201
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Becraft ED, Wood JM, Cohan FM, Ward DM. Biogeography of American Northwest Hot Spring A/B '-Lineage Synechococcus Populations. Front Microbiol 2020; 11:77. [PMID: 32153516 PMCID: PMC7050468 DOI: 10.3389/fmicb.2020.00077] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 01/15/2020] [Indexed: 12/17/2022] Open
Abstract
Previous analyses have shown how diversity among unicellular cyanobacteria inhabiting island-like hot springs is structured relative to physical separation and physiochemical differences among springs, especially at local to regional scales. However, these studies have been limited by the low resolution provided by the molecular markers surveyed. We analyzed large datasets obtained by high-throughput sequencing of a segment of the photosynthesis gene psaA from samples collected in hot springs from geothermal basins in Yellowstone National Park, Montana, and Oregon, all known from previous studies to contain populations of A/B'-lineage Synechococcus. The fraction of identical sequences was greater among springs separated by <50 km than among springs separated by >50 km, and springs separated by >800 km shared sequence variants only rarely. Phylogenetic analyses provided evidence for endemic lineages that could be related to geographic isolation and/or geochemical differences on regional scales. Ecotype Simulation 2 was used to predict putative ecotypes (ecologically distinct populations), and their membership, and canonical correspondence analysis was used to examine the geographical and geochemical bases for variation in their distribution. Across the range of Oregon and Yellowstone, geographical separation explained the largest percentage of the differences in distribution of ecotypes (9.5% correlated to longitude; 9.4% to latitude), with geochemical differences explaining the largest percentage of the remaining differences in distribution (7.4-9.3% correlated to magnesium, sulfate, and sulfide). Among samples within the Greater Yellowstone Ecosystem, geochemical differences significantly explained the distribution of ecotypes (6.5-9.3% correlated to magnesium, boron, sulfate, silicon dioxide, chloride, and pH). Nevertheless, differences in the abundance and membership of ecotypes in Yellowstone springs with similar chemistry suggested that allopatry may be involved even at local scales. Synechococcus populations have diverged both by physical isolation and physiochemical differences, and populations on surprisingly local scales have been evolving independently.
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Affiliation(s)
- Eric D Becraft
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, United States.,Department of Biology, University of North Alabama, Florence, AL, United States
| | - Jason M Wood
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, United States.,Biotechnology and Planetary Protection Group, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
| | - Frederick M Cohan
- Department of Biology, Wesleyan University, Middletown, CT, United States
| | - David M Ward
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, United States
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202
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Nicastro GG, Kaihami GH, Pulschen AA, Hernandez-Montelongo J, Boechat AL, de Oliveira Pereira T, Rosa CGT, Stefanello E, Colepicolo P, Bordi C, Baldini RL. c-di-GMP-related phenotypes are modulated by the interaction between a diguanylate cyclase and a polar hub protein. Sci Rep 2020; 10:3077. [PMID: 32080219 PMCID: PMC7033161 DOI: 10.1038/s41598-020-59536-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 01/30/2020] [Indexed: 01/19/2023] Open
Abstract
c-di-GMP is a major player in the switch between biofilm and motile lifestyles. Several bacteria exhibit a large number of c-di-GMP metabolizing proteins, thus a fine-tuning of this nucleotide levels may occur. It is hypothesized that some c-di-GMP metabolizing proteins would provide the global c-di-GMP levels inside the cell whereas others would maintain a localized pool, with the resulting c-di-GMP acting at the vicinity of its production. Although attractive, this hypothesis has yet to be demonstrated in Pseudomonas aeruginosa. We found that the diguanylate cyclase DgcP interacts with the cytosolic region of FimV, a polar peptidoglycan-binding protein involved in type IV pilus assembly. Moreover, DgcP is located at the cell poles in wild type cells but scattered in the cytoplasm of cells lacking FimV. Overexpression of dgcP leads to the classical phenotypes of high c-di-GMP levels (increased biofilm and impaired motilities) in the wild-type strain, but not in a ΔfimV background. Therefore, our findings suggest that DgcP activity is regulated by FimV. The polar localization of DgcP might contribute to a local c-di-GMP pool that can be sensed by other proteins at the cell pole, bringing to light a specialized function for a specific diguanylate cyclase.
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Affiliation(s)
- Gianlucca G Nicastro
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Gilberto H Kaihami
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - André A Pulschen
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Jacobo Hernandez-Montelongo
- Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Campinas, Brazil
- Departamento de Ciencias Matemáticas y Físicas, Facultad de Ingeniería, Universidad Católica de Temuco, Temuco, Chile
| | - Ana Laura Boechat
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | | | - Caio Gomes Tavares Rosa
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Eliezer Stefanello
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Pio Colepicolo
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | | | - Regina L Baldini
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil.
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203
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de Oliveira Júnior NG, Franco OL. Promising strategies for future treatment of Klebsiella pneumoniae biofilms. Future Microbiol 2020; 15:63-79. [PMID: 32048525 DOI: 10.2217/fmb-2019-0180] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Klebsiella pneumoniae is a Gram-negative pathogenic bacterium that has the ability to aggregate as biofilm, representing one of the main agents in hospital infections, showing high rates of resistance to antibiotics. The K. pneumoniae biofilm aggregates are composed mainly of extracellular polysaccharides, eDNA and proteins. Besides, biofilms can attach to medical devices, such as endotracheal tubes and catheters, but are most dangerous on body surfaces. Here, we discuss the recent findings about the resistance mechanisms of K. pneumoniae biofilms, including genes and protein involved in 'classic', multidrug-resistant and hypervirulent strains, and also virulence factors. In addition, we also explore new strategies for possible treatment of these biofilms, and recently discovered molecules which may lead to future treatments.
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Affiliation(s)
- Nelson G de Oliveira Júnior
- Centro de Análises Proteômicas e Bioquímicas, Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, Brazil.,S-inova Biotech, Programa de Pós-Graduação em Biotecnologia, Universidade Católica Dom Bosco, Campo Grande, MS 79117-900, Brazil
| | - Octávio L Franco
- Centro de Análises Proteômicas e Bioquímicas, Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, Brazil.,S-inova Biotech, Programa de Pós-Graduação em Biotecnologia, Universidade Católica Dom Bosco, Campo Grande, MS 79117-900, Brazil
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204
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Hwang SH, Park JH, Lee B, Choi SH. A Regulatory Network Controls cabABC Expression Leading to Biofilm and Rugose Colony Development in Vibrio vulnificus. Front Microbiol 2020; 10:3063. [PMID: 32010109 PMCID: PMC6978666 DOI: 10.3389/fmicb.2019.03063] [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: 11/01/2019] [Accepted: 12/18/2019] [Indexed: 12/19/2022] Open
Abstract
Biofilms provide bacteria with protection from environmental stresses and host immune defenses. The pathogenic marine bacterium Vibrio vulnificus forms biofilms and colonizes environmental niches such as oysters. The cabABC operon encodes an extracellular matrix protein CabA and the corresponding type I secretion system, which are essential for biofilm and rugose colony development of V. vulnificus. In this study, molecular biological analyses revealed the roles of three transcriptional regulators BrpR, BrpT, and BrpS in the regulatory pathway for the cabABC operon. BrpR induces brpT and BrpT in turn activates the cabABC operon in a sequential cascade, contributing to development of robust biofilm structures. BrpT also activates brpS, but BrpS represses brpT, constituting a negative feedback loop that stabilizes brpT expression. BrpT and BrpS directly bind to specific sequences upstream of cabA, and they constitute a feedforward loop in which BrpT induces brpS and together with BrpS activates cabABC, leading to precise regulation of cabABC expression. Accordingly, BrpS as well as BrpT plays a crucial role in complete development of rugose colonies. This elaborate network of three transcriptional regulators BrpR, BrpT, and BrpS thus tightly controls cabABC regulation, and contributes to successful development of robust biofilms and rugose colonies in V. vulnificus.
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Affiliation(s)
- Seung-Ho Hwang
- National Research Laboratory of Molecular Microbiology and Toxicology, Center for Food Safety and Toxicology, Department of Agricultural Biotechnology, Seoul National University, Seoul, South Korea
| | - Jin Hwan Park
- National Research Laboratory of Molecular Microbiology and Toxicology, Center for Food Safety and Toxicology, Department of Agricultural Biotechnology, Seoul National University, Seoul, South Korea
| | - Byungho Lee
- National Research Laboratory of Molecular Microbiology and Toxicology, Center for Food Safety and Toxicology, Department of Agricultural Biotechnology, Seoul National University, Seoul, South Korea
| | - Sang Ho Choi
- National Research Laboratory of Molecular Microbiology and Toxicology, Center for Food Safety and Toxicology, Department of Agricultural Biotechnology, Seoul National University, Seoul, South Korea
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205
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Olivares E, Badel-Berchoux S, Provot C, Prévost G, Bernardi T, Jehl F. Clinical Impact of Antibiotics for the Treatment of Pseudomonas aeruginosa Biofilm Infections. Front Microbiol 2020; 10:2894. [PMID: 31998248 PMCID: PMC6962142 DOI: 10.3389/fmicb.2019.02894] [Citation(s) in RCA: 95] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 12/02/2019] [Indexed: 02/03/2023] Open
Abstract
Bacterial biofilms are highly recalcitrant to antibiotic therapies due to multiple tolerance mechanisms. The involvement of Pseudomonas aeruginosa in a wide range of biofilm-related infections often leads to treatment failures. Indeed, few current antimicrobial molecules are still effective on tolerant sessile cells. In contrast, studies increasingly showed that conventional antibiotics can, at low concentrations, induce a phenotype change in bacteria and consequently, the biofilm formation. Understanding the clinical effects of antimicrobials on biofilm establishment is essential to avoid the use of inappropriate treatments in the case of biofilm infections. This article reviews the current knowledge about bacterial growth within a biofilm and the preventive or inducer impact of standard antimicrobials on its formation by P. aeruginosa. The effect of antibiotics used to treat biofilms of other bacterial species, as Staphylococcus aureus or Escherichia coli, was also briefly mentioned. Finally, it describes two in vitro devices which could potentially be used as antibiotic susceptibility testing for adherent bacteria.
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Affiliation(s)
- Elodie Olivares
- University of Strasbourg, CHRU Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, EA7290, Institut de Bactériologie, Strasbourg, France.,BioFilm Pharma SAS, Saint-Beauzire, France
| | | | - Christian Provot
- BioFilm Pharma SAS, Saint-Beauzire, France.,BioFilm Control SAS, Saint-Beauzire, France
| | - Gilles Prévost
- University of Strasbourg, CHRU Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, EA7290, Institut de Bactériologie, Strasbourg, France
| | - Thierry Bernardi
- BioFilm Pharma SAS, Saint-Beauzire, France.,BioFilm Control SAS, Saint-Beauzire, France
| | - François Jehl
- University of Strasbourg, CHRU Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, EA7290, Institut de Bactériologie, Strasbourg, France
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206
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Monticolo F, Palomba E, Termolino P, Chiaiese P, de Alteriis E, Mazzoleni S, Chiusano ML. The Role of DNA in the Extracellular Environment: A Focus on NETs, RETs and Biofilms. FRONTIERS IN PLANT SCIENCE 2020; 11:589837. [PMID: 33424885 PMCID: PMC7793654 DOI: 10.3389/fpls.2020.589837] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 11/25/2020] [Indexed: 05/06/2023]
Abstract
The capacity to actively release genetic material into the extracellular environment has been reported for bacteria, archaea, fungi, and in general, for microbial communities, but it is also described in the context of multicellular organisms, animals and plants. This material is often present in matrices that locate outside the cells. Extracellular matrices have important roles in defense response and disease in microbes, animal and plants cells, appearing as barrier against pathogen invasion or for their recognition. Specifically, neutrophils extracellular traps (NETs) in animals and root extracellular traps (RETs) in plants, are recognized to be important players in immunity. A growing amount of evidence revealed that the extracellular DNA, in these contexts, plays an active role in the defense action. Moreover, the protective role of extracellular DNA against antimicrobials and mechanical stress also appears to be confirmed in bacterial biofilms. In parallel, recent efforts highlighted different roles of self (homologous) and non-self (heterologous) extracellular DNA, paving the way to discussions on its role as a "Damage-associated molecular pattern" (DAMP). We here provide an evolutionary overview on extracellular DNA in extracellular matrices like RETs, NETs, and microbial biofilms, discussing on its roles and inferring on possible novel functionalities.
