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The Role of Bacterial Biofilm in Antibiotic Resistance and Food Contamination. Int J Microbiol 2020; 2020:1705814. [PMID: 32908520 PMCID: PMC7468660 DOI: 10.1155/2020/1705814] [Citation(s) in RCA: 108] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 06/26/2020] [Accepted: 07/30/2020] [Indexed: 12/14/2022] Open
Abstract
Biofilm is a microbial association or community attached to different biotic or abiotic surfaces or environments. These surface-attached microbial communities can be found in food, medical, industrial, and natural environments. Biofilm is a critical problem in the medical sector since it is formed on medical implants within human tissue and involved in a multitude of serious chronic infections. Food and food processing surface become an ideal environment for biofilm formation where there are sufficient nutrients for microbial growth and attachment. Therefore, biofilm formation on these surfaces, especially on food processing surface becomes a challenge in food safety and human health. Microorganisms within a biofilm are encased within a matrix of extracellular polymeric substances that can act as a barrier and recalcitrant for different hostile conditions such as sanitizers, antibiotics, and other hygienic conditions. Generally, they persist and exist in food processing environments where they become a source of cross-contamination and foodborne diseases. The other critical issue with biofilm formation is their antibiotic resistance which makes medication difficult, and they use different physical, physiological, and gene-related factors to develop their resistance mechanisms. In order to mitigate their production and develop controlling methods, it is better to understand growth requirements and mechanisms. Therefore, the aim of this review article is to provide an overview of the role of bacterial biofilms in antibiotic resistance and food contamination and emphasizes ways for controlling its production.
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Role of Lactobacillus biofilms in Listeria monocytogenes adhesion to glass surfaces. Int J Food Microbiol 2020; 334:108804. [PMID: 32818764 DOI: 10.1016/j.ijfoodmicro.2020.108804] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 07/23/2020] [Accepted: 07/27/2020] [Indexed: 02/07/2023]
Abstract
Listeria monocytogenes can form long-lasting biofilms on food-contact surfaces. Lactic acid bacteria (LAB) have shown promise in antagonizing this microorganism in liquid media. However, the ecological relationships differ when cells are forming biofilms. In this work, we propose the use of Lactobacillus biofilms as surface "conditioners" to modulate the adhesion of L. monocytogenes. For this, the biofilm formation ability of Lactobacillus fermentum MP26 and Lactobacillus salivarius MP14 (human milk origin), fluorescently labeled by transfer of the mCherry-encoding pRCR12 plasmid, was first evaluated. Then, mature biofilms of these strains transformed with pRCR12 for expressing the fluorescent protein mCherry were used as adhesion substrate for GFP-tagged L. monocytogenes Scott A. The resulting biofilms were studied in terms of cellular population and attached biomass (cells plus matrix). Species distribution inside the biofilm structure was revealed by confocal laser scanning microscopy (CLSM). Although none of the Lactobacillus spp. strains reduced the adhesion of L. monocytogenes Scott A, species interactions seem to interfere with the synthesis of extracellular polymeric substances and species distribution inside the biofilms. In dual-species biofilms, CLSM images revealed that Lactobacillus cells were trapping those of L. monocytogenes Scott A. When surfaces were conditioned with Lactobacillus biofilms, the spatial distribution of L. monocytogenes Scott A cells was species-specific, suggesting these interactions are governing the ultimate biofilm structure. The results here obtained open new possibilities for controlling L. monocytogenes dispersal using these Lactobacillus spp. biofilms as a "natural" immobilization way. Whether species interactions could modify the virulence of L. monocytogenes still remains unclear.
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Shimabukuro M, Hiji A, Manaka T, Nozaki K, Chen P, Ashida M, Tsutsumi Y, Nagai A, Hanawa T. Time-Transient Effects of Silver and Copper in the Porous Titanium Dioxide Layer on Antibacterial Properties. J Funct Biomater 2020; 11:E44. [PMID: 32580288 PMCID: PMC7353535 DOI: 10.3390/jfb11020044] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 06/18/2020] [Accepted: 06/19/2020] [Indexed: 12/25/2022] Open
Abstract
Recently, silver (Ag) and copper (Cu) have been incorporated into a titanium (Ti) surface to realize their antibacterial property. This study investigated both the durability of the antibacterial effect and the surface change of the Ag- and Cu-incorporated porous titanium dioxide (TiO2) layer. Ag- and Cu-incorporated TiO2 layers were formed by micro-arc oxidation (MAO) treatment using the electrolyte with Ag and Cu ions. Ag- and Cu-incorporated specimens were incubated in saline during a period of 0-28 days. The changes in both the concentrations and chemical states of the Ag and Cu were characterized using X-ray photoelectron spectroscopy (XPS). The durability of the antibacterial effects against Escherichia coli (E. coli) were evaluated by the international organization for standardization (ISO) method. As a result, the Ag- and Cu-incorporated porous TiO2 layers were formed on a Ti surface by MAO. The chemical state of Ag changed from Ag2O to metallic Ag, whilst that of Cu did not change by incubation in saline for up to 28 days. Cu existed as a stable Cu2O compound in the TiO2 layer during the 28 days of incubation in saline. The concentrations of Ag and Cu were dramatically decreased by incubation for up to 7 days, and remained a slight amount until 28 days. The antibacterial effect of Ag-incorporated specimens diminished, and that of Cu was maintained even after incubation in saline. Our study suggests the importance of the time-transient effects of Ag and Cu on develop their antibacterial effects.
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Affiliation(s)
- Masaya Shimabukuro
- Department of Biomaterials, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Akari Hiji
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; (A.H.); (T.M.); (K.N.)
| | - Tomoyo Manaka
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; (A.H.); (T.M.); (K.N.)
| | - Kosuke Nozaki
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; (A.H.); (T.M.); (K.N.)
| | - Peng Chen
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan; (P.C.); (M.A.); (T.H.)
| | - Maki Ashida
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan; (P.C.); (M.A.); (T.H.)
| | - Yusuke Tsutsumi
- Research Center for Structural Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;
| | - Akiko Nagai
- Department of Anatomy, School of Dentistry, Aichi Gakuin University, 1-100 Kusumoto, Chikusa-ku, Nagoya 464-8650, Japan;
| | - Takao Hanawa
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan; (P.C.); (M.A.); (T.H.)
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Zhan K, Yang T, Feng B, Zhu X, Chen Y, Huo Y, Zhao G. The protective roles of tea tree oil extracts in bovine mammary epithelial cells and polymorphonuclear leukocytes. J Anim Sci Biotechnol 2020; 11:62. [PMID: 32549980 PMCID: PMC7294674 DOI: 10.1186/s40104-020-00468-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 05/01/2020] [Indexed: 11/23/2022] Open
Abstract
Background Tea tree oil (TTO) plays an important role in antibacterial activity and alleviating the inflammatory responses. Bovine mammary epithelium and polymorphonuclear leukocytes (PMNL) can actively respond to bovine mastitis infection. However, regulatory effects of TTO extracts on the innate immune response of bovine mammary epithelial cells (BMECs) and PMNL remain not reported. Therefore, aim of the study was to evaluate the effects of TTO extracts on the mRNA levels of the genes involved in the innate immune response of BMECs and PMNL. Results Our results demonstrated that addition of 0.025% and 0.05% TTO increased the proliferation of BMECs, and significantly enhanced (P < 0.05) the viability of BMECs exposed to Staphylococcus aureus (S. aureus). An inhibitory effect was observed against the growth of S. aureus by TTO incubation. The 0.05% TTO reduced S. aureus biofilm formation, association and invasion of S. aureus to BMECs, and changed the morphological and structural features of S. aureus. The proinflammatory cytokines IL-1β, IL-6, and TNF-α were decreased (P < 0.001) by the incubation of TTO. Interestingly, the expression of IL-8 known for PMNL chemotactic function was elevated (P < 0.05) by 0.05% TTO treatment. Consistently, 0.05% TTO increased the migration of PMNL in S. aureus-exposed BMECs when compared with S. aureus treatment alone (P < 0.05). In addition, PMNL incubated with 0.05% TTO decreased the levels of NFKB inhibitor alpha (NFKBIA) and TNF-α. Conclusions Our results indicate that use of TTO can relieve the BMECs pro-inflammatory response caused by S. aureus and promote the migration of PMNL to mount the innate immune responses, and it may be novel strategy for the treatment of bovine mastitis caused by S. aureus.
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Affiliation(s)
- Kang Zhan
- Institute of Animal Culture Collection and Application, College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009 China
| | - Tianyu Yang
- Institute of Animal Culture Collection and Application, College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009 China
| | - Baobao Feng
- Institute of Animal Culture Collection and Application, College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009 China
| | - Xinyu Zhu
- Wuxi Chenfang Biotechnology Co., Ltd., Wuxi, China
| | - Yinyin Chen
- Institute of Animal Culture Collection and Application, College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009 China
| | - Yongjiu Huo
- Institute of Animal Culture Collection and Application, College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009 China
| | - Guoqi Zhao
- Institute of Animal Culture Collection and Application, College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009 China
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whISOBAX TM Inhibits Bacterial Pathogenesis and Enhances the Effect of Antibiotics. Antibiotics (Basel) 2020; 9:antibiotics9050264. [PMID: 32438609 PMCID: PMC7277200 DOI: 10.3390/antibiotics9050264] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 05/09/2020] [Accepted: 05/11/2020] [Indexed: 12/14/2022] Open
Abstract
As bacteria are becoming more resistant to commonly used antibiotics, alternative therapies are being sought. whISOBAX (WH) is a witch hazel extract that is highly stable (tested up to 2 months in 37 °C) and contains a high phenolic content, where 75% of it is hamamelitannin and traces of gallic acid. Phenolic compounds like gallic acid are known to inhibit bacterial growth, while hamamelitannin is known to inhibit staphylococcal pathogenesis (biofilm formation and toxin production). WH was tested in vitro for its antibacterial activity against clinically relevant Gram-positive and Gram-negative bacteria, and its synergy with antibiotics determined using checkerboard assays followed by isobologram analysis. WH was also tested for its ability to suppress staphylococcal pathogenesis, which is the cause of a myriad of resistant infections. Here we show that WH inhibits the growth of all bacteria tested, with variable efficacy levels. The most WH-sensitive bacteria tested were Staphylococcus epidermidis,Staphylococcus aureus, Enterococcus faecium and Enterococcus faecalis, followed by Acinetobacter baumannii, Klebsiella pneumoniae, Escherichia coli,Pseudomonas aeruginosa, Streptococcus agalactiae and Streptococcus pneumoniae. Furthermore, WH was shown on S. aureus to be synergistic to linezolid and chloramphenicol and cumulative to vancomycin and amikacin. The effect of WH was tested on staphylococcal pathogenesis and shown here to inhibit biofilm formation (tested on S. epidermidis) and toxin production (tested on S. aureus Enterotoxin A (SEA)). Toxin inhibition was also evident in the presence of subinhibitory concentrations of ciprofloxacin that induces pathogenesis. Put together, our study indicates that WH is very effective in inhibiting the growth of multiple types of bacteria, is synergistic to antibiotics, and is also effective against staphylococcal pathogenesis, often the cause of persistent infections. Our study thus suggests the benefits of using WH to combat various types of bacterial infections, especially those that involve resistant persistent bacterial pathogens.
