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Fakeeha G, AlHarbi S, Auda S, Balto H. The Impact of Silver Nanoparticles' Size on Biofilm Eradication. Int Dent J 2024:S0020-6539(24)01418-7. [PMID: 39266402 DOI: 10.1016/j.identj.2024.08.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2024] [Revised: 07/29/2024] [Accepted: 08/06/2024] [Indexed: 09/14/2024] Open
Abstract
INTRODUCTION Efficient intracanal disinfection is required for a successful regenerative endodontic treatment. Thus, this study aimed to identify the silver nanoparticles' (NPs) size (AgNPs) with the highest antibiofilm efficacy when mixed with calcium hydroxide [Ca(OH)2] to eradicate an in vitro endodontic biofilm. METHODS The various sizes of AgNPs and mixtures were characterized by scanning electron microscopy, transmission electron microscopy, and ultraviolet-visible spectroscopy. A total of 168 dentin root segments were prepared, sterilized, and inoculated for 3 weeks with Actinomyces naeslundii and Fusobacterium nucleatum. Samples were randomly allocated to 4 experimental groups (n = 28/group): 2 nm AgNPs + 35% Ca(OH)2, 5 nm AgNPs + 35% Ca(OH)2, 10 nm AgNPs + 35% Ca(OH)2, and 35% Ca(OH)2 alone. Samples exposed to saline and triple antibiotic paste (TAP) acted as negative and positive control groups, respectively. After 1 and 2 weeks, samples were stained with LIVE/DEAD BacLight dye and examined under a confocal laser scanning microscope to determine the proportion of dead bacteria. RESULTS The characterization procedure revealed a spherical NP's structure with minor aggregations. Except for Ca(OH)2 group, all groups had significantly higher antibiofilm efficacy at 2 weeks. Both the 10 nm mixture (99.5%) and TAP (99.2%) exhibited the highest antibiofilm efficacy at 2 weeks and were not significantly different from one another (P > .05). No significant difference was noted between the 2 and 5 nm mixtures at 1 week (81% and 84%) and 2 weeks (89% and 91%). CONCLUSION The 10 nm AgNPs (0.02%) + 35% Ca(OH)2 mixture exhibited the highest antibiofilm efficacy at 2 weeks compared to all other mixtures at both observation periods. Interestingly, the 10 nm mixture performed similarly to TAP at 2 weeks. Excluding Ca(OH)2 group, longer application significantly improved the antibiofilm efficacy of all tested medicaments. CLINICAL RELEVANCE The 10 nm AgNPs + 35% Ca(OH)2 mixture revealed promising results as an intracanal medicament in the regenerative endodontic treatment protocol.
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Affiliation(s)
- Ghazal Fakeeha
- Department of Restorative Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
| | - Sarah AlHarbi
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Sayed Auda
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Hanan Balto
- Department of Restorative Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
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Li J, Li J, Chen Y, Tai P, Fu P, Chen Z, Yap PS, Nie Z, Lu K, He B. Molybdenum Disulfide-Supported Cuprous Oxide Nanocomposite for Near-Infrared-I Light-Responsive Synergistic Antibacterial Therapy. ACS NANO 2024; 18:16184-16198. [PMID: 38864540 DOI: 10.1021/acsnano.4c01452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
Drug-resistant bacterial infections pose a serious threat to human health; thus, there is an increasingly growing demand for nonantibiotic strategies to overcome drug resistance in bacterial infections. Mild photothermal therapy (PTT), as an attractive antibacterial strategy, shows great potential application due to its good biocompatibility and ability to circumvent drug resistance. However, its efficiency is limited by the heat resistance of bacteria. Herein, Cu2O@MoS2, a nanocomposite, was constructed by the in situ growth of Cu2O nanoparticles (NPs) on the surface of MoS2 nanosheets, which provided a controllable photothermal therapeutic effect of MoS2 and the intrinsic catalytic properties of Cu2O NPs, achieving a synergistic effect to eradicate multidrug-resistant bacteria. Transcriptome sequencing (RNA-seq) results revealed that the antibacterial process was related to disrupting the membrane transport system, phosphorelay signal transduction system, oxidative stress response system, as well as the heat response system. Animal experiments indicated that Cu2O@MoS2 could effectively treat wounds infected with methicillin-resistant Staphylococcus aureus. In addition, satisfactory biocompatibility made Cu2O@MoS2 a promising antibacterial agent. Overall, our results highlight the Cu2O@MoS2 nanocomposite as a promising solution to combating resistant bacteria without inducing the evolution of antimicrobial resistance.
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Affiliation(s)
- Jiao Li
- Department of Laboratory Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, China
| | - Jie Li
- Department of Radiology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, 420 Fu Ma Road, Fuzhou, Fujian 350001, China
| | - Yuli Chen
- Department of Laboratory Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, China
| | - Ping Tai
- Department of Laboratory Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, China
| | - Peiwen Fu
- Department of Laboratory Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, China
| | - Zhonghao Chen
- Key Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering, Westlake University, Hangzhou 310024, China
| | - Pow-Seng Yap
- Department of Civil Engineering, Xi'an Jiaotong-Liverpool University, Suzhou 215123, China
| | - Zhenlin Nie
- Department of Laboratory Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, China
| | - Kun Lu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Bangshun He
- Department of Laboratory Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, China
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Li J, Yu L, Wang R, Lan J, Li M, Qiao Y, Tao Z, Lü H, Wang F, Fang Q, Guo P. The role of silver nanoparticles alone and combined with imipenem on carbapenem-resistant Klebsiella pneumoniae. J Appl Microbiol 2024; 135:lxae077. [PMID: 38544327 DOI: 10.1093/jambio/lxae077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 03/11/2024] [Accepted: 03/26/2024] [Indexed: 05/07/2024]
Abstract
AIMS Carbapenem-resistant Klebsiella pneumoniae (CRKP) infections poses a significant threat to human health, necessitating urgent development of new antimicrobial agents. Silver nanoparticles (AgNPs), which are among the most widely used engineered nanomaterials, have been extensively studied. However, the impact of AgNPs on CRKP and the potential for drug resistance development remain inadequately explored. METHODS AND RESULTS In this study, broth dilution method was used to determine the minimum inhibitory concentration (MIC) was determined using the broth dilution method. Results indicated MIC values of 93.1 ± 193.3 µg ml-1 for AgNPs, 2.3 ± 5.1 µg ml-1 for AgNO3, and 25.1 ± 48.3 µg ml-1 for imipenem (IMI). The combined inhibitory effect of AgNPs and IMI on CRKP was assessed using the checkerboard method. Moreover, after 6-20 generations of continuous culture, the MIC value of AgNPs increased 2-fold. Compared to IMI, resistance of Kl. pneumoniae to AgNPs developed more slowly, with a higher fold increase in MIC observed after 20 generations. Whole-genome sequencing revealed four nonsynonymous single nucleotide polymorphism mutations in CRKP after 20 generations of AgNP treatment. CONCLUSION We have demonstrated that AgNPs significantly inhibit CRKP isolates and enhance the antibacterial activity of imipenem against Kl. pneumoniae. Although the development of AgNP resistance is gradual, continued efforts are necessary for monitoring and studying the mechanisms of AgNP resistance.
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Affiliation(s)
- Jiangyan Li
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
- Anhui Province Key Laboratory of Basic and Translational Research of Inflammation-related Diseases, Changhuai Road 287, Bengbu, Anhui Province 233030, China
| | - Lian Yu
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Ruirui Wang
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Jiaqi Lan
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Ming Li
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Yan Qiao
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
| | - Zhaoyu Tao
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Hezuo Lü
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
| | - Fengchao Wang
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
| | - Qiang Fang
- Bengbu Medical University, Donghaidadao 2600, Bengbu, Anhui Province 233030, China
| | - Pu Guo
- Department of Clinical Laboratory, The First Affiliated Hospital of Bengbu Medical University, Changhuai Road 287, Bengbu, Anhui Province 233030, China
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Li H, Xu H. Mechanisms of bacterial resistance to environmental silver and antimicrobial strategies for silver: A review. ENVIRONMENTAL RESEARCH 2024; 248:118313. [PMID: 38280527 DOI: 10.1016/j.envres.2024.118313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/22/2024] [Accepted: 01/23/2024] [Indexed: 01/29/2024]
Abstract
The good antimicrobial properties of silver make it widely used in food, medicine, and environmental applications. However, the release and accumulation of silver-based antimicrobial agents in the environment is increasing with the extensive use of silver-based antimicrobials, and the prevalence of silver-resistant bacteria is increasing. To prevent the emergence of superbugs, it is necessary to exercise rational and strict control over drug use. The mechanism of bacterial resistance to silver has not been fully elucidated, and this article provides a review of the progress of research on the mechanism of bacterial resistance to silver. The results indicate that bacterial resistance to silver can occur through inducing silver particles aggregation and Ag+ reduction, inhibiting silver contact with and entry into cells, efflux of silver particles and Ag+ in cells, and activation of damage repair mechanisms. We propose that the bacterial mechanism of silver resistance involves a combination of interrelated systems. Finally, we discuss how this information can be used to develop the next generation of silver-based antimicrobials and antimicrobial therapies. And some antimicrobial strategies are proposed such as the "Trojan Horse" - camouflage, using efflux pump inhibitors to reduce silver efflux, working with "minesweeper", immobilization of silver particles.
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Affiliation(s)
- Hui Li
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China
| | - Hengyi Xu
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China.
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Wang Z, Tian Y, Hao J, Liu Y, Tang J, Xu Z, Liu Y, Tang B, Huang X, Zhu N, Li Z, Hu L, Li L, Wang Y, Jiang G. Chiral Nanoclusters as Alternative Therapeutic Strategies to Confront the Health Threat from Antibiotic-Resistant Pathogens. ACS NANO 2024; 18:7253-7266. [PMID: 38380803 DOI: 10.1021/acsnano.3c13044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Pseudomonas aeruginosa (P. aeruginosa), a drug-resistant Gram-negative pathogen, is listed among the "critical" group of pathogens by the World Health Organization urgently needing efficacious antibiotics in the clinics. Nanomaterials especially silver nanoparticles (AgNPs) due to the broad-spectrum antimicrobial activity are tested in antimicrobial therapeutic applications. Pathogens rapidly develop resistance to AgNPs; however, the health threat from antibiotic-resistant pathogens remains challenging. Here we present a strategy to prevent bacterial resistance to silver nanomaterials through imparting chirality to silver nanoclusters (AgNCs). Nonchiral AgNCs with high efficacy against P. aeruginosa causes heritable resistance, as indicated by a 5.4-fold increase in the minimum inhibitory concentration (MIC) after 9 repeated passages. Whole-genome sequencing identifies a Rhs mutation related to the wall of Gram-negative bacteria that possibly causes morphology changes in resistance compared to susceptible P. aeruginosa. Nevertheless, AgNCs with laevorotary chirality (l-AgNCs) induce negligible resistance even after 40 repeated passages and maintain a superior antibacterial efficiency at the MIC. l-AgNCs also show high cytocompatibility; negligible cytotoxicity to mammalian cells including JB6, H460, HEK293, and RAW264.7 is observed even at 30-fold MIC. l-AgNCs thus are examined as an alternative to levofloxacin in vivo, healing wound infections of P. aeruginosa efficaciously. This work provides a potential opportunity to confront the rising threat of antimicrobial resistance by developing chiral nanoclusters.
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Affiliation(s)
- Zhe Wang
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yijin Tian
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jinghua Hao
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ya Liu
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
| | - Jie Tang
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhenlan Xu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Yin Liu
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
| | - Biao Tang
- School of Life Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
| | - Xiu Huang
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610065, China
| | - Nali Zhu
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
| | - Zhigang Li
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
| | - Ligang Hu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Lingxiangyu Li
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
| | - Yawei Wang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Guibin Jiang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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Kim DY, Patel SKS, Rasool K, Lone N, Bhatia SK, Seth CS, Ghodake GS. Bioinspired silver nanoparticle-based nanocomposites for effective control of plant pathogens: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 908:168318. [PMID: 37956842 DOI: 10.1016/j.scitotenv.2023.168318] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 09/15/2023] [Accepted: 11/02/2023] [Indexed: 11/15/2023]
Abstract
Plant pathogens, including bacteria, fungi, and viruses, pose significant challenges to the farming community due to their extensive diversity, the rapidly evolving phenomenon of multi-drug resistance (MDR), and the limited availability of effective control measures. Amid mounting global pressure, particularly from the World Health Organization, to limit the use of antibiotics in agriculture and livestock management, there is increasing consideration of engineered nanomaterials (ENMs) as promising alternatives for antimicrobial applications. Studies focusing on the application of ENMs in the fight against MDR pathogens are receiving increasing attention, driven by significant losses in agriculture and critical knowledge gaps in this crucial field. In this review, we explore the potential contributions of silver nanoparticles (AgNPs) and their nanocomposites in combating plant diseases, within the emerging interdisciplinary arena of nano-phytopathology. AgNPs and their nanocomposites are increasingly acknowledged as promising countermeasures against plant pathogens, owing to their unique physicochemical characteristics and inherent antimicrobial properties. This review explores recent advancements in engineered nanocomposites, highlights their diverse mechanisms for pathogen control, and draws attention to their potential in antibacterial, antifungal, and antiviral applications. In the discussion, we briefly address three crucial dimensions of combating plant pathogens: green synthesis approaches, toxicity-environmental concerns, and factors influencing antimicrobial efficacy. Finally, we outline recent advancements, existing challenges, and prospects in scholarly research to facilitate the integration of nanotechnology across interdisciplinary fields for more effective treatment and prevention of plant diseases.
