, Kelsey C, McQuaid H, Polin C, Wardlow N, Currell F. A new mechanism for hydroxyl radical production in irradiated nanoparticle solutions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:3338-46. [PMID: 24863679 DOI: 10.1002/smll.201400110] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Revised: 03/12/2014] [Indexed: 05/20/2023]
Abstract
The absolute yield of hydroxyl radicals per unit of deposited X-ray energy is determined for the first time for irradiated aqueous solutions containing metal nanoparticles based on a "reference" protocol. Measurements are made as a function of dose rate and nanoparticle concentration. Possible mechanisms for hydroxyl radical production are considered in turn: energy deposition in the nanoparticles followed by its transport into the surrounding environment is unable to account for observed yield whereas energy deposition in the water followed by a catalytic-like reaction at the water-nanoparticle interface can account for the total yield and its dependence on dose rate and nanoparticle concentration. This finding is important because current models used to account for nanoparticle enhancement to radiobiological damage only consider the primary interaction with the nanoparticle, not with the surrounding media. Nothing about the new mechanism appears to be specific to gold, the main requirements being the formation of a structured water layer in the vicinity of the nanoparticle possibly through the interaction of its charge and the water dipoles. The massive hydroxyl radical production is relevant to a number of application fields, particularly nanomedicine since the hydroxyl radical is responsible for the majority of radiation-induced DNA damage.
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Affiliation(s)
- Cécile Sicard-Roselli
- Laboratoire de Chimie Physique CNRS UMR8000, Université Paris-Sud, 91405, Orsay Cedex, France
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202
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203
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La JA, Cho EC. Manipulation of Silver Nanocubes Detection Sensitivity to Radical Compounds by Modifying Their Surfaces with Anionic/Cationic Polyelectrolytes for Wide-Range Quantification of Radicals. Anal Chem 2014; 86:6675-82. [DOI: 10.1021/ac501430t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ju A La
- Department
of Chemical Engineering, Division of Chemical and Bioengineering, Hanyang University, Seoul 133-791, South Korea
| | - Eun Chul Cho
- Department
of Chemical Engineering, Division of Chemical and Bioengineering, Hanyang University, Seoul 133-791, South Korea
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204
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Mondal S, Verma S. Catalytic and SERS Activities of Tryptophan-EDTA Capped Silver Nanoparticles. Z Anorg Allg Chem 2014. [DOI: 10.1002/zaac.201400056] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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205
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Abstract
Silver nanoparticles (AgNPs) have been widely used in industrial, household, and healthcare-related products due to their excellent antimicrobial activity. With increased exposure of AgNPs to human beings, the risk of safety has attracted much attention from the public and scientists. In review of recent studies, we discuss the potential impact of AgNPs on individuals at the cell level. In detail, we highlight the main effects mediated by AgNPs on the cell, such as cell uptake and intracellular distribution, cytotoxicity, genotoxicity, and immunological responses, as well as some of the major factors that influence these effects in vitro and in vivo, such as dose, time, size, shape, surface chemistry, and cell type. At the end, we summarize the main influences on the cell and indicate the challenges in this field, which may be helpful for assessing the risk of AgNPs in future.
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Affiliation(s)
- Tianlu Zhang
- Laboratory of Plasma Physics & Materials, Beijing Institute of Graphic Communication, Beijing, China
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, National Center for Nanoscience and Technology, Beijing, China
| | - Liming Wang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, National Center for Nanoscience and Technology, Beijing, China
| | - Qiang Chen
- Laboratory of Plasma Physics & Materials, Beijing Institute of Graphic Communication, Beijing, China
| | - Chunying Chen
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, National Center for Nanoscience and Technology, Beijing, China
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206
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McShan D, Ray PC, Yu H. Molecular toxicity mechanism of nanosilver. J Food Drug Anal 2014; 22:116-127. [PMID: 24673909 PMCID: PMC4281024 DOI: 10.1016/j.jfda.2014.01.010] [Citation(s) in RCA: 424] [Impact Index Per Article: 42.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 12/27/2013] [Indexed: 12/12/2022] Open
Abstract
Silver is an ancient antibiotic that has found many new uses due to its unique properties on the nanoscale. Due to its presence in many consumer products, the toxicity of nanosilver has become a hot topic. This review summarizes recent advances, particularly the molecular mechanism of nanosilver toxicity. The surface of nanosilver can easily be oxidized by O2 and other molecules in the environmental and biological systems leading to the release of Ag+, a known toxic ion. Therefore, nanosilver toxicity is closely related to the release of Ag+. In fact, it is difficult to determine what portion of the toxicity is from the nano-form and what is from the ionic form. The surface oxidation rate is closely related to the nanosilver surface coating, coexisting molecules, especially thiol-containing compounds, lighting conditions, and the interaction of nanosilver with nucleic acids, lipid molecules, and proteins in a biological system. Nanosilver has been shown to penetrate the cell and become internalized. Thus, nanosilver often acts as a source of Ag+ inside the cell. One of the main mechanisms of toxicity is that it causes oxidative stress through the generation of reactive oxygen species and causes damage to cellular components including DNA damage, activation of antioxidant enzymes, depletion of antioxidant molecules (e.g., glutathione), binding and disabling of proteins, and damage to the cell membrane. Several major questions remain to be answered: (1) the toxic contribution from the ionic form versus the nano-form; (2) key enzymes and signaling pathways responsible for the toxicity; and (3) effect of coexisting molecules on the toxicity and its relationship to surface coating.