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Affiliation(s)
- Francesco Monticolo
- Department of Agricultural Sciences, Università degli Studi di Napoli Federico II, Portici, Italy
| | - Emanuela Palomba
- Department of Research Infrastructures for Marine Biological Resources, Stazione Zoologica “Anton Dohrn”, Naples, Italy
| | - Pasquale Termolino
- Institute of Biosciences and Bioresources, National Research Council, Portici, Italy
| | - Pasquale Chiaiese
- Department of Agricultural Sciences, Università degli Studi di Napoli Federico II, Portici, Italy
| | | | - Stefano Mazzoleni
- Department of Agricultural Sciences, Università degli Studi di Napoli Federico II, Portici, Italy
| | - Maria Luisa Chiusano
- Department of Agricultural Sciences, Università degli Studi di Napoli Federico II, Portici, Italy
- Department of Research Infrastructures for Marine Biological Resources, Stazione Zoologica “Anton Dohrn”, Naples, Italy
- *Correspondence: Maria Luisa Chiusano,
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207
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Verderosa AD, Dhouib R, Fairfull-Smith KE, Totsika M. Nitroxide Functionalized Antibiotics Are Promising Eradication Agents against Staphylococcus aureus Biofilms. Antimicrob Agents Chemother 2019; 64:e01685-19. [PMID: 31636066 PMCID: PMC7187575 DOI: 10.1128/aac.01685-19] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 10/09/2019] [Indexed: 01/10/2023] Open
Abstract
Treatment of biofilm-related Staphylococcus aureus infections represents an important medical challenge worldwide, as biofilms, even those involving drug-susceptible S. aureus strains, are highly refractory to conventional antibiotic therapy. Nitroxides were recently shown to induce the dispersal of Gram-negative biofilms in vitro, but their action against Gram-positive bacterial biofilms remains unknown. Here, we demonstrate that the biofilm dispersal activity of nitroxides extends to S. aureus, a clinically important Gram-positive pathogen. Coadministration of the nitroxide CTEMPO (4-carboxy-2,2,6,6-tetramethylpiperidin-1-yloxyl) with ciprofloxacin significantly improved the biofilm eradication activity of the antibiotic against S. aureus Moreover, covalently linking the nitroxide to the antibiotic moiety further reduced the ciprofloxacin minimal biofilm eradication concentration. Microscopy analysis revealed that fluorescent nitroxide-antibiotic hybrids could penetrate S. aureus biofilms and enter cells localized at the surface and base of the biofilm structure. No toxicity to human cells was observed for the nitroxide CTEMPO or the nitroxide-antibiotic hybrids. Taken together, our results show that nitroxides can mediate the dispersal of Gram-positive biofilms and that dual-acting biofilm eradication antibiotics may provide broad-spectrum therapies for the treatment of biofilm-related infections.
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Affiliation(s)
- Anthony D Verderosa
- School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland, Australia
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
- School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Rabeb Dhouib
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
- School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Kathryn E Fairfull-Smith
- School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Makrina Totsika
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
- School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia
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208
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Verderosa AD, Totsika M, Fairfull-Smith KE. Bacterial Biofilm Eradication Agents: A Current Review. Front Chem 2019; 7:824. [PMID: 31850313 PMCID: PMC6893625 DOI: 10.3389/fchem.2019.00824] [Citation(s) in RCA: 267] [Impact Index Per Article: 53.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Accepted: 11/12/2019] [Indexed: 12/19/2022] Open
Abstract
Most free-living bacteria can attach to surfaces and aggregate to grow into multicellular communities encased in extracellular polymeric substances called biofilms. Biofilms are recalcitrant to antibiotic therapy and a major cause of persistent and recurrent infections by clinically important pathogens worldwide (e.g., Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus). Currently, most biofilm remediation strategies involve the development of biofilm-inhibition agents, aimed at preventing the early stages of biofilm formation, or biofilm-dispersal agents, aimed at disrupting the biofilm cell community. While both strategies offer some clinical promise, neither represents a direct treatment and eradication strategy for established biofilms. Consequently, the discovery and development of biofilm eradication agents as comprehensive, stand-alone biofilm treatment options has become a fundamental area of research. Here we review our current understanding of biofilm antibiotic tolerance mechanisms and provide an overview of biofilm remediation strategies, focusing primarily on the most promising biofilm eradication agents and approaches. Many of these offer exciting prospects for the future of biofilm therapeutics for a large number of infections that are currently refractory to conventional antibiotics.
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Affiliation(s)
- Anthony D Verderosa
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD, Australia.,School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, Australia.,School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, Australia
| | - Makrina Totsika
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD, Australia.,School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, Australia
| | - Kathryn E Fairfull-Smith
- School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, Australia
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209
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Halicki PCB, Radin V, von Groll A, Nora MV, Pinheiro AC, da Silva PEA, Ramos DF. Antibiofilm Potential of Arenecarbaldehyde 2-Pyridinylhydrazone Derivatives Against Acinetobacter baumannii. Microb Drug Resist 2019; 26:1429-1436. [PMID: 31770073 DOI: 10.1089/mdr.2019.0185] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
In the last 15 years, Acinetobacter baumannii has received special attention, mainly due to several resistance mechanisms and high rates of morbimortality. The ability to form biofilms contributes to the persistence of this microorganism in the hospital environment and facilitates the occurrence of nosocomial infections. Several studies have highlighted the pharmacological relevance of pyridines in the treatment and control of infectious diseases and others have related the anti-A. baumannii potential of hydrazine derivatives. Considering this scenario, we aimed to evaluate the antimicrobial and antibiofilm activity of 10 pyridinylhydrazone compounds against A. baumannii. The minimum inhibitory concentration of the compounds was determined by broth microdilution method and the antibiofilm activity was evaluated by inhibition and destruction biofilm assays. In addition, the cytotoxicity of the compounds in the J774A.1 cell line was also evaluated, and the selectivity index was calculated. Among the 10 pyridine compounds, the compounds B and D were able to inhibit the formation of biofilms and destroy bacterial biofilms even in a concentration of 12.5 μg/mL. Thus, the pyridine compounds evaluated can be a scaffold for the development of new substances with antimicrobial and antibiofilm activity.
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Affiliation(s)
| | - Vanessa Radin
- Núcleo de Pesquisa em Microbiologia Médica (NUPEMM), Faculdade de Medicina da Universidade Federal do Rio Grande, FURG, Rio Grande, Brazil
| | - Andrea von Groll
- Núcleo de Pesquisa em Microbiologia Médica (NUPEMM), Faculdade de Medicina da Universidade Federal do Rio Grande, FURG, Rio Grande, Brazil
| | - Marcus Vinícius Nora
- Fundação Oswaldo Cruz, Instituto De Tecnologia Em Fármacos, Farmanguinhos, Rio De Janeiro, Brazil
| | | | - Pedro Eduardo Almeida da Silva
- Núcleo de Pesquisa em Microbiologia Médica (NUPEMM), Faculdade de Medicina da Universidade Federal do Rio Grande, FURG, Rio Grande, Brazil
| | - Daniela Fernandes Ramos
- Núcleo de Pesquisa em Microbiologia Médica (NUPEMM), Faculdade de Medicina da Universidade Federal do Rio Grande, FURG, Rio Grande, Brazil
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210
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Abstract
Biofilms are surface-associated bacterial communities that play both beneficial and harmful roles in nature, medicine, and industry. Tolerant and persister cells are thought to underlie biofilm-related bacterial recurrence in medical and industrial contexts. Here, we review recent progress aimed at understanding the mechanical features that drive biofilm resilience and the biofilm formation process at single-cell resolution. We discuss findings regarding mechanisms underlying bacterial tolerance and persistence in biofilms and how these phenotypes are linked to antibiotic resistance. New strategies for combatting tolerance and persistence in biofilms and possible methods for biofilm eradication are highlighted to inspire future development.
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211
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Rong F, Tang Y, Wang T, Feng T, Song J, Li P, Huang W. Nitric Oxide-Releasing Polymeric Materials for Antimicrobial Applications: A Review. Antioxidants (Basel) 2019; 8:E556. [PMID: 31731704 PMCID: PMC6912614 DOI: 10.3390/antiox8110556] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 11/07/2019] [Accepted: 11/13/2019] [Indexed: 12/12/2022] Open
Abstract
Polymeric materials releasing nitric oxide have attracted significant attention for therapeutic use in recent years. As one of the gaseous signaling agents in eukaryotic cells, endogenously generated nitric oxide (NO) is also capable of regulating the behavior of bacteria as well as biofilm formation in many metabolic pathways. To overcome the drawbacks caused by the radical nature of NO, synthetic or natural polymers bearing NO releasing moiety have been prepared as nano-sized materials, coatings, and hydrogels. To successfully design these materials, the amount of NO released within a certain duration, the targeted pathogens and the trigger mechanisms upon external stimulation with light, temperature, and chemicals should be taken into consideration. Meanwhile, NO donors like S-nitrosothiols (RSNOs) and N-diazeniumdiolates (NONOates) have been widely utilized for developing antimicrobial polymeric agents through polymer-NO donor conjugation or physical encapsulation. In addition, antimicrobial materials with visible light responsive NO donor are also reported as strong and physiological friendly tools for rapid bacterial clearance. This review highlights approaches to delivery NO from different types of polymeric materials for combating diseases caused by pathogenic bacteria, which hopefully can inspire researchers facing common challenges in the coming 'post-antibiotic' era.
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Affiliation(s)
- Fan Rong
- Xi’an Institute of Flexible Electronics & Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
- Department of Applied Chemistry, School of Natural and Applied Science, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
| | - Yizhang Tang
- Xi’an Institute of Flexible Electronics & Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
- Department of Applied Chemistry, School of Natural and Applied Science, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
| | - Tengjiao Wang
- Xi’an Institute of Flexible Electronics & Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
| | - Tao Feng
- Xi’an Institute of Flexible Electronics & Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
| | - Jiang Song
- Xi’an Institute of Flexible Electronics & Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
- School of Electronics & Information, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
| | - Peng Li
- Xi’an Institute of Flexible Electronics & Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
| | - Wei Huang
- Xi’an Institute of Flexible Electronics & Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an 710072, Shaanxi, China
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212
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Penesyan A, Nagy SS, Kjelleberg S, Gillings MR, Paulsen IT. Rapid microevolution of biofilm cells in response to antibiotics. NPJ Biofilms Microbiomes 2019; 5:34. [PMID: 31728201 PMCID: PMC6834608 DOI: 10.1038/s41522-019-0108-3] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 10/03/2019] [Indexed: 02/08/2023] Open
Abstract
Infections caused by Acinetobacter baumannii are increasingly antibiotic resistant, generating a significant public health problem. Like many bacteria, A. baumannii adopts a biofilm lifestyle that enhances its antibiotic resistance and environmental resilience. Biofilms represent the predominant mode of microbial life, but research into antibiotic resistance has mainly focused on planktonic cells. We investigated the dynamics of A. baumannii biofilms in the presence of antibiotics. A 3-day exposure of A. baumannii biofilms to sub-inhibitory concentrations of antibiotics had a profound effect, increasing biofilm formation and antibiotic resistance in the majority of biofilm dispersal isolates. Cells dispersing from biofilms were genome sequenced to identify mutations accumulating in their genomes, and network analysis linked these mutations to their phenotypes. Transcriptomics of biofilms confirmed the network analysis results, revealing novel gene functions of relevance to both resistance and biofilm formation. This approach is a rapid and objective tool for investigating resistance dynamics of biofilms.