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Affiliation(s)
- Dae-Young Kim
- Department of Biological and Environmental Science, Dongguk University-Seoul, 32 Dongguk-ro, Ilsandong-gu, Goyang-si 10326, Gyeonggi-do, Republic of Korea
| | | | - Kashif Rasool
- Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University, Qatar Foundation, Doha, Qatar
| | - Nasreena Lone
- School of Allied Healthcare and Sciences, JAIN Deemed University, Whitefield, Bangalore 560066, India
| | - Shashi Kant Bhatia
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea
| | | | - Gajanan Sampatrao Ghodake
- Department of Biological and Environmental Science, Dongguk University-Seoul, 32 Dongguk-ro, Ilsandong-gu, Goyang-si 10326, Gyeonggi-do, Republic of Korea.
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Salas-Orozco MF, Lorenzo-Leal AC, de Alba Montero I, Marín NP, Santana MAC, Bach H. Mechanism of escape from the antibacterial activity of metal-based nanoparticles in clinically relevant bacteria: A systematic review. NANOMEDICINE : NANOTECHNOLOGY, BIOLOGY, AND MEDICINE 2024; 55:102715. [PMID: 37907198 DOI: 10.1016/j.nano.2023.102715] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 08/05/2023] [Accepted: 10/05/2023] [Indexed: 11/02/2023]
Abstract
The emergency of antibiotic-resistant bacteria in severe infections is increasing, especially in nosocomial environments. The ESKAPE group is of special importance in the groups of multi-resistant bacteria due to its high capacity to generate resistance to antibiotics and bactericides. Therefore, metal-based nanomaterials are an attractive alternative to combat them because they have been demonstrated to damage biomolecules in the bacterial cells. However, there is a concern about bacteria developing resistance to NPs and their harmful effects due to environmental accumulation. Therefore, this systematic review aims to report the clinically relevant bacteria that have developed resistance to the NPs. According to the results of this systematic review, various mechanisms to counteract the antimicrobial activity of various NP types have been proposed. These mechanisms can be grouped into the following categories: production of extracellular compounds, metal efflux pumps, ROS response, genetic changes, DNA repair, adaptative morphogenesis, and changes in the plasma membrane.
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Affiliation(s)
- Marco Felipe Salas-Orozco
- Facultad de Estomatología, Doctorado en Ciencias Odontológicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico.
| | - Ana Cecilia Lorenzo-Leal
- Division of Infectious Diseases, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | | | - Nuria Patiño Marín
- Facultad de Estomatología, Laboratorio de Investigación Clinica, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
| | - Miguel Angel Casillas Santana
- Maestría en Estomatología con Opcion Terminal en Ortodoncia, Facultad de Estomatología, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
| | - Horacio Bach
- Division of Infectious Diseases, Department of Medicine, University of British Columbia, Vancouver, BC, Canada.
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Kaur S, Dadwal R, Nandanwar H, Soni S. Limits of antibacterial activity of triangular silver nanoplates and photothermal enhancement thereof for Bacillus subtilis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2023; 247:112787. [PMID: 37738748 DOI: 10.1016/j.jphotobiol.2023.112787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 08/28/2023] [Accepted: 09/16/2023] [Indexed: 09/24/2023]
Abstract
Currently, nanoparticles are being actively explored for antimicrobial applications involving variety of pathogens. Bacillus subtilis is a major concern considering its sporulation and biofilm formation capability which involves high bacteria loadings. Also, there is natural ability of B subtilis to adapt and develop resistance to the silver nanoparticles alone. So, this study reports the limits of antibacterial activity of triangular silver nanoplates (∆AgNPs) and further photothermal enhancement for B. subtilis ATCC 6051 for considerably high bacterial load of 2.5 × 107 to 5 × 108 CFU/ml. Triangular silver nanoplates were synthesized using one pot synthesis method and showed significant photothermal response i.e., ∼36 °C temperature rise on near infrared irradiation as well as photothermal stability. Triangular silver nanoplates alone showed absolute destruction for 2.5 × 107 CFU/ml initial B. subtilis load in 5 min. Whereas, for further higher bacterial loads, the antibacterial efficacy of ∆AgNPs is observed to be insignificant. For higher initial bacterial loads of 5 × 107 CFU/ml and 5 × 108 CFU/ml, photothermally enhanced triangular silver nanoplates resulted in complete destruction of bacteria in about 5 and 10 min, respectively. Antibacterial efficacy and mechanism of the destruction assessed via scanning electron microscopy and LIVE/DEAD assay confirmed morphological deformities. Further the generation of higher levels of reactive oxygen species is also confirmed due to photothermal activation of ∆AgNPs. The study concludes that ∆AgNPs alone are effective only up to bacterial load of 2.5 × 107 CFU/ml. Whereas, for higher bacterial loads of B. subtilis, photothermally activated ∆AgNPs lead to irreversible damage due to multiple targeting mechanisms leading to absolute elimination in short span of 5-10 min for the chosen irradiation conditions. Ultimately, this study demonstrates photothermally enhanced silver nanoplates as a potential antimicrobial agent for considerably high bacterial loads of B. subtilis. Overall, the broader window of considered high bacterial loadings and its irradiation by this technique shows the full-proof nature of photothermal applications for scenarios involving high cell density such as biofilms and wound infections etc. Further, the concept may be useful for sterilization or decontamination of samples, devices, etc. because B. subtilis and its spores are the challenges during sterilization.
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Affiliation(s)
- Sarabjot Kaur
- CSIR-Central Scientific Instruments Organisation, Sector 30-C, Chandigarh 160030, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Rajneesh Dadwal
- CSIR-Institute of Microbial Technology, Sector-39, Chandigarh 160036, India
| | - Hemraj Nandanwar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India; CSIR-Institute of Microbial Technology, Sector-39, Chandigarh 160036, India
| | - Sanjeev Soni
- CSIR-Central Scientific Instruments Organisation, Sector 30-C, Chandigarh 160030, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India.
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McNeilly O, Mann R, Cummins ML, Djordjevic SP, Hamidian M, Gunawan C. Development of Nanoparticle Adaptation Phenomena in Acinetobacter baumannii: Physiological Change and Defense Response. Microbiol Spectr 2023; 11:e0285722. [PMID: 36625664 PMCID: PMC9927149 DOI: 10.1128/spectrum.02857-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 12/17/2022] [Indexed: 01/11/2023] Open
Abstract
The present work describes the evolution of a resistance phenotype to a multitargeting antimicrobial agent, namely, silver nanoparticles (nanosilver; NAg), in the globally prevalent bacterial pathogen Acinetobacter baumannii. The Gram-negative bacterium has recently been listed as a critical priority pathogen requiring novel treatment options by the World Health Organization. Through prolonged exposure to the important antimicrobial nanoparticle, the bacterium developed mutations in genes that encode the protein subunits of organelle structures that are involved in cell-to-surface attachment as well as in a cell envelope capsular polysaccharide synthesis-related gene. These mutations are potentially correlated with stable physiological changes in the biofilm growth behavior and with an evident protective effect against oxidative stress, most likely as a feature of toxicity defense. We further report a different adaptation response of A. baumannii to the cationic form of silver (Ag+). The bacterium developed a tolerance phenotype to Ag+, which was correlated with an indicative surge in respiratory activity and changes in cell morphology, of which these are reported characteristics of tolerant bacterial populations. The findings regarding adaptation phenomena to NAg highlight the risks of the long-term use of the nanoparticle on a priority pathogen. The findings urge the implementation of strategies to overcome bacterial NAg adaptation, to better elucidate the toxicity mechanisms of the nanoparticle, and preserve the efficacy of the potent alternative antimicrobial agent in this era of antimicrobial resistance. IMPORTANCE Several recent studies have reported on the development of bacterial resistance to broad-spectrum antimicrobial silver nanoparticles (nanosilver; NAg). NAg is currently one of the most important alternative antimicrobial agents. However, no studies have yet established whether Acinetobacter baumannii, a globally prevalent nosocomial pathogen, can develop resistance to the nanoparticle. The study herein describes how a model strain of A. baumannii with no inherent silver resistance determinants developed resistance to NAg, following prolonged exposure. The stable physiological changes are correlated with mutations detected in the bacterium genome. These mutations render the bacterium capable of proliferating at a toxic NAg concentration. It was also found that A. baumannii developed a "slower-to-kill" tolerance trait to Ag+, which highlights the unique antimicrobial activities between the nanoparticulate and the ionic forms of silver. Despite the proven efficacy of NAg, the observation of NAg resistance in A. baumannii emphasises the potential risks of the repeated overuse of this agent on a priority pathogen.
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Affiliation(s)
- Oliver McNeilly
- Australian Institute of Microbiology and Infection, University of Technology Sydney, Broadway, New South Wales, Australia
| | - Riti Mann
- Australian Institute of Microbiology and Infection, University of Technology Sydney, Broadway, New South Wales, Australia
| | - Max Laurence Cummins
- Australian Institute of Microbiology and Infection, University of Technology Sydney, Broadway, New South Wales, Australia
- Australian Centre for Genomic Epidemiological Microbiology, University of Technology Sydney, Broadway, New South Wales, Australia
| | - Steven P. Djordjevic
- Australian Institute of Microbiology and Infection, University of Technology Sydney, Broadway, New South Wales, Australia
- Australian Centre for Genomic Epidemiological Microbiology, University of Technology Sydney, Broadway, New South Wales, Australia
| | - Mehrad Hamidian
- Australian Institute of Microbiology and Infection, University of Technology Sydney, Broadway, New South Wales, Australia
| | - Cindy Gunawan
- Australian Institute of Microbiology and Infection, University of Technology Sydney, Broadway, New South Wales, Australia
- School of Chemical Engineering, University of New South Wales, Sydney, New South Wales, Australia
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10
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Kamat S, Kumari M. Emergence of microbial resistance against nanoparticles: Mechanisms and strategies. Front Microbiol 2023; 14:1102615. [PMID: 36778867 PMCID: PMC9909277 DOI: 10.3389/fmicb.2023.1102615] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Accepted: 01/03/2023] [Indexed: 01/28/2023] Open
Abstract
Antimicrobial nanoparticles have gained the status of a new generation of drugs that can kill bacterial pathogens by multiple means; however, nanoparticle resistance acquired by some bacterial pathogens has evoked a cause of concern. Several reports suggested that bacteria can develop nanoparticles, specifically metal nanoparticle resistance, by mechanisms: nanoparticle transformation-induced oxidative stress, membrane alterations, reversible adaptive resistance, irreversible modifications to cell division, and a change in bacterial motility and resistance. Surface properties, concentration and aggregation of nanoparticles, biofilm forming and metal exclusion capacity, and R plasmid and flagellin synthesis by bacteria are crucial factors in the development of nanoparticle resistance in bacteria. Studies reported the resistance reversal by modifying the surface corona of nanoparticles or inhibiting flagellin production by bacterial pathogens. Furthermore, strict regulation regarding the use and disposal of nano-waste across the globe, the firm knowledge of microbe-nanoparticle interaction, and the regulated disposal of nanoparticles in soil and water is required to prevent microbes from developing nanoparticle resistance.
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Krutyakov YA, Khina AG. Bacterial Resistance to Nanosilver: Molecular Mechanisms and Possible Ways to Overcome them. APPL BIOCHEM MICRO+ 2022. [DOI: 10.1134/s0003683822050106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Khammar Z, Sadeghi E, Raesi S, Mohammadi R, Dadvar A, Rouhi M. Optimization of biosynthesis of stabilized silver nanoparticles using bitter orange peel by-products and glycerol. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2022. [DOI: 10.1016/j.bcab.2022.102425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Comparative Analysis of the Mechanism of Resistance to Silver Nanoparticles and the Biocide 2,2-Dibromo-3-Nitrilopropionamide. Antimicrob Agents Chemother 2022; 66:e0203121. [PMID: 35604211 DOI: 10.1128/aac.02031-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Antimicrobials such as nanoparticles and biocides are used to control microbial growth. We used Escherichia coli to study the process of acquired resistance to silver nanoparticles (Ag-NP) and the industrial biocide DBNPA when grown in sub-MICs. We determined the MICs of these two antimicrobials against E. coli. We then performed an experimental evolution study where E. coli was grown in subinhibitory concentrations of the antimicrobials and transferred 10 times. We then tracked the changes in growth characteristics, lactate dehydrogenase (LDH) activity, reactive oxidative species (ROS) production, and the role of efflux pumps in conferring resistance. We also performed genome sequencing to determine the genetic basis for acquired resistance. Our results showed that E. coli could rapidly develop resistance to Ag-NP and DBNPA after growth in low concentrations of the antimicrobials. The expression of efflux pumps plays a vital role in both Ag-NP and DBNPA resistance. Multiple mutations occurred in the adapted strains that may confer resistance to both Ag-NP and DBNPA. Our study provides insights into mechanisms of adaptation and resistance to antimicrobials. Our results suggest that there are some shared mechanisms to resist nanoparticles and biocides as well as some key differences. The mechanism of resistance to Ag-NP might be related to flagellin production, while efflux pumps seem to be associated with resistance to DBNPA. This work provides a comparative study of the mechanisms of acquired resistance to these two types of antimicrobials.
