1
|
Xu L, Wang H, Tong D, Xiang Z, Cao L, Wen X, Chen H, Xu J, Cui Y. Potential contamination at inhalation ports of air compressor-supplied ventilators. J Hosp Infect 2023; 142:130-131. [PMID: 37385453 DOI: 10.1016/j.jhin.2023.06.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 06/23/2023] [Accepted: 06/24/2023] [Indexed: 07/01/2023]
Affiliation(s)
- L Xu
- Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - H Wang
- Department of Respiratory and Critical Care Medicine, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - D Tong
- Hospital Infection Control Center, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Z Xiang
- Department of Laboratory Medicine, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - L Cao
- Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Department of Anesthesiology, Guilin Hospital of the Second Xiangya Hospital, Central South University, Guilin, Guangxi, China
| | - X Wen
- Department of Anesthesiology, Wenzhou People's Hospital, Wenzhou, Zhejiang, China
| | - H Chen
- Department of Clinical Microbiology Laboratory, Chenzhou No. 1 People's Hospital, Chenzhou, Hunan, China
| | - J Xu
- Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Y Cui
- Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China.
| |
Collapse
|
2
|
van den Berg D, Asker D, Awad TS, Lavielle N, Hatton BD. Mechanical deformation of elastomer medical devices can enable microbial surface colonization. Sci Rep 2023; 13:7691. [PMID: 37169828 PMCID: PMC10175502 DOI: 10.1038/s41598-023-34217-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 04/26/2023] [Indexed: 05/13/2023] Open
Abstract
Elastomers such as silicone are common in medical devices (catheters, prosthetic implants, endoscopes), but they remain prone to microbial colonization and biofilm infections. For the first time, our work shows that rates of microbial surface attachment to polydimethylsiloxane (PDMS) silicone can be significantly affected by mechanical deformation. For a section of bent commercial catheter tubing, bacteria (P. aeruginosa) show a strong preference for the 'convex' side compared to the 'concave' side, by a factor of 4.2. Further testing of cast PDMS materials in bending only showed a significant difference for samples that were manually wiped (damaged) beforehand (1.75 × 104 and 6.02 × 103 cells/mm2 on the convex and concave sides, respectively). We demonstrate that surface microcracks in elastomers are opened under tensile stress (convex bending) to become 'activated' as sites for microbial colonization. This work demonstrates that the high elastic limit of elastomers enables these microcracks to reversibly open and close, as 'dynamic defects'. Commercial catheters have relatively high surface roughness inherent to manufacturing, but we show that even manual wiping of newly-cast PDMS is sufficient to generate surface microcracks. We consider the implication for medical devices that feature sustained, surgical, or cyclic deformation, in which localized tensile conditions may expose these surface defects to opportunistic microbes. As a result, our work showcases serious potential problems in the widespread usage and development of elastomers in medical devices.
Collapse
Affiliation(s)
| | - Dalal Asker
- Department of Materials Science and Engineering, University of Toronto, Toronto, Canada
- Food Science & Technology Department, Alexandria University, Alexandria, Egypt
| | - Tarek S Awad
- Department of Materials Science and Engineering, University of Toronto, Toronto, Canada
| | - Nicolas Lavielle
- Physique et Mécanique des Milieux Hétérogènes, CNRS, ESPCI, PSL Research University, Sorbonne Université, Sorbonne Paris Cité, 75005, Paris, France
| | - Benjamin D Hatton
- Department of Materials Science and Engineering, University of Toronto, Toronto, Canada.
- Institute of Biomedical Engineering, University of Toronto, Toronto, Canada.