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Li J, Wu T, Peng W, Zhu Y. Effects of resveratrol on cariogenic virulence properties of Streptococcus mutans. BMC Microbiol 2020; 20:99. [PMID: 32303183 PMCID: PMC7165372 DOI: 10.1186/s12866-020-01761-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 03/23/2020] [Indexed: 02/01/2023] Open
Abstract
Background Streptococcus mutans is the principal etiological agent of human dental caries. The major virulence factors of S. mutans are acid production, acid tolerance, extracellular polysaccharide (EPS) synthesis and biofilm formation. The aim of this study is to evaluate the effect of resveratrol, a natural compound, on virulence properties of S. mutans. Results Resveratrol at sub-MIC levels significantly decreased acid production and acid tolerance, inhibited synthesis of water-soluble polysaccharide and water-insoluble polysaccharide, compromised biofilm formation. Related virulence gene expression (ldh, relA, gtfC, comDE) was down-regulated with increasing concentrations of resveratrol. Conclusions Resveratrol has an inhibitory effect on S. mutans cariogenic virulence properties and it represents a promising anticariogenic agent.
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Affiliation(s)
- Jinheng Li
- Department of General Dentistry, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, 639 Zhi Zao Ju Road, Shanghai, 200011, China
| | - Tiantian Wu
- Department of General Dentistry, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, 639 Zhi Zao Ju Road, Shanghai, 200011, China
| | - Weiwei Peng
- Department of General Dentistry, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, 639 Zhi Zao Ju Road, Shanghai, 200011, China
| | - Yaqin Zhu
- Department of General Dentistry, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, 639 Zhi Zao Ju Road, Shanghai, 200011, China.
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57
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Shimabukuro M, Tsutsumi Y, Nozaki K, Chen P, Yamada R, Ashida M, Doi H, Nagai A, Hanawa T. Investigation of antibacterial effect of copper introduced titanium surface by electrochemical treatment against facultative anaerobic bacteria. Dent Mater J 2020; 39:639-647. [PMID: 32249235 DOI: 10.4012/dmj.2019-178] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study investigated the efficacy of copper (Cu) as an antibacterial element incorporated on titanium (Ti) surface by electrochemical treatment. Cu was incorporated onto Ti surface by micro-arc oxidation (MAO). A small amount of Cu was incorporated into the oxide layer and was found to be in oxidized states. Cu-incorporated samples exhibited no-harmful effect on the proliferation of osteoblastlike cells. Moreover, the difference in antibacterial property between fresh and incubated samples was evaluated using gram-positive and gram-negative facultative anaerobic bacteria. The specific antibacterial property of Cu incorporated into the Ti surface were confirmed. The antibacterial property prolonged upon immersion in physiological saline for 28 days. In other words, MAO-treated Ti containing Cu in this study is expected to achieve long-term antibacterial property in practical usage.
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Affiliation(s)
- Masaya Shimabukuro
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.,Department of Biomaterials, Faculty of Dental Science, Kyushu University
| | - Yusuke Tsutsumi
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University.,Research Center for Structural Materials, National Institute for Materials Science (NIMS)
| | - Kosuke Nozaki
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Peng Chen
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
| | - Risa Yamada
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Maki Ashida
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
| | - Hisashi Doi
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
| | - Akiko Nagai
- Department of Anatomy, School of Dentistry, Aichi Gakuin University
| | - Takao Hanawa
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
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Buxadera-Palomero J, Godoy-Gallardo M, Molmeneu M, Punset M, Gil FJ. Antibacterial Properties of Triethoxysilylpropyl Succinic Anhydride Silane (TESPSA) on Titanium Dental Implants. Polymers (Basel) 2020; 12:E773. [PMID: 32244655 PMCID: PMC7240528 DOI: 10.3390/polym12040773] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 03/23/2020] [Accepted: 03/28/2020] [Indexed: 11/16/2022] Open
Abstract
Infections related to dental implants are a common complication that can ultimately lead to implant failure, and thereby carries significant health and economic costs. In order to ward off these infections, this paper explores the immobilization of triethoxysilylpropyl succinic anhydride (TESPSA, TSP) silane onto dental implants, and the interaction of two distinct monospecies biofilms and an oral plaque with the coated titanium samples. To this end, titanium disks from prior machining were first activated by a NaOH treatment and further functionalized with TESPSA silane. A porous sodium titanate surface was observed by scanning electron microscopy and X-ray photoelectron spectroscopy analyses confirmed the presence of TESPSA on the titanium samples (8.4% for Ti-N-TSP). Furthermore, a lactate dehydrogenase assay concluded that TESPSA did not have a negative effect on the viability of human fibroblasts. Importantly, the in vitro effect of modified surfaces against Streptococcus sanguinis, Lactobacillus salivarius and oral plaque were studied using a viable bacterial adhesion assay. A significant reduction was achieved in all cases but, as expected, with different effectiveness against simple mono-species biofilm (ratio dead/live of 0.4) and complete oral biofilm (ratio dead/live of 0.6). Nevertheless, this approach holds a great potential to provide dental implants with antimicrobial properties.
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Affiliation(s)
- Judit Buxadera-Palomero
- Biomaterials, Biomechanics and Tissue Engineering Group, Department of Materials Science and Engineering, Technical University of Catalonia (UPC), Av. Eduard Maristany, 10-14, 08019 Barcelona, Spain; (J.B.-P.); (M.M.); (M.P.)
- Barcelona Research Centre in Multiscale Science and Engineering, Technical University of Catalonia (UPC), Av. Eduard Maristany, 10-14, 08019 Barcelona, Spain
| | - Maria Godoy-Gallardo
- Bioengineering Institute of Technology (BIT), Universitat Internacional de Catalunya (UIC), C. Josep Trueta s/n, 08195 Sant Cugat del Vallès, Spain;
- Basic Science Department, Faculty of Medicine and Health Science, Universitat Internacional de Catalunya (UIC), C. Josep Trueta s/n, 08195 Sant Cugat del Vallès, Spain
| | - Meritxell Molmeneu
- Biomaterials, Biomechanics and Tissue Engineering Group, Department of Materials Science and Engineering, Technical University of Catalonia (UPC), Av. Eduard Maristany, 10-14, 08019 Barcelona, Spain; (J.B.-P.); (M.M.); (M.P.)
- Barcelona Research Centre in Multiscale Science and Engineering, Technical University of Catalonia (UPC), Av. Eduard Maristany, 10-14, 08019 Barcelona, Spain
| | - Miquel Punset
- Biomaterials, Biomechanics and Tissue Engineering Group, Department of Materials Science and Engineering, Technical University of Catalonia (UPC), Av. Eduard Maristany, 10-14, 08019 Barcelona, Spain; (J.B.-P.); (M.M.); (M.P.)
- Barcelona Research Centre in Multiscale Science and Engineering, Technical University of Catalonia (UPC), Av. Eduard Maristany, 10-14, 08019 Barcelona, Spain
- UPC Innovation and Technology Center (CIT-UPC), Technical University of Catalonia (UPC), C. Jordi Girona 3-1, 08034 Barcelona, Spain
| | - Francisco Javier Gil
- Bioengineering Institute of Technology (BIT), Universitat Internacional de Catalunya (UIC), C. Josep Trueta s/n, 08195 Sant Cugat del Vallès, Spain;
- School of Dentistry, Faculty of Medicine and Health Science, Universitat Internacional de Catalunya (UIC), C. Josep Trueta s/n, 08195 Sant Cugat del Vallès, Spain
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Benmouna Z, Dalache F, Zadi-Karam H, Karam NE, Vuotto C. Ability of Three Lactic Acid Bacteria to Grow in Sessile Mode and to Inhibit Biofilm Formation of Pathogenic Bacteria. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1282:105-114. [PMID: 32034730 DOI: 10.1007/5584_2020_495] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In this study, we explored the effect of three lactic acid bacteria (LAB), i.e. Enterococcus sp CM9, Enterococcus sp CM18 and Enterococcus faecium H3, and their supernatants, on seven biofilm-forming pathogenic strains isolated from human urinary tract or nose infections. By quantitative biofilm production assay, a strong adherence ability of Enterococcus sp CM9 and Enterococcus sp CM18 was revealed while E. faecium H3 resulted to be moderately adherent. Inhibition tests demonstrated an antimicrobial activity of LAB against pathogens.The presence of cell free supernatant (CFS) of CM9 and CM18 strains significantly decreased the adhesion of S. aureus 10,850, S. epidermidis 4,296 and E. coli FSL24. The CFS of H3 strain was effective against S. epidermidis 4,296 and P. aeruginosa PA1FSL biofilms only. Biofilm formation of K. pneumoniae Kp20FSL, A. baumannii AB8FSL and ESBL+ E. coli FS101570 have not been affected by any CSF while P. aeruginosa PA1FSL biofilm increase in presence of CM9 and CM18 CFS.Confocal Laser Scanning Microscopy revealed that K. pneumoniae Kp20FSL biofilm was inhibited by Enterococcus sp CM9, when grown together.Our results suggest that the LAB strains and/or their bacteriocins can be considered as potential tools to control biofilm formation of some bacterial pathogens.
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Affiliation(s)
- Z Benmouna
- Laboratory of Micro-organisms Biology and Biotechnology, Department of Biotechnology, Faculty of Natural Sciences and Life, University of Oran, Oran, Algeria
| | - F Dalache
- Laboratory of Micro-organisms Biology and Biotechnology, Department of Biotechnology, Faculty of Natural Sciences and Life, University of Oran, Oran, Algeria.,Department of Biology, Faculty of Natural Sciences and Life, University of Mostaganem Abdelhamid Ibn Badis, Mostaganem, Algeria
| | - H Zadi-Karam
- Laboratory of Micro-organisms Biology and Biotechnology, Department of Biotechnology, Faculty of Natural Sciences and Life, University of Oran, Oran, Algeria
| | - N-E Karam
- Laboratory of Micro-organisms Biology and Biotechnology, Department of Biotechnology, Faculty of Natural Sciences and Life, University of Oran, Oran, Algeria
| | - C Vuotto
- Microbial Biofilm Laboratory, IRCCS Fondazione Santa Lucia, Rome, Italy.
