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Chang Y, Bai J, Yu H, Yang X, Chang PS, Nitin N. Synergistic inactivation of Listeria and E. coli using a combination of erythorbyl laurate and mild heating and its application in decontamination of peas as a model fresh produce. Food Microbiol 2022; 102:103869. [PMID: 34809926 DOI: 10.1016/j.fm.2021.103869] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 07/12/2021] [Accepted: 07/13/2021] [Indexed: 11/04/2022]
Abstract
We investigated the synergistic antimicrobial activity of erythorbyl laurate (EL) and mild heating co-treatment on the Gram-positive Listeria innocua and Gram-negative Escherichia coli O157:H7 bacteria. EL (2 mM) and mild heating (55 °C for 3 min) resulted in 3.1 and 0.5 log colony forming units (CFU)/mL reductions in the number of L. innocua, respectively, compared to a 6.4 log CFU/mL reduction induced by the combined treatment of EL and mild heating in saline. EL (10 mM) and mild heating (55 °C for 3 min) resulted in 1.3 and 0.7 log CFU/mL reductions in the number of E. coli O157:H7, respectively, compared to a 6.2 log CFU/mL reduction with the combined treatment in saline. EL, a membrane-active compound, showed a strong synergistic effect with mild heating, possibly due to enhanced disruption of the bacterial cell membrane. The synergistic antibacterial effect was evaluated using inoculated English peas (Pisum sativum) and this combined treatment (2 mM EL and mild heating against L. innocua and 10 mM EL and mild heating against E. coli O157:H7) resulted in more than 7 log reductions in the numbers of L. innocua and E. coli O157:H7, inoculated on the surface of fresh peas. The treatments did not show significant difference in the color or texture of treated peas compared to the non-treated controls. This is the first report illustrating synergistic activity of EL and mild heating for both the gram positive (L. innocua) and the gram negative (E. coli O157:H7) bacteria on food. Overall, this research will illustrate the development of more effective and rapid antibacterial surface disinfection method for application in the processing of minimally processed foods.
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Affiliation(s)
- Yoonjee Chang
- Department of Food and Nutrition, Kookmin University, Seoul, 02707, Republic of Korea; Department of Food Science and Technology, University of California, Davis, CA, USA
| | - Jaewoo Bai
- Department of Food Science and Technology, University of California, Davis, CA, USA; Division of Applied Food System, Major in Food Science & Technology, Seoul Women's University, Seoul, 01797, Republic of Korea
| | - Hyunjong Yu
- Department of Agricultural Biotechnology, Seoul National University, Seoul, 08826, Republic of Korea
| | - Xu Yang
- Department of Food Science and Technology, University of California, Davis, CA, USA
| | - Pahn-Shick Chang
- Department of Agricultural Biotechnology, Seoul National University, Seoul, 08826, Republic of Korea; Center for Food and Bioconvergence, Seoul National University, Seoul, 08826, Republic of Korea; Research Institute of Agriculture and Life Science, Seoul National University, Seoul, 08826, Republic of Korea.
| | - Nitin Nitin
- Department of Food Science and Technology, University of California, Davis, CA, USA; Department of Biological and Agricultural Engineering, University of California, Davis, CA, USA.
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Deng F, Wu P, Qian G, Shuai Y, Zhang L, Peng S, Shuai C, Wang G. Silver-decorated black phosphorus: a synergistic antibacterial strategy. NANOTECHNOLOGY 2022; 33:245708. [PMID: 35245907 DOI: 10.1088/1361-6528/ac5aee] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
Black phosphorus (BP) exhibits great potential as antibacterial materials due to its unique photocatalytic activity. However, the unsatisfactory optical absorption and quick recombination of photoinduced electron-hole pairs restrain its photocatalytic antibacterial performance. In this work, silver nanoparticles (AgNPs) were decorated on BP to construct BP@AgNPs nanohybrids and then introduced into poly-l-lactic acid scaffold. Combining the tunable bandgap of BP and the LSPR effect of AgNPs, BP@AgNPs nanohybrids displayed the broaden visible light absorption. Furthermore, AgNPs acted as electron acceptors could accelerate charge transfer and suppress electron-hole recombination. Therefore, BP@AgNPs nanohybrids achieved synergistically enhanced photocatalytic antibacterial activity under visible light irradiation. Fluorescence probe experiment verified that BP@AgNPs promoted the generation of reactive oxygen species, which could disrupt bacteria membrane, damage DNA and oxide proteins, and finally lead to bacteria apoptosis. As a result, the scaffold possessed strong antibacterial efficiency with a bactericidal rate of 97% under light irradiation. Moreover, the scaffold also exhibited good cytocompatibility. This work highlighted a new strategy to develop photocatalytic antibacterial scaffold for bone implant application.
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Affiliation(s)
- Fang Deng
- Institute of Bioadditive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, People's Republic of China
| | - Ping Wu
- Institute of Innovation and Applied Research in Chinese Medicine, Hunan University of Chinese Medicine, Changsha, Hunan 410208, People's Republic of China
| | - Guowen Qian
- Institute of Bioadditive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, People's Republic of China
| | - Yang Shuai
- College of Life Science and Technology, Huazhong University of Science and Technology, 430074, People's Republic of China
| | - Lemin Zhang
- Institute of Bioadditive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, People's Republic of China
| | - Shuping Peng
- NHC Key Laboratory of Carcinogenesis, School of Basic Medical Science, Central South University, Changsha, Hunan 410013, People's Republic of China
- School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330013, People's Republic of China
| | - Cijun Shuai
- Institute of Bioadditive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, People's Republic of China
- State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, People's Republic of China
| | - Guoyong Wang
- Institute of Bioadditive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, People's Republic of China
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Jee DY, Ha JW. Synergistic interaction of tap water-based neutral electrolyzed water combined with UVA irradiation to enhance microbial inactivation on stainless steel. Food Res Int 2021; 150:110773. [PMID: 34865788 DOI: 10.1016/j.foodres.2021.110773] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 10/01/2021] [Accepted: 10/18/2021] [Indexed: 11/25/2022]
Abstract
As an emerging electrolyzed water (EW) technology, tap water-based neutral electrolyzed water (TNEW) is an attractive alternative to other types of conventional EW for sterilization of food contact surfaces. In this study, we sought to identify strategies for improving TNEW inactivation efficiencies of major foodborne pathogenic bacteria. We investigated the synergistic antimicrobial effect of TNEW and ultraviolet-A light (UVA) combination treatment against Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes on stainless steel. The data confirmed that simultaneous TNEW and UVA treatment for 60 min reduced E. coli O157:H7, S. Typhimurium, and L. monocytogenes population by 2.15, 1.55, and 2.65 log CFU/cm2, respectively. The synergistic cell count reductions in E. coli O157:H7, S. Typhimurium, and L. monocytogenes in the combination treatment group were 1.17, 0.59, and 1.62 log units, respectively. Additionally, the mechanisms of the synergistic bactericidal effects of TNEW and UVA were identified through several approaches. Mechanistic investigations suggested that the synergistic effect was associated with intracellular reactive oxygen species generation, bacterial cell membrane damage, and inactivation of dehydrogenase. These findings demonstrate that treatment with TNEW and UVA light can enhance the microbiological safety of food contact surfaces during food processing.