| |
Collapse
|
3
|
Asker D, Awad TS, Raju D, Sanchez H, Lacdao I, Gilbert S, Sivarajah P, Andes DR, Sheppard DC, Howell PL, Hatton BD. Preventing Pseudomonas aeruginosa Biofilms on Indwelling Catheters by Surface-Bound Enzymes. ACS APPLIED BIO MATERIALS 2021; 4:8248-8258. [PMID: 35005941 DOI: 10.1021/acsabm.1c00794] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Implanted medical devices such as central venous catheters are highly susceptible to microbial colonization and biofilm formation and are a major risk factor for nosocomial infections. The opportunistic pathogen Pseudomonas aeruginosa uses exopolysaccharides, such as Psl, for both initial surface attachment and biofilm formation. We have previously shown that chemically immobilizing the Psl-specific glycoside hydrolase, PslGh, to a material surface can inhibit P. aeruginosa biofilm formation. Herein, we show that PslGh can be uniformly immobilized on the lumen surface of medical-grade, commercial polyethylene, polyurethane, and polydimethylsiloxane (silicone) catheter tubing. We confirmed that the surface-bound PslGh was uniformly distributed along the catheter length and remained active even after storage for 30 days at 4 °C. P. aeruginosa colonization and biofilm formation under dynamic flow culture conditions in vitro showed a 3-log reduction in the number of bacteria during the first 11 days, and a 2-log reduction by day 14 for PslGh-modified PE-100 catheters, compared to untreated catheter controls. In an in vivo rat infection model, PslGh-modified PE-100 catheters showed a ∼1.5-log reduction in the colonization of the clinical P. aeruginosa ATCC 27853 strain after 24 h. These results demonstrate the robust ability of surface-bound glycoside hydrolase enzymes to inhibit biofilm formation and their potential to reduce rates of device-associated infections.
Collapse
Affiliation(s)
- Dalal Asker
- Department of Materials Science & Engineering, University of Toronto, Toronto M5S 3E4, Canada.,Food Science & Technology Department, Alexandria University, Alexandria 21526, Egypt
| | - Tarek S Awad
- Department of Materials Science & Engineering, University of Toronto, Toronto M5S 3E4, Canada
| | - Deepa Raju
- Program in Molecular Medicine, The Hospital for Sick Children, Toronto M5G 1X8, Canada
| | - Hiram Sanchez
- Department of Medicine, University of Wisconsin, 600 Highland Avenue, Madison 53706, Wisconsin, United States
| | - Ira Lacdao
- Program in Molecular Medicine, The Hospital for Sick Children, Toronto M5G 1X8, Canada
| | - Stephanie Gilbert
- Program in Molecular Medicine, The Hospital for Sick Children, Toronto M5G 1X8, Canada
| | - Piyanka Sivarajah
- Program in Molecular Medicine, The Hospital for Sick Children, Toronto M5G 1X8, Canada
| | - David R Andes
- Department of Medicine, University of Wisconsin, 600 Highland Avenue, Madison 53706, Wisconsin, United States.,Medical Microbiology and Immunology, University of Wisconsin, Madison 53706, Wisconsin, United States
| | - Donald C Sheppard
- Infectious Diseases and Immunity in Global Health Program, Research Institute of the McGill University Health Centre, Montréal H4A 3J1, Canada.,Department of Microbiology and Immunology, McGill University, Montreal H3A 0G4, Canada.,Department of Medicine, McGill University, Montreal H3A 0G4, Canada.,McGill Interdisciplinary Initiative in Infection and Immunity (MI4), Montreal H3A 0G4, Canada
| | - P Lynne Howell
- Program in Molecular Medicine, The Hospital for Sick Children, Toronto M5G 1X8, Canada.,Department of Biochemistry, University of Toronto, Toronto M5S 3E4, Canada
| | - Benjamin D Hatton
- Department of Materials Science & Engineering, University of Toronto, Toronto M5S 3E4, Canada
| |
Collapse
|
4
|
Sharma A, Kumar D, Dahiya K, Hawthorne S, Jha SK, Jha NK, Nand P, Girgis S, Raj S, Srivastava R, Goswami VK, Gregoriou Y, El-Zahaby SA, Ojha S, Dureja H, Gupta G, Singh S, Chellappan DK, Dua K. Advances in pulmonary drug delivery targeting microbial biofilms in respiratory diseases. Nanomedicine (Lond) 2021; 16:1905-1923. [PMID: 34348474 DOI: 10.2217/nnm-2021-0057] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The increasing burden of respiratory diseases caused by microbial infections poses an immense threat to global health. This review focuses on the various types of biofilms that affect the respiratory system and cause pulmonary infections, specifically bacterial biofilms. The article also sheds light on the current strategies employed for the treatment of such pulmonary infection-causing biofilms. The potential of nanocarriers as an effective treatment modality for pulmonary infections is discussed, along with the challenges faced during treatment and the measures that may be implemented to overcome these. Understanding the primary approaches of treatment against biofilm infection and applications of drug-delivery systems that employ nanoparticle-based approaches in the disruption of biofilms are of utmost interest which may guide scientists to explore the vistas of biofilm research while determining suitable treatment modalities for pulmonary respiratory infections.