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Vergalito F, Pietrangelo L, Petronio Petronio G, Colitto F, Alfio Cutuli M, Magnifico I, Venditti N, Guerra G, Di Marco R. Vitamin E for Prevention of Biofilm-caused Healthcare-associated Infections. Open Med (Wars) 2019; 15:14-21. [PMID: 31922015 PMCID: PMC6944457 DOI: 10.1515/med-2020-0004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 10/29/2019] [Indexed: 12/20/2022] Open
Abstract
The healthcare-associated infections (HCAIs) occur in patients both in nosocomial environments and in community. More often HCAIs are associated to the use of medical devices and bacterial biofilm development on these equipments. Due to the clinical and economic relevance of this topic, new strategies for the treatment of infections caused by biofilm proliferation are unceasingly searched by scientists. The present study investigated the role of vitamin E to reduce the biofilm formation for a larger panel of human pathogens, including strains of Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Acinetobacter baumannii, Pseudomonas aeruginosa and Pseudomonas putida. This potential activity was tested by placing a preparation of vitamin E (α-Tocopheryl acetate) as interface between the bacterial culture and the polystyrene walls of a 96 well plate at different concentrations of glucose, used as a biofilm enhancer. The Staphylococcus genus was further investigated by spreading the vitamin E on a silicone catheter lumen and evaluating its influence on the bacterial colonization. From our results, vitamin E has been able to interfere with bacterial biofilm and prevent in vitro biofilm formation. Furthermore, the ability of Staphylococcus aureus and Staphylococcus epidermidis to colonize the catheter surface decreased as a result of vitamin E application.
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Affiliation(s)
- Franca Vergalito
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo 173-8610, Japan
| | - Laura Pietrangelo
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, via De Sanctis snc, 86100 Campobasso, Italy
| | - Giulio Petronio Petronio
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, via De Sanctis snc, 86100 Campobasso, Italy
| | - Federica Colitto
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, via De Sanctis snc, 86100 Campobasso, Italy
| | - Marco Alfio Cutuli
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, via De Sanctis snc, 86100 Campobasso, Italy
| | - Irene Magnifico
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, via De Sanctis snc, 86100 Campobasso, Italy
| | - Noemi Venditti
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, via De Sanctis snc, 86100 Campobasso, Italy
| | - Germano Guerra
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, via De Sanctis snc, 86100 Campobasso, Italy
| | - Roberto Di Marco
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, via De Sanctis snc, 86100 Campobasso, Italy
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Inhibiting bacterial colonization on catheters: Antibacterial and antibiofilm activities of bacteriocins from Lactobacillus plantarum SJ33. J Glob Antimicrob Resist 2019; 19:85-92. [DOI: 10.1016/j.jgar.2019.02.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 02/27/2019] [Accepted: 02/27/2019] [Indexed: 01/08/2023] Open
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Chemical and Biological Roles of Zinc in a Porous Titanium Dioxide Layer Formed by Micro-Arc Oxidation. COATINGS 2019. [DOI: 10.3390/coatings9110705] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This study investigated the time transient effect of zinc (Zn) in the porous titanium dioxide formed by micro-arc oxidation (MAO) treatment routinely performed for Zn-containing electrolytes. The aim of our analysis was to understand the changes in both the chemical and biological properties of Zn in physiological saline. The morphology of the Zn-incorporated MAO surface did not change, and a small amount of Zn ions were released at early stages of incubation in saline. We observed a decrease in Zn concentration in the oxide layer because its release and chemical state (Zn2+ compound to ZnO) changed over time during incubation in saline. In addition, the antibacterial property of the Zn-incorporated MAO surface developed at late periods after the incubation process over a course of 28 days. Furthermore, osteogenic cells were able to proliferate and were calcified on the specimens with Zn. The changes related to Zn in saline had non-toxic effects on the osteogenic cells. In conclusion, the time transient effect of Zn in a porous titanium dioxide layer was beneficial to realize dual functions, namely the antibacterial property and osteogenic cell compatibility. Our study suggests the importance of the chemical state changes of Zn to control its chemical and biological properties.
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Abstract
The effects of Ti, Nb, Ta, Zr, and Ag on cellular and bacterial adhesion were investigated in this study. Moreover, the relationships between surface compositions, metal ion release behaviors, and biological responses were examined. As a result, MC3T3-E1 cells and S. aureus were able to better attach to Ti and Zr rather than the Nb and Ta specimens. For the Ag specimen, the amount of Ag ions released into Hanks’ solution was the largest among all the specimens. Cellular and bacterial adhesion onto the Ag specimen was inhibited compared with the other specimens, because of Ag ion release. Alternatively, Nb and Ta specimens exhibited specific biological responses. Cellular adhesion on Nb and Ta specimens was similar to that on Ti, while bacterial adhesion on Nb and Ta specimens was inhibited compared with that on Ti. This study proved that Nb and Ta inhibited bacterial adhesion and exhibited no harmful effects on cellular adhesion. In addition, these results indicate that the passive layer on Nb and Ta plays a key role in the inhibition of bacterial adhesion.
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64
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Rinaldo S, Giardina G, Mantoni F, Paone A, Cutruzzolà F. Beyond nitrogen metabolism: nitric oxide, cyclic-di-GMP and bacterial biofilms. FEMS Microbiol Lett 2019; 365:4834012. [PMID: 29401255 DOI: 10.1093/femsle/fny029] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 01/31/2018] [Indexed: 12/18/2022] Open
Abstract
The nitrogen cycle pathways are responsible for the circulation of inorganic and organic N-containing molecules in nature. Among these pathways, those involving amino acids, N-oxides and in particular nitric oxide (NO) play strategic roles in the metabolism of microorganisms in natural environments and in host-pathogen interactions. Beyond their role in the N-cycle, amino acids and NO are also signalling molecules able to influence group behaviour in microorganisms and cell-cell communication in multicellular organisms, including humans. In this minireview, we summarise the role of these compounds in the homeostasis of the bacterial communities called biofilms, commonly found in environmental, industrial and medical settings. Biofilms are difficult to eradicate since they are highly resistant to antimicrobials and to the host immune system. We highlight the effect of amino acids such as glutamate, glutamine and arginine and of NO on the signalling pathways involved in the metabolism of 3',5'-cyclic diguanylic acid (c-di-GMP), a master regulator of motility, attachment and group behaviour in bacteria. The study of the metabolic routes involving these N-containing compounds represents an attractive topic to identify targets for biofilm control in both natural and medical settings.
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Affiliation(s)
- Serena Rinaldo
- Department of Biochemical Sciences, Istituto Pasteur Italia-Fondazione Cenci Bolognetti, Sapienza University of Rome, 00185 Rome, Italy
| | - Giorgio Giardina
- Department of Biochemical Sciences, Istituto Pasteur Italia-Fondazione Cenci Bolognetti, Sapienza University of Rome, 00185 Rome, Italy
| | - Federico Mantoni
- Department of Biochemical Sciences, Istituto Pasteur Italia-Fondazione Cenci Bolognetti, Sapienza University of Rome, 00185 Rome, Italy
| | - Alessio Paone
- Department of Biochemical Sciences, Istituto Pasteur Italia-Fondazione Cenci Bolognetti, Sapienza University of Rome, 00185 Rome, Italy
| | - Francesca Cutruzzolà
- Department of Biochemical Sciences, Istituto Pasteur Italia-Fondazione Cenci Bolognetti, Sapienza University of Rome, 00185 Rome, Italy
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Abstract
The formation of bacterial biofilm on implanted devices or damaged tissues leads to biomaterial-associated infections often resulting in life-threatening diseases and implant failure. It is a challenging process to eradicate biofilms as they are resistant to antimicrobial treatments. Conventional techniques, such as high heat and chemicals exposure, may not be suitable for biofilm removal in nosocomial settings. These techniques create surface degradation on the treated materials and lead to environmental pollution due to the use of toxic chemicals. A novel technique known as non-thermal plasma has a great potential to decontaminate or sterilize those nosocomial biofilms. This article aims to provide readers with an extensive review of non-thermal plasma and biofilms to facilitate further investigations. A brief introduction summarizes the problem caused by biofilms in hospital settings with current techniques used for biofilm inactivation followed by the literature review strategy. The remainder of the review discusses plasma and its generation, the role played by plasma reactive species, various factors affecting the antimicrobial efficacy of non-thermal plasma and summarizes many studies published in the field.
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66
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Meuskens I, Saragliadis A, Leo JC, Linke D. Type V Secretion Systems: An Overview of Passenger Domain Functions. Front Microbiol 2019; 10:1163. [PMID: 31214135 PMCID: PMC6555100 DOI: 10.3389/fmicb.2019.01163] [Citation(s) in RCA: 93] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 05/07/2019] [Indexed: 12/12/2022] Open
Abstract
Bacteria secrete proteins for different purposes such as communication, virulence functions, adhesion to surfaces, nutrient acquisition, or growth inhibition of competing bacteria. For secretion of proteins, Gram-negative bacteria have evolved different secretion systems, classified as secretion systems I through IX to date. While some of these systems consist of multiple proteins building a complex spanning the cell envelope, the type V secretion system, the subject of this review, is rather minimal. Proteins of the Type V secretion system are often called autotransporters (ATs). In the simplest case, a type V secretion system consists of only one polypeptide chain with a β-barrel translocator domain in the membrane, and an extracellular passenger or effector region. Depending on the exact domain architecture of the protein, type V secretion systems can be further separated into sub-groups termed type Va through e, and possibly another recently identified subtype termed Vf. While this classification works well when it comes to the architecture of the proteins, this is not the case for the function(s) of the secreted passenger. In this review, we will give an overview of the functions of the passengers of the different AT classes, shedding more light on the variety of functions carried out by type V secretion systems.