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Affiliation(s)
- Da-Young Jee
- Department of Food Science and Biotechnology, Global K-Food Research Center, Hankyong National University, Anseong-si 17579, South Korea
| | - Jae-Won Ha
- Department of Food Science and Biotechnology, Global K-Food Research Center, Hankyong National University, Anseong-si 17579, South Korea.
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Chang Y, Bai J, Yu H, Chang PS, Nitin N. Synergistic Inactivation of Bacteria Using a Combination of Erythorbyl Laurate and UV Type-A Light Treatment. Front Microbiol 2021; 12:682900. [PMID: 34335506 PMCID: PMC8322444 DOI: 10.3389/fmicb.2021.682900] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 06/25/2021] [Indexed: 11/13/2022] Open
Abstract
This study evaluated the synergistic antimicrobial activity of erythorbyl laurate (EL) and UV type-A (UVA). To investigate the mode of synergism, changes in gene expression and bacterial inactivation activity were examined. Individual treatments with EL (10 mM) or UVA caused a 1.9- or 0.5-log CFU/ml reduction respectively, whereas EL/UVA co-treatment resulted in a 5.5-log CFU/ml reduction in Escherichia coli viable cell numbers. Similarly, treatment with either EL (2 mM) or UVA for 30 min resulted in a 2.8- or 0.1-log CFU/ml reduction in Listeria innocua, respectively, whereas combined treatment with both EL and UVA resulted in a 5.4-log CFU/ml reduction. Measurements of gene expression levels showed that EL and UVA treatment synergistically altered the gene expression of genes related to bacterial membrane synthesis/stress response. However, addition of 10–50-fold excess concentration of exogenous antioxidant compared to EL reduced the synergistic effect of EL and UVA by approximately 1 log. In summary, the results illustrate that synergistic combination of EL and UVA enhanced membrane damage independent of the oxidative stress damage induced by UVA and thus illustrate a novel photo-activated synergistic antimicrobial approach for the inactivation of both the Gram-positive and Gram-negative bacteria. Overall, this study illustrates mechanistic evaluation of a novel photochemical approach for food and environmental applications.
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Affiliation(s)
- Yoonjee Chang
- Department of Food and Nutrition, Kookmin University, Seoul, South Korea.,Department of Food Science and Technology, University of California, Davis, Davis, CA, United States
| | - Jaewoo Bai
- Department of Food Science and Technology, University of California, Davis, Davis, CA, United States.,Division of Applied Food System, Major in Food Science & Technology, Seoul Women's University, Seoul, South Korea
| | - Hyunjong Yu
- Department of Agricultural Biotechnology, Seoul National University, Seoul, South Korea
| | - Pahn-Shick Chang
- Department of Agricultural Biotechnology, Seoul National University, Seoul, South Korea.,Center for Food and Bioconvergence, Seoul National University, Seoul, South Korea.,Research Institute of Agriculture and Life Science, Seoul National University, Seoul, South Korea
| | - Nitin Nitin
- Department of Food Science and Technology, University of California, Davis, Davis, CA, United States.,Department of Biological and Agricultural Engineering, University of California, Davis, Davis, CA, United States
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Souza IR, Silva LR, Fernandes LSP, Salgado LD, Silva de Assis HC, Firak DS, Bach L, Santos-Filho R, Voigt CL, Barros AC, Peralta-Zamora P, Mattoso N, Franco CRC, Soares Medeiros LC, Marcon BH, Cestari MM, Sant'Anna-Santos BF, Leme DM. Visible-light reduced silver nanoparticles' toxicity in Allium cepa test system. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 257:113551. [PMID: 31801672 DOI: 10.1016/j.envpol.2019.113551] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 09/28/2019] [Accepted: 10/31/2019] [Indexed: 06/10/2023]
Abstract
Silver nanoparticles (AgNPs) are widely used in consumer products due to their antibacterial property; however, their potential toxicity and release into the environment raises concern. Based on the limited understanding of AgNPs aggregation behavior, this study aimed to investigate the toxicity of uncoated (uc-AgNP) and coated with polyvinylpyrrolidone (PVP-AgNP), at low concentrations (0.5-100 ng/mL), under dark and visible-light exposure, using a plant test system. We exposed Allium cepa seeds to both types of AgNPs for 4-5 days to evaluate several toxicity endpoints. AgNPs did not cause acute toxicity (i.e., inhibition of seed germination and root development), but caused genotoxicity and biochemical alterations in oxidative stress parameters (lipid peroxidation) and activities of antioxidant enzymes (superoxide dismutase and catalase) in light and dark conditions. However, the light exposure decreased the rate of chromosomal aberration and micronuclei up to 5.60x in uc-AgNP and 2.01x in PVP-AgNP, and 2.69x in uc-AgNP and 3.70x in PVP-AgNP, respectively. Thus, light exposure reduced the overall genotoxicity of these AgNPs. In addition, mitotic index alterations and morphoanatomical changes in meristematic cells were observed only in the dark condition at the highest concentrations, demonstrating that light also reduces AgNPs cytotoxicity. The light-dependent aggregation of AgNPs may have reduced toxicity by reducing the uptake of these NPs by the cells. Our findings demonstrate that AgNPs can be genotoxic, cytotoxic and induce morphoanatomical and biochemical changes in A. cepa roots even at low concentrations, and that visible-light alters their aggregation state, and decreases their toxicity. We suggest that visible light can be an alternative treatment to remediate AgNP residues, minimizing their toxicity and environmental risks.
