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Dsouza FP, Dinesh S, Sharma S. Understanding the intricacies of microbial biofilm formation and its endurance in chronic infections: a key to advancing biofilm-targeted therapeutic strategies. Arch Microbiol 2024; 206:85. [PMID: 38300317 DOI: 10.1007/s00203-023-03802-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/04/2023] [Accepted: 12/16/2023] [Indexed: 02/02/2024]
Abstract
Bacterial biofilms can adhere to various surfaces in the environment with human beings being no exception. Enclosed in a self-secreted matrix which contains extracellular polymeric substances, biofilms are intricate communities of bacteria that play a significant role across various sectors and raise concerns for public health, medicine and industries. These complex structures allow free-floating planktonic cells to adopt multicellular mode of growth which leads to persistent infections. This is of great concern as biofilms can withstand external attacks which include antibiotics and immune responses. A more comprehensive and innovative approach to therapy is needed in view of the increasing issue of bacterial resistance brought on by the overuse of conventional antimicrobial medications. Thus, to oppose the challenges posed by biofilm-related infections, innovative therapeutic strategies are being explored which include targeting extracellular polymeric substances, quorum sensing, and persister cells. Biofilm-responsive nanoparticles show promising results by improving drug delivery and reducing the side effects. This review comprehensively examines the factors influencing biofilm formation, host immune defence mechanisms, infections caused by biofilms, diagnostic approaches, and biofilm-targeted therapies.
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Affiliation(s)
| | - Susha Dinesh
- Department of Bioinformatics, BioNome, Bengaluru, Karnataka, 560043, India.
| | - Sameer Sharma
- Department of Bioinformatics, BioNome, Bengaluru, Karnataka, 560043, India
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2
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Hashmi HB, Farooq MA, Khan MH, Alshammari A, Aljasham AT, Rashid SA, Khan NR, Hashmi IB, Badar M, Mubarak MS. Collaterally Sensitive β-Lactam Drugs as an Effective Therapy against the Pre-Existing Methicillin Resistant Staphylococcus aureus (MRSA) Biofilms. Pharmaceuticals (Basel) 2023; 16:ph16050687. [PMID: 37242471 DOI: 10.3390/ph16050687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 04/01/2023] [Accepted: 04/25/2023] [Indexed: 05/28/2023] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is among the leading causes of nosocomial infections and forms biofilms, which are difficult to eradicate because of their increasing resistance to antimicrobial agents. This is especially true for pre-existing biofilms. The current study focused on evaluating the efficacy of three β-lactam drugs, meropenem, piperacillin, and tazobactam, alone and in combination against the MRSA biofilms. When used individually, none of the drugs exhibited significant antibacterial activity against MRSA in a planktonic state. At the same time, the combination of meropenem, piperacillin, and tazobactam showed a 41.7 and 41.3% reduction in planktonic bacterial cell growth, respectively. These drugs were further assessed for biofilm inhibition and removal. The combination of meropenem, piperacillin, and tazobactam caused 44.3% biofilm inhibition, while the rest of the combinations did not show any significant effects. Results also revealed that piperacillin and tazobactam exhibited the best synergy against the pre-formed biofilm of MRSA, with 46% removal. However, adding meropenem to the piperacillin and tazobactam combination showed a slightly reduced activity towards the pre-formed biofilm of MRSA and removed 38.7% of it. Although the mechanism of synergism is not fully understood, our findings suggest that these three β-lactam drugs can be used in combination as very effective therapeutic agents for the treatment of pre-existing MRSA biofilms. The in vivo experiments on the antibiofilm activity of these drugs will pave the way for applying such synergistic combinations to clinics.
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Affiliation(s)
- Hamna Batool Hashmi
- Gomal Center of Biochemistry and Biotechnology, Gomal University, Dera Ismail Khan 29050, Pakistan
| | - Muhammad Asad Farooq
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, Shanghai 200062, China
| | - Muhammad Hashim Khan
- Gomal Center of Biochemistry and Biotechnology, Gomal University, Dera Ismail Khan 29050, Pakistan
| | - Abdulrahman Alshammari
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Alanoud T Aljasham
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Sheikh Abdur Rashid
- Nanocarriers Research Laboratory, Gomal Centre of Pharmaceutical Sciences, Faculty of Pharmacy, Gomal University, Dera Ismail Khan 29050, Pakistan
| | - Nauman Rahim Khan
- Department of Pharmacy, Kohat University of Science and Technology, Kohat 26000, Pakistan
| | - Irum Batool Hashmi
- Department of Obstetrics and Gynecology, Gomal Medical College, Dera Ismail Khan 29050, Pakistan
| | - Muhammad Badar
- Gomal Center of Biochemistry and Biotechnology, Gomal University, Dera Ismail Khan 29050, Pakistan
| | - Mohammad S Mubarak
- Department of Chemistry, The University of Jordan, Amma 11942, Jordan
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA
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Gomes AR, Pires AS, Roleira FMF, Tavares-da-Silva EJ. The Structural Diversity and Biological Activity of Steroid Oximes. Molecules 2023; 28:molecules28041690. [PMID: 36838678 PMCID: PMC9967121 DOI: 10.3390/molecules28041690] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 02/01/2023] [Accepted: 02/06/2023] [Indexed: 02/12/2023] Open
Abstract
Steroids and their derivatives have been the subject of extensive research among investigators due to their wide range of pharmacological properties, in which steroidal oximes are included. Oximes are a chemical group with the general formula R1R2C=N-OH and they exist as colorless crystals and are poorly soluble in water. Oximes can be easily obtained through the condensation of aldehydes or ketones with various amine derivatives, making them a very interesting chemical group in medicinal chemistry for the design of drugs as potential treatments for several diseases. In this review, we will focus on the different biological activities displayed by steroidal oximes such as anticancer, anti-inflammatory, antibacterial, antifungal and antiviral, among others, as well as their respective mechanisms of action. An overview of the chemistry of oximes will also be reported, and several steroidal oximes that are in clinical trials or already used as drugs are described. An extensive literature search was performed on three main databases-PubMed, Web of Science, and Google Scholar.
