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Ucuncu M, Mills B, Duncan S, Staderini M, Dhaliwal K, Bradley M. Polymyxin-based photosensitizer for the potent and selective killing of Gram-negative bacteria. Chem Commun (Camb) 2020; 56:3757-3760. [DOI: 10.1039/d0cc00155d] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The methylene blue-polymyxin conjugate demonstrated high selectivity, sensitivity and phototoxicity against Gram-negative bacteria, including in early biofilm models.
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Affiliation(s)
- Muhammed Ucuncu
- School of Chemistry and the EPSRC IRC Proteus
- University of Edinburgh
- Joseph Black Building
- David Brewster Road
- Edinburgh
| | - Bethany Mills
- EPSRC Proteus Hub
- Centre of Inflammation Research
- Queen's Medical Research Institute
- University of Edinburgh
- 47 Little France Crescent
| | - Sheelagh Duncan
- EPSRC Proteus Hub
- Centre of Inflammation Research
- Queen's Medical Research Institute
- University of Edinburgh
- 47 Little France Crescent
| | - Matteo Staderini
- School of Chemistry and the EPSRC IRC Proteus
- University of Edinburgh
- Joseph Black Building
- David Brewster Road
- Edinburgh
| | - Kevin Dhaliwal
- EPSRC Proteus Hub
- Centre of Inflammation Research
- Queen's Medical Research Institute
- University of Edinburgh
- 47 Little France Crescent
| | - Mark Bradley
- School of Chemistry and the EPSRC IRC Proteus
- University of Edinburgh
- Joseph Black Building
- David Brewster Road
- Edinburgh
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Lesur O, Chagnon F, Lebel R, Lepage M. In Vivo Endomicroscopy of Lung Injury and Repair in ARDS: Potential Added Value to Current Imaging. J Clin Med 2019; 8:jcm8081197. [PMID: 31405200 PMCID: PMC6723156 DOI: 10.3390/jcm8081197] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 08/06/2019] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Standard clinical imaging of the acute respiratory distress syndrome (ARDS) lung lacks resolution and offers limited possibilities in the exploration of the structure-function relationship, and therefore cannot provide an early and clear discrimination of patients with unexpected diagnosis and unrepair profile. The current gold standard is open lung biopsy (OLB). However, despite being able to reveal precise information about the tissue collected, OLB cannot provide real-time information on treatment response and is accompanied with a complication risk rate up to 25%, making longitudinal monitoring a dangerous endeavor. Intravital probe-based confocal laser endomicroscopy (pCLE) is a developing and innovative high-resolution imaging technology. pCLE offers the possibility to leverage multiple and specific imaging probes to enable multiplex screening of several proteases and pathogenic microorganisms, simultaneously and longitudinally, in the lung. This bedside method will ultimately enable physicians to rapidly, noninvasively, and accurately diagnose degrading lung and/or fibrosis without the need of OLBs. OBJECTIVES AND METHODS To extend the information provided by standard imaging of the ARDS lung with a bedside, high-resolution, miniaturized pCLE through the detailed molecular imaging of a carefully selected region-of-interest (ROI). To validate and quantify real-time imaging to validate pCLE against OLB. RESULTS Developments in lung pCLE using fluorescent affinity- or activity-based probes at both preclinical and clinical (first-in-man) stages are ongoing-the results are promising, revealing correlations with OLBs in problematic ARDS. CONCLUSION It can be envisaged that safe, high-resolution, noninvasive pCLE with activatable fluorescence probes will provide a "virtual optical biopsy" and will provide decisive information in selected ARDS patients at the bedside.
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Affiliation(s)
- Olivier Lesur
- Intensive Care and Pneumology Departments, Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, QC J1H 5N4, Canada.
- Sherbrooke Molecular Imaging Center (CIMS), Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, QC J1H 5N4, Canada.