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Qin S, Xie M, Cao S, Li J, Wang L, Luo S, Lv M. Insight into the antibacterial resistance of graphdiyne functionalized by silver nanoparticles. Cell Prolif 2022; 55:e13236. [PMID: 35502645 PMCID: PMC9136490 DOI: 10.1111/cpr.13236] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 04/02/2022] [Accepted: 04/06/2022] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVES Silver nanoparticles (AgNPs) tend to aggregate spontaneously due to larger surface-to-volume ratio, which causes decreased antibacterial activity and even enhanced antimicrobial resistance (AMR). Here, we aim to improve the stability of AgNPs by employing a growth anchor graphdiyne (GDY) to overcome these shortcomings. MATERIALS AND METHODS Bacillus subtilis and Escherichia coli were selected to represent gram-positive and gram-negative bacteria, respectively. Transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM)-EDS mapping and inductively coupled plasma mass spectrometry (ICP-MS) were carried out to characterize the physiochemical properties of materials. The antimicrobial property was determined by turbidimetry and plate colony-counting methods. The physiology of bacteria was detected by SEM and confocal imaging, such as morphology, reactive oxygen species (ROS) and cell membrane. RESULTS We successfully synthesized a hybrid graphdiyne @ silver nanoparticles (GDY@Ag) by an environment-friendly approach without any reductants. The hybrid showed high stability and excellent broad-spectrum antibacterial activity towards both gram-positive and gram-negative bacteria. It killed bacteria through membrane destruction and ROS production. Additionally, GDY@Ag did not induce the development of the bacterial resistance after repeated exposure. CONCLUSIONS GDY@Ag composite combats bacteria by synergetic action of GDY and AgNPs. Especially, GDY@Ag can preserve its bacterial susceptibility after repeated exposure compared to antibiotics. Our findings provide an avenue to design innovative antibacterial agents for effective sterilization.
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Affiliation(s)
- Simin Qin
- Division of Physical Biology, CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Institute of Applied Physics, Chinese Academy of SciencesShanghaiChina
- University of Chinese Academy of SciencesBeijingChina
| | - Mo Xie
- State Key Laboratory of Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts and TelecommunicationsNanjingChina
| | - Shuting Cao
- Division of Physical Biology, CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Institute of Applied Physics, Chinese Academy of SciencesShanghaiChina
- University of Chinese Academy of SciencesBeijingChina
| | - Jiang Li
- Division of Physical Biology, CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Institute of Applied Physics, Chinese Academy of SciencesShanghaiChina
- The Interdisciplinary Research Center, Shanghai Synchrotron Radiation Facility, Zhangjiang LaboratoryShanghai Advanced Research Institute, Chinese Academy of SciencesShanghaiChina
| | - Lihua Wang
- Division of Physical Biology, CAS Key Laboratory of Interfacial Physics and TechnologyShanghai Institute of Applied Physics, Chinese Academy of SciencesShanghaiChina
- The Interdisciplinary Research Center, Shanghai Synchrotron Radiation Facility, Zhangjiang LaboratoryShanghai Advanced Research Institute, Chinese Academy of SciencesShanghaiChina
| | - Shi‐Hua Luo
- Department of Traumatology, Rui Jin Hospital, School of MedicineShanghai Jiao Tong UniversityShanghaiChina
| | - Min Lv
- The Interdisciplinary Research Center, Shanghai Synchrotron Radiation Facility, Zhangjiang LaboratoryShanghai Advanced Research Institute, Chinese Academy of SciencesShanghaiChina
- College of Chemistry and Materials ScienceShanghai Normal UniversityShanghaiChina
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15
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Yonathan K, Mann R, Mahbub KR, Gunawan C. The impact of silver nanoparticles on microbial communities and antibiotic resistance determinants in the environment. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 293:118506. [PMID: 34793904 DOI: 10.1016/j.envpol.2021.118506] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 10/14/2021] [Accepted: 11/13/2021] [Indexed: 06/13/2023]
Abstract
Nanosilver (NAg) is currently one of the major alternative antimicrobials to control microorganisms. With its broad-spectrum efficacy and lucrative commercial values, NAg has been used in medical devices and increasingly, in consumer products and appliances. This widespread use has inevitably led to the release and accumulation of the nanoparticle in water and sediment, in soil and even, wastewater treatment plants (WWTPs). This Article describes the physical and chemical transformations of NAg as well as the impact of the nanoparticle on microbial communities in different environmental settings; how the nanoparticle shifts not only the diversity and abundance of microbes, including those that are important in nitrogen cycles and decomposition of organic matters, but also their associated genes and in turn, the key metabolic processes. Current findings on the microbiological activity of the leached soluble silver, solid silver particulates and their respective transformed products, which underpin the mechanism of the nanoparticle toxicity in environmental microbes, is critically discussed. The Article also addresses the emerging evidence of silver-driven co-selection of antibiotic resistance determinants. The mechanism has been linked to the increasing pools of many antibiotic resistance genes already detected in samples from different environmental settings, which could ultimately find their ways to animals and human. The realized ecological impact of NAg calls for more judicial use of the nanoparticle. The generated knowledge can inform strategies for a better 'risks versus benefits' assessment of NAg applications, including the disposal stage.
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Affiliation(s)
- Kevin Yonathan
- iThree Institute, University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia
| | - Riti Mann
- iThree Institute, University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia
| | - Khandaker Rayhan Mahbub
- School of Life Sciences, University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia; South Australian Research and Development Institute, Primary Industries and Regions SA, Urrbrae, SA 5064, Australia
| | - Cindy Gunawan
- iThree Institute, University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia; School of Chemical Engineering, University of New South Wales, NSW 2052, Australia.
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16
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Haidari H, Bright R, Kopecki Z, Zilm PS, Garg S, Cowin AJ, Vasilev K, Goswami N. Polycationic Silver Nanoclusters Comprising Nanoreservoirs of Ag + Ions with High Antimicrobial and Antibiofilm Activity. ACS APPLIED MATERIALS & INTERFACES 2022; 14:390-403. [PMID: 34935355 DOI: 10.1021/acsami.1c21657] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Silver-based nano-antibiotics are rapidly developing as promising alternatives to conventional antibiotics. Ideally, to remain potent against a wide range of drug-resistant and anaerobic bacteria, silver-based nano-antibiotics should easily penetrate through the bacterial cell walls and actively release silver ions. In this study, highly monodispersed, ultrasmall (<3 nm), polycationic silver nanoclusters (pAgNCs) are designed and synthesized for the elimination of a range of common Gram-negative and Gram-positive pathogens and their corresponding established and matured biofilms, including those composed of multiple species. The pAgNCs also show greatly enhanced antibacterial efficacy against anaerobic bacteria such as Fusobacterium nucleatum and Streptococcus sanguinis. These results demonstrate that the cationic nature facilitates better penetration to the bacterial cell membrane while the presence of a high percentage (>50%) of silver ions (i.e., Ag+ nanoreservoirs) on the cluster surface maintains their efficiency in both aerobic and anaerobic conditions. Significantly, the pAgNCs showed a strong capacity to significantly delay the development of bacterial resistance when compared to similar-sized negatively charged silver nanoparticles or conventional antibiotics. This study demonstrates a novel design strategy that can lay the foundation for the development of future highly potent nano-antibiotics effective against a broad spectrum of pathogens and biofilms needed in many everyday life applications and industries.
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Affiliation(s)
- Hanif Haidari
- Clinical & Health Sciences, University of South Australia, Adelaide, SA 5095, Australia
- Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Richard Bright
- Academic Unit of STEM, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Zlatko Kopecki
- Clinical & Health Sciences, University of South Australia, Adelaide, SA 5095, Australia
- Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Peter S Zilm
- Adelaide Dental School, University of Adelaide, Adelaide, SA 5000, Australia
| | - Sanjay Garg
- Clinical & Health Sciences, University of South Australia, Adelaide, SA 5095, Australia
| | - Allison J Cowin
- Clinical & Health Sciences, University of South Australia, Adelaide, SA 5095, Australia
- Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Krasimir Vasilev
- Academic Unit of STEM, University of South Australia, Mawson Lakes, SA 5095, Australia
- Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Nirmal Goswami
- Academic Unit of STEM, University of South Australia, Mawson Lakes, SA 5095, Australia
- Materials Chemistry Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India
- Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201 002, India
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17
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Dong F, Quevedo AC, Wang X, Valsami-Jones E, Kreft JU. Experimental evolution of Pseudomonas putida under silver ion versus nanoparticle stress. Environ Microbiol 2021; 24:905-918. [PMID: 34904333 DOI: 10.1111/1462-2920.15854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 11/13/2021] [Indexed: 11/30/2022]
Abstract
Whether the antibacterial properties of silver nanoparticles (AgNPs) are simply due to the release of silver ions (Ag+ ) or, additionally, nanoparticle-specific effects, is not clear. We used experimental evolution of the model environmental bacterium Pseudomonas putida to ask whether bacteria respond differently to Ag+ or AgNP treatment. We pre-evolved five cultures of strain KT2440 for 70 days without Ag to reduce confounding adaptations before dividing the fittest pre-evolved culture into five cultures each, evolving in the presence of low concentrations of Ag+ , well-defined AgNPs or Ag-free controls for a further 75 days. The mutations in the Ag+ or AgNP evolved populations displayed different patterns that were statistically significant. The non-synonymous mutations in AgNP-treated populations were mostly associated with cell surface proteins, including cytoskeletal membrane protein (FtsZ), membrane sensor and regulator (EnvZ and GacS) and periplasmic protein (PP_2758). In contrast, Ag+ treatment was selected for mutations linked to cytoplasmic proteins, including metal ion transporter (TauB) and those with metal-binding domains (ThiL and PP_2397). These results suggest the existence of AgNP-specific effects, either caused by sustained delivery of Ag+ from AgNP dissolution, more proximate delivery from cell-surface bound AgNPs, or by direct AgNP action on the cell's outer membrane.
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Affiliation(s)
- Feng Dong
- School of Biosciences & Institute of Microbiology and Infection (IMI) & Centre for Computational Biology (CCB), University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Ana C Quevedo
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Xiang Wang
- School of Biosciences & Institute of Microbiology and Infection (IMI) & Centre for Computational Biology (CCB), University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Eugenia Valsami-Jones
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Jan-Ulrich Kreft
- School of Biosciences & Institute of Microbiology and Infection (IMI) & Centre for Computational Biology (CCB), University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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19
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Hajipour MJ, Saei AA, Walker ED, Conley B, Omidi Y, Lee K, Mahmoudi M. Nanotechnology for Targeted Detection and Removal of Bacteria: Opportunities and Challenges. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2100556. [PMID: 34558234 PMCID: PMC8564466 DOI: 10.1002/advs.202100556] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 08/06/2021] [Indexed: 05/04/2023]
Abstract
The emergence of nanotechnology has created unprecedented hopes for addressing several unmet industrial and clinical issues, including the growing threat so-termed "antibiotic resistance" in medicine. Over the last decade, nanotechnologies have demonstrated promising applications in the identification, discrimination, and removal of a wide range of pathogens. Here, recent insights into the field of bacterial nanotechnology are examined that can substantially improve the fundamental understanding of nanoparticle and bacteria interactions. A wide range of developed nanotechnology-based approaches for bacterial detection and removal together with biofilm eradication are summarized. The challenging effects of nanotechnologies on beneficial bacteria in the human body and environment and the mechanisms of bacterial resistance to nanotherapeutics are also reviewed.
