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Lyons N, Wu W, Jin Y, Lamont IL, Pletzer D. Using host-mimicking conditions and a murine cutaneous abscess model to identify synergistic antibiotic combinations effective against Pseudomonas aeruginosa. Front Cell Infect Microbiol 2024; 14:1352339. [PMID: 38808066 PMCID: PMC11130353 DOI: 10.3389/fcimb.2024.1352339] [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: 12/08/2023] [Accepted: 04/25/2024] [Indexed: 05/30/2024] Open
Abstract
Antibiotic drug combination therapy is critical for the successful treatment of infections caused by multidrug resistant pathogens. We investigated the efficacy of β-lactam and β-lactam/β-lactamase inhibitor combinations with other antibiotics, against the hypervirulent, ceftazidime/avibactam resistant Pseudomonas aeruginosa Liverpool epidemic strain (LES) B58. Although minimum inhibitory concentrations in vitro differed by up to eighty-fold between standard and host-mimicking media, combinatorial effects only marginally changed between conditions for some combinations. Effective combinations in vitro were further tested in a chronic, high-density murine infection model. Colistin and azithromycin demonstrated combinatorial effects with ceftazidime and ceftazidime/avibactam both in vitro and in vivo. Conversely, while tobramycin and tigecycline exhibited strong synergy in vitro, this effect was not observed in vivo. Our approach of using host-mimicking conditions and a sophisticated animal model to evaluate drug synergy against bacterial pathogens represents a promising approach. This methodology may offer insights into the prediction of combination therapy outcomes and the identification of potential treatment failures.
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Affiliation(s)
- Nikita Lyons
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
- Department of Biochemistry, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Weihui Wu
- Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Yongxin Jin
- Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Iain L. Lamont
- Department of Biochemistry, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Daniel Pletzer
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
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2
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Tabassum N, Khan F, Jeong GJ, Oh D, Kim YM. Antibiofilm and antivirulence activities of laminarin-gold nanoparticles in standard and host-mimicking media. Appl Microbiol Biotechnol 2024; 108:203. [PMID: 38349556 PMCID: PMC10864539 DOI: 10.1007/s00253-024-13050-4] [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: 06/27/2023] [Revised: 01/02/2024] [Accepted: 02/05/2024] [Indexed: 02/15/2024]
Abstract
The rapidly rising antimicrobial resistance (AMR) in pathogenic bacteria has become one of the most serious public health challenges, with a high death rate. Most pathogenic bacteria have been recognized as a source of AMR and a primary barrier to antimicrobial treatment failure due to the development of biofilms and the production of virulence factors. In this work, nanotechnology was employed as a substitute method to control the formation of biofilms and attenuate virulence features in Pseudomonas aeruginosa and Staphylococcus aureus. We synthesized biocompatible gold nanoparticles from marine-derived laminarin as potential biofilm and virulence treatments. Laminarin-gold nanoparticles (Lam-AuNPs) have been identified as spherical, 49.84 ± 7.32 nm in size and - 26.49 ± 1.29 mV zeta potential. The MIC value of Lam-AuNPs against several drug-resistant microbial pathogens varied from 2 to 1024 μg/mL in both standard and host-mimicking media. Sub-MIC values of Lam-AuNPs were reported to effectively reduce the production of P. aeruginosa and S. aureus biofilms in both standard and host-mimicking growth media. Furthermore, the sub-MIC of Lam-AuNPs strongly reduced hemolysis, pyocyanin, pyoverdine, protease, and several forms of flagellar and pili-mediated motility in P. aeruginosa. Lam-AuNPs also inhibited S. aureus hemolysis and the production of amyloid fibrils. The Lam-AuNPs strongly dispersed the preformed mature biofilm of these pathogens in a dose-dependent manner. The Lam-AuNPs would be considered an alternative antibiofilm and antivirulence agent to control P. aeruginosa and S. aureus infections. KEY POINTS: • Lam-AuNPs were biosynthesized to control biofilm and virulence. • Lam-AuNPs show effective biofilm inhibition in standard and host-mimicking media. • Lam-AuNPs suppress various virulence factors of P. aeruginosa and S. aureus.
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Affiliation(s)
- Nazia Tabassum
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea
- Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan, 48513, Republic of Korea
| | - Fazlurrahman Khan
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea.
- Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan, 48513, Republic of Korea.