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Affiliation(s)
- Irisdoris R Souza
- Department of Genetics, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | - Lucas R Silva
- Department of Genetics, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | - Letícia S P Fernandes
- Department of Pharmacology, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | - Lilian D Salgado
- Department of Pharmacology, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | | | - Daniele S Firak
- Department of Chemistry, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | - Larissa Bach
- Department of Chemistry, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | - Ronaldo Santos-Filho
- Department of Genetics, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | - Carmen L Voigt
- Department of Chemistry, State University of Ponta Grossa, Ponta Grossa, PR, Brazil
| | - Ariana C Barros
- Department of Botany, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | | | - Ney Mattoso
- Department of Physics, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | - Celia Regina C Franco
- Department of Cellular and Molecular Biology, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | | | | | - Marta M Cestari
- Department of Genetics, Federal University of Paraná (UFPR), Curitiba, PR, Brazil
| | | | - Daniela M Leme
- Department of Genetics, Federal University of Paraná (UFPR), Curitiba, PR, Brazil; National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, Araraquara, SP, Brazil.
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6
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Zare T, Fardid R, Naderi S. Synergetic Effect of Silver Nanoparticles and UVC Irradiation on H2AX Gene Expression in TK6 Cells. CELL JOURNAL 2019; 21:204-209. [PMID: 30825294 PMCID: PMC6397600 DOI: 10.22074/cellj.2019.5898] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 06/24/2018] [Indexed: 11/04/2022]
Abstract
OBJECTIVE The use of nanoscale particles, for instance silver nanoparticles (Ag NPs) has considerably increased recently. Since Ag NPs can be transmuted into silver ions; the toxicity and genotoxicity of these NPs along with other external factors such as ultraviolet type C (UVC) irradiation must be evaluated. In the present study, the aim was to investigate the genotoxic effects Ag NPs and UVC co-exposure on human lymphoblastoid TK6 cells. MATERIALS AND METHODS In this experimental study, Ag NPs (~20 nm) were purchased from US Research Nanomaterials Inc. and H2AX gene expression was evaluated using quantitative real time polymerase chain reaction (qRT-PCR), 1 and 24 hours post Ag NPs and UVC treatment. RESULTS Results showed that treatment of TK6 cells with different Ag NP concentrations without exposure to UVC can reduce H2AX gene expression, but treatment of these cells with Ag NPs in combination UVC irradiation can reduce viability that leads to a synergistic increase in the amount of H2AX gene expression. CONCLUSION According to our findings, Ag NPs can act to sensitize cells to UVC radiation when used for cancer treatment. So, combination of Ag NPs and UVC irradiation could be used in radiotherapy.
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Affiliation(s)
- Tahereh Zare
- Department of Radiology, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Reza Fardid
- Department of Radiology, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran. electronic address:
- Ionizing and Non-Ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz, Iran
| | - Samaneh Naderi
- Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
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Singh SP, Sirbaiya AK, Mishra A. Bioinspired Smart Nanosystems in Advanced Therapeutic Applications. Pharm Nanotechnol 2019; 7:246-256. [PMID: 31020941 DOI: 10.2174/2211738507666190425122822] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 12/03/2018] [Accepted: 04/10/2019] [Indexed: 01/16/2023]
Abstract
BACKGROUND Nanoparticle technologies used for human administration must be designed to interact with a living host environment. The idea about bioinspired smart drug delivery carriers includes the development of biocompatible nanomaterials which can be further loaded with the drug for specific targeted drug delivery applications. OBJECTIVE Biosmart nanosystems are used for several applications in the delivery of drugs and pharmaceuticals for their therapeutic applications like biological markers, diagnostic purposes such as imaging applications and also for gene therapy. Thus, the bioinspired nanocarriers are capable of carrying biologically active molecules to the target sites. This bioinspired nanosystem constitutes of lipids, polymers and biomaterials which utilizes various responsive sensors for targeted drug delivery systems. However, external conditions such as heat, light, magnetic or electric field and ultrasounds, along with temperature, altered pH and ionic strength can affect the bioinspired smart nanosystem for drug delivery. CONCLUSION The present review focuses on challenges for the development of bioinspired smart nanocarriers for the management of various disorders.
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Affiliation(s)
- Satya Prakash Singh
- Department of Pharmaceutics, Faculty of Pharmacy, Integral University, Lucknow-226026, U.P, India
| | - Anup Kumar Sirbaiya
- Department of Pharmaceutics, Faculty of Pharmacy, Integral University, Lucknow-226026, U.P, India
| | - Anuradha Mishra
- Department of Pharmaceutics, Faculty of Pharmacy, Integral University, Lucknow-226026, U.P, India
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Silver Nanoparticle-Induced Phosphorylation of Histone H3 at Serine 10 Involves MAPK Pathways. Biomolecules 2019; 9:biom9020078. [PMID: 30813344 PMCID: PMC6406294 DOI: 10.3390/biom9020078] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 02/15/2019] [Accepted: 02/18/2019] [Indexed: 01/21/2023] Open
Abstract
The phosphorylation of histone H3 at serine 10 (p-H3S10) has been shown to be closely correlated with mitotic chromosome condensation. We previously reported that intracellular silver nanoparticles (AgNPs) release Ag ions that alter actin filament dynamics, leading to the activation of Aurora kinases and the formation of p-H3S10 through a mechanism clearly different from that occurring during mitosis. In the present study, we examined other mechanisms underlying the induction of p-H3S10 formation by AgNPs. We observed that the early formation of p-H3S10 induced by AgNPs occurred via the activation of mitogen-activated protein kinase (MAPK) pathways, specifically the Jun N-terminal protein kinase (JNK) and extracellular signal-regulated kinase (ERK) pathways. The late AgNP-induced p-H3S10 formation occurred via the activation of the entire MAPK cascade. On the other hand, p-H3S10 formation was not due to DNA damage induced by AgNPs, or the activation of the kinases ataxia telangiectasia-mutated (ATM) and ATM-Rad3-related (ATR). Several studies have compared the mechanism of AgNP toxicity to a Trojan horse-type molecular pathway. We observed different effects of AgNO3 (Ag+) and AgNPs on cells, and only the JNK inhibitor suppressed the temporary AgNO3-induced formation of p-H3S10. These results strongly indicate that AgNP-induced p-H3S10 formation does not rely solely on one signaling pathway, but rather may involve two or more pathways.