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Affiliation(s)
| | | | | | - Dirk Linke
- Department of Biosciences, Section for Genetics and Evolutionary Biology, University of Oslo, Oslo, Norway
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67
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Smith DE, Dhinojwala A, Moore FBG. Effect of Substrate and Bacterial Zeta Potential on Adhesion of Mycobacterium smegmatis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:7035-7042. [PMID: 31035758 DOI: 10.1021/acs.langmuir.8b03920] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Bacterial adhesion is described as a multistep process of interactions between microbes and the substrate, beginning with reversible contact, followed by irreversible adhesion. We explore the influence of substrate zeta potential on adhesion of Mycobacterium smegmatis, a nonpathogenic bacterial model for tuberculosis-causing Mycobacterium tuberculosis and a common foulant of reverse osmosis filtration systems. Substrates having a range of zeta potentials were prepared by coating silica with the polycation, poly(diallyldimethyl ammonium chloride) (pDADMAC), by adjusting the pH of alumina, a pH-responsive material, and by coating silica with a hydrophobic self-assembled monolayer coating of octadecyltrichlorosilane. Our observations using these surfaces demonstrated that adhesion of M. smegmatis increased significantly by more than 200% on the silica-pDADMAC system and more than 300% on alumina substrates, as zeta potential became less negative, and that the variation of pH did not affect adhesion on alumina surfaces. Live and heat-killed bacteria were studied to investigate the contribution of biological response to adhesion with respect to zeta potential. While approximately 60% fewer heat-killed M. smegmatis adhered to pDADMAC-coated silica substrates, the trend of significantly increasing adhesion with less negative zeta potential was still observed. These results show the influence of zeta potential on adhesion of M. smegmatis, which is a separate process from that of the biological response. Across the range of substrate surface chemistries, hydrophobicities, and zeta potentials tested, adhesion of M. smegmatis can primarily be controlled by zeta potential. The bacterial zeta potential was not changed by the various experimental conditions and was -28.3 ± 2.4 mV.
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68
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Huang K, Dou F, Nitin N. Biobased Sanitizer Delivery System for Improved Sanitation of Bacterial and Fungal Biofilms. ACS APPLIED MATERIALS & INTERFACES 2019; 11:17204-17214. [PMID: 30997985 DOI: 10.1021/acsami.9b02428] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Biofilms can persist in food-processing environments because of their relatively higher tolerance and resistance to antimicrobials including sanitizers. In this study, a novel biobased sanitizer composition was developed to effectively target biofilms and deliver chlorine-based sanitizers to inactivate bacterial and fungal biofilms. The biobased composition was developed by encapsulating a chlorine-binding polymer in a biobased yeast cell wall particle (YCWP) microcarrier. This study demonstrates the high affinity of biobased compositions to bind target bacterial and fungal cells and inactivate 5 logs of model pathogenic bacteria and fungi in wash water without and with high organic load (chemical oxygen demand = 2000 mg/L) in 30 s and 5 min, respectively. For the sanitation of biofilms, this biobased sanitizer can inactivate 7 logs of pathogenic bacteria and 3 logs of fungi after 1 h treatment, whereas the 1 h treatment using conventional chlorine-based sanitizer can only achieve 2-3 log reduction for bacterial biofilms and 1-2 log reduction for fungal biofilms, respectively. The enhanced antimicrobial activity can be attributed to three factors: (a) localized high concentration of chlorine bound on the YCWPs; (b) high affinity of YCWPs to bind diverse microbes; and (c) improved stability in an organic-rich aqueous environment. In summary, these unique attributes of biobased carriers will significantly enhance the sanitation efficacy of biofilms, reduce the persistence and transmission of antimicrobial resistant microbes, limit the use of antimicrobial chemicals, and improve the cost-effectiveness of sanitizers.
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69
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Rahbar MR, Zarei M, Jahangiri A, Khalili S, Nezafat N, Negahdaripour M, Fattahian Y, Ghasemi Y. Trimeric autotransporter adhesins in Acinetobacter baumannii, coincidental evolution at work. INFECTION GENETICS AND EVOLUTION 2019; 71:116-127. [PMID: 30922803 DOI: 10.1016/j.meegid.2019.03.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 02/27/2019] [Accepted: 03/23/2019] [Indexed: 12/20/2022]
Abstract
Trimeric autotransporter (TAA), also known as type Vc secretion system, is expressed by many strains of Acinetobacter baumannii, an opportunistic pathogen, which is responsible for nosocomial infections worldwide. TAAs, are modular homotrimeric virulence factors, containing a signal peptide, complex stalk, and conserved membrane anchoring domain. The evolutionary mechanisms underlying the evolvement of these adhesins are not clear. Here, we showed that TAA genes were laterally acquired and underwent gene duplication and recombination. The heterogeneity of TAA nucleotide sequences, GC content, codon usage, and the probability of recombination and duplication events were assessed by MEGA7. Given the heterogeneity of sequences, we used all-against-all BLAST for clustering the TAAs. The pattern of distribution of TAAs are highly scattered; GC content and codon usage for these genes are variable. Multiple events of lateral gene transfer from the early history of Acinetobacter and the occurrence of gene duplication, gene loss, and recombination after acquiring the alien genes may explain the scattered pattern of distribution of TAAs. Additionally, this gene is not present in many clinical isolates of A. baumannii, thus is not a single virulence factor attributing to the infection. The advantage of harboring such genes might be adopting to different environments by developing the biofilm communities. We suggested that TAA genes were laterally acquired in the environmental context and incidentally provided some benefits at the infection site. Thus, coincidental evolution theory may be better suited for describing the evolution of TAA genes in A. baumannii genomes.
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Affiliation(s)
- Mohammad Reza Rahbar
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mahboubeh Zarei
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Abolfazl Jahangiri
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Saeed Khalili
- Department of Biology Sciences, Shahid Rajaee Teacher Training University, Tehran, Iran
| | - Navid Nezafat
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Pharmaceutical Biotechnology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Manica Negahdaripour
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Pharmaceutical Biotechnology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Yaser Fattahian
- Department of Biotechnology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
| | - Younes Ghasemi
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Pharmaceutical Biotechnology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran.
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70
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Burgess BA. Prevention and surveillance of surgical infections: A review. Vet Surg 2019; 48:284-290. [DOI: 10.1111/vsu.13176] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 01/08/2019] [Accepted: 01/17/2019] [Indexed: 01/03/2023]
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71
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Filion-Côté S, Melaine F, Kirk AG, Tabrizian M. Monitoring of bacterial film formation and its breakdown with an angular-based surface plasmon resonance biosensor. Analyst 2018; 142:2386-2394. [PMID: 28555681 DOI: 10.1039/c7an00068e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Bacterial biofilms are a leading cause of infection in health-care settings. Surface plasmon resonance (SPR) biosensors stand as valuable tools not only for the detection of biological entities and the characterisation of biomaterials but also as a suitable means to monitor bacterial film formation. This article reports on a proof-of-concept study for the use of an angular-based SPR biosensor for the monitoring of bacterial cell growth and biofilm formation and removal under the effect of different cleaning agents. The benefit of this custom-made SPR instrument is that it records simultaneously both the critical and resonant angles. This provides unique information on the growth of bacterial cells which is otherwise not obtainable with commonly used intensity-based SPR systems. The results clearly showed that a multilayer biofilm can be formed in 48 hours and the steps involved can be monitored in real-time with the SPR instrument through the measurement of the refractive index change and following the evolution in the shape of the SPR curve. The number, the depth and the sharpness of the reflection ripples varied as the film became thicker. Simulation results confirmed that the number of layers of bacteria affected the number of ripples at the critical angle. Real-time monitoring of the film breakdown with three cleaning agents indicated that bleach solution at 4.5% was the most effective in disrupting the biofilm from the gold sensor. Our overall findings suggest that the SPR biosensor with angular modulation presented in this article can perform real-time monitoring of biofilm formation and has the potential to be used as a platform to test the efficiency of disinfectants.
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Affiliation(s)
- Sandrine Filion-Côté
- The Photonic Systems Group, Dept. Electrical and Computer Engineering, McGill University, McConnell Engineering Building, Montréal, H3A 0E9, Canada
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72
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Bacon BA, Liu Y, Kincaid JR, Boon EM. Spectral Characterization of a Novel NO Sensing Protein in Bacteria: NosP. Biochemistry 2018; 57:6187-6200. [PMID: 30272959 DOI: 10.1021/acs.biochem.8b00451] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A novel family of bacterial hemoproteins named NosP has been discovered recently; its members are proposed to function as nitric oxide (NO) responsive proteins involved in bacterial group behaviors such as quorum sensing and biofilm growth and dispersal. Currently, little is known about molecular activation mechanisms in NosP. Here, functional studies were performed utilizing the distinct spectroscopic characteristics associated with the NosP heme cofactor. NosPs from Pseudomonas aeruginosa ( Pa), Vibrio cholerae ( Vc), and Legionella pneumophila ( Lpg) were studied in their ferrous unligated forms as well as their ferrous CO, ferrous NO, and ferric CN adducts. The resonance Raman (rR) data collected on the ferric forms strongly support the existence of a distorted heme cofactor, which is a common feature in NO sensors. The ferrous spectra exhibit a 213 cm-1 feature, which is assigned to the Fe-Nhis stretching mode. The Fe-C and C-O frequencies in the spectra of ferrous CO NosP complexes are inversely correlated with relatively similar frequencies, consistent with a proximal histidine ligand and a relatively hydrophobic environment. The rR spectra obtained for isotopically labeled ferrous NO adducts provide evidence of formation of a 5-coordinate NO complex, resulting from proximal Fe-Nhis cleavage, which is believed to play a role in biological heme-NO signal transduction. Additionally, we found that of the three NosPs studied, Lpg NosP contains the most electropositive ligand binding pocket, while Pa NosP has the most electronegative ligand binding pocket. This pattern is also observed in the measured heme reduction potentials for these three proteins, which may indicate distinct functions for each.
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Affiliation(s)
- Bezalel A Bacon
- Graduate program in Biochemistry and Structural Biology , Stony Brook University , Stony Brook , New York 11790-3400 , United States
| | - Yilin Liu
- Department of Chemistry , Marquette University , Milwaukee , Wisconsin 53233 , United States
| | - James R Kincaid
- Department of Chemistry , Marquette University , Milwaukee , Wisconsin 53233 , United States
| | - Elizabeth M Boon
- Graduate program in Biochemistry and Structural Biology , Stony Brook University , Stony Brook , New York 11790-3400 , United States.,Department of Chemistry and Institute of Chemical Biology and Drug Discovery , Stony Brook University , Stony Brook , New York 11794-3400 , United States
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73
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Barzegar Amiri Olia M, Hancock AN, Schiesser CH, Goerigk L, Wille U. Photophysical insights and guidelines for blue “turn‐on” fluorescent probes for the direct detection of nitric oxide (NO
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) in biological systems. J PHYS ORG CHEM 2018. [DOI: 10.1002/poc.3896] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
| | - Amber N. Hancock
- School of Chemistry Bio21 Institute, The University of Melbourne Parkville Victoria Australia
| | | | - Lars Goerigk
- School of Chemistry The University of Melbourne Parkville Victoria Australia
| | - Uta Wille
- School of Chemistry Bio21 Institute, The University of Melbourne Parkville Victoria Australia
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74
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Wi YM, Patel R. Understanding Biofilms and Novel Approaches to the Diagnosis, Prevention, and Treatment of Medical Device-Associated Infections. Infect Dis Clin North Am 2018; 32:915-929. [PMID: 30241715 DOI: 10.1016/j.idc.2018.06.009] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Treatment of medical device-related infections is challenging and recurrence is common. The main reason for this is that microorganisms adhere to the surfaces of medical devices and enter into a biofilm state in which they display distinct growth rates, structural features, and protection from antimicrobial agents and host immune mechanisms compared with their planktonic counterparts. This article reviews how microorganisms form biofilms and the mechanisms of protection against antimicrobial agents and the host immune system provided by biofilms. Also discussed are innovative strategies for the diagnosis of biofilm-associated infection and novel approaches to treatment and prevention of medical device-associated infections.
