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Lin F, Yuan S, Ji P, Xu W. Regulation of Bacterial Biofilm Formation by Ultrasound: Role of Autoinducer-2 and Finite-Element Analysis of Acoustic Streaming. ULTRASOUND IN MEDICINE & BIOLOGY 2023:S0301-5629(23)00210-7. [PMID: 37438162 DOI: 10.1016/j.ultrasmedbio.2023.06.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 05/18/2023] [Accepted: 06/25/2023] [Indexed: 07/14/2023]
Abstract
OBJECTIVE The formation of bacterial biofilm regulated by quorum sensing (QS) is a critical factor that contributes to infections of indwelling medical devices. Autoinducer-2 (AI-2), as a signal molecule in QS, plays a crucial role in mediating bacterial signaling and regulating their biological behavior. This study investigated the impact of ultrasonic vibration at varying frequencies on biofilm formation in a mixture of Staphylococcus aureus and Escherichia coli. METHODS By exciting ultrasound at different frequencies (20, 100 and 200 kHz), a vibration with an amplitude of 100 nm was generated on the material surface located at the bottom of the petri dish containing mixed bacteria. We measured the content of AI-2 and bacteria in the mixed bacterial solution and bioburden on material surfaces at different time points during culture. In addition, the relationships among AI-2 content, bacterial concentration and distribution were assessed through finite-element analysis of acoustic streaming under ultrasonic vibration. RESULTS The AI-2 gradient is influenced by the diversity of acoustic streaming patterns on the material surface and in the mixed bacterial solution caused by ultrasonic vibration at different frequencies, thereby regulating biofilm formation. The experimental results showed that the optimal inhibition effect on AI-2 and minimal bacterial adhesion degree was achieved when applying an ultrasonic frequency of 100 kHz with a power intensity of 46.1 mW/cm2 under an amplitude of 100 nm. CONCLUSION Ultrasound can affect the QS system of bacteria, leading to alterations in their biological behavior. Different species of bacteria exhibit varying degrees of chemotaxis toward different frequencies.
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Affiliation(s)
- Fangfei Lin
- School of Mechanical Engineering and Automation, Beihang University, Beijing, China; Ningbo Institute of Technology, Beihang University, Ningbo, China
| | - Songmei Yuan
- School of Mechanical Engineering and Automation, Beihang University, Beijing, China; Ningbo Institute of Technology, Beihang University, Ningbo, China.
| | - Pengzhen Ji
- School of Mechanical Engineering and Automation, Beihang University, Beijing, China; Ningbo Institute of Technology, Beihang University, Ningbo, China
| | - Weixian Xu
- Department of Cardiology, Peking University Third Hospital, Beijing, China
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Dermatophytic Biofilms: Characteristics, Significance and Treatment Approaches. J Fungi (Basel) 2023; 9:jof9020228. [PMID: 36836342 PMCID: PMC9960790 DOI: 10.3390/jof9020228] [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: 11/30/2022] [Revised: 12/29/2022] [Accepted: 02/06/2023] [Indexed: 02/11/2023] Open
Abstract
Microbes are found in the environment, possibly more often as biofilms than in planktonic forms. Biofilm formation has been described for several important fungal species. The presence of a dermatophytoma in a dermatophytic nail infection was the basis for the proposal that dermatophytes form biofilms as well. This could explain treatment failure and recurrent dermatophytic infections. Several investigators have performed in vitro and ex vivo experiments to study the formation of biofilms by dermatophytes and their properties. The nature of the biofilm structure itself contributes to fungal protection mechanisms against many harmful external agents, including antifungals. Thus, a different approach should be carried out regarding susceptibility testing and treatment. Concerning susceptibility testing, methods to evaluate either the inhibition of biofilm formation, or the ability to eradicate it, have been introduced. As for treatment, in addition to classical antifungal agents, some natural formulations, such as plant extracts or biosurfactants, and alternative approaches, such as photodynamic therapy, have been proposed. Studies that connect the results of the in vitro and ex vivo experimentation with clinical outcomes are required in order to verify the efficacy of these approaches in clinical practice.
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3
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Ramakrishnan R, Singh AK, Singh S, Chakravortty D, Das D. Enzymatic Dispersion of Biofilms: An Emerging Biocatalytic Avenue to Combat Biofilm-Mediated Microbial Infections. J Biol Chem 2022; 298:102352. [PMID: 35940306 PMCID: PMC9478923 DOI: 10.1016/j.jbc.2022.102352] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 08/02/2022] [Accepted: 08/03/2022] [Indexed: 01/01/2023] Open
Abstract
Drug resistance by pathogenic microbes has emerged as a matter of great concern to mankind. Microorganisms such as bacteria and fungi employ multiple defense mechanisms against drugs and the host immune system. A major line of microbial defense is the biofilm, which comprises extracellular polymeric substances that are produced by the population of microorganisms. Around 80% of chronic bacterial infections are associated with biofilms. The presence of biofilms can increase the necessity of doses of certain antibiotics up to 1000-fold to combat infection. Thus, there is an urgent need for strategies to eradicate biofilms. Although a few physicochemical methods have been developed to prevent and treat biofilms, these methods have poor efficacy and biocompatibility. In this review, we discuss the existing strategies to combat biofilms and their challenges. Subsequently, we spotlight the potential of enzymes, in particular, polysaccharide degrading enzymes, for biofilm dispersion, which might lead to facile antimicrobial treatment of biofilm-associated infections.
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Affiliation(s)
- Reshma Ramakrishnan
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, Karnataka, India
| | - Ashish Kumar Singh
- Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore, Karnataka, India
| | - Simran Singh
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, Karnataka, India
| | - Dipshikha Chakravortty
- Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore, Karnataka, India
| | - Debasis Das
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, Karnataka, India.