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Li Y, Zhao J, Shang E, Xia X, Niu J, Crittenden J. Effects of Chloride Ions on Dissolution, ROS Generation, and Toxicity of Silver Nanoparticles under UV Irradiation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:4842-4849. [PMID: 29260863 DOI: 10.1021/acs.est.7b04547] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This work investigates the effect of chloride ion (Cl-) on dissolution, reactive oxygen species (ROS) generation, and toxicity of citrate-coated silver nanoparticles (AgNPs) under UV irradiation. The dissolution rate was decreased by 0.01 M Cl- due to AgCl passivation on the AgNP surface. By contrast, high concentrations of Cl- (0.1 or 0.5 M) promoted dissolution due to the formation of soluble Ag-Cl complexes (AgCl x1- x). The generation of O2•- in the AgNPs/Cl-/UV system was promoted by 0.01 M Cl-, whereas it was retarded by 0.1 or 0.5 M Cl-, which was probably because the aggregation of AgNPs at high ionic strength reduced the nanoparticles' surface areas for radical formation. Additionally, Cl- contributed to •OH generation in the AgNPs/Cl-/UV system, in which the produced •OH concentrations increased with increasing Cl- concentrations. The reduction reaction between silver ions and O2•- resulted in lower dissolution rates of AgNPs/Cl- mixtures under UV irradiation than those in the dark. The phototoxicity of AgNPs toward E. coli with different concentrations of Cl- followed the order of 0.5 M > 0 M > 0.1 M > 0.01 M. Both ROS and dissolved Ag played significant role in the phototoxicity of AgNPs. This work demonstrates the potential importance of anions in the fate and biological impact of AgNPs.
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Affiliation(s)
- Yang Li
- State Key Laboratory of Water Environment Simulation, School of Environment , Beijing Normal University , Beijing 100875 , People's Republic of China
| | - Jian Zhao
- State Key Laboratory of Water Environment Simulation, School of Environment , Beijing Normal University , Beijing 100875 , People's Republic of China
| | - Enxiang Shang
- State Key Laboratory of Water Environment Simulation, School of Environment , Beijing Normal University , Beijing 100875 , People's Republic of China
| | - Xinghui Xia
- State Key Laboratory of Water Environment Simulation, School of Environment , Beijing Normal University , Beijing 100875 , People's Republic of China
| | - Junfeng Niu
- School of Environment and Civil Engineering , Dongguan University of Technology , Dongguan 523808 , People's Republic of China
| | - John Crittenden
- School of Civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
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Graphene oxide nanoribbons as nanomaterial for bone regeneration: Effects on cytotoxicity, gene expression and bactericidal effect. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 78:341-348. [DOI: 10.1016/j.msec.2017.03.278] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 01/28/2017] [Accepted: 03/28/2017] [Indexed: 11/18/2022]
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11
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Zhao X, Toyooka T, Ibuki Y. Silver nanoparticle-induced phosphorylation of histone H3 at serine 10 is due to dynamic changes in actin filaments and the activation of Aurora kinases. Toxicol Lett 2017; 276:39-47. [PMID: 28499611 DOI: 10.1016/j.toxlet.2017.05.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 04/08/2017] [Accepted: 05/05/2017] [Indexed: 12/25/2022]
Abstract
The phosphorylation of histone H3 at serine 10 (p-H3S10) has been closely correlated with mitotic chromosome condensation. We previously reported that silver nanoparticles (AgNPs) significantly induced p-H3S10 independent of mitosis. In the present study, we examined the mechanisms underlying the induction of p-H3S10 by AgNPs. A treatment with AgNPs markedly induced p-H3S10 in a dose-dependent manner in three types of cell lines, and this was dependent on the cellular incorporation of AgNPs. The immunofluorescent staining of AgNP-induced p-H3S10 was thin and solid throughout the nucleus, and differed from that normally associated with mitosis. AgNPs induced the formation of globular actin in a dose-dependent manner. Latrunculin B (LatB) and phalloidin, inhibitors of actin polymerization and depolymerization, respectively, inhibited p-H3S10, suggesting that dynamic changes in actin filaments are related to AgNP-induced p-H3S10. Furthermore, p-H3S10 was mediated by Aurora kinase (AURK) pathways, which were suppressed by LatB and siRNA for cofilin 1, an actin-depolymerizing protein. AgNO3 (Ag ions) exerted similar effects to those of AgNPs. These results suggest that Ag ions released from AgNPs incorporated into inner cells changed the dynamics of actin filaments, and this was followed by the activation of AURKs, leading to the induction of p-H3S10.
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Affiliation(s)
- Xiaoxu Zhao
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan
| | - Tatsushi Toyooka
- Industrial Toxicology and Health Effects Research Group, National Institute of Occupational Safety and Health, Japan
| | - Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan.
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12
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Shang E, Niu J, Li Y, Zhou Y, Crittenden JC. Comparative toxicity of Cd, Mo, and W sulphide nanomaterials toward E. coli under UV irradiation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 224:606-614. [PMID: 28258860 DOI: 10.1016/j.envpol.2017.02.044] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 01/20/2017] [Accepted: 02/12/2017] [Indexed: 05/07/2023]
Abstract
In this study, the phototoxicity of cadmium sulfide (CdS), molybdenum disulfide (MoS2), and tungsten disulfide (WS2) nanoparticles (NPs) toward Escherichia coli (E. coli) under UV irradiation (365 nm) was investigated. At the same mass concentration of NPs, the toxicity of three NPs decreased in the order of CdS > MoS2 > WS2. For example, the death rates of E. coli exposed to 50 mg/L CdS, MoS2, and WS2 were 96.7%, 38.5%, and 31.2%, respectively. Transmission electron microscope and laser scanning confocal microscope images of E. coli exposed to three NPs showed the damage of cell walls and release of intracellular components. The CdS-treated cell wall was more extensively damaged than those of MoS2-treated and WS2-treated bacteria. WS2 and MoS2 generated superoxide radical (O2-), singlet oxygen (1O2), and hydroxyl radical under UV irradiation, CdS produced only O2- and 1O2. CdS and WS2 released ions under UV irradiation, while MoS2 did not. Reactive oxygen species (ROS) generation and toxic ion release jointly resulted in the antibacterial activities of CdS and WS2. ROS generation was the dominant toxic mechanism of MoS2 toward the bacteria. This study highlighted the importance of considering the hazardous effect of sulfide NPs after their release into natural waters under light irradiation condition.
