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Compressed fluorescence lifetime imaging via combined TV-based and deep priors. PLoS One 2022; 17:e0271441. [PMID: 35960754 PMCID: PMC9374265 DOI: 10.1371/journal.pone.0271441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 06/30/2022] [Indexed: 11/19/2022] Open
Abstract
Compressed fluorescence lifetime imaging (Compressed-FLIM) is a novel Snapshot compressive imaging (SCI) method for single-shot widefield FLIM. This approach has the advantages of high temporal resolution and deep frame sequences, allowing for the analysis of FLIM signals that follow complex decay models. However, the precision of Compressed-FLIM is limited by reconstruction algorithms. To improve the reconstruction accuracy of Compressed-FLIM in dealing with large-scale FLIM problem, we developed a more effective combined prior model 3DTGp V_net, based on the Plug and Play (PnP) framework. Extensive numerical simulations indicate the proposed method eliminates reconstruction artifacts caused by the Deep denoiser networks. Moreover, it improves the reconstructed accuracy by around 4dB (peak signal-to-noise ratio; PSNR) over the state-of-the-art TV+FFDNet in test data sets. We conducted the single-shot FLIM experiment with different Rhodamine reagents and the results show that in practice, the proposed algorithm has promising reconstruction performance and more negligible lifetime bias.
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2
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Lin F, Zhang C, Zhao Y, Shen B, Hu R, Liu L, Qu J. In vivo two-photon fluorescence lifetime imaging microendoscopy based on fiber-bundle. OPTICS LETTERS 2022; 47:2137-2140. [PMID: 35486743 DOI: 10.1364/ol.453102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 03/13/2022] [Indexed: 06/14/2023]
Abstract
Fluorescence lifetime imaging microendoscopy (FLIME) has been reported to investigate the physicochemical microenvironment in biological tissue. In this work, we designed a two-photon (TP) FLIME system based on a fiber-bundle glued with an achromatic mini-objective with 1.4-mm diameter, which was coupled to a standard TP microscope containing a dispersion precompensation module in the laser source. With 840 nm excitation, the field of view and lateral resolution of our system are 390 µm and 1.55 µm, respectively. To examine the capability of imaging in vivo, we obtained Z-stack (0-130 µm) TP-FLIME images from the intestine's surface of a mouse injected with squaraine dye. Further, we utilized the TP-FLIME system to image the kidney, liver, and xenografted tumor at 100-µm depth in vivo with cellular resolution, which features the distribution of cells and tissue structures with better contrast than intensity images. These results demonstrated that the proposed system is capable of measuring fluorescence lifetime in situ and provides a powerful tool to research the deep tissue microenvironment naturally.
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3
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Bofinger R, Weitsman G, Evans R, Glaser M, Sander K, Allan H, Hochhauser D, Kalber TL, Årstad E, Hailes HC, Ng T, Tabor AB. Drug delivery, biodistribution and anti-EGFR activity: theragnostic nanoparticles for simultaneous in vivo delivery of tyrosine kinase inhibitors and kinase activity biosensors. NANOSCALE 2021; 13:18520-18535. [PMID: 34730152 PMCID: PMC8601123 DOI: 10.1039/d1nr02770k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 09/24/2021] [Indexed: 05/03/2023]
Abstract
In vivo delivery of small molecule therapeutics to cancer cells, assessment of the selectivity of administration, and measuring the efficacity of the drug in question at the molecule level, are important ongoing challenges in developing new classes of cancer chemotherapeutics. One approach that has the potential to provide targeted delivery, tracking of biodistribution and readout of efficacy, is to use multimodal theragnostic nanoparticles to deliver the small molecule therapeutic. In this paper, we report the development of targeted theragnostic lipid/peptide/DNA lipopolyplexes. These simultaneously deliver an inhibitor of the EGFR tyrosine kinase, and plasmid DNA coding for a Crk-based biosensor, Picchu-X, which when expressed in the target cells can be used to quantify the inhibition of EGFR in vivo in a mouse colorectal cancer xenograft model. Reversible bioconjugation of a known analogue of the tyrosine kinase inhibitor Mo-IPQA to a cationic peptide, and co-formulation with peptides containing both EGFR-binding and cationic sequences, allowed for good levels of inhibitor encapsulation with targeted delivery to LIM1215 colon cancer cells. Furthermore, high levels of expression of the Picchu-X biosensor in the LIM1215 cells in vivo allowed us to demonstrate, using fluorescence lifetime microscopy (FLIM)-based biosensing, that EGFR activity can be successfully suppressed by the tyrosine kinase inhibitor, released from the lipopolyplexes. Finally, we measured the biodistribution of lipopolyplexes containing 125I-labelled inhibitors and were able to demonstrate that the lipopolyplexes gave significantly higher drug delivery to the tumors compared with free drug.
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Affiliation(s)
- Robin Bofinger
- Department of Chemistry, University College London, 20, Gordon Street, London WC1H 0AJ, UK.
| | - Gregory Weitsman
- School of Cancer and Pharmaceutical Sciences, King's College London, London, SE1 1UL, UK.
| | - Rachel Evans
- School of Cancer and Pharmaceutical Sciences, King's College London, London, SE1 1UL, UK.
- UCL Cancer Institute, Paul O'Gorman Building, University College London, London WC1E 6DD, UK
| | - Matthias Glaser
- Department of Chemistry, University College London, 20, Gordon Street, London WC1H 0AJ, UK.
- Centre for Radiopharmaceutical Chemistry, Kathleen Lonsdale Building, 5 Gower Place, London WC1E 6BS, UK
| | - Kerstin Sander
- Department of Chemistry, University College London, 20, Gordon Street, London WC1H 0AJ, UK.
- Centre for Radiopharmaceutical Chemistry, Kathleen Lonsdale Building, 5 Gower Place, London WC1E 6BS, UK
| | - Helen Allan
- Department of Chemistry, University College London, 20, Gordon Street, London WC1H 0AJ, UK.
| | - Daniel Hochhauser
- UCL Cancer Institute, Paul O'Gorman Building, University College London, London WC1E 6DD, UK
| | - Tammy L Kalber
- Centre for Advanced Biomedical Imaging, Paul O'Gorman Building, University College London, London WC1E 6DD, UK
| | - Erik Årstad
- Department of Chemistry, University College London, 20, Gordon Street, London WC1H 0AJ, UK.
- Centre for Radiopharmaceutical Chemistry, Kathleen Lonsdale Building, 5 Gower Place, London WC1E 6BS, UK
| | - Helen C Hailes
- Department of Chemistry, University College London, 20, Gordon Street, London WC1H 0AJ, UK.
| | - Tony Ng
- School of Cancer and Pharmaceutical Sciences, King's College London, London, SE1 1UL, UK.