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Guex AG, Di Marzio N, Eglin D, Alini M, Serra T. The waves that make the pattern: a review on acoustic manipulation in biomedical research. Mater Today Bio 2021; 10:100110. [PMID: 33997761 PMCID: PMC8094912 DOI: 10.1016/j.mtbio.2021.100110] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 02/19/2021] [Accepted: 03/13/2021] [Indexed: 02/06/2023] Open
Abstract
Novel approaches, combining technology, biomaterial design, and cutting-edge cell culture, have been increasingly considered to advance the field of tissue engineering and regenerative medicine. Within this context, acoustic manipulation to remotely control spatial cellular organization within a carrier matrix has arisen as a particularly promising method during the last decade. Acoustic or sound-induced manipulation takes advantage of hydrodynamic forces exerted on systems of particles within a liquid medium by standing waves. Inorganic or organic particles, cells, or organoids assemble within the nodes of the standing wave, creating distinct patterns in response to the applied frequency and amplitude. Acoustic manipulation has advanced from micro- or nanoparticle arrangement in 2D to the assembly of multiple cell types or organoids into highly complex in vitro tissues. In this review, we discuss the past research achievements in the field of acoustic manipulation with particular emphasis on biomedical application. We survey microfluidic, open chamber, and high throughput devices for their applicability to arrange non-living and living units in buffer or hydrogels. We also investigate the challenges arising from different methods, and their prospects to gain a deeper understanding of in vitro tissue formation and application in the field of biomedical engineering. Work on sound waves to spatially control particulate systems is reviewed. Classification of surface acoustic waves, bulk acoustic waves, and Faraday waves. Sound can be used to arrange, separate, or filter polymer particles. Sound can pattern cells in 3D to induce morphogenesis. Long-term applied sound induces differentiation and tissue formation.
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Affiliation(s)
- A G Guex
- AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland
| | - N Di Marzio
- AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland.,Department of Health Sciences, Università del Piemonte Orientale (UPO), Novara, Italy
| | - D Eglin
- AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland
| | - M Alini
- AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland
| | - T Serra
- AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland
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Nica DF, Riviș M, Roi CI, Todea CD, Duma VF, Sinescu C. Complementarity of Photo-Biomodulation, Surgical Treatment, and Antibiotherapy for Medication-Related Osteonecrosis of the Jaws (MRONJ). ACTA ACUST UNITED AC 2021; 57:medicina57020145. [PMID: 33562600 PMCID: PMC7914693 DOI: 10.3390/medicina57020145] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 01/30/2021] [Accepted: 02/02/2021] [Indexed: 01/16/2023]
Abstract
Background and Objectives: Antiresorptive or anti-angiogenic agents may induce medication-related osteonecrosis of the jaws (MRONJ), which represents a challenge for clinicians. The aim of this study is to design and apply a composed and stage-approach therapy combining antibiotherapy, surgical treatment, and photo-biomodulation (PBM) for the prevention or treatment of MRONJ lesions. Materials and Methods: The proposed treatment protocol was carried out in the Department of Oral & Maxillofacial Surgery of the “Victor Babes” University of Medicine and Farmacy of Timisoara, in 2018–2020. A total of 241 patients who were previously exposed to antiresorptive or anti-angiogenic therapy, as well as patients already diagnosed with MRONJ at different stages of the disease were treated. A preventive protocol was applied for patients in an “at risk” stage. Patients in more advanced stages received a complex treatment. Results: The healing proved to be complete, with spontaneous bone coverage in all the n = 84 cases placed in an “at risk” stage. For the n = 49 patients belonging to stage 0, pain reductions and decreases of mucosal inflammations were also obtained in all cases. For the n = 108 patients proposed for surgery (i.e., in stages 1, 2, or 3 of MRONJ), a total healing rate of 91.66% was obtained after the first surgery, while considering the downscaling to stage 1 as a treatment “success”, only one “failure” was reported. This brings the overall “success” rate to 96.68% for a complete healing, and to 99.59% when downscaling to stage 1 is included in the healing rate. Conclusions: Therefore, the clinical outcome of the present study indicates that patients with MRONJ in almost all stages of the disease can benefit from such a proposed association of methods, with superior clinical results compared to classical therapies.
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Affiliation(s)
- Diana Florina Nica
- Department of Anaesthesiology and Oral Surgery, School of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy of Timisoara, 2A Eftimie Murgu Place, 300041 Timisoara, Romania; (D.F.N.); (C.I.R.)
| | - Mircea Riviș
- Department of Anaesthesiology and Oral Surgery, School of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy of Timisoara, 2A Eftimie Murgu Place, 300041 Timisoara, Romania; (D.F.N.); (C.I.R.)
- Correspondence: (M.R.); (V.-F.D.); Tel.: +40-751-511451 (V.-F.D.)
| | - Ciprian Ioan Roi
- Department of Anaesthesiology and Oral Surgery, School of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy of Timisoara, 2A Eftimie Murgu Place, 300041 Timisoara, Romania; (D.F.N.); (C.I.R.)
| | - Carmen Darinca Todea
- Department of Oral Rehabilitation and Dental Emergencies, School of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy of Timisoara, 2A Eftimie Murgu Place, 300041 Timisoara, Romania;
| | - Virgil-Florin Duma
- 3OM Optomechatronics Group, Faculty of Engineering, “Aurel Vlaicu” University of Arad, 2 Elena Dragoi Str., 310177 Arad, Romania
- Doctoral School, Polytechnic University of Timisoara, 1 Mihai Viteazu Ave., 300222 Timisoara, Romania
- Research Center in Dental Medicine Using Conventional and Alternative Technologies, School of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy of Timisoara, 9 Revolutiei 1989 Ave., 300070 Timisoara, Romania;
- Correspondence: (M.R.); (V.-F.D.); Tel.: +40-751-511451 (V.-F.D.)
| | - Cosmin Sinescu
- Research Center in Dental Medicine Using Conventional and Alternative Technologies, School of Dental Medicine, “Victor Babes” University of Medicine and Pharmacy of Timisoara, 9 Revolutiei 1989 Ave., 300070 Timisoara, Romania;
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Lin F, Yuan S, Han W. Effective prevention of Escherichia coli biofilm on materials by nano-vibration. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125610] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Piezoelectric-Assisted Removal of a Mandibular Cementoossifying Fibroma: An Innovative Technique. Case Rep Dent 2020; 2020:8821090. [PMID: 33005458 PMCID: PMC7503107 DOI: 10.1155/2020/8821090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 07/09/2020] [Accepted: 07/13/2020] [Indexed: 11/24/2022] Open
Abstract
Diagnosis of cementoossifying fibroma is oriented by the clinical and radiological aspects of the lesion. Histology confirms the diagnosis. Treatment is surgical with enucleation-resection depending on the lesion size or wider resection with bone reconstruction in cases of large fibromas. The use of piezoelectric bone surgery is associated with low surgical trauma, exceptional precision, and fast healing response. It also allows easy performance of complex osteotomy and reduces the necessary dimensions of mucoperiosteal dissection. The purpose of the present article was to present the advantages of piezoelectric-assisted surgical removal of a cementoosseous fibroma of the mandible and to provide a precise description of the procedure using atraumatic surgery.