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Affiliation(s)
- Enxiang Shang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Junfeng Niu
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
| | - Yang Li
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
| | - Yijing Zhou
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - John Charles Crittenden
- School of Civil and Environmental Engineering and the Brook Byers Institutue for Sustainable Systems, Georgia Institute of Technology, Atlanta, 30332, Georgia
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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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14
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Domínguez-Espíndola RB, Varia JC, Álvarez-Gallegos A, Ortiz-Hernández ML, Peña-Camacho JL, Silva-Martínez S. Photoelectrocatalytic inactivation of fecal coliform bacteria in urban wastewater using nanoparticulated films of TiO 2 and TiO 2/Ag. ENVIRONMENTAL TECHNOLOGY 2017; 38:606-614. [PMID: 27384128 DOI: 10.1080/09593330.2016.1205148] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Photocatalysis has shown the ability to inactivate a wide range of harmful microorganisms with traditional use of chlorination. Photocatalysis combined with applied bias potential (photoelectrocatalysis) increases the efficiency of photocatalysis and decreases the charge recombination. This work examines the inactivation of fecal coliform bacteria present in real urban wastewater by photoelectrocatalysis using nanoparticulated films of TiO2 and TiO2/Ag (4%w/w) under UV light irradiation. The catalysts were prepared with different thicknesses by the sol-gel method and calcined at 400°C and 600°C. The urban wastewater samples were collected from the sedimentation tank effluent of the university sewage treatment facility. The rate of bacteria inactivation increases with increasing the applied potential and film thicknesses; also, the presence of silver on the catalyst surface annealed at 400°C shows better inactivation than that at 600°C. Finally, a structural cell damage of Escherichia coli (DH5α), inoculated in water, is observed during the photoelectrocatalytic process.
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Affiliation(s)
| | - Jeet C Varia
- b School of Biosciences , Birmingham University , Birmingham , UK
| | - Alberto Álvarez-Gallegos
- c Centro de Investigaciones en Ingeniería y Ciencias Aplicadas , Universidad Autónoma del Estado de Morelos , Cuernavaca , México
| | - Ma Laura Ortiz-Hernández
- d Centro de Investigación en Biotecnología , Universidad Autónoma del Estado de Morelos , Cuernavaca , México
| | | | - Susana Silva-Martínez
- c Centro de Investigaciones en Ingeniería y Ciencias Aplicadas , Universidad Autónoma del Estado de Morelos , Cuernavaca , México
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15
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Synthesis of Bimetallic Nanoparticles (Au–Ag Alloy) Using Commelina nudiflora L. Plant Extract and Study its on Oral Pathogenic Bacteria. J Inorg Organomet Polym Mater 2017. [DOI: 10.1007/s10904-017-0498-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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16
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Huang T, Sui M, Li J. Inactivation of E. coli by nano-Cu/MWCNTs combined with hydrogen peroxide. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 574:818-828. [PMID: 27665442 DOI: 10.1016/j.scitotenv.2016.09.077] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 09/10/2016] [Accepted: 09/10/2016] [Indexed: 06/06/2023]
Abstract
This paper aims at the study on the antibacterial activity of nCu-MWCNTs combined with H2O2 against gram-negative bacteria Escherichia coli (E. coli). The antibacterial ability of nCu-MWCNTs/H2O2 was evaluated by traditional surface plating method, fluorescence and SEM imaging, and the effects of variables (contacting time, dose of nCu-MWCNTs and dose of H2O2) were investigated. By comparing with other five processes including H2O2, MWCNTs, nCu-MWCNTs, MWCNTs/H2O2 and nCu/H2O2, nCu-MWCNTs and H2O2 was proved to have superlative antimicrobial effectiveness against E. coli. The role of nano-Cu, MWCNTs and H2O2 in the antimicrobial activity of nCu-MWCNTs/H2O2 was clarified. The release of copper ions and formation of hydroxyl radicals (OH) both contributed the antibacterial ability of nCu-MWCNTs/H2O2 system. And MWCNTs as the support might be able to promote the electron transfer in nCu-MWCNTs for copper ion release.
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Affiliation(s)
- Tiandi Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
| | - Minghao Sui
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
| | - Jiayi Li
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
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17
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Bao Y, Qu Y, Huang J, Cagnetta G, Yu G, Weber R. First assessment on degradability of sodium p-perfluorous nonenoxybenzene sulfonate (OBS), a high volume alternative to perfluorooctane sulfonate in fire-fighting foams and oil production agents in China. RSC Adv 2017. [DOI: 10.1039/c7ra09728j] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
First report on biotic and abiotic degradability assessment of the fluorinated surfactants OBS.