- Institute of Fisheries Sciences, Pukyong National University, Busan, 48513, Republic of Korea.
| | - Geum-Jae Jeong
- Department of Food Science and Technology, Pukyong National University, Busan, 48513, Republic of Korea
| | - Dokyung Oh
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea
- Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan, 48513, Republic of Korea
- Department of Food Science and Technology, Pukyong National University, Busan, 48513, Republic of Korea
| | - Young-Mog Kim
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea.
- Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan, 48513, Republic of Korea.
- Department of Food Science and Technology, Pukyong National University, Busan, 48513, Republic of Korea.
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Yang S, Li X, Cang W, Mu D, Ji S, An Y, Wu R, Wu J. Biofilm tolerance, resistance and infections increasing threat of public health. MICROBIAL CELL (GRAZ, AUSTRIA) 2023; 10:233-247. [PMID: 37933277 PMCID: PMC10625689 DOI: 10.15698/mic2023.11.807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 08/28/2023] [Accepted: 09/14/2023] [Indexed: 11/08/2023]
Abstract
Microbial biofilms can cause chronic infection. In the clinical setting, the biofilm-related infections usually persist and reoccur; the main reason is the increased antibiotic resistance of biofilms. Traditional antibiotic therapy is not effective and might increase the threat of antibiotic resistance to public health. Therefore, it is urgent to study the tolerance and resistance mechanism of biofilms to antibiotics and find effective therapies for biofilm-related infections. The tolerance mechanism and host reaction of biofilm to antibiotics are reviewed, and bacterial biofilm related diseases formed by human pathogens are discussed thoroughly. The review also explored the role of biofilms in the development of bacterial resistance mechanisms and proposed therapeutic intervention strategies for biofilm related diseases.
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Affiliation(s)
- Shanshan Yang
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, P.R. China
- Shenyang Key Laboratory of Microbial Fermentation Technology Innovation, Shenyang 110866, P.R. China
| | - Xinfei Li
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, P.R. China
- Liaoning Engineering Research Center of Food Fermentation Technology, Shenyang 110866, P.R. China
| | - Weihe Cang
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, P.R. China
- Liaoning Engineering Research Center of Food Fermentation Technology, Shenyang 110866, P.R. China
| | - Delun Mu
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, P.R. China
- Shenyang Key Laboratory of Microbial Fermentation Technology Innovation, Shenyang 110866, P.R. China
| | - Shuaiqi Ji
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, P.R. China
- Shenyang Key Laboratory of Microbial Fermentation Technology Innovation, Shenyang 110866, P.R. China
| | - Yuejia An
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, P.R. China
| | - Rina Wu
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, P.R. China
- Liaoning Engineering Research Center of Food Fermentation Technology, Shenyang 110866, P.R. China
- Shenyang Key Laboratory of Microbial Fermentation Technology Innovation, Shenyang 110866, P.R. China
| | - Junrui Wu
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, P.R. China
- Liaoning Engineering Research Center of Food Fermentation Technology, Shenyang 110866, P.R. China
- Shenyang Key Laboratory of Microbial Fermentation Technology Innovation, Shenyang 110866, P.R. China
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Maset RG, Hapeshi A, Lapage J, Harrington N, Littler J, Perrier S, Harrison F. Combining SNAPs with antibiotics shows enhanced synergistic efficacy against S. aureus and P. aeruginosa biofilms. NPJ Biofilms Microbiomes 2023; 9:36. [PMID: 37291132 PMCID: PMC10250483 DOI: 10.1038/s41522-023-00401-8] [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: 12/07/2022] [Accepted: 05/18/2023] [Indexed: 06/10/2023] Open
Abstract
Biofilm infections are associated with a high mortality risk for patients. Antibiotics perform poorly against biofilm communities, so high doses and prolonged treatments are often used in clinical settings. We investigated the pairwise interactions of two synthetic nano-engineered antimicrobial polymers (SNAPs). The g-D50 copolymer was synergistic with penicillin and silver sulfadiazine against planktonic Staphylococcus aureus USA300 in synthetic wound fluid. Furthermore, the combination of g-D50 and silver sulfadiazine showed a potent synergistic antibiofilm activity against S. aureus USA300 using in vitro and ex vivo wound biofilm models. The a-T50 copolymer was synergistic with colistin against planktonic Pseudomonas aeruginosa in synthetic cystic fibrosis medium, and this pair showed a potent synergistic antibiofilm activity against P. aeruginosa in an ex vivo cystic fibrosis lung model. SNAPs thus have the potential for increased antibiofilm performance in combination with certain antibiotics to shorten prolonged treatments and reduce dosages against biofilm infection.