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Mathieu L, Keraval A, Declercq NF, Block JC. Assessment of a low-frequency ultrasound device on prevention of biofilm formation and carbonate deposition in drinking water systems. ULTRASONICS SONOCHEMISTRY 2019; 52:41-49. [PMID: 30718177 DOI: 10.1016/j.ultsonch.2018.10.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 10/04/2018] [Accepted: 10/21/2018] [Indexed: 06/09/2023]
Abstract
A device generating low-frequency and low-intensity ultrasound waves was used for mitigating biofilm accumulation and scaling. Two systems were tested: a lab-scale plate heat exchanger operated with continuously recycled water and a continually fed flow-through drinking water pilot used for mimicking water circulation in pipes. Initial deposition of bacterial cells was not prevented by ultrasound wave treatment. However, whatever the tested system, both further calcium carbonate deposition and biofilm growth were markedly inhibited. Biofilms formed in reactors subjected to low-frequency and low-intensity ultrasound waves were weakly attached to the material. Even though the activity of bacteria was affected as shown by their lower cultivability, membrane permeability did not appear compromised. Ultrasound technology sounds very promising in both the mitigation of drinking water biofilm and carbonate accumulation.
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Affiliation(s)
- Laurence Mathieu
- EPHE, PSL Research University, UMR 7564, LCPME, F-54500 Vandoeuvre-lès-Nancy, France.
| | - Anaïs Keraval
- Lorraine University, CNRS, UMR 7564, LCPME, F-54600 Villers-lès-Nancy, France
| | - Nico F Declercq
- Georgia Institute of Technology, UMI Georgia Tech - CNRS 2958, F-57070 Metz, France
| | - Jean-Claude Block
- Lorraine University, CNRS, UMR 7564, LCPME, F-54600 Villers-lès-Nancy, France
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9
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Hou Y, Yang M, Jiang H, Li D, Du Y. Effects of low-intensity and low-frequency ultrasound combined with tobramycin on biofilms of extended-spectrum beta-lactamases (ESBLs) Escherichia coli. FEMS Microbiol Lett 2019; 366:5304977. [DOI: 10.1093/femsle/fnz026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 01/30/2019] [Indexed: 11/13/2022] Open
Affiliation(s)
- Yuru Hou
- State Key Laboratory of Ultrasound Engineering in Medicine Co-Founded by Chongqing and the Ministry of Science and Technology, Chongqing Collaborative Innovation Center for Minimally Invasive and Noninvasive Medicine, College of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China
| | - Min Yang
- State Key Laboratory of Ultrasound Engineering in Medicine Co-Founded by Chongqing and the Ministry of Science and Technology, Chongqing Collaborative Innovation Center for Minimally Invasive and Noninvasive Medicine, College of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China
| | - Hexun Jiang
- State Key Laboratory of Ultrasound Engineering in Medicine Co-Founded by Chongqing and the Ministry of Science and Technology, Chongqing Collaborative Innovation Center for Minimally Invasive and Noninvasive Medicine, College of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China
- Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai 200040, China
| | - Dairong Li
- Department of Respiratory Disease, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Yonghong Du
- State Key Laboratory of Ultrasound Engineering in Medicine Co-Founded by Chongqing and the Ministry of Science and Technology, Chongqing Collaborative Innovation Center for Minimally Invasive and Noninvasive Medicine, College of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China
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Khatoon Z, McTiernan CD, Suuronen EJ, Mah TF, Alarcon EI. Bacterial biofilm formation on implantable devices and approaches to its treatment and prevention. Heliyon 2018; 4:e01067. [PMID: 30619958 PMCID: PMC6312881 DOI: 10.1016/j.heliyon.2018.e01067] [Citation(s) in RCA: 555] [Impact Index Per Article: 92.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 12/17/2018] [Accepted: 12/17/2018] [Indexed: 02/06/2023] Open
Abstract
In living organisms, biofilms are defined as complex communities of bacteria residing within an exopolysaccharide matrix that adheres to a surface. In the clinic, they are typically the cause of chronic, nosocomial, and medical device-related infections. Due to the antibiotic-resistant nature of biofilms, the use of antibiotics alone is ineffective for treating biofilm-related infections. In this review, we present a brief overview of concepts of bacterial biofilm formation, and current state-of-the-art therapeutic approaches for preventing and treating biofilms. Also, we have reviewed the prevalence of such infections on medical devices and discussed the future challenges that need to be overcome in order to successfully treat biofilms using the novel technologies being developed.
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Affiliation(s)
- Zohra Khatoon
- Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, Ontario, K1Y 4W7, Canada
| | - Christopher D. McTiernan
- Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, Ontario, K1Y 4W7, Canada
| | - Erik J. Suuronen
- Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, Ontario, K1Y 4W7, Canada
| | - Thien-Fah Mah
- Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Ontario, Canada
| | - Emilio I. Alarcon
- Division of Cardiac Surgery, University of Ottawa Heart Institute, Ottawa, Ontario, K1Y 4W7, Canada
- Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Ontario, Canada
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Teirlinck E, Xiong R, Brans T, Forier K, Fraire J, Van Acker H, Matthijs N, De Rycke R, De Smedt SC, Coenye T, Braeckmans K. Laser-induced vapour nanobubbles improve drug diffusion and efficiency in bacterial biofilms. Nat Commun 2018; 9:4518. [PMID: 30375378 PMCID: PMC6207769 DOI: 10.1038/s41467-018-06884-w] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 10/02/2018] [Indexed: 02/07/2023] Open
Abstract
Hindered penetration of antibiotics through biofilms is one of the reasons for the alarming increase in bacterial tolerance to antibiotics. Here, we investigate the potential of laser-induced vapour nanobubbles (VNBs) formed around plasmonic nanoparticles to locally disturb biofilm integrity and improve antibiotics diffusion. Our results show that biofilms of both Gram-negative (Burkholderia multivorans, Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus) bacteria can be loaded with cationic 70-nm gold nanoparticles and that subsequent laser illumination results in VNB formation inside the biofilms. In all types of biofilms tested, VNB formation leads to substantial local biofilm disruption, increasing tobramycin efficacy up to 1-3 orders of magnitude depending on the organism and treatment conditions. Altogether, our results support the potential of laser-induced VNBs as a new approach to disrupt biofilms of a broad range of organisms, resulting in improved antibiotic diffusion and more effective biofilm eradication.