Collapse
Affiliation(s)
- Ankur Sharma
- Department of Life Science, School of Basic Science & Research (SBSR), Sharda University, Greater Noida, 201310, India
| | - Dhruv Kumar
- Amity Institute of Molecular Medicine & Stem Cell Research (AIMMSCR), Amity University, Uttar Pradesh, Sec-125, Noida, 201313, India
| | - Kajal Dahiya
- Department of Life Science, School of Basic Science & Research (SBSR), Sharda University, Greater Noida, 201310, India
| | - Susan Hawthorne
- School of Pharmacy & Pharmaceutical Sciences, Ulster University, Cromore Road, Coleraine, Co. Londonderry, BT52 1SA, UK
| | - Saurabh Kumar Jha
- Department of Biotechnology, School of Engineering & Technology (SET), Sharda University, Greater Noida, 201310, India
| | - Niraj Kumar Jha
- Department of Biotechnology, School of Engineering & Technology (SET), Sharda University, Greater Noida, 201310, India
| | - Parma Nand
- Department of Biotechnology, School of Engineering & Technology (SET), Sharda University, Greater Noida, 201310, India
| | - Samuel Girgis
- School of Pharmacy, University of Sunderland, Chester Road, Sunderland, SR1 3SD, UK
| | - Sibi Raj
- Amity Institute of Molecular Medicine & Stem Cell Research (AIMMSCR), Amity University, Uttar Pradesh, Sec-125, Noida, 201313, India
| | - Rashi Srivastava
- Institute of Engineering & Technology, Lucknow, Uttar Pradesh, 226021, India
| | - Vineet Kumar Goswami
- Department of Biological Sciences, School of Basic & Applied Sciences, G.D. Goenka University, Education City, Sohna Road, Gurugram, Haryana, 122103, India
| | - Yiota Gregoriou
- Department of Biological Sciences, Faculty of Pure & Applied Sciences, University of Cyprus, Nicosia, Cyprus
| | - Sally A El-Zahaby
- Department of Pharmaceutics & Pharmaceutical Technology, Pharos University in Alexandria, Egypt
| | - Shreesh Ojha
- Department of Pharmacology & Therapeutics, College of Medicine & Health Sciences, PO Box-17666, United Arab Emirates University, Al Ain, UAE
| | - Harish Dureja
- Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak, Haryana, 124001, India
| | - Gaurav Gupta
- School of Pharmaceutical Sciences, Jaipur National University, Jagatpura, Jaipur, 302017, India
| | - Sachin Singh
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, 144001, India
| | - Dinesh Kumar Chellappan
- Department of Life Sciences, School of Pharmacy, International Medical University (IMU), Kuala Lumpur, 57000, Malaysia
| | - Kamal Dua
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, NSW, 2007, Australia
| |
Collapse
|
5
|
Sharma A, Kumar D, Dahiya K, Hawthorne S, Jha SK, Jha NK, Nand P, Girgis S, Raj S, Srivastava R, Goswami VK, Gregoriou Y, El-Zahaby SA, Ojha S, Dureja H, Gupta G, Singh S, Chellappan DK, Dua K. Advances in pulmonary drug delivery targeting microbial biofilms in respiratory diseases. Nanomedicine (Lond) 2021. [DOI: https://doi.org/10.2217/nnm-2021-0057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The increasing burden of respiratory diseases caused by microbial infections poses an immense threat to global health. This review focuses on the various types of biofilms that affect the respiratory system and cause pulmonary infections, specifically bacterial biofilms. The article also sheds light on the current strategies employed for the treatment of such pulmonary infection-causing biofilms. The potential of nanocarriers as an effective treatment modality for pulmonary infections is discussed, along with the challenges faced during treatment and the measures that may be implemented to overcome these. Understanding the primary approaches of treatment against biofilm infection and applications of drug-delivery systems that employ nanoparticle-based approaches in the disruption of biofilms are of utmost interest which may guide scientists to explore the vistas of biofilm research while determining suitable treatment modalities for pulmonary respiratory infections.