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Affiliation(s)
| | - Alexia Hapeshi
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK
| | - John Lapage
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
| | - Niamh Harrington
- Department of Evolution, Ecology and Behaviour, Institute of Infection, Veterinary and Ecological Science, University of Liverpool, Liverpool, L69 7ZV, UK
| | - Jenny Littler
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
| | - Sébastien Perrier
- Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK.
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.
- Faculty of Pharmacy and Pharmaceutical Sciences, Monash University, Parkville, Victoria, 3052, Australia.
| | - Freya Harrison
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK.
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Ciofu O, Moser C, Jensen PØ, Høiby N. Tolerance and resistance of microbial biofilms. Nat Rev Microbiol 2022; 20:621-635. [PMID: 35115704 DOI: 10.1038/s41579-022-00682-4] [Citation(s) in RCA: 273] [Impact Index Per Article: 136.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/04/2022] [Indexed: 02/07/2023]
Abstract
Chronic infections caused by microbial biofilms represent an important clinical challenge. The recalcitrance of microbial biofilms to antimicrobials and to the immune system is a major cause of persistence and clinical recurrence of these infections. In this Review, we present the extent of the clinical problem, and the mechanisms underlying the tolerance of biofilms to antibiotics and to host responses. We also explore the role of biofilms in the development of antimicrobial resistance mechanisms.
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Affiliation(s)
- Oana Ciofu
- Department of Immunology and Microbiology, Costerton Biofilm Center, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
| | - Claus Moser
- Department of Immunology and Microbiology, Costerton Biofilm Center, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen, Denmark
| | - Peter Østrup Jensen
- Department of Immunology and Microbiology, Costerton Biofilm Center, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen, Denmark
| | - Niels Høiby
- Department of Immunology and Microbiology, Costerton Biofilm Center, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen, Denmark
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Dehkordi SMH, Anvar SA, Rahimi E, Ahari H, Ataee M. Molecular investigation of prevalence, phenotypic and genotypic diversity, antibiotic resistance, frequency of virulence genes and genome sequencing in Pseudomonas aeruginosa strains isolated from lobster. Int J Food Microbiol 2022; 382:109901. [DOI: 10.1016/j.ijfoodmicro.2022.109901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 05/31/2022] [Accepted: 08/24/2022] [Indexed: 11/30/2022]
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Chen X, Liu M, Zhang P, Xu M, Yuan W, Bian L, Liu Y, Xia J, Leung SSY. Phage-Derived Depolymerase as an Antibiotic Adjuvant Against Multidrug-Resistant Acinetobacter baumannii. Front Microbiol 2022; 13:845500. [PMID: 35401491 PMCID: PMC8990738 DOI: 10.3389/fmicb.2022.845500] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 02/08/2022] [Indexed: 11/29/2022] Open
Abstract
Bacteriophage-encoded depolymerases are responsible for degrading capsular polysaccharides (CPS), lipopolysaccharides (LPS), and exopolysaccharides (EPS) of the host bacteria during phage invasion. They have been considered as promising antivirulence agents in controlling bacterial infections, including those caused by multidrug-resistant (MDR) bacteria. This feature inspires hope of utilizing these enzymes to disarm the polysaccharide capsules of the bacterial cells, which then strengthens the action of antibiotics. Here we have identified, cloned, and expressed a depolymerase Dpo71 from a bacteriophage specific for the gram-negative bacterium Acinetobacter baumannii in a heterologous host Escherichia coli. Dpo71 sensitizes the MDR A. baumannii to the host immune attack, and also acts as an adjuvant to assist or boost the action of antibiotics, for example colistin. Specifically, Dpo71 at 10 μg/ml enables a complete bacterial eradication by human serum at 50% volume ratio. A mechanistic study shows that the enhanced bactericidal effect of colistin is attributed to the improved outer membrane destabilization capacity and binding rate to bacteria after stripping off the bacterial capsule by Dpo71. Dpo71 inhibits biofilm formation and disrupts the pre-formed biofilm. Combination of Dpo71 could significantly enhance the antibiofilm activity of colistin and improve the survival rate of A. baumannii infected Galleria mellonella. Dpo71 retains the strain-specificity of the parent phage from which Dpo71 is derived: the phage-sensitive A. baumannii strains respond to Dpo71 treatment, whereas the phage-insensitive strains do not. In summary, our work demonstrates the feasibility of using recombinant depolymerases as an antibiotic adjuvant to supplement the development of new antibacterials and to battle against MDR pathogens.