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Affiliation(s)
- Danielle McShan
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39217, USA
| | - Paresh C Ray
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39217, USA
| | - Hongtao Yu
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39217, USA.
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207
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He W, Liu Y, Wamer WG, Yin JJ. Electron spin resonance spectroscopy for the study of nanomaterial-mediated generation of reactive oxygen species. J Food Drug Anal 2014; 22:49-63. [PMID: 24673903 PMCID: PMC9359146 DOI: 10.1016/j.jfda.2014.01.004] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 12/20/2013] [Accepted: 12/21/2013] [Indexed: 12/18/2022] Open
Abstract
Many of the biological applications and effects of nanomaterials are attributed to their ability to facilitate the generation of reactive oxygen species (ROS). Electron spin resonance (ESR) spectroscopy is a direct and reliable method to identify and quantify free radicals in both chemical and biological environments. In this review, we discuss the use of ESR spectroscopy to study ROS generation mediated by nanomaterials, which have various applications in biological, chemical, and materials science. In addition to introducing the theory of ESR, we present some modifications of the method such as spin trapping and spin labeling, which ultimately aid in the detection of short-lived free radicals. The capability of metal nanoparticles in mediating ROS generation and the related mechanisms are also presented.
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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, China; Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD 20740, USA
| | - Yitong Liu
- Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD 20740, USA
| | - Wayne G Wamer
- Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD 20740, USA
| | - Jun-Jie Yin
- Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD 20740, USA.
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208
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Fu PP, Xia Q, Hwang HM, Ray PC, Yu H. Mechanisms of nanotoxicity: generation of reactive oxygen species. J Food Drug Anal 2014; 22:64-75. [PMID: 24673904 PMCID: PMC9359151 DOI: 10.1016/j.jfda.2014.01.005] [Citation(s) in RCA: 690] [Impact Index Per Article: 69.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 11/22/2013] [Accepted: 11/25/2013] [Indexed: 01/01/2023] Open
Abstract
Nanotechnology is a rapidly developing field in the 21st century, and the commercial use of nanomaterials for novel applications is increasing exponentially. To date, the scientific basis for the cytotoxicity and genotoxicity of most manufactured nanomaterials are not understood. The mechanisms underlying the toxicity of nanomaterials have recently been studied intensively. An important mechanism of nanotoxicity is the generation of reactive oxygen species (ROS). Overproduction of ROS can induce oxidative stress, resulting in cells failing to maintain normal physiological redox-regulated functions. This in turn leads to DNA damage, unregulated cell signaling, change in cell motility, cytotoxicity, apoptosis, and cancer initiation. There are critical determinants that can affect the generation of ROS. These critical determinants, discussed briefly here, include: size, shape, particle surface, surface positive charges, surface-containing groups, particle dissolution, metal ion release from nanometals and nanometal oxides, UV light activation, aggregation, mode of interaction with cells, inflammation, and pH of the medium.