| | - Frédéric Chagnon
- Intensive Care and Pneumology Departments, Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, QC J1H 5N4, Canada
| | - Réjean Lebel
- Sherbrooke Molecular Imaging Center (CIMS), Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, QC J1H 5N4, Canada
- Nuclear Medicine and Radiobiology Departments, Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, QC J1H 5N4, Canada
| | - Martin Lepage
- Sherbrooke Molecular Imaging Center (CIMS), Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, QC J1H 5N4, Canada
- Nuclear Medicine and Radiobiology Departments, Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, QC J1H 5N4, Canada
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Akram AR, Avlonitis N, Scholefield E, Vendrell M, McDonald N, Aslam T, Craven TH, Gray C, Collie DS, Fisher AJ, Corris PA, Walsh T, Haslett C, Bradley M, Dhaliwal K. Enhanced avidity from a multivalent fluorescent antimicrobial peptide enables pathogen detection in a human lung model. Sci Rep 2019; 9:8422. [PMID: 31182770 PMCID: PMC6557859 DOI: 10.1038/s41598-019-44804-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 05/20/2019] [Indexed: 12/19/2022] Open
Abstract
Rapid in situ detection of pathogens coupled with high resolution imaging in the distal human lung has the potential to provide new insights and diagnostic utility in patients in whom pneumonia is suspected. We have previously described an antimicrobial peptide (AMP) Ubiquicidin (fragment UBI29-41) labelled with an environmentally sensitive fluorophore that optically detected bacteria in vitro but not ex vivo. Here, we describe further chemical development of this compound and demonstrate that altering the secondary structure of the AMP to generate a tri-branched dendrimeric scaffold provides enhanced signal in vitro and ex vivo and consequently allows the rapid detection of pathogens in situ in an explanted human lung. This compound (NBD-UBIdend) demonstrates bacterial labelling specificity for a broad panel of pathogenic bacteria and Aspergillus fumigatus. NBD-UBIdend demonstrated high signal-to-noise fluorescence amplification upon target engagement, did not label host mammalian cells and was non-toxic and chemically robust within the inflamed biological environment. Intrapulmonary delivery of NBD-UBIdend, coupled with optical endomicroscopy demonstrated real-time, in situ detection of bacteria in explanted whole human Cystic Fibrosis lungs.
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Affiliation(s)
- Ahsan R Akram
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom.
| | - Nicolaos Avlonitis
- EaStCHEM, The University of Edinburgh School of Chemistry, Joseph Black Building, West Mains Road, EH9 3FJ, Edinburgh, United Kingdom
| | - Emma Scholefield
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Marc Vendrell
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Neil McDonald
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Tashfeen Aslam
- EaStCHEM, The University of Edinburgh School of Chemistry, Joseph Black Building, West Mains Road, EH9 3FJ, Edinburgh, United Kingdom
| | - Thomas H Craven
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Calum Gray
- Clinical Research Imaging Centre, Queen's Medical Research Institute, Edinburgh BioQuarter, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - David S Collie
- The Roslin Institute and R(D)SVS, The University of Edinburgh, Easter Bush Veterinary Centre, Roslin, Midlothian, United Kingdom
| | - Andrew J Fisher
- Institute of Transplantation, Newcastle University, Freeman Hospital, High Heaton, Newcastle upon Tyne, NE7 7DN, United Kingdom
| | - Paul A Corris
- Institute of Transplantation, Newcastle University, Freeman Hospital, High Heaton, Newcastle upon Tyne, NE7 7DN, United Kingdom
| | - Timothy Walsh
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Christopher Haslett
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Mark Bradley
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom.
- EaStCHEM, The University of Edinburgh School of Chemistry, Joseph Black Building, West Mains Road, EH9 3FJ, Edinburgh, United Kingdom.
| | - Kevin Dhaliwal
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom.
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Welling MM, Hensbergen AW, Bunschoten A, Velders AH, Scheper H, Smits WK, Roestenberg M, van Leeuwen FWB. Fluorescent imaging of bacterial infections and recent advances made with multimodal radiopharmaceuticals. Clin Transl Imaging 2019. [DOI: 10.1007/s40336-019-00322-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Parker HE, Stone JM, Marshall ADL, Choudhary TR, Thomson RR, Dhaliwal K, Tanner MG. Fibre-based spectral ratio endomicroscopy for contrast enhancement of bacterial imaging and pulmonary autofluorescence. BIOMEDICAL OPTICS EXPRESS 2019; 10:1856-1869. [PMID: 31086708 PMCID: PMC6485003 DOI: 10.1364/boe.10.001856] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 02/21/2019] [Accepted: 02/25/2019] [Indexed: 06/01/2023]
Abstract
Fibre-based optical endomicroscopy (OEM) permits high resolution fluorescence microscopy in endoscopically accessible tissues. Fibred OEM has the potential to visualise pathologies targeted with fluorescent imaging probes and provide an in vivo in situ molecular pathology platform to augment disease understanding, diagnosis and stratification. Here we present an inexpensive widefield ratiometric fibred OEM system capable of enhancing the contrast between similar spectra of pathologically relevant fluorescent signals without the burden of complex spectral unmixing. As an exemplar, we demonstrate the potential of the platform to detect fluorescently labelled Gram-negative bacteria in the challenging environment of highly autofluorescent lung tissue in whole ex vivo human lungs.