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Affiliation(s)
- Ana R. Gomes
- Univ Coimbra, CIEPQPF, Faculty of Pharmacy, Laboratory of Pharmaceutical Chemistry, Azinhaga de Santa Comba, Pólo III - Pólo das Ciências da Saúde, 3000-548 Coimbra, Portugal
- Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research (iCBR) area of Environment Genetics and Oncobiology (CIMAGO), Institute of Biophysics, Faculty of Medicine, Azinhaga de Santa Comba, Pólo III - Pólo das Ciências da Saúde, 3000-548 Coimbra, Portugal
| | - Ana S. Pires
- Univ Coimbra, Coimbra Institute for Clinical and Biomedical Research (iCBR) area of Environment Genetics and Oncobiology (CIMAGO), Institute of Biophysics, Faculty of Medicine, Azinhaga de Santa Comba, Pólo III - Pólo das Ciências da Saúde, 3000-548 Coimbra, Portugal
- Clinical Academic Center of Coimbra (CACC), Praceta Professor Mota Pinto, 3004-561 Coimbra, Portugal
- Univ Coimbra, Center for Innovative Biomedicine and Biotechnology (CIBB), Rua Larga, 3004-504 Coimbra, Portugal
| | - Fernanda M. F. Roleira
- Univ Coimbra, CIEPQPF, Faculty of Pharmacy, Laboratory of Pharmaceutical Chemistry, Azinhaga de Santa Comba, Pólo III - Pólo das Ciências da Saúde, 3000-548 Coimbra, Portugal
- Correspondence: (F.M.F.R.); (E.J.T.-d.-S.); Tel.: +351-239-488-400 (F.M.F.R. & E.J.T.-d.-S.); Fax: +351-239-488-503 (F.M.F.R. & E.J.T.-d.-S.)
| | - Elisiário J. Tavares-da-Silva
- Univ Coimbra, CIEPQPF, Faculty of Pharmacy, Laboratory of Pharmaceutical Chemistry, Azinhaga de Santa Comba, Pólo III - Pólo das Ciências da Saúde, 3000-548 Coimbra, Portugal
- Correspondence: (F.M.F.R.); (E.J.T.-d.-S.); Tel.: +351-239-488-400 (F.M.F.R. & E.J.T.-d.-S.); Fax: +351-239-488-503 (F.M.F.R. & E.J.T.-d.-S.)
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Anti-biofilm activity of biochanin A against Staphylococcus aureus. Appl Microbiol Biotechnol 2023; 107:867-879. [PMID: 36585511 DOI: 10.1007/s00253-022-12350-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 12/06/2022] [Accepted: 12/22/2022] [Indexed: 01/01/2023]
Abstract
Biofilm-forming Staphylococcus aureus can easily accumulate on various food contact surfaces which induce cross-contamination and are difficult to eliminate in the food industry. This study aimed to evaluate the anti-biofilm effects of natural product biochanin A against S. aureus. Results showed that biochanin A effectively eradicated established S. aureus biofilms on different food-contact materials. Fluorescence microscopic analyses suggested that biochanin A disintegrated the established biofilms by dissociate extracellular polymeric substance (EPS) in matrix. In addition, biochanin A at the sub-MIC concentration also effectively inhibited the biofilm formation by regulating the expression of biofilm-related genes (icaA, srtA, eno) and suppressing the release of EPS in biofilm matrix. Molecular docking also demonstrated that biochanin A conducted strong interactions with biofilm-related proteins (Ica A, Sortase A, and Enolase). These findings demonstrated that biochanin A has the potential to be developed as a potent agent against S. aureus biofilm in food industries. KEY POINTS: • Anti-biofilm effect of biochanin A against S. aureus was revealed for the first time. • Biofilm of S. aureus on various food-contact surfaces were efficiently eradicated. • Biochanin A prevented S. aureus biofilm formation via reducing EPS production.
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Kiousi DE, Efstathiou C, Tzampazlis V, Plessas S, Panopoulou M, Koffa M, Galanis A. Genetic and phenotypic assessment of the antimicrobial activity of three potential probiotic lactobacilli against human enteropathogenic bacteria. Front Cell Infect Microbiol 2023; 13:1127256. [PMID: 36844407 PMCID: PMC9944596 DOI: 10.3389/fcimb.2023.1127256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 01/30/2023] [Indexed: 02/11/2023] Open
Abstract
Introduction Lactobacilli are avid producers of antimicrobial compounds responsible for their adaptation and survival in microbe-rich matrices. The bactericidal or bacteriostatic ability of lactic acid bacteria (LAB) can be exploited for the identification of novel antimicrobial compounds to be incorporated in functional foodstuffs or pharmaceutical supplements. In this study, the antimicrobial and antibiofilm properties of Lactiplantibacillus pentosus L33, Lactiplantibacillus plantarum L125 and Lacticaseibacillus paracasei SP5, previously isolated form fermented products, were examined, against clinical isolates of Staphylococcus aureus, Salmonella enterica subsp. enterica serovar Enteritidis and Escherichia coli. Methods The ability of viable cells to inhibit pathogen colonization on HT-29 cell monolayers, as well as their co-aggregation capacity, were examined utilizing the competitive exclusion assay. The antimicrobial activity of cell-free culture supernatants (CFCS) was determined against planktonic cells and biofilms, using microbiological assays, confocal microscopy, and gene expression analysis of biofilm formation-related genes. Furthermore, in vitro analysis was supplemented with in silico prediction of bacteriocin clusters and of other loci involved in antimicrobial activity. Results The three lactobacilli were able to limit the viability of planktonic cells of S. aureus and E. coli in suspension. Greater inhibition of biofilm formation was recorded after co-incubation of S. enterica with the CFCS of Lc. paracasei SP5. Predictions based on sequence revealed the ability of strains to produce single or two-peptide Class II bacteriocins, presenting sequence and structural conservation with functional bacteriocins. Discussion The efficiency of the potentially probiotic bacteria to elicit antimicrobial effects presented a strain- and pathogen-specific pattern. Future studies, utilizing multi-omic approaches, will focus on the structural and functional characterization of molecules involved in the recorded phenotypes.