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Affiliation(s)
- Peter P Fu
- National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR 72079, USA.
| | - Qingsu Xia
- National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR 72079, USA
| | - Huey-Min Hwang
- Department of Biology, Jackson State University, Jackson, MS 39217, USA
| | - Paresh C Ray
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39217, USA
| | - Hongtao Yu
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS 39217, USA
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209
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Stevanović M, Bračko I, Milenković M, Filipović N, Nunić J, Filipič M, Uskoković DP. Multifunctional PLGA particles containing poly(l-glutamic acid)-capped silver nanoparticles and ascorbic acid with simultaneous antioxidative and prolonged antimicrobial activity. Acta Biomater 2014; 10:151-62. [PMID: 23988864 DOI: 10.1016/j.actbio.2013.08.030] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Accepted: 08/20/2013] [Indexed: 12/21/2022]
Abstract
A water-soluble antioxidant (ascorbic acid, vitamin C) was encapsulated together with poly(l-glutamic acid)-capped silver nanoparticles (AgNpPGA) within a poly(lactide-co-glycolide) (PLGA) polymeric matrix and their synergistic effects were studied. The PLGA/AgNpPGA/ascorbic acid particles synthesized by a physicochemical method with solvent/non-solvent systems are spherical, have a mean diameter of 775 nm and a narrow size distribution with a polydispersity index of 0.158. The encapsulation efficiency of AgNpPGA/ascorbic acid within PLGA was determined to be >90%. The entire amount of encapsulated ascorbic acid was released in 68 days, and the entire amount of AgNpPGAs was released in 87 days of degradation. The influence of PLGA/AgNpPGA/ascorbic acid on cell viability, generation of reactive oxygen species (ROS) in HepG2 cells, as well as antimicrobial activity against seven different pathogens was investigated. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay indicated good biocompatibility of these PLGA/AgNpPGA/ascorbic acid particles. We measured the kinetics of ROS formation in HepG2 cells by a DCFH-DA assay, and found that PLGA/AgNpPGA/ascorbic acid caused a significant decrease in DCF fluorescence intensity, which was 2-fold lower than that in control cells after a 5h exposure. This indicates that the PLGA/AgNpPGA/ascorbic acid microspheres either act as scavengers of intracellular ROS and/or reduce their formation. Also, the results of antimicrobial activity of PLGA/AgNpPGA/ascorbic acid obtained by the broth microdilution method showed superior and extended activity of these particles. The samples were characterized using Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, zeta potential and particle size analysis. This paper presents a new approach to the treatment of infection that at the same time offers a very pronounced antioxidant effect.
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Affiliation(s)
- Magdalena Stevanović
- Centre for Fine Particles Processing and Nanotechnologies, Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Knez Mihailova 35/IV, 11000 Belgrade, Serbia.
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210
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Yang N, Liu Y, Ji Y, Ren Z, Meng J, Ji C, Liu J, Zheng J, Wu X, Zuo P, Xu H. Motor coordination dysfunction induced by gold nanorods core/silver shell nanostructures in mice: disruption in mitochondrial transport and neurotransmitter release. RSC Adv 2014. [DOI: 10.1039/c4ra13301c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The risk of exposure to silver nanoparticles (AgNPs) is becoming increasingly widespread and causes great concern.
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Affiliation(s)
- Nan Yang
- Department of Pharmacology
- Institute of Basic Medical Sciences
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100005, P. R. China
| | - Yanyong Liu
- Department of Pharmacology
- Institute of Basic Medical Sciences
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100005, P. R. China
| | - Yinglu Ji
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
| | - Zhili Ren
- Department of Pharmacology
- Institute of Basic Medical Sciences
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100005, P. R. China
| | - Jie Meng
- Department of Biomedical Engineering
- Institute of Basic Medical Sciences
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing, P. R. China
| | - Chao Ji
- Department of Pharmacology
- Institute of Basic Medical Sciences
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100005, P. R. China
| | - Jian Liu
- Department of Biomedical Engineering
- Institute of Basic Medical Sciences
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing, P. R. China
| | - Ji Zheng
- Department of Pharmacology
- Institute of Basic Medical Sciences
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100005, P. R. China
| | - Xiaochun Wu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
| | - Pingping Zuo
- Department of Pharmacology
- Institute of Basic Medical Sciences
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing 100005, P. R. China
| | - Haiyan Xu
- Department of Biomedical Engineering
- Institute of Basic Medical Sciences
- Chinese Academy of Medical Sciences & Peking Union Medical College
- Beijing, P. R. China
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211
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212