- UCL Cancer Institute, Paul O'Gorman Building, University College London, London WC1E 6DD, UK
| | - Alethea B Tabor
- Department of Chemistry, University College London, 20, Gordon Street, London WC1H 0AJ, UK.
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4
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Lee J, Kim B, Park B, Won Y, Kim SY, Lee S. Real-time cancer diagnosis of breast cancer using fluorescence lifetime endoscopy based on the pH. Sci Rep 2021; 11:16864. [PMID: 34413447 PMCID: PMC8376886 DOI: 10.1038/s41598-021-96531-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 08/04/2021] [Indexed: 12/11/2022] Open
Abstract
A biopsy is often performed for the diagnosis of cancer during a surgical operation. In addition, pathological biopsy is required to discriminate the margin between cancer tissues and normal tissues in surgical specimens. In this study, we presented a novel method for discriminating between tumor and normal tissues using fluorescence lifetime endoscopy (FLE). We demonstrated the relationship between the fluorescence lifetime and pH in fluorescein using the proposed fluorescence lifetime measurement system. We also showed that cancer could be diagnosed based on this relationship by assessing differences in pH based fluorescence lifetime between cancer and normal tissues using two different types of tumor such as breast tumors (MDA-MB-361) and skin tumors (A375), where cancer tissues have ranged in pH from 4.5 to 7.0 and normal tissues have ranged in pH from 7.0 to 7.4. To support this approach, we performed hematoxylin and eosin (H&E) staining test of normal and cancer tissues within a certain area. From these results, we showed the ability to diagnose a cancer using FLE technique, which were consistent with the diagnosis of a cancer with H&E staining test. In summary, the proposed pH-based FLE technique could provide a real time, in vivo, and in-situ clinical diagnostic method for the cancer surgical and could be presented as an alternative to biopsy procedures.
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Affiliation(s)
- Jooran Lee
- Medical Device Development Center, Osong Medical Innovation Foundation, Cheongju, Chungbuk, 28160, South Korea
| | - Byungyeon Kim
- Medical Device Development Center, Osong Medical Innovation Foundation, Cheongju, Chungbuk, 28160, South Korea
| | - Byungjun Park
- Medical Device Development Center, Osong Medical Innovation Foundation, Cheongju, Chungbuk, 28160, South Korea
| | - Youngjae Won
- Medical Device Development Center, Osong Medical Innovation Foundation, Cheongju, Chungbuk, 28160, South Korea
- Intek-Medi, 123, Osongsaengmyeong-ro, Osong-eup, Heungdeok-gu, Cheongju-si, Chungcheongbuk-do, South Korea
| | - Sang-Yeob Kim
- Asan Institute for Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro, 43-gil, Songpa-gu, Seoul, 138-736, South Korea
| | - Seungrag Lee
- Medical Device Development Center, Osong Medical Innovation Foundation, Cheongju, Chungbuk, 28160, South Korea.
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5
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He Z, Wang P, Ye X. Novel endoscopic optical diagnostic technologies in medical trial research: recent advancements and future prospects. Biomed Eng Online 2021; 20:5. [PMID: 33407477 PMCID: PMC7789310 DOI: 10.1186/s12938-020-00845-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 12/23/2020] [Indexed: 12/20/2022] Open
Abstract
Novel endoscopic biophotonic diagnostic technologies have the potential to non-invasively detect the interior of a hollow organ or cavity of the human body with subcellular resolution or to obtain biochemical information about tissue in real time. With the capability to visualize or analyze the diagnostic target in vivo, these techniques gradually developed as potential candidates to challenge histopathology which remains the gold standard for diagnosis. Consequently, many innovative endoscopic diagnostic techniques have succeeded in detection, characterization, and confirmation: the three critical steps for routine endoscopic diagnosis. In this review, we mainly summarize researches on emerging endoscopic optical diagnostic techniques, with emphasis on recent advances. We also introduce the fundamental principles and the development of those techniques and compare their characteristics. Especially, we shed light on the merit of novel endoscopic imaging technologies in medical research. For example, hyperspectral imaging and Raman spectroscopy provide direct molecular information, while optical coherence tomography and multi-photo endomicroscopy offer a more extensive detection range and excellent spatial-temporal resolution. Furthermore, we summarize the unexplored application fields of these endoscopic optical techniques in major hospital departments for biomedical researchers. Finally, we provide a brief overview of the future perspectives, as well as bottlenecks of those endoscopic optical diagnostic technologies. We believe all these efforts will enrich the diagnostic toolbox for endoscopists, enhance diagnostic efficiency, and reduce the rate of missed diagnosis and misdiagnosis.
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Affiliation(s)
- Zhongyu He
- Biosensor National Special Laboratory, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Peng Wang
- Biosensor National Special Laboratory, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Xuesong Ye
- Biosensor National Special Laboratory, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, People's Republic of China.
- State Key Laboratory of CAD and CG, Zhejiang University, Hangzhou, 310058, People's Republic of China.
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6
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Zickus V, Wu ML, Morimoto K, Kapitany V, Fatima A, Turpin A, Insall R, Whitelaw J, Machesky L, Bruschini C, Faccio D, Charbon E. Fluorescence lifetime imaging with a megapixel SPAD camera and neural network lifetime estimation. Sci Rep 2020; 10:20986. [PMID: 33268900 PMCID: PMC7710711 DOI: 10.1038/s41598-020-77737-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 11/06/2020] [Indexed: 01/07/2023] Open
Abstract
Fluorescence lifetime imaging microscopy (FLIM) is a key technology that provides direct insight into cell metabolism, cell dynamics and protein activity. However, determining the lifetimes of different fluorescent proteins requires the detection of a relatively large number of photons, hence slowing down total acquisition times. Moreover, there are many cases, for example in studies of cell collectives, where wide-field imaging is desired. We report scan-less wide-field FLIM based on a 0.5 MP resolution, time-gated Single Photon Avalanche Diode (SPAD) camera, with acquisition rates up to 1 Hz. Fluorescence lifetime estimation is performed via a pre-trained artificial neural network with 1000-fold improvement in processing times compared to standard least squares fitting techniques. We utilised our system to image HT1080-human fibrosarcoma cell line as well as Convallaria. The results show promise for real-time FLIM and a viable route towards multi-megapixel fluorescence lifetime images, with a proof-of-principle mosaic image shown with 3.6 MP.
