1
|
Banerjee T, Adwityama A, Sharma S, Mishra K, Prusti P, Maitra U. Comparative evaluation of colistin broth disc elution (CBDE) and broth microdilution (BMD) in clinical isolates of Pseudomonas aeruginosa with special reference to heteroresistance. Indian J Med Microbiol 2024; 47:100494. [PMID: 37890411 DOI: 10.1016/j.ijmmb.2023.100494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Revised: 10/10/2023] [Accepted: 10/10/2023] [Indexed: 10/29/2023]
Abstract
PURPOSE Antimicrobial resistance (AMR) in Pseudomonas aeruginosa has been ever-increasing. Among other reasons, colistin resistance might be attributed to limited routine testing by approved methods. Both broth microdilution (BMD) and colistin broth disc elution (CBDE) methods have been advocated, with limited data on the performance of these methods in the Indian settings. This prospective study was conducted to determine colistin resistance in P. aeruginosa, compare the BMD and CBDE methods with special reference to heteroresistance. MATERIALS AND METHODS A total of 100 isolates of P. aeruginosa from admitted patients were included. Antimicrobial susceptibility testing was done against standard antibiotics by disc diffusion test. Minimum inhibitory concentration (MIC) against polymyxins was studied by BMD and CBDE (for colistin only). Heteroresistance to colistin was studied by population analysis profile (PAP). CBDE and BMD were compared by performance calculations. Discrepancy in results were analyzed based on heteroresistance. RESULTS Majority of the P. aeruginosa isolates were from pus samples (62, 62 %). Disc diffusion method revealed maximum susceptibility towards aztreonam (74, 74 %) followed by meropenem (68, 68 %) and piperacillin-tazobactam (65, 65 %). Polymyxin B resistance was seen in 6 % (6) while colistin resistance was seen in 9 % (9) isolates by BMD. CBDE revealed 8 % (8) resistance to colistin, having 97 % essential agreement and 95 % categorical agreement with BMD. Further, by PAP analysis, 9 isolates were resistant to colistin which included 9 resistant isolates by BMD. On discrepancy analysis, 1 isolate was found to be heteroresistant to colistin. No heteroresistance was seen in the isolates that were susceptible by all the methods. CONCLUSIONS Heteroresistance to colistin in P. aeruginosa accounted for the discrepancy in results where CBDE method failed to detect heteroresistant isolate. As heteroresistance is a least studied phenotype, it's exact prevalence should be studied so that challenges in susceptibility testing could be addressed.
Collapse
Affiliation(s)
- Tuhina Banerjee
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India.
| | - Adwityama Adwityama
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India.
| | - Swati Sharma
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India.
| | - Kajal Mishra
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India.
| | - Prabha Prusti
- Department of Botany, Institute of Science, Banaras Hindu University, Varanasi, India.
| | - Upasona Maitra
- Department of Botany, Institute of Science, Banaras Hindu University, Varanasi, India.
| |
Collapse
|
2
|
Mirza Z, Walhout AJM, Ambros V. A bacterial pathogen induces developmental slowing by high reactive oxygen species and mitochondrial dysfunction in Caenorhabditis elegans. Cell Rep 2023; 42:113189. [PMID: 37801396 PMCID: PMC10929622 DOI: 10.1016/j.celrep.2023.113189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 07/19/2023] [Accepted: 09/14/2023] [Indexed: 10/08/2023] Open
Abstract
Host-pathogen interactions are complex by nature, and the host developmental stage increases this complexity. By utilizing Caenorhabditis elegans larvae as the host and the bacterium Pseudomonas aeruginosa as the pathogen, we investigated how a developing organism copes with pathogenic stress. By screening 36 P. aeruginosa isolates, we found that the CF18 strain causes a severe but reversible developmental delay via induction of reactive oxygen species (ROS) and mitochondrial dysfunction. While the larvae upregulate mitophagy, antimicrobial, and detoxification genes, mitochondrial unfolded protein response (UPRmt) genes are repressed. Either antioxidant or iron supplementation rescues the phenotypes. We examined the virulence factors of CF18 via transposon mutagenesis and RNA sequencing (RNA-seq). We found that non-phenazine toxins that are regulated by quorum sensing (QS) and the GacA/S system are responsible for developmental slowing. This study highlights the importance of ROS levels and mitochondrial health as determinants of developmental rate and how pathogens can attack these important features.
Collapse
Affiliation(s)
- Zeynep Mirza
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, MA 01605, USA
| | - Albertha J M Walhout
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, MA 01605, USA; Department of Systems Biology, University of Massachusetts Chan Medical School, Worcester, MA 01605, USA.
| | - Victor Ambros
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, MA 01605, USA.
| |
Collapse
|
3
|
Mosallam FM, Abbas HA, Shaker GH, Gomaa SE. Alleviating the virulence of Pseudomonas aeruginosa and Staphylococcus aureus by ascorbic acid nanoemulsion. Res Microbiol 2023; 174:104084. [PMID: 37247797 DOI: 10.1016/j.resmic.2023.104084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 05/31/2023]
Abstract
The high incidence of persistent multidrug resistant bacterial infections is a worldwide public health burden. Alternative strategies are required to deal with such issue including the use of drugs with anti-virulence activity. The application of nanotechnology to develop advanced Nano-materials that target quorum sensing regulated virulence factors is an attractive approach. Synthesis of ascorbic acid Nano-emulsion (ASC-NEs) and assessment of its activity in vitro against the virulence factors and its protective ability against pathogenesis as well as the effect against expression of quorum sensing genes of Pseudomonas aeruginosa and Staphylococcus aureus isolates. Ascorbic acid Nano-emulsion was characterized by DLS Zetasizer Technique, Zeta potential; Transmission Electron Microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). The antibacterial activity of ASC-NEs was tested by the broth microdilution method and the activity of their sub-MIC against the expression of quorum sensing controlled virulence was investigated using phenotypic experiments and RT-PCR. The protective activity of ASC-NEs against P. aeruginosa as well as S. aureus pathogenesis was tested in vivo. Phenotypically, ASC-NEs had strong virulence inhibitory activity against the tested bacteria. The RT-PCR experiment showed that it exhibited significant QS inhibitory activity. The in vivo results showed that ASC-NEs protected against staphylococcal infection, however, it failed to protect mice against Pseudomonal infection. These results suggest the promising use of nanoformulations against virulence factors in multidrug resistant P. aeruginosa and S. aureus. However, further studies are required concerning the potential toxicity, clearance and phamacokinetics of the nanoformulations.
Collapse
Affiliation(s)
- Farag M Mosallam
- Drug Microbiology Lab., Drug Radiation Research Department, Biotechnology Division, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority, Cairo, Egypt.