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Affiliation(s)
- Yu Mi Wi
- Division of Infectious Diseases, Department of Internal Medicine, Samsung Changwon Hospital, Sungkyunkwan University, 158 palyong-ro, MasanHoiwon-gu, Changwon-si, Gyeongsangnam-do 51353, Korea
| | - Robin Patel
- Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, 200 First Street Southwest, Rochester, MN 55905, USA; Division of Infectious Diseases, Department of Medicine, Mayo Clinic, 200 First Street Southwest, Rochester, MN 55905, USA.
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75
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Zhao X, Liu Z, Liu Z, Meng R, Shi C, Chen X, Bu X, Guo N. Phenotype and RNA-seq-Based transcriptome profiling of Staphylococcus aureus biofilms in response to tea tree oil. Microb Pathog 2018; 123:304-313. [PMID: 30041003 DOI: 10.1016/j.micpath.2018.07.027] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 03/06/2018] [Accepted: 07/20/2018] [Indexed: 01/31/2023]
Abstract
Staphylococcus aureus (S. aureus) is a Gram-positive bacterium that causes a wide range of diseases, including food poisoning. Tea tree oil (TTO), an essential oil distilled from Melaleuca alternifolia, is well-known for its antibacterial activities. TTO effectively inhibited all 19 tested strains of S. aureus biofilm and planktonic cells. Phenotype analyses of S. aureus biofilm cells exposed to TTO were performed by biofilm adhesion assays, eDNA detection and PIA release. RNA sequencing (RNA-seq) was used in our study to elucidate the mechanism of TTO as a potential antibacterial agent to evaluate differentially expressed genes (DEGs) and the functional network in S. aureus ATCC 29213 biofilms. TTO significantly changed (greater than a 2- or less than a 2-fold change) the expression of 304 genes in S. aureus contained in biofilms. The levels of genes related to the glycine, serine and threonine metabolism pathway, purine metabolism pathway, pyrimidine metabolism pathway and amino acid biosynthesis pathway were dramatically changed in the biofilm exposed to TTO. Furthermore, the expression changes identified by RNA-seq analysis were verified by real-time RT-PCR. To the best of our knowledge, this research is the first study to report the phenotype and expression profiles of S. aureus in biofilms exposed to TTO.
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Affiliation(s)
- Xingchen Zhao
- Department of Food Quality and Safety, School of Pharmaceutics and Food Science, Tonghua Normal University, 134000, China
| | - Zonghui Liu
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, 130062, China
| | - Zuojia Liu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, China
| | - Rizeng Meng
- Jilin Entry-Exit Inspection and Quarantine Bureau, Changchun, 130062, China
| | - Ce Shi
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, 130062, China
| | - Xiangrong Chen
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, 130062, China
| | - Xiujuan Bu
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, 130062, China
| | - Na Guo
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, 130062, China.
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76
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Ferro P, Vaz-Moreira I, Manaia CM. Association between gentamicin resistance and stress tolerance in water isolates of Ralstonia pickettii and R. mannitolilytica. Folia Microbiol (Praha) 2018; 64:63-72. [DOI: 10.1007/s12223-018-0632-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 07/09/2018] [Indexed: 12/27/2022]
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77
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Effects of Fine Particulate Matter on Pseudomonas aeruginosa Adhesion and Biofilm Formation In Vitro. BIOMED RESEARCH INTERNATIONAL 2018; 2018:6287932. [PMID: 30069474 PMCID: PMC6057421 DOI: 10.1155/2018/6287932] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 05/09/2018] [Accepted: 05/31/2018] [Indexed: 11/21/2022]
Abstract
Respiratory infections of Pseudomonas aeruginosa are a major cause of mortality and morbidity for hospitalized patients. Fine particulate matter (FPM) is known to have interactions with some bacterial infection in the respiratory system. In this report, we investigate the effect of different concentration of FPM on P. aeruginosa attachment and biofilm formation using in vitro cell culture systems. P. aeruginosa were cultured to form mature biofilms on hydroxyapatite-coated peg and the number of bacteria in the biofilms was enumerated. Morphology of biofilm was imaged with scanning electron microscopy and confocal laser scanning microscopy. Bacterial affinity change to the cell membrane was evaluated with attached colony counting and fluorescence microscopy images. Alteration of bacterial surface hydrophobicity and S100A4 protein concentration were explored as mechanisms of P. aeruginosa adhesion to human cells. There were a concentration-dependent increase of thickness and surface roughness of biofilm mass. P. aeruginosa adherence to respiratory epithelial cells was increased after FPM treatment. Bacterial surface hydrophobicity and S1000A4 protein concentration were increased with proportionally the dose of FPM in media. FPM in the airway could enhance both the adhesion of P. aeruginosa to epithelial cells and biofilm formation. Bacterial surface hydrophobicity and human cell plasma membrane injury are associated with binding of P. aeruginosa on airway epithelial cells and biofilm formation.
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78
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Ku TSN, Walraven CJ, Lee SA. Candida auris: Disinfectants and Implications for Infection Control. Front Microbiol 2018; 9:726. [PMID: 29706945 PMCID: PMC5906573 DOI: 10.3389/fmicb.2018.00726] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 03/28/2018] [Indexed: 01/18/2023] Open
Abstract
Candida auris is a rapidly emerging pathogen and is able to cause severe infections with high mortality rates. It is frequently misidentified in most clinical laboratories, thus requiring more specialized identification techniques. Furthermore, several clinical isolates have been found to be multidrug resistant and there is evidence of nosocomial transmission in outbreak fashion. Appropriate infection control measures will play a major role in controlling the management and spread of this pathogen. Unfortunately, there are very few data available on the effectiveness of disinfectants against C. auris. Chlorine-based products appear to be the most effective for environmental surface disinfection. Other disinfectants, although less effective than chlorine-based products, may have a role as adjunctive disinfectants. A cleaning protocol will also need to be established as the use of disinfectants alone may not be sufficient for maximal decontamination of patient care areas. Furthermore, there are fewer data on the effectiveness of antiseptics against C. auris for patient decolonization and hand hygiene for healthcare personnel. Chlorhexidine gluconate has shown some efficacy in in vitro studies but there are reports of patients with persistent colonization despite twice daily body washes with this disinfectant. Hand hygiene using soap and water, with or without chlorhexidine gluconate, may require the subsequent use of alcohol-based hand sanitizer for maximal disinfection. Further studies will be needed to validate the currently studied disinfectants for use in real-world settings.
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Affiliation(s)
- Tsun S N Ku
- Section of Infectious Disease, New Mexico VA Health Care System, Albuquerque, NM, United States.,Division of Infectious Diseases, Department of Internal Medicine, University of New Mexico Health Science Center, Albuquerque, NM, United States
| | - Carla J Walraven
- College of Pharmacy, University of New Mexico Health Science Center, Albuquerque, NM, United States
| | - Samuel A Lee
- Section of Infectious Disease, New Mexico VA Health Care System, Albuquerque, NM, United States.,Division of Infectious Diseases, Department of Internal Medicine, University of New Mexico Health Science Center, Albuquerque, NM, United States
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79
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The Domestic Kitchen – The ‘Front Line in the Battle Against Foodborne Disease’. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2018. [DOI: 10.22207/jpam.12.1.23] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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80
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Bazant P, Sedlacek T, Kuritka I, Podlipny D, Holcapkova P. Synthesis and Effect of Hierarchically Structured Ag-ZnO Hybrid on the Surface Antibacterial Activity of a Propylene-Based Elastomer Blends. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E363. [PMID: 29494511 PMCID: PMC5872942 DOI: 10.3390/ma11030363] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 02/26/2018] [Accepted: 02/26/2018] [Indexed: 11/24/2022]
Abstract
In this study, a hybrid Ag-ZnO nanostructured micro-filler was synthesized by the drop technique for used in plastic and medical industry. Furthermore, new antibacterial polymer nanocomposites comprising particles of Ag-ZnO up to 5 wt % and a blend of a thermoplastic polyolefin elastomer (TPO) with polypropylene were prepared using twin screw micro-compounder. The morphology and crystalline-phase structure of the hybrid Ag-ZnO nanostructured microparticles obtained was characterized by scanning electron microscopy and powder X-ray diffractometry. The specific surface area of this filler was investigated by means of nitrogen sorption via the Brunauer-Emmet-Teller method. A scanning electron microscope was used to conduct a morphological study of the polymer nanocomposites. Mechanical and electrical testing showed no adverse effects on the function of the polymer nanocomposites either due to the filler utilized or the given processing conditions, in comparison with the neat polymer matrix. The surface antibacterial activity of the compounded polymer nanocomposites was assessed against Escherichia coli ATCC 8739 and Staphylococcus aureus ATCC 6538P, according to ISO 22196:2007 (E). All the materials at virtually every filler-loading level were seen to be efficient against both species of bacteria.
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Affiliation(s)
- Pavel Bazant
- Centre of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
| | - Tomas Sedlacek
- Centre of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
| | - Ivo Kuritka
- Centre of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
| | - David Podlipny
- Centre of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
| | - Pavlina Holcapkova
- Centre of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
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81
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Shi X, Kadiyala U, VanEpps JS, Yau ST. Culture-free bacterial detection and identification from blood with rapid, phenotypic, antibiotic susceptibility testing. Sci Rep 2018; 8:3416. [PMID: 29467368 PMCID: PMC5821834 DOI: 10.1038/s41598-018-21520-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Accepted: 02/06/2018] [Indexed: 02/06/2023] Open
Abstract
The current culture-based approach for the diagnosis of bloodstreams infection is incommensurate with timely treatment and curbing the prevalence of multi-drug resistant organisms (MDROs) due to its long time-to-result. Bloodstream infections typically involve extremely low (e.g., <10 colony-forming unit (CFU)/mL) bacterial concentrations that require a labor-intensive process and as much as 72 hours to yield a diagnosis. Here, we demonstrate a culture-free approach to achieve rapid diagnosis of bloodstream infections. An immuno-detection platform with intrinsic signal current amplification was developed for the ultrasensitive, rapid detection, identification (ID) and antibiotic susceptibility testing (AST) of infections. With its capability of monitoring short-term (1-2 hours) bacterial growth in blood, the platform is able to provide 84-minute simultaneous detection and ID in blood samples below the 10 CFU/mL level and 204-minute AST. The susceptible-intermediate-resistant AST capacity was demonstrated.
