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Gaurav A, Kothari A, Omar BJ, Pathania R. Assessment of polymyxin B-doxycycline in combination against Pseudomonas aeruginosa in vitro and in a mouse model of acute pneumonia. Int J Antimicrob Agents 2020; 56:106022. [PMID: 32439481 DOI: 10.1016/j.ijantimicag.2020.106022] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 05/06/2020] [Accepted: 05/08/2020] [Indexed: 12/18/2022]
Abstract
The increasing prevalence of antibiotic resistance in Pseudomonas aeruginosa has created an urgent need for suitable therapy. This study explored the pairing of doxycycline with other antipseudomonal antibiotics, and found that polymyxin B in combination with doxycycline had a synergistic effect against clinical strains of P. aeruginosa. This synergistic combination was studied by checkerboard assays and time-kill curve analysis. Further, in-vitro biofilm disruption, pyoverdine inhibition assays were performed. The efficacy of polymyxin B-doxycycline in combination, administered by inhalation, was evaluated using a mouse model of acute pneumonia. The combination was found to have a synergistic effect in both in-vitro and in-vivo studies. The combination decreased biofilms of P. aeruginosa and reduced the level of pyoverdine, an important siderophore of P. aeruginosa. In addition, the combination decreased the P. aeruginosa population by 3 log10 (P<0.01) in the mouse model of acute pneumonia, and showed an improvement in lung function by inhalation. To the best of the authors' knowledge, this is the first in-vivo study to evaluate the efficacy of polymyxin B in combination with doxycycline against P. aeruginosa, showing a possible promising option for acute pneumonia due to multi-drug-resistant P. aeruginosa.
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Affiliation(s)
- Amit Gaurav
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
| | - Ashish Kothari
- Department of Microbiology, All India Institute of Medical Sciences Rishikesh, Rishikesh, Uttarakhand, India
| | - Balram Ji Omar
- Department of Microbiology, All India Institute of Medical Sciences Rishikesh, Rishikesh, Uttarakhand, India
| | - Ranjana Pathania
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India.
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Dawan J, Uddin MJ, Ahn J. Development of de novo resistance in Salmonella Typhimurium treated with antibiotic combinations. FEMS Microbiol Lett 2019; 366:5513443. [PMID: 31183498 DOI: 10.1093/femsle/fnz127] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 06/06/2019] [Indexed: 12/21/2022] Open
Abstract
This study was designed to evaluate the evolution of antibiotic resistance in Salmonella enterica serovar Typhimurium treated with the combination of antibiotics. The experimental evolution of antibiotic resistance of S. Typhimurium was evaluated either under single antibiotic (kanamycin, KAN; penicillin, PEN; erythromycin, ERY) or in combination of two antibiotics (KAN + PEN or KAN + ERY) as measured by fractional inhibitory concentrations (FICs), stepwise resistance selection, cross-resistance evaluation, resistance fitness and relative gene expression. KAN + PEN and KAN + ERY showed the synergistic effect against S. Typhimurium (FIC index < 0.5). KAN + ERY delayed the induction of de novo mutations in S. Typhimurium. The cross-resistance of S. Typhimurium to all antibiotics except ERY and tetracycline was observed in KAN and PEN alone. The fitness cost was lower in single antibiotic treatments than combinations. The highest relative fitness was 0.91 in PEN, followed by KAN (0.84) and ERY (0.78), indicating the low fitness costs in single antibiotic treatments. The overexpression of efflux pump-related genes (acrA and acrB), outer membrane-related gene (ompC) and adherence-related gene (csgD) were observed in the single antibiotic treatments. Our results suggest that KAN + PEN and KAN + ERY could be used as a potential therapeutic treatment by decreasing the evolution of antibiotic resistance in S. Typhimurium and reusing conventional antibiotics.
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Affiliation(s)
- Jirapat Dawan
- Department of Medical Biomaterials Engineering and Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - Md Jalal Uddin
- Department of Medical Biomaterials Engineering and Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - Juhee Ahn
- Department of Medical Biomaterials Engineering and Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
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Fox DJ, Cooper MD, Speil CA, Roberts MH, Yanik SC, Meech RP, Hargrove TL, Verhulst SJ, Rybak LP, Campbell KCM. d-Methionine reduces tobramycin-induced ototoxicity without antimicrobial interference in animal models. J Cyst Fibros 2015; 15:518-30. [PMID: 26166286 DOI: 10.1016/j.jcf.2015.06.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Revised: 06/19/2015] [Accepted: 06/19/2015] [Indexed: 12/21/2022]
Abstract
BACKGROUND Tobramycin is a critical cystic fibrosis treatment however it causes ototoxicity. This study tested d-methionine protection from tobramycin-induced ototoxicity and potential antimicrobial interference. METHODS Auditory brainstem responses (ABRs) and outer hair cell (OHC) quantifications measured protection in guinea pigs treated with tobramycin and a range of d-methionine doses. In vitro antimicrobial interference studies tested inhibition and post antibiotic effect assays. In vivo antimicrobial interference studies tested normal and neutropenic Escherichia coli murine survival and intraperitoneal lavage bacterial counts. RESULTS d-Methionine conferred significant ABR threshold shift reductions. OHC protection was less robust but significant at 20kHz in the 420mg/kg/day group. In vitro studies did not detect d-methionine-induced antimicrobial interference. In vivo studies did not detect d-methionine-induced interference in normal or neutropenic mice. CONCLUSIONS d-Methionine protects from tobramycin-induced ototoxicity without antimicrobial interference. The study results suggest d-met as a potential otoprotectant from clinical tobramycin use in cystic fibrosis patients.