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Affiliation(s)
- Mohammad J. Hajipour
- Department of Radiology and Precision Health ProgramMichigan State UniversityEast LansingMI48824USA
| | - Amir Ata Saei
- Division of Physiological Chemistry IDepartment of Medical Biochemistry and BiophysicsKarolinska InstitutetStockholm171 65Sweden
| | - Edward D. Walker
- Department of EntomologyMichigan State UniversityEast LansingMI48824USA
- Department of Microbiology and Molecular GeneticsMichigan State UniversityEast LansingMI48824USA
| | - Brian Conley
- Department of Chemistry and Chemical BiologyRutgersThe State University of New JerseyPiscatawayNJ08854USA
| | - Yadollah Omidi
- Department of Pharmaceutical SciencesCollege of PharmacyNova Southeastern UniversityFort LauderdaleFL33328USA
| | - Ki‐Bum Lee
- Department of Chemistry and Chemical BiologyRutgersThe State University of New JerseyPiscatawayNJ08854USA
| | - Morteza Mahmoudi
- Department of Radiology and Precision Health ProgramMichigan State UniversityEast LansingMI48824USA
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20
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Mann R, Holmes A, McNeilly O, Cavaliere R, Sotiriou GA, Rice SA, Gunawan C. Evolution of biofilm-forming pathogenic bacteria in the presence of nanoparticles and antibiotic: adaptation phenomena and cross-resistance. J Nanobiotechnology 2021; 19:291. [PMID: 34579731 PMCID: PMC8474960 DOI: 10.1186/s12951-021-01027-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 09/06/2021] [Indexed: 11/26/2022] Open
Abstract
Background Treatment of bacterial biofilms are difficult and in many cases, expensive. Bacterial biofilms are naturally more resilient to antimicrobial agents than their free-living planktonic counterparts, rendering the community growth harder to control. The present work described the risks of long-term use of an important alternative antimicrobial, silver nanoparticles (NAg), for the first time, on the dominant mode of bacterial growth. Results NAg could inhibit the formation as well as eradicating an already grown biofilm of Pseudomonas aeruginosa, a pathogen notorious for its resilience to antibiotics. The biofilm-forming bacterium however, evolved a reduced sensitivity to the nanoparticle. Evidence suggests that survival is linked to the development of persister cells within the population. A similar adaptation was also seen upon prolonged exposures to ionic silver (Ag+). The persister population resumed normal growth after subsequent passage in the absence of silver, highlighting the potential risks of recurrent infections with long-term NAg (and Ag+) treatments of biofilm growth. The present study further observed a potential silver/antibiotic cross-resistance, whereby NAg (as well as Ag+) could not eradicate an already growing gentamicin-resistant P. aeruginosa biofilm. The phenomena is thought to result from the hindered biofilm penetration of the silver species. In contrast, both silver formulations inhibited biofilm formation of the resistant strain, presenting a promising avenue for the control of biofilm-forming antibiotic-resistant bacteria. Conclusion The findings signify the importance to study the nanoparticle adaptation phenomena in the biofilm mode of bacterial growth, which are apparently unique to those already reported with the planktonic growth counterparts. This work sets the foundation for future studies in other globally significant bacterial pathogens when present as biofilms. Scientifically based strategies for management of pathogenic growth is necessary, particularly in this era of increasing antibiotic resistance. Graphic abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s12951-021-01027-8.
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Affiliation(s)
- Riti Mann
- The iThree Institute, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Amy Holmes
- School of Pharmacy and Medical Sciences, The University of South Australia, Adelaide, Australia
| | - Oliver McNeilly
- The iThree Institute, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Rosalia Cavaliere
- The iThree Institute, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Georgios A Sotiriou
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Scott A Rice
- The iThree Institute, University of Technology Sydney, Ultimo, NSW, 2007, Australia.,Singapore Centre for Environmental Life Sciences Engineering, Singapore, Singapore.,School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Cindy Gunawan
- The iThree Institute, University of Technology Sydney, Ultimo, NSW, 2007, Australia. .,School of Chemical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia.
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21
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Stabryla LM, Johnston KA, Diemler NA, Cooper VS, Millstone JE, Haig SJ, Gilbertson LM. Role of bacterial motility in differential resistance mechanisms of silver nanoparticles and silver ions. NATURE NANOTECHNOLOGY 2021; 16:996-1003. [PMID: 34155383 DOI: 10.1038/s41565-021-00929-w] [Citation(s) in RCA: 80] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 05/14/2021] [Indexed: 05/27/2023]
Abstract
Unlike conventional antimicrobials, the study of bacterial resistance to silver nanoparticles (AgNPs) remains in its infancy and the mechanism(s) through which it evolves are limited and inconclusive. The central question remains whether bacterial resistance is driven by the AgNPs, released Ag(I) ions or a combination of these and other factors. Here, we show a specific resistance in an Escherichia coli K-12 MG1655 strain to subinhibitory concentrations of AgNPs, and not Ag(I) ions, as indicated by a statistically significant greater-than-twofold increase in the minimum inhibitory concentration occurring after eight repeated passages that was maintained after the AgNPs were removed and reintroduced. Whole-population genome sequencing identified a cusS mutation associated with the heritable resistance that possibly increased silver ion efflux. Finally, we rule out the effect of particle aggregation on resistance and suggest that the mechanism of resistance may be enhanced or mediated by flagellum-based motility.
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Affiliation(s)
- Lisa M Stabryla
- Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA, USA.
| | | | - Nathan A Diemler
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Vaughn S Cooper
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Jill E Millstone
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, USA
| | - Sarah-Jane Haig
- Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Environmental and Occupational Health, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Leanne M Gilbertson
- Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA, USA.
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA, USA.
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22
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Mehmood T, Lu J, Liu C, Gaurav GK. Organics removal and microbial interaction attributes of zeolite and ceramsite assisted bioretention system in copper-contaminated stormwater treatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 292:112654. [PMID: 33971541 DOI: 10.1016/j.jenvman.2021.112654] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 04/06/2021] [Accepted: 04/14/2021] [Indexed: 06/12/2023]
Abstract
Bioretention has been increasingly used recently to treat heavy metals contaminated stormwater. However, less is known about how metal accumulation influences microbial performance and organics removal mechanisms in different layers of the bioretention system. Two lab-scale bioretention columns (i.e., control and Cu treatment) were designed and filled with soil and fillers (zeolite and ceramsite). The results obtained from the time-series experiment of 121 days showed that the removal of organics markedly affected by Cu accumulation and microbial activities, varied between soil and filler layers of bioretention system. The overall organics removal rate was higher in filler than soil. However, at the individual level, the chemical oxygen demand (COD) removal rate was higher than total organic carbon (TOC) in the soil, while the opposite trend was observed in fillers. Mixed media (soil + fillers) significantly reduced the bio-available and labile fractions of Cu from 33.5 to 8% and 67.5 to 33.4%, respectively. The bioretention column treated with Cu lost 14% more microbial biomass in soil than filler over the 121 days study period. Therefore mixed media in bioretention system can offset the substantial negative impacts of long-term metal accumulation on pollutant removal and microbial degradation function in the bioretention. The present study advanced our understanding to resolve the complex metals-impacted microbial pollutant biodegradation mechanisms and highlight importance of mixed media in the long-term maintenance of the bioretention system, which is imperative for developing effective and stormwater-specific remediation strategies.
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Affiliation(s)
- Tariq Mehmood
- College of Environment, Hohai University, 210098, PR China
| | - Jie Lu
- College of Environment, Hohai University, 210098, PR China
| | - Cheng Liu
- College of Environment, Hohai University, 210098, PR China; Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing, 210098, PR China.
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23
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Bruna T, Maldonado-Bravo F, Jara P, Caro N. Silver Nanoparticles and Their Antibacterial Applications. Int J Mol Sci 2021; 22:7202. [PMID: 34281254 PMCID: PMC8268496 DOI: 10.3390/ijms22137202] [Citation(s) in RCA: 369] [Impact Index Per Article: 123.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 07/02/2021] [Accepted: 07/02/2021] [Indexed: 12/22/2022] Open
Abstract
Silver nanoparticles (AgNPs) have been imposed as an excellent antimicrobial agent being able to combat bacteria in vitro and in vivo causing infections. The antibacterial capacity of AgNPs covers Gram-negative and Gram-positive bacteria, including multidrug resistant strains. AgNPs exhibit multiple and simultaneous mechanisms of action and in combination with antibacterial agents as organic compounds or antibiotics it has shown synergistic effect against pathogens bacteria such as Escherichia coli and Staphylococcus aureus. The characteristics of silver nanoparticles make them suitable for their application in medical and healthcare products where they may treat infections or prevent them efficiently. With the urgent need for new efficient antibacterial agents, this review aims to establish factors affecting antibacterial and cytotoxic effects of silver nanoparticles, as well as to expose the advantages of using AgNPs as new antibacterial agents in combination with antibiotic, which will reduce the dosage needed and prevent secondary effects associated to both.
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Affiliation(s)
- Tamara Bruna
- Centro de Investigación Austral Biotech, Facultad de Ciencias, Universidad Santo Tomás, Avenida Ejército 146, Santiago 8320000, Chile;
| | - Francisca Maldonado-Bravo
- Centro de Investigación Austral Biotech, Facultad de Ciencias, Universidad Santo Tomás, Avenida Ejército 146, Santiago 8320000, Chile;
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago 7800003, Chile;
| | - Paul Jara
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago 7800003, Chile;
| | - Nelson Caro
- Centro de Investigación Austral Biotech, Facultad de Ciencias, Universidad Santo Tomás, Avenida Ejército 146, Santiago 8320000, Chile;
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Staroń A, Długosz O. Antimicrobial properties of nanoparticles in the context of advantages and potential risks of their use. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2021; 56:680-693. [PMID: 33979267 DOI: 10.1080/10934529.2021.1917936] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 04/09/2021] [Accepted: 04/10/2021] [Indexed: 06/12/2023]
Abstract
The popularity of nanotechnology results from the possibility of obtaining materials that have better chemical, electrical, thermal, mechanical, or optical properties. Nano-sized materials are characterized by an increased surface area, which improves their chemical reactivity and mobility. Due to their enhanced reactivity and appropriately small size, some nanoparticles are used as antimicrobial and antifungal agents. Nanoparticles exhibit antimicrobial potential through multifaceted mechanisms. The adhesion of nanoparticles to microbial cells, and reactive oxygen species, and their penetration inside the cells, have been recognized as the most prominent modes of antimicrobial action. This review presents the mechanism of action of nanometals and oxide nanoparticles used as antimicrobials and the mechanisms of bacterial resistance to the toxic effects of nanoparticles. The article presents methods of forming microorganism resistance to the toxic effects of nanoparticles and the negative impact of nanoparticles on human health.
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Affiliation(s)
- Anita Staroń
- Department of Engineering and Chemical Technology, Cracow University of Technology, Cracow, Poland
| | - Olga Długosz
- Department of Engineering and Chemical Technology, Cracow University of Technology, Cracow, Poland
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Monedeiro F, Railean-Plugaru V, Monedeiro-Milanowski M, Pomastowski P, Buszewski B. Metabolic Profiling of VOCs Emitted by Bacteria Isolated from Pressure Ulcers and Treated with Different Concentrations of Bio-AgNPs. Int J Mol Sci 2021; 22:4696. [PMID: 33946710 PMCID: PMC8124631 DOI: 10.3390/ijms22094696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 04/22/2021] [Accepted: 04/27/2021] [Indexed: 12/30/2022] Open
Abstract
Considering the advent of antibiotic resistance, the study of bacterial metabolic behavior stimulated by novel antimicrobial agents becomes a relevant tool to elucidate involved adaptive pathways. Profiling of volatile metabolites was performed to monitor alterations of bacterial metabolism induced by biosynthesized silver nanoparticles (bio-AgNPs). Escherichia coli, Enterococcus faecalis, Klebsiella pneumoniae and Proteus mirabilis were isolated from pressure ulcers, and their cultures were prepared in the presence/absence of bio-AgNPs at 12.5, 25 and 50 µg mL-1. Headspace solid phase microextraction associated to gas chromatography-mass spectrometry was the employed analytical platform. At the lower concentration level, the agent promoted positive modulation of products of fermentation routes and bioactive volatiles, indicating an attempt of bacteria to adapt to an ongoing suppression of cellular respiration. Augmented response of aldehydes and other possible products of lipid oxidative cleavage was noticed for increasing levels of bio-AgNPs. The greatest concentration of agent caused a reduction of 44 to 80% in the variety of compounds found in the control samples. Pathway analysis indicated overall inhibition of amino acids and fatty acids routes. The present assessment may provide a deeper understanding of molecular mechanisms of bio-AgNPs and how the metabolic response of bacteria is untangled.
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Affiliation(s)
- Fernanda Monedeiro
- Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University in Toruń, 4 Wileńska St., 87-100 Toruń, Poland; (F.M.); (V.R.-P.); (M.M.-M.); (P.P.)
| | - Viorica Railean-Plugaru
- Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University in Toruń, 4 Wileńska St., 87-100 Toruń, Poland; (F.M.); (V.R.-P.); (M.M.-M.); (P.P.)
| | - Maciej Monedeiro-Milanowski
- Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University in Toruń, 4 Wileńska St., 87-100 Toruń, Poland; (F.M.); (V.R.-P.); (M.M.-M.); (P.P.)
| | - Paweł Pomastowski
- Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University in Toruń, 4 Wileńska St., 87-100 Toruń, Poland; (F.M.); (V.R.-P.); (M.M.-M.); (P.P.)
| | - Bogusław Buszewski
- Interdisciplinary Centre of Modern Technologies, Nicolaus Copernicus University in Toruń, 4 Wileńska St., 87-100 Toruń, Poland; (F.M.); (V.R.-P.); (M.M.-M.); (P.P.)