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Affiliation(s)
- Eline Teirlinck
- Laboratory of General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, 9000, Belgium
- Centre for Nano- and Biophotonics, Ghent, 9000, Belgium
| | - Ranhua Xiong
- Laboratory of General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, 9000, Belgium
- Centre for Nano- and Biophotonics, Ghent, 9000, Belgium
| | - Toon Brans
- Laboratory of General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, 9000, Belgium
- Centre for Nano- and Biophotonics, Ghent, 9000, Belgium
| | - Katrien Forier
- Laboratory of General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, 9000, Belgium
- Centre for Nano- and Biophotonics, Ghent, 9000, Belgium
- Laboratory of Toxicology, Ghent University Hospital, Ghent, 9000, Belgium
| | - Juan Fraire
- Laboratory of General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, 9000, Belgium
- Centre for Nano- and Biophotonics, Ghent, 9000, Belgium
| | - Heleen Van Acker
- Laboratory of Pharmaceutical Microbiology, University of Ghent, Ghent, 9000, Belgium
| | - Nele Matthijs
- Laboratory of Pharmaceutical Microbiology, University of Ghent, Ghent, 9000, Belgium
| | - Riet De Rycke
- Department of Biomedical Molecular Biology, VIB Center for Inflammation Research, Ghent University, 9052, Ghent, Belgium
- Expertise Centre for Transmission Electron Microscopy, VIB BioImaging Core, Ghent University, Ghent, 9052, Belgium
| | - Stefaan C De Smedt
- Laboratory of General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, 9000, Belgium
- Centre for Nano- and Biophotonics, Ghent, 9000, Belgium
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology, University of Ghent, Ghent, 9000, Belgium
| | - Kevin Braeckmans
- Laboratory of General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, 9000, Belgium.
- Centre for Nano- and Biophotonics, Ghent, 9000, Belgium.
- IEMN UMR 8520, Université de Lille, Villeneuve d'Ascq, 59652, France.
- Laboratoire de Physique des Lasers, Atomes et Molécules UMR 8523, Villeneuve d'Ascq, 59655, France.
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Pericolini E, Colombari B, Ferretti G, Iseppi R, Ardizzoni A, Girardis M, Sala A, Peppoloni S, Blasi E. Real-time monitoring of Pseudomonas aeruginosa biofilm formation on endotracheal tubes in vitro. BMC Microbiol 2018; 18:84. [PMID: 30107778 PMCID: PMC6092828 DOI: 10.1186/s12866-018-1224-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 07/30/2018] [Indexed: 11/24/2022] Open
Abstract
Background Pseudomonas aeruginosa is an opportunistic bacterial pathogen responsible for both acute and chronic infections in humans. In particular, its ability to form biofilm, on biotic and abiotic surfaces, makes it particularly resistant to host’s immune defenses and current antibiotic therapies as well. Innovative antimicrobial materials, like hydrogel, silver salts or nanoparticles have been used to cover new generation catheters with promising results. Nevertheless, biofilm remains a major health problem. For instance, biofilm produced onto endotracheal tubes (ETT) of ventilated patients plays a relevant role in the onset of ventilation-associated pneumonia. Most of our knowledge on Pseudomonas aeruginosa biofilm derives from in vitro studies carried out on abiotic surfaces, such as polystyrene microplates or plastic materials used for ETT manufacturing. However, these approaches often provide underestimated results since other parameters, in addition to bacterial features (i.e. shape and material composition of ETT) might strongly influence biofilm formation. Results We used an already established biofilm development assay on medically-relevant foreign devices (CVC catheters) by a stably transformed bioluminescent (BLI)-Pseudomonas aeruginosa strain, in order to follow up biofilm formation on ETT by bioluminescence detection. Our results demonstrated that it is possible: i) to monitor BLI-Pseudomonas aeruginosa biofilm development on ETT pieces in real-time, ii) to evaluate the three-dimensional structure of biofilm directly on ETT, iii) to assess metabolic behavior and the production of microbial virulence traits of bacteria embedded on ETT-biofilm. Conclusions Overall, we were able to standardize a rapid and easy-to-perform in vitro model for real-time monitoring Pseudomonas aeruginosa biofilm formation directly onto ETT pieces, taking into account not only microbial factors, but also ETT shape and material. Our study provides a rapid method for future screening and validation of novel antimicrobial drugs as well as for the evaluation of novel biomaterials employed in the production of new classes of ETT. Electronic supplementary material The online version of this article (10.1186/s12866-018-1224-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Eva Pericolini
- Department of Surgical, Medical, Dental and Morphological Sciences with interest in Transplant, Oncological and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy.
