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Belfield K, Bayston R, Hajduk N, Levell G, Birchall JP, Daniel M. Evaluation of combinations of putative anti-biofilm agents and antibiotics to eradicate biofilms of Staphylococcus aureus and Pseudomonas aeruginosa. J Antimicrob Chemother 2018; 72:2531-2538. [PMID: 28859444 DOI: 10.1093/jac/dkx192] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 05/23/2017] [Indexed: 12/31/2022] Open
Abstract
Objectives To evaluate potential anti-biofilm agents for their ability to enhance the activity of antibiotics for local treatment of localized biofilm infections. Methods Staphylococcus aureus and Pseudomonas aeruginosa in vitro biofilm models were developed. The putative antibiotic enhancers N-acetylcysteine, acetylsalicylic acid, sodium salicylate, recombinant human deoxyribonuclease I, dispersin B, hydrogen peroxide and Johnson's Baby Shampoo (JBS) were tested for their anti-biofilm activity alone and their ability to enhance the activity of antibiotics for 7 or 14 days, against 5 day old biofilms. The antibiotic enhancers were paired with rifampicin and clindamycin against S. aureus and gentamicin and ciprofloxacin against P. aeruginosa. Isolates from biofilms that were not eradicated were tested for antibiotic resistance. Results Antibiotic levels 10× MIC and 100× MIC significantly reduced biofilm, but did not consistently eradicate it. Antibiotics at 100× MIC with 10% JBS for 14 days was the only treatment to eradicate both staphylococcal and pseudomonal biofilms. Recombinant human deoxyribonuclease I significantly reduced staphylococcal biofilm. Emergence of resistance of surviving isolates was minimal and was often associated with the small colony variant phenotype. Conclusions JBS enhanced the activity of antibiotics and several other promising anti-biofilm agents were identified. Antibiotics with 10% JBS eradicated biofilms produced by both organisms. Such combinations might be useful in local treatment of localized biofilm infections.
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Affiliation(s)
- Katherine Belfield
- Biomaterials-Related Infection Group, Department of Orthopaedics, Trauma and Sports Medicine, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - Roger Bayston
- Biomaterials-Related Infection Group, Department of Orthopaedics, Trauma and Sports Medicine, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - Nadzieja Hajduk
- Biomaterials-Related Infection Group, Department of Orthopaedics, Trauma and Sports Medicine, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - Georgia Levell
- Biomaterials-Related Infection Group, Department of Orthopaedics, Trauma and Sports Medicine, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - John P Birchall
- NIHR Nottingham Hearing Biomedical Research Unit, Nottingham University Hospitals, Ropewalk House, Nottingham, UK.,Otology and Hearing Group, Division of Clinical Neuroscience, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK.,Otorhinolaryngology, Nottingham University Hospitals, Queen's Medical Centre, Nottingham, UK
| | - Matija Daniel
- NIHR Nottingham Hearing Biomedical Research Unit, Nottingham University Hospitals, Ropewalk House, Nottingham, UK.,Otology and Hearing Group, Division of Clinical Neuroscience, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK.,Otorhinolaryngology, Nottingham University Hospitals, Queen's Medical Centre, Nottingham, UK
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