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Affiliation(s)
- Vytautas Zickus
- School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Ming-Lo Wu
- Advanced Quantum Architecture Laboratory, Ecole Polytechnique Fédérale de Lausanne, 2002, Neuchâtel, Switzerland
| | - Kazuhiro Morimoto
- Advanced Quantum Architecture Laboratory, Ecole Polytechnique Fédérale de Lausanne, 2002, Neuchâtel, Switzerland
| | - Valentin Kapitany
- School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Areeba Fatima
- School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Alex Turpin
- School of Computing Science, University of Glasgow, Glasgow, G12 8LT, UK
| | - Robert Insall
- University of Glasgow Institute of Cancer Sciences, Glasgow, UK.,Cancer Research UK, Beatson Institute, Glasgow, UK
| | - Jamie Whitelaw
- University of Glasgow Institute of Cancer Sciences, Glasgow, UK.,Cancer Research UK, Beatson Institute, Glasgow, UK
| | - Laura Machesky
- University of Glasgow Institute of Cancer Sciences, Glasgow, UK.,Cancer Research UK, Beatson Institute, Glasgow, UK
| | - Claudio Bruschini
- Advanced Quantum Architecture Laboratory, Ecole Polytechnique Fédérale de Lausanne, 2002, Neuchâtel, Switzerland
| | - Daniele Faccio
- School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Edoardo Charbon
- Advanced Quantum Architecture Laboratory, Ecole Polytechnique Fédérale de Lausanne, 2002, Neuchâtel, Switzerland.
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7
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Abstract
The aim of present study was to investigate the binding interactions of a model hydrophobic molecule, dimethylcurcumin (DMC) with nanoparticle form of bovine serum albumin (BSA) using fluorescence spectroscopy techniques. For this, BSA nanoparticles (size = 62.0 ± 3.5 nm, molecular weight = 11,243 ± 3445 kD) prepared by thermal denaturation method was mixed with DMC in solution and monitored for fluorescence emission of tryptophan (Trp) residue as well as DMC separately. The emission maximum of DMC in nanoparticles form exhibited more blue sift and quenched the excited state of tryptophan (Trp) by six fold higher than in the native form of BSA. By analyzing Trp fluorescence, the mean binding constant (K) estimated for the interaction of DMC with native and nanoparticles forms of BSA was 2.7 ± 0.4 × 104 M-1 and 1.5 ± 0.5 × 105 M-1 respectively. Together these results suggested that DMC experienced a more rigid environment in nanoparticles than in native form of BSA. Additionally the above determined K values were in agreement with those reported previously by absorption techniques. Further direct energy transfer was observed between Trp and DMC, using which the distance (r) calculated between them was 28.25 ± 0.27 Ǻ in BSA native. Similar analysis involving BSA nanoparticle and DMC revealed a distance of 24.25 ± 1.05 Ǻ between the hydrophobic core and the ligand. Finally interaction of DMC with BSA was validated through molecular docking studies, which indicated sub-domain IIA as the binding site of DMC. Thus it is concluded that intrinsic fluorescence of protein can be utilized to study the interaction of its different physical forms with any hydrophobic ligand.
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8
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Lagarto JL, Shcheslavskiy V, Pavone FS, Cicchi R. Real-time fiber-based fluorescence lifetime imaging with synchronous external illumination: A new path for clinical translation. JOURNAL OF BIOPHOTONICS 2020; 13:e201960119. [PMID: 31742905 DOI: 10.1002/jbio.201960119] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 11/13/2019] [Accepted: 11/15/2019] [Indexed: 05/22/2023]
Abstract
Time-correlated single photon counting is the "gold-standard" method for fluorescence lifetime measurements and has demonstrated potential for clinical deployment. However, the translation of the technology into clinic is hindered by the use of ultrasensitive detectors, which make the fluorescence acquisition impractical with bright lighting conditions such as in clinical settings. We address this limitation by interleaving periodic fluorescence detection with synchronous out-of-phase externally modulated light source, thus guaranteeing specimen illumination and a fluorescence signal free from bright background light upon temporal separation. Fluorescence lifetime maps are generated in real-time from single-point measurements by tracking a reference beam and using the phasor approach. We demonstrate the feasibility and practicality of this technique in a number of biological specimens, including real-time mapping of degraded articular cartilage. This method is compatible and can be integrated with existing clinical microscopic, endoscopic and robotic modalities, thus offering a new pathway towards label-free diagnostics and surgical guidance in a number of clinical applications.
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Affiliation(s)
- João L Lagarto
- National Institute of Optics, National Research Council (INO-CNR), Sesto Fiorentino, Italy
- European Laboratory for Non-linear Spectroscopy (LENS), Sesto Fiorentino, Italy
| | | | - Francesco S Pavone
- National Institute of Optics, National Research Council (INO-CNR), Sesto Fiorentino, Italy
- European Laboratory for Non-linear Spectroscopy (LENS), Sesto Fiorentino, Italy
- Department of Physics, University of Florence, Sesto Fiorentino, Italy
| | - Riccardo Cicchi
- National Institute of Optics, National Research Council (INO-CNR), Sesto Fiorentino, Italy
- European Laboratory for Non-linear Spectroscopy (LENS), Sesto Fiorentino, Italy
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9
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Schneckenburger H. Förster resonance energy transfer-what can we learn and how can we use it? Methods Appl Fluoresc 2019; 8:013001. [PMID: 31715588 DOI: 10.1088/2050-6120/ab56e1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The present manuscript gives a short overview on Förster Resonance Energy Transfer (FRET) of molecular interactions in the nanometre range. First, its principle is described and a short historical overview is given. Subsequently some principal methods and applications of FRET sensing and imaging are described (with some emphasis on fluorescence lifetime imaging, FLIM), and finally two innovative FRET techniques are presented in more detail. Applications are focused on measurements of living cells.
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10
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Li Y, Jia H, Chen S, Tian J, Liang L, Yuan F, Yu H, Li DDU. Single-shot time-gated fluorescence lifetime imaging using three-frame images. OPTICS EXPRESS 2018; 26:17936-17947. [PMID: 30114076 DOI: 10.1364/oe.26.017936] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 06/14/2018] [Indexed: 06/08/2023]
Abstract
Qualitative and quantitative measurements of complex flows demand for fast single-shot fluorescence lifetime imaging (FLI) technology with high precision. A method, single-shot time-gated fluorescence lifetime imaging using three-frame images (TFI-TGFLI), is presented. To our knowledge, it is the first work to combine a three-gate rapid lifetime determination (RLD) scheme and a four-channel framing camera to achieve this goal. Different from previously proposed two-gate RLD schemes, TFI-TGFLI can provide a wider lifetime range 0.6 ~ 13ns with reasonable precision. The performances of the proposed approach have been examined by both Monte-Carlo simulations and toluene seeded gas mixing jet diagnosis experiments. The measured average lifetimes of the whole excited areas agree well with the results obtained by the streak camera, and they are 7.6ns (N2 = 7L/min; O2 < 0.1L/min) and 2.6ns (N2 = 19L/min; O2 = 1L/min) with the standard deviations of 1.7ns and 0.8ns among the lifetime image pixels, respectively. The concentration distributions of the quenchers and fluorescent species were further analyzed, and they are consistent with the experimental settings.