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Affiliation(s)
- Yixiang Bao
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC)
- Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC)
- School of Environment
- POPs Research Center
- Tsinghua University
| | - Yingxi Qu
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC)
- Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC)
- School of Environment
- POPs Research Center
- Tsinghua University
| | - Jun Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC)
- Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC)
- School of Environment
- POPs Research Center
- Tsinghua University
| | - Giovanni Cagnetta
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC)
- Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC)
- School of Environment
- POPs Research Center
- Tsinghua University
| | - Gang Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC)
- Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC)
- School of Environment
- POPs Research Center
- Tsinghua University
| | - Roland Weber
- POPs Environmental Consulting
- D-73527 SchwäbischGmünd
- Germany
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18
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Zhao X, Takabayashi F, Ibuki Y. Coexposure to silver nanoparticles and ultraviolet A synergistically enhances the phosphorylation of histone H2AX. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 162:213-222. [PMID: 27383448 DOI: 10.1016/j.jphotobiol.2016.06.046] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 06/25/2016] [Indexed: 11/19/2022]
Abstract
Owing to the wide application of silver nanoparticles (AgNPs), the assessment of health risks associated with their use is of great importance. In this study, we revealed that the potential genotoxicity of AgNPs was enhanced by ultraviolet A (UVA) exposure. Three cultured cell lines were treated with AgNPs, followed by exposure to UVA. AgNPs induced phosphorylation of histone H2AX (γ-H2AX) following the formation of DNA double-strand breaks (DSBs), which was synergistically enhanced by UVA exposure. Enhanced γ-H2AX was observed only in cell lines that positively took up AgNPs, and microsized Ag particles, which were difficult to incorporate into cells, showed no γ-H2AX. Incorporation of AgNPs was not increased by UVA exposure. AgNO3 treatment followed by UVA exposure also induced a marked increase in γ-H2AX, indicating that the enhanced γ-H2AX was attributed to Ag ions released from AgNPs. Ag ions reacted with the -SH group of antioxidant molecules, such as glutathione, and induced intracellular oxidative conditions. 8-Hydroxy-2'-deoxyguanosine was formed in the cells treated with AgNPs, which was augmented by UVA irradiation, suggesting that intracellular oxidation caused oxidative DNA damage, leading to the enhanced formation of DSBs and γ-H2AX. Ag has been considered a safe metal; however, our results provide important insights into the influence of sunlight on the genotoxic potency of AgNPs.
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Affiliation(s)
- Xiaoxu Zhao
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Suruga, Shizuoka 422-8526, Japan
| | - Fumiyo Takabayashi
- School of Nursing, University of Shizuoka, 52-1 Yada, Suruga, Shizuoka 422-8526, Japan
| | - Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Suruga, Shizuoka 422-8526, Japan.
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19
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Khurana C, Vala AK, Andhariya N, Pandey OP, Chudasama B. Influence of antibiotic adsorption on biocidal activities of silver nanoparticles. IET Nanobiotechnol 2016; 10:69-74. [PMID: 27074856 DOI: 10.1049/iet-nbt.2015.0005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Excessive use of antibiotics has posed two major challenges in public healthcare. One of them is associated with the development of multi-drug resistance while the other one is linked to side effects. In the present investigation, the authors report an innovative approach to tackle the challenges of multi-drug resistance and acute toxicity of antibiotics by using antibiotics adsorbed metal nanoparticles. Monodisperse silver nanoparticles (SNPs) have been synthesised by two-step process. In the first step, SNPs were prepared by chemical reduction of AgNO3 with oleylamine and in the second step, oleylamine capped SNPs were phase-transferred into an aqueous medium by ligand exchange. Antibiotics - tetracycline and kanamycin were further adsorbed on the surface of SNPs. Antibacterial activities of SNPs and antibiotic adsorbed SNPs have been investigated on gram-positive (Staphylococcus aureus, Bacillus megaterium, Bacillus subtilis), and gram-negative (Proteus vulgaris, Shigella sonnei, Pseudomonas fluorescens) bacterial strains. Synergistic effect of SNPs on antibacterial activities of tetracycline and kanamycin has been observed. Biocidal activity of tetracycline is improved by 0-346% when adsorbed on SNPs; while for kanamycin, the improvement is 110-289%. This synergistic effect of SNPs on biocidal activities of antibiotics may be helpful in reducing their effective dosages.
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Affiliation(s)
- Chandni Khurana
- Laboratory of Nanomedicine, School of Physics and Materials Science, Thapar University, Patiala-147004, India
| | - Anjana K Vala
- Department of Physics, M.K. Bhavnagar University, Bhavnagar-364022, India
| | - Nidhi Andhariya
- Laboratory of Nanomedicine, School of Physics and Materials Science, Thapar University, Patiala-147004, India
| | - O P Pandey
- Laboratory of Nanomedicine, School of Physics and Materials Science, Thapar University, Patiala-147004, India
| | - Bhupendra Chudasama
- Laboratory of Nanomedicine, School of Physics and Materials Science, Thapar University, Patiala-147004, India.
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20
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Liu Y, Wang X, Wang J, Nie Y, Du H, Dai H, Wang J, Wang M, Chen S, Hei TK, Deng Z, Wu L, Xu A. Graphene Oxide Attenuates the Cytotoxicity and Mutagenicity of PCB 52 via Activation of Genuine Autophagy. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:3154-3164. [PMID: 26876502 DOI: 10.1021/acs.est.5b03895] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Graphene oxide (GO), owing to its large surface area and abundance of oxygen-containing functional groups, is emerging as a potential adsorbent for polychlorinated biphenyls (PCBs), which accumulate over time and are harmful to both natural ecosystems and human health. However, the effect of GO against PCB-induced toxicity remains largely unexplored. The present study aimed to investigate the protective effect of GO against PCB 52 induced cytotoxic and genotoxic response in mammalian cells at various exposure conditions and clarify the protective role of autophagy. Pretreatment with GO dramatically decreased PCB 52 induced cytotoxicity and CD59 gene mutation in human-hamster hybrid (AL) cells. The toxic response in cells either pretreated with PCB 52 and then treated with GO or concurrently treated with GO and PCB 52 did not differ significantly from the toxic response in the cells treated with PCB 52 alone. Using autophagy inhibitors (3-methyladenine and wortmannin) and inducers (trehalose and rapamycin), we found that genuine autophagy induced by GO was involved in decreasing PCB 52 induced toxicity. These findings suggested that GO has an antagonistic effect against the toxicity of PCB 52 mainly by triggering a genuine autophagic process, which might provide new insights into the potential application of GO in PCB disposal and environmental and health risk assessment.