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Affiliation(s)
- Anahit Penesyan
- 1Department of Molecular Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109 Australia.,2School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052 Australia
| | - Stephanie S Nagy
- 1Department of Molecular Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109 Australia
| | - Staffan Kjelleberg
- 3Singapore Centre for Environmental Life Sciences Engineering, 60 Nanyang Drive, SBS-01N-27, Singapore, 637551 Singapore.,4School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551 Singapore.,5School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052 Australia
| | - Michael R Gillings
- 6Department of Biological Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109 Australia
| | - Ian T Paulsen
- 1Department of Molecular Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109 Australia
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213
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Noirot-Gros MF, Forrester S, Malato G, Larsen PE, Noirot P. CRISPR interference to interrogate genes that control biofilm formation in Pseudomonas fluorescens. Sci Rep 2019; 9:15954. [PMID: 31685917 PMCID: PMC6828691 DOI: 10.1038/s41598-019-52400-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 10/12/2019] [Indexed: 12/11/2022] Open
Abstract
Bacterial biofilm formation involves signaling and regulatory pathways that control the transition from motile to sessile lifestyle, production of extracellular polymeric matrix, and maturation of the biofilm 3D structure. Biofilms are extensively studied because of their importance in biomedical, ecological and industrial settings. Gene inactivation is a powerful approach for functional studies but it is often labor intensive, limiting systematic gene surveys to the most tractable bacterial hosts. Here, we adapted the CRISPR interference (CRISPRi) system for use in diverse strain isolates of P. fluorescens, SBW25, WH6 and Pf0-1. We found that CRISPRi is applicable to study complex phenotypes such as cell morphology, motility and biofilm formation over extended periods of time. In SBW25, CRISPRi-mediated silencing of genes encoding the GacA/S two-component system and regulatory proteins associated with the cylic di-GMP signaling messenger produced swarming and biofilm phenotypes similar to those obtained after gene inactivation. Combined with detailed confocal microscopy of biofilms, our study also revealed novel phenotypes associated with extracellular matrix biosynthesis as well as the potent inhibition of SBW25 biofilm formation mediated by the PFLU1114 operon. We conclude that CRISPRi is a reliable and scalable approach to investigate gene networks in the diverse P. fluorescens group.
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Affiliation(s)
| | - Sara Forrester
- Biosciences Division, Argonne National Laboratory, Lemont, IL60439, United States
| | - Grace Malato
- Biosciences Division, Argonne National Laboratory, Lemont, IL60439, United States
| | - Peter E Larsen
- Biosciences Division, Argonne National Laboratory, Lemont, IL60439, United States.,Department of Bioengineering, University of Illinois Chicago, Chicago, IL60607, United States
| | - Philippe Noirot
- Biosciences Division, Argonne National Laboratory, Lemont, IL60439, United States
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214
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Zhang K, Du Y, Si Z, Liu Y, Turvey ME, Raju C, Keogh D, Ruan L, Jothy SL, Reghu S, Marimuthu K, De PP, Ng OT, Mediavilla JR, Kreiswirth BN, Chi YR, Ren J, Tam KC, Liu XW, Duan H, Zhu Y, Mu Y, Hammond PT, Bazan GC, Pethe K, Chan-Park MB. Enantiomeric glycosylated cationic block co-beta-peptides eradicate Staphylococcus aureus biofilms and antibiotic-tolerant persisters. Nat Commun 2019; 10:4792. [PMID: 31636263 PMCID: PMC6803644 DOI: 10.1038/s41467-019-12702-8] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 09/19/2019] [Indexed: 12/11/2022] Open
Abstract
The treatment of bacterial infections is hindered by the presence of biofilms and metabolically inactive persisters. Here, we report the synthesis of an enantiomeric block co-beta-peptide, poly(amido-D-glucose)-block-poly(beta-L-lysine), with high yield and purity by one-shot one-pot anionic-ring opening (co)polymerization. The co-beta-peptide is bactericidal against methicillin-resistant Staphylococcus aureus (MRSA), including replicating, biofilm and persister bacterial cells, and also disperses biofilm biomass. It is active towards community-acquired and hospital-associated MRSA strains which are resistant to multiple drugs including vancomycin and daptomycin. Its antibacterial activity is superior to that of vancomycin in MRSA mouse and human ex vivo skin infection models, with no acute in vivo toxicity in repeated dosing in mice at above therapeutic levels. The copolymer displays bacteria-activated surfactant-like properties, resulting from contact with the bacterial envelope. Our results indicate that this class of non-toxic molecule, effective against different bacterial sub-populations, has promising potential for the treatment of S. aureus infections. The authors report the synthesis of an enantiomeric block co-beta-peptide that kills methicillin-resistant Staphylococcus aureus, including biofilm and persister bacterial cells, and disperses biofilms. The copolymer displays antibacterial activity in human ex vivo and mouse in vivo infection models without toxicity.
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Affiliation(s)
- Kaixi Zhang
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
| | - Yu Du
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, 350002, Fuzhou, China
| | - Zhangyong Si
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
| | - Yang Liu
- Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551, Singapore
| | - Michelle E Turvey
- Infectious Disease Interdisciplinary Research Group, Singapore-MIT Alliance for Research & Technology Centre, 1 Create Way, Singapore, 138602, Singapore
| | - Cheerlavancha Raju
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
| | - Damien Keogh
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
| | - Lin Ruan
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
| | - Subramanion L Jothy
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
| | - Sheethal Reghu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
| | - Kalisvar Marimuthu
- Department of Infectious Diseases, Tan Tock Seng Hospital, 11 Jalan Tan Tock Seng, Singapore, 308433, Singapore.,National Centre for Infectious Diseases, 16 Jalan Tan Tock Seng, Singapore, 308442, Singapore
| | - Partha Pratim De
- Department of Laboratory Medicine, Tan Tock Seng Hospital, 11 Jalan Tan Tock Seng, Singapore, 308433, Singapore
| | - Oon Tek Ng
- Department of Infectious Diseases, Tan Tock Seng Hospital, 11 Jalan Tan Tock Seng, Singapore, 308433, Singapore.,National Centre for Infectious Diseases, 16 Jalan Tan Tock Seng, Singapore, 308442, Singapore.,Lee Kong Chian School of Medicine, Nanyang Technological University, 59 Nanyang Drive, Singapore, 636921, Singapore
| | - José R Mediavilla
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, NJ, 07110, USA
| | - Barry N Kreiswirth
- Center for Discovery and Innovation, Hackensack Meridian Health, Nutley, NJ, 07110, USA
| | - Yonggui Robin Chi
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Jinghua Ren
- Cancer Center, Union Hospital, Huazhong University of Science & Technology, Wuhan, 430022, Hubei, China
| | - Kam C Tam
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, Ontario, N2L 3G1, Canada
| | - Xue-Wei Liu
- Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Hongwei Duan
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
| | - Yabin Zhu
- Medical School of Ningbo University, Ningbo, 315211, Zhejiang, China
| | - Yuguang Mu
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551, Singapore
| | - Paula T Hammond
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.,Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Guillermo C Bazan
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, 93106-9510, USA
| | - Kevin Pethe
- Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore. .,School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore, 637551, Singapore. .,Lee Kong Chian School of Medicine, Nanyang Technological University, 59 Nanyang Drive, Singapore, 636921, Singapore.
| | - Mary B Chan-Park
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore. .,Centre for Antimicrobial Bioengineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore. .,Lee Kong Chian School of Medicine, Nanyang Technological University, 59 Nanyang Drive, Singapore, 636921, Singapore.
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215
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Viviana Serna González C, Thum M, de Oliveira Ramalho A, Beloto Silva O, Franco Coelho M, Medeiros da Silva Queiroz W, Maria Sebba Tosta de Souza D, Cristina Nogueira P, Lúcia Conceição Gouveia Santos V. Análise da “1a Recomendação Brasileira para o Gerenciamento do Biofilme em Feridas Crônicas e Complexas”. ESTIMA 2019. [DOI: 10.30886/estima.v17.783_pt] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Objetivos: Analisar criticamente a “1ª Recomendação brasileira para o gerenciamento de biofilme em feridas crônicas e complexas”. Método: Realizou-se revisão da literatura atual às informações nele contidas. Resultados: Observou-se que a publicação carece de metodologia compatível com o título, existem lacunas nas recomendações quanto à classificação das evidências e com ausência de fundamentação a partir de importantes consensos internacionais para o tratamento das feridas complexas com suspeita de biofilme, publicados nos últimos três anos. Conclusão: Conclui-se que o manuscrito não deve ser usado como guia de recomendações clínicas, mas como revisão bibliográfica sobre o tema.
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216
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Viviana Serna González C, Thum M, de Oliveira Ramalho A, Beloto Silva O, Franco Coelho M, Medeiros da Silva Queiroz W, Maria Sebba Tosta de Souza D, Cristina Nogueira P, Lúcia Conceição Gouveia Santos V. Analysis of “1st Brazilian Recommendation for Biofilm Management in Chronic and Complex Wounds”. ESTIMA 2019. [DOI: 10.30886/estima.v17.783_in] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Objectives: Analyze critically the “1st Brazilian Recommendation for Biofilm Management in Chronic and Complex Wounds” (from Portuguese, “1a Recomendação Brasileira para o Gerenciamento de Biofilme em Feridas Crônicas e Complexas”). Method: Reviewing information contained in said document according to current literature. Results: The publication was showed to lack methodology compatible with its title; gaps in the recommendations were perceived regarding evidence classification, as well as an absence of grounding from important international consensus, published in the last three years, about treatment of complex wounds with suspected biofilm. Conclusion: The document was concluded to be inadequate for use as a clinical guideline, being considered only a bibliographic review about the theme.
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217
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Sadrearhami Z, Namivandi-Zangeneh R, Price E, Krasowska M, Al-Bataineh SA, Whittle J, Wong EHH, Blencowe A, Boyer C. S-Nitrosothiol Plasma-Modified Surfaces for the Prevention of Bacterial Biofilm Formation. ACS Biomater Sci Eng 2019; 5:5881-5887. [DOI: 10.1021/acsbiomaterials.9b01063] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zahra Sadrearhami
- Centre for Advanced Macromolecular Design (CAMD) and Australian Centre for NanoMedicine (ACN), School of Chemical Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia
| | - Rashin Namivandi-Zangeneh
- Centre for Advanced Macromolecular Design (CAMD) and Australian Centre for NanoMedicine (ACN), School of Chemical Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia
| | - Emily Price
- Future Industries Institute, The University of South Australia, Mawson Lakes, South Australia 5095, Australia
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia 5000, Australia
| | - Marta Krasowska
- Future Industries Institute, The University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - Sameer A. Al-Bataineh
- Future Industries Institute, The University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - Jason Whittle
- Future Industries Institute, The University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - Edgar H. H. Wong
- Centre for Advanced Macromolecular Design (CAMD) and Australian Centre for NanoMedicine (ACN), School of Chemical Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia
| | - Anton Blencowe
- Future Industries Institute, The University of South Australia, Mawson Lakes, South Australia 5095, Australia
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia 5000, Australia
| | - Cyrille Boyer
- Centre for Advanced Macromolecular Design (CAMD) and Australian Centre for NanoMedicine (ACN), School of Chemical Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia
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218
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Guilhen C, Miquel S, Charbonnel N, Joseph L, Carrier G, Forestier C, Balestrino D. Colonization and immune modulation properties of Klebsiella pneumoniae biofilm-dispersed cells. NPJ Biofilms Microbiomes 2019; 5:25. [PMID: 31583108 PMCID: PMC6760147 DOI: 10.1038/s41522-019-0098-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 08/12/2019] [Indexed: 02/07/2023] Open
Abstract
Biofilm-dispersal is a key determinant for further dissemination of biofilm-embedded bacteria. Recent evidence indicates that biofilm-dispersed bacteria have transcriptional features different from those of both biofilm and planktonic bacteria. In this study, the in vitro and in vivo phenotypic properties of Klebsiella pneumoniae cells spontaneously dispersed from biofilm were compared with those of planktonic and sessile cells. Biofilm-dispersed cells, whose growth rate was the same as that of exponential planktonic bacteria but significantly higher than those of sessile and stationary planktonic forms, colonized both abiotic and biotic surfaces more efficiently than their planktonic counterparts regardless of their initial adhesion capabilities. Microscopy studies suggested that dispersed bacteria initiate formation of microcolonies more rapidly than planktonic bacteria. In addition, dispersed cells have both a higher engulfment rate and better survival/multiplication inside macrophages than planktonic cells and sessile cells. In an in vivo murine pneumonia model, the bacterial load in mice lungs infected with biofilm-dispersed bacteria was similar at 6, 24 and 48 h after infection to that of mice lungs infected with planktonic or sessile bacteria. However, biofilm-dispersed and sessile bacteria trend to elicit innate immune response in lungs to a lesser extent than planktonic bacteria. Collectively, the findings from this study suggest that the greater ability of K. pneumoniae biofilm-dispersed cells to efficiently achieve surface colonization and to subvert the host immune response confers them substantial advantages in the first steps of the infection process over planktonic bacteria.