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Affiliation(s)
- Despoina Eugenia Kiousi
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, Alexandroupolis, Greece
| | - Christos Efstathiou
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, Alexandroupolis, Greece
| | - Vasilis Tzampazlis
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, Alexandroupolis, Greece
| | - Stavros Plessas
- Department of Agricultural Development, Democritus University of Thrace, Orestiada, Greece
| | - Maria Panopoulou
- Department of Medicine, Faculty of Health Sciences, Democritus University of Thrace, Alexandroupolis, Greece
| | - Maria Koffa
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, Alexandroupolis, Greece
| | - Alex Galanis
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, Alexandroupolis, Greece
- *Correspondence: Alex Galanis,
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Small-Molecule-Induced Activation of Cellular Respiration Inhibits Biofilm Formation and Triggers Metabolic Remodeling in Staphylococcus aureus. mBio 2022; 13:e0084522. [PMID: 35852317 PMCID: PMC9426486 DOI: 10.1128/mbio.00845-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Staphylococcus aureus, a major pathogen of community-acquired and nosocomial-associated infections, forms biofilms consisting of extracellular matrix-embedded cell aggregates. S. aureus biofilm formation on implanted medical devices can cause local and systemic infections due to the dispersion of cells from the biofilms. Usually, conventional antibiotic treatments are not effective against biofilm-related infections, and there is no effective treatment other than removing the contaminated devices. Therefore, the development of new therapeutic agents to combat biofilm-related infections is urgently needed. We conducted high-throughput screening of S. aureus biofilm inhibitors and obtained a small compound, JBD1. JBD1 strongly inhibits biofilm formation of S. aureus, including methicillin-resistant strains. In addition, JBD1 activated the respiratory activity of S. aureus cells and increased the sensitivity to aminoglycosides. Furthermore, it was shown that the metabolic profile of S. aureus was significantly altered in the presence of JBD1 and that metabolic remodeling was induced. Surprisingly, these JBD1-induced phenotypes were blocked by adding an excess amount of the electron carrier menaquinone to suppress respiratory activation. These results indicate that JBD1 induces biofilm inhibition and metabolic remodeling through respiratory activation. This study demonstrates that compounds that enhance the respiratory activity of S. aureus may be potential leads in the development of therapeutic agents for chronic S. aureus-biofilm-related infections.
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TMT proteomic analysis for molecular mechanism of Staphylococcus aureus in response to freezing stress. Appl Microbiol Biotechnol 2022; 106:3139-3152. [PMID: 35460349 DOI: 10.1007/s00253-022-11927-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 04/07/2022] [Accepted: 04/11/2022] [Indexed: 11/02/2022]
Abstract
The foodborne pathogen Staphylococcus aureus continues to challenge the food industry due to the pathogenicity and tolerance of the bacterium. As a common storage condition for frozen food during transportation, distribution, and storage, freezing does not seem to be entirely safe due to the cold tolerance of S. aureus. In addition, our study indicated that the biofilm formation ability of S. aureus was significantly increased in response to freezing stress. To explore the molecular mechanism regulating the response to freezing stress, the proteomics signature of S. aureus after freezing stress based on tandem mass tag (TMT) labeling and liquid chromatography tandem mass spectrometry (LC-MS/MS) was analyzed. Gene Ontology and pathway analysis revealed that ribosome function, metabolism, RNA repair, and stress response proteins were differentially regulated (P < 0.05). Furthermore, transpeptidase sortase A, biofilm operon icaADBC HTH-type negative transcriptional regulator IcaR, and HTH-type transcriptional regulator MgrA were involved in the modulation of increased biofilm formation in response to freezing stress (P < 0.05). Moreover, significant lysine acetylation and malonylation signals in the S. aureus response to freezing stress were observed. Collectively, the current work provides additional insight for comprehending the molecular mechanism of S. aureus in response to freezing stress and presents potential targets for developing strategies to control S. aureus. KEY POINTS: • TMT proteomic analysis was first used on S. aureus in response to freezing stress. • Ribosome-, metabolism-, and biofilm-related proteins change after freezing stress. • Increased biofilm formation in S. aureus responded to freezing stress.
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Chiba A, Seki M, Suzuki Y, Kinjo Y, Mizunoe Y, Sugimoto S. Staphylococcus aureus utilizes environmental RNA as a building material in specific polysaccharide-dependent biofilms. NPJ Biofilms Microbiomes 2022; 8:17. [PMID: 35379830 PMCID: PMC8980062 DOI: 10.1038/s41522-022-00278-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 02/21/2022] [Indexed: 11/24/2022] Open
Abstract
Biofilms are surface-bound microbial communities that are typically embedded in a matrix of self-produced extracellular polymeric substances and can cause chronic infections. Extracellular DNA is known to play a crucial role in biofilm development in diverse bacteria; however, the existence and function of RNA are poorly understood. Here, we show that RNA contributes to the structural integrity of biofilms formed by the human pathogen Staphylococcus aureus. RNase A dispersed both fresh and mature biofilms, indicating the importance of RNA at various stages. RNA-sequencing analysis demonstrated that the primary source of RNA in the biofilm matrix was the Brain Heart Infusion medium (>99.32%). RNA purified from the medium promoted biofilm formation. Microscopic and molecular interaction analyses demonstrated that polysaccharides were critical for capturing and stabilizing external RNA in biofilms, which contributes to biofilm organization. These findings provide a basis for exploring the role of externally derived substances in bacterial biofilm organization.