| | - Bruna Colombari
- Department of Surgical, Medical, Dental and Morphological Sciences with interest in Transplant, Oncological and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Gianmarco Ferretti
- Department of Surgical, Medical, Dental and Morphological Sciences with interest in Transplant, Oncological and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Ramona Iseppi
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Andrea Ardizzoni
- Department of Surgical, Medical, Dental and Morphological Sciences with interest in Transplant, Oncological and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Massimo Girardis
- Department of Surgical, Medical, Dental and Morphological Sciences with interest in Transplant, Oncological and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Arianna Sala
- Department of Surgical, Medical, Dental and Morphological Sciences with interest in Transplant, Oncological and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Samuele Peppoloni
- Department of Surgical, Medical, Dental and Morphological Sciences with interest in Transplant, Oncological and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Elisabetta Blasi
- Department of Surgical, Medical, Dental and Morphological Sciences with interest in Transplant, Oncological and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
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Dong Y, Li J, Li P, Yu J. Ultrasound Microbubbles Enhance the Activity of Vancomycin Against Staphylococcus epidermidis Biofilms In Vivo. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2018; 37:1379-1387. [PMID: 29159979 DOI: 10.1002/jum.14475] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 08/17/2017] [Accepted: 08/28/2017] [Indexed: 05/22/2023]
Abstract
OBJECTIVES Staphylococcus epidermidis is the predominant pathogen of device-associated infections. By forming biofilms on the device surface, S epidermidis has substantial resistance to antibiotics and is difficult to eradicate. This study aimed to explore the synergistic effect of ultrasound (US)-mediated microbubbles combined with vancomycin on S epidermidis biofilms in a rabbit model. METHODS Two polytetrafluoroethene catheters with preformed S epidermidis biofilms were implanted subcutaneously in a rabbit, one on either side of the spine. Animals were randomized into different treatment groups, with each rabbit acting as its own control and treatment. Ultrasound was applied from 24 to 72 hours after surgery 2 times a day. The parameters were 300 kHz and 0.5 W/cm2 in a 50% duty cycle, with or without microbubbles injected subcutaneously into the implantation site. After treatments, animals were euthanized, and implants were removed for a scanning electron microscopic examination and bacterial counting. The hearts, kidneys, livers, and subcutaneous tissues were sent for histopathologic examinations. RESULTS Ultrasound + microbubbles increased the bactericidal action of vancomycin by decreasing biofilm viability from a mean ± SD of 6.44 ± 0.03 log10 colony-forming units per catheter in the control group to 3.49 ± 0.02 log10 colony-forming units per catheter in US + microbubble + vancomycin group (P < .001). The antibacterial effect of US + microbubbles + vancomycin was more pronounced than that of US + vancomycin (P < .001). Under scanning electron microscopy, biofilms exposed to US + microbubbles + vancomycin showed a greater reduction in thickness and bacterial density than other treatments. Histopathologic examinations showed no abnormalities in organs and skins. CONCLUSIONS Ultrasound microbubbles enhanced the antibacterial effect of vancomycin against S epidermidis biofilms in vivo without exerting obvious harms to the animals.
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Affiliation(s)
- Ying Dong
- Department of Neonatology, Children's Hospital of Fudan University, Shanghai, China
- Department of Neonatology, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Key Laboratory of Pediatrics in Chongqing, Chongqing International Science and Technology Cooperation Center for Child Development and Disorders, Chongqing, China
| | - Junshuai Li
- Department of Neonatology, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Key Laboratory of Pediatrics in Chongqing, Chongqing International Science and Technology Cooperation Center for Child Development and Disorders, Chongqing, China
- Department of Neonatology, Hunan Children's Hospital, Changsha, China
| | - Pan Li
- Chongqing Key Laboratory of Ultrasound Molecular Imaging, Chongqing, China
| | - Jialin Yu
- Department of Neonatology, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Key Laboratory of Pediatrics in Chongqing, Chongqing International Science and Technology Cooperation Center for Child Development and Disorders, Chongqing, China
- Department of Neonatology, Hunan Children's Hospital, Changsha, China
- Department of Pediatrics, Affiliated Hospital of Shenzhen University, Shenzhen, China
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Abstract
Onychomycosis is a difficult to treat fungal infection of the nails. The chronic nature of onychomycosis contributes to high recurrence rates and the difficulty in treating both dermatophyte and non-dermatophyte infections. It has been hypothesized that the formation of biofilms, sessile, multicellular communities of fungi surrounded by a protective extracellular matrix, allow for fungi to evade current antifungal therapies and contribute to observed antifungal resistance. This review presents the experimental evidence that has accumulated in recent years implicating biofilms in the pathogenesis of onychomycosis. Dermatophytes, non-dermatophyte molds, and yeasts form biofilms in vitro and a model using ex vivo healthy nail fragments has demonstrated biofilm formation on nails for dermatophyte, Candida, and Fusarium species. Implications for disease management are discussed with further research required to incorporate biofilm formation into future drug/device evaluation and treatment protocols.
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Affiliation(s)
- Aditya K Gupta
- Mediprobe Research Inc., London, Canada - .,Department of Medicine, School of Medicine, University of Toronto, Toronto, Canada -
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Enhancing the anti-biofilm activity of 5-aryl-2-aminoimidazoles through nature inspired dimerisation. Bioorg Med Chem 2018; 26:1470-1480. [PMID: 29449125 DOI: 10.1016/j.bmc.2018.01.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 01/08/2018] [Accepted: 01/09/2018] [Indexed: 11/22/2022]
Abstract
The increased tolerance of biofilms against disinfectants and antibiotics has stimulated research into new methods of biofilm prevention and eradication. In our previous work, we have identified the 5-aryl-2-aminoimidazole core as a scaffold that demonstrates preventive activity against biofilm formation of a broad range of bacterial and fungal species. Inspired by the dimeric nature of natural 2-aminoimidazoles of the oroidin family, we investigated the potential of dimers of our decorated 5-aryl-2-aminoimidazoles as biofilm inhibitors. A synthetic approach towards 2-aminoimidazole dimers linked by an alkyl chain was developed and a total of 48 dimers were synthesized. The linkers were introduced at two different positions, the N1-position or the N2-position, and the linker length and the substitution of the 5-phenyl ring (H, F, Cl, Br) were varied. Although, no clear correlation between linker length and biofilm inhibition was observed, a strong increase in anti-biofilm activity for almost all N1,N1'-linked dimers was obtained, compared to the respective monomers against Salmonella Typhimurium, Escherichia coli and Staphylococcus aureus. The N2,N2'-linked dimers, having a H- or F-substitution, were also found to show a strong increase in anti-biofilm activity compared to the respective monomers against these three bacterial species and against Pseudomonas aeruginosa. In addition, the obtained growth measurements suggest a broad concentration range with specific biofilm inhibition and no effect on the planktonic growth against Salmonella Typhimurium and Pseudomonas aeruginosa.