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Affiliation(s)
- Cyril Guilhen
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France.,3Present Address: Université de Genève, Centre Médical Universitaire, Département de Physiologie Cellulaire et Métabolisme, Genève, Suisse
| | - Sylvie Miquel
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France
| | - Nicolas Charbonnel
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France
| | - Laura Joseph
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France
| | - Guillaume Carrier
- 2Université Clermont Auvergne, Inserm U1071, USC-INRA 2018, M2iSH, CRNH Auvergne, Clermont-Ferrand, France.,4Present Address: Department of Surgical Oncology, Institut du Cancer de Montpellier, Montpellier, France
| | | | - Damien Balestrino
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France
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219
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The Pathogenic Factors from Oral Streptococci for Systemic Diseases. Int J Mol Sci 2019; 20:ijms20184571. [PMID: 31540175 PMCID: PMC6770522 DOI: 10.3390/ijms20184571] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/11/2019] [Accepted: 09/14/2019] [Indexed: 02/06/2023] Open
Abstract
The oral cavity is suggested as the reservoir of bacterial infection, and the oral and pharyngeal biofilms formed by oral bacterial flora, which is comprised of over 700 microbial species, have been found to be associated with systemic conditions. Almost all oral microorganisms are non-pathogenic opportunistic commensals to maintain oral health condition and defend against pathogenic microorganisms. However, oral Streptococci, the first microorganisms to colonize oral surfaces and the dominant microorganisms in the human mouth, has recently gained attention as the pathogens of various systemic diseases, such as infective endocarditis, purulent infections, brain hemorrhage, intestinal inflammation, and autoimmune diseases, as well as bacteremia. As pathogenic factors from oral Streptococci, extracellular polymeric substances, toxins, proteins and nucleic acids as well as vesicles, which secrete these components outside of bacterial cells in biofilm, have been reported. Therefore, it is necessary to consider that the relevance of these pathogenic factors to systemic diseases and also vaccine candidates to protect infectious diseases caused by Streptococci. This review article focuses on the mechanistic links among pathogenic factors from oral Streptococci, inflammation, and systemic diseases to provide the current understanding of oral biofilm infections based on biofilm and widespread systemic diseases.
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220
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Sharahi JY, Azimi T, Shariati A, Safari H, Tehrani MK, Hashemi A. Advanced strategies for combating bacterial biofilms. J Cell Physiol 2019; 234:14689-14708. [PMID: 30693517 DOI: 10.1002/jcp.28225] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 01/16/2019] [Indexed: 01/24/2023]
Abstract
Biofilms are communities of microorganisms that are formed on and attached to living or nonliving surfaces and are surrounded by an extracellular polymeric material. Biofilm formation enjoys several advantages over the pathogens in the colonization process of medical devices and patients' organs. Unlike planktonic cells, biofilms have high intrinsic resistance to antibiotics and sanitizers, and overcoming them is a significant problematic challenge in the medical and food industries. There are no approved treatments to specifically target biofilms. Thus, it is required to study and present innovative and effective methods to combat a bacterial biofilm. In this review, several strategies have been discussed for combating bacterial biofilms to improve healthcare, food safety, and industrial process.
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Affiliation(s)
- Javad Yasbolaghi Sharahi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Taher Azimi
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Aref Shariati
- Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Hossein Safari
- Health Promotion Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Melika Khanzadeh Tehrani
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Ali Hashemi
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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221
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Ali IAA, Cheung BPK, Yau JYY, Matinlinna JP, Lévesque CM, Belibasakis GN, Neelakantan P. The influence of substrate surface conditioning and biofilm age on the composition of
Enterococcus faecalis
biofilms. Int Endod J 2019; 53:53-61. [DOI: 10.1111/iej.13202] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 08/09/2019] [Indexed: 02/06/2023]
Affiliation(s)
- I. A. A. Ali
- Faculty of Dentistry The University of Hong Kong Hong Kong SAR
| | - B. P. K. Cheung
- Faculty of Dentistry The University of Hong Kong Hong Kong SAR
| | - J. Y. Y. Yau
- Faculty of Dentistry The University of Hong Kong Hong Kong SAR
| | | | - C. M. Lévesque
- Faculty of Dentistry University of Toronto Toronto ON Canada
| | - G. N. Belibasakis
- Division of Oral Diseases Department of Dental Medicine Karolinska Institute Huddinge Sweden
| | - P. Neelakantan
- Faculty of Dentistry The University of Hong Kong Hong Kong SAR
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222
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Arciola CR, Campoccia D, Montanaro L. Implant infections: adhesion, biofilm formation and immune evasion. Nat Rev Microbiol 2019; 16:397-409. [PMID: 29720707 DOI: 10.1038/s41579-018-0019-y] [Citation(s) in RCA: 1049] [Impact Index Per Article: 209.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Medical device-associated infections account for a large proportion of hospital-acquired infections. A variety of opportunistic pathogens can cause implant infections, depending on the type of the implant and on the anatomical site of implantation. The success of these versatile pathogens depends on rapid adhesion to virtually all biomaterial surfaces and survival in the hostile host environment. Biofilm formation on implant surfaces shelters the bacteria and encourages persistence of infection. Furthermore, implant-infecting bacteria can elude innate and adaptive host defences as well as biocides and antibiotic chemotherapies. In this Review, we explore the fundamental pathogenic mechanisms underlying implant infections, highlighting orthopaedic implants and Staphylococcus aureus as a prime example, and discuss innovative targets for preventive and therapeutic strategies.
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Affiliation(s)
- Carla Renata Arciola
- Research Unit on Implant Infections, Rizzoli Orthopaedic Institute, Bologna, Italy. .,Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy.
| | - Davide Campoccia
- Research Unit on Implant Infections, Rizzoli Orthopaedic Institute, Bologna, Italy
| | - Lucio Montanaro
- Research Unit on Implant Infections, Rizzoli Orthopaedic Institute, Bologna, Italy.,Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
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223
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Wu J, Li F, Hu X, Lu J, Sun X, Gao J, Ling D. Responsive Assembly of Silver Nanoclusters with a Biofilm Locally Amplified Bactericidal Effect to Enhance Treatments against Multi-Drug-Resistant Bacterial Infections. ACS CENTRAL SCIENCE 2019; 5:1366-1376. [PMID: 31482119 PMCID: PMC6716126 DOI: 10.1021/acscentsci.9b00359] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Indexed: 05/19/2023]
Abstract
Bacterial biofilms pose a major threat to public health because they are resistant to most current therapeutics. Conventional antibiotics exhibit limited penetration and weakened activity in the acidic microenvironment of a biofilm. Here, the development of biofilm-responsive nanoantibiotics (rAgNAs) composed of self-assembled silver nanoclusters and pH-sensitive charge reversal ligands, whose bactericidal activity can be selectively boosted in the biofilm microenvironment, is reported. Under neutral physiological conditions, the bactericidal activity of rAgNAs is self-quenched because the toxic silver ions' release is largely inhibited; however, upon entry into the acidic biofilm microenvironment, the rAgNAs not only exhibit charge reversal to facilitate local accumulation and retention but also disassemble into small silver nanoclusters, thus enabling deep penetration and accelerated silver ions release for dramatically amplified bactericidal activity. The superior antibiofilm activity of rAgNAs is demonstrated both in vitro and in vivo, and the mortality rate of mice with multi-drug-resistant biofilm-induced severe pyomyositis can be significantly reduced by rAgNAs treatment, indicating the immense potential of rAgNAs as highly efficient nanoscale antibacterial agents to combat resistant bacterial biofilm-associated infections.
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Affiliation(s)
- Jiahe Wu
- Institute
of Pharmaceutics, College of Pharmaceutical Sciences, Key Laboratory of Biomedical
Engineering of the Ministry of Education, College of Biomedical Engineering
& Instrument Science, and Hangzhou Institute of Innovative Medicine, Zhejiang University, Hangzhou 310058, P. R.
China
| | - Fangyuan Li
- Institute
of Pharmaceutics, College of Pharmaceutical Sciences, Key Laboratory of Biomedical
Engineering of the Ministry of Education, College of Biomedical Engineering
& Instrument Science, and Hangzhou Institute of Innovative Medicine, Zhejiang University, Hangzhou 310058, P. R.
China
| | - Xi Hu
- Institute
of Pharmaceutics, College of Pharmaceutical Sciences, Key Laboratory of Biomedical
Engineering of the Ministry of Education, College of Biomedical Engineering
& Instrument Science, and Hangzhou Institute of Innovative Medicine, Zhejiang University, Hangzhou 310058, P. R.
China
| | - Jingxiong Lu
- Institute
of Pharmaceutics, College of Pharmaceutical Sciences, Key Laboratory of Biomedical
Engineering of the Ministry of Education, College of Biomedical Engineering
& Instrument Science, and Hangzhou Institute of Innovative Medicine, Zhejiang University, Hangzhou 310058, P. R.
China
| | - Xiaolian Sun
- Department
of Pharmaceutical Analysis, China Pharmaceutical
University, Nanjing 210009, P. R. China
| | - Jianqing Gao
- Institute
of Pharmaceutics, College of Pharmaceutical Sciences, Key Laboratory of Biomedical
Engineering of the Ministry of Education, College of Biomedical Engineering
& Instrument Science, and Hangzhou Institute of Innovative Medicine, Zhejiang University, Hangzhou 310058, P. R.
China
- E-mail:
| | - Daishun Ling
- Institute
of Pharmaceutics, College of Pharmaceutical Sciences, Key Laboratory of Biomedical
Engineering of the Ministry of Education, College of Biomedical Engineering
& Instrument Science, and Hangzhou Institute of Innovative Medicine, Zhejiang University, Hangzhou 310058, P. R.
China
- E-mail:
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224
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Abstract
Biofilms are structured and organized communities of microorganisms that represent one of the most successful forms of life on Earth. Bacterial biofilms have been studied in great detail, and many molecular details are known about the processes that govern bacterial biofilm formation, however, archaea are ubiquitous in almost all habitats on Earth and can also form biofilms. In recent years, insights have been gained into the development of archaeal biofilms, how archaea communicate to form biofilms and how the switch from a free-living lifestyle to a sessile lifestyle is regulated. In this Review, we explore the different stages of archaeal biofilm development and highlight similarities and differences between archaea and bacteria on a molecular level. We also consider the role of archaeal biofilms in industry and their use in different industrial processes.
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Affiliation(s)
- Marleen van Wolferen
- Molecular Biology of Archaea, Institute of Biology II, Microbiology, University of Freiburg, Freiburg, Germany
| | - Alvaro Orell
- Max Planck Institute for Terrestrial Microbiology, Marburg, Germany
| | - Sonja-Verena Albers
- Molecular Biology of Archaea, Institute of Biology II, Microbiology, University of Freiburg, Freiburg, Germany.