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Affiliation(s)
- Xuyang Shi
- Department of Electrical Engineering and Computer Science, Cleveland State University, Cleveland, Ohio, USA
| | - Usha Kadiyala
- Department of Emergency Medicine, University of Michigan, Ann Arbor, Michigan, USA.,Michigan Center for Integrative Research in Critical Care, University of Michigan, Ann Arbor, Michigan, USA.,Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan, USA
| | - J Scott VanEpps
- Department of Emergency Medicine, University of Michigan, Ann Arbor, Michigan, USA. .,Michigan Center for Integrative Research in Critical Care, University of Michigan, Ann Arbor, Michigan, USA. .,Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan, USA.
| | - Siu-Tung Yau
- Department of Electrical Engineering and Computer Science, Cleveland State University, Cleveland, Ohio, USA. .,The Applied Bioengineering Program, Cleveland State University, Cleveland, Ohio, USA.
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82
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Guoqi W, Zhirui L, Song W, Tongtong L, Lihai Z, Licheng Z, Peifu T. Negative pressure wound therapy reduces the motility of Pseudomonas aeruginosa and enhances wound healing in a rabbit ear biofilm infection model. Antonie van Leeuwenhoek 2018; 111:1557-1570. [PMID: 29468490 PMCID: PMC6097727 DOI: 10.1007/s10482-018-1045-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 02/07/2018] [Indexed: 12/25/2022]
Abstract
Pseudomonas aeruginosa motility, virulence factors and biofilms are known to be detrimental to wound healing. The efficacy of negative pressure wound therapy (NPWT) against P. aeruginosa has been little studied, either in vitro or in vivo. The present study evaluated the effect of negative pressure (NP) on P. aeruginosa motility in vitro, and the effect of NPWT on virulence factors and biofilms in vivo. P. aeruginosa motility was quantified under different levels of NP (atmospheric pressure, − 75, − 125, − 200 mmHg) using an in vitro model. Swimming, swarming and twitching motility were significantly inhibited by NP (− 125 and − 200 mmHg) compared with atmospheric pressure (p = 0.05). Virulence factors and biofilm components were quantified in NPWT and gauze treated groups using a rabbit ear biofilm model. Biofilm structure was studied with fluorescence microscopy and scanning electron microscopy. Additionally, viable bacterial counts and histological wound healing parameters were measured. Compared with the control, NPWT treatment resulted in a significant reduction in expression of all virulence factors assayed including exotoxin A, rhamnolipid and elastase (p = 0.01). A significant reduction of biofilm components (eDNA) (p = 0.01) was also observed in the NPWT group. The reduction of biofilm matrix was verified by fluorescence- and scanning electron-microscopy. NPWT lead to better histologic parameters (p = 0.01) and decreased bacterial counts (p = 0.05) compared with the control. NPWT treatment was demonstrated to be an effective strategy to reduce virulence factors and biofilm components, which may explain the increased wound healing observed.
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Affiliation(s)
- Wang Guoqi
- Department of Orthopedics, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing, 100853, People's Republic of China
| | - Li Zhirui
- Department of Orthopedics, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing, 100853, People's Republic of China
| | - Wang Song
- Medical College, Nankai University, Tianjin, 300071, People's Republic of China
| | - Li Tongtong
- Department of Orthopedics, Tianjin Hospital, No. 406 Jiefangnan Road, Tianjin, 300211, People's Republic of China
| | - Zhang Lihai
- Department of Orthopedics, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing, 100853, People's Republic of China
| | - Zhang Licheng
- Department of Orthopedics, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing, 100853, People's Republic of China.
| | - Tang Peifu
- Department of Orthopedics, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing, 100853, People's Republic of China.
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83
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84
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Model of Chronic Equine Endometritis Involving a Pseudomonas aeruginosa Biofilm. Infect Immun 2017; 85:IAI.00332-17. [PMID: 28970274 PMCID: PMC5695105 DOI: 10.1128/iai.00332-17] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Accepted: 09/19/2017] [Indexed: 01/17/2023] Open
Abstract
Bacteria in a biofilm community have increased tolerance to antimicrobial therapy. To characterize the role of biofilms in equine endometritis, six mares were inoculated with lux-engineered Pseudomonas aeruginosa strains isolated from equine uterine infections. Following establishment of infection, the horses were euthanized and the endometrial surfaces were imaged for luminescence to localize adherent lux-labeled bacteria. Samples from the endometrium were collected for cytology, histopathology, carbohydrate analysis, and expression of inflammatory cytokine genes. Tissue-adherent bacteria were present in focal areas between endometrial folds (6/6 mares). The Pel exopolysaccharide (biofilm matrix component) and cyclic di-GMP (biofilm-regulatory molecule) were detected in 6/6 mares and 5/6 mares, respectively, from endometrial samples with tissue-adherent bacteria (P < 0.05). A greater incidence (P < 0.05) of Pel exopolysaccharide was present in samples fixed with Bouin's solution (18/18) than in buffered formalin (0/18), indicating that Bouin's solution is more appropriate for detecting bacteria adherent to the endometrium. There were no differences (P > 0.05) in the number of inflammatory cells in the endometrium between areas with and without tissue-adherent bacteria. Neutrophils were decreased (P < 0.05) in areas surrounding tissue-adherent bacteria compared to those in areas free of adherent bacteria. Gene expression of interleukin-10, an immune-modulatory cytokine, was significantly (P < 0.05) increased in areas of tissue-adherent bacteria compared to that in endometrium absent of biofilm. These findings indicate that P. aeruginosa produces a biofilm in the uterus and that the host immune response is modulated focally around areas with biofilm, but inflammation within the tissue is similar in areas with and without biofilm matrix. Future studies will focus on therapeutic options for elimination of bacterial biofilm in the equine uterus.
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85
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Björling G, Johansson D, Bergström L, Strekalovsky A, Sanchez J, Frostell C, Kalman S. Evaluation of central venous catheters coated with a noble metal alloy-A randomized clinical pilot study of coating durability, performance and tolerability. J Biomed Mater Res B Appl Biomater 2017; 106:2337-2344. [PMID: 29106034 PMCID: PMC6175140 DOI: 10.1002/jbm.b.34041] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 10/08/2017] [Accepted: 10/16/2017] [Indexed: 11/07/2022]
Abstract
The use of Central Venous Catheters (CVCs) commonly results in complications. Coatings with silver or metal alloys can reduce the risk associated with the use of CVC. We have evaluated the durability of a noble metal coated CVC (the Bactiguard Infectious Protection, BIP CVC) and compared with an uncoated CVC for clinical tolerability (Adverse Events, AEs) and performance, in order to create a baseline for a large future study. Patients undergoing major surgery, randomised at a 2:1 ratio to BIP CVC (n = 22) or standard CVC (n = 12), were catheterized 9 ‐ 12 days, respectively. Adverse events, microbial colonization and metal release were measured. Findings: There were no AEs in the BIP CVC‐group, but 5 AEs occurred in 4 patients (1 patient had 2 AEs) in the standard CVC‐group, p = 0.011 (whereof 3 were catheter related). The BIP CVC showed an initial release of coating metals in blood (gold, silver and palladium), which rapidly decreased and were far below Permitted Paily Exposure (PDE) for chronical use. The levels of silver concentration were far below those needed to develop microbial resistance. The performance was equal, and there was no difference concerning microbial colonization, for the two CVCs. Conclusion: In this pilot study the BIP CVC had significantly lower AEs and showed a comparable performance to the standard CVC. The coating was durable throughout the study length (up to 16 days) and toxicological evaluation showed good safety margins. Larger studies are needed. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2337–2344, 2018.
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Affiliation(s)
- Gunilla Björling
- The Swedish Red Cross University College, Stockholm, Sweden.,Danderyd Hospital, Division of Anaesthesia and Intensive Care, Department of Clinical Sciences, Karolinska Institutet, Stockholm, Sweden
| | | | | | - Anton Strekalovsky
- Department Anesthesia and Intensive Care, Karolinska University Hospital Huddinge, Stockholm, Sweden
| | - Javier Sanchez
- Danderyd Hospital, Division of Anaesthesia and Intensive Care, Department of Clinical Sciences, Karolinska Institutet, Stockholm, Sweden.,Bactiguard® AB, Stockholm, Sweden, Sweden
| | - Claes Frostell
- Danderyd Hospital, Division of Anaesthesia and Intensive Care, Department of Clinical Sciences, Karolinska Institutet, Stockholm, Sweden
| | - Sigridur Kalman
- Department Anesthesia and Intensive Care, Karolinska University Hospital Huddinge, Stockholm, Sweden.,CLINTEC, Karolinska Institutet, Stockholm, Sweden
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86
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Fink R, Oder M, Stražar E, Filip S. Efficacy of cleaning methods for the removal of Bacillus cereus biofilm from polyurethane conveyor belts in bakeries. Food Control 2017. [DOI: 10.1016/j.foodcont.2017.05.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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87
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Rahim MI, Babbar A, Lienenklaus S, Pils MC, Rohde M. Degradable magnesium implant-associated infections by bacterial biofilms induce robust localized and systemic inflammatory reactions in a mouse model. Biomed Mater 2017; 12:055006. [DOI: 10.1088/1748-605x/aa7667] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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88
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Polysubstituted 2-aminoimidazoles as anti-biofilm and antiproliferative agents: Discovery of potent lead. Eur J Med Chem 2017; 138:152-169. [DOI: 10.1016/j.ejmech.2017.06.043] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 05/26/2017] [Accepted: 06/23/2017] [Indexed: 12/18/2022]
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89
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Gkana EN, Doulgeraki AI, Chorianopoulos NG, Nychas GJE. Anti-adhesion and Anti-biofilm Potential of Organosilane Nanoparticles against Foodborne Pathogens. Front Microbiol 2017; 8:1295. [PMID: 28744277 PMCID: PMC5504163 DOI: 10.3389/fmicb.2017.01295] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Accepted: 06/27/2017] [Indexed: 12/04/2022] Open
Abstract
Nowadays, modification of surfaces by nanoparticulate coatings is a simple process that may have applications in reducing the prevalence of bacterial cells both on medical devices and food processing surfaces. To this direction, biofilm biological cycle of Salmonella Typhimurium, Listeria monocytogenes, Escherichia coli O157:H7, Staphylococcus aureus, and Yersinia enterocolitica on stainless steel and glass surfaces, with or without nanocoating was monitored. To achieve this, four different commercial nanoparticle compounds (two for each surface) based on organo-functionalized silanes were selected. In total 10 strains of above species (two for each species) were selected to form biofilms on modified or not, stainless steel or glass surfaces, incubated at 37°C for 72 h. Biofilm population was enumerated by bead vortexing-plate counting method at four time intervals (3, 24, 48, and 72 h). Organosilane based products seemed to affect bacterial attachment on the inert surfaces and/or subsequent biofilm formation, but it was highly dependent on the species and material of surfaces involved. Specifically, reduced bacterial adhesion (at 3 h) of Salmonella and E. coli was observed (P < 0.05) in nanocoating glass surfaces in comparison with the control ones. Moreover, fewer Salmonella and Yersinia biofilm cells were enumerated on stainless steel coupons coated with organosilanes, than on non-coated surfaces at 24 h (P < 0.05). This study gives an insight to the efficacy of organosilanes based coatings against biofilm formation of foodborne pathogens, however, further studies are needed to better understand the impact of surface modification and the underlying mechanisms which are involved in this phenomenon.