Collapse
Affiliation(s)
- Ankur Sharma
- Department of Life Science, School of Basic Science & Research (SBSR), Sharda University, Greater Noida, 201310, India
| | - Dhruv Kumar
- Amity Institute of Molecular Medicine & Stem Cell Research (AIMMSCR), Amity University, Uttar Pradesh, Sec-125, Noida, 201313, India
| | - Kajal Dahiya
- Department of Life Science, School of Basic Science & Research (SBSR), Sharda University, Greater Noida, 201310, India
| | - Susan Hawthorne
- School of Pharmacy & Pharmaceutical Sciences, Ulster University, Cromore Road, Coleraine, Co. Londonderry, BT52 1SA, UK
| | - Saurabh Kumar Jha
- Department of Biotechnology, School of Engineering & Technology (SET), Sharda University, Greater Noida, 201310, India
| | - Niraj Kumar Jha
- Department of Biotechnology, School of Engineering & Technology (SET), Sharda University, Greater Noida, 201310, India
| | - Parma Nand
- Department of Biotechnology, School of Engineering & Technology (SET), Sharda University, Greater Noida, 201310, India
| | - Samuel Girgis
- School of Pharmacy, University of Sunderland, Chester Road, Sunderland, SR1 3SD, UK
| | - Sibi Raj
- Amity Institute of Molecular Medicine & Stem Cell Research (AIMMSCR), Amity University, Uttar Pradesh, Sec-125, Noida, 201313, India
| | - Rashi Srivastava
- Institute of Engineering & Technology, Lucknow, Uttar Pradesh, 226021, India
| | - Vineet Kumar Goswami
- Department of Biological Sciences, School of Basic & Applied Sciences, G.D. Goenka University, Education City, Sohna Road, Gurugram, Haryana, 122103, India
| | - Yiota Gregoriou
- Department of Biological Sciences, Faculty of Pure & Applied Sciences, University of Cyprus, Nicosia, Cyprus
| | - Sally A El-Zahaby
- Department of Pharmaceutics & Pharmaceutical Technology, Pharos University in Alexandria, Egypt
| | - Shreesh Ojha
- Department of Pharmacology & Therapeutics, College of Medicine & Health Sciences, PO Box-17666, United Arab Emirates University, Al Ain, UAE
| | - Harish Dureja
- Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak, Haryana, 124001, India
| | - Gaurav Gupta
- School of Pharmaceutical Sciences, Jaipur National University, Jagatpura, Jaipur, 302017, India
| | - Sachin Singh
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, 144001, India
| | - Dinesh Kumar Chellappan
- Department of Life Sciences, School of Pharmacy, International Medical University (IMU), Kuala Lumpur, 57000, Malaysia
| | - Kamal Dua
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, NSW, 2007, Australia
| |
Collapse
|
6
|
Targhi AA, Moammeri A, Jamshidifar E, Abbaspour K, Sadeghi S, Lamakani L, Akbarzadeh I. Synergistic effect of curcumin-Cu and curcumin-Ag nanoparticle loaded niosome: Enhanced antibacterial and anti-biofilm activities. Bioorg Chem 2021; 115:105116. [PMID: 34333420 DOI: 10.1016/j.bioorg.2021.105116] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 06/16/2021] [Accepted: 06/19/2021] [Indexed: 12/11/2022]
Abstract
In the current study, for the first time, the synergistic activity of curcumin and silver/copper nanoparticles (NPs) was studied against Staphylococcus aureus and Pseudomonas aeruginosa. Moreover, a unique combination of curcumin and silver/copper NPs in free and encapsulated forms was prepared and delivered through a niosomal system. For this purpose, different niosomal formulations of curcumin and metal NPs were prepared by thin film hydration method. Then, the dual drug-loaded niosomes were dispersed in chitosan hydrogel in order to widen its applications. The effect of the molar ratios of lipid to drug and surfactant to cholesterol was investigated to find the optimized noisomal nanoparticles in terms of size, polydispersity index (PDI), and