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11
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Hage CH, Leclerc P, Brevier J, Fabert M, Le Nézet C, Kudlinski A, Héliot L, Louradour F. Towards two-photon excited endogenous fluorescence lifetime imaging microendoscopy. BIOMEDICAL OPTICS EXPRESS 2018; 9:142-156. [PMID: 29359093 PMCID: PMC5772571 DOI: 10.1364/boe.9.000142] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 11/16/2017] [Accepted: 12/04/2017] [Indexed: 05/12/2023]
Abstract
In situ fluorescence lifetime imaging microscopy (FLIM) in an endoscopic configuration of the endogenous biomarker nicotinamide adenine dinucleotide (NADH) has a great potential for malignant tissue diagnosis. Moreover, two-photon nonlinear excitation provides intrinsic optical sectioning along with enhanced imaging depth. We demonstrate, for the first time to our knowledge, nonlinear endogenous FLIM in a fibered microscope with proximal detection, applied to NADH in cultured cells, as a first step to a nonlinear endomicroscope, using a double-clad microstructured fiber with convenient fiber length (> 3 m) and excitation pulse duration (≈50 fs). Fluorescence photons are collected by the fiber inner cladding and we show that its contribution to the impulse response function (IRF), which originates from its intermodal and chromatic dispersions, is small (< 600 ps) and stable for lengths up to 8 m and allows for short lifetime measurements. We use the phasor representation as a quick visualization tool adapted to the endoscopy speed requirements.
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Affiliation(s)
- C. H. Hage
- Université de Limoges, XLIM, UMR CNRS 7252, 123 Avenue A. Thomas, 87060 Limoges, France
| | - P. Leclerc
- Université de Limoges, XLIM, UMR CNRS 7252, 123 Avenue A. Thomas, 87060 Limoges, France
| | - J. Brevier
- Université de Limoges, XLIM, UMR CNRS 7252, 123 Avenue A. Thomas, 87060 Limoges, France
| | - M. Fabert
- Université de Limoges, XLIM, UMR CNRS 7252, 123 Avenue A. Thomas, 87060 Limoges, France
| | - C. Le Nézet
- Univ. Lille, CNRS, UMR 8523 – PhLAM – Physique des Lasers, Atomes et Molécules, F-59000 Lille, France
| | - A. Kudlinski
- Univ. Lille, CNRS, UMR 8523 – PhLAM – Physique des Lasers, Atomes et Molécules, F-59000 Lille, France
| | - L. Héliot
- Univ. Lille, CNRS, UMR 8523 – PhLAM – Physique des Lasers, Atomes et Molécules, F-59000 Lille, France
| | - F. Louradour
- Université de Limoges, XLIM, UMR CNRS 7252, 123 Avenue A. Thomas, 87060 Limoges, France
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12
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Coda S, Siersema PD, Stamp GWH, Thillainayagam AV. Biophotonic endoscopy: a review of clinical research techniques for optical imaging and sensing of early gastrointestinal cancer. Endosc Int Open 2015; 3:E380-92. [PMID: 26528489 PMCID: PMC4612244 DOI: 10.1055/s-0034-1392513] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Accepted: 05/07/2015] [Indexed: 02/08/2023] Open
Abstract
Detection, characterization, and staging constitute the fundamental elements in the endoscopic diagnosis of gastrointestinal diseases, but histology still remains the diagnostic gold standard. New developments in endoscopic techniques may challenge histopathology in the near future. An ideal endoscopic technique should combine a wide-field, "red flag" screening technique with an optical contrast or microscopy method for characterization and staging, all simultaneously available during the procedure. In theory, biophotonic advances have the potential to unite these elements to allow in vivo "optical biopsy." These techniques may ultimately offer the potential to increase the rates of detection of high risk lesions and the ability to target biopsies and resections, and so reduce the need for biopsy, costs, and uncertainty for patients. However, their utility and sensitivity in clinical practice must be evaluated against those of conventional histopathology. This review describes some of the most recent applications of biophotonics in endoscopic optical imaging and metrology, along with their fundamental principles and the clinical experience that has been acquired in their deployment as tools for the endoscopist. Particular emphasis has been placed on translational label-free optical techniques, such as fluorescence spectroscopy, fluorescence lifetime imaging microscopy (FLIM), two-photon and multi-photon microscopy, second harmonic generation (SHG) and third harmonic generation (THG) imaging, optical coherence tomography (OCT), diffuse reflectance, Raman spectroscopy, and molecular imaging.
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Affiliation(s)
- Sergio Coda
- Section of Gastroenterology and Hepatology, Department of Medicine, Imperial College London, London, United Kingdom,Photonics Group, Department of Physics, Imperial College London, London, United Kingdom,Endoscopy Unit, Department of Gastroenterology, Charing Cross Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom,Department of Endoscopy, North East London NHS Treatment Centre, Care UK, London, United Kingdom,Corresponding author Sergio Coda, MD, PhD Imperial College London – Medicine and PhysicsPrince Consort RoadLondon SW7 2AZUnited Kingdom+44-20-75947714
| | - Peter D. Siersema
- Department of Gastroenterology and Hepatology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Gordon W. H. Stamp
- Photonics Group, Department of Physics, Imperial College London, London, United Kingdom,Experimental Histopathology Laboratory, Cancer Research UK London Research Institute, London, United Kingdom,Department of Histopathology, Imperial College London, London, United Kingdom
| | - Andrew V. Thillainayagam
- Section of Gastroenterology and Hepatology, Department of Medicine, Imperial College London, London, United Kingdom,Photonics Group, Department of Physics, Imperial College London, London, United Kingdom,Endoscopy Unit, Department of Gastroenterology, Charing Cross Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom
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13
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Zou Y, Zhang W, Chau FS, Zhou G. Miniature adjustable-focus endoscope with a solid electrically tunable lens. OPTICS EXPRESS 2015; 23:20582-92. [PMID: 26367911 DOI: 10.1364/oe.23.020582] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The design, fabrication and characterization of a miniature adjustable-focus endoscope are reported. Such an endoscope consists of a solid tunable lens for optical power tuning, two slender piezoelectric benders for laterally moving the lens elements perpendicular to the optical axis, and an image fiber bundle for image transmission. Both optical and mechanical designs are presented in this paper. Dynamic tuning of optical powers from about 135 diopters to about 205 diopters is experimentally achieved from the solid tunable lens, which contains two freeform surfaces governed by 6-degree polynomials and optimized by ray tracing studies. Results show that there is no obvious distortion or blurring in the images obtained, and the recorded resolution of the lens reaches about 30 line pairs per mm. Three test targets located at various object distances of 20 mm, 50 mm and 150 mm are focused individually by the endoscope by applying different driving DC voltages to demonstrate its adjustable-focus capability.