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Affiliation(s)
- Eleni N. Gkana
- Laboratory of Microbiology and Biotechnology of Foods, Department of Food Science and Human Nutrition, Faculty of Foods, Biotechnology and Development, Agricultural University of AthensAthens, Greece
| | - Agapi I. Doulgeraki
- Laboratory of Microbiology and Biotechnology of Foods, Department of Food Science and Human Nutrition, Faculty of Foods, Biotechnology and Development, Agricultural University of AthensAthens, Greece
- Institute of Technology of Agricultural Products, Hellenic Agricultural Organization-DEMETERAthens, Greece
| | - Nikos G. Chorianopoulos
- Institute of Technology of Agricultural Products, Hellenic Agricultural Organization-DEMETERAthens, Greece
| | - George-John E. Nychas
- Laboratory of Microbiology and Biotechnology of Foods, Department of Food Science and Human Nutrition, Faculty of Foods, Biotechnology and Development, Agricultural University of AthensAthens, Greece
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90
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Gunawan C, Marquis CP, Amal R, Sotiriou GA, Rice SA, Harry EJ. Widespread and Indiscriminate Nanosilver Use: Genuine Potential for Microbial Resistance. ACS NANO 2017; 11:3438-3445. [PMID: 28339182 DOI: 10.1021/acsnano.7b01166] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
In this era of increasing antibiotic resistance, the use of alternative antimicrobials such as silver has become more widespread. Superior antimicrobial activity has been provided through fabrication of silver nanoparticles or nanosilver (NAg), which imparts cytotoxic actions distinct from those of bulk silver. In the wake of the recent discoveries of bacterial resistance to NAg and its rising incorporation in medical and consumer goods such as wound dressings and dietary supplements, we argue that there is an urgent need to monitor the prevalence and spread of NAg microbial resistance. In this Perspective, we describe how the use of NAg in commercially available products facilitates prolonged microorganism exposure to bioavailable silver, which underpins the development of resistance. Furthermore, we advocate for a judicial approach toward NAg use in order to preserve its efficacy and to avoid environmental disruption.
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Affiliation(s)
- Cindy Gunawan
- The iThree Institute, University of Technology Sydney , Sydney, NSW 2007, Australia
| | | | | | - Georgios A Sotiriou
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet , 17177 Stockholm, Sweden
| | | | - Elizabeth J Harry
- The iThree Institute, University of Technology Sydney , Sydney, NSW 2007, Australia
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91
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Igbinosa IH, Beshiru A, Odjadjare EE, Ateba CN, Igbinosa EO. Pathogenic potentials of Aeromonas species isolated from aquaculture and abattoir environments. Microb Pathog 2017; 107:185-192. [PMID: 28365323 DOI: 10.1016/j.micpath.2017.03.037] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 03/21/2017] [Accepted: 03/21/2017] [Indexed: 11/15/2022]
Abstract
The present study elucidated the presence of antibiotics resistance, virulence genes and biofilm potentials among Aeromonas species isolated from abattoir and aquaculture environments in Benin City, Nigeria. A total of 144 wastewater samples were obtained from two independent aquaculture and abattoir environments between May and October 2016. Aeromonas species were isolated on Glutamate Starch Phenol Red (GSP) agar and confirmed using API 20NE kits. Antimicrobial susceptibility profile of the isolates was carried out using standard disc diffusion assay while biofilm potentials were detected by the microtitre plate method and PCR technique was used to detect antibiotics resistance and virulence gene markers. Overall, 32 and 26 Aeromonas species were isolated from the abattoir and aquaculture environments respectively. Isolates from both environments were completely resistant (100%) to penicillin G, ertapenem and tetracycline; whereas aquaculture isolates exhibited absolute sensitivity (100%) towards cefepime. All the virulence gene markers (aerA, hlyA, alt, ast, laf, ascF-G, fla, lip, stx1, and stx2) investigated in this study (except laf) were detected in isolates from both environments. The laf genes were only detected in isolates from abattoir environments. Antibiotics resistant genes including pse, blaTEM and class 1 integron were detected in isolates from both environments. Majority of the isolates (53/58 91.4%) from both environments; demonstrated capacity for biofilm potential. The detection of antibiotic resistance and virulence gene markers as well as biofilm forming ability in Aeromonas species isolated from aquaculture and abattoir environments raise serious public health concern worthy of further investigation.
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Affiliation(s)
- Isoken H Igbinosa
- Department of Environmental Management and Toxicology, Faculty of Life Sciences, University of Benin, Private Mail Bag 1154 Benin City 300001, Nigeria; SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa
| | - Abeni Beshiru
- Applied Microbial Processes & Environmental Health Research Group, Department of Microbiology, Faculty of Life Sciences, University of Benin, Private Mail Bag 1154 Benin City 300001, Nigeria
| | - Emmanuel E Odjadjare
- Environmental, Public Health and Bioresource Microbiology Research Group, Department of Basic Sciences, Benson Idahosa University, PMB 1100, Benin City, Nigeria
| | - Collins N Ateba
- Department of Biological Sciences, Microbiology Division, Faculty of Agriculture Science and Technology, North West University, Mafikeng Campus, Private Bag X2046, Mmabatho 2375 South Africa
| | - Etinosa O Igbinosa
- SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa; Applied Microbial Processes & Environmental Health Research Group, Department of Microbiology, Faculty of Life Sciences, University of Benin, Private Mail Bag 1154 Benin City 300001, Nigeria.
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92
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Abstract
Low concentrations of nitric oxide (NO) modulate varied behaviours in bacteria including biofilm dispersal and quorum sensing-dependent light production. H-NOX (haem-nitric oxide/oxygen binding) is a haem-bound protein domain that has been shown to be involved in mediating these bacterial responses to NO in several organisms. However, many bacteria that respond to nanomolar concentrations of NO do not contain an annotated H-NOX domain. Nitric oxide sensing protein (NosP), a newly discovered bacterial NO-sensing haemoprotein, may fill this role. The focus of this review is to discuss structure, ligand binding, and activation of H-NOX proteins, as well as to discuss the early evidence for NO sensing and regulation by NosP domains. Further, these findings are connected to the regulation of bacterial biofilm phenotypes and symbiotic relationships.
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Affiliation(s)
- Bezalel Bacon
- Stony Brook University, Stony Brook, NY, United States
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93
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Watkins LM, Lee AF, Moir JWB, Wilson K. Plasma-Generated Poly(allyl alcohol) Antifouling Coatings for Cellular Attachment. ACS Biomater Sci Eng 2017; 3:88-94. [PMID: 33429685 DOI: 10.1021/acsbiomaterials.6b00705] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Conformal poly(allyl alcohol) (PAA) coatings were grown on a biomedical grade polyurethane scaffold using pulsed plasma polymerization of the allyl alcohol monomer. The creation of a continuous wave polymer primer layer increases the interfacial adhesion and stability of a subsequent pulsed plasma deposited PAA film. The resulting PAA coatings are strongly hydrophilic and stable following 7 days incubation in biological media. Films prepared through this energy-efficient, two-step process promote human dermal fibroblast cell culture, while resisting E. coli biofilm formation.
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Affiliation(s)
| | - Adam F Lee
- European Bioenergy Research Institute, Aston University, Aston Triangle, Birmingham B4 7ET, United Kingdom
| | | | - Karen Wilson
- European Bioenergy Research Institute, Aston University, Aston Triangle, Birmingham B4 7ET, United Kingdom
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94
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HIROTA K, SASAKI H, KEITOKU F, MIYAKE Y. Isosorbide Concentration Alters the Bacteria-Repellent Effect of an Isosorbide Polycarbonate. KOBUNSHI RONBUNSHU 2017. [DOI: 10.1295/koron.2017-0018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Katsuhiko HIROTA
- Departments of Oral Microbiology, Institute of Biomedical Sciences, Tokushima University Graduate School
| | - Haruo SASAKI
- Mitsubishi Chemical Corporation Bioplastics Development Section Technology Center Performance Polymers Department
| | - Fumio KEITOKU
- Mitsubishi Chemical Corporation Advanced Product Laboratory R&D Center
| | - Yoichiro MIYAKE
- Departments of Oral Microbiology, Institute of Biomedical Sciences, Tokushima University Graduate School
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95
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Rosenbaum J, Versace DL, Abbad-Andallousi S, Pires R, Azevedo C, Cénédese P, Dubot P. Antibacterial properties of nanostructured Cu–TiO2surfaces for dental implants. Biomater Sci 2017; 5:455-462. [DOI: 10.1039/c6bm00868b] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of copper derived TiO2surfaces (nCu–nT-TiO2) on the death of nosocomialStaphylococcus aureus(Sa) andEscherichia coli(Ec), was investigated.