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarina St., 87-100 Toruń, Poland
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McNeilly O, Mann R, Hamidian M, Gunawan C. Emerging Concern for Silver Nanoparticle Resistance in Acinetobacter baumannii and Other Bacteria. Front Microbiol 2021; 12:652863. [PMID: 33936010 PMCID: PMC8085274 DOI: 10.3389/fmicb.2021.652863] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 03/29/2021] [Indexed: 12/12/2022] Open
Abstract
The misuse of antibiotics combined with a lack of newly developed ones is the main contributors to the current antibiotic resistance crisis. There is a dire need for new and alternative antibacterial options and nanotechnology could be a solution. Metal-based nanoparticles, particularly silver nanoparticles (NAg), have garnered widespread popularity due to their unique physicochemical properties and broad-spectrum antibacterial activity. Consequently, NAg has seen extensive incorporation in many types of products across the healthcare and consumer market. Despite clear evidence of the strong antibacterial efficacy of NAg, studies have raised concerns over the development of silver-resistant bacteria. Resistance to cationic silver (Ag+) has been recognised for many years, but it has recently been found that bacterial resistance to NAg is also possible. It is also understood that exposure of bacteria to toxic heavy metals like silver can induce the emergence of antibiotic resistance through the process of co-selection. Acinetobacter baumannii is a Gram-negative coccobacillus and opportunistic nosocomial bacterial pathogen. It was recently listed as the "number one" critical level priority pathogen because of the significant rise of antibiotic resistance in this species. NAg has proven bactericidal activity towards A. baumannii, even against strains that display multi-drug resistance. However, despite ample evidence of heavy metal (including silver; Ag+) resistance in this bacterium, combined with reports of heavy metal-driven co-selection of antibiotic resistance, little research has been dedicated to assessing the potential for NAg resistance development in A. baumannii. This is worrisome, as the increasingly indiscriminate use of NAg could promote the development of silver resistance in this species, like what has occurred with antibiotics.
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Affiliation(s)
- Oliver McNeilly
- iThree Institute, University of Technology Sydney, Ultimo, NSW, Australia
| | - Riti Mann
- iThree Institute, University of Technology Sydney, Ultimo, NSW, Australia
| | - Mohammad Hamidian
- iThree Institute, University of Technology Sydney, Ultimo, NSW, Australia
| | - Cindy Gunawan
- iThree Institute, University of Technology Sydney, Ultimo, NSW, Australia
- School of Chemical Engineering, University of New South Wales, Sydney, NSW, Australia
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Guo Z, Chen Y, Wang Y, Jiang H, Wang X. Advances and challenges in metallic nanomaterial synthesis and antibacterial applications. J Mater Chem B 2021; 8:4764-4777. [PMID: 32207511 DOI: 10.1039/d0tb00099j] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Multi-drug resistant bacterial infection has become one of the most serious threats to global public health. The preparation and application of new antibacterial materials are of great significance for solving the infection problem of bacteria, especially multi-drug resistant bacteria. The exceptional antibacterial effects of metal nanoparticles based on their unique physical and chemical properties make such systems ideal for application as antibacterial drug carriers or self-modified therapeutic agents both in vitro and in vivo. Metal nanoparticles also have admirable clinical application prospects due to their broad antibacterial spectrum, various antibacterial mechanisms and excellent biocompatibility. Nevertheless, the in vivo structural stability, long-term safety and cytotoxicity of the surface modification of metal nanoparticles have yet to be further explored and improved in subsequent studies. Herein, we summarized the research progress concerning the mechanism of metal nanomaterials in terms of antibacterial activity together with the preparation of metal nanostructures. Based on these observations, we also give a brief discussion on the current problems and future developments of metal nanoparticles for antibacterial applications.
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Affiliation(s)
- Zengchao Guo
- State Key Laboratory of Bioelectronics (Chien-Shiung Wu Lab), School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
| | - Yun Chen
- State Key Laboratory of Bioelectronics (Chien-Shiung Wu Lab), School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
| | - Yihan Wang
- State Key Laboratory of Bioelectronics (Chien-Shiung Wu Lab), School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
| | - Hui Jiang
- State Key Laboratory of Bioelectronics (Chien-Shiung Wu Lab), School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
| | - Xuemei Wang
- State Key Laboratory of Bioelectronics (Chien-Shiung Wu Lab), School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
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Amaro F, Morón Á, Díaz S, Martín-González A, Gutiérrez JC. Metallic Nanoparticles-Friends or Foes in the Battle against Antibiotic-Resistant Bacteria? Microorganisms 2021; 9:364. [PMID: 33673231 PMCID: PMC7917771 DOI: 10.3390/microorganisms9020364] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 02/08/2021] [Accepted: 02/10/2021] [Indexed: 12/15/2022] Open
Abstract
The rapid spread of antibiotic resistances among bacteria demands novel strategies for infection control, and metallic nanoparticles appear as promising tools because of their unique size and tunable properties that allow their antibacterial effects to be maximized. Furthermore, their diverse mechanisms of action towards multiple cell components have suggested that bacteria could not easily develop resistance against nanoparticles. However, research published over the last decade has proven that bacteria can indeed evolve stable resistance mechanisms upon continuous exposure to metallic nanoparticles. In this review, we summarize the currently known individual and collective strategies employed by bacteria to cope with metallic nanoparticles. Importantly, we also discuss the adverse side effects that bacterial exposure to nanoparticles may have on antibiotic resistance dissemination and that might constitute a challenge for the implementation of nanoparticles as antibacterial agents. Overall, studies discussed in this review point out that careful management of these very promising antimicrobials is necessary to preserve their efficacy for infection control.
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Affiliation(s)
- Francisco Amaro
- Department of Genetics, Physiology and Microbiology, Faculty of Biology, Complutense University of Madrid, 28040 Madrid, Spain; (Á.M.); (S.D.); (A.M.-G.); (J.C.G.)
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Wang M, Yu H, Li X, Shen Z. Single-gene regulated non-spore-forming Bacillus subtilis: Construction, transcriptome responses, and applications for producing enzymes and surfactin. Metab Eng 2020; 62:235-248. [DOI: 10.1016/j.ymben.2020.08.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 08/12/2020] [Accepted: 08/12/2020] [Indexed: 01/01/2023]
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Amin Yavari S, Castenmiller SM, van Strijp JAG, Croes M. Combating Implant Infections: Shifting Focus from Bacteria to Host. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2002962. [PMID: 32914481 DOI: 10.1002/adma.202002962] [Citation(s) in RCA: 76] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/28/2020] [Indexed: 05/06/2023]
Abstract
The widespread use of biomaterials to support or replace body parts is increasingly threatened by the risk of implant-associated infections. In the quest for finding novel anti-infective biomaterials, there generally has been a one-sided focus on biomaterials with direct antibacterial properties, which leads to excessive use of antibacterial agents, compromised host responses, and unpredictable effectiveness in vivo. This review sheds light on how host immunomodulation, rather than only targeting bacteria, can endow biomaterials with improved anti-infective properties. How antibacterial surface treatments are at risk to be undermined by biomaterial features that dysregulate the protection normally provided by critical immune cell subsets, namely, neutrophils and macrophages, is discussed. Accordingly, how the precise modification of biomaterial surface biophysical cues, or the incorporation of immunomodulatory drug delivery systems, can render biomaterials with the necessary immune-compatible and immune-protective properties to potentiate the host defense mechanisms is reviewed. Within this context, the protective role of host defense peptides, metallic particles, quorum sensing inhibitors, and therapeutic adjuvants is discussed. The highlighted immunomodulatory strategies may lay a foundation to develop anti-infective biomaterials, while mitigating the increasing threat of antibacterial drug resistance.
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Affiliation(s)
- Saber Amin Yavari
- Department of Orthopedics, University Medical Center Utrecht, Utrecht, 3508GA, The Netherlands
| | - Suzanne M Castenmiller
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, 3508GA, The Netherlands
| | - Jos A G van Strijp
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, 3508GA, The Netherlands
| | - Michiel Croes
- Department of Orthopedics, University Medical Center Utrecht, Utrecht, 3508GA, The Netherlands
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Jaros J, Wilson C, Shi VY. Fabric Selection in Atopic Dermatitis: An Evidence-Based Review. Am J Clin Dermatol 2020; 21:467-482. [PMID: 32440827 DOI: 10.1007/s40257-020-00516-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
BACKGROUND Clothing fabrics interact closely with the skin to shape our cutaneous microenvironment. Cotton and silk have been traditionally recommended for patients with atopic dermatitis because of reported patient comfort. New synthetic fabrics combine anti-microbial, anti-inflammatory, moisture-wicking, and soothing properties that may augment conventional management strategies in atopic patients. OBJECTIVE We review existing and emerging evidence for fabric selection in patients with atopic dermatitis including cotton, wool, lyocell, silk, anionic, cellulosic/cellulose based, zinc oxide coated, citric acid coated, chitosan coated, silver coated, borage seed oil coated, ethylene vinyl, and polyurethane and offer practical suggestions for clothing and bedding choices. METHODS A systematic search was conducted on PubMed and EMBASE electronic databases for articles from 1 January, 1994 to 1 January, 2020. Studies were included based on the following inclusion criteria: clinical trial, published in English, and fabric as the main agent being evaluated. Case reports, case series, conference abstracts, reviews, animal studies, and duplicates were excluded. Studies were then manually screened by title, abstract, and full-text articles and selected to specifically describe the effects of fabrics in patients with atopic dermatitis. Both adult and pediatric patient studies were included. RESULTS There appears to be an advantage to modern fabric manufacturing and processing techniques that have created smaller diameter, smoother fibers such as super- and ultrafine merino wool and anti-microbial finishes. Traditional cotton and silk fabrics have mixed evidence in improving atopic dermatitis symptoms and severity but have shown to be generally safe. Large-diameter wool has been shown to induce itching and irritation; ultra- or superfine merino wool is non-pruritic and may be recommended as an alternative. Emerging fabrics with potential efficacy in reducing atopic dermatitis severity and Staphylococcus aureus burden include silver-coated, chitosan-coated, and cellulose-based fabrics. Zinc oxide-coated, acid-coated, polyurethane-coated, borage seed oil-coated, anionic, lyocell, and ethylene vinyl fabrics have sparse evidence and require further study before conclusions can be made. CONCLUSIONS Appropriate fabric selection can reduce the symptom severity and exacerbations of atopic dermatitis.
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Affiliation(s)
- Joanna Jaros
- University of Illinois College of Medicine, 808 S. Wood St. - 380 CME, Chicago, IL, 60612-7307, USA
| | - Claire Wilson
- University of Illinois College of Medicine, 808 S. Wood St. - 380 CME, Chicago, IL, 60612-7307, USA
| | - Vivian Y Shi
- Eczema and Skin Barrier Research Program, Dermatology Division, Department of Medicine, University of Arizona, 7165 N Pima Canyon Drive, Tucson, AZ, 85718, USA.
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Kim JH, Mun C, Ma J, Park SG, Lee S, Kim CS. Simple Fabrication of Transparent, Colorless, and Self-Disinfecting Polyethylene Terephthalate Film via Cold Plasma Treatment. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E949. [PMID: 32429311 PMCID: PMC7279332 DOI: 10.3390/nano10050949] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 05/09/2020] [Accepted: 05/12/2020] [Indexed: 12/17/2022]
Abstract
Cross-infection following cross-contamination is a serious social issue worldwide. Pathogens are normally spread by contact with germ-contaminated surfaces. Accordingly, antibacterial surface technologies are urgently needed and have consequently been actively developed in recent years. Among these technologies, biomimetic nanopatterned surfaces that physically kill adhering bacteria have attracted attraction as an effective technological solution to replace toxic chemical disinfectants (biocides). Herein, we introduce a transparent, colorless, and self-disinfecting polyethylene terephthalate (PET) film that mimics the surface structure of the Progomphus obscurus (sanddragon) wing physically killing the attached bacteria. The PET film was partially etched via a 4-min carbon tetrafluoride (CF4) plasma treatment. Compared to a flat bare PET film, the plasma-treated film surface exhibited a uniform array structure composed of nanopillars with a 30 nm diameter, 237 nm height, and 75 nm pitch. The plasma-treated PET film showed improvements in optical properties (transmittance and B*) and antibacterial effectiveness over the bare film; the transparency and colorlessness slightly increased, and the antibacterial activity increased from 53.8 to 100% for Staphylococcus aureus, and from 0 to 100% for Escherichia coli. These results demonstrated the feasibility of the CF4 plasma-treated PET film as a potential antibacterial overcoating with good optical properties.