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14
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15
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Sparks H, Warren S, Guedes J, Yoshida N, Charn TC, Guerra N, Tatla T, Dunsby C, French P. A flexible wide-field FLIM endoscope utilising blue excitation light for label-free contrast of tissue. JOURNAL OF BIOPHOTONICS 2015; 8:168-78. [PMID: 24573953 PMCID: PMC4737404 DOI: 10.1002/jbio.201300203] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 01/20/2014] [Accepted: 02/06/2014] [Indexed: 05/26/2023]
Abstract
Fluorescence lifetime imaging (FLIM) has previously been shown to provide contrast between normal and diseased tissue. Here we present progress towards clinical and preclinical FLIM endoscopy of tissue autofluorescence, demonstrating a flexible wide-field endoscope that utilised a low average power blue picosecond laser diode excitation source and was able to acquire ∼mm-scale spatial maps of autofluorescence lifetimes from fresh ex vivo diseased human larynx biopsies in ∼8 seconds using an average excitation power of ∼0.5 mW at the specimen. To illustrate its potential for FLIM at higher acquisition rates, a higher power mode-locked frequency doubled Ti:Sapphire laser was used to demonstrate FLIM of ex vivo mouse bowel at up to 2.5 Hz using 10 mW of average excitation power at the specimen.
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Affiliation(s)
- Hugh Sparks
- Photonics Group, Physics Department, Imperial College London, London SW7 2AZ, UK.
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16
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17
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Devauges V, Matthews DR, Aluko J, Nedbal J, Levitt JA, Poland SP, Coban O, Weitsman G, Monypenny J, Ng T, Ameer-Beg SM. Steady-state acceptor fluorescence anisotropy imaging under evanescent excitation for visualisation of FRET at the plasma membrane. PLoS One 2014; 9:e110695. [PMID: 25360776 PMCID: PMC4215982 DOI: 10.1371/journal.pone.0110695] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 09/15/2014] [Indexed: 11/22/2022] Open
Abstract
We present a novel imaging system combining total internal reflection fluorescence (TIRF) microscopy with measurement of steady-state acceptor fluorescence anisotropy in order to perform live cell Förster Resonance Energy Transfer (FRET) imaging at the plasma membrane. We compare directly the imaging performance of fluorescence anisotropy resolved TIRF with epifluorescence illumination. The use of high numerical aperture objective for TIRF required correction for induced depolarization factors. This arrangement enabled visualisation of conformational changes of a Raichu-Cdc42 FRET biosensor by measurement of intramolecular FRET between eGFP and mRFP1. Higher activity of the probe was found at the cell plasma membrane compared to intracellularly. Imaging fluorescence anisotropy in TIRF allowed clear differentiation of the Raichu-Cdc42 biosensor from negative control mutants. Finally, inhibition of Cdc42 was imaged dynamically in live cells, where we show temporal changes of the activity of the Raichu-Cdc42 biosensor.
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Affiliation(s)
- Viviane Devauges
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
| | - Daniel R. Matthews
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
| | - Justin Aluko
- Department of Physics, King's College London, London, United Kingdom
| | - Jakub Nedbal
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
| | - James A. Levitt
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
| | - Simon P. Poland
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
| | - Oana Coban
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
| | - Gregory Weitsman
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
| | - James Monypenny
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
| | - Tony Ng
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
- UCL Cancer Institute, University College London, London, United Kingdom
| | - Simon M. Ameer-Beg
- Richard Dimbleby Cancer Research Laboratory, Division of Cancer Studies and Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
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18
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Cheng S, Cuenca RM, Liu B, Malik BH, Jabbour JM, Maitland KC, Wright J, Cheng YSL, Jo JA. Handheld multispectral fluorescence lifetime imaging system for in vivo applications. BIOMEDICAL OPTICS EXPRESS 2014; 5:921-31. [PMID: 24688824 PMCID: PMC3959845 DOI: 10.1364/boe.5.000921] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 02/19/2014] [Accepted: 02/19/2014] [Indexed: 05/19/2023]
Abstract
There is an increasing interest in the application of fluorescence lifetime imaging (FLIM) for medical diagnosis. Central to the clinical translation of FLIM technology is the development of compact and high-speed clinically compatible systems. We present a handheld probe design consisting of a small maneuverable box fitted with a rigid endoscope, capable of continuous lifetime imaging at multiple emission bands simultaneously. The system was characterized using standard fluorescent dyes. The performance was then further demonstrated by imaging a hamster cheek pouch in vivo, and oral mucosa tissue both ex vivo and in vivo, all using safe and permissible exposure levels. Such a design can greatly facilitate the evaluation of FLIM for oral cancer imaging in vivo.
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Affiliation(s)
- Shuna Cheng
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, Texas 77843, USA
| | - Rodrigo M. Cuenca
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, Texas 77843, USA
| | - Boang Liu
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, Texas 77843, USA
| | - Bilal H. Malik
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, Texas 77843, USA
| | - Joey M. Jabbour
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, Texas 77843, USA
| | - Kristen C. Maitland
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, Texas 77843, USA
| | - John Wright
- Department of Diagnostic Sciences, Texas A&M University Health Science Center—Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, Texas 75246, USA
| | - Yi-Shing Lisa Cheng
- Department of Diagnostic Sciences, Texas A&M University Health Science Center—Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, Texas 75246, USA
| | - Javier A. Jo
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, Texas 77843, USA
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19
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Ba C, Bah ST, D'Auteuil M, Ashrit PV, Vallée R. Fabrication of high-quality VO2 thin films by ion-assisted dual ac magnetron sputtering. ACS APPLIED MATERIALS & INTERFACES 2013; 5:12520-12525. [PMID: 24215606 DOI: 10.1021/am403807u] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The technique of cathodic ac dual magnetron sputtering along with the high energy ionic bombardment is known to yield high-quality thin films in terms of their uniformity and high density. This technique has been applied for the first time to achieve thermochromic VO2 thin films that show a high optical and electrical contrast between normal and switched states. In this two-step process Vanadium metal films were deposited and subsequently oxidized in optimum conditions to achieve stoichiometric VO2 films. Typical films switched between more than 40 % to less than 5 % transmission in the infrared region while undergoing an electrical sheet resistance change between 1 × 10(5) and 1 × 10(2) Ω/cm(2). The application potential of such VO2 films in integrated optics is deemed high.
