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Zhang Y, Wu Q, Forsythe S, Liu C, Chen N, Li Y, Zhang J, Wang J, Ding Y. The cascade regulation of small RNA and quorum sensing system: Focusing on biofilm formation of foodborne pathogens in food industry. FOOD BIOSCI 2023. [DOI: 10.1016/j.fbio.2023.102472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Plazonic F, LuTheryn G, Hind C, Clifford M, Gray M, Stride E, Glynne-Jones P, Hill M, Sutton JM, Carugo D. Bactericidal Effect of Ultrasound-Responsive Microbubbles and Sub-inhibitory Gentamicin against Pseudomonas aeruginosa Biofilms on Substrates With Differing Acoustic Impedance. ULTRASOUND IN MEDICINE & BIOLOGY 2022; 48:1888-1898. [PMID: 35798625 DOI: 10.1016/j.ultrasmedbio.2022.05.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 05/10/2022] [Accepted: 05/13/2022] [Indexed: 06/15/2023]
Abstract
The aim of this research was to explore the interaction between ultrasound-activated microbubbles (MBs) and Pseudomonas aeruginosa biofilms, specifically the effects of MB concentration, ultrasound exposure and substrate properties on bactericidal efficacy. Biofilms were grown using a Centre for Disease Control (CDC) bioreactor on polypropylene or stainless-steel coupons as acoustic analogues for soft and hard tissue, respectively. Biofilms were treated with different concentrations of phospholipid-shelled MBs (107-108 MB/mL), a sub-inhibitory concentration of gentamicin (4 µg/mL) and 1-MHz ultrasound with a continuous or pulsed (100-kHz pulse repetition frequency, 25% duty cycle, 0.5-MPa peak-to-peak pressure) wave. The effect of repeated ultrasound exposure with intervals of either 15- or 60-min was also investigated. With polypropylene coupons, the greatest bactericidal effect was achieved with 2 × 5 min of pulsed ultrasound separated by 60 min and a microbubble concentration of 5 × 107 MBs/mL. A 0.76 log (83%) additional reduction in the number of bacteria was achieved compared with the use of an antibiotic alone. With stainless-steel coupons, a 67% (0.46 log) reduction was obtained under the same exposure conditions, possibly due to enhancement of a standing wave field which inhibited MB penetration in the biofilm. These findings demonstrate the importance of treatment parameter selection in antimicrobial applications of MBs and ultrasound in different tissue environments.
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Affiliation(s)
- Filip Plazonic
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - Gareth LuTheryn
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK; Department of Pharmaceutics, School of Pharmacy, University College London, London, UK; National Biofilms Innovation Centre, University of Southampton, Southampton, UK
| | - Charlotte Hind
- UK Health Security Agency, Porton Down, Salisbury, Wiltshire, UK
| | - Melanie Clifford
- UK Health Security Agency, Porton Down, Salisbury, Wiltshire, UK
| | - Michael Gray
- Institute of Biomedical Engineering, University of Oxford, Oxford, UK
| | - Eleanor Stride
- Institute of Biomedical Engineering, University of Oxford, Oxford, UK
| | - Peter Glynne-Jones
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - Martyn Hill
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - J Mark Sutton
- UK Health Security Agency, Porton Down, Salisbury, Wiltshire, UK; Institute of Pharmaceutical Science, King's College London, London, UK
| | - Dario Carugo
- Department of Pharmaceutics, School of Pharmacy, University College London, London, UK.
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