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16
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SawR a new regulator controlling pyomelanin synthesis in Pseudomonas aeruginosa. Microbiol Res 2018; 206:91-98. [DOI: 10.1016/j.micres.2017.10.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 09/26/2017] [Accepted: 10/08/2017] [Indexed: 02/02/2023]
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17
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Gupta AK, Carviel J, Shear NH. Antibiofilm Treatment for Onychomycosis and Chronic Fungal Infections. Skin Appendage Disord 2017; 4:136-140. [PMID: 30197888 DOI: 10.1159/000480023] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 08/03/2017] [Indexed: 01/05/2023] Open
Abstract
Onychomycosis is a difficult-to-treat chronic fungal infection of the nail. The chronic nature of onychomycosis, with relevance to current treatment practices, could be attributed to host anergy, development of increased virulence in causal agents (multidrug resistance efflux pump), and biofilms. Biofilms must be disrupted prior to antifungal treatment suggesting the necessity of combination treatment. Once the biofilm has been disrupted, further techniques in addition to antifungal usage are suggested to ensure a positive prognosis including use of antimicrobial photodynamic therapy or low-frequency surface acoustic waves. Overall, with continued success in developing antibiofilm treatment for bacterial and yeast pathogens, therapy can be more quickly expanded to dermatophytes. With a rise in predisposing factors, it is important to preemptively address treatment for this disease with continued investigation into antibiofilm therapy including optimal treatment combinations and dosages targeted specifically at dermatophytes.
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Affiliation(s)
- Aditya K Gupta
- Department of Medicine, University of Toronto School of Medicine, Toronto, ON, Canada.,Mediprobe Research Inc., London, ON, Canada
| | | | - Neil H Shear
- Division of Dermatology, Department of Medicine, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON, Canada
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18
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Antibiofilm effect of ultrasound combined with microbubbles against Staphylococcus epidermidis biofilm. Int J Med Microbiol 2017; 307:321-328. [DOI: 10.1016/j.ijmm.2017.06.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 05/13/2017] [Accepted: 06/04/2017] [Indexed: 12/21/2022] Open
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Preventing microbial biofilms on catheter tubes using ultrasonic guided waves. Sci Rep 2017; 7:616. [PMID: 28377583 PMCID: PMC5429618 DOI: 10.1038/s41598-017-00705-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 03/08/2017] [Indexed: 11/08/2022] Open
Abstract
Biofilms on indwelling tubes and medical prosthetic devices are among the leading causes of antibiotic-resistant bacterial infections. In this work, a new anti-biofilm catheter prototype was proposed. By combining an endotracheal tube (ET) with a group of ultrasonic guided wave (UGW) transducers, the general idea was to prevent bacteria aggregation with UGW vibrations. Based on quantitative analysis of UGW propagation, detailed approach was achieved through (a) selection of ultrasonic frequency, wave modes and vibration amplitude; and (b) adoption of wave coupling and 45° wave incidence technique. Performance of the proposed UGW-ET prototype was demonstrated via in vitro experiments, during which it deterred deposition of Pseudomonas aeruginosa (P. aeruginosa) biofilms successfully. With current configuration, UGW amplitudes ranged from 0.05-5 nm could be optimal to achieve biofilm prevention. This work sheds a light in the underlying mechanism of ultrasound-mediated biofilm prevention, and will inspire the development of new catheters of better antibacterial capability.
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20
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Patel V, Patel D, McGurk M, Sproat C, Kwok J. Flapless piezoelectric surgery in the management of jaw necrosis - a case series. ACTA ACUST UNITED AC 2017. [DOI: 10.1111/ors.12262] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- V. Patel
- Oral Surgery Department; Guys Dental Hospital; London UK
| | - D. Patel
- Oral Surgery Department; Guys Dental Hospital; London UK
| | - M. McGurk
- Department of Oral and Maxillofacial Surgery Dept; 250 Euston Road London NW1 2PG
| | - C. Sproat
- Oral Surgery Department; Guys Dental Hospital; London UK
| | - J. Kwok
- Oral Surgery Department; Guys Dental Hospital; London UK
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21
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Su H, Li Z, Dong Y, Jiang HX, Zheng HM, Du YH, Wu J, Wang ZB. Damage Effects on Bacille Calmette-Guérin by Low-Frequency, Low-Intensity Ultrasound: A Pilot Study. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2016; 35:581-587. [PMID: 26887448 DOI: 10.7863/ultra.14.11056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 07/06/2015] [Indexed: 06/05/2023]
Abstract
OBJECTIVES To perform an in vitro experimental study of the possible damage effects on Bacille Calmette-Guérin (BCG) by low-frequency (42-kHz) ultrasound (US) irradiation at low spatially and temporally averaged intensities and different exposure times. METHODS A 2-mL BCG suspension was added to the wells of a 24-well cell culture plate. Then the samples were randomly divided into 4 groups, each group including 3 wells, with group 1 as a control group and groups 2, 3, and 4, as US treatment groups. The samples for groups 2, 3, and 4 were irradiated with US at 0.13 W/cm(2) for 5 minutes, 0.13 W/cm(2) for 15 minutes, and 1.53 W/cm(2) for 15 minutes, respectively. After irradiation, the temperature, ratio of damage, and structure of the bacteria were examined. The cavitation effect of the device was detected by the passive cavitation detection method. RESULTS After US irradiation at the different doses (intensity and exposure time), no significant temperature change was found in all sample suspensions. The ratio of bacterial damage tested by flow cytometry and the optical density of the suspensions as assayed by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide colorimetric method showed that the US-irradiated groups were significantly different from the control group. The BCG damage ratio reached 28% at the intensity of 1.53 W/cm(2). Transmission electron microscopic results showed that the bacterial structure of BCG could be destroyed by low-frequency, low-intensity US. CONCLUSIONS Low-frequency, low-intensity US can cause acute injury to BCG, and the degree of injury is closely correlated with the US dose applied.