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Guo D, Zhu L, Huang Z, Zhou H, Ge Y, Ma W, Wu J, Zhang X, Zhou X, Zhang Y, Zhao Y, Gu N. Anti-leukemia activity of PVP-coated silver nanoparticles via generation of reactive oxygen species and release of silver ions. Biomaterials 2013; 34:7884-94. [DOI: 10.1016/j.biomaterials.2013.07.015] [Citation(s) in RCA: 208] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Accepted: 07/03/2013] [Indexed: 02/03/2023]
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213
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Zhou YT, He W, Lo YM, Hu X, Wu X, Yin JJ. Effect of silver nanomaterials on the activity of thiol-containing antioxidants. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:7855-7862. [PMID: 23889173 DOI: 10.1021/jf402146s] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The use of nanomaterials in consumer products is rapidly expanding. In most studies, nanomaterials are examined as isolated ingredients. However, consumer products such as foods, cosmetics, and dietary supplements are complex chemical matrixes. Therefore, interactions between nanomaterials and other components of the product must be investigated to ensure the product's performance and safety. Silver nanomaterials are increasingly being used in food packaging as antimicrobial agents. Thiol-containing compounds, such as reduced glutathione (GSH), cysteine, and dihydrolipoic acid, are used as antioxidants in many consumer products. In the current study, we have investigated the interaction between silver nanomaterials and thiol-containing antioxidants. The selected Ag nanomaterials were Ag coated with citrate, Ag coated with poly(vinylpyrrolidone), and Au nanorods coated with Ag in a core/shell structure. We observed direct quenching of the 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) by all three Ag nanomaterials to varying degrees. The Ag nanomaterials also reduced the quenching of DPPH by GSH to varying degrees. In addition, we determined that the mixture of GSH and Au@Ag nanorods held at 37 °C was less effective at quenching azo radical than at ambient temperature. Furthermore, we determined that Au@Ag nanorods significantly reduced the ability of GSH and cysteine to quench hydroxyl and superoxide radicals. The work presented here demonstrates the importance of examining the chemical interactions between nanomaterials used in products and physiologically important antioxidants.
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Affiliation(s)
- Yu-Ting Zhou
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration , College Park, Maryland 20740, United States
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214
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Raftery TD, Kerscher P, Hart AE, Saville SL, Qi B, Kitchens CL, Mefford OT, McNealy TL. Discrete nanoparticles induce loss of Legionella pneumophila biofilms from surfaces. Nanotoxicology 2013; 8:477-84. [PMID: 23586422 DOI: 10.3109/17435390.2013.796537] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Nanoparticles (NPs) have been shown to induce dispersal events in microbial biofilms but the mechanism of the dispersal is unknown. Biofilms contaminate many man-made aquatic systems such as cooling towers, spas and dental lines. Within these biofilms, Legionella pneumophila is a primary pathogen, leading to these environments serving as sources for disease outbreaks. Here we show a reduction in biofilm bio-volume upon treatment with citrate-coated 6-nm platinum NPs, polyethylene glycol (PEG)-coated 11-nm gold NPs, and PEG-coated 8-nm iron oxide NPs. Treatment with citrate-coated 8-nm silver NPs, however, did not reduce biomass. The synthesis of NPs that remain dispersed and resist irreversible aggregation in the exposure media appears to be a key factor in the ability of NPs to induce biofilm dispersal.
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Affiliation(s)
- Tara D Raftery
- Department of Biological Sciences, Institute of Environmental Toxicology (CU-ENTOX), Clemson University , 509 Westinghouse Road, Pendleton, SC , USA
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215
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Wang X, Zhang Y, Li T, Tian W, Zhang Q, Cheng Y. Generation 9 polyamidoamine dendrimer encapsulated platinum nanoparticle mimics catalase size, shape, and catalytic activity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5262-70. [PMID: 23544351 DOI: 10.1021/la3046077] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Poly(amidoamine) (PAMAM) encapsulated platinum nanoparticles were synthesized and used as catalase mimics. Acetylated generation 9 (Ac-G9) PAMAM dendrimer with a molecular size around 10 nm was used as a template to synthesize platinum nanoparticles. The feeding molar ratio of Pt(4+) and Ac-G9 is 2048, and the synthesized platinum nanoparticle (Ac-G9/Pt NP) has an average size of 3.3 nm. Ac-G9/Pt NP has a similar molecular size and globular shape with catalase (~11 nm). The catalytic activity of Ac-G9/Pt NP on the decomposition of H2O2 is approaching that of catalase at 37 °C. Ac-G9/Pt NP shows differential response to the changes of pH and temperature compared with catalase, which can be explained by different catalytic mechanisms of Ac-G9/Pt NP and catalase. Ac-G9/Pt NP also shows horseradish peroxidase activity and is able to scavenge free radicals such as di(phenyl)-(2,4,6-trinitrophenyl)iminoazanium (DPPH). Furthermore, Ac-G9/Pt NP shows excellent biocompatibility on different cell lines and can down-regulate H2O2-induced intracellular reactive oxygen species (ROS) in these cells. These results suggest that dendrimers are promising mimics of proteins with different sizes and Ac-G9/Pt NP can be used as an alternative candidate of catalase to decrease oxidation stress in cells.