| | - Hisham A Abbas
- Department of Microbiology and Immunology-Faculty of Pharmacy-Zagazig University, Zagazig, Egypt
| | - Ghada H Shaker
- Department of Microbiology and Immunology-Faculty of Pharmacy-Zagazig University, Zagazig, Egypt
| | - Salwa E Gomaa
- Department of Microbiology and Immunology-Faculty of Pharmacy-Zagazig University, Zagazig, Egypt
| |
Collapse
|
4
|
Kostoulias X, Chang CC, Wisniewski J, Abbott IJ, Zisis H, Dennison A, Spelman DW, Peleg AY. Antimicrobial susceptibility of ceftolozane-tazobactam against multidrug-resistant Pseudomonas aeruginosa isolates from Melbourne, Australia. Pathology 2023:S0031-3025(23)00123-X. [PMID: 37336685 DOI: 10.1016/j.pathol.2023.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 03/06/2023] [Accepted: 03/20/2023] [Indexed: 06/21/2023]
Abstract
We collected 163 clinical Pseudomonas aeruginosa isolates at a tertiary hospital specialising in adult cystic fibrosis (CF) and lung transplantation (LTx) in Melbourne, Australia, to explore the activity of ceftolozane-tazobactam (C/T) in populations at high-risk for antimicrobial resistance. Of these, 144 (88.3%) were collected from sputum, and 19 (11.7%) from bronchoalveolar lavage. Most (85.3%) were derived from patients with cystic fibrosis and included a subset of patients that had undergone LTx. These isolates were tested against 11 antibiotics, including C/T, using Sensititre plates for broth microdilution (BMD) testing. Sixty (36.8%) isolates were classified as multidrug resistant (MDR) and 32 (19.6%) were extensively drug resistant (XDR). Overall, 133/163 (81.6%) isolates were susceptible to C/T. For MDR and XDR isolates, 88.3% and 28.1% were C/T susceptible, respectively. Among the non-MDR/XDR isolates, 100% remained susceptible to C/T. Comparisons of C/T susceptibility were made using BioMérieux Etests and Liofilchem MIC test strips (MTS). Categorical agreement to BMD was >93% for both test strips, but essential agreement to BMD was slightly higher with Etest (89.0%) compared to Liofilchem (74.8%). In conclusion, C/T retained activity against most MDR and over a quarter of XDR P. aeruginosa isolates from complex patients with CF and post-LTx.
Collapse
Affiliation(s)
- Xenia Kostoulias
- Department of Infectious Diseases, Alfred Health and Central Clinical School, Monash University, Prahran, Vic, Australia; Infection Program, Monash Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Vic, Australia; Microbiology Unit, The Alfred Hospital, Prahran, Vic, Australia
| | - Christina C Chang
- Department of Infectious Diseases, Alfred Health and Central Clinical School, Monash University, Prahran, Vic, Australia; Infection Program, Monash Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Vic, Australia
| | - Jessica Wisniewski
- Department of Infectious Diseases, Alfred Health and Central Clinical School, Monash University, Prahran, Vic, Australia
| | - Iain J Abbott
- Department of Infectious Diseases, Alfred Health and Central Clinical School, Monash University, Prahran, Vic, Australia; Centre to Impact AMR, Monash University, Clayton, Vic, Australia
| | - Helen Zisis
- Department of Infectious Diseases, Alfred Health and Central Clinical School, Monash University, Prahran, Vic, Australia
| | - Amanda Dennison
- Centre to Impact AMR, Monash University, Clayton, Vic, Australia
| | - Denis W Spelman
- Department of Infectious Diseases, Alfred Health and Central Clinical School, Monash University, Prahran, Vic, Australia; Centre to Impact AMR, Monash University, Clayton, Vic, Australia
| | - Anton Y Peleg
- Department of Infectious Diseases, Alfred Health and Central Clinical School, Monash University, Prahran, Vic, Australia; Infection Program, Monash Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Vic, Australia; Microbiology Unit, The Alfred Hospital, Prahran, Vic, Australia.
| |
Collapse
|
5
|
de Souza Nunes LH, Bernardi Lora JF, Fanhani Cracco LA, da Costa Manuel JA, Westarb Cruz JA, Telles JP, Tuon FF. Pseudomonas aeruginosa in tracheal aspirate: Colonization, infection, and recurrence. Clin Respir J 2023; 17:439-446. [PMID: 37105554 DOI: 10.1111/crj.13612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Revised: 03/17/2023] [Accepted: 03/26/2023] [Indexed: 04/29/2023]
Abstract
INTRODUCTION Pseudomonas aeruginosa respiratory infections are challenging, and the risk of recurrence is a frequent problem. The aim of this study was to investigate the risk factors associated with the presence of P. aeruginosa, and the risk factors related to the recurrence and death of lower airway infections in inpatients in a Brazilian hospital. METHODS Retrospective cohort with inpatients that had a sample of airways culture (tracheal aspirate or bronchoalveolar lavage) with the detection of P. aeruginosa. The patients with clinical criteria of infection were classified as ventilator-associated, hospital-acquired, or community-acquired pneumonia. P. aeruginosa in respiratory samples without symptoms was considered colonization. The antimicrobial treatment adequacy and the clinical data were evaluated. Outcome variables included mortality and recurrence. RESULTS One hundred and fifty-four patients were included in the study, most of them were men, and the majority (102) were considered infected. The average length of stay was superior to 30 days. Previous pulmonary disease was associated with the occurrence of colonization. Aminoglycosides were the most active drug according to susceptibility tests and were successfully used as monotherapy. Septic shock was a risk factor for death in the infected patients. The use of adequate antimicrobial therapy was associated with major survival, independent of the infection classification. CONCLUSION It is possible to evaluate clinical data associated with recurrence and mortality in patients with different lung infections by P. aeruginosa. Aminoglycoside monotherapy is safe and effective in P. aeruginosa respiratory infections.
Collapse
Affiliation(s)
- Larissa Hermann de Souza Nunes
- Laboratory of Emerging Infectious Diseases, School of Medicine, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, Brazil
| | - João Felipe Bernardi Lora
- Laboratory of Emerging Infectious Diseases, School of Medicine, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, Brazil
| | - Luiz Augusto Fanhani Cracco
- Laboratory of Emerging Infectious Diseases, School of Medicine, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, Brazil
| | | | | | - Joao Paulo Telles
- Laboratory of Emerging Infectious Diseases, School of Medicine, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, Brazil
| | - Felipe Francisco Tuon
- Laboratory of Emerging Infectious Diseases, School of Medicine, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, Brazil
| |
Collapse
|
6
|
Bajire SK, Ghate SD, Shetty S, Banerjee S, Rao RSP, Shetty V, Shastry RP. Unveiling the role of hub proteins in controlling quorum sensing regulated virulence through analogues in Pseudomonas aeruginosa PAO1: A functional protein-protein network biology approach. Biochem Biophys Res Commun 2023; 660:13-20. [PMID: 37058843 DOI: 10.1016/j.bbrc.2023.03.079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 03/24/2023] [Accepted: 03/30/2023] [Indexed: 04/16/2023]
Abstract
The protein-protein interaction (PPI) network analysis of specific genes identified for biofilm production and virulence/secretion system mediated by quorum sensing. The PPI depicted 13 hub proteins (namely rhlR, lasR, pscU, vfr, exsA, lasI, gacA, toxA, pilJ, pscC, fleQ, algR, and chpA) out of 160 nodes involving 627 edges. The PPI network analysis based on topographical features depicted pcrD with the highest degree value and vfr gene with the greatest betweenness centrality and closeness centrality (BC and CC) values. Based on in silico results, curcumin used as an Acyl homo-serine lactone (AHL) mimicker in P. aeruginosa, was also found effective in suppressing the quorum sensing regulated virulence factors such as elastase and pyocyanin. Based on in vitro experiment, curcumin suppressed biofilm formation at 62 μg/ml concentration. Host-pathogen interaction experiment showed that curcumin was also proved to be efficient in saving C. elegans from paralysis and killing effects of P. aeruginosa PAO1.