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Affiliation(s)
| | - Davy Louis Versace
- Institut de Chimie et des Matériaux de Paris-Est
- Université Paris-Est
- CNRS
- Thiais
- UMR7182
| | | | - Remi Pires
- Institut de Chimie et des Matériaux de Paris-Est
- Université Paris-Est
- CNRS
- Thiais
- UMR7182
| | | | - Pierre Cénédese
- Institut de Chimie et des Matériaux de Paris-Est
- Université Paris-Est
- CNRS
- Thiais
- UMR7182
| | - Pierre Dubot
- Institut de Chimie et des Matériaux de Paris-Est
- Université Paris-Est
- CNRS
- Thiais
- UMR7182
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96
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Kirillova A, Marschelke C, Friedrichs J, Werner C, Synytska A. Hybrid Hairy Janus Particles as Building Blocks for Antibiofouling Surfaces. ACS APPLIED MATERIALS & INTERFACES 2016; 8:32591-32603. [PMID: 27933847 DOI: 10.1021/acsami.6b10588] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Herein, we report a new strategy for the design of antifouling surfaces by using hybrid hairy Janus particles. The amphiphilic Janus particles possess either a spherical or a plateletlike shape and have core-shell structures with an inorganic core and hydrophilic/hydrophobic polymeric shells. Subsequently, these bifunctional Janus particles enable the fabrication of surfaces with modularity in chemical composition and final surface topography, which possess antifouling properties. The antifouling and fouling-release capability of the composite Janus particle-based surfaces is investigated using the marine biofilm-forming bacteria Cobetia marina. The Janus particle-based coatings are robust and significantly reduce bacterial retention under both static and dynamic conditions independent of the particle geometry. The plateletlike (kaolinite-based) Janus particles represent a scalable system for the rational design of antifouling coatings as well as their large-scale production and application in the future.
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Affiliation(s)
- Alina Kirillova
- Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Strasse 6, 01069 Dresden, Germany
- Technische Universität Dresden , Fakultät Mathematik und Naturwissenschaften, 01062 Dresden, Germany
| | - Claudia Marschelke
- Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Strasse 6, 01069 Dresden, Germany
- Technische Universität Dresden , Fakultät Mathematik und Naturwissenschaften, 01062 Dresden, Germany
| | - Jens Friedrichs
- Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Strasse 6, 01069 Dresden, Germany
- Technische Universität Dresden , Fakultät Mathematik und Naturwissenschaften, 01062 Dresden, Germany
| | - Carsten Werner
- Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Strasse 6, 01069 Dresden, Germany
- Technische Universität Dresden , Fakultät Mathematik und Naturwissenschaften, 01062 Dresden, Germany
| | - Alla Synytska
- Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Strasse 6, 01069 Dresden, Germany
- Technische Universität Dresden , Fakultät Mathematik und Naturwissenschaften, 01062 Dresden, Germany
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97
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Di Domenico EG, Toma L, Provot C, Ascenzioni F, Sperduti I, Prignano G, Gallo MT, Pimpinelli F, Bordignon V, Bernardi T, Ensoli F. Development of an in vitro Assay, Based on the BioFilm Ring Test ®, for Rapid Profiling of Biofilm-Growing Bacteria. Front Microbiol 2016; 7:1429. [PMID: 27708625 PMCID: PMC5030256 DOI: 10.3389/fmicb.2016.01429] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 08/29/2016] [Indexed: 01/05/2023] Open
Abstract
Microbial biofilm represents a major virulence factor associated with chronic and recurrent infections. Pathogenic bacteria embedded in biofilms are highly resistant to environmental and chemical agents, including antibiotics and therefore difficult to eradicate. Thus, reliable tests to assess biofilm formation by bacterial strains as well as the impact of chemicals or antibiotics on biofilm formation represent desirable tools for a most effective therapeutic management and microbiological risk control. Current methods to evaluate biofilm formation are usually time-consuming, costly, and hardly applicable in the clinical setting. The aim of the present study was to develop and assess a simple and reliable in vitro procedure for the characterization of biofilm-producing bacterial strains for future clinical applications based on the BioFilm Ring Test® (BRT) technology. The procedure developed for clinical testing (cBRT) can provide an accurate and timely (5 h) measurement of biofilm formation for the most common pathogenic bacteria seen in clinical practice. The results gathered by the cBRT assay were in agreement with the traditional crystal violet (CV) staining test, according to the κ coefficient test (κ = 0.623). However, the cBRT assay showed higher levels of specificity (92.2%) and accuracy (88.1%) as compared to CV. The results indicate that this procedure offers an easy, rapid and robust assay to test microbial biofilm and a promising tool for clinical microbiology.
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Affiliation(s)
- Enea G Di Domenico
- Clinical Pathology and Microbiology Department, San Gallicano Institute, Istituti di Ricovero e Cura a Carattere Scientifico Rome, Italy
| | - Luigi Toma
- Infectious Disease Consultant, San Gallicano Institute, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Rome, Italy
| | - Christian Provot
- BioFilm Control, Biopole Clermont Limagne Saint Beauzire, France
| | - Fiorentina Ascenzioni
- Department of Biology and Biotechnology C. Darwin, Sapienza University of Rome Rome, Italy
| | - Isabella Sperduti
- Biostatistics, San Gallicano Institute, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Rome, Italy
| | - Grazia Prignano
- Clinical Pathology and Microbiology Department, San Gallicano Institute, Istituti di Ricovero e Cura a Carattere Scientifico Rome, Italy
| | - Maria T Gallo
- Clinical Pathology and Microbiology Department, San Gallicano Institute, Istituti di Ricovero e Cura a Carattere Scientifico Rome, Italy
| | - Fulvia Pimpinelli
- Clinical Pathology and Microbiology Department, San Gallicano Institute, Istituti di Ricovero e Cura a Carattere Scientifico Rome, Italy
| | - Valentina Bordignon
- Clinical Pathology and Microbiology Department, San Gallicano Institute, Istituti di Ricovero e Cura a Carattere Scientifico Rome, Italy
| | - Thierry Bernardi
- BioFilm Control, Biopole Clermont Limagne Saint Beauzire, France
| | - Fabrizio Ensoli
- Clinical Pathology and Microbiology Department, San Gallicano Institute, Istituti di Ricovero e Cura a Carattere Scientifico Rome, Italy
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98
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Abstract
Nitric oxide (NO) is a freely diffusible, radical gas that has now been established as an integral signaling molecule in eukaryotes and bacteria. It has been demonstrated that NO signaling is initiated upon ligation to the heme iron of an H-NOX domain in mammals and in some bacteria. Bacterial H-NOX proteins have been found to interact with enzymes that participate in signaling pathways and regulate bacterial processes such as quorum sensing, biofilm formation, and symbiosis. Here, we review the biochemical characterization of these signaling pathways and, where available, describe how ligation of NO to H-NOX specifically regulates the activity of these pathways and their associated bacterial phenotypes.
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Affiliation(s)
- Lisa-Marie Nisbett
- Graduate Program in Biochemistry and Structural Biology, Stony Brook University, Stony Brook, NY, 11794-3400
| | - Elizabeth M. Boon
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794-3400
- Institute of Chemical Biology & Drug Discovery, Stony Brook University, Stony Brook, NY, 11794-3400
- Graduate Program in Biochemistry and Structural Biology, Stony Brook University, Stony Brook, NY, 11794-3400
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99
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Influence of Silver-hydroxyapatite Nanocomposite Coating on Biofilm Formation of Joint Prosthesis and Its Mechanism. W INDIAN MED J 2016; 64:506-513. [PMID: 27400164 DOI: 10.7727/wimj.2016.179] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 02/08/2016] [Indexed: 01/04/2023]
Abstract
Background The main reason for biomaterial related refractory infections is biofilm formation caused by bacterial adhesion on the surface of materials. Silver-hydroxyapatite (Ag/HA) nanocomposite coating can inhibit the formation of biofilm, but its mechanism is not clear. Material and method In order to clarify the mechanism, the amounts of biofilm on the Ag/HA composite coating and HA coating were determined, the release rates of silver nanoparticles in simulated body fluid (SBF) were detected by atomic absorption spectrometry, and the expression values of atlE, fbe, sap, iapB genes of Staphylococcus aureus were studied when they grew on Ag/HA composite coating and HA coating. Results The amount of the biofilm on the Ag/HA composite coating was significantly less than that on the HA coating, and the bacterial adhesion was decreased. The silver nanoparticles were released continuously in SBF and the release rate decreased gradually with time. The expression values of atlE, fbe and sap were high in the initial stage of adhesion and the expression value of iapB was high in the colonies-gathering stage in the control group, but they were all significantly inhibited in the presence of Ag. Conclusion These results indicated that the main antibacterial effect of Ag/HA composite coating was achieved by the release of silver nanoparticles. The addition of Ag inhibited the expression of genes related to biofilm formation, which in turn inhibited the formation of biofilms. This provided theoretical support for the clinical application of Ag/HA composite coating.
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100
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Miquel S, Lagrafeuille R, Souweine B, Forestier C. Anti-biofilm Activity as a Health Issue. Front Microbiol 2016; 7:592. [PMID: 27199924 PMCID: PMC4845594 DOI: 10.3389/fmicb.2016.00592] [Citation(s) in RCA: 131] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 04/11/2016] [Indexed: 12/13/2022] Open
Abstract
The formation and persistence of surface-attached microbial communities, known as biofilms, are responsible for 75% of human microbial infections (National Institutes of Health). Biofilm lifestyle confers several advantages to the pathogens, notably during the colonization process of medical devices and/or patients’ organs. In addition, sessile bacteria have a high tolerance to exogenous stress including anti-infectious agents. Biofilms are highly competitive communities and some microorganisms exhibit anti-biofilm capacities such as bacterial growth inhibition, exclusion or competition, which enable them to acquire advantages and become dominant. The deciphering and control of anti-biofilm properties represent future challenges in human infection control. The aim of this review is to compare and discuss the mechanisms of natural bacterial anti-biofilm strategies/mechanisms recently identified in pathogenic, commensal and probiotic bacteria and the main synthetic strategies used in clinical practice, particularly for catheter-related infections.
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Affiliation(s)
- Sylvie Miquel
- Laboratoire Microorganismes : Génome et Environnement - UMR, CNRS 6023, Université Clermont Auvergne Clermont-Ferrand, France
| | - Rosyne Lagrafeuille
- Laboratoire Microorganismes : Génome et Environnement - UMR, CNRS 6023, Université Clermont Auvergne Clermont-Ferrand, France
| | - Bertrand Souweine
- Laboratoire Microorganismes : Génome et Environnement - UMR, CNRS 6023, Université Clermont AuvergneClermont-Ferrand, France; Service de Réanimation Médicale Polyvalente, CHU de Clermont-Ferrand, Clermont-FerrandFrance
| | - Christiane Forestier
- Laboratoire Microorganismes : Génome et Environnement - UMR, CNRS 6023, Université Clermont Auvergne Clermont-Ferrand, France
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