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225
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Pseudomonas aeruginosa Requires the DNA-Specific Endonuclease EndA To Degrade Extracellular Genomic DNA To Disperse from the Biofilm. J Bacteriol 2019; 201:JB.00059-19. [PMID: 30988033 DOI: 10.1128/jb.00059-19] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 04/08/2019] [Indexed: 01/16/2023] Open
Abstract
The dispersion of biofilms is an active process resulting in the release of planktonic cells from the biofilm structure. While much is known about the process of dispersion cue perception and the subsequent modulation of the c-di-GMP pool, little is known about subsequent events resulting in the release of cells from the biofilm. Given that dispersion coincides with void formation and an overall erosion of the biofilm structure, we asked whether dispersion involves degradation of the biofilm matrix. Here, we focused on extracellular genomic DNA (eDNA) due to its almost universal presence in the matrix of biofilm-forming species. We identified two probable nucleases, endA and eddB, and eddA encoding a phosphatase that were significantly increased in transcript abundance in dispersed cells. However, only inactivation of endA but not eddA or eddB impaired dispersion by Pseudomonas aeruginosa biofilms in response to glutamate and nitric oxide (NO). Heterologously produced EndA was found to be secreted and active in degrading genomic DNA. While endA inactivation had little effect on biofilm formation and the presence of eDNA in biofilms, eDNA degradation upon induction of dispersion was impaired. In contrast, induction of endA expression coincided with eDNA degradation and resulted in biofilm dispersion. Thus, released cells demonstrated a hyperattaching phenotype but remained as resistant to tobramycin as biofilm cells from which they egress, indicating EndA-dispersed cells adopted some but not all of the phenotypes associated with dispersed cells. Our findings indicate for the first time a role of DNase EndA in dispersion and suggest weakening of the biofilm matrix is a requisite for biofilm dispersion.IMPORTANCE The finding that exposure to DNase I impairs biofilm formation or leads to the dispersal of early stage biofilms has led to the realization of extracellular genomic DNA (eDNA) as a structural component of the biofilm matrix. However, little is known about the contribution of intrinsic DNases to the weakening of the biofilm matrix and dispersion of established biofilms. Here, we demonstrate for the first time that nucleases are induced in dispersed Pseudomonas aeruginosa cells and are essential to the dispersion response and that degradation of matrix eDNA by endogenously produced/secreted EndA is required for P. aeruginosa biofilm dispersion. Our findings suggest that dispersing cells mediate their active release from the biofilm matrix via the induction of nucleases.
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226
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van Gestel J, Ackermann M, Wagner A. Microbial life cycles link global modularity in regulation to mosaic evolution. Nat Ecol Evol 2019; 3:1184-1196. [PMID: 31332330 DOI: 10.1038/s41559-019-0939-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 06/03/2019] [Indexed: 11/09/2022]
Abstract
Microbes are exposed to changing environments, to which they can respond by adopting various lifestyles such as swimming, colony formation or dormancy. These lifestyles are often studied in isolation, thereby giving a fragmented view of the life cycle as a whole. Here, we study lifestyles in the context of this whole. We first use machine learning to reconstruct the expression changes underlying life cycle progression in the bacterium Bacillus subtilis, based on hundreds of previously acquired expression profiles. This yields a timeline that reveals the modular organization of the life cycle. By analysing over 380 Bacillales genomes, we then show that life cycle modularity gives rise to mosaic evolution in which life stages such as motility and sporulation are conserved and lost as discrete units. We postulate that this mosaic conservation pattern results from habitat changes that make these life stages obsolete or detrimental. Indeed, when evolving eight distinct Bacillales strains and species under laboratory conditions that favour colony growth, we observe rapid and parallel losses of the sporulation life stage across species, induced by mutations that affect the same global regulator. We conclude that a life cycle perspective is pivotal to understanding the causes and consequences of modularity in both regulation and evolution.
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Affiliation(s)
- Jordi van Gestel
- Department of Evolutionary Biology and Environmental Studies, University of Zürich, Zürich, Switzerland. .,Swiss Institute of Bioinformatics, Lausanne, Switzerland. .,Department of Environmental Systems Science, ETH Zürich, Zürich, Switzerland. .,Department of Environmental Microbiology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf, Switzerland.
| | - Martin Ackermann
- Department of Environmental Systems Science, ETH Zürich, Zürich, Switzerland.,Department of Environmental Microbiology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf, Switzerland
| | - Andreas Wagner
- Department of Evolutionary Biology and Environmental Studies, University of Zürich, Zürich, Switzerland. .,Swiss Institute of Bioinformatics, Lausanne, Switzerland. .,The Santa Fe Institute, Santa Fe, NM, USA.
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227
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Deliorman M, Duatepe FPG, Davenport EK, Fransson BA, Call DR, Beyenal H, Abu-Lail NI. Responses of Acinetobacter baumannii Bound and Loose Extracellular Polymeric Substances to Hyperosmotic Agents Combined with or without Tobramycin: An Atomic Force Microscopy Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9071-9083. [PMID: 31184900 PMCID: PMC7607972 DOI: 10.1021/acs.langmuir.9b01227] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In this work, contributions of extracellular polymeric substances (EPS) to the nanoscale mechanisms through which the multidrug-resistant Acinetobacter baumannii responds to antimicrobial and hyperosmotic treatments were investigated by atomic force microscopy. Specifically, the adhesion strengths to a control surface of silicon nitride (Si3N4) and the lengths of bacterial surface biopolymers of bound and loose EPS extracted from A. baumannii biofilms were quantified after individual or synergistic treatments with hyperosmotic agents (NaCl and maltodextrin) and an antibiotic (tobramycin). In the absence of any treatment, the loose EPS were significantly longer in length and higher in adhesion to Si3N4 than the bound EPS. When used individually, the hyperosmotic agents and tobramycin collapsed the A. baumannii bound and loose EPS. The combined treatment of maltodextrin with tobramycin collapsed only the loose EPS and did not alter the adhesion of both bound and loose EPS to Si3N4. In addition, the combined treatment was not as effective in collapsing the EPS molecules as when tobramycin was applied alone. Finally, the effects of treatments were dose-dependent. Altogether, our findings suggest that a sequential treatment could be effective in treating A. baumannii biofilms, in which a hyperosmotic agent is used first to collapse the EPS and limit the diffusion of nutrients into the biofilm, followed by the use of an antibiotic to kill the bacterial cells that escape from the biofilm because of starvation.
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Affiliation(s)
- Muhammedin Deliorman
- Division of Engineering, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, UAE
| | | | - Emily K. Davenport
- Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, 99164 Pullman, Washington, United States
| | - Boel A. Fransson
- Department of Veterinary Clinical Sciences, Washington State University, 99164 Pullman, Washington, United States
| | - Douglas R. Call
- Paul G. Allen School for Global Animal Health, Washington State University, 99164 Pullman, Washington, United States
| | - Haluk Beyenal
- Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, 99164 Pullman, Washington, United States
| | - Nehal I. Abu-Lail
- Department of Biomedical Engineering, University of Texas at San Antonio, 78249 San Antonio, Texas, United States
- Corresponding Author:. Phone: +1 210 458 8131
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228
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Staps M, van Gestel J, Tarnita CE. Emergence of diverse life cycles and life histories at the origin of multicellularity. Nat Ecol Evol 2019; 3:1197-1205. [PMID: 31285576 DOI: 10.1038/s41559-019-0940-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 06/04/2019] [Indexed: 02/07/2023]
Abstract
The evolution of multicellularity has given rise to a remarkable diversity of multicellular life cycles and life histories. Whereas some multicellular organisms are long-lived, grow through cell division, and repeatedly release single-celled propagules (for example, animals), others are short-lived, form by aggregation, and propagate only once, by generating large numbers of solitary cells (for example, cellular slime moulds). There are no systematic studies that explore how diverse multicellular life cycles can come about. Here, we focus on the origin of multicellularity and develop a mechanistic model to examine the primitive life cycles that emerge from a unicellular ancestor when an ancestral gene is co-opted for cell adhesion. Diverse life cycles readily emerge, depending on ecological conditions, group-forming mechanism, and ancestral constraints. Among these life cycles, we recapitulate both extremes of long-lived groups that propagate continuously and short-lived groups that propagate only once, with the latter type of life cycle being particularly favoured when groups can form by aggregation. Our results show how diverse life cycles and life histories can easily emerge at the origin of multicellularity, shaped by ancestral constraints and ecological conditions. Beyond multicellularity, this finding has similar implications for other major transitions, such as the evolution of sociality.
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Affiliation(s)
- Merlijn Staps
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA
| | - Jordi van Gestel
- Department of Evolutionary Biology and Environmental Studies, University of Zürich, Zürich, Switzerland. .,Swiss Institute of Bioinformatics, Lausanne, Switzerland. .,Department of Environmental Systems Science, ETH Zürich, Zürich, Switzerland. .,Department of Environmental Microbiology, Swiss Federal Institute of Aquatic Science and Technology (EAWAG), Dübendorf, Switzerland.
| | - Corina E Tarnita
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA.
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229
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Jacek P, Dourado F, Gama M, Bielecki S. Molecular aspects of bacterial nanocellulose biosynthesis. Microb Biotechnol 2019; 12:633-649. [PMID: 30883026 PMCID: PMC6559022 DOI: 10.1111/1751-7915.13386] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 02/03/2019] [Accepted: 02/08/2019] [Indexed: 11/27/2022] Open
Abstract
Bacterial nanocellulose (BNC) produced by aerobic bacteria is a biopolymer with sophisticated technical properties. Although the potential for economically relevant applications is huge, the cost of BNC still limits its application to a few biomedical devices and the edible product Nata de Coco, made available by traditional fermentation methods in Asian countries. Thus, a wider economic relevance of BNC is still dependent on breakthrough developments on the production technology. On the other hand, the development of modified strains able to overproduce BNC with new properties - e.g. porosity, density of fibres crosslinking, mechanical properties, etc. - will certainly allow to overcome investment and cost production issues and enlarge the scope of BNC applications. This review discusses current knowledge about the molecular basis of BNC biosynthesis, its regulations and, finally, presents a perspective on the genetic modification of BNC producers made possible by the new tools available for genetic engineering.
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Affiliation(s)
- Paulina Jacek
- Institute of Technical BiochemistryLodz University of Technology4/10 Stefanowskiego Str90‐924LodzPoland
| | - Fernando Dourado
- Centre of Biological EngineeringUniversity of MinhoCampus de Gualtar4710‐057BragaPortugal
| | - Miguel Gama
- Centre of Biological EngineeringUniversity of MinhoCampus de Gualtar4710‐057BragaPortugal
| | - Stanisław Bielecki
- Institute of Technical BiochemistryLodz University of Technology4/10 Stefanowskiego Str90‐924LodzPoland
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230
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Anti-Biofilm Activity of Lactic Acid Bacteria Isolated from Kefir Against Multidrug-Resistant Klebsiella pneumoniae. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2019. [DOI: 10.22207/jpam.13.2.35] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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231
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Gannesen AV, Zdorovenko EL, Botchkova EA, Hardouin J, Massier S, Kopitsyn DS, Gorbachevskii MV, Kadykova AA, Shashkov AS, Zhurina MV, Netrusov AI, Knirel YA, Plakunov VK, Feuilloley MGJ. Composition of the Biofilm Matrix of Cutibacterium acnes Acneic Strain RT5. Front Microbiol 2019; 10:1284. [PMID: 31293526 PMCID: PMC6598116 DOI: 10.3389/fmicb.2019.01284] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 05/23/2019] [Indexed: 12/11/2022] Open
Abstract
In skin, Cutibacterium acnes (former Propionibacterium acnes) can behave as an opportunistic pathogen, depending on the strain and environmental conditions. Acneic strains of C. acnes form biofilms inside skin-gland hollows, inducing inflammation and skin disorders. The essential exogenous products of C. acnes accumulate in the extracellular matrix of the biofilm, conferring essential bacterial functions to this structure. However, little is known about the actual composition of the biofilm matrix of C. acnes. Here, we developed a new technique for the extraction of the biofilm matrix of Gram-positive bacteria without the use of chemical or enzymatic digestion, known to be a source of artifacts. Our method is based on the physical separation of the cells and matrix of sonicated biofilms by ultracentrifugation through a CsCl gradient. Biofilms were grown on the surface of cellulose acetate filters, and the biomass was collected without contamination by the growth medium. The biofilm matrix of the acneic C. acnes RT5 strain appears to consist mainly of polysaccharides. The following is the ratio of the main matrix components: 62.6% polysaccharides, 9.6% proteins, 4.0% DNA, and 23.8% other compounds (porphyrins precursors and other). The chemical structure of the major polysaccharide was determined using a nuclear magnetic resonance technique, the formula being →6)-α-D-Galp-(1→4)-β-D-ManpNAc3NAcA-(1→6)-α-D-Glcp-(1→4)-β-D-ManpNAc3NAcA-(1→3)-β-GalpNAc-(1→. We detected 447 proteins in the matrix, of which the most abundant were the chaperonin GroL, the elongation factors EF-Tu and EF-G, several enzymes of glycolysis, and proteins of unknown function. The matrix also contained more than 20 hydrolases of various substrata, pathogenicity factors, and many intracellular proteins and enzymes. We also performed surface-enhanced Raman spectroscopy analysis of the C. acnes RT5 matrix for the first time, providing the surface-enhanced Raman scattering (SERS) profiles of the C. acnes RT5 biofilm matrix and biofilm biomass. The difference between the matrix and biofilm biomass spectra showed successful matrix extraction rather than simply the presence of cell debris after sonication. These data show the complexity of the biofilm matrix composition and should be essential for the development of new anti-C. acnes biofilms and potential antibiofilm drugs.