entrapment efficiency (EE). The size and PDI values were measured by dynamic light scattering (DLS). Morphology and in vitro drug release kinetics of niosomes were examined by scanning and transmission electron microscopy (SEM, TEM) and dialysis method, respectively. The drug-loaded niosomes and their hydrogel counterpart were screened for investigating their antibacterial activity against S. aureus and P. aeruginosa by disk diffusion, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) assays. Furthermore, anti-biofilm assay and expression of biofilm-associated genes by Real-time PCR were performed to evaluate the anti-biofilm effect of NPs. In this study, the drug-loaded niosomal formulations showed good entrapment efficiencies (EE) with a sustained release profile over 72 h. Moreover, compared to free drugs, the optimized niosomal formulations increased antibacterial activity against the bacteria via promotion in the inhibition zone and reduction in MIC and MBC values. Interestingly, gel-based niosomal formulations increased the inhibition zone by about 6 mm and significantly decreased MIC and MBC values compared to niosomal formulations. Also, biofilm eradication of curcumin-metal NPs encapsulated into niosomal hydrogel was highest compared to free and niosomal drugs. Overall, curcumin-Cu or curcumin-Ag nanoparticle loaded niosomes incorporated in hydrogel hold great promise for biomedical applications.
Collapse
Affiliation(s)
| | - Ali Moammeri
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Elham Jamshidifar
- Department of Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Koorosh Abbaspour
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Somayeh Sadeghi
- Department of Molecular Biology, Pasteur Institute of Iran, Tehran, Iran.
| | - Lida Lamakani
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Iman Akbarzadeh
- Department of Chemical and Petrochemical Engineering, Sharif University of Technology, Tehran, Iran.
| |
Collapse
|
7
|
Zhao J, Li LQ, Chen CY, Zhang GS, Cui W, Tian BP. Do probiotics help prevent ventilator-associated pneumonia in critically ill patients? A systematic review with meta-analysis. ERJ Open Res 2021; 7:00302-2020. [PMID: 33532460 PMCID: PMC7836470 DOI: 10.1183/23120541.00302-2020] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 09/28/2020] [Indexed: 12/18/2022] Open
Abstract
Background Probiotic treatments might contribute to the prevention of ventilator-associated pneumonia (VAP). Due to its unclear clinical effects, here we intend to assess the preventive effect and safety of probiotics on intensive care unit (ICU) patients. Methods Eligible randomised controlled trials were selected in databases until 30 September 2019. The characteristics of the studies were extracted, including study design, definition of VAP, probiotics intervention, category of included patients, incidence of VAP, mortality, duration of mechanical ventilation (MV) and ICU stay. Heterogeneity was evaluated by Chi-squared and I2 tests. Results 15 studies involving 2039 patients were identified for analysis. The pooled analysis suggests significant reduction on VAP (risk ratio, 0.68; 95% Cl, 0.60 to 0.77; p<0.00001) in a fixed-effects model. Subgroup analyses performed on the category of clinical and microbiological criteria both support the above conclusion; however, there were no significant differences in duration of MV or length of ICU stay in a random-effects model. Also, no significant differences in total mortality, overall mortality, 28-day mortality or 90-day mortality were found in the fixed-effects model. Conclusions The probiotics helped to prevent VAP without impacting the duration of MV, length of ICU stay or mortality.