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Affiliation(s)
- Hang Su
- State Key Laboratory of Ultrasound Engineering in Medicine, Cofounded by Chongqing and the Ministry of Science and Technology, Chongqing Key Laboratory of Biomedical Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China (H.S., Z.L., Y.D., H.-Z.J., H.-M.Z, Y.-H.D., Z-.B.W.); and Department of Physics, University of Vermont, Burlington, Vermont USA (J.W.)
| | - Zhe Li
- State Key Laboratory of Ultrasound Engineering in Medicine, Cofounded by Chongqing and the Ministry of Science and Technology, Chongqing Key Laboratory of Biomedical Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China (H.S., Z.L., Y.D., H.-Z.J., H.-M.Z, Y.-H.D., Z-.B.W.); and Department of Physics, University of Vermont, Burlington, Vermont USA (J.W.)
| | - Yuan Dong
- State Key Laboratory of Ultrasound Engineering in Medicine, Cofounded by Chongqing and the Ministry of Science and Technology, Chongqing Key Laboratory of Biomedical Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China (H.S., Z.L., Y.D., H.-Z.J., H.-M.Z, Y.-H.D., Z-.B.W.); and Department of Physics, University of Vermont, Burlington, Vermont USA (J.W.)
| | - He-Xun Jiang
- State Key Laboratory of Ultrasound Engineering in Medicine, Cofounded by Chongqing and the Ministry of Science and Technology, Chongqing Key Laboratory of Biomedical Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China (H.S., Z.L., Y.D., H.-Z.J., H.-M.Z, Y.-H.D., Z-.B.W.); and Department of Physics, University of Vermont, Burlington, Vermont USA (J.W.)
| | - Hui-Min Zheng
- State Key Laboratory of Ultrasound Engineering in Medicine, Cofounded by Chongqing and the Ministry of Science and Technology, Chongqing Key Laboratory of Biomedical Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China (H.S., Z.L., Y.D., H.-Z.J., H.-M.Z, Y.-H.D., Z-.B.W.); and Department of Physics, University of Vermont, Burlington, Vermont USA (J.W.)
| | - Yong-Hong Du
- State Key Laboratory of Ultrasound Engineering in Medicine, Cofounded by Chongqing and the Ministry of Science and Technology, Chongqing Key Laboratory of Biomedical Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China (H.S., Z.L., Y.D., H.-Z.J., H.-M.Z, Y.-H.D., Z-.B.W.); and Department of Physics, University of Vermont, Burlington, Vermont USA (J.W.).
| | - Junru Wu
- State Key Laboratory of Ultrasound Engineering in Medicine, Cofounded by Chongqing and the Ministry of Science and Technology, Chongqing Key Laboratory of Biomedical Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China (H.S., Z.L., Y.D., H.-Z.J., H.-M.Z, Y.-H.D., Z-.B.W.); and Department of Physics, University of Vermont, Burlington, Vermont USA (J.W.)
| | - Zhi-Biao Wang
- State Key Laboratory of Ultrasound Engineering in Medicine, Cofounded by Chongqing and the Ministry of Science and Technology, Chongqing Key Laboratory of Biomedical Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China (H.S., Z.L., Y.D., H.-Z.J., H.-M.Z, Y.-H.D., Z-.B.W.); and Department of Physics, University of Vermont, Burlington, Vermont USA (J.W.)
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22
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Biofilm-related infections: bridging the gap between clinical management and fundamental aspects of recalcitrance toward antibiotics. Microbiol Mol Biol Rev 2015; 78:510-43. [PMID: 25184564 DOI: 10.1128/mmbr.00013-14] [Citation(s) in RCA: 762] [Impact Index Per Article: 84.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Surface-associated microbial communities, called biofilms, are present in all environments. Although biofilms play an important positive role in a variety of ecosystems, they also have many negative effects, including biofilm-related infections in medical settings. The ability of pathogenic biofilms to survive in the presence of high concentrations of antibiotics is called "recalcitrance" and is a characteristic property of the biofilm lifestyle, leading to treatment failure and infection recurrence. This review presents our current understanding of the molecular mechanisms of biofilm recalcitrance toward antibiotics and describes how recent progress has improved our capacity to design original and efficient strategies to prevent or eradicate biofilm-related infections.
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23
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Bandara HMHN, Harb A, Kolacny D, Martins P, Smyth HDC. Sound waves effectively assist tobramycin in elimination of Pseudomonas aeruginosa biofilms in vitro. AAPS PharmSciTech 2014; 15:1644-54. [PMID: 25155975 DOI: 10.1208/s12249-014-0200-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Accepted: 08/08/2014] [Indexed: 12/20/2022] Open
Abstract
Microbial biofilms are highly refractory to antimicrobials. The aim of this study was to investigate the use of low-frequency vibration therapy (20-20 kHz) on antibiotic-mediated Pseudomonas aeruginosa biofilm eradication. In screening studies, low-frequency vibrations were applied on model biofilm compositions to identify conditions in which surface standing waves were observed. Alginate surface tension and viscosity were also measured. The effect of vibration on P. aeruginosa biofilms was studied using a standard biofilm assay. Subminimal inhibitory concentrations (sub-MIC) of tobramycin (5 μg/ml) were added to biofilms 3 h prior, during, and immediately after vibration and quantitatively assessed by (2,3-bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide) reduction assay (XTT) and, qualitatively, by confocal laser scanning microscopy (CLSM). The standing waves occurred at frequencies <1,000 Hz. Biofilms vibrated without sub-MIC tobramycin showed a significantly reduced metabolism compared to untreated controls (p < 0.05). Biofilms treated with tobramycin and vibrated simultaneously (450, 530, 610, and 650 Hz), or vibrated (450 and 650 Hz) then treated with tobramycin subsequently, or vibrated (610 Hz, 650 Hz) after 3 h of tobramycin treatment showed significantly lower metabolism compared to P. aeruginosa biofilm treated with tobramycin alone (p < 0.05). CLSM imaging further confirmed these findings. Low frequency vibrations assisted tobramycin in killing P. aeruginosa biofilms at sub-MIC. Thus, sound waves together with antibiotics are a promising approach in eliminating pathogenic biofilms.