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Affiliation(s)
- Daniel J Fox
- Department of Surgery, Southern Illinois University School of Medicine, Springfield, IL, USA; Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL, USA; Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA.
| | - Morris D Cooper
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Cristian A Speil
- Department of Internal Medicine, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Melissa H Roberts
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Susan C Yanik
- Department of Surgery, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Robert P Meech
- Department of Surgery, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Tim L Hargrove
- Department of Surgery, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Steven J Verhulst
- Statistics and Research Consulting, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Leonard P Rybak
- Department of Surgery, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Kathleen C M Campbell
- Department of Surgery, Southern Illinois University School of Medicine, Springfield, IL, USA; Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL, USA
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Maaland MG, Mo SS, Schwarz S, Guardabassi L. In vitro
assessment of chloramphenicol and florfenicol as second-line antimicrobial agents in dogs. J Vet Pharmacol Ther 2015; 38:443-50. [DOI: 10.1111/jvp.12204] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 12/29/2014] [Indexed: 11/30/2022]
Affiliation(s)
- M. G. Maaland
- Department of Veterinary Disease Biology; Faculty of Health and Medical Sciences; University of Copenhagen; Frederiksberg Denmark
| | - S. S. Mo
- National Veterinary Institute; Oslo Norway
| | - S. Schwarz
- Institute of Farm Animal Genetics; Friedrich-Loeffler-Institut (FLI); Neustadt-Mariensee Germany
| | - L. Guardabassi
- Department of Veterinary Disease Biology; Faculty of Health and Medical Sciences; University of Copenhagen; Frederiksberg Denmark
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Cassanelli C, Marchese A, Cagnacci S, Debbia EA. Alteration of Membrane Permeability of Bacteria and Yeast by High Frequency Alternating Current (HFAC). Open Microbiol J 2008; 2:32-7. [PMID: 19088909 PMCID: PMC2593037 DOI: 10.2174/1874285800802010032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2008] [Revised: 03/30/2008] [Accepted: 04/04/2008] [Indexed: 11/22/2022] Open
Abstract
Aims: Endox® Endodontic System (Endox) is used for endodontic treatment by a high frequency alternating current (HFAC). This device damaged the envelopes of spores and vegetative organisms. If the integrity of the envelope is compromised, the transit of compounds in the two directions is possible. This latter aspect was investigated here. Methods: The instrument delivered a 60ms pulse at a frequency 300 kHz, and power 800 KV/m. DNA transfer was verified using Escherichia coli K-12 strain carrying a non conjugative plasmid pBP517 (gyrA+) as donor and a rifampicin and nalidixic acid resistant recipient. 0.2 ml of mixture of donor and recipient strains in saline was exposed to HFAC and plated on selective media. Uptake of antimicrobials and a delay in re-growth was assessed exposing the strains to HFAC. Results: Plasmid transfer was detected under different experimental conditions. From 9 to 27 recombinants were found. Representative recombinants cured from plasmid showed the original phenotype. HFAC promoted the uptake of ineffective antibiotics, and induces a 1 h of delay in re-growth on the strains. Conclusions: Endox exhibited an effect on microrganisms which is reminiscent with that occuring in electroporation, but with a mode of action that saved materials and time.
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Affiliation(s)
- C Cassanelli
- Sez. Microbiology- DISCAT, University of Genova, Largo Rosanna Benzi 10, 16132 Genova, Italy
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Pasquardini L, Lunelli L, Vanzetti L, Anderle M, Pederzolli C. Immobilization of cationic rifampicin-loaded liposomes on polystyrene for drug-delivery applications. Colloids Surf B Biointerfaces 2008; 62:265-72. [DOI: 10.1016/j.colsurfb.2007.10.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2006] [Revised: 07/21/2007] [Accepted: 10/24/2007] [Indexed: 10/22/2022]
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