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Bouchelaghem S, Das S, Naorem RS, Czuni L, Papp G, Kocsis M. Evaluation of Total Phenolic and Flavonoid Contents, Antibacterial and Antibiofilm Activities of Hungarian Propolis Ethanolic Extract against Staphylococcus aureus. Molecules 2022; 27:574. [PMID: 35056886 PMCID: PMC8782033 DOI: 10.3390/molecules27020574] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 01/12/2022] [Accepted: 01/13/2022] [Indexed: 11/24/2022] Open
Abstract
Propolis is a natural bee product that is widely used in folk medicine. This study aimed to evaluate the antimicrobial and antibiofilm activities of ethanolic extract of propolis (EEP) on methicillin-resistant and sensitive Staphylococcus aureus (MRSA and MSSA). Propolis samples were collected from six regions in Hungary. The minimum inhibitory concentrations (MIC) values and the interaction of EEP-antibiotics were evaluated by the broth microdilution and the chequerboard broth microdilution methods, respectively. The effect of EEP on biofilm formation and eradication was estimated by crystal violet assay. Resazurin/propidium iodide dyes were applied for simultaneous quantification of cellular metabolic activities and dead cells in mature biofilms. The EEP1 sample showed the highest phenolic and flavonoid contents. The EEP1 successfully prevented the growth of planktonic cells of S. aureus (MIC value = 50 µg/mL). Synergistic interactions were shown after the co-exposition to EEP1 and vancomycin at 108 CFU/mL. The EEP1 effectively inhibited the biofilm formation and caused significant degradation of mature biofilms (50-200 µg/mL), as a consequence of the considerable decrement of metabolic activity. The EEP acts effectively as an antimicrobial and antibiofilm agent on S. aureus. Moreover, the simultaneous application of EEP and vancomycin could enhance their effect against MRSA infection.
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Affiliation(s)
- Sarra Bouchelaghem
- Department of General and Environmental Microbiology, Institute of Biology, University of Pécs, Ifjúság Str. 6, 7624 Pécs, Hungary; (S.B.); (R.S.N.); (L.C.); (G.P.)
| | - Sourav Das
- Department of Laboratory Medicine, Medical School, University of Pécs, Ifjúság Str. 13, 7624 Pécs, Hungary;
| | - Romen Singh Naorem
- Department of General and Environmental Microbiology, Institute of Biology, University of Pécs, Ifjúság Str. 6, 7624 Pécs, Hungary; (S.B.); (R.S.N.); (L.C.); (G.P.)
| | - Lilla Czuni
- Department of General and Environmental Microbiology, Institute of Biology, University of Pécs, Ifjúság Str. 6, 7624 Pécs, Hungary; (S.B.); (R.S.N.); (L.C.); (G.P.)
| | - Gábor Papp
- Department of General and Environmental Microbiology, Institute of Biology, University of Pécs, Ifjúság Str. 6, 7624 Pécs, Hungary; (S.B.); (R.S.N.); (L.C.); (G.P.)
| | - Marianna Kocsis
- Department of Plant Biology, Institute of Biology, University of Pécs, Ifjúság str. 6, 7624 Pécs, Hungary
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Luong P, Dube DH. Dismantling the bacterial glycocalyx: Chemical tools to probe, perturb, and image bacterial glycans. Bioorg Med Chem 2021; 42:116268. [PMID: 34130219 DOI: 10.1016/j.bmc.2021.116268] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 05/27/2021] [Accepted: 06/01/2021] [Indexed: 12/20/2022]
Abstract
The bacterial glycocalyx is a quintessential drug target comprised of structurally distinct glycans. Bacterial glycans bear unusual monosaccharide building blocks whose proper construction is critical for bacterial fitness, survival, and colonization in the human host. Despite their appeal as therapeutic targets, bacterial glycans are difficult to study due to the presence of rare bacterial monosaccharides that are linked and modified in atypical manners. Their structural complexity ultimately hampers their analytical characterization. This review highlights recent advances in bacterial chemical glycobiology and focuses on the development of chemical tools to probe, perturb, and image bacterial glycans and their biosynthesis. Current technologies have enabled the study of bacterial glycosylation machinery even in the absence of detailed structural information.
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Affiliation(s)
- Phuong Luong
- Department of Chemistry & Biochemistry, Bowdoin College, 6600 College Station, Brunswick, ME 04011, USA
| | - Danielle H Dube
- Department of Chemistry & Biochemistry, Bowdoin College, 6600 College Station, Brunswick, ME 04011, USA.
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Zhang S, Qu X, Tang H, Wang Y, Yang H, Yuan W, Yue B. Diclofenac Resensitizes Methicillin-Resistant Staphylococcus aureus to β-Lactams and Prevents Implant Infections. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2100681. [PMID: 34258168 PMCID: PMC8261494 DOI: 10.1002/advs.202100681] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/12/2021] [Indexed: 05/25/2023]
Abstract
Implant infections caused by methicillin-resistant Staphylococcus aureus (MRSA) can cause major complications during the perioperative period. Diclofenac, one of the most widely used nonsteroidal anti-inflammatory drugs, is often used to relieve pain and inflammation. In this study, it is found that high-dose diclofenac can inhibit the growth of MRSA, and does not easily induce drug-resistant mutations after continuous passage. However, low-doses diclofenac can resensitize bacteria to β-lactams, which help to circumvent drug resistance and improve the antibacterial efficacy of conventional antibiotics. Further, low-dose diclofenac in combination with β-lactams inhibit MRSA associated biofilm formation in implants. Transcriptomic and proteomic analyses indicate that diclofenac can reduce the expression of genes and proteins associated with β-lactam resistance: mecA, mecR, and blaZ; peptidoglycan biosynthesis: murA, murC, femA, and femB; and biofilm formation: altE and fnbP. Murine implant infection models indicate that diclofenac combined with β-lactams, can substantially alleviate MRSA infections in vivo. In addition, it is investigated that low dose diclofenac can inhibit MRSA antibiotic resistance via the mecA/blaZ pathway and related biofilms in implants. The synergistic effect of diclofenac and β-lactams might have promising applications for preventing perioperative infection, considering its multitarget effects against MRSA.