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Affiliation(s)
- Cheikhou Ba
- Centre d'optique, photonique et laser (COPL), Université Laval , 2375 rue de la terrasse, Québec, Quebec, Canada G1V 0A6
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20
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Descamps E, Duroure N, Deiss F, Leichlé T, Adam C, Mailley P, Aït-Ikhlef A, Livache T, Nicu L, Sojic N. Functionalization of optical nanotip arrays with an electrochemical microcantilever for multiplexed DNA detection. LAB ON A CHIP 2013; 13:2956-62. [PMID: 23695411 DOI: 10.1039/c3lc50335f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Optical nanotip arrays fabricated on etched fiber bundles were functionalized with DNA spots. Such unconventional substrates (3D and non-planar) are difficult to pattern with standard microfabrication techniques but, using an electrochemical cantilever, up to 400 spots were electrodeposited on the nanostructured optical surface in 5 min. This approach allows each spot to be addressed individually and multiplexed fluorescence detection is demonstrated. Finally, remote fluorescence detection was performed by imaging through the optical fiber bundle itself after hybridisation with the complementary sequence.
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Affiliation(s)
- Emeline Descamps
- Institut des Sciences Moléculaires, UMR 5255 CNRS, Université Bordeaux 1-ENSCBP 16, Avenue Pey-Berland, 33607 Pessac, France
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21
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Cheng S, Rico-Jimenez JJ, Jabbour J, Malik B, Maitland KC, Wright J, Cheng YSL, Jo JA. Flexible endoscope for continuous in vivo multispectral fluorescence lifetime imaging. OPTICS LETTERS 2013; 38:1515-7. [PMID: 23632536 PMCID: PMC3702045 DOI: 10.1364/ol.38.001515] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Fluorescence lifetime imaging (FLIM) offers a noninvasive approach for characterizing the biochemical composition of biological tissue. There has been an increasing interest in the application of multispectral FLIM for medical diagnosis. Central to the clinical translation of FLIM technology is the development of compact and high-speed endoscopy systems. Unfortunately, the predominant multispectral FLIM approaches suffer from limitations that impede the development of endoscopy systems that are suitable for in vivo tissue imaging. We present a compact wide-field time-gated FLIM flexible endoscope capable of continuous lifetime imaging of up to three fluorescence emission bands simultaneously. This endoscope design will facilitate the evaluation of FLIM for in vivo applications.
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Affiliation(s)
- Shuna Cheng
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, College Station, TX 77843, USA
| | - J. Jesus Rico-Jimenez
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, College Station, TX 77843, USA
| | - Joey Jabbour
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, College Station, TX 77843, USA
| | - Bilal Malik
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, College Station, TX 77843, USA
| | - Kristen C. Maitland
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, College Station, TX 77843, USA
| | - John Wright
- Department of Diagnostic Sciences, Texas A&M University Health Science Center – Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246, USA
| | - Yi-Shing Lisa Cheng
- Department of Diagnostic Sciences, Texas A&M University Health Science Center – Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246, USA
| | - Javier A. Jo
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, College Station, TX 77843, USA
- Corresponding author:
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22
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Zhang H, Yuan J, Fu L. Imaging Fourier transform endospectroscopy for in vivo and in situ multispectral imaging. OPTICS EXPRESS 2012. [PMID: 23188298 DOI: 10.1364/oe.20.023349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We report the design and implementation of a multispectral imaging Fourier transform endospectroscopy (IFTES) system. The IFTES system employs a flexible fiber bundle catheter coupled to a home-built imaging Fourier transform spectroscope. The instrument enables the performance of non- or minimally invasive subsurface imaging and multispectral imaging at the cellular level in vivo and in situ. A maximum spectral resolution of 0.2 nm at 632.8 nm and a lateral resolution of 4.4 μm were proved. Preliminary results of a standard resolution target, ex-vivo small animal tissue, single wavelength laser, fluorescence solution, in-vivo mouse skin, microspheres mixture, and in-vivo transgenic mouse brain were given to demonstrate the potential of the technique.
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Affiliation(s)
- Hongming Zhang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, 1037 Luoyu Rd., Wuhan 430074, China
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23
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Hötzer B, Medintz IL, Hildebrandt N. Fluorescence in nanobiotechnology: sophisticated fluorophores for novel applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:2297-326. [PMID: 22678833 DOI: 10.1002/smll.201200109] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 02/22/2012] [Indexed: 05/26/2023]
Abstract
Nanobiotechnology is one of the fastest growing and broadest-ranged interdisciplinary subfields of the nanosciences. Countless hybrid bio-inorganic composites are currently being pursued for various uses, including sensors for medical and diagnostic applications, light- and energy-harvesting devices, along with multifunctional architectures for electronics and advanced drug-delivery. Although many disparate biological and nanoscale materials will ultimately be utilized as the functional building blocks to create these devices, a common element found among a large proportion is that they exert or interact with light. Clearly continuing development will rely heavily on incorporating many different types of fluorophores into these composite materials. This review covers the growing utility of different classes of fluorophores in nanobiotechnology, from both a photophysical and a chemical perspective. For each major structural or functional class of fluorescent probe, several representative applications are provided, and the necessary technological background for acquiring the desired nano-bioanalytical information are presented.