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Affiliation(s)
- Ji-Hyeon Kim
- Advanced Nano-Surface Department, Korea Institute of Materials Science, Changwon 51508, Korea; (J.-H.K.); (C.M.); (J.M.); (S.-G.P.); (S.L.)
| | - ChaeWon Mun
- Advanced Nano-Surface Department, Korea Institute of Materials Science, Changwon 51508, Korea; (J.-H.K.); (C.M.); (J.M.); (S.-G.P.); (S.L.)
| | - Junfei Ma
- Advanced Nano-Surface Department, Korea Institute of Materials Science, Changwon 51508, Korea; (J.-H.K.); (C.M.); (J.M.); (S.-G.P.); (S.L.)
- School of Architectural, Civil, Environmental, and Energy Engineering, Kyungpook National University, Daegu 41566, Korea
| | - Sung-Gyu Park
- Advanced Nano-Surface Department, Korea Institute of Materials Science, Changwon 51508, Korea; (J.-H.K.); (C.M.); (J.M.); (S.-G.P.); (S.L.)
| | - Seunghun Lee
- Advanced Nano-Surface Department, Korea Institute of Materials Science, Changwon 51508, Korea; (J.-H.K.); (C.M.); (J.M.); (S.-G.P.); (S.L.)
| | - Chang Su Kim
- Advanced Nano-Surface Department, Korea Institute of Materials Science, Changwon 51508, Korea; (J.-H.K.); (C.M.); (J.M.); (S.-G.P.); (S.L.)
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Gunawan C, Faiz MB, Mann R, Ting SRS, Sotiriou GA, Marquis CP, Amal R. Nanosilver Targets the Bacterial Cell Envelope: The Link with Generation of Reactive Oxygen Radicals. ACS APPLIED MATERIALS & INTERFACES 2020; 12:5557-5568. [PMID: 31927911 DOI: 10.1021/acsami.9b20193] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The work describes the interactions of nanosilver (NAg) with bacterial cell envelope components at a molecular level and how this associates with the reactive oxygen species (ROS)-mediated toxicity of the nanoparticle. Major structural changes were detected in cell envelope biomolecules as a result of damages in functional moieties, such as the saccharides, amides, and phosphodiesters. NAg exposure disintegrates the glycan backbone in the major cell wall component peptidoglycan, causes complete breakdown of lipoteichoic acid, and disrupts the phosphate-amine and fatty acid groups in phosphatidylethanolamine, a membrane phospholipid. Consistent with the oxidative attacks, we propose that the observed cell envelope damages are inflicted, at least in part, by the reactive oxygen radicals being generated by the nanoparticle during its leaching process, abiotically, without cells. The cell envelope targeting, especially those on the inner membrane phospholipid, is likely to then trigger the rapid generation of lethal levels of cellular superoxide (O2•-) and hydroxyl (OH•) radicals herein seen with a model bacterium. The present study provides a better understanding of the antibacterial mechanisms of NAg, whereby ROS generation could be both the cause and consequence of the toxicity, associated with the initial cell envelope targeting by the nanoparticle.
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Affiliation(s)
- Cindy Gunawan
- ithree institute , University of Technology Sydney , Sydney , NSW 2007 , Australia
- School of Chemical Engineering , University of New South Wales , Sydney , NSW 2052 , Australia
| | - Merisa B Faiz
- School of Chemical Engineering , University of New South Wales , Sydney , NSW 2052 , Australia
| | - Riti Mann
- ithree institute , University of Technology Sydney , Sydney , NSW 2007 , Australia
| | - Simon R S Ting
- Centre for Health Technologies , University of Technology Sydney , Sydney NSW 2007 , Australia
| | - Georgios A Sotiriou
- Department of Microbiology, Tumor and Cell Biology , Karolinska Institutet , Solna, Stockholm 171 77 , Sweden
| | - Christopher P Marquis
- School of Biotechnology and Biomolecular Sciences , University of New South Wales , Sydney , NSW 2052 , Australia
| | - Rose Amal
- School of Chemical Engineering , University of New South Wales , Sydney , NSW 2052 , Australia
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Tyagi N, Kumar A. Understanding effect of interaction of nanoparticles and antibiotics on bacteria survival under aquatic conditions: Knowns and unknowns. ENVIRONMENTAL RESEARCH 2020; 181:108945. [PMID: 31806288 DOI: 10.1016/j.envres.2019.108945] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 10/22/2019] [Accepted: 11/17/2019] [Indexed: 06/10/2023]
Abstract
The review provides a comprehensive overview of the available state-of-the-art of nanoparticles (NPs) and antibiotics (ABs) occurrence and their fate in the natural aquatic settings by addressing different research questions and the challenges faced while addressing those questions. Firstly, understand the interaction of NPs and ABs with themselves in addition to other matrix components (presence of natural organic matter, bacteria, biofilms, other anthropogenic pollutants and metals from natural sources). Secondly, summarize the bactericidal activity of NP and AB due to reactive oxygen species (ROS) production. The complete information was gathered from database and analysed as per the conjectured questions under laboratory versus environmental-relevant conditions (1. Fate of NPs and ABs, and 2. Will the presence of NPs and ABs alone and their mixtures influence the ROS concentration and antibacterial activity), and proposed six reactions to describe the fate of NP and AB in natural aquatic settings. However, laboratory-based studies revealed that NP and AB fate largely depend on the ionic strength, organic matter content and pH of the matrix whereas field based information is missing about this. The former was performed at sterile conditions using sophisticated instruments and standard protocol as compared to latter and can't be replicated under natural aquatic settings due to lack of: (i) accurate environmental concentration of NPs and ABs, (ii) knowledge of bacterial type and their concentration, (iii) optimized protocol and tracking systems. The author's recommendation is to verify the proposed reactions experimentally by using the frequently found pairs of NPs and ABs in the natural aquatic settings. Further, ranked them on their decreasing order of toxicity and informed regulatory bodies for further action. Overall research is needed in the suggested directions to reduce uncertainty behind the impacts of NPs and ABs on the aquatic settings and their role in bactericidal activity.
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Affiliation(s)
- Neha Tyagi
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India.
| | - Arun Kumar
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India.
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Valentin E, Bottomley AL, Chilambi GS, Harry EJ, Amal R, Sotiriou GA, Rice SA, Gunawan C. Heritable nanosilver resistance in priority pathogen: a unique genetic adaptation and comparison with ionic silver and antibiotics. NANOSCALE 2020; 12:2384-2392. [PMID: 31930233 DOI: 10.1039/c9nr08424j] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The past decade has seen the incorporation of antimicrobial nanosilver (NAg) into medical devices, and, increasingly, in everyday 'antibacterial' products. With the continued rise of antibiotic resistant bacteria, there are concerns that these priority pathogens will also develop resistance to the extensively commercialized nanoparticle antimicrobials. Herein, this work reports the emergence of stable resistance traits to NAg in the WHO-listed priority pathogen Staphylococcus aureus, which has previously been suggested to have no, or very low, capacity for silver resistance. With no native presence of genetically encoded silver defence mechanisms, the work showed that the bacterium is dependent on mutation of physiologically essential genes, including those involved in nucleotide synthesis and oxidative stress defence. While some mutations were uniquely associated with resistance to NAg, the study also found common mutations that could be protective against both NAg and ionic silver. This is consistent with the observation of NAg/ionic silver cross-resistance. These mutations were detected following withdrawal of the silver exposure, denoting heritable characteristics that allow for spread of the resistance traits even with discontinued silver use. Heritable silver resistance in priority pathogen cautions that these nanoparticle antimicrobials should only be used as needed, to preserve their efficacy for treating infections.
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Affiliation(s)
| | - Amy L Bottomley
- Ithree institute, University of Technology Sydney, NSW 2007, Australia.
| | | | - Elizabeth J Harry
- Ithree institute, University of Technology Sydney, NSW 2007, Australia.
| | - Rose Amal
- School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Georgios A Sotiriou
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Scott A Rice
- Ithree institute, University of Technology Sydney, NSW 2007, Australia. and Singapore Centre for Environmental Life Sciences Engineering, Singapore and School of Biological Sciences, Nanyang Technological University, Singapore
| | - Cindy Gunawan
- Ithree institute, University of Technology Sydney, NSW 2007, Australia. and School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
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Kalantari K, Mostafavi E, Afifi AM, Izadiyan Z, Jahangirian H, Rafiee-Moghaddam R, Webster TJ. Wound dressings functionalized with silver nanoparticles: promises and pitfalls. NANOSCALE 2020; 12:2268-2291. [PMID: 31942896 DOI: 10.1039/c9nr08234d] [Citation(s) in RCA: 167] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Infections are the main reason why most people die from burns and diabetic wounds. The clinical challenge for treating wound infections through traditional antibiotics has been growing steadily and has now reached a critical status requiring a paradigm shift for improved chronic wound care. The US Centers for Disease Control have predicted more deaths from antimicrobial-resistant bacteria than from all types of cancers combined by 2050. Thus, the development of new wound dressing materials that do not rely on antibiotics is of paramount importance. Currently, incorporating nanoparticles into scaffolds represents a new concept of 'nanoparticle dressing' which has gained considerable attention for wound healing. Silver nanoparticles (Ag-NPs) have been categorized as metal-based nanoparticles and are intriguing materials for wound healing because of their excellent antimicrobial properties. Ag-NPs embedded in wound dressing polymers promote wound healing and control microorganism growth. However, there have been several recent disadvantages of using Ag-NPs to fight infections, such as bacterial resistance. This review highlights the therapeutic approaches of using wound dressings functionalized with Ag-NPs and their potential role in revolutionizing wound healing. Moreover, the physiology of the skin and wounds is discussed to place the use of Ag-NPs in wound care into perspective.
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Affiliation(s)
- Katayoon Kalantari
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA. and Centre of Advanced Materials (CAM), Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Ebrahim Mostafavi
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA.
| | - Amalina M Afifi
- Centre of Advanced Materials (CAM), Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Zahra Izadiyan
- Department of Environment and Green Technology, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, 54100 Kuala Lumpur, Malaysia
| | - Hossein Jahangirian
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA.
| | | | - Thomas J Webster
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA.
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Mitchell SL, Hudson-Smith NV, Cahill MS, Reynolds BN, Frand SD, Green CM, Wang C, Hang MN, Hernandez RT, Hamers RJ, Feng ZV, Haynes CL, Carlson EE. Chronic exposure to complex metal oxide nanoparticles elicits rapid resistance in Shewanella oneidensis MR-1. Chem Sci 2019; 10:9768-9781. [PMID: 32055346 PMCID: PMC6993611 DOI: 10.1039/c9sc01942a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Accepted: 08/29/2019] [Indexed: 12/20/2022] Open
Abstract
Engineered nanoparticles are incorporated into numerous emerging technologies because of their unique physical and chemical properties. Many of these properties facilitate novel interactions, including both intentional and accidental effects on biological systems. Silver-containing particles are widely used as antimicrobial agents and recent evidence indicates that bacteria rapidly become resistant to these nanoparticles. Much less studied is the chronic exposure of bacteria to particles that were not designed to interact with microorganisms. For example, previous work has demonstrated that the lithium intercalated battery cathode nanosheet, nickel manganese cobalt oxide (NMC), is cytotoxic and causes a significant delay in growth of Shewanella oneidensis MR-1 upon acute exposure. Here, we report that S. oneidensis MR-1 rapidly adapts to chronic NMC exposure and is subsequently able to survive in much higher concentrations of these particles, providing the first evidence of permanent bacterial resistance following exposure to nanoparticles that were not intended as antibacterial agents. We also found that when NMC-adapted bacteria were subjected to only the metal ions released from this material, their specific growth rates were higher than when exposed to the nanoparticle. As such, we provide here the first demonstration of bacterial resistance to complex metal oxide nanoparticles with an adaptation mechanism that cannot be fully explained by multi-metal adaptation. Importantly, this adaptation persists even after the organism has been grown in pristine media for multiple generations, indicating that S. oneidensis MR-1 has developed permanent resistance to NMC.