Collapse
Affiliation(s)
- Jie Zhao
- Dept of Critical Care Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310009, China
| | - Lei-Qing Li
- Dept of Critical Care Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310009, China
| | - Cheng-Yang Chen
- Dept of Critical Care Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310009, China
| | - Gen-Sheng Zhang
- Dept of Critical Care Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310009, China
| | - Wei Cui
- Dept of Critical Care Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310009, China
| | - Bao-Ping Tian
- Dept of Critical Care Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310009, China
| |
Collapse
|
8
|
Kushwaha M, Jain SK, Sharma N, Abrol V, Jaglan S, Vishwakarma RA. Establishment of LCMS Based Platform for Discovery of Quorum Sensing Inhibitors: Signal Detection in Pseudomonas aeruginosa PAO1. ACS Chem Biol 2018; 13:657-665. [PMID: 29303546 DOI: 10.1021/acschembio.7b00875] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Targeting the main three networking systems, viz. Las, RhI, and PQS, via natural quenchers is a new ray of hope for combating the persistent behavior of Pseudomonas aeruginosa. In the bacterial chemical vocabulary pyocyanin, N-AHLs and rhamnolipids are the main keywords, which are responsible for the social and nomadic behavior of P. aeruginosa. In the present work, LC-MS based real-time qualitative and quantitative analysis of pyocyanin, green phenazine, N-AHLs, and rhamnolipids were performed on P. aeruginosa PAO1. The quantitative analysis indicates that the production of pyocyanin and NHSLs increases with time while the production of rhamnolipids discontinued after 16 h. This indicates the emergence of persisters in the medium instead of planktonic cells. Rhamnolipids acting as a surfactant enhances the motility of the bacterial cells, whereas the pyocyanin is responsible for the biofilm formation. In a microtiter plate based assay, an effect of capsaicin and 6-gingerol was recorded. In the presence of capsaicin and 6-gingerol, a substantial decrease in the production of rhamnolipids, phenazine, quinolone, and N-AHLs was observed. Most interestingly, the 6-gingerol treatment led to a drastic decrease of rhamnolipids, phenazine, quinolone, and N-AHLs versus capsaicin. These studies demonstrate the effectiveness of the capsaicin and 6-gingerol on Las, PQS, and Rhl circuits in a bacterium in order to understand the persistent and social behavior. Here, we are reporting LC-MS/MS based qualitative and quantitative analysis of QS molecules by taking a low volume of culture (up to 200 μL). This method can be used as a platform to screen the new antivirulence agents for fighting the resistant behavior of P. aeruginosa during biofilm formation.
Collapse
Affiliation(s)
- Manoj Kushwaha
- Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
- Department of Biotechnology, Guru Nanak Dev University, Amritsar-143001, Punjab, India
| | - Shreyans K. Jain
- Natural Product Chemistry Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
| | - Nisha Sharma
- Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
- Academy of Scientific and Innovative Research, Jammu Campus, Jammu-180001, India
| | - Vidushi Abrol
- Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
| | - Sundeep Jaglan
- Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
- Academy of Scientific and Innovative Research, Jammu Campus, Jammu-180001, India
| | - Ram A. Vishwakarma
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
| |
Collapse
|
9
|
Caratto V, Ball L, Sanguineti E, Insorsi A, Firpo I, Alberti S, Ferretti M, Pelosi P. Antibacterial activity of standard and N-doped titanium dioxide-coated endotracheal tubes: an in vitro study. Rev Bras Ter Intensiva 2018; 29:55-62. [PMID: 28444073 PMCID: PMC5385986 DOI: 10.5935/0103-507x.20170009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 01/09/2017] [Indexed: 11/28/2022] Open
Abstract
Objective The aim of this study was to assess the antibacterial activity against
Staphylococcus aureus and Pseudomonas
aeruginosa of two nanoparticle endotracheal tube coatings with
visible light-induced photocatalysis. Methods Two types of titanium dioxide nanoparticles were tested: standard anatase
(TiO2) and N-doped TiO2 (N-TiO2).