Collapse
Affiliation(s)
- Sukesh Kumar Bajire
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to Be University), University Road, Deralakatte, Mangaluru, 575018, India
| | - Sudeep D Ghate
- Center for Bioinformatics, NITTE (Deemed to Be University), Mangaluru, 575018, India; Central Research Laboratory, K.S. Hegde Medical Academy (KSHEMA), NITTE (Deemed to Be University), Mangaluru, 575018, India
| | - Shriya Shetty
- Central Research Laboratory, K.S. Hegde Medical Academy (KSHEMA), NITTE (Deemed to Be University), Mangaluru, 575018, India; Department of Microbiology, KS Hegde Medical Academy (KSHEMA), Nitte (Deemed to Be University), Deralakatte, Mangaluru, 575018, India
| | - Shukla Banerjee
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to Be University), University Road, Deralakatte, Mangaluru, 575018, India
| | - R Shyama Prasad Rao
- Center for Bioinformatics, NITTE (Deemed to Be University), Mangaluru, 575018, India; Central Research Laboratory, K.S. Hegde Medical Academy (KSHEMA), NITTE (Deemed to Be University), Mangaluru, 575018, India
| | - Veena Shetty
- Central Research Laboratory, K.S. Hegde Medical Academy (KSHEMA), NITTE (Deemed to Be University), Mangaluru, 575018, India; Department of Microbiology, KS Hegde Medical Academy (KSHEMA), Nitte (Deemed to Be University), Deralakatte, Mangaluru, 575018, India
| | - Rajesh P Shastry
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to Be University), University Road, Deralakatte, Mangaluru, 575018, India.
| |
Collapse
|
7
|
Wu N, Chen YA, Zhu Q, Son CH, Gu KZ, Zou CG, Wu QY, Ma YC. The EGL-30 pathway regulates experience-dependent aversive behavior of Caenorhabditis elegans to the pathogenic bacterium Pseudomonas aeruginosa. Biochem Biophys Res Commun 2023; 642:107-112. [PMID: 36566561 DOI: 10.1016/j.bbrc.2022.12.044] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022]
Abstract
Avoidance of harmful substances is survival strategy used cross invertebrates and vertebrates. For example, the nematode Caenorhabditis elegans evolves a sufficient avoidance response to pathogenic bacteria. Despite G protein has been found to exert neural plasticity for avoidance behaviours in C. elegans, the function of Gi/o and Gq subunit signalling in experience-dependent aversive behaviour remains unclear. In this study, we show that EGL-30/Gq coupled with EGL-8/UNC-13 regulates aversive behaviour of C. elegans to pathogenic bacterium Pseudomonas aeruginosa PA01 via acetylcholine and its receptor nAChR. Pyocyanin, a toxin secreted from P. aeruginosa, acts as a signal molecule to trigger aversive behaviour. ODR-3 and ODR-7 in AWA and AWC neurons function as upstream of EGL-30 to induce experience-dependent aversive behaviour to P. aeruginosa, respectively. These results suggested that a novel signalling pathway to regulate a behavioural response.
Collapse
Affiliation(s)
- Nan Wu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China
| | - Yu-An Chen
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China
| | - Qian Zhu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China
| | - Cai-Hua Son
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China
| | - Kun-Ze Gu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China
| | - Cheng-Gang Zou
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China
| | - Qin-Yi Wu
- Yunnan Provincial Key Laboratory of Molecular Biology for Sinomedicine, Yunnan University of Chinese Medicine, Kunming, 650500, Yunnan, China.
| | - Yi-Cheng Ma
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China.
| |
Collapse
|
8
|
Tang J, Guo R, Zhang X, Zhao X. Effect of Pseudomonas aeruginosa on corrosion of X65 pipeline steel. Heliyon 2022; 8:e12588. [PMID: 36643323 PMCID: PMC9834755 DOI: 10.1016/j.heliyon.2022.e12588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 10/30/2022] [Accepted: 12/15/2022] [Indexed: 12/25/2022] Open
Abstract
Microbiologically influenced corrosion (MIC) has caused great losses to many industries. This paper aimed to study the corrosion behavior of P. aeruginosa on X65 steel. The corrosion behavior of P. aeruginosa on X65 steel under aerobic and anaerobic conditions was studied by scanning electron microscopy, energy dispersive spectrometer and electrochemical analysis techniques. The results showed that the corrosion rate of X65 steel in bacterial environment is higher than that in sterile environment. In anaerobic environment, the corrosion of P. aeruginosa is mainly secreted acidic metabolites, and alkaline substances are corroded in aerobic environment. In general, the corrosion of X65 steel by P. aeruginosa in aerobic environment is more serious than that in anaerobic environment.
Collapse
Affiliation(s)
- Jianhua Tang
- CNOOC EnerTech-Equipment Technology Co., Ltd., Tianjin, 300452, China
| | - Ruiqi Guo
- School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China,Corresponding author.
| | - Xin Zhang
- School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China,Corresponding author.
| | - Xu Zhao
- Beijing TianyiShangjia High-tech Materials Co., Ltd., Beijing, 102400, China
| |
Collapse
|
9
|
Feizi S, Cooksley CM, Nepal R, Psaltis AJ, Wormald PJ, Vreugde S. Silver nanoparticles as a bioadjuvant of antibiotics against biofilm-mediated infections with methicillin-resistant Staphylococcus aureus and Pseudomonas aeruginosa in chronic rhinosinusitis patients. Pathology 2021; 54:453-459. [PMID: 34844745 DOI: 10.1016/j.pathol.2021.08.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 08/11/2021] [Accepted: 08/24/2021] [Indexed: 11/26/2022]
Abstract
Infectious diseases caused by antibiotic-resistant bacteria in planktonic and biofilm form are difficult to treat with conventional antibiotics. Silver nanoparticles (Ag NPs) can be used as alternatives to antibiotics and can alter the susceptibility of bacteria to antibiotics. Here, the antibacterial properties of 16 different antibiotics and Ag NPs, alone and in combination, were tested against clinical isolates of Pseudomonas aeruginosa (n=3), Staphylococcus aureus (n=3) and methicillin-resistant Staphylococcus aureus (MRSA) (n=2) isolated from chronic rhinosinusitis (CRS) patients. The microdilution method and resazurin assay were used to determine the minimum inhibitory concentration and minimum biofilm eradication concentration for planktonic and biofilm forms, respectively. Results showed that Ag NPs and gentamicin combinations had synergistic antibacterial activity against P. aeruginosa planktonic and biofilm forms and MRSA biofilms. Furthermore, additive effects against biofilms were seen for combinations of Ag NPs with tobramycin or ciprofloxacin against P. aeruginosa; with mupirocin against MRSA; and with augmentin, doxycycline, azithromycin and clindamycin against S. aureus. Moreover, additive effects against planktonic forms were observed for combinations of Ag NPs with tobramycin, ciprofloxacin, imipenem, ceftazidime and aztreonam against P. aeruginosa; with gentamicin or linezolid against MRSA; and with doxycycline or clindamycin against S. aureus. In conclusion, Ag NP-antibiotic combinations can result in enhanced antimicrobial action against P. aeruginosa, MRSA and S. aureus clinical isolates in planktonic and biofilm forms and can be used in the context of CRS with confirmed infection.