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Affiliation(s)
- Stephanie L Mitchell
- Department of Chemistry , University of Minnesota , 207 Pleasant St. SE , Minneapolis , MN 55455 , USA .
| | - Natalie V Hudson-Smith
- Department of Chemistry , University of Minnesota , 207 Pleasant St. SE , Minneapolis , MN 55455 , USA .
| | - Meghan S Cahill
- Department of Chemistry , University of Minnesota , 207 Pleasant St. SE , Minneapolis , MN 55455 , USA .
| | - Benjamin N Reynolds
- Department of Biochemistry, Molecular Biology, and Biophysics , University of Minnesota , 321 Church Street SE , Minneapolis , Minnesota 55454 , USA
| | - Seth D Frand
- Chemistry Department , Augsburg University , 2211 Riverside Ave , Minneapolis , MN 55454 , USA
| | - Curtis M Green
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , WI 53706 , USA
| | - Chenyu Wang
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , WI 53706 , USA
| | - Mimi N Hang
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , WI 53706 , USA
| | - Rodrigo Tapia Hernandez
- Chemistry Department , Augsburg University , 2211 Riverside Ave , Minneapolis , MN 55454 , USA
| | - Robert J Hamers
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , WI 53706 , USA
| | - Z Vivian Feng
- Chemistry Department , Augsburg University , 2211 Riverside Ave , Minneapolis , MN 55454 , USA
| | - Christy L Haynes
- Department of Chemistry , University of Minnesota , 207 Pleasant St. SE , Minneapolis , MN 55455 , USA .
| | - Erin E Carlson
- Department of Chemistry , University of Minnesota , 207 Pleasant St. SE , Minneapolis , MN 55455 , USA .
- Department of Biochemistry, Molecular Biology, and Biophysics , University of Minnesota , 321 Church Street SE , Minneapolis , Minnesota 55454 , USA
- Department of Medicinal Chemistry , University of Minnesota , 208 Harvard Street SE , Minneapolis , 55454 , USA
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Wu S, Wu H, Button M, Konnerup D, Brix H. Impact of engineered nanoparticles on microbial transformations of carbon, nitrogen, and phosphorus in wastewater treatment processes - A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 660:1144-1154. [PMID: 30743910 DOI: 10.1016/j.scitotenv.2019.01.106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 01/07/2019] [Accepted: 01/10/2019] [Indexed: 06/09/2023]
Abstract
Concern regarding the potential negative impacts of released engineered nanoparticles (ENPs) on pollutant removal performance of wastewater treatment systems has received booming attention in recent years. However, the conclusions drawn from different studies often lead to fragmented overall knowledge, some of which are even contradictory. This scenario shows the necessity for a comprehensive review of the interactions of ENPs in wastewater treatment systems, particularly on the impacts of ENPs on microbial processes of carbon (C), nitrogen (N), and phosphorus (P) removal in water treatment systems. This review introduced the impact of 6 often reported ENPs in 5 types of treatment systems. We found that exposure to most of the investigated ENPs at low concentrations doesn't adversely influence the growth of the heterotrophic microbes, which are responsible for organic matter removal. The impacts of ENPs on various microbial nitrogen transformation processes have been investigated. Dosing of ENPs often causes acute microbial nitrogen removal inhibition at various concentrations, but does not influence long-term operation due to microbial adaption. No significant negative effects on biological phosphorus removal in different wastewater treatment processes have been reported after both short-term and long-term exposure (except copper nanoparticles). Environmentally relevant concentrations of ENPs have been reported to enhance the photosynthetic capacity of wetland plants, whereas chronic inhibition to photosynthesis was found in exposure to high concentrations of ENPs. Inhibition effects are often overestimated in pure cultivated toxicity test assays compared to testing with artificially prepared wastewater containing various ingredients or with real wastewater. Potential ligands in real wastewater can bind with ENPs and lower their dissolution. Some challenges exist regarding detection and quantification techniques of ENPs at environmental concentrations, modeling of engineered nanomaterial release on a worldwide scale, and inhibitory mechanisms to microbial transformations.
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Affiliation(s)
- Shubiao Wu
- Aarhus Institute of Advanced Studies, Aarhus University, Aarhus 8000C, Denmark; Department of Bioscience, Aarhus University, Aarhus 8000C, Denmark.
| | - Haiming Wu
- College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Mark Button
- Department of Earth and Environmental Sciences, University of British Columbia - Okanagan, Kelowna, British Columbia, Canada
| | - Dennis Konnerup
- Aarhus Institute of Advanced Studies, Aarhus University, Aarhus 8000C, Denmark; Department of Bioscience, Aarhus University, Aarhus 8000C, Denmark
| | - Hans Brix
- Department of Bioscience, Aarhus University, Aarhus 8000C, Denmark
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Yamada M, Minoura K, Mizoguchi T, Nakamatsu K, Taguchi T, Kameda T, Sekiguchi M, Suzutani T, Konno S. Antibacterial effects of nano-imprinted moth-eye film in practical settings. PLoS One 2018; 13:e0198300. [PMID: 30281619 PMCID: PMC6169843 DOI: 10.1371/journal.pone.0198300] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 09/07/2018] [Indexed: 01/29/2023] Open
Abstract
BACKGROUND Recent studies report that surfaces displaying micrometer- or nanometer-sized undulating structures exhibit antibacterial effects. In previous work, we described the use of an advanced nanofabrication technique to generate an artificial biomimetic Moth-eye film by coating a polyethylene terephthalate (PET) film with nanoscale moth-eye protrusions made from a hydrophilic resin. This moth-eye film exhibited enhanced antibacterial effects in in vitro experiments. The aim of the present study was to verify the antibacterial efficacy of the Moth-eye film in practical environments. MATERIALS AND METHODS The antibacterial effects of three types of film (Moth-eye film, Flat film, and PET film) were compared. Sample films were pasted onto hand washing basins at the testing locations. After several hours, bacteria were collected from the surface of the sample films with one of three kinds of culture media stamper (to permit identification of bacterial species). The stampers were incubated for 48 hours at 35°C, and the numbers of colonies were counted. RESULTS AND DISCUSSION The number of common bacteria including E. coli and S. aureus obtained from the Moth-eye film was significantly lower than those from the PET film (p<0.05) and Flat film at 1 hour (p<0.05). This study found that the Moth-eye film showed a long-term (6h) antibacterial effect and the Moth-eye structure (PET coated with nanoscale cone-shaped pillars) demonstrated a physical antibacterial effect from earlier time points. Therefore, the Moth-eye film appears to have potential general-purpose applications in practical environments.
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Affiliation(s)
- Miho Yamada
- Display Technology Development Center, Development Group, Display Device Company, Sharp Corporation, Tenri, Nara, Japan
| | - Kiyoshi Minoura
- Display Technology Development Center, Development Group, Display Device Company, Sharp Corporation, Tenri, Nara, Japan
| | - Takashi Mizoguchi
- New Business Promotion Center, Development Group, Display Device Company, Sharp Corporation, Tenri, Nara, Japan
| | - Kenichiro Nakamatsu
- New Business Promotion Center, Development Group, Display Device Company, Sharp Corporation, Tenri, Nara, Japan
| | - Tokio Taguchi
- New Business Promotion Center, Development Group, Display Device Company, Sharp Corporation, Tenri, Nara, Japan
| | - Takuya Kameda
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Miho Sekiguchi
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Tatsuo Suzutani
- Department of Microbiology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Shinichi Konno
- Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
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Rtimi S, Nadtochenko V, Khmel I, Kiwi J. Evidence for differentiated ionic and surface contact effects driving bacterial inactivation by way of genetically modified bacteria. Chem Commun (Camb) 2018; 53:9093-9096. [PMID: 28758649 DOI: 10.1039/c7cc05013e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New evidence is presented for the bacterial inactivation of E. coli presenting normal porins on sputtered Ag-Cu surfaces compared with similar E. coli porinless bacteria. Inactivation at a reduced rate was observed on the genetically modified porinless bacteria interacting via surface contact with metal/oxides without the intervention of metal-ions.
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Affiliation(s)
- Sami Rtimi
- Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GPAO, Station 6, CH-1015, Lausanne, Switzerland.
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42
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Li J, Tang M, Xue Y. Review of the effects of silver nanoparticle exposure on gut bacteria. J Appl Toxicol 2018; 39:27-37. [PMID: 30247756 DOI: 10.1002/jat.3729] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 08/17/2018] [Accepted: 08/18/2018] [Indexed: 12/11/2022]
Abstract
Gut bacteria are involved in regulating several important physiological functions in the host, and intestinal dysbacteriosis plays an important role in several human diseases, including intestinal, metabolic and autoimmune disorders. Although silver nanoparticles (AgNPs) are increasingly being incorporated into medical and consumer products due to their unique physicochemical properties, studies have indicated their potential to affect adversely the gut bacteria. In this review, we focus on the biotoxicological effects of AgNPs entering the gastrointestinal tract and the relationship of these effects with important nanoscale properties. We discuss in detail the mechanisms underlying the bactericidal toxicity effects of AgNPs and explore the relationships between AgNPs, gut bacteria and disease. Finally, we highlight the need to focus on the negative effects of AgNPs usage to facilitate appropriate development of these particles.
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Affiliation(s)
- Jiangyan Li
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education, School of Public Health & Collaborative Innovation Center of Suzhou Nano Science and Technology, Southeast University, Nanjing, 210009, China.,Jiangsu Key Laboratory for Biomaterials and Devices, Southeast University, Nanjing, 210009, China
| | - Meng Tang
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education, School of Public Health & Collaborative Innovation Center of Suzhou Nano Science and Technology, Southeast University, Nanjing, 210009, China.,Jiangsu Key Laboratory for Biomaterials and Devices, Southeast University, Nanjing, 210009, China
| | - Yuying Xue
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education, School of Public Health & Collaborative Innovation Center of Suzhou Nano Science and Technology, Southeast University, Nanjing, 210009, China.,Jiangsu Key Laboratory for Biomaterials and Devices, Southeast University, Nanjing, 210009, China
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43
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Zhang R, Carlsson F, Edman M, Hummelgård M, Jonsson B, Bylund D, Olin H. Escherichia coli
Bacteria Develop Adaptive Resistance to Antibacterial ZnO Nanoparticles. ACTA ACUST UNITED AC 2018; 2:e1800019. [DOI: 10.1002/adbi.201800019] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 03/02/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Renyun Zhang
- Department of Natural Sciences Mid Sweden University SE‐85170 Sundsvall Sweden
| | - Fredrik Carlsson
- Department of Natural Sciences Mid Sweden University SE‐85170 Sundsvall Sweden
| | - Mattias Edman
- Department of Natural Sciences Mid Sweden University SE‐85170 Sundsvall Sweden
| | - Magnus Hummelgård
- Department of Natural Sciences Mid Sweden University SE‐85170 Sundsvall Sweden
| | | | - Dan Bylund
- Department of Natural Sciences Mid Sweden University SE‐85170 Sundsvall Sweden
| | - Håkan Olin
- Department of Natural Sciences Mid Sweden University SE‐85170 Sundsvall Sweden
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Faiz MB, Amal R, Marquis CP, Harry EJ, Sotiriou GA, Rice SA, Gunawan C. Nanosilver and the microbiological activity of the particulate solids versus the leached soluble silver. Nanotoxicology 2018; 12:263-273. [DOI: 10.1080/17435390.2018.1434910] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Merisa B. Faiz
- School of Chemical Engineering, UNSW Australia, Sydney, Australia
| | - Rose Amal
- School of Chemical Engineering, UNSW Australia, Sydney, Australia
| | | | | | - Georgios A. Sotiriou
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Scott A. Rice
- The Singapore Centre for Environmental Life Sciences Engineering and School of Biological Sciences, Nanyang Technological University, Singapore
| | - Cindy Gunawan
- School of Chemical Engineering, UNSW Australia, Sydney, Australia
- ithree Institute, University of Technology Sydney, Sydney, Australia
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45
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Westmeier D, Hahlbrock A, Reinhardt C, Fröhlich-Nowoisky J, Wessler S, Vallet C, Pöschl U, Knauer SK, Stauber RH. Nanomaterial–microbe cross-talk: physicochemical principles and (patho)biological consequences. Chem Soc Rev 2018; 47:5312-5337. [DOI: 10.1039/c6cs00691d] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
NPs’ characteristics impact their spontaneous binding to microbes, which may affect the (patho)biological identity of both NP and microbes.