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Affiliation(s)
- Andrei V. Gannesen
- Winogradsky Institute of Microbiology, Federal Research Centre «Fundamentals of Biotechnology», Russian Academy of Sciences, Moscow, Russia
| | - Evelina L. Zdorovenko
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Ekaterina A. Botchkova
- Winogradsky Institute of Microbiology, Federal Research Centre «Fundamentals of Biotechnology», Russian Academy of Sciences, Moscow, Russia
- Department of Physical and Colloid Chemistry, Gubkin University, Moscow, Russia
| | - Julie Hardouin
- Laboratory of Polymers, Biopolymers, Surfaces UMR 6270 PBS, Rouen University, Rouen, France
| | - Sebastien Massier
- Laboratory of Polymers, Biopolymers, Surfaces UMR 6270 PBS, Rouen University, Rouen, France
| | - Dmitry S. Kopitsyn
- Department of Physical and Colloid Chemistry, Gubkin University, Moscow, Russia
| | | | - Alexandra A. Kadykova
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Higher Chemical College of the Russian Academy of Sciences, Mendeleyev University of Chemical Technology of Russia, Moscow, Russia
| | - Alexander S. Shashkov
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Marina V. Zhurina
- Winogradsky Institute of Microbiology, Federal Research Centre «Fundamentals of Biotechnology», Russian Academy of Sciences, Moscow, Russia
| | | | - Yuriy A. Knirel
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Vladimir K. Plakunov
- Winogradsky Institute of Microbiology, Federal Research Centre «Fundamentals of Biotechnology», Russian Academy of Sciences, Moscow, Russia
| | - Marc G. J. Feuilloley
- EA4312 Laboratory of Microbiology Signals and Microenvironment, Rouen University, Evreux, France
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232
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Castillo JA, Agathos SN. A genome-wide scan for genes under balancing selection in the plant pathogen Ralstonia solanacearum. BMC Evol Biol 2019; 19:123. [PMID: 31208326 PMCID: PMC6580516 DOI: 10.1186/s12862-019-1456-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 06/10/2019] [Indexed: 02/07/2023] Open
Abstract
Background Plant pathogens are under significant selective pressure by the plant host. Consequently, they are expected to have adapted to this condition or contribute to evading plant defenses. In order to acquire long-term fitness, plant bacterial pathogens are usually forced to maintain advantageous genetic diversity in populations. This strategy ensures that different alleles in the pathogen’s gene pool are maintained in a population at frequencies larger than expected under neutral evolution. This selective process, known as balancing selection, is the subject of this work in the context of a common bacterial phytopathogen. We performed a genome-wide scan of Ralstonia solanacearum species complex, an aggressive plant bacterial pathogen that shows broad host range and causes a devastating disease called ‘bacterial wilt’. Results Using a sliding window approach, we analyzed 57 genomes from three phylotypes of the R. solanacearum species complex to detect signatures of balancing selection. A total of 161 windows showed extreme values in three summary statistics of population genetics: Tajima’s D, θw and Fu & Li’s D*. We discarded any confounding effects due to demographic events by means of coalescent simulations of genetic data. The prospective windows correspond to 78 genes with known function that map in any of the two main replicons (1.7% of total number of genes). The candidate genes under balancing selection are related to primary metabolism and other basal activities (51.3%) or directly associated to virulence (48.7%), the latter being involved in key functions targeted to dismantle plant defenses or to participate in critical stages in the pathogenic process. Conclusions We identified various genes under balancing selection that play a significant role in basic metabolism as well as in virulence of the R. solanacearum species complex. These genes are useful to understand and monitor the evolution of bacterial pathogen populations and emerge as potential candidates for future treatments to induce specific plant immune responses. Electronic supplementary material The online version of this article (10.1186/s12862-019-1456-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- José A Castillo
- School of Biological Sciences and Engineering, Yachay Tech University, Hacienda San Jose s/n and Proyecto Yachay, Urcuquí, Ecuador.
| | - Spiros N Agathos
- School of Biological Sciences and Engineering, Yachay Tech University, Hacienda San Jose s/n and Proyecto Yachay, Urcuquí, Ecuador
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233
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Zhou R, Zhou R, Wang P, Luan B, Zhang X, Fang Z, Xian Y, Lu X, Ostrikov KK, Bazaka K. Microplasma Bubbles: Reactive Vehicles for Biofilm Dispersal. ACS APPLIED MATERIALS & INTERFACES 2019; 11:20660-20669. [PMID: 31067024 DOI: 10.1021/acsami.9b03961] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Interactions between effects generated by cold atmospheric-pressure plasmas and water have been widely investigated for water purification, chemical and nanomaterial synthesis, and, more recently, medicine and biotechnology. Reactive oxygen and nitrogen species (RONS) play critical roles in transferring the reactivity from gas plasmas to solutions to induce specific biochemical responses in living targets, e.g., pathogen inactivation and biofilm removal. While this approach works well in a single-organism system at a laboratory scale, integration of plasma-enabled biofilm removal into complex real-life systems, e.g., large aquaculture tanks, is far from trivial. This is because it is difficult to deliver sufficient concentrations of the right kind of species to biofilm-covered surfaces while carefully maintaining a suitable physiochemical environment that is healthy for its inhabitants, e.g., fish. In this work, we show that underwater microplasma bubbles (generated by a microplasma-bubble reactor that forms a dielectric barrier discharge at the gas-liquid interface with the applied voltage of 4.0 kV) act as transport vehicles to efficiently deliver reactive plasma species to the target biofilm sites on artificial and living surfaces while keeping healthy water conditions in a multispecies system. The as-generated air microplasma bubbles and plasma-activated water (PAW) both can effectively reduce the existing pathogenic biofilm load by ∼83 and 60%, respectively, after 15 min of discharge at 40 W and prevent any new biofilm from forming. The generation of underwater microplasma bubbles in a custom-made fish tank for less than a minute per day (20 s per time, twice daily) can introduce sufficient quantities of RONS into PAW to reduce the biofilm-infected area by ∼80-90% and improve the health status of Cichlasoma synspilum × Cichlasoma citrinellum blood parrot cichlid fish. Species generated include hydrogen peroxide, ozone, nitrite, nitrate, and nitric oxide. Using mimicked chemical solutions, we show that the plasma-induced nitric oxide acts as a critical bioactive species that triggers the release of cells from the biofilm and their inactivation.
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Affiliation(s)
| | | | | | - Bingyu Luan
- Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Institute of Electromagnetics and Acoustics, Department of Electronic Science, College of Electronic Science and Technology , Xiamen University , Xiamen 361005 , China
| | - Xianhui Zhang
- Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Institute of Electromagnetics and Acoustics, Department of Electronic Science, College of Electronic Science and Technology , Xiamen University , Xiamen 361005 , China
| | - Zhi Fang
- College of Electrical Engineering and Control Science , Nanjing Tech University , Nanjing 210009 , China
| | - Yubin Xian
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Xinpei Lu
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering , Huazhong University of Science and Technology , Wuhan 430074 , China
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Maczynska B, Secewicz A, Smutnicka D, Szymczyk P, Dudek-Wicher R, Junka A, Bartoszewicz M. In vitro efficacy of gentamicin released from collagen sponge in eradication of bacterial biofilm preformed on hydroxyapatite surface. PLoS One 2019; 14:e0217769. [PMID: 31163049 PMCID: PMC6548372 DOI: 10.1371/journal.pone.0217769] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 05/17/2019] [Indexed: 01/04/2023] Open
Abstract
Biofilm-related infections of bones pose a significant therapeutic issue. In this article we present in vitro results of the efficacy of gentamicin released from a collagen sponge carrier against Staphylococcus aureus, Pseudomonas aeruginosa and Klebsiella pneumoniae biofilms preformed on hydroxyapatite surface. The results indicate that high local concentrations of gentamicin released from a sponge eradicate the biofilm formed not only by gentamicin-sensitive strains but, to some extent, also by those that display a resistance pattern in routine diagnostics. The data presented in this paper is of high clinical translational value and may find application in the treatment of bone infections.
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Affiliation(s)
- Beata Maczynska
- Department of Pharmaceutical Microbiology and Parasitology, Wroclaw Medical University, Wrocław, Poland
| | - Anna Secewicz
- Department of Pharmaceutical Microbiology and Parasitology, Wroclaw Medical University, Wrocław, Poland
| | - Danuta Smutnicka
- Department of Pharmaceutical Microbiology and Parasitology, Wroclaw Medical University, Wrocław, Poland
| | - Patrycja Szymczyk
- Centre for Advanced Manufacturing Technologies (CAMT/FPC), Faculty of Mechanical Engineering, Wrocław University of Science and Technology, Wrocław, Poland
| | - Ruth Dudek-Wicher
- Department of Pharmaceutical Microbiology and Parasitology, Wroclaw Medical University, Wrocław, Poland
| | - Adam Junka
- Department of Pharmaceutical Microbiology and Parasitology, Wroclaw Medical University, Wrocław, Poland
| | - Marzenna Bartoszewicz
- Department of Pharmaceutical Microbiology and Parasitology, Wroclaw Medical University, Wrocław, Poland
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235
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Antunes J, Leão P, Vasconcelos V. Marine biofilms: diversity of communities and of chemical cues. ENVIRONMENTAL MICROBIOLOGY REPORTS 2019; 11:287-305. [PMID: 30246474 DOI: 10.1111/1758-2229.12694] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 09/14/2018] [Indexed: 06/08/2023]
Abstract
Surfaces immersed in seawater are rapidly colonized by various microorganisms, resulting in the formation of heterogenic marine biofilms. These communities are known to influence the settlement of algae spores and invertebrate larvae, triggering a succession of fouling events, with significant environmental and economic impacts. This review covers recent research regarding the differences in composition of biofilms isolated from different artificial surface types and the influence of environmental factors on their formation. One particular phenomenon - bacterial quorum sensing (QS) - allows bacteria to coordinate swarming, biofilm formation among other phenomena. Some other marine biofilm chemical cues are believed to modulate the settlement and the succession of macrofouling organisms, and they are also reviewed here. Finally, since the formation of a marine biofilm is considered to be an initial, QS-dependent step in the development of marine fouling events, QS inhibition is discussed on its potential as a tool for antibiofouling control in marine settings.