Collapse
Affiliation(s)
- Sholeh Feizi
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, SA, Australia; The University of Adelaide, Adelaide, SA, Australia
| | - Clare M Cooksley
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, SA, Australia; The University of Adelaide, Adelaide, SA, Australia
| | - Roshan Nepal
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, SA, Australia; The University of Adelaide, Adelaide, SA, Australia
| | - Alkis James Psaltis
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, SA, Australia; The University of Adelaide, Adelaide, SA, Australia
| | - Peter-John Wormald
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, SA, Australia; The University of Adelaide, Adelaide, SA, Australia
| | - Sarah Vreugde
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, SA, Australia; The University of Adelaide, Adelaide, SA, Australia.
| |
Collapse
|
10
|
Zheng M, Karki R, Kancharana B, Berns H, Pruett-Miller SM, Kanneganti TD. Caspase-6 promotes activation of the caspase-11-NLRP3 inflammasome during gram-negative bacterial infections. J Biol Chem 2021; 297:101379. [PMID: 34740613 PMCID: PMC8633687 DOI: 10.1016/j.jbc.2021.101379] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 10/15/2021] [Accepted: 10/21/2021] [Indexed: 12/18/2022] Open
Abstract
The innate immune system acts as the first line of defense against infection. One key component of the innate immune response to gram-negative bacterial infections is inflammasome activation. The caspase-11 (CASP11)-nucleotide-binding oligomerization domain-like receptor pyrin domain-containing 3 (NLRP3) inflammasome is activated by cytosolic lipopolysaccharide, a gram-negative bacterial cell wall component, to trigger pyroptosis and host defense during infection. Although several cellular signaling pathways have been shown to regulate CASP11-NLRP3 inflammasome activation in response to lipopolysaccharide, the upstream molecules regulating CASP11 activation during infection with live pathogens remain unclear. Here, we report that the understudied caspase-6 (CASP6) contributes to the activation of the CASP11-NLRP3 inflammasome in response to infections with gram-negative bacteria. Using in vitro cellular systems with bone marrow-derived macrophages and 293T cells, we found that CASP6 can directly process CASP11 by cleaving at Asp59 and Asp285, the CASP11 auto-cleavage sites, which could contribute to the activation of CASP11 during gram-negative bacterial infection. Thus, the loss of CASP6 led to impaired CASP11-NLRP3 inflammasome activation in response to gram-negative bacteria. These results demonstrate that CASP6 potentiates activation of the CASP11-NLRP3 inflammasome to produce inflammatory cytokines during gram-negative bacterial infections.
Collapse
Affiliation(s)
- Min Zheng
- Department of Immunology, St Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Rajendra Karki
- Department of Immunology, St Jude Children's Research Hospital, Memphis, Tennessee, USA
| | | | - Hartmut Berns
- Center for Advanced Genome Engineering, St Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Shondra M Pruett-Miller
- Center for Advanced Genome Engineering, St Jude Children's Research Hospital, Memphis, Tennessee, USA
| | | |
Collapse
|
11
|
Gazel D, Zer Y, Büyüktaş Manay A, Akdoğan H. Inhibition of swarming motility using in vitro hyperthermia. J Therm Biol 2021; 100:102955. [PMID: 34503816 DOI: 10.1016/j.jtherbio.2021.102955] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 04/03/2021] [Accepted: 04/03/2021] [Indexed: 11/16/2022]
Abstract
Hyperthermia is a therapeutic technique in which body tissue is exposed to temperatures in the region of 40-45 °C to induce a physiological or biological effect. Swarming motility is an important virulence factor for Proteus mirabilis and Pseudomonas aeruginosa and swarming phenomenon is a coordinated multicellular movement of differentiated bacterial population over semi-solid surfaces. In this study, we aimed to investigate the inhibitory effect of hyperthermia on bacterial swarming motility using a modified thermobiogram method and show the potential of this thermal method to treat bacterial infections. Ten P. mirabilis and 10 P. aeruginosa clinical isolates were included in the study. Sheep blood agar (SBA) plates were prepared and inoculated with bacterial suspensions of clinical isolates. Inoculated SBA plates were incubated inside 2 different incubators; at 37 °C and 45 °C for 20 h. The diameter of bacterial growing zones (swarming diameters) were measured every 2 h and noted. Finally, Gram stains of the isolates were prepared for microscopic examination. Wilcoxon signed-rank test was used to compare the swarming inhibition rates of the isolates incubated at 37 °C and 45 °C. Regarding P. mirabilis species, a significant difference was found between two different temperatures (P = 0.0078). So, a temperature at the level of hyperthermia significantly inhibited the swarming motility of P. mirabilis isolates. In addition, transformation to coccus form was observed at 45 °C. We speculate that these findings might be useful for employing thermal therapies including hyperthermia method to treat infectious diseases caused by swarming bacterial pathogens in the future.
Collapse
Affiliation(s)
- Deniz Gazel
- Department of Medical Microbiology, Gaziantep University, Faculty of Medicine, Gaziantep, Turkey.
| | - Yasemin Zer
- Department of Medical Microbiology, Gaziantep University, Faculty of Medicine, Gaziantep, Turkey.
| | - Ayşe Büyüktaş Manay
- Department of Medical Microbiology, Gaziantep University, Faculty of Medicine, Gaziantep, Turkey.
| | - Hüseyin Akdoğan
- Department of Medical Microbiology, Gaziantep University, Faculty of Medicine, Gaziantep, Turkey.
| |
Collapse
|
12
|
Berruti I, Oller I, Polo-López MI. Direct oxidation of peroxymonosulfate under natural solar radiation: Accelerating the simultaneous removal of organic contaminants and pathogens from water. Chemosphere 2021; 279:130555. [PMID: 34134404 DOI: 10.1016/j.chemosphere.2021.130555] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/08/2021] [Accepted: 04/09/2021] [Indexed: 06/12/2023]
Abstract
This study investigates the effectiveness of non-activated peroxymonosulfate (PMS) as oxidative agent for water purification in the presence and absence of natural solar radiation. The inactivation of three pathogens (Escherichia coli, Enterococcus faecalis and Pseudomonas aeruginosa) and degradation of three Contaminants of Emerging Concern (CECs) (Trimethoprim-TMP, Sulfamethoxazole-SMX and Diclofenac-DCF) was simultaneously assessed in isotonic water (IW) by testing a wide range of PMS concentrations (from 0.0001 to 0.01 mM). A significant oxidative effect of PMS in darkness was obtained for both bacteria and CEC abatement, but when irradiated with solar light, results demonstrated a great enhancement on all bacterial kinetic rates, reaching >5 Log reduction in 30 min (1.5 kJL-1 of QUV) with 0.005 mM of oxidant as the best concentration. For CECs, higher degradation performance was obtained with 0.01 mM, 80% removal of DCF, SMX and TMP was achieved in 16 min (1.5 kJL-1), 27 min (9.4 kJL-1) and 150 min (16.8 kJL-1), respectively. Besides, the influence of inorganic species on the global PMS/solar system performance was assessed by testing its effectiveness in distilled water (DW), natural well water (WeW) and diluted well water (d-WeW) at 0.01 mM. Results revealed that (i) high chloride concentration (IW) has an important positive effect, (ii) the presence of a complex inorganic chemical water composition reduced the system efficiency (WeW), and (iii) no differences were obtained from the presence of low or high contents of carbonates/bicarbonates (WeW versus d-WeW), obtaining the following global PMS/solar efficiency performance order: IW > DW > WeW = d-WeW.
Collapse
Affiliation(s)
- Ilaria Berruti
- CIEMAT-PSA, Carretera de Senés Km 4, 04200, Tabernas, Almería, Spain
| | - Isabel Oller
- CIEMAT-PSA, Carretera de Senés Km 4, 04200, Tabernas, Almería, Spain; CIESOL, Joint Centre of the University of Almería-CIEMAT, 04120, Almería, Spain
| | - María Inmaculada Polo-López
- CIEMAT-PSA, Carretera de Senés Km 4, 04200, Tabernas, Almería, Spain; CIESOL, Joint Centre of the University of Almería-CIEMAT, 04120, Almería, Spain.
| |
Collapse
|
13
|
Septama AW, Rahmi EP, Antika LD, Dewi RT, Jaisi A. A synergy interaction of artocarpin and tetracycline against Pseudomonas aeruginosa and its mechanism of action on membrane permeability. ACTA ACUST UNITED AC 2021; 77:57-63. [PMID: 34105319 DOI: 10.1515/znc-2021-0076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Accepted: 05/21/2021] [Indexed: 11/15/2022]
Abstract
The emergence of antibacterial resistance has significantly increased. Pseudomonas aeruginosa is associated with nosocomial infection and difficult to control. Artocarpin, a flavonoid from Artocarpus heterophyllus Lam. exhibits several pharmacological properties including antibacterial. The study was performed to evaluate interaction between artocarpin and antibiotics including tetracycline against P. aeruginosa. Its mechanism of action on membrane permeability was also investigated. Broth microdilution was conducted for the susceptibility assay. The interaction of artocarpin and antibiotics was evaluated using checkerboard method, the effect on alteration of membrane cell was investigated using bacteriolysis and the released of 260 nm materials. Artocarpin showed moderate to weak activity against the Gram-negative bacteria including P. aeruginosa with MIC values in the range of 31.25-250 μg/mL. A synergistic effect against P. aeruginosa was produced by the combination of artocarpin (31.25 μg/mL) and tetracycline (1.95 μg/mL) with FICI of 0.37. The time-killing assay showed that artocarpin enhance the antibacterial activity of tetracycline against P. aeruginosa by completely inhibiting the bacterial growth. Additionally, the mixture of artocarpin (31.25 μg/mL) and tetracycline (1.95 μg/mL) disrupted membrane permeability and lead to cell death. These results proposed that the combination of artocarpin and tetracycline may be used to overcome P. aeruginosa infection.