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Blus C, Szmukler-Moncler S, Giannelli G, Denotti G, Orrù G. Use of Ultrasonic Bone Surgery (Piezosurgery) to Surgically Treat Bisphosphonate-Related Osteonecrosis of the Jaws (BRONJ). A Case Series Report with at Least 1 Year of Follow-Up. Open Dent J 2013; 7:94-101. [PMID: 24044030 PMCID: PMC3772575 DOI: 10.2174/1874210601307010094] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Revised: 04/16/2013] [Accepted: 04/30/2013] [Indexed: 12/05/2022] Open
Abstract
This preliminary work documents the use of a powerful piezosurgery device to treat biphosphonate-related osteonecrosis of the jaw (BRONJ) in combination with classical medication therapy. Eight patients presenting 9 BRONJ sites were treated, 2 in the maxilla and 7 in the mandible. Reason for biphosphonate (BiP) intake was treatment of an oncologic disease for 5 patients and osteoporosis for 3. The oncologic and osteoporosis patients were diagnosed with BRONJ after 35-110 months and 80-183 months of BiP treatment, respectively. BRONJ 2 and 3 was found in 4 patients. Resection of the bone sequestrae was performed with a high power ultrasonic (piezo) surgery and antibiotics were administrated for 2 weeks. Soft tissue healing was incomplete at the 2-week control but it was achieved within 1 month. At the 1-year control, soft tissue healing was maintained at all patients, without symptom recurrence. One patient with paraesthesia had abated; of the 2 pa-tients with trismus, one was healed, severity of the second trismus abated. This case report series suggests that bone resection performed with a high power ultrasonic surgery device combined with antibiotics might lead to BRONJ healing. More patients are warranted to confirm the present findings and assess this treatment approach.
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Affiliation(s)
- Cornelio Blus
- OBL, Department of Surgical Sciences, University of Cagliari, Cagliari, Italy ; Private Practice, Torino, Italy
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25
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Loike JD, Plitt A, Kothari K, Zumeris J, Budhu S, Kavalus K, Ray Y, Jacob H. Surface acoustic waves enhance neutrophil killing of bacteria. PLoS One 2013; 8:e68334. [PMID: 23936303 PMCID: PMC3735547 DOI: 10.1371/journal.pone.0068334] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 05/28/2013] [Indexed: 11/18/2022] Open
Abstract
Biofilms are structured communities of bacteria that play a major role in the pathogenicity of bacteria and are the leading cause of antibiotic resistant bacterial infections on indwelling catheters and medical prosthetic devices. Failure to resolve these biofilm infections may necessitate the surgical removal of the prosthetic device which can be debilitating and costly. Recent studies have shown that application of surface acoustic waves to catheter surfaces can reduce the incidence of infections by a mechanism that has not yet been clarified. We report here the effects of surface acoustic waves (SAW) on the capacity of human neutrophils to eradicate S. epidermidis bacteria in a planktonic state and within biofilms. Utilizing a novel fibrin gel system that mimics a tissue-like environment, we show that SAW, at an intensity of 0.3 mW/cm2, significantly enhances human neutrophil killing of S. epidermidis in a planktonic state and within biofilms by enhancing human neutrophil chemotaxis in response to chemoattractants. In addition, we show that the integrin CD18 plays a significant role in the killing enhancement observed in applying SAW. We propose from out data that this integrin may serve as mechanoreceptor for surface acoustic waves enhancing neutrophil chemotaxis and killing of bacteria.
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Affiliation(s)
- John D Loike
- Department of Physiology and Cellular Biophysics, Columbia University College of Physicians and Surgeons, New York, New York, United States of America.
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Bridier A, Chalabaev S, Ghigo JM, Briandet R. Biofilms 5 International Conference: meeting report. Res Microbiol 2013; 164:490-6. [PMID: 23524185 DOI: 10.1016/j.resmic.2013.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Arnaud Bridier
- IRSTEA, HBAN, 1 rue Pierre-Gilles de Gennes, 92761 Antony cedex, France
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27
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Choi CH, Scardino AJ, Dylejko PG, Fletcher LE, Juniper R. The effect of vibration frequency and amplitude on biofouling deterrence. BIOFOULING 2013; 29:195-202. [PMID: 23330727 DOI: 10.1080/08927014.2012.760125] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The use of vibration is proposed as a means of controlling the settlement of marine fouling organisms. In this study, panels with embedded lead zirconate titanate, known as PZT, were placed in the field over 3 months. The panels were vibrated at different velocity levels at frequencies between 70 and 445 Hz. It was found that barnacles (Amphibalanus variegatus Darwin and Elminius sp.) were the only fouling organisms affected by the applied vibration, and these organisms settled in significantly lower numbers when the plates were excited at specific frequencies and amplitudes. Panels vibrating at relatively higher frequencies, greater than 260 Hz, exhibited reduced barnacle settlement, whilst lower frequencies in the 70-100 Hz range had little or no effect. The settlement of other fouling organisms such as tubeworms, bryozoans, ascidians and algae did not appear to be affected by the applied excitation. The experimental results showed that increasing the velocity amplitude of vibration was a contributing factor in inhibiting barnacle settlement.
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Affiliation(s)
- C H Choi
- Maritime Platforms Division, Defence Science & Technology Organisation, Melbourne, Australia
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Guo S, Lee HP, Teo SLM, Khoo BC. Inhibition of barnacle cyprid settlement using low frequency and intensity ultrasound. BIOFOULING 2012; 28:131-141. [PMID: 22296259 DOI: 10.1080/08927014.2012.658511] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Low frequency, low intensity ultrasound was demonstrated as an effective inhibitor of barnacle cyprid settlement. When the same substratum vibration amplitude (10.05 nm) and acoustic pressure (5 kPa) were applied, ultrasound at a frequency of 23 kHz significantly reduced cyprid settlement. The mechanism appeared to differ from the ultrasonic cavitation induced inhibition previously reported as no increased mortality was observed, and no change in the exploratory behaviour of cyprids was observed when they were exposed to this continuous ultrasonic irradiation regime. The application of ultrasound treatment in an intermittent mode of '5 min on and 20 min off' at 20-25 kHz and at the low intensity of 5 kPa produced the same effect as the continuous application of 23 kHz. This energy efficient approach to the use of low frequency, low intensity ultrasound may present a promising and efficient strategy regarding irradiation treatment for antifouling applications.
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Affiliation(s)
- Shifeng Guo
- Department of Mechanical Engineering, National University of Singapore, Singapore, 117576.
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