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Affiliation(s)
- Jorge Antunes
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Av. General Norton de Matos, s/n 4450-208, Matosinhos, Portugal
- Department of Biology, Faculty of Sciences, University of Porto, Rua do Campo Alegre 4069-007, Porto, Portugal
| | - Pedro Leão
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Av. General Norton de Matos, s/n 4450-208, Matosinhos, Portugal
- Department of Biology, Faculty of Sciences, University of Porto, Rua do Campo Alegre 4069-007, Porto, Portugal
| | - Vitor Vasconcelos
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Av. General Norton de Matos, s/n 4450-208, Matosinhos, Portugal
- Department of Biology, Faculty of Sciences, University of Porto, Rua do Campo Alegre 4069-007, Porto, Portugal
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236
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When We Stop Thinking about Microbes as Cells. J Mol Biol 2019; 431:2487-2492. [DOI: 10.1016/j.jmb.2019.05.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Revised: 04/19/2019] [Accepted: 05/04/2019] [Indexed: 12/21/2022]
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237
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Di Pippo F, Di Gregorio L, Congestri R, Tandoi V, Rossetti S. Biofilm growth and control in cooling water industrial systems. FEMS Microbiol Ecol 2019; 94:4935158. [PMID: 29596620 DOI: 10.1093/femsec/fiy044] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 03/13/2018] [Indexed: 12/18/2022] Open
Abstract
Matrix-embedded, surface-attached microbial communities, known as biofilms, profusely colonise industrial cooling water systems, where the availability of nutrients and organic matter favours rapid microbial proliferation and their adhesion to surfaces in the evaporative fill material, heat exchangers, water reservoir and cooling water sections and pipelines. The extensive growth of biofilms can promote micro-biofouling and microbially induced corrosion (MIC) as well as pose health problems associated with the presence of pathogens like Legionella pneumophila. This review examines critically biofilm occurrence in cooling water systems and the main factors potentially affecting biofilm growth, biodiversity and structure. A broad evaluation of the most relevant biofilm monitoring and control strategies currently used or potentially useful in cooling water systems is also provided.
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Affiliation(s)
- F Di Pippo
- CNR-IRSA, National Research Council, Water Research Institute, Via Salaria Km 29.300, Monterotondo 00015, Rome, Italy.,CNR-IAMC, National Research Council, Institute for Coastal Marine Environment, Località Sa Mardini, Torregrande, 09170 Oristano, Italy
| | - L Di Gregorio
- CNR-IRSA, National Research Council, Water Research Institute, Via Salaria Km 29.300, Monterotondo 00015, Rome, Italy.,University of Rome Tor Vergata, Department of Biology, Via Cracovia 1, 00133 Rome, Italy
| | - R Congestri
- University of Rome Tor Vergata, Department of Biology, Via Cracovia 1, 00133 Rome, Italy
| | - V Tandoi
- CNR-IRSA, National Research Council, Water Research Institute, Via Salaria Km 29.300, Monterotondo 00015, Rome, Italy
| | - S Rossetti
- CNR-IRSA, National Research Council, Water Research Institute, Via Salaria Km 29.300, Monterotondo 00015, Rome, Italy
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238
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Li G, Wang H, Ma D, Xue W, Zhang W. WITHDRAWN: A star copolymer consisting of a β-cyclodextrin core and poly(amidoamine) dendron arms for co-delivering nitric oxide and triclosan for combined antibacterial effect. Acta Biomater 2019:S1742-7061(19)30227-2. [PMID: 30926578 DOI: 10.1016/j.actbio.2019.03.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 03/02/2019] [Accepted: 03/25/2019] [Indexed: 11/20/2022]
Abstract
This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal.
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Affiliation(s)
- Guowei Li
- Key Laboratory of Biomaterials of Guangdong Higher Education Institutes, Department of Biomedical Engineering, Jinan University, Guangzhou 510632, China
| | - Haiyang Wang
- Key Laboratory of Biomaterials of Guangdong Higher Education Institutes, Department of Biomedical Engineering, Jinan University, Guangzhou 510632, China
| | - Dong Ma
- Key Laboratory of Biomaterials of Guangdong Higher Education Institutes, Department of Biomedical Engineering, Jinan University, Guangzhou 510632, China.
| | - Wei Xue
- Key Laboratory of Biomaterials of Guangdong Higher Education Institutes, Department of Biomedical Engineering, Jinan University, Guangzhou 510632, China
| | - Wu Zhang
- The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou 510632, China; School of Stomatology of Jinan University, Jinan University, Guangzhou 510632, China.
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239
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Navarrete B, Leal-Morales A, Serrano-Ron L, Sarrió M, Jiménez-Fernández A, Jiménez-Díaz L, López-Sánchez A, Govantes F. Transcriptional organization, regulation and functional analysis of flhF and fleN in Pseudomonas putida. PLoS One 2019; 14:e0214166. [PMID: 30889223 PMCID: PMC6424431 DOI: 10.1371/journal.pone.0214166] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 03/07/2019] [Indexed: 11/25/2022] Open
Abstract
The Pseudomonas putida flhA-flhF-fleN-fliA cluster encodes a component of the flagellar export gate and three regulatory elements potentially involved in flagellar biogenesis and other functions. Here we show that these four genes form an operon, whose transcription is driven from the upstream PflhA promoter. A second promoter, PflhF, provides additional transcription of the three distal genes. PflhA and PflhF are σN-dependent, activated by the flagellar regulator FleQ, and negatively regulated by FleN. Motility, surface adhesion and colonization defects of a transposon insertion mutant in flhF revealed transcriptional polarity on fleN and fliA, as the former was required for strong surface adhesion and biofilm formation, and the latter was required for flagellar synthesis. On the other hand, FlhF and FleN were necessary to attain proper flagellar location and number for a fully functional flagellar complement. FleN, along with FleQ and the second messenger c-di-GMP differentially regulated transcription of lapA and the bcs operon, encoding a large adhesion protein and cellulose synthase. FleQ positively regulated the PlapA promoter and activation was antagonized by FleN and c-di-GMP. PbcsD was negatively regulated by FleQ and FleN, and repression was antagonized by c-di-GMP. FleN promoted FleQ binding to both PlapA and PbcsD in vitro, while c-di-GMP antagonized interaction with PbcsD and stimulated interaction with PlapA. A single FleQ binding site in PlapA was critical to activation in vivo. Our results suggest that FleQ, FleN and c-di-GMP cooperate to coordinate the regulation of flagellar motility and biofilm development.
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Affiliation(s)
- Blanca Navarrete
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide/Consejo Superior de Investigaciones Científicas/Junta de Andalucía, Sevilla, Spain
- Departamento de Biología Molecular e Ingeniería Bioquímica, Universidad Pablo de Olavide, Sevilla, Spain
| | - Antonio Leal-Morales
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide/Consejo Superior de Investigaciones Científicas/Junta de Andalucía, Sevilla, Spain
- Departamento de Biología Molecular e Ingeniería Bioquímica, Universidad Pablo de Olavide, Sevilla, Spain
| | - Laura Serrano-Ron
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide/Consejo Superior de Investigaciones Científicas/Junta de Andalucía, Sevilla, Spain
- Departamento de Biología Molecular e Ingeniería Bioquímica, Universidad Pablo de Olavide, Sevilla, Spain
| | - Marina Sarrió
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide/Consejo Superior de Investigaciones Científicas/Junta de Andalucía, Sevilla, Spain
- Departamento de Biología Molecular e Ingeniería Bioquímica, Universidad Pablo de Olavide, Sevilla, Spain
| | - Alicia Jiménez-Fernández
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide/Consejo Superior de Investigaciones Científicas/Junta de Andalucía, Sevilla, Spain
- Departamento de Biología Molecular e Ingeniería Bioquímica, Universidad Pablo de Olavide, Sevilla, Spain
| | - Lorena Jiménez-Díaz
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide/Consejo Superior de Investigaciones Científicas/Junta de Andalucía, Sevilla, Spain
- Departamento de Biología Molecular e Ingeniería Bioquímica, Universidad Pablo de Olavide, Sevilla, Spain
| | - Aroa López-Sánchez
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide/Consejo Superior de Investigaciones Científicas/Junta de Andalucía, Sevilla, Spain
- Departamento de Biología Molecular e Ingeniería Bioquímica, Universidad Pablo de Olavide, Sevilla, Spain
| | - Fernando Govantes
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide/Consejo Superior de Investigaciones Científicas/Junta de Andalucía, Sevilla, Spain
- Departamento de Biología Molecular e Ingeniería Bioquímica, Universidad Pablo de Olavide, Sevilla, Spain
- * E-mail:
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240
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Potential of oxygen and nitrogen reactive intermediates to disperse Listeria monocytogenes from biofilms. Braz J Microbiol 2019; 50:501-506. [PMID: 30864077 DOI: 10.1007/s42770-019-00069-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 12/07/2018] [Indexed: 01/22/2023] Open
Abstract
Studying biofilm dispersal is important to prevent Listeria monocytogenes persistence in food processing plants and to avoid finished product contamination. Reactive oxygen and nitrogen intermediates (ROI and RNI, respectively) may trigger cell detachment from many bacterial species biofilms, but their roles in L. monocytogenes biofilms have not been fully investigated. This study reports on ROI and RNI quantification in Listeria monocytogenes biofilms formed on stainless steel and glass surfaces; bacterial culture and microscopy combined with fluorescent staining were employed. Nitric oxide (NO) donor and inhibitor putative effects on L. monocytogenes dispersal from biofilms were evaluated, and transcription of genes (prfA, lmo 0990, lmo 0807, and lmo1485) involved in ROI and RNI stress responses were quantified by real-time PCR (qPCR). Microscopy detected the reactive intermediates NO, peroxynitrite, H2O2, and superoxide in L. monocytogenes biofilms. Neither NO donor nor inhibitors interfered in L. monocytogenes growth and gene expression, except for lmo0990, which was downregulated. In conclusion, ROI and RNI did not exert dispersive effects on L. monocytogenes biofilms, indicating that this pathogen has a tight control for protection against oxidative and nitrosative stresses.
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241
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Pyruvate-depleting conditions induce biofilm dispersion and enhance the efficacy of antibiotics in killing biofilms in vitro and in vivo. Sci Rep 2019; 9:3763. [PMID: 30842579 PMCID: PMC6403282 DOI: 10.1038/s41598-019-40378-z] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 02/14/2019] [Indexed: 01/09/2023] Open
Abstract
The formation of biofilms is a developmental process initiated by planktonic cells transitioning to the surface, which comes full circle when cells disperse from the biofilm and transition to the planktonic mode of growth. Considering that pyruvate has been previously demonstrated to be required for the formation of P. aeruginosa biofilms, we asked whether pyruvate likewise contributes to the maintenance of the biofilm structure, with depletion of pyruvate resulting in dispersion. Here, we demonstrate that the enzymatic depletion of pyruvate coincided with the dispersion of established biofilms by S. aureus and laboratory and clinical P. aeruginosa isolates. The dispersion response was dependent on pyruvate fermentation pathway components but independent of proteins previously described to contribute to P. aeruginosa biofilm dispersion. Using porcine second-degree burn wounds infected with P. aeruginosa biofilm cells, we furthermore demonstrated that pyruvate depletion resulted in a reduction of biofilm biomass in vivo. Pyruvate-depleting conditions enhanced the efficacy of tobramycin killing of the resident wound biofilms by up to 5-logs. Our findings strongly suggest the management of pyruvate availability to be a promising strategy to combat biofilm-related infections by two principal pathogens associated with wound and cystic fibrosis lung infections.
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242
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Zhang Z, Deng Y, Feng K, Cai W, Li S, Yin H, Xu M, Ning D, Qu Y. Deterministic Assembly and Diversity Gradient Altered the Biofilm Community Performances of Bioreactors. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:1315-1324. [PMID: 30615833 DOI: 10.1021/acs.est.8b06044] [Citation(s) in RCA: 94] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Community assembly process (determinism vs stochasticity) determines the composition and diversity of a microbial community, and then shapes its functions. Understanding this complex process and its relationship to the community functions becomes a very important task for the applications of microbial biotechnology. In this study, we applied microbial electrolysis cells (MECs) with moderate species numbers and easily tractable functions as a model ecosystem, and constructed a series of biofilm communities with gradient biodiversity to examine the roles of community assembly in determining microbial community structure and functions. After stable biofilms formed, the best MEC reactor performances (e.g., gas productivity, total energy efficiency) were achieved in the group in which biofilms had the second highest α-diversity, and biofilms with even lower diversity showed declining performance. Null model analyses indicated that both deterministic and stochastic assembly played roles in the formation of biofilm communities. When deterministic assembly dominates this formation, the higher diversity of the biofilm community would generally show better reactor performance. However, when the stochasticity dominates the assembly process, the bioreactor performance would decline. This study provides novel evidence that the assembly mechanism could be one of the key processes to shift the functions, and proposes an important guidance for selecting the most efficient microorganisms for environmental biotechnologies.