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Affiliation(s)
- Helen E. Parker
- EPSRC Proteus IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - James M. Stone
- EPSRC Proteus IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
- Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath, UK
| | - Adam D. L. Marshall
- EPSRC Proteus IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Tushar R. Choudhary
- EPSRC Proteus IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, UK
| | - Robert R. Thomson
- EPSRC Proteus IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
- Scottish Universities Physics Alliance (SUPA), Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
| | - Kevin Dhaliwal
- EPSRC Proteus IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
| | - Michael G. Tanner
- EPSRC Proteus IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, UK
- Scottish Universities Physics Alliance (SUPA), Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
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Pedretti E, Tanner MG, Choudhary TR, Krstajić N, Megia-Fernandez A, Henderson RK, Bradley M, Thomson RR, Girkin JM, Dhaliwal K, Dalgarno PA. High-speed dual color fluorescence lifetime endomicroscopy for highly-multiplexed pulmonary diagnostic applications and detection of labeled bacteria. BIOMEDICAL OPTICS EXPRESS 2019; 10:181-195. [PMID: 30775092 PMCID: PMC6363193 DOI: 10.1364/boe.10.000181] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 11/21/2018] [Accepted: 11/24/2018] [Indexed: 05/03/2023]
Abstract
We present a dual-color laser scanning endomicroscope capable of fluorescence lifetime endomicroscopy at one frame per second (FPS). The scanning system uses a coherent imaging fiber with 30,000 cores. High-speed lifetime imaging is achieved by distributing the signal over an array of 1024 parallel single-photon avalanche diode detectors (SPADs), minimizing detection dead-time maximizing the number of photons detected per excitation pulse without photon pile-up to achieve the high frame rate. This also enables dual color fluorescence imaging by temporally shifting the dual excitation lasers, with respect to each other, to separate the two spectrally distinct fluorescent decays in time. Combining the temporal encoding, to provide spectral separation, with lifetime measurements we show a one FPS, multi-channel endomicroscopy platform for clinical applications and diagnosis. We demonstrate the potential of the system by imaging SmartProbe labeled bacteria in ex vivo samples of human lung using lifetime to differentiate bacterial fluorescence from the strong background lung autofluorescence which was used to provide structural information.
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Affiliation(s)
- Ettore Pedretti
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Sciences, Heriot–Watt University, Edinburgh EH14 4AS,
UK
- EPSRC Proteus Hub, Centre for Inflammation Research, Queen’s Medical Research Centre, University of Edinburgh, Edinburgh EH16 4TJ,
UK
- Currently with the Leibniz-Institute für Astrophysik Potsdam, Potsdam,
Germany
| | - Michael G. Tanner
- Scottish Universities Physics Alliance (SUPA), Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot–Watt University, Edinburgh EH14 4AS,
UK
- EPSRC Proteus Hub, Centre for Inflammation Research, Queen’s Medical Research Centre, University of Edinburgh, Edinburgh EH16 4TJ,
UK
| | - Tushar R. Choudhary
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Sciences, Heriot–Watt University, Edinburgh EH14 4AS,
UK
- EPSRC Proteus Hub, Centre for Inflammation Research, Queen’s Medical Research Centre, University of Edinburgh, Edinburgh EH16 4TJ,
UK
| | - Nikola Krstajić
- EPSRC Proteus Hub, Centre for Inflammation Research, Queen’s Medical Research Centre, University of Edinburgh, Edinburgh EH16 4TJ,
UK
- Institute for Integrated Micro and Nano Systems, School of Engineering, University of Edinburgh, Edinburgh EH9 3FF,
UK
- Currently with the University of Dundee, School of Science and Engineering, Dundee,
UK
| | | | - Robert K. Henderson
- Institute for Integrated Micro and Nano Systems, School of Engineering, University of Edinburgh, Edinburgh EH9 3FF,
UK
| | - Mark Bradley
- EPSRC Proteus Hub, Centre for Inflammation Research, Queen’s Medical Research Centre, University of Edinburgh, Edinburgh EH16 4TJ,
UK
- EaStChem, School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ,
UK
| | - Robert R. Thomson
- Scottish Universities Physics Alliance (SUPA), Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot–Watt University, Edinburgh EH14 4AS,
UK
- EPSRC Proteus Hub, Centre for Inflammation Research, Queen’s Medical Research Centre, University of Edinburgh, Edinburgh EH16 4TJ,
UK
| | - John M. Girkin
- Department of Physics, University of Durham, Durham DH1 3LE,
UK
| | - Kevin Dhaliwal
- EPSRC Proteus Hub, Centre for Inflammation Research, Queen’s Medical Research Centre, University of Edinburgh, Edinburgh EH16 4TJ,
UK
| | - Paul A. Dalgarno
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Sciences, Heriot–Watt University, Edinburgh EH14 4AS,
UK
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