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Affiliation(s)
- Benjamin Hötzer
- NanoBioPhotonics, Institut d'Electronique Fondamentale, Université Paris-Sud, 91405 Orsay Cedex, France
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24
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Matthews DR, Fruhwirth GO, Weitsman G, Carlin LM, Ofo E, Keppler M, Barber PR, Tullis IDC, Vojnovic B, Ng T, Ameer-Beg SM. A multi-functional imaging approach to high-content protein interaction screening. PLoS One 2012; 7:e33231. [PMID: 22506000 PMCID: PMC3323588 DOI: 10.1371/journal.pone.0033231] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Accepted: 02/06/2012] [Indexed: 12/20/2022] Open
Abstract
Functional imaging can provide a level of quantification that is not possible in what might be termed traditional high-content screening. This is due to the fact that the current state-of-the-art high-content screening systems take the approach of scaling-up single cell assays, and are therefore based on essentially pictorial measures as assay indicators. Such phenotypic analyses have become extremely sophisticated, advancing screening enormously, but this approach can still be somewhat subjective. We describe the development, and validation, of a prototype high-content screening platform that combines steady-state fluorescence anisotropy imaging with fluorescence lifetime imaging (FLIM). This functional approach allows objective, quantitative screening of small molecule libraries in protein-protein interaction assays. We discuss the development of the instrumentation, the process by which information on fluorescence resonance energy transfer (FRET) can be extracted from wide-field, acceptor fluorescence anisotropy imaging and cross-checking of this modality using lifetime imaging by time-correlated single-photon counting. Imaging of cells expressing protein constructs where eGFP and mRFP1 are linked with amino-acid chains of various lengths (7, 19 and 32 amino acids) shows the two methodologies to be highly correlated. We validate our approach using a small-scale inhibitor screen of a Cdc42 FRET biosensor probe expressed in epidermoid cancer cells (A431) in a 96 microwell-plate format. We also show that acceptor fluorescence anisotropy can be used to measure variations in hetero-FRET in protein-protein interactions. We demonstrate this using a screen of inhibitors of internalization of the transmembrane receptor, CXCR4. These assays enable us to demonstrate all the capabilities of the instrument, image processing and analytical techniques that have been developed. Direct correlation between acceptor anisotropy and donor FLIM is observed for FRET assays, providing an opportunity to rapidly screen proteins, interacting on the nano-meter scale, using wide-field imaging.
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Affiliation(s)
- Daniel R. Matthews
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
| | - Gilbert O. Fruhwirth
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
| | - Gregory Weitsman
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
| | - Leo M. Carlin
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
| | - Enyinnaya Ofo
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
| | - Melanie Keppler
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
| | - Paul R. Barber
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
- Gray Institute for Radiation Oncology and Biology, Department of Oncology, University of Oxford, Oxford, United Kingdom
| | - Iain D. C. Tullis
- Gray Institute for Radiation Oncology and Biology, Department of Oncology, University of Oxford, Oxford, United Kingdom
| | - Borivoj Vojnovic
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
- Gray Institute for Radiation Oncology and Biology, Department of Oncology, University of Oxford, Oxford, United Kingdom
| | - Tony Ng
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
| | - Simon M. Ameer-Beg
- Division of Cancer Studies, Randall Division of Cell and Molecular Biophysics, King’s College London, London, United Kingdom
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25
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Hajireza P, Shi W, Zemp RJ. Real-time handheld optical-resolution photoacoustic microscopy. OPTICS EXPRESS 2011; 19:20097-102. [PMID: 21997020 DOI: 10.1364/oe.19.020097] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
In this paper a new generation of optical-resolution photoacoustic microscopy (OR-PAM) with a wide range of potential clinical applications is demonstrated. Using fast scanning mirrors, an image guide with 30,000 fiber pixels, a refocusing lens and a unique probe we managed to reduce the footprint of an OR-PAM system from a stationary table-top system to a portable, 4 cm by 6 cm, probe weighing ~500 g tethered to a scanning unit. The phantom studies show that the handheld optical-resolution photoacoustic microscope is able to image with ~7 μm resolution. For in vivo studies images of the microvasculature in a Swiss Webster mouse ear are shown. The compact, flexible nature of the proposed design and the small footprint of the apparatus increase the usability of OR-PAM for potential clinical applications such as in dermatology.
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Affiliation(s)
- Parsin Hajireza
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 2V, Canada
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26
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Niesner RA, Hauser AE. Recent advances in dynamic intravital multi-photon microscopy. Cytometry A 2011; 79:789-98. [DOI: 10.1002/cyto.a.21140] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Revised: 08/11/2011] [Accepted: 08/13/2011] [Indexed: 01/09/2023]
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27
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Leung RWK, Yeh SCA, Fang Q. Effects of incomplete decay in fluorescence lifetime estimation. BIOMEDICAL OPTICS EXPRESS 2011; 2:2517-31. [PMID: 21991544 PMCID: PMC3184861 DOI: 10.1364/boe.2.002517] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 07/21/2011] [Accepted: 07/31/2011] [Indexed: 05/06/2023]
Abstract
Fluorescence lifetime imaging has emerged as an important microscopy technique, where high repetition rate lasers are the primary light sources. As fluorescence lifetime becomes comparable to intervals between consecutive excitation pulses, incomplete fluorescence decay from previous pulses can superimpose onto the subsequent decay measurements. Using a mathematical model, the incomplete decay effect has been shown to lead to overestimation of the amplitude average lifetime except in mono-exponential decays. An inverse model is then developed to correct the error from this effect and the theoretical simulations are tested by experimental results.
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Affiliation(s)
- Regina Won Kay Leung
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada
- Institute of Biomaterials & Biomedical Engineering, University of Toronto,164 College Street, Toronto, Ontario M5S 3G9, Canada
- Contributed equally
| | - Shu-Chi Allison Yeh
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada
- Contributed equally
| | - Qiyin Fang
- Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada
- School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada
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28
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Patel GS, Kiuchi T, Lawler K, Ofo E, Fruhwirth GO, Kelleher M, Shamil E, Zhang R, Selvin PR, Santis G, Spicer J, Woodman N, Gillett CE, Barber PR, Vojnovic B, Kéri G, Schaeffter T, Goh V, O'Doherty MJ, Ellis PA, Ng T. The challenges of integrating molecular imaging into the optimization of cancer therapy. Integr Biol (Camb) 2011; 3:603-31. [PMID: 21541433 DOI: 10.1039/c0ib00131g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We review novel, in vivo and tissue-based imaging technologies that monitor and optimize cancer therapeutics. Recent advances in cancer treatment centre around the development of targeted therapies and personalisation of treatment regimes to individual tumour characteristics. However, clinical outcomes have not improved as expected. Further development of the use of molecular imaging to predict or assess treatment response must address spatial heterogeneity of cancer within the body. A combination of different imaging modalities should be used to relate the effect of the drug to dosing regimen or effective drug concentration at the local site of action. Molecular imaging provides a functional and dynamic read-out of cancer therapeutics, from nanometre to whole body scale. At the whole body scale, an increase in the sensitivity and specificity of the imaging probe is required to localise (micro)metastatic foci and/or residual disease that are currently below the limit of detection. The use of image-guided endoscopic biopsy can produce tumour cells or tissues for nanoscopic analysis in a relatively patient-compliant manner, thereby linking clinical imaging to a more precise assessment of molecular mechanisms. This multimodality imaging approach (in combination with genetics/genomic information) could be used to bridge the gap between our knowledge of mechanisms underlying the processes of metastasis, tumour dormancy and routine clinical practice. Treatment regimes could therefore be individually tailored both at diagnosis and throughout treatment, through monitoring of drug pharmacodynamics providing an early read-out of response or resistance.