Collapse
Affiliation(s)
- Abdi Wira Septama
- Research Center for Chemistry, Indonesian Institute of Sciences, Kawasan PUSPIPTEK Serpong, Tangerang Selatan, Banten, 15314, Indonesia
| | - Eldiza Puji Rahmi
- Faculty of Medicine, UPN Veteran Jakarta, Jl. Rs. Fatmawati, Pondok Labu, Jakarta Selatan, 12450, Indonesia
| | - Lucia Dwi Antika
- Research Center for Chemistry, Indonesian Institute of Sciences, Kawasan PUSPIPTEK Serpong, Tangerang Selatan, Banten, 15314, Indonesia
| | - Rizna Triana Dewi
- Research Center for Chemistry, Indonesian Institute of Sciences, Kawasan PUSPIPTEK Serpong, Tangerang Selatan, Banten, 15314, Indonesia
| | - Amit Jaisi
- School of Pharmacy, Walailak University, Thasala, Nakhon Si Thammarat, 80160, Thailand
| |
Collapse
|
14
|
Gorbachevskii MV, Filatova SV, Filimonova AV, Kopitsyn DS, Panchenko AA, Vinokurov VA, Novikov AA. Detection of bacterial colonization by the spectral changes of surface-enhanced Raman reporters. Biochem Biophys Res Commun 2021; 546:145-149. [PMID: 33582557 DOI: 10.1016/j.bbrc.2021.01.099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 01/28/2021] [Indexed: 11/29/2022]
Abstract
In times of widespread multiple antibiotic resistance, the bacterial colonization of crucial medical surfaces should be detected as fast as possible. In this work, we present the non-destructive SERS method for the detection of bacterial colonization. SERS is an excellent tool for the monitoring of suitable substances in low concentrations. The SERS substrate was prepared by the aggregation of citrate-stabilized gold nanoparticles and the adsorption of the reporters (crystal violet, thiamine, and adenine). We have tested the substrate for the detection of clinically relevant S. aureus and P. aeruginosa bacteria. The SERS spectra before and after the substrate incubation revealed the degradation of the reporter by the growing bacteria. The growth of P. aeruginosa was detected using the substrates with preadsorbed crystal violet or adenine. The suitable reporter for the detection of S. aureus remains to be discovered. The selection of the reporters resistant to exposure but easily degraded by bacteria will open the way for the in situ monitoring of bacterial colonization, thus complementing the arsenal of methods in the battle against hospital infections.
Collapse
|
15
|
Halstead FD, Quick J, Niebel M, Garvey M, Cumley N, Smith R, Neal T, Roberts P, Hardy K, Shabir S, Walker JT, Hawkey P, Loman NJ. Pseudomonas aeruginosa infection in augmented care: the molecular ecology and transmission dynamics in four large UK hospitals. J Hosp Infect 2021; 111:162-168. [PMID: 33539934 DOI: 10.1016/j.jhin.2021.01.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/15/2021] [Accepted: 01/16/2021] [Indexed: 11/19/2022]
Abstract
BACKGROUND Pseudomonas aeruginosa is a common opportunistic pathogen and molecular typing in outbreaks has linked patient acquisition to contaminated hospital water systems. AIM To elucidate the role of P. aeruginosa transmission rates in non-outbreak augmented care settings in the UK. METHODS Over a 16-week period, all water outlets in augmented care units of four hospitals were sampled for P. aeruginosa and clinical isolates were collected. Outlet and clinical P. aeruginosa isolates underwent whole-genome sequencing (WGS), which with epidemiological data identified acquisition from water as definite (level 1), probable (level 2), possible (level 3), and no evidence (level 4). FINDINGS Outlets were positive in each hospital on all three occasions: W (16%), X (2.5%), Y (0.9%) and Z (2%); and there were 51 persistently positive outlets in total. WGS identified likely transmission (at levels 1, 2 and 3) from outlets to patients in three hospitals for P. aeruginosa positive patients: W (63%), X (54.5%) and Z (26%). According to the criteria (intimate epidemiological link and no phylogenetic distance), approximately 5% of patients in the study 'definitely' acquired their P. aeruginosa from their water outlets in the intensive care unit. This study found extensive evidence of transmission from the outlet to the patients particularly in the newest hospital (W), which had the highest rate of positive outlets. CONCLUSIONS The overall findings suggest that water outlets are the most likely source of P. aeruginosa nosocomial infections in some settings, and that widespread introduction of control measures would have a substantial impact on infections.
Collapse
Affiliation(s)
- F D Halstead
- NIHR Surgical Reconstruction and Microbiology Research Centre, Queen Elizabeth Hospital, Birmingham, UK; Department of Clinical Microbiology, Queen Elizabeth Hospital, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - J Quick
- NIHR Surgical Reconstruction and Microbiology Research Centre, Queen Elizabeth Hospital, Birmingham, UK; Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, UK
| | - M Niebel
- NIHR Surgical Reconstruction and Microbiology Research Centre, Queen Elizabeth Hospital, Birmingham, UK; Department of Clinical Microbiology, Queen Elizabeth Hospital, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - M Garvey
- NIHR Surgical Reconstruction and Microbiology Research Centre, Queen Elizabeth Hospital, Birmingham, UK; Department of Clinical Microbiology, Queen Elizabeth Hospital, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - N Cumley
- NIHR Surgical Reconstruction and Microbiology Research Centre, Queen Elizabeth Hospital, Birmingham, UK; Department of Clinical Microbiology, Queen Elizabeth Hospital, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - R Smith
- Royal Free London NHS Foundation Trust, Hampstead, London, UK
| | - T Neal
- Royal Liverpool University Hospital, Royal Liverpool and Broadgreen University Hospitals NHS Trust, Liverpool, UK
| | - P Roberts
- Royal Liverpool University Hospital, Royal Liverpool and Broadgreen University Hospitals NHS Trust, Liverpool, UK
| | - K Hardy
- Public Health England, Heartlands Hospital, University Hospitals Birmingham, Birmingham, UK
| | - S Shabir
- Public Health England, Heartlands Hospital, University Hospitals Birmingham, Birmingham, UK
| | | | - P Hawkey
- Department of Clinical Microbiology, Queen Elizabeth Hospital, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK; Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, UK.