Nanoparticles were placed on the internal surface of a segment of commercial
endotracheal tubes, which were loaded on a cellulose acetate filter; control
endotracheal tubes were left without a nanoparticle coating. A bacterial
inoculum of 150 colony forming units was placed in the endotracheal tubes
and then exposed to a fluorescent light source (3700 lux, 300-700 nm
wavelength) for 5, 10, 20, 40, 60 and 80 minutes. Colony forming units were
counted after 24 hours of incubation at 37°C. Bacterial inactivation was
calculated as the percentage reduction of bacterial growth compared to
endotracheal tubes not exposed to light. Results In the absence of light, no relevant antibacterial activity was shown against
neither strain. For P. aeruginosa, both coatings had a
higher bacterial inactivation than controls at any time point (p <
0.001), and no difference was observed between TiO2 and
N-TiO2. For S. aureus, inactivation was
higher than for controls starting at 5 minutes for N-TiO2 (p =
0.018) and 10 minutes for TiO2 (p = 0.014); inactivation with
N-TiO2 was higher than that with TiO2 at 20
minutes (p < 0.001), 40 minutes (p < 0.001) and 60 minutes (p <
0.001). Conclusions Nanosized commercial and N-doped TiO2 inhibit bacterial growth
under visible fluorescent light. N-TiO2 has higher antibacterial
activity against S. aureus compared to TiO2.
Collapse
Affiliation(s)
- Valentina Caratto
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, Genova, Italy.,Istituto CNR SPIN - Genova, Italy
| | - Lorenzo Ball
- Dipartimento di Scienze Chirurgiche e Diagnostiche Integrate, Università degli Studi di Genova, Genova, Italy
| | - Elisa Sanguineti
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, Genova, Italy.,Istituto CNR SPIN - Genova, Italy.,Dipartimento di Scienze della Terra, dell'Ambiente e della Vita, Università degli Studi di Genova, Genova, Italy
| | - Angelo Insorsi
- Dipartimento di Scienze Chirurgiche e Diagnostiche Integrate, Università degli Studi di Genova, Genova, Italy
| | - Iacopo Firpo
- Dipartimento di Scienze Chirurgiche e Diagnostiche Integrate, Università degli Studi di Genova, Genova, Italy
| | - Stefano Alberti
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, Genova, Italy
| | - Maurizio Ferretti
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, Genova, Italy.,Istituto CNR SPIN - Genova, Italy
| | - Paolo Pelosi
- Dipartimento di Scienze Chirurgiche e Diagnostiche Integrate, Università degli Studi di Genova, Genova, Italy
| |
Collapse
|
10
|
Antonelli A, Di Maggio S, Rejman J, Sanvito F, Rossi A, Catucci A, Gorzanelli A, Bragonzi A, Bianchi ME, Raucci A. The shedding-derived soluble receptor for advanced glycation endproducts sustains inflammation during acute Pseudomonas aeruginosa lung infection. Biochim Biophys Acta Gen Subj 2017; 1861:354-364. [DOI: 10.1016/j.bbagen.2016.11.040] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 11/22/2016] [Accepted: 11/28/2016] [Indexed: 01/07/2023]
|
11
|
Whether a novel drug delivery system can overcome the problem of biofilms in respiratory diseases? Drug Deliv Transl Res 2016; 7:179-187. [DOI: 10.1007/s13346-016-0349-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
12
|
Discovery of cahuitamycins as biofilm inhibitors derived from a convergent biosynthetic pathway. Nat Commun 2016; 7:10710. [PMID: 26880271 PMCID: PMC4757757 DOI: 10.1038/ncomms10710] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 01/11/2016] [Indexed: 02/03/2023] Open
Abstract
Pathogenic microorganisms often have the ability to attach to a surface, building a complex matrix where they colonize to form a biofilm. This cellular superstructure can display increased resistance to antibiotics and cause serious, persistent health problems in humans. Here we describe a high-throughput in vitro screen to identify inhibitors of Acinetobacter baumannii biofilms using a library of natural product extracts derived from marine microbes. Analysis of extracts derived from Streptomyces gandocaensis results in the discovery of three peptidic metabolites (cahuitamycins A-C), with cahuitamycin C being the most effective inhibitor (IC50=14.5 μM). Biosynthesis of cahuitamycin C proceeds via a convergent biosynthetic pathway, with one of the steps apparently being catalysed by an unlinked gene encoding a 6-methylsalicylate synthase. Efforts to assess starter unit diversification through selective mutasynthesis lead to production of unnatural analogues cahuitamycins D and E of increased potency (IC50=8.4 and 10.5 μM).
Collapse
|