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Affiliation(s)
- G S Patel
- Richard Dimbleby Department of Cancer Research, Randall Division & Division of Cancer Studies, King's College London, Guy's Medical School Campus, London, SE1 1UL, UK.
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29
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Kumar S, Alibhai D, Margineanu A, Laine R, Kennedy G, McGinty J, Warren S, Kelly D, Alexandrov Y, Munro I, Talbot C, Stuckey DW, Kimberly C, Viellerobe B, Lacombe F, Lam EWF, Taylor H, Dallman MJ, Stamp G, Murray EJ, Stuhmeier F, Sardini A, Katan M, Elson DS, Neil MAA, Dunsby C, French PMW. FLIM FRET technology for drug discovery: automated multiwell-plate high-content analysis, multiplexed readouts and application in situ. Chemphyschem 2011; 12:609-26. [PMID: 21337485 PMCID: PMC3084521 DOI: 10.1002/cphc.201000874] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Revised: 12/07/2010] [Indexed: 11/10/2022]
Abstract
A fluorescence lifetime imaging (FLIM) technology platform intended to read out changes in Förster resonance energy transfer (FRET) efficiency is presented for the study of protein interactions across the drug-discovery pipeline. FLIM provides a robust, inherently ratiometric imaging modality for drug discovery that could allow the same sensor constructs to be translated from automated cell-based assays through small transparent organisms such as zebrafish to mammals. To this end, an automated FLIM multiwell-plate reader is described for high content analysis of fixed and live cells, tomographic FLIM in zebrafish and FLIM FRET of live cells via confocal endomicroscopy. For cell-based assays, an exemplar application reading out protein aggregation using FLIM FRET is presented, and the potential for multiple simultaneous FLIM (FRET) readouts in microscopy is illustrated.
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Affiliation(s)
- Sunil Kumar
- Photonics Group, Department of Physics, Imperial College London, London SW7 2AZ, UK.
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30
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Fruhwirth GO, Fernandes LP, Weitsman G, Patel G, Kelleher M, Lawler K, Brock A, Poland SP, Matthews DR, Kéri G, Barber PR, Vojnovic B, Ameer‐Beg SM, Coolen ACC, Fraternali F, Ng T. How Förster Resonance Energy Transfer Imaging Improves the Understanding of Protein Interaction Networks in Cancer Biology. Chemphyschem 2011; 12:442-61. [DOI: 10.1002/cphc.201000866] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 01/07/2011] [Indexed: 01/22/2023]
Affiliation(s)
- Gilbert O. Fruhwirth
- Richard Dimbleby Department of Cancer Research, Division of Cancer Studies, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK), Fax: (+44) (0) 20 7848 6220, Fax: (+44) (0) 20 7848 8056
- Comprehensive Cancer Imaging Centre, New Hunt's House, Guy's Medical School Campus, NHH, SE1 1UL (UK)
| | - Luis P. Fernandes
- Randall Division of Cell & Molecular Biophysics, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK)
| | - Gregory Weitsman
- Richard Dimbleby Department of Cancer Research, Division of Cancer Studies, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK), Fax: (+44) (0) 20 7848 6220, Fax: (+44) (0) 20 7848 8056
| | - Gargi Patel
- Richard Dimbleby Department of Cancer Research, Division of Cancer Studies, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK), Fax: (+44) (0) 20 7848 6220, Fax: (+44) (0) 20 7848 8056
| | - Muireann Kelleher
- Richard Dimbleby Department of Cancer Research, Division of Cancer Studies, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK), Fax: (+44) (0) 20 7848 6220, Fax: (+44) (0) 20 7848 8056
| | - Katherine Lawler
- Comprehensive Cancer Imaging Centre, New Hunt's House, Guy's Medical School Campus, NHH, SE1 1UL (UK)
| | - Adrian Brock
- Richard Dimbleby Department of Cancer Research, Division of Cancer Studies, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK), Fax: (+44) (0) 20 7848 6220, Fax: (+44) (0) 20 7848 8056
| | - Simon P. Poland
- Comprehensive Cancer Imaging Centre, New Hunt's House, Guy's Medical School Campus, NHH, SE1 1UL (UK)
| | - Daniel R. Matthews
- Richard Dimbleby Department of Cancer Research, Division of Cancer Studies, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK), Fax: (+44) (0) 20 7848 6220, Fax: (+44) (0) 20 7848 8056
| | - György Kéri
- Vichem Chemie Research Ltd. Herman Ottó utca 15, Budapest, Hungary and Pathobiochemistry Research Group of Hungarian Academy of Science, Semmelweis University, Budapest, 1444 Bp 8. POB 260 (Hungary)
| | - Paul R. Barber
- Gray Institute for Radiation Oncology & Biology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, OX3 7DQ (UK)
| | - Borivoj Vojnovic
- Randall Division of Cell & Molecular Biophysics, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK)
- Gray Institute for Radiation Oncology & Biology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, OX3 7DQ (UK)
| | - Simon M. Ameer‐Beg
- Richard Dimbleby Department of Cancer Research, Division of Cancer Studies, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK), Fax: (+44) (0) 20 7848 6220, Fax: (+44) (0) 20 7848 8056
- Randall Division of Cell & Molecular Biophysics, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK)
| | - Anthony C. C. Coolen
- Randall Division of Cell & Molecular Biophysics, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK)
- Department of Mathematics, King's College London, Strand Campus, London, WC2R 2LS (UK)
| | - Franca Fraternali
- Randall Division of Cell & Molecular Biophysics, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK)
| | - Tony Ng
- Richard Dimbleby Department of Cancer Research, Division of Cancer Studies, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK), Fax: (+44) (0) 20 7848 6220, Fax: (+44) (0) 20 7848 8056
- Randall Division of Cell & Molecular Biophysics, King's College London, Guy's Medical School Campus, NHH, SE1 1UL (UK)
- Comprehensive Cancer Imaging Centre, New Hunt's House, Guy's Medical School Campus, NHH, SE1 1UL (UK)
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