| | - N J Loman
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, UK
| |
Collapse
|
16
|
Boye A, Addo JK, Acheampong DO, Thomford AK, Asante E, Amoaning RE, Kuma DN. The hydroxyl moiety on carbon one (C1) in the monoterpene nucleus of thymol is indispensable for anti-bacterial effect of thymol. Heliyon 2020; 6:e03492. [PMID: 32195386 PMCID: PMC7078539 DOI: 10.1016/j.heliyon.2020.e03492] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Revised: 02/05/2020] [Accepted: 02/21/2020] [Indexed: 12/15/2022] Open
Abstract
Background Thymol, a natural monoterpene phenol is not only relevant clinically as an anti-microbial, anti-oxidant and anti-inflammatory agent but also holds the prospect as a natural template for pharmaceutical semi-synthesis of therapeutic agents. It is a major component of essential oils from many plants. Evidence abound linking overall bioactivity of thymol to its monoterpene nucleus, specifically, the hydroxyl (-OH) substituent on carbon number one (C1) on the monoterpene nucleus. Other studies have posited that the overall bioactivity of thymol is not substantially altered by chemical modification of - OH on the C1 of the monoterpene nucleus. In view of this, it is still unclear as to whether removal or modification of the –OH on C1 of the monoterpene nucleus relates generally or context-dependently to bioactivity of thymol. Objective The present study investigated anti-bacterial effects of ester-and-ether substituted derivatives of thymol on S. aureus, P. aeruginosa and E. coli. Materials and methods twelve ester-and-ether substituted derivatives of thymol (6TM1s and 6TM2s) were synthesized and characterized by using HPLC, Mass spectrometry, and IR techniques. Anti-bacterial activity of the 12 thymol derivatives was evaluated using broth macrodilution and turbidimetric methods against pure clinical isolates (S. aureus, P. aeruginosa and E. coli). Standard anti-biotics used were Thymol Streptomycin and flucloxacillin, while DMSO was used as vehicle for thymol derivatives. MIC and MBC were determined. Results Thymol produced broad-spectrum growth inhibition on all isolates. At equimolar concentrations, thymol and reference drugs produced concentration-dependent growth inhibition against the isolates (Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli) compared to DMSO. Although the growth inhibitory effects of the ester-and-ether derivatives of thymol was significant (P ≤ 0.05) compared to DMSO, it was however insignificant (P ≥ 0.05) compared to thymol and reference antibiotics. Comparatively, at equimolar concentrations, ester-substituted derivatives of thymol, particularly the branched chain derivative (TM1C) produced more effective growth inhibition on the isolates than the ether-substituted derivatives of thymol. Thymol was twice as potent (MIC and MBC, 500 μg/ml) than both ester-and-ether substituted derivatives of thymol (MIC and MBC, > 1000 μg/ml) on all the three clinical isolates. Increase in side chain bulkiness of –OH moiety on the monoterpene nucleus of thymol decreased growth inhibition on isolates. Conclusion Thymol has demonstrated broad-spectrum anti-bacterial effects attributable to the hydroxyl moiety on C1 of the monoterpene nucleus. Structural modification of the hydroxyl moiety on C1 of the monoterpene nucleus of thymol with either ether-or-ester substitutions yielded no significant anti-bacterial effects.
Collapse
Affiliation(s)
- Alex Boye
- Department of Medical Laboratory Science, School of Allied Health Sciences, College of Health and Allied Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Justice Kwaku Addo
- Department of Chemistry, School of Physical Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Desmond Omane Acheampong
- Department of Biomedical Science, School of Allied Health Sciences, College of Health and Allied Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Ama Kyeraa Thomford
- Department of Biomedical Science, School of Allied Health Sciences, College of Health and Allied Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Emmanuel Asante
- Department of Medical Laboratory Science, School of Allied Health Sciences, College of Health and Allied Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Regina Elorm Amoaning
- Department of Medical Laboratory Science, School of Allied Health Sciences, College of Health and Allied Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Dominic Nkwantabisa Kuma
- Department of Biomedical Science, School of Allied Health Sciences, College of Health and Allied Sciences, University of Cape Coast, Cape Coast, Ghana
| |
Collapse
|
17
|
Thanabalasuriar A, Scott BNV, Peiseler M, Willson ME, Zeng Z, Warrener P, Keller AE, Surewaard BGJ, Dozier EA, Korhonen JT, Cheng LIT, Gadjeva M, Stover CK, DiGiandomenico A, Kubes P. Neutrophil Extracellular Traps Confine Pseudomonas aeruginosa Ocular Biofilms and Restrict Brain Invasion. Cell Host Microbe 2019; 25:526-536.e4. [PMID: 30930127 DOI: 10.1016/j.chom.2019.02.007] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2018] [Revised: 11/30/2018] [Accepted: 02/21/2019] [Indexed: 12/17/2022]
Abstract
Bacterial biofilm infections are difficult to eradicate because of antibiotic insusceptibility and high recurrence rates. Biofilm formation by Pseudomonas aeruginosa, a leading cause of bacterial keratitis, is facilitated by the bacterial Psl exopolysaccharide and associated with heightened virulence. Using intravital microscopy, we observed that neutrophilic recruitment to corneal infections limits P. aeruginosa biofilms to the outer eye surface, preventing bacterial dissemination. Neutrophils moved to the base of forming biofilms, where they underwent neutrophil extracellular trap formation (NETosis) in response to high expression of the bacterial type-3 secretion system (T3SS). NETs formed a barrier "dead zone," confining bacteria to the external corneal environment and inhibiting bacterial dissemination into the brain. Once formed, ocular biofilms were resistant to antibiotics and neutrophil killing, advancing eye pathology. However, blocking both Psl and T3SS together with antibiotic treatment broke down the biofilm and reversed keratitis, suggesting future therapeutic strategies for this intractable infection.
Collapse
Affiliation(s)
- Ajitha Thanabalasuriar
- University of Calgary, Department of Physiology and Pharmacology, Calvin Phoebe & Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, Calgary, AB, Canada; Microbial Sciences, MedImmune/AstraZeneca LLC, Gaithersburg, MD, USA
| | - Brittney Noelle Vivian Scott
- University of Calgary, Department of Physiology and Pharmacology, Calvin Phoebe & Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, Calgary, AB, Canada
| | - Moritz Peiseler
- University of Calgary, Department of Physiology and Pharmacology, Calvin Phoebe & Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, Calgary, AB, Canada
| | - Michelle Elizabeth Willson
- University of Calgary, Department of Physiology and Pharmacology, Calvin Phoebe & Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, Calgary, AB, Canada
| | - Zhutian Zeng
- University of Calgary, Department of Physiology and Pharmacology, Calvin Phoebe & Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, Calgary, AB, Canada
| | - Paul Warrener
- Microbial Sciences, MedImmune/AstraZeneca LLC, Gaithersburg, MD, USA
| | | | - Bas Gerardus Johannes Surewaard
- University of Calgary, Department of Physiology and Pharmacology, Calvin Phoebe & Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, Calgary, AB, Canada
| | | | - Juha Tapio Korhonen
- University of Calgary, Department of Physiology and Pharmacology, Calvin Phoebe & Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, Calgary, AB, Canada
| | - Lily I-Ting Cheng
- Microbial Sciences, MedImmune/AstraZeneca LLC, Gaithersburg, MD, USA
| | - Mihaela Gadjeva
- Department of Medicine, Division of Infectious Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - C Kendall Stover
- Microbial Sciences, MedImmune/AstraZeneca LLC, Gaithersburg, MD, USA
| | | | - Paul Kubes
- University of Calgary, Department of Physiology and Pharmacology, Calvin Phoebe & Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, Calgary, AB, Canada.