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Affiliation(s)
- Shutao Zhang
- Department of Bone and Joint Surgery, Department of Orthopedics, Renji Hospital, School of MedicineShanghai Jiaotong UniversityShanghai200127China
| | - Xinhua Qu
- Department of Bone and Joint Surgery, Department of Orthopedics, Renji Hospital, School of MedicineShanghai Jiaotong UniversityShanghai200127China
| | - Haozheng Tang
- Department of Bone and Joint Surgery, Department of Orthopedics, Renji Hospital, School of MedicineShanghai Jiaotong UniversityShanghai200127China
| | - You Wang
- Department of Bone and Joint Surgery, Department of Orthopedics, Renji Hospital, School of MedicineShanghai Jiaotong UniversityShanghai200127China
| | - Hongtao Yang
- Department of Plastic & Reconstructive SurgeryThe Ohio State UniversityColumbusOH43210USA
- School of Medical Science and EngineeringBeihang UniversityBeijing100191China
| | - Weien Yuan
- Engineering Research Center of Cell & Therapeutic AntibodyMinistry of EducationSchool of PharmacyShanghai Jiao Tong UniversityShanghai200240China
| | - Bing Yue
- Department of Bone and Joint Surgery, Department of Orthopedics, Renji Hospital, School of MedicineShanghai Jiaotong UniversityShanghai200127China
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12
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Kranjec C, Morales Angeles D, Torrissen Mårli M, Fernández L, García P, Kjos M, Diep DB. Staphylococcal Biofilms: Challenges and Novel Therapeutic Perspectives. Antibiotics (Basel) 2021; 10:131. [PMID: 33573022 PMCID: PMC7911828 DOI: 10.3390/antibiotics10020131] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 01/21/2021] [Accepted: 01/27/2021] [Indexed: 12/14/2022] Open
Abstract
Staphylococci, like Staphylococcus aureus and S. epidermidis, are common colonizers of the human microbiota. While being harmless in many cases, many virulence factors result in them being opportunistic pathogens and one of the major causes of hospital-acquired infections worldwide. One of these virulence factors is the ability to form biofilms-three-dimensional communities of microorganisms embedded in an extracellular polymeric matrix (EPS). The EPS is composed of polysaccharides, proteins and extracellular DNA, and is finely regulated in response to environmental conditions. This structured environment protects the embedded bacteria from the human immune system and decreases their susceptibility to antimicrobials, making infections caused by staphylococci particularly difficult to treat. With the rise of antibiotic-resistant staphylococci, together with difficulty in removing biofilms, there is a great need for new treatment strategies. The purpose of this review is to provide an overview of our current knowledge of the stages of biofilm development and what difficulties may arise when trying to eradicate staphylococcal biofilms. Furthermore, we look into promising targets and therapeutic methods, including bacteriocins and phage-derived antibiofilm approaches.
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Affiliation(s)
- Christian Kranjec
- Faculty of Chemistry, Biotechnology and Food Science, The Norwegian University of Life Sciences, 1432 Ås, Norway; (C.K.); (D.M.A.); (M.T.M.)
| | - Danae Morales Angeles
- Faculty of Chemistry, Biotechnology and Food Science, The Norwegian University of Life Sciences, 1432 Ås, Norway; (C.K.); (D.M.A.); (M.T.M.)
| | - Marita Torrissen Mårli
- Faculty of Chemistry, Biotechnology and Food Science, The Norwegian University of Life Sciences, 1432 Ås, Norway; (C.K.); (D.M.A.); (M.T.M.)
| | - Lucía Fernández
- Department of Technology and Biotechnology of Dairy Products, Dairy Research Institute of Asturias (IPLA-CSIC), 33300 Villaviciosa, Spain; (L.F.); (P.G.)
- DairySafe Group, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Spain
| | - Pilar García
- Department of Technology and Biotechnology of Dairy Products, Dairy Research Institute of Asturias (IPLA-CSIC), 33300 Villaviciosa, Spain; (L.F.); (P.G.)
- DairySafe Group, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Spain
| | - Morten Kjos
- Faculty of Chemistry, Biotechnology and Food Science, The Norwegian University of Life Sciences, 1432 Ås, Norway; (C.K.); (D.M.A.); (M.T.M.)
| | - Dzung B. Diep
- Faculty of Chemistry, Biotechnology and Food Science, The Norwegian University of Life Sciences, 1432 Ås, Norway; (C.K.); (D.M.A.); (M.T.M.)
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13
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Penesyan A, Paulsen IT, Gillings MR, Kjelleberg S, Manefield MJ. Secondary Effects of Antibiotics on Microbial Biofilms. Front Microbiol 2020; 11:2109. [PMID: 32983070 PMCID: PMC7492572 DOI: 10.3389/fmicb.2020.02109] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 08/11/2020] [Indexed: 12/28/2022] Open
Abstract
Biofilms are assemblages of microorganisms attached to each other, or to a surface, and encased in a protective, self-produced matrix. Such associations are now recognized as the predominant microbial growth mode. The physiology of cells in biofilms differs from that of the planktonic cells on which most research has been conducted. Consequently, there are significant gaps in our knowledge of the biofilm lifestyle. Filling this gap is particularly important, given that biofilm cells may respond differently to antibiotics than do planktonic cells of the same species. Understanding the effects of antibiotics on biofilms is of paramount importance for clinical practice due to the increased levels of antibiotic resistance and resistance dissemination in biofilms. From a wider environmental perspective antibiotic exposure can alter the ecology of biofilms in nature, and hence disrupt ecosystems. Biofilm cells display increased resilience toward antibiotics. This resilience is often explained by mechanisms and traits such as decreased antibiotic penetration, metabolically inactive persister cells, and intrinsic resistance by members of the biofilm community. Together, these factors suggest that cells in biofilms are often exposed to subinhibitory concentrations of antimicrobial agents. Here we discuss how cells in biofilms are affected by the presence of antibiotics at subinhibitory concentrations, and the possible ramifications of such secondary effects for healthcare and the environment.