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Affiliation(s)
- D. Westmeier
- Department of Nanobiomedicine/ENT
- University Medical Center of Mainz
- 55101 Mainz
- Germany
| | - A. Hahlbrock
- Department of Nanobiomedicine/ENT
- University Medical Center of Mainz
- 55101 Mainz
- Germany
| | - C. Reinhardt
- Center for Thrombosis and Hemostasis
- University Medical Center Mainz
- 55101 Mainz
- Germany
| | - J. Fröhlich-Nowoisky
- Multiphase Chemistry Department
- Max Planck Institute for Chemistry
- 55128 Mainz
- Germany
| | - S. Wessler
- Department of Molecular Biology
- Paris-Lodron University of Salzburg
- A-5020 Salzburg
- Austria
| | - C. Vallet
- Institute for Molecular Biology
- CENIDE
- University Duisburg-Essen
- 45117 Essen
- Germany
| | - U. Pöschl
- Multiphase Chemistry Department
- Max Planck Institute for Chemistry
- 55128 Mainz
- Germany
| | - S. K. Knauer
- Institute for Molecular Biology
- CENIDE
- University Duisburg-Essen
- 45117 Essen
- Germany
| | - R. H. Stauber
- Department of Nanobiomedicine/ENT
- University Medical Center of Mainz
- 55101 Mainz
- Germany
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46
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Panáček A, Kvítek L, Smékalová M, Večeřová R, Kolář M, Röderová M, Dyčka F, Šebela M, Prucek R, Tomanec O, Zbořil R. Bacterial resistance to silver nanoparticles and how to overcome it. NATURE NANOTECHNOLOGY 2018; 13:65-71. [PMID: 29203912 DOI: 10.1038/s41565-017-0013-y] [Citation(s) in RCA: 472] [Impact Index Per Article: 78.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 10/04/2017] [Indexed: 05/20/2023]
Abstract
Silver nanoparticles have already been successfully applied in various biomedical and antimicrobial technologies and products used in everyday life. Although bacterial resistance to antibiotics has been extensively discussed in the literature, the possible development of resistance to silver nanoparticles has not been fully explored. We report that the Gram-negative bacteria Escherichia coli 013, Pseudomonas aeruginosa CCM 3955 and E. coli CCM 3954 can develop resistance to silver nanoparticles after repeated exposure. The resistance stems from the production of the adhesive flagellum protein flagellin, which triggers the aggregation of the nanoparticles. This resistance evolves without any genetic changes; only phenotypic change is needed to reduce the nanoparticles' colloidal stability and thus eliminate their antibacterial activity. The resistance mechanism cannot be overcome by additional stabilization of silver nanoparticles using surfactants or polymers. It is, however, strongly suppressed by inhibiting flagellin production with pomegranate rind extract.
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Affiliation(s)
- Aleš Panáček
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Palacký University Olomouc, Olomouc, Czech Republic
| | - Libor Kvítek
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Palacký University Olomouc, Olomouc, Czech Republic.
| | - Monika Smékalová
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Palacký University Olomouc, Olomouc, Czech Republic
| | - Renata Večeřová
- Department of Microbiology, Palacký University Olomouc, Olomouc, Czech Republic
| | - Milan Kolář
- Department of Microbiology, Palacký University Olomouc, Olomouc, Czech Republic
| | - Magdalena Röderová
- Department of Microbiology, Palacký University Olomouc, Olomouc, Czech Republic
| | - Filip Dyčka
- Department of Protein Biochemistry and Proteomics, Centre of the Region Hana for Biotechnological and Agricultural Research, Palacký University Olomouc, Olomouc, Czech Republic
| | - Marek Šebela
- Department of Protein Biochemistry and Proteomics, Centre of the Region Hana for Biotechnological and Agricultural Research, Palacký University Olomouc, Olomouc, Czech Republic
| | - Robert Prucek
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Palacký University Olomouc, Olomouc, Czech Republic
| | - Ondřej Tomanec
- Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, Olomouc, Czech Republic
| | - Radek Zbořil
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Palacký University Olomouc, Olomouc, Czech Republic.
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Saeb ATM, Al-Rubeaan KA, Abouelhoda M, Selvaraju M, Tayeb HT. Genome sequencing and analysis of the first spontaneous Nanosilver resistant bacterium Proteus mirabilis strain SCDR1. Antimicrob Resist Infect Control 2017; 6:119. [PMID: 29204271 PMCID: PMC5701452 DOI: 10.1186/s13756-017-0277-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 11/09/2017] [Indexed: 11/10/2022] Open
Abstract
Background P. mirabilis is a common uropathogenic bacterium that can cause major complications in patients with long-standing indwelling catheters or patients with urinary tract anomalies. In addition, P. mirabilis is a common cause of chronic osteomyelitis in Diabetic foot ulcer (DFU) patients. We isolated P. mirabilis SCDR1 from a Diabetic ulcer patient. We examined P. mirabilis SCDR1 levels of resistance against Nanosilver colloids, the commercial Nanosilver and silver containing bandages and commonly used antibiotics. We utilized next generation sequencing techniques (NGS), bioinformatics, phylogenetic analysis and pathogenomics in the characterization of the infectious pathogen. Results P. mirabilis SCDR1 was the first Nanosilver resistant isolate collected from a diabetic patient polyclonal infection. P. mirabilis SCDR1 showed high levels of resistance against Nanosilver colloids, Nanosilver chitosan composite and the commercially available Nanosilver and silver bandages. The P. mirabilis -SCDR1 genome size is 3,815,621 bp. with G + C content of 38.44%. P. mirabilis-SCDR1 genome contains a total of 3533 genes, 3414 coding DNA sequence genes, 11, 10, 18 rRNAs (5S, 16S, and 23S), and 76 tRNAs. Our isolate contains all the required pathogenicity and virulence factors to establish a successful infection. P. mirabilis SCDR1 isolate is a potential virulent pathogen that despite its original isolation site, the wound, can establish kidney infection and its associated complications. P. mirabilis SCDR1 contains several mechanisms for antibiotics and metals resistance, including, biofilm formation, swarming mobility, efflux systems, and enzymatic detoxification. Conclusion P. mirabilis SCDR1 is the first reported spontaneous Nanosilver resistant bacterial strain. P. mirabilis SCDR1 possesses several mechanisms that may lead to the observed Nanosilver resistance. Electronic supplementary material The online version of this article (10.1186/s13756-017-0277-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Amr T M Saeb
- Genetics and Biotechnology Department, Strategic Center for Diabetes Research, College of medicine, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Khalid A Al-Rubeaan
- Genetics and Biotechnology Department, Strategic Center for Diabetes Research, College of medicine, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Mohamed Abouelhoda
- Genetics Department, King Faisal Specialist Hospital and Research Center, Riyadh, Kingdom of Saudi Arabia.,Saudi Human Genome Project, King Abdulaziz City for Science and Technology (KACST), Riyadh, Kingdom of Saudi Arabia
| | - Manojkumar Selvaraju
- Saudi Human Genome Project, King Abdulaziz City for Science and Technology (KACST), Riyadh, Kingdom of Saudi Arabia.,Integrated Gulf Biosystems, Riyadh, Kingdom of Saudi Arabia
| | - Hamsa T Tayeb
- Genetics Department, King Faisal Specialist Hospital and Research Center, Riyadh, Kingdom of Saudi Arabia.,Saudi Human Genome Project, King Abdulaziz City for Science and Technology (KACST), Riyadh, Kingdom of Saudi Arabia
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48
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Kaweeteerawat C, Na Ubol P, Sangmuang S, Aueviriyavit S, Maniratanachote R. Mechanisms of antibiotic resistance in bacteria mediated by silver nanoparticles. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2017; 80:1276-1289. [PMID: 29020531 DOI: 10.1080/15287394.2017.1376727] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Revised: 08/07/2017] [Accepted: 09/04/2017] [Indexed: 06/07/2023]
Abstract
Silver nanoparticles (AgNPs) are widely used in industry, consumer products, and medical appliances due to their efficient antimicrobial properties. However, information on environmental toxicity and bacterial impact of these particles is not completely elucidated. Results showed that AgNPs produced growth inhibition and oxidative stress in bacteria Escherichia coli (gram negative) and Staphylococcus aureus (gram positive), with half-maximal inhibitory concentrations (IC50) of 12 and 7 mg/L, respectively. Surprisingly, bacteria pre-exposed to sublethal dose of AgNPs exhibited increased resistance toward antibiotics (ampicillin and Pen-Strep) with IC50 elevated by 3-13-fold. Further, AgNP pre-exposure raised the minimal inhibitory concentration and minimal biocidal concentration by two- to eightfold when cells were challenged with antibiotics with diverse mechanisms of action (penicillin, chloramphenicol, and kanamycin). Interestingly, we found that upon exposure to ampicillin, strains pretreated with AgNPs exhibited lower levels of membrane damage and oxidative stress, together with elevated levels of intracellular ATP relative to untreated cells. Bacterial reverse mutation assay (Ames test) showed that AgNPs are highly mutagenic, consistent with further assays demonstrating abiotic reactive oxygen species (ROS) generation and intrinsic DNA cleavage activity in vitro of AgNPs. Overall, our results suggest that AgNPs enhance bacterial resistance to antibiotics by promoting stress tolerance through induction of intracellular ROS. Our data suggest potential consequences of incidental environmental exposure of bacteria to AgNPs and indicate the need to regulate use and disposal of AgNPs in industry and consumer products.
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Affiliation(s)
- Chitrada Kaweeteerawat
- a Nano Safety and Risk Assessment Laboratory , National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA) , Khlong Luang , Pathum Thani , Thailand
| | - Preeyawis Na Ubol
- a Nano Safety and Risk Assessment Laboratory , National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA) , Khlong Luang , Pathum Thani , Thailand
| | - Sanirat Sangmuang
- a Nano Safety and Risk Assessment Laboratory , National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA) , Khlong Luang , Pathum Thani , Thailand
| | - Sasitorn Aueviriyavit
- a Nano Safety and Risk Assessment Laboratory , National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA) , Khlong Luang , Pathum Thani , Thailand
| | - Rawiwan Maniratanachote
- a Nano Safety and Risk Assessment Laboratory , National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA) , Khlong Luang , Pathum Thani , Thailand
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Antibacterial effects of the artificial surface of nanoimprinted moth-eye film. PLoS One 2017; 12:e0185366. [PMID: 28934372 PMCID: PMC5608414 DOI: 10.1371/journal.pone.0185366] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Accepted: 08/20/2017] [Indexed: 12/31/2022] Open
Abstract
The antibacterial effect of a nanostructured film, known as “moth-eye film,” was investigated. The moth-eye film has artificially formed nano-pillars, consisting of hydrophilic resin with urethane acrylate and polyethylene glycol (PEG) derivatives, all over its surface that replicates a moth’s eye. Experiments were performed to compare the moth-eye film with a flat-surfaced film produced from the same materials. The JIS Z2801 film-covering method revealed that the two films produced a decrease in Staphylococcus aureus and Esherichia coli titers of over 5 and 3 logs, respectively. There was no marked difference in the antibacterial effects of the two surfaces. However, the antibacterial effects were reduced by immersion of the films in water. These results indicated that a soluble component(s) of the resin possessed the antibacterial activity, and this component was identified as PEG derivatives by time-of-flight secondary ion mass spectrometry (TOF-SIMS) and Fourier transform infrared spectroscopy (FT-IR). When a small volume of bacterial suspension was dropped on the films as an airborne droplet model, both films showed antibacterial effects, but that of the moth-eye film was more potent. It was considered that the moth-eye structure allowed the bacteria-loaded droplet to spread and allow greater contact between the bacteria and the film surface, resulting in strong adherence of the bacteria to the film and synergistically enhanced bactericidal activity with chemical components. The antibacterial effect of the moth-eye film has been thus confirmed under a bacterial droplet model, and it appears attractive due to its antibacterial ability, which is considered to result not only from its chemical make-up but also from physical adherence.
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Rtimi S, Giannakis S, Pulgarin C. Self-Sterilizing Sputtered Films for Applications in Hospital Facilities. Molecules 2017; 22:E1074. [PMID: 28657579 PMCID: PMC6152303 DOI: 10.3390/molecules22071074] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 05/23/2017] [Indexed: 12/02/2022] Open
Abstract
This review addresses the preparation of antibacterial 2D textile and thin polymer films and 3D surfaces like catheters for applications in hospital and health care facilities. The sputtering of films applying different levels of energy led to the deposition of metal/oxide/composite/films showing differentiated antibacterial kinetics and surface microstructure. The optimization of the film composition in regards to the antibacterial active component was carried out in each case to attain the fastest antibacterial kinetics, since this is essential when designing films avoiding biofilm formation (under light and in the dark). The antimicrobial performance of these sputtered films on Staphylococcus aureus (MRSA) and Escherichia coli (E. coli) were tested. A protecting effect of TiO₂ was found for the release of Cu by the TiO₂-Cu films compared to films sputtered by Cu only. The Cu-released during bacterial inactivation by TiO₂-Cu was observed to be much lower compared to the films sputtered only by Cu. The FeOx-TiO₂-PE films induced E. coli inactivation under solar or under visible light with a similar inactivation kinetics, confirming the predominant role of FeOx in these composite films. By up-to-date surface science techniques were used to characterize the surface properties of the sputtered films. A mechanism of bacteria inactivation is suggested for each particular film consistent with the experimental results found and compared with the literature.
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Affiliation(s)
- Sami Rtimi
- Group of Advanced Oxidation Processes, Swiss Federal Institute of Technology, EPFL-SB-ISIC-GPAO, Station 6, CH-1015 Lausanne, Switzerland.
| | - Stefanos Giannakis
- Group of Advanced Oxidation Processes, Swiss Federal Institute of Technology, EPFL-SB-ISIC-GPAO, Station 6, CH-1015 Lausanne, Switzerland.
| | - Cesar Pulgarin
- Group of Advanced Oxidation Processes, Swiss Federal Institute of Technology, EPFL-SB-ISIC-GPAO, Station 6, CH-1015 Lausanne, Switzerland.
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