| |
Collapse
|
18
|
Sy SKB, Zhuang L, Xia H, Schuck VJ, Nichols WW, Derendorf H. A model-based analysis of pharmacokinetic-pharmacodynamic (PK/PD) indices of avibactam against Pseudomonas aeruginosa. Clin Microbiol Infect 2018; 25:904.e9-904.e16. [PMID: 30394361 DOI: 10.1016/j.cmi.2018.10.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 10/11/2018] [Accepted: 10/17/2018] [Indexed: 11/28/2022]
Abstract
OBJECTIVE The aim of the present work was to use a semi-mechanistic pharmacokinetic-pharmacodynamic (PK/PD) model developed from in vitro time-kill measurements with P. aeruginosa to compare different pharmacodynamic indices derived from simulated human avibactam exposures, with respect to their degree of correlation with the modelled bacterial responses. METHODS A mathematical model of the effect of ceftazidime-avibactam on the growth dynamics of P. aeruginosa was used to simulate bacterial responses to modelled human exposures from fractionated avibactam dosing regimens with a fixed ceftazidime dosing regimen (2 or 8 g q8h as a 2-h infusion). The relatedness of the 24-h change in bacterial density and avibactam exposure parameters was evaluated to determine exposure parameter that closely correlated with bacterial growth/killing responses. RESULTS Frequent dosing was associated with higher efficacy, resulting in a reduction of avibactam daily dose. The best-fit PD index of avibactam determined from the simulation was fT > CT of 1 mg/L avibactam and q8h was the longest dosing interval able to achieve 2-log kill: 41-87% (3.3 h to 7.0 h out of 8-h interval, respectively). The avibactam exposure magnitude required to achieve a 2-log kill in the simulations was dependent on the susceptibility of the bacterial isolate to ceftazidime. CONCLUSIONS Avibactam activity in combination with ceftazidime against multidrug resistant P. aeruginosa correlated with fT > CT. Setting a threshold avibactam concentration to 1 mg/L, superimposed over a simulated human-like exposure of ceftazidime, achieved at least 2-log kill for the clinical dose of 500 mg q8h avibactam as a 2-h infusion, depending on the minimum inhibitory concentration of ceftazidime alone.
Collapse
Affiliation(s)
- S K B Sy
- Department of Pharmaceutics, College of Pharmacy, University of Florida, Gainesville, FL, USA
| | - L Zhuang
- Department of Pharmaceutics, College of Pharmacy, University of Florida, Gainesville, FL, USA
| | - H Xia
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL, USA
| | | | | | - H Derendorf
- Department of Pharmaceutics, College of Pharmacy, University of Florida, Gainesville, FL, USA.
| |
Collapse
|
19
|
Schneider-Futschik EK, Paulin OKA, Hoyer D, Roberts KD, Ziogas J, Baker MA, Karas J, Li J, Velkov T. Sputum Active Polymyxin Lipopeptides: Activity against Cystic Fibrosis Pseudomonas aeruginosa Isolates and Their Interactions with Sputum Biomolecules. ACS Infect Dis 2018; 4:646-655. [PMID: 29566483 PMCID: PMC5952261 DOI: 10.1021/acsinfecdis.7b00238] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
![]()
The
mucoid biofilm mode of growth of Pseudomonas aeruginosa (P. aeruginosa) in the lungs of cystic fibrosis
patients makes eradication of infections with antibiotic therapy very
difficult. The lipopeptide antibiotics polymyxin B and colistin are
currently the last-resort therapies for infections caused by multidrug-resistant P. aeruginosa. In the present study, we investigated
the antibacterial activity of a series of polymyxin lipopeptides (polymyxin
B, colistin, FADDI-003, octapeptin A3, and polymyxin A2) against a panel of polymyxin-susceptible and polymyxin-resistant P. aeruginosa cystic fibrosis isolates grown under
planktonic or biofilm conditions in artificial sputum and their interactions
with sputum component biomolecules. In sputum media under planktonic
conditions, the lipopeptides FADDI-003 and octapeptin A3 displayed very promising activity against the polymyxin-resistant
isolate FADDI-PA066 (polymyxin B minimum inhibitory concentration
(MIC) = 32 mg/L), while retaining their activity against the polymyxin-sensitive
strains FADDI-PA021 (polymyxin B MIC = 1 mg/L) and FADDI-PA020 (polymyxin
B MIC = 2 mg/L). Polymyxin A2 was only effective against
the polymyxin-sensitive isolates. However, under biofilm growth conditions,
the hydrophobic lipopeptide FADDI-003 was inactive compared to the
more hydrophilic lipopeptides, octapeptin A3, polymyxin
A2, polymyxin B, and colistin. Transmission electron micrographs
revealed octapeptin A3 caused reduction in the cell numbers
in biofilm as well as biofilm disruption/“antibiofilm”
activity. We therefore assessed the interactions of the lipopeptides
with the component sputum biomolecules, mucin, deoxyribonucleic acid
(DNA), surfactant, F-actin, lipopolysaccharide, and phospholipids.
We observed the general trend that sputum biomolecules reduce lipopeptide
antibacterial activity. Collectively, our data suggests that, in the
airways, lipopeptide binding to component sputum biomolecules may
reduce antibacterial efficacy and is dependent on the physicochemical
properties of the lipopeptide.
Collapse
Affiliation(s)
- Elena K. Schneider-Futschik
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
- Department of Pharmacology and Therapeutics, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Olivia K. A. Paulin
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
| | - Daniel Hoyer
- Department of Pharmacology and Therapeutics, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, 30 Royal Parade, Parkville, Victoria 3052, Australia
- Department of Molecular Medicine, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
| | - Kade D. Roberts
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
| | - James Ziogas
- Department of Pharmacology and Therapeutics, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Mark A. Baker
- Priority Research Centre in Reproductive Science, School of Environmental and Life Sciences, University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - John Karas
- Department of Pharmacology and Therapeutics, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Jian Li
- Monash Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Tony Velkov
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
- Department of Pharmacology and Therapeutics, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| |
Collapse
|
20
|
Aharoni N, Mamane H, Biran D, Lakretz A, Ron EZ. Gene expression in Pseudomonas aeruginosa exposed to hydroxyl-radicals. Chemosphere 2018; 199:243-250. [PMID: 29448190 DOI: 10.1016/j.chemosphere.2018.02.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 12/23/2017] [Accepted: 02/03/2018] [Indexed: 06/08/2023]
Abstract
Recent studies have shown the efficiency of hydroxyl radicals generated via ultraviolet (UV)-based advanced oxidation processes (AOPs) combined with hydrogen peroxide (UV/H2O2) as a treatment process in water. The effects of AOP treatments on bacterial gene expression was examined using Pseudomonas aeruginosa strain PAO1 as a model-organism bacterium. Many bacterial genes are not expressed all the time, but their expression is regulated. The regulation is at the beginning of the gene, in a genetic region called "promoter" and affects the level of transcription (synthesis of messenger RNA) and translation (synthesis of protein). The level of expression of the regulated genes can change as a function of environmental conditions, and they can be expressed more (induced, upregulated) or less (downregulated). Exposure of strain PAO1 to UV/H2O2 treatment resulted in a major change in gene expression, including elevated expression of several genes. One interesting gene is PA3237, which was significantly upregulated under UV/H2O2 as compared to UV or H2O2 treatments alone. The induction of this gene is probably due to formation of radicals, as it is abolished in the presence of the radical scavenger tert-butanol (TBA) and is seen even when the bacteria are added after the treatment (post-treatment exposure). Upregulation of the PA3237 promoter could also be detected using a reporter gene, suggesting the use of such genetic constructs to develop biosensors for monitoring AOPs in water-treatment plants. Currently biosensors for AOPs do not exist, consequently impairing the ability to monitor these processes on-line according to radical exposure in natural waters.