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Affiliation(s)
- Anahit Penesyan
- School of Chemical Engineering, University of New South Wales, Sydney, NSW, Australia
- Department of Molecular Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW, Australia
| | - Ian T. Paulsen
- Department of Molecular Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW, Australia
- ARC Centre of Excellence in Synthetic Biology, Macquarie University, Sydney, NSW, Australia
| | - Michael R. Gillings
- ARC Centre of Excellence in Synthetic Biology, Macquarie University, Sydney, NSW, Australia
- Department of Biological Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW, Australia
| | - Staffan Kjelleberg
- Singapore Centre for Environmental Life Sciences Engineering, Singapore, Singapore
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, Australia
| | - Michael J. Manefield
- School of Chemical Engineering, University of New South Wales, Sydney, NSW, Australia
- School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, Australia
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14
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Du H, Zhou L, Lu Z, Bie X, Zhao H, Niu YD, Lu F. Transcriptomic and proteomic profiling response of methicillin-resistant Staphylococcus aureus (MRSA) to a novel bacteriocin, plantaricin GZ1-27 and its inhibition of biofilm formation. Appl Microbiol Biotechnol 2020; 104:7957-7970. [PMID: 32803295 DOI: 10.1007/s00253-020-10589-w] [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] [Received: 11/21/2019] [Revised: 03/09/2020] [Accepted: 03/25/2020] [Indexed: 01/14/2023]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) has become a worrisome superbug, due to its wide distribution and multidrug resistance. To characterize effects of a newly identified plantaricin GZ1-27 on MRSA, transcriptomic and proteomic profiling of MRSA strain ATCC43300 was performed in response to sub-MIC (16 μg/mL) plantaricin GZ1-27 stress. In total, 1090 differentially expressed genes (padj < 0.05) and 418 differentially expressed proteins (fold change > 1.2, p < 0.05) were identified. Centralized protein expression clusters were predicted in biological functions (biofilm formation, DNA replication and repair, and heat-shock) and metabolic pathways (purine metabolism, amino acid metabolism, and biosynthesis of secondary metabolites). Moreover, a capacity of inhibition MRSA biofilm formation and killing biofilm cells were verified using crystal violet staining, scanning electron microscopy, and confocal laser-scanning microscopy. These findings yielded comprehensive new data regarding responses induced by plantaricin and could inform evidence-based methods to mitigate MRSA biofilm formation.
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Affiliation(s)
- Hechao Du
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Nanjing, 210095, China
| | - Libang Zhou
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Nanjing, 210095, China
| | - Zhaoxin Lu
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Nanjing, 210095, China
| | - Xiaomei Bie
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Nanjing, 210095, China
| | - Haizhen Zhao
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Nanjing, 210095, China
| | - Yan D Niu
- Faculty of Veterinary Medicine, University of Calgary, Calgary, T2N 4Z6, Canada
| | - Fengxia Lu
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Nanjing, 210095, China.
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15
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Nakada‐Motokawa N, Miyazaki T, Mizuta S, Tanaka Y, Hirayama T, Takazono T, Saijo T, Yamamoto K, Imamura Y, Izumikawa K, Yanagihara K, Makimura K, Takeda K, Kohno S, Mukae H. Design and Synthesis of a Class of Compounds That Inhibit the Growth of Fungi Which Cause Invasive Infections. ChemistrySelect 2020. [DOI: 10.1002/slct.201904380] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Nana Nakada‐Motokawa
- Department of Respiratory MedicineNagasaki University Hospital 1-7-1 Sakamoto Nagasaki Japan
- Department of Respiratory MedicineNagasaki University Graduate School of Biomedical Sciences 1-12-4 Sakamoto Nagasaki Japan
| | - Taiga Miyazaki
- Department of Respiratory MedicineNagasaki University Hospital 1-7-1 Sakamoto Nagasaki Japan
- Department of Infectious DiseasesNagasaki University Graduate School of Biomedical Sciences 1-12-4 Sakamoto Nagasaki Japan
| | - Satoshi Mizuta
- Center for Bioinformatics and Molecular MedicineNagasaki University Graduate School of Biomedical Sciences 1-12-4 Sakamoto Nagasaki Japan
| | - Yoshimasa Tanaka
- Center for Medical InnovationNagasaki University 1-7-1 Sakamoto Nagasaki Japan
| | - Tatsuro Hirayama
- Department of Respiratory MedicineNagasaki University Hospital 1-7-1 Sakamoto Nagasaki Japan
| | - Takahiro Takazono
- Department of Respiratory MedicineNagasaki University Hospital 1-7-1 Sakamoto Nagasaki Japan
- Department of Infectious DiseasesNagasaki University Graduate School of Biomedical Sciences 1-12-4 Sakamoto Nagasaki Japan
| | - Tomomi Saijo
- Department of Respiratory MedicineNagasaki University Hospital 1-7-1 Sakamoto Nagasaki Japan
| | - Kazuko Yamamoto
- Department of Respiratory MedicineNagasaki University Hospital 1-7-1 Sakamoto Nagasaki Japan
| | - Yoshifumi Imamura
- Department of Respiratory MedicineNagasaki University Hospital 1-7-1 Sakamoto Nagasaki Japan
| | - Koichi Izumikawa
- Department of Infectious DiseasesNagasaki University Graduate School of Biomedical Sciences 1-12-4 Sakamoto Nagasaki Japan
| | - Katsunori Yanagihara
- Department of Laboratory MedicineNagasaki University Hospital 1–7-1 Sakamoto Nagasaki Japan
| | - Koichi Makimura
- Department of Medical Mycology, Graduate School of MedicineTeikyo University 2–11-1 Kaga, Itabashi-ku Tokyo Japan
| | - Kohsuke Takeda
- Department of Cell RegulationNagasaki University Graduate School of Biomedical Sciences 1-14 Bunkyo-machi Nagasaki Japan
| | - Shigeru Kohno
- Department of Respiratory MedicineNagasaki University Hospital 1-7-1 Sakamoto Nagasaki Japan
| | - Hiroshi Mukae
- Department of Respiratory MedicineNagasaki University Hospital 1-7-1 Sakamoto Nagasaki Japan
- Department of Respiratory MedicineNagasaki University Graduate School of Biomedical Sciences 1-12-4 Sakamoto Nagasaki Japan
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16