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Affiliation(s)
- Zhaojing Zhang
- Institute for Marine Science and Technology , Shandong University , Qingdao 266237 , P. R. China
- State Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , P. R. China
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
| | - Ye Deng
- Institute for Marine Science and Technology , Shandong University , Qingdao 266237 , P. R. China
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- College of Resources and Environment , University of Chinese Academy of Sciences , Beijing 100190 , P. R. China
| | - Kai Feng
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
| | - Weiwei Cai
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- School of Civil Engineering , Beijing Jiaotong University , Beijing 100044 , P. R. China
| | - Shuzhen Li
- State Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , P. R. China
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
| | - Huaqun Yin
- School of Minerals Processing and Bioengineering , Central South University , Changsha 410083 , P. R. China
| | - Meiying Xu
- State Key Laboratory of Applied Microbiology Southern China , Guangdong Institute of Microbiology , Guangzhou 510070 , P. R. China
| | - Daliang Ning
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, and School of Civil Engineering and Environmental Science , University of Oklahoma , Norman , Oklahoma 73019 , United States
| | - Yuanyuan Qu
- State Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , P. R. China
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243
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Motility, Biofilm Formation and Antimicrobial Efflux of Sessile and Planktonic Cells of Achromobacter xylosoxidans. Pathogens 2019; 8:pathogens8010014. [PMID: 30691200 PMCID: PMC6471707 DOI: 10.3390/pathogens8010014] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 01/18/2019] [Accepted: 01/24/2019] [Indexed: 11/17/2022] Open
Abstract
Achromobacter xylosoxidans is an innately multidrug-resistant bacterium capable of forming biofilms in the respiratory tract of cystic fibrosis (CF) patients. During the transition from the planktonic stage to biofilm growth, bacteria undergo a transcriptionally regulated differentiation. An isolate of A. xylosoxidans cultured from the sputum of a CF patient was separated into sessile and planktonic stages in vitro, and the transcriptomes were compared. The selected genes of interest were subsequently inactivated, and flagellar motility was found to be decisive for biofilm formation in vitro. The spectrum of a new resistance-nodulation-cell division (RND)-type multidrug efflux pump (AxyEF-OprN) was characterized by inactivation of the membrane fusion protein. AxyEF-OprN is capable of extruding some fluoroquinolones (levofloxacin and ciprofloxacin), tetracyclines (doxycycline and tigecycline) and carpabenems (ertapenem and imipenem), which are classes of antimicrobials that are widely used for treatment of CF pulmonary infections.
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244
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Identification of DR75-RS11090 Gene Encoding GGDEF Domains, and its Role in Enterococcus faecalis. Jundishapur J Microbiol 2019. [DOI: 10.5812/jjm.83394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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245
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Su Y, Tang K, Liu J, Wang Y, Zheng Y, Zhang XH. Quorum Sensing System of Ruegeria mobilis Rm01 Controls Lipase and Biofilm Formation. Front Microbiol 2019; 9:3304. [PMID: 30687283 PMCID: PMC6333666 DOI: 10.3389/fmicb.2018.03304] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Accepted: 12/19/2018] [Indexed: 01/02/2023] Open
Abstract
Quorum sensing (QS) promotes in situ extracellular enzyme (EE) activity via the exogenous signal N-acylhomoserine lactone (AHL), which facilitates marine particle degradation, but the species that engage in this regulatory mechanism remain unclear. Here, we obtained AHL-producing and AHL-degrading strains from marine particles. The strain Ruegeria mobilis Rm01 of the Roseobacter group (RBG), which was capable of both AHL producing and degrading, was chosen to represent these strains. We demonstrated that Rm01 possessed a complex QS network comprising AHL-based QS and quorum quenching (QQ) systems and autoinducer-2 (AI-2) perception system. Rm01 was able to respond to multiple exogenous QS signals through the QS network. By applying self-generated AHLs and non-self-generated AHLs and AI-2 QS signal molecules, we modulated biofilm formation and lipase production in Rm01, which reflected the coordination of bacterial metabolism with that of other species via eavesdropping on exogenous QS signals. These results suggest that R. mobilis might be one of the participators that could regulate EE activities by responding to QS signals in marine particles.
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Affiliation(s)
- Ying Su
- College of Marine Life Science, Ocean University of China, Qingdao, China.,Weifang Engineering Vocational College, Weifang, China
| | - Kaihao Tang
- College of Marine Life Science, Ocean University of China, Qingdao, China
| | - Jiwen Liu
- College of Marine Life Science, Ocean University of China, Qingdao, China.,Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Yan Wang
- College of Marine Life Science, Ocean University of China, Qingdao, China.,Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Yanfen Zheng
- College of Marine Life Science, Ocean University of China, Qingdao, China
| | - Xiao-Hua Zhang
- College of Marine Life Science, Ocean University of China, Qingdao, China.,Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
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246
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Zurob E, Dennett G, Gentil D, Montero-Silva F, Gerber U, Naulín P, Gómez A, Fuentes R, Lascano S, Rodrigues da Cunha TH, Ramírez C, Henríquez R, Del Campo V, Barrera N, Wilkens M, Parra C. Inhibition of Wild Enterobacter cloacae Biofilm Formation by Nanostructured Graphene- and Hexagonal Boron Nitride-Coated Surfaces. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E49. [PMID: 30609710 PMCID: PMC6358881 DOI: 10.3390/nano9010049] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 12/25/2018] [Accepted: 12/25/2018] [Indexed: 11/17/2022]
Abstract
Although biofilm formation is a very effective mechanism to sustain bacterial life, it is detrimental in medical and industrial sectors. Current strategies to control biofilm proliferation are typically based on biocides, which exhibit a negative environmental impact. In the search for environmentally friendly solutions, nanotechnology opens the possibility to control the interaction between biological systems and colonized surfaces by introducing nanostructured coatings that have the potential to affect bacterial adhesion by modifying surface properties at the same scale. In this work, we present a study on the performance of graphene and hexagonal boron nitride coatings (h-BN) to reduce biofilm formation. In contraposition to planktonic state, we focused on evaluating the efficiency of graphene and h-BN at the irreversible stage of biofilm formation, where most of the biocide solutions have a poor performance. A wild Enterobacter cloacae strain was isolated, from fouling found in a natural environment, and used in these experiments. According to our results, graphene and h-BN coatings modify surface energy and electrostatic interactions with biological systems. This nanoscale modification determines a significant reduction in biofilm formation at its irreversible stage. No bactericidal effects were found, suggesting both coatings offer a biocompatible solution for biofilm and fouling control in a wide range of applications.
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Affiliation(s)
- Elsie Zurob
- Laboratorio Nanobiomateriales, Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
- Laboratorio de Microbiología Básica y Aplicada, Universidad de Santiago de Chile, Avenida Libertador Bernardo O'Higgins 3363, Santiago, Chile.
| | - Geraldine Dennett
- Laboratorio Nanobiomateriales, Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
| | - Dana Gentil
- Laboratorio Nanobiomateriales, Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
| | - Francisco Montero-Silva
- Laboratorio Nanobiomateriales, Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
| | - Ulrike Gerber
- Faculty Environment and Natural Science, Institute of Biotechnology, Brandenburg University of Technology, Universitätsplatz 1, 01968 Senftenberg, Germany.
| | - Pamela Naulín
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, Santiago, Chile.
| | - Andrea Gómez
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, Santiago, Chile.
| | - Raúl Fuentes
- Departamento de Industrias, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
| | - Sheila Lascano
- Departamento de Mecánica, Universidad Técnica Federico Santa María, Avda. Vicuña Mackenna 3939, Santiago, Chile.
| | | | - Cristian Ramírez
- Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
| | - Ricardo Henríquez
- Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
| | - Valeria Del Campo
- Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
| | - Nelson Barrera
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, Santiago, Chile.
| | - Marcela Wilkens
- Laboratorio de Microbiología Básica y Aplicada, Universidad de Santiago de Chile, Avenida Libertador Bernardo O'Higgins 3363, Santiago, Chile.
| | - Carolina Parra
- Laboratorio Nanobiomateriales, Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
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247
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Li Y, Han H, Yin J, He X, Tang Z, Li T, Yao K, Yin Y. d- andl-Aspartate regulates growth performance, inflammation and intestinal microbial community in young pigs. Food Funct 2019; 10:1028-1037. [DOI: 10.1039/c8fo01410h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Dietary 1%d-Asp andl-Asp affect the growth performance and inflammation in young pigs, which might be associated with gut microbiota.
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Affiliation(s)
- Yuying Li
- Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process; Key Laboratory of Agro-ecological Processes in Subtropical Region
- Institute of Subtropical Agriculture
- Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central
- Ministry of Agriculture
- Changsha
| | - Hui Han
- Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process; Key Laboratory of Agro-ecological Processes in Subtropical Region
- Institute of Subtropical Agriculture
- Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central
- Ministry of Agriculture
- Changsha
| | - Jie Yin
- Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process; Key Laboratory of Agro-ecological Processes in Subtropical Region
- Institute of Subtropical Agriculture
- Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central
- Ministry of Agriculture
- Changsha
| | - Xingguo He
- Changsha LvYe Bio-technology Co
- Ltd
- Changsha
- China
| | - Zhiyi Tang
- Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process; Key Laboratory of Agro-ecological Processes in Subtropical Region
- Institute of Subtropical Agriculture
- Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central
- Ministry of Agriculture
- Changsha
| | - Tiejun Li
- Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process; Key Laboratory of Agro-ecological Processes in Subtropical Region
- Institute of Subtropical Agriculture
- Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central
- Ministry of Agriculture
- Changsha
| | - Kang Yao
- Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process; Key Laboratory of Agro-ecological Processes in Subtropical Region
- Institute of Subtropical Agriculture
- Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central
- Ministry of Agriculture
- Changsha
| | - Yulong Yin
- Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process; Key Laboratory of Agro-ecological Processes in Subtropical Region
- Institute of Subtropical Agriculture
- Chinese Academy of Sciences; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central
- Ministry of Agriculture
- Changsha
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248
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Mathematical modeling of dispersal phenomenon in biofilms. Math Biosci 2019; 307:70-87. [DOI: 10.1016/j.mbs.2018.07.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 12/05/2017] [Accepted: 07/24/2018] [Indexed: 02/05/2023]
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249
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Woehlk H, Trimble MJ, Mansour SC, Pletzer D, Trouillet V, Welle A, Barner L, Hancock REW, Barner-Kowollik C, Fairfull-Smith KE. Controlling biofilm formation with nitroxide functional surfaces. Polym Chem 2019. [DOI: 10.1039/c9py00690g] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nitroxide functional polymer coatings with inherent antibiofilm activity are introduced as an avenue to combat bacterial biofilm contamination of medical devices.
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250
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Falcón García C, Stangl F, Götz A, Zhao W, Sieber SA, Opitz M, Lieleg O. Topographical alterations render bacterial biofilms susceptible to chemical and mechanical stress. Biomater Sci 2019; 7:220-232. [DOI: 10.1039/c8bm00987b] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Treatment with concentrated ethanol, saline or glucose solutions smoothens biofilm surface topography and initially superhydrophobic/omniphobic biofilms are rendered hydrophilic.
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Affiliation(s)
- Carolina Falcón García
- Department of Mechanical Engineering and Munich School of Bioengineering
- Technical University of Munich
- 85748 Garching
- Germany
| | - Felix Stangl
- Department of Mechanical Engineering and Munich School of Bioengineering
- Technical University of Munich
- 85748 Garching
- Germany
| | - Alexandra Götz
- Center for NanoScience
- Faculty of Physics
- Ludwig-Maximilians-Universität München
- Munich
- Germany
| | - Weining Zhao
- Department of Chemistry
- Chair for Organic Chemistry II
- Technical University of Munich
- 85748 Garching
- Germany
| | - Stephan A. Sieber
- Department of Chemistry
- Chair for Organic Chemistry II
- Technical University of Munich
- 85748 Garching
- Germany
| | - Madeleine Opitz
- Center for NanoScience
- Faculty of Physics
- Ludwig-Maximilians-Universität München
- Munich
- Germany
| | - Oliver Lieleg
- Department of Mechanical Engineering and Munich School of Bioengineering
- Technical University of Munich
- 85748 Garching
- Germany
| |
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