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Affiliation(s)
- Yun Liu
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - Xinan Wang
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - Juan Wang
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - Yaguang Nie
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - Hua Du
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - Hui Dai
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - Jingjing Wang
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - Mudi Wang
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - Shaopeng Chen
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - Tom K Hei
- Center for Radiological Research, Department of Radiation Oncology, College of Physicians and Surgeons, Columbia University , New York, New York 10032, United States
| | - Zhaoxiang Deng
- Department of Chemistry, University of Science and Technology of China , Hefei, Anhui 230026, P. R. China
| | - Lijun Wu
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
| | - An Xu
- Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province , Hefei, Anhui 230031, P. R. China
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21
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Zhao X, Ibuki Y. Evaluating the toxicity of silver nanoparticles by detecting phosphorylation of histone H3 in combination with flow cytometry side-scattered light. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:5003-5012. [PMID: 25815977 DOI: 10.1021/acs.est.5b00542] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Post-translational modification of histones is linked to a variety of biological processes and disease states. This paper focuses on phosphorylation of histone H3 at serine 10 (p-H3S10), induced by silver nanoparticles (AgNPs) and discusses the usefulness of p-H3S10 as a marker to evaluate the toxicity of AgNPs. Cultured human cells showed remarkable p-H3S10 immediately after treatment with AgNPs but not with Ag microparticles. p-H3S10 lasts up to 24 h and strongly depends upon the cellular uptake of AgNPs. Removal of Ag ions suppressed p-H3S10, while adding an excess of Ag ions augmented p-H3S10. We expected that p-H3S10 requires two events: cellular uptake of AgNPs and continuous release of Ag ions from intracellular AgNPs. AgNPs enhanced the expression of the proto-oncogene c-jun, and p-H3S10 increased in the promoter sites of the gene, indicating that p-H3S10 might indicate a biological reaction related to carcinogenesis. We previously showed that side-scattered light from flow cytometry could be used to measure the uptake potential of nanoparticles [ Suzuki , H. ; Toyooka , T. ; Ibuki , Y. Simple and easy method to evaluate uptake potential of nanoparticles in mammalian cells using a flow cytometric light scatter analysis . Environ. Sci. Technol. 2007 , 41 ( 8 ), 3018 - 3024 ]. Our current findings suggest that p-H3S10 can be used to evaluate the toxicity of AgNPs and Ag ion release in combination with detection of side-scattered light from flow cytometry.
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Affiliation(s)
- Xiaoxu Zhao
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1, Yada, Suruga, Shizuoka, Shizuoka 422-8526, Japan
| | - Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1, Yada, Suruga, Shizuoka, Shizuoka 422-8526, Japan
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22
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Ibrahim HMM. Photocatalytic degradation of methylene blue and inactivation of pathogenic bacteria using silver nanoparticles modified titanium dioxide thin films. World J Microbiol Biotechnol 2015; 31:1049-60. [PMID: 25877701 DOI: 10.1007/s11274-015-1855-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 04/04/2015] [Indexed: 10/23/2022]
Abstract
Titanium dioxide (TiO2) is a well-studied photocatalyst that is known to break down organic molecules upon ultraviolet irradiation. TiO2 thin films were fabricated on glass substrates using the doctor-blade procedure, the film surface was modified with silver nanoparticles to increase its visible light response. The Ag-TiO2 films were characterized by transmission electron microscopy, scanning electron microscopy equipped with energy dispersive spectrometry and X-ray diffraction. The photocatalytic degradation of methylene blue (MB) and inactivation of Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus were studied. The modified films presented enhanced photocatalytic efficiency and can decompose MB solution two-times faster than the unmodified TiO2 films, under illumination of sunlight. A nominal degradation (15 %) was observed in control MB under sunlight. The degradation efficiency of Ag-TiO2 films slightly decreased after five consecutive experiments. Ag-TiO2 films revealed very effective bactericidal activity against both E. coli and S. aureus. The photocatalytic inactivation toward E. coli and S. aureus showed a similar trend with much higher effectiveness toward E. coli under the same experimental conditions. The inactivation efficiency was maximized and reached 95 % for S. aureus and 97 % for E. coli, after 180 min incubation. These results demonstrate the potential of application of Ag-TiO2 photocatalysis as a method for treatment of diluted waste waters in textile industries.
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Affiliation(s)
- Haytham M M Ibrahim
- Department of Radiation Microbiology, National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority, P.O. Box 29, Nasr City, Cairo, 11731, Egypt,
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23
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Zou X, Shi J, Zhang H. Coexistence of silver and titanium dioxide nanoparticles: enhancing or reducing environmental risks? AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2014; 154:168-75. [PMID: 24907921 DOI: 10.1016/j.aquatox.2014.05.020] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Revised: 05/15/2014] [Accepted: 05/19/2014] [Indexed: 05/25/2023]
Abstract
Due to their bactericidal and photocatalytic characteristics, silver nanoparticles (Ag NPs) and titanium dioxide nanoparticles (TiO2 NPs) are widely used in the fields of environment and physiology. Once these untreated nanoparticles are released into an aquatic environment and encounter one another, there is more uncertainty about their fate and ecotoxicological risks compared with the single nanoparticles. To expand our knowledge of the health and environmental impacts of nanoparticles, we investigated the possible risk of the co-existence of TiO2 NPs and Ag NPs in an aquatic environment using ciliated protozoa (Tetrahymena pyriformis) as an aquatic animal model. In this study, silver ion (Ag(+)) release and physicochemical properties, as well as their effect on oxidative stress biomarkers, were monitored. Continuous illumination (12,000 lx) led to the 20.0% decrease in Ag(+) release in comparison with dark conditions, while TiO2 NPs and continuous illumination resulted in decreasing the Ag(+) concentration to 64.3% in contrast with Ag NPs-only suspensions. Toxicity tests indicated that different illumination modes exerted distinct effects of TiO2 NPs on the toxicity of Ag NPs: no effects, antagonism and synergism in dark, natural light and continuous light, respectively. In the presence of 1.5mg/L (18.8 μM) TiO2 NPs, the toxicity of 1.5 mg/L (13.9 μM) Ag NPs was reduced by 28.7% and increased by 6.93% in natural light and 12,000 lx of continuous light, respectively. After culturing in 12,000 lx continuous light for 24h, SOD activity of the light control surged to 1.96 times compared to the dark control (P<0.001). TiO2 NPs induced a reduction of CAT activity by an average of (36.1±1.7) % in the light. In the natural light reductions in the toxicity of Ag, NPs decrease Ag(+) concentrations via adsorption of Ag(+) onto TiO2 NPs surfaces. The enhancement of Ag NPs toxicity can contribute to the formation of activated TiO2-Ag NPs complexes in continuous light. The existence of TiO2 NPs in various illumination modes changed the surface chemistry of Ag NPs and then led to different toxicity effects. TiO2 NPs reduce the environmental risks of Ag NPs in natural light, but in continuous light, TiO2 NPs enhance the environmental risks of Ag NPs.