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Yuan Z, Dai Y, Ouyang P, Rehman T, Hussain S, Zhang T, Yin Z, Fu H, Lin J, He C, Lv C, Liang X, Shu G, Song X, Li L, Zou Y, Yin L. Thymol Inhibits Biofilm Formation, Eliminates Pre-Existing Biofilms, and Enhances Clearance of Methicillin-Resistant Staphylococcus aureus (MRSA) in a Mouse Peritoneal Implant Infection Model. Microorganisms 2020; 8:microorganisms8010099. [PMID: 31936809 PMCID: PMC7023310 DOI: 10.3390/microorganisms8010099] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 01/08/2020] [Accepted: 01/09/2020] [Indexed: 12/19/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a common human pathogen that causes several difficult-to-treat infections, including biofilm-associated infections. The biofilm-forming ability of S. aureus plays a pivotal role in its resistance to most currently available antibiotics, including vancomycin, which is the first-choice drug for treating MRSA infections. In this study, the ability of thymol (a monoterpenoid phenol isolated from plants) to inhibit biofilm formation and to eliminate mature biofilms, was assessed. We found that thymol could inhibit biofilm formation and remove mature biofilms by inhibiting the production of polysaccharide intracellular adhesin (PIA) and the release of extracellular DNA (eDNA). However, cotreatment with thymol and vancomycin was more effective at eliminating MRSA biofilms, in a mouse infection model, than monotherapy with vancomycin. Comparative histopathological analyses revealed that thymol reduced the pathological changes and inflammatory responses in the wounds. Assessments of white blood cell counts and serum TNF-α and IL-6 levels showed reduced inflammation and an increased immune response following treatment with thymol and vancomycin. These results indicate that combinatorial treatment with thymol and vancomycin has the potential to serve as a more effective therapy for MRSA biofilm-associated infections than vancomycin monotherapy.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Lizi Yin
- Correspondence: ; Tel.: +86-170-9284-8186
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17
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During the Early Stages of Staphylococcus aureus Biofilm Formation, Induced Neutrophil Extracellular Traps Are Degraded by Autologous Thermonuclease. Infect Immun 2019; 87:IAI.00605-19. [PMID: 31527127 DOI: 10.1128/iai.00605-19] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 09/02/2019] [Indexed: 01/25/2023] Open
Abstract
Staphylococcus aureus extracellular DNA (eDNA) plays a crucial role in the structural stability of biofilms during bacterial colonization; on the contrary, host immune responses can be induced by bacterial eDNA. Previously, we observed production of S. aureus thermonuclease during the early stages of biofilm formation in a mammalian cell culture medium. Using a fluorescence resonance energy transfer (FRET)-based assay, we detected thermonuclease activity of S. aureus biofilms grown in Iscove's modified Dulbecco's medium (IMDM) earlier than that of widely studied biofilms grown in tryptic soy broth (TSB). The thermonuclease found was Nuc1, confirmed by mass spectrometry and competitive Luminex assay. These results indicate that biofilm development in IMDM may not rely on eDNA for structural stability. A bacterial viability assay in combination with wheat germ agglutinin (WGA) staining confirmed the accumulation of dead cells and eDNA in biofilms grown in TSB. However, in biofilms grown in IMDM, minimal amounts of eDNA were found; instead, polysaccharide intercellular adhesin (PIA) was detected. To investigate if this early production of thermonuclease plays a role in immune modulation by biofilm, we studied the effect of thermonuclease on human neutrophil extracellular trap (NET) formation using a nuc knockout and complemented strain. We confirmed that thermonuclease produced by early-stage biofilms grown in IMDM degraded biofilm-induced NETs. Additionally, neither the presence of biofilms nor thermonuclease stimulated an increase in reactive oxygen species (ROS) production by neutrophils. Our findings indicated that S. aureus, during the early stages of biofilm formation, actively evades the host immune responses by producing thermonuclease.
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18
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Biofilm Formation by Staphylococcus aureus Clinical Isolates is Differentially Affected by Glucose and Sodium Chloride Supplemented Culture Media. J Clin Med 2019; 8:jcm8111853. [PMID: 31684101 PMCID: PMC6912320 DOI: 10.3390/jcm8111853] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 10/25/2019] [Accepted: 10/29/2019] [Indexed: 12/17/2022] Open
Abstract
Staphylococcus aureus (S. aureus) causes persistent biofilm-related infections. Biofilm formation by S. aureus is affected by the culture conditions and is associated with certain genotypic characteristics. Here, we show that glucose and sodium chloride (NaCl) supplementation of culture media, a common practice in studies of biofilms in vitro, influences both biofilm formation by 40 S. aureus clinical isolates (methicillin-resistant and methicillin-sensitive S. aureus) and causes variations in biofilm quantification. Methicillin-resistant strains formed more robust biofilms than methicillin-sensitive strains in tryptic soy broth (TSB). However, glucose supplementation in TSB greatly promoted and stabilized biofilm formation of all strains, while additional NaCl was less efficient in this respect and resulted in significant variation in biofilm measurements. In addition, we observed that the ST239-SCCmec (Staphylococcal Cassette Chromosome mec) type III lineage formed strong biofilms in TSB supplemented with glucose and NaCl. Links between biofilm formation and accessory gene regulator (agr) status, as assessed by δ-toxin production, and with mannitol fermentation were not found. Our results show that TSB supplemented with 1.0% glucose supports robust biofilm production and reproducible quantification of S. aureus biofilm formation in vitro, whereas additional NaCl results in major variations in measurements of biofilm formation.
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19
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Roles of lytic transglycosylases in biofilm formation and β-lactam resistance in methicillin-resistant Staphylococcus aureus. Antimicrob Agents Chemother 2019:AAC.01277-19. [PMID: 31570396 DOI: 10.1128/aac.01277-19] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Staphylococcus aureus is responsible for numerous community outbreaks and is one of the most frequent causes of nosocomial infections with significant morbidity and mortality. While the function of lytic transglycosylases (LTs) in relation to cell division, biofilm formation, and antibiotic resistance has been determined for several bacteria, their role in S. aureus remains largely unknown. The only known LTs in S. aureus are immunodominant staphylococcal antigen A (IsaA) and Staphylococcus epidermidis D protein (SceD). Our study demonstrates that, in a strain of methicillin-resistant S. aureus (MRSA), IsaA and SceD contribute differently to biofilm formation and β-lactam resistance. Deletion of isaA, but not sceD, led to decreased biofilm formation. Additionally, in isaA-deleted strains, β-lactam resistance was significantly decreased compared to that of wild-type strains. Plasmid-based expression of mecA, a major determinant of β-lactam resistance in MRSA, in an isaA-deleted strain did not restore β-lactam resistance, demonstrating that the β-lactam susceptibility phenotype is exhibited by isaA mutant regardless of the production level of PBP2a. Overall, our results suggest that IsaA is a potential therapeutic target for MRSA infections.