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Affiliation(s)
- Xi Chen
- Department of Chemistry, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, China
| | - Miao Liu
- Department of Chemistry, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, China
| | - Pengfei Zhang
- School of Pharmacy, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, China
| | - Miao Xu
- School of Pharmacy, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, China
| | - Weihao Yuan
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, China
| | - Liming Bian
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, China
| | - Yannan Liu
- Emergency Medicine Clinical Research Center, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China
| | - Jiang Xia
- Department of Chemistry, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, China
| | - Sharon S Y Leung
- School of Pharmacy, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, China
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8
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Alginate oligosaccharides enhance diffusion and activity of colistin in a mucin-rich environment. Sci Rep 2022; 12:4986. [PMID: 35322119 PMCID: PMC8943044 DOI: 10.1038/s41598-022-08927-1] [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: 12/17/2021] [Accepted: 03/10/2022] [Indexed: 11/16/2022] Open
Abstract
In a number of chronic respiratory diseases e.g. cystic fibrosis (CF) and chronic obstructive pulmonary disease (COPD), the production of viscous mucin reduces pulmonary function and represents an effective barrier to diffusion of inhaled therapies e.g. antibiotics. Here, a 2-compartment Transwell model was developed to study impaired diffusion of the antibiotic colistin across an artificial sputum (AS) matrix/medium and to quantify its antimicrobial activity against Pseudomonas aeruginosa NH57388A biofilms (alone and in combination with mucolytic therapy). High-performance liquid chromatography coupled with fluorescence detection (HPLC-FLD) revealed that the presence of AS medium significantly reduced the rate of colistin diffusion (> 85% at 48 h; p < 0.05). Addition of alginate oligosaccharide (OligoG CF-5/20) significantly improved colistin diffusion by 3.7 times through mucin-rich AS medium (at 48 h; p < 0.05). Increased diffusion of colistin with OligoG CF-5/20 was shown (using confocal laser scanning microscopy and COMSTAT image analysis) to be associated with significantly increased bacterial killing (p < 0.05). These data support the use of this model to study drug and small molecule delivery across clinically-relevant diffusion barriers. The findings indicate the significant loss of colistin and reduced effectiveness that occurs with mucin binding, and support the use of mucolytics to improve antimicrobial efficacy and lower antibiotic exposure.
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9
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Inter-species interactions alter antibiotic efficacy in bacterial communities. THE ISME JOURNAL 2022; 16:812-821. [PMID: 34628478 PMCID: PMC8857223 DOI: 10.1038/s41396-021-01130-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 09/16/2021] [Accepted: 09/23/2021] [Indexed: 11/14/2022]
Abstract
The efficacy of antibiotic treatments targeting polymicrobial communities is not well predicted by conventional in vitro susceptibility testing based on determining minimum inhibitory concentration (MIC) in monocultures. One reason for this is that inter-species interactions can alter the community members' susceptibility to antibiotics. Here we quantify, and identify mechanisms for, community-modulated changes of efficacy for clinically relevant antibiotics against the pathogen Pseudomonas aeruginosa in model cystic fibrosis (CF) lung communities derived from clinical samples. We demonstrate that multi-drug resistant Stenotrophomonas maltophilia can provide high levels of antibiotic protection to otherwise sensitive P. aeruginosa. Exposure protection to imipenem was provided by chromosomally encoded metallo-β-lactamase that detoxified the environment; protection was dependent upon S. maltophilia cell density and was provided by S. maltophilia strains isolated from CF sputum, increasing the MIC of P. aeruginosa by up to 16-fold. In contrast, the presence of S. maltophilia provided no protection against meropenem, another routinely used carbapenem. Mathematical ordinary differential equation modelling shows that the level of exposure protection provided against different carbapenems can be explained by differences in antibiotic efficacy and inactivation rate. Together, these findings reveal that exploitation of pre-occurring antimicrobial resistance, and inter-specific competition, can have large impacts on pathogen antibiotic susceptibility, highlighting the importance of microbial ecology for designing successful antibiotic treatments for multispecies communities.
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Thomas GH. Microbial Musings – January 2021. Microbiology (Reading) 2021; 167. [PMID: 33512314 PMCID: PMC8116778 DOI: 10.1099/mic.0.001033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Gavin H. Thomas
- Department of Biology, University of York, York YO10 5YW, UK
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Thomas GH. Microbial Musings - December 2020. MICROBIOLOGY (READING, ENGLAND) 2020; 166:1107-1109. [PMID: 33353584 PMCID: PMC7819357 DOI: 10.1099/mic.0.001019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Indexed: 11/18/2022]
Affiliation(s)
- Gavin H. Thomas
- Department of Biology, University of York, York, YO10 5YW, UK
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