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Affiliation(s)
- Xiaoyan Zou
- Institute of Urban Environment, Chinese Academy of Sciences, Jimei Road 1799, Xiamen 361021, China.
| | - Junpeng Shi
- Institute of Urban Environment, Chinese Academy of Sciences, Jimei Road 1799, Xiamen 361021, China.
| | - Hongwu Zhang
- Institute of Urban Environment, Chinese Academy of Sciences, Jimei Road 1799, Xiamen 361021, China.
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Zhao X, Toyooka T, Ibuki Y. Silver ions enhance UVB-induced phosphorylation of histone H2AX. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2014; 55:556-565. [PMID: 24838775 DOI: 10.1002/em.21875] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2013] [Revised: 04/30/2014] [Accepted: 04/30/2014] [Indexed: 06/03/2023]
Abstract
Silver (Ag) is used in a wide range of industries including healthcare, food, cosmetics, and environmental industries due to its antibacterial properties. The rapidly expanding use of Ag has raised issues concerning its toxicity in humans. However, studies investigating the effects of Ag on humans are very limited, and the combined effects of Ag and other environmental factors have not yet been determined. Ultraviolet (UV) radiation in sunlight is the most prominent and ubiquitous physical stressor in our natural environment. In this study, we investigated the genotoxic potential of combined exposure to Ag(+) (AgNO3) and UVB in the human keratinocyte cell line, HaCaT, by measuring the generation of phosphorylated histone H2AX, which is currently attracting attention as a biomarker for the detection of genotoxic insults. We found that the generation of γ-H2AX was synergistically enhanced when cells were coexposed to Ag(+) and UVB. Furthermore, we showed that the enhanced generation of γ-H2AX could be attributed to the increased formation of UVB-induced cyclobutane pyrimidine dimers and (6-4) photoproducts. These lesions, if not repaired properly, are the major causal factor for skin carcinogenesis. Our results provide an important insight into influence of Ag on the genotoxic potency of sunlight.
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Affiliation(s)
- Xiaoxu Zhao
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka-Shi, Shizuoka, Japan
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25
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Li Y, Niu J, Shang E, Crittenden J. Photochemical transformation and photoinduced toxicity reduction of silver nanoparticles in the presence of perfluorocarboxylic acids under UV irradiation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:4946-4953. [PMID: 24673243 DOI: 10.1021/es500596a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The impact of perfluorocarboxylic acids (PFCAs) with carbon chain length C2 to C8 on the dissolution, aggregation, reactive oxygen species (ROS) generation, and toxicity of citrate-coated AgNPs was investigated under UV irradiation. The presence of PFCAs decreased dissolution, aggregation, ROS generation, and toxicity of AgNPs because the negatively charged PFCAs sorbed on AgNP surface enhanced their stability. Both dissolution and aggregation rate of AgNPs decreased with chain length of PFCAs under UV irradiation, primarily because PFCAs with longer chain length sorbed on AgNP surface could form thicker coatings. The dissolution of AgNPs followed pseudo-first-order kinetics, and the rate constant decreased from 0.58 h(-1) with C2 to 0.30 h(-1) with C8. The hydrodynamic diameters of AgNPs linearly increased under UV irradiation with aggregation rates ranged from 72.1 to 143.5 nm/h. O2(•-) generation was observed in AgNP suspension with quantum yield of 0.12%, but was completely suppressed by PFCAs because they inhibited the interaction between photoelectrons and O2. A linear correlation was established between dissolved Ag(+) and bacterial survival rates of AgNPs with and without PFCAs under UV irradiation. This study highlights the necessity of considering coexisting organic contaminants when investigating the environmental behaviors of AgNPs.
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Affiliation(s)
- Yang Li
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University , Beijing 100875, People's Republic of China
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26
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Li Y, Niu J, Zhang W, Zhang L, Shang E. Influence of aqueous media on the ROS-mediated toxicity of ZnO nanoparticles toward green fluorescent protein-expressing Escherichia coli under UV-365 irradiation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2852-2862. [PMID: 24568235 DOI: 10.1021/la5000028] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The aqueous media could affect the physicochemical properties (e.g., surface charge, morphology, and aggregation) of ZnO nanoparticles (nZnO), leading to their different environmental impacts. In this study, the toxicity of nZnO toward the green fluorescent protein-expressing Escherichia coli cells under UV-365 light irradiaiton in various media was assessed, including deionized (DI) water, 0.85% NaCl, phosphate-buffered saline (PBS), minimal Davis medium (MD), and Luria-Bertani medium (LB). The toxicity of nZnO was assessed by the conventional plate count method and the fluorescence intensity method, which consistently demonstrated that the nZnO toxicity was dependent on the medium components that varied the potency of reactive oxygen species (ROS) generation. In DI, NaCl, PBS, and MD medium, nZnO generated three types of ROS (O2(•-), •OH, and (1)O2), whereas in LB medium, nZnO generated O2(•-) and (1)O2. The total concentrations of ROS generated by nZnO in DI, NaCl, PBS, MD, and LB were 265.5 ± 15.9, 153.6 ± 8.6, 144.3 ± 6.9, 123.0 ± 6.0, and 115.6 ± 4.5 μM, respectively. Furthermore, a linear correlation was established between the total concentrations of three types of ROS generated by nZnO and their bacterial mortality rate (R(2) = 0.92) in various media. Since the released Zn(2+) from nZnO under UV irradiation only accounted for less than 10% of the total Zn in all media, the ionic forms of zinc did not significantly contribute to the overall toxicity. This work aims at providing further insight into the medium type influences on the ROS production and the toxicity of nZnO toward the E. coli cells.
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Affiliation(s)
- Yang Li
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University , Beijing 100875, People's Republic of China
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