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20
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Cotton Cellulose-CdTe Quantum Dots Composite Films with Inhibition of Biofilm-Forming S. aureus. FIBERS 2019. [DOI: 10.3390/fib7060057] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A cellulose-cadmium (Cd)-tellurium (TE) quantum dots (QDs) composite film was successfully synthesized by incorporating CdTe QDs onto a cellulose matrix derived from waste cotton linters. Cellulose-CdTe QDs composite film was characterized by field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The antibacterial activity of the prepared composite film was investigated using the multidrug-resistance (MTR) Staphylococcus aureus bacteria. In vitro antibacterial assays demonstrated that CdTe QDs composite film can efficiently inhibit biofilm formation. Our results showed that the cellulose-CdTe QDs composite film is a promising candidate for biomedical applications including wound dressing, medical instruments, burn treatments, implants, and other biotechnology fields.
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21
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Preliminary study on the effect of brazilin on biofilms of Staphylococcus aureus. Exp Ther Med 2018; 16:2108-2118. [PMID: 30186447 PMCID: PMC6122259 DOI: 10.3892/etm.2018.6403] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 06/01/2018] [Indexed: 12/13/2022] Open
Abstract
Biofilms significantly enhance antibiotic resistance by inhibiting penetration of antibiotics and are shielded from the immune system via the formation of an extracellular polymeric matrix. Innovative and novel approaches are required for the inhibition of biofilm formation and treatment of biofilm-associated infectious diseases. In the current study, a biofilm model of Staphylococcus aureus was established in vitro to explore inhibitory effects of brazilin (BN) on biofilm formation and to evaluate damaging effects of BN in the presence and absence of vancomycin (VCM) on the biofilm. Antibiofilm-infection mechanisms of BN were observed. In these experiments, the clinical strain of S. aureus C-4-4 was isolated for biofilm formation. Crystal violet staining and fluorescence microscopy revealed that BN inhibited biofilm formation in vitro and the best effect was observed with two times the minimum inhibitory concentration of BN following 48 h incubation. Additionally, the results demonstrated that BN in combination with VCM enhanced the damage to biofilms, whereas VCM alone did not. The results of the reverse transcription-quantitative polymerase chain reaction analyses demonstrated that BN downregulated gene expression of intercellular adhesion (ica)A and upregulated icaR and the quorum-sensing (QS) system regulator accessory gene regulator A. In summary, BN inhibited S. aureus biofilm formation and destroyed biofilms, while simultaneously increasing permeability to VCM. BN was able to reduce production of the extracellular polymeric matrix and inhibited the QS system. These results support the use of BN as a novel drug and treatment strategy for S. aureus biofilm-associated infections.
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22
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Okuda KI, Nagahori R, Yamada S, Sugimoto S, Sato C, Sato M, Iwase T, Hashimoto K, Mizunoe Y. The Composition and Structure of Biofilms Developed by Propionibacterium acnes Isolated from Cardiac Pacemaker Devices. Front Microbiol 2018; 9:182. [PMID: 29491850 PMCID: PMC5817082 DOI: 10.3389/fmicb.2018.00182] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 01/26/2018] [Indexed: 11/13/2022] Open
Abstract
The present study aimed to understand the biofilm formation mechanism of Propionibacterium acnes by analyzing the components and structure of the biofilms. P. acnes strains were isolated from the surface of explanted cardiac pacemaker devices that exhibited no clinical signs of infection. Culture tests using a simple stamp culture method (pressing pacemakers against the surface of agar plates) revealed frequent P. acnes colonization on the surface of cardiac pacemaker devices. P. acnes was isolated from 7/31 devices, and the isolates were categorized by multilocus sequence typing into five different sequence types (STs): ST4 (JK18.2), ST53 (JK17.1), ST69 (JK12.2 and JK13.1), ST124 (JK5.3), ST125 (JK6.2), and unknown ST (JK19.3). An in vitro biofilm formation assay using microtiter plates demonstrated that 5/7 isolates formed biofilms. Inhibitory effects of DNase I and proteinase K on biofilm formation varied among isolates. In contrast, dispersin B showed no inhibitory activity against all isolates. Three-dimensional live/dead imaging of P. acnes biofilms with different biochemical properties using confocal laser microscopy demonstrated different distributions and proportions of living and dead cells. Additionally, it was suggested that extracellular DNA (eDNA) plays a role in the formation of biofilms containing living cells. Ultrastructural analysis of P. acnes biofilms using a transmission electron microscope and atmospheric scanning electron microscope revealed leakage of cytoplasmic components along with cell lysis and fibrous structures of eDNA connecting cells. In conclusion, the biochemical properties and structures of the biofilms differed among P. acnes isolates. These findings may provide clues for establishing countermeasures against biofilm-associated infection by P. acnes.
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Affiliation(s)
- Ken-Ichi Okuda
- Department of Bacteriology, The Jikei University School of Medicine, Tokyo, Japan.,Jikei Center for Biofilm Science and Technology, Tokyo, Japan
| | - Ryuichi Nagahori
- Department of Cardiac Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Satomi Yamada
- Department of Bacteriology, The Jikei University School of Medicine, Tokyo, Japan
| | - Shinya Sugimoto
- Department of Bacteriology, The Jikei University School of Medicine, Tokyo, Japan.,Jikei Center for Biofilm Science and Technology, Tokyo, Japan
| | - Chikara Sato
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | - Mari Sato
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | - Tadayuki Iwase
- Department of Bacteriology, The Jikei University School of Medicine, Tokyo, Japan.,Jikei Center for Biofilm Science and Technology, Tokyo, Japan
| | - Kazuhiro Hashimoto
- Department of Cardiac Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Yoshimitsu Mizunoe
- Department of Bacteriology, The Jikei University School of Medicine, Tokyo, Japan.,Jikei Center for Biofilm Science and Technology, Tokyo, Japan
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