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Affiliation(s)
- Xinyu Wang
- Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai 200062, People's Republic of China
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216
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Zhou YT, He W, Wamer WG, Hu X, Wu X, Lo YM, Yin JJ. Enzyme-mimetic effects of gold@platinum nanorods on the antioxidant activity of ascorbic acid. NANOSCALE 2013; 5:1583-1591. [PMID: 23329011 DOI: 10.1039/c2nr33072e] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Au@Pt nanorods were prepared by growing platinum nanodots on gold nanorods. Using electron spin resonance (ESR), we determined that the mechanisms for oxidation of ascorbic acid (AA) by Au@Pt nanorods and ascorbic acid oxidase (AAO) were kinetically similar and yielded similar products. In addition we observed that Au@Pt nanorods were stable with respect to temperature and pH. Using UV-VIS spectroscopy, the apparent kinetics of enzyme-mimetic activity of Au@Pt nanorods were studied and compared with the activity of AAO. With the help of ESR, we found that Au@Pt nanorods did not scavenge hydroxyl radicals but inhibited the antioxidant ability of AA for scavenging hydroxyl radicals produced by photoirradiating solutions containing titanium dioxide and zinc oxide. Moreover, the Au@Pt nanorods reduced the ability of AA to scavenge DPPH radicals and superoxide radicals. These results demonstrate that Au@Pt nanorods can reduce the antioxidant activity of AA. Therefore, it is necessary to consider the effects of using Pt nanoparticles together with other reducing agents or antioxidants such as AA due to the oxidase-like property of Au@Pt nanorods.
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Affiliation(s)
- Yu-Ting Zhou
- Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD 20740, USA
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217
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Nanosilver: application and novel aspects of toxicology. Arch Toxicol 2013; 87:569-76. [PMID: 23344422 DOI: 10.1007/s00204-012-1007-z] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Accepted: 12/20/2012] [Indexed: 01/19/2023]
Abstract
Nanomaterials are a challenge to toxicology. The high diversity of novel materials and products will require extensive expertize for evaluation and regulatory efforts. Nanomaterials are of substantial scientific and economic potential. Here, we will focus on nanosilver, a material not only with medical applications, but a rapidly increasing use in surprisingly many products. Consequently, toxicological evaluation has to cover an increasing range of complex topics. The toxicology of nanosilver is advancing rapidly; regulatory efforts by Federal Drug Agency and European Environment Protection Agencies are substantial. Current toxicological data, ranging from in vitro studies with cell lines to rodent experiments and ecological evaluation, are numerous, and many groups are providing continuously new data. However, standard classification based on nanosize only is neglecting nanoshape, which adds another level of complexity to the analysis of biological effects. A surprising neglect in nanosilver toxicology so far is the analysis of effects of nanosilver on amyloidosis. Amyloid diseases are widespread in humans and a severe health hazard. The known potential of silver to stimulate amyloidosis in rodents will require a timely and balanced evaluation of nanosilvers.
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218
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Cheng X, Zhang W, Ji Y, Meng J, Guo H, Liu J, Wu X, Xu H. Revealing silver cytotoxicity using Au nanorods/Ag shell nanostructures: disrupting cell membrane and causing apoptosis through oxidative damage. RSC Adv 2013. [DOI: 10.1039/c2ra23131j] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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219
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Chunyan W, Valiyaveettil S. Correlation of biocapping agents with cytotoxic effects of silver nanoparticles on human tumor cells. RSC Adv 2013. [DOI: 10.1039/c3ra41346b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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220
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Intrinsic catalytic activity of Au nanoparticles with respect to hydrogen peroxide decomposition and superoxide scavenging. Biomaterials 2013; 34:765-73. [DOI: 10.1016/j.biomaterials.2012.10.010] [Citation(s) in RCA: 253] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Accepted: 10/04/2012] [Indexed: 12/11/2022]
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