Collapse
Affiliation(s)
- Noa Aharoni
- Porter School of Environmental Studies, Tel Aviv University, Tel Aviv 69978, Israel
| | - Hadas Mamane
- School of Mechanical Engineering, Environmental Engineering Program, Tel Aviv University, Tel Aviv 69978, Israel.
| | - Dvora Biran
- Department of Molecular Microbiology and Biotechnology, Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| | - Anat Lakretz
- School of Mechanical Engineering, Environmental Engineering Program, Tel Aviv University, Tel Aviv 69978, Israel; Department of Molecular Microbiology and Biotechnology, Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| | - Eliora Z Ron
- Department of Molecular Microbiology and Biotechnology, Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| |
Collapse
|
21
|
Ma YC, Zhang L, Dai LL, Khan RU, Zou CG. mir-67 regulates P. aeruginosa avoidance behavior in C. elegans. Biochem Biophys Res Commun 2017; 494:120-125. [PMID: 29050943 DOI: 10.1016/j.bbrc.2017.10.069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 10/14/2017] [Indexed: 01/27/2023]
Abstract
Pathogen avoidance behaviors are found throughout the animal kingdom and are important for animal's survival in nature. As a free-living nematode, C. elegans is exposed to a variety of microorganisms, including toxic or pathogenic bacteria, in soil. C. elegans can develop efficient avoidance responses to pathogenic bacteria to minimize the infection risk. However, the role of microRNAs (miRNAs) in pathogen avoidance in C. elegans remains unclear. In this report, we showed that the miRNA mir-67 was involved in a behavioral avoidance response to P. aeruginosa PA14. Exposure to P. aeruginosa PA14 induced the expression of mir-67 in worms. mir-67(n4899) mutants exhibited a reduced ability to avoid P. aeruginosa PA14. By combining quantitative proteomic analysis with miRNA target prediction algorithms, we identified SAX-7/L1CAM, which is transmembrane cell adhesion receptor molecule, as the target of mir-67. Silencing of sax-7 by RNAi on mir-67 mutants rescued avoidance behavioral. Our data demonstrate that the mir-67-SAX-7 pathway modulate the behavioral avoidance response to pathogens, thus providing a new perspective in the role of miRNAs in host-microbe interactions.
Collapse
Affiliation(s)
- Yi-Cheng Ma
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, Yunnan 650091, China
| | - Lu Zhang
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, Yunnan 650091, China
| | - Li-Li Dai
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, Yunnan 650091, China
| | - Rahat Ullah Khan
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, Yunnan 650091, China
| | - Cheng-Gang Zou
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, Yunnan 650091, China.
| |
Collapse
|
22
|
Singh PK, Yadav VK, Kalia M, Dohare S, Sharma D, Agarwal V. Pseudomonas aeruginosa auto inducer3-oxo-C 12-HSL exerts bacteriostatic effect and inhibits Staphylococcus epidermidis biofilm. Microb Pathog 2017; 110:612-619. [PMID: 28804019 DOI: 10.1016/j.micpath.2017.08.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Revised: 07/25/2017] [Accepted: 08/08/2017] [Indexed: 11/18/2022]
Abstract
Pseudomonas aeruginosa has evolved the 3-oxo-C12-HSL and C4-HSL based quorum sensing system which is responsible for the regulation of various virulence factors and helps to dominates over other bacterial species. Staphylococcus epidermidis has frequently been reported with P. aeruginosa while the role of C4-HSL and 3-oxo-C12-HSL on the S. epidermidis had widely been unexplored, and as per our knowledge, this is the first report on the impact of C4-HSL and 3-oxo-C12-HSL overS. epidermidis growth and biofilm. We found that among the two AHL molecules; only 3-oxo-C12-HSL was able to exert a significant effect in all the experiments including growth and biofilm of S. epidermidis. 3-oxo-C12-HSL at 100 μM and 200 μM concentrations were able to initiate the apparent transient type of planktonic growth inhibition in S. epidermidis. Microscopic analysis and biofilm quantification assay showed the inhibitory effect of 3-oxo-C12-HSL against S. epidermidis biofilm, initial attachment, and EPS production. The study concludes that P. aeruginosa associated 3-oxo-C12-HSL exerts the inhibitory effect on S. epidermidis growth and biofilms and thus it may also help Pseudomonasto dominate under the co-infection conditions.
Collapse
Affiliation(s)
- Pradeep Kumar Singh
- Department of Biotechnology, Motilal Nehru National Institute of Technology, Allahabad, India
| | - Vivek Kumar Yadav
- Department of Biotechnology, Motilal Nehru National Institute of Technology, Allahabad, India
| | - Manmohit Kalia
- Department of Biotechnology, Motilal Nehru National Institute of Technology, Allahabad, India
| | - Suhaga Dohare
- Department of Biotechnology, Motilal Nehru National Institute of Technology, Allahabad, India
| | - Deepmala Sharma
- Department of Mathematics, National Institute of Technology, Raipur, India
| | - Vishnu Agarwal
- Department of Biotechnology, Motilal Nehru National Institute of Technology, Allahabad, India.
| |
Collapse
|
23
|
Chen L, Peng Y, Tang M, Wu F. Comment on "Combination of cupric ion with hydroxylamine and hydrogen peroxide for the control of bacterial biofilms on RO membranes by Hye-Jin Lee, Hyung-Eun Kim, Changha Lee [Water Research 110, 2017, 83-90]". Water Res 2017; 118:289-290. [PMID: 28438312 DOI: 10.1016/j.watres.2017.04.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Accepted: 04/08/2017] [Indexed: 06/07/2023]
Abstract
The methodology employed by Lee et al. to terminate their bactericidal assays was found to be flawed via our demonstrations. Briefly, EDTA or sulfite combining with cupric ion did not fully terminate, and instead even boosted the P. aeruginosa death. We therefore suggested them to seek for other means of reaction termination, such as the combination of buffering agent PBS and Cu(II)-complexing agent EDTA.
Collapse
Affiliation(s)
- Long Chen
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA; School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, PR China
| | - Ying Peng
- Hubei Academy of Environmental Sciences, Wuhan, 430072, PR China
| | - Min Tang
- School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, PR China
| | - Feng Wu
- School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, PR China.
| |
Collapse
|
24
|
Valadbeigi H, Sadeghifard N, Salehi MB. Assessment of biofilm formation in Pseudomonas aeruginosa by antisense mazE-PNA. Microb Pathog 2017; 104:28-31. [PMID: 28062294 DOI: 10.1016/j.micpath.2017.01.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Revised: 12/28/2016] [Accepted: 01/02/2017] [Indexed: 01/22/2023]
Abstract
The hallmark patogenicity in Pseudomonas aeruginosa (P. aeruginosa) is biofilm formation that is not easy to eradicate, because it has variety mechanisms for antibiotic resistance. In addition, toxin-antitoxin (TA) system may play role in biofilm formation. The current study aimed to evaluate the role of TA loci in biofilm formation. Therefore, 18 P. aeruginosa clinical isolates were collected and evaluated for specific biofilm and TA genes. The analysis by RT-qPCR demonstrated that expression of mazE antitoxin in biofilm formation was increase. On the other hand, mazE antitoxin TA system was used as target for antisense PNA. mazE-PNA was able to influence in biofilm formation and was inhibit at 5,10 and 15 μM concentrations biofilm formation in P. aeruginosa. Therefore, it could be highlighted target for anti-biofilm target to eradicate P. aeruginosa biofilm producer.
Collapse
Affiliation(s)
- Hassan Valadbeigi
- Department of Microbiology, Science and Research Branch, Islamic Azad University, Fars, Iran; Department of Microbiology, Shiraz Branch, Islamic Azad University, Shiraz, Iran.
| | - Nourkhoda Sadeghifard
- Clinical Microbiology Research Center, Ilam University of Medical Sciences, Ilam, Iran.
| | - Majid Baseri Salehi
- Department of Microbiology, Kazeroun Branch, Islamic Azad University, Kazeroun, Iran.
| |
Collapse
|