1
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Ko J, Lucas K, Kohler R, Halabi EA, Wilkovitsch M, Carlson JCT, Weissleder R. In Vivo Click Chemistry Enables Multiplexed Intravital Microscopy. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2200064. [PMID: 35750648 PMCID: PMC9405492 DOI: 10.1002/advs.202200064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 04/25/2022] [Indexed: 05/14/2023]
Abstract
The ability to observe cells in live organisms is essential for understanding their function in complex in vivo milieus. A major challenge today has been the limited ability to perform higher multiplexing beyond four to six colors to define cell subtypes in vivo. Here, a click chemistry-based strategy is presented for higher multiplexed in vivo imaging in mouse models. The method uses a scission-accelerated fluorophore exchange (SAFE), which exploits a highly efficient bioorthogonal mechanism to completely remove fluorescent signal from antibody-labeled cells in vivo. It is shown that the SAFE-intravital microscopy imaging method allows 1) in vivo staining of specific cell types in dorsal and cranial window chambers of mice, 2) complete un-staining in minutes, 3) in vivo click chemistries at lower (µm) and thus non-toxic concentrations, and 4) the ability to perform in vivo cyclic imaging. The potential utility of the method is demonstrated by 12 color imaging of immune cells in live mice.
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Affiliation(s)
- Jina Ko
- Center for Systems BiologyMassachusetts General Hospital185 Cambridge St, CPZN 5206BostonMA02114USA
| | - Kilean Lucas
- Center for Systems BiologyMassachusetts General Hospital185 Cambridge St, CPZN 5206BostonMA02114USA
| | - Rainer Kohler
- Center for Systems BiologyMassachusetts General Hospital185 Cambridge St, CPZN 5206BostonMA02114USA
| | - Elias A. Halabi
- Center for Systems BiologyMassachusetts General Hospital185 Cambridge St, CPZN 5206BostonMA02114USA
| | - Martin Wilkovitsch
- Center for Systems BiologyMassachusetts General Hospital185 Cambridge St, CPZN 5206BostonMA02114USA
| | - Jonathan C. T. Carlson
- Center for Systems BiologyMassachusetts General Hospital185 Cambridge St, CPZN 5206BostonMA02114USA
- Department of MedicineMassachusetts General HospitalHarvard Medical SchoolBostonMA02114USA
| | - Ralph Weissleder
- Center for Systems BiologyMassachusetts General Hospital185 Cambridge St, CPZN 5206BostonMA02114USA
- Department of Systems BiologyHarvard Medical School200 Longwood AveBostonMA02115USA
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2
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Haider M, Zaki KZ, El Hamshary MR, Hussain Z, Orive G, Ibrahim HO. Polymeric nanocarriers: A promising tool for early diagnosis and efficient treatment of colorectal cancer. J Adv Res 2022; 39:237-255. [PMID: 35777911 PMCID: PMC9263757 DOI: 10.1016/j.jare.2021.11.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 11/03/2021] [Accepted: 11/17/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Colorectal cancer (CRC) is the third most prevalent type of cancer for incidence and second for mortality worldwide. Late diagnosis and inconvenient and expensive current diagnostic tools largely contribute to the progress of the disease. The use of chemotherapy in the management of CRC significantly reduces tumor growth, metastasis, and morbidity rates. However, poor solubility, low cellular uptake, nonspecific distribution, multiple drug resistance and unwanted adverse effects are still among the major drawbacks of chemotherapy that limit its clinical significance in the treatment of CRC. Owing to their remarkable advantages over conventional therapies, the use of nanotechnology-based delivery systems especially polymeric nanocarriers (PNCs) has revolutionized many fields including disease diagnosis and drug delivery. AIM OF REVIEW In this review, we shed the light on the current status of using PNCs in the diagnosis and treatment of CRC with a special focus on targeting strategies, surface modifications and safety concerns for different types of PNCs in colonic cancer delivery. KEY SCIENTIFIC CONCEPTS OF REVIEW The review explores the current progress on the use of PNCs in the diagnosis and treatment of CRC with a special focus on the role of PNCs in improvement of cellular uptake, drug targeting and co-delivery of chemotherapeutic agents. Possible toxicity and biocompatibility issues related to the use of PNCs and imitations and future recommendation for the use of those smart carriers in the diagnosis and treatment of CRC are also discussed.
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Affiliation(s)
- Mohamed Haider
- Department of Pharmaceutics and Pharmaceutical Technology, College of Pharmacy, University of Sharjah, Sharjah 27272, United Arab Emirates; Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo 71526, Egypt.
| | - Khaled Zaki Zaki
- Department of Pharmaceutics and Pharmaceutical Technology, College of Pharmacy, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Mariam Rafat El Hamshary
- Department of Pharmaceutics and Pharmaceutical Technology, College of Pharmacy, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Zahid Hussain
- Department of Pharmaceutics and Pharmaceutical Technology, College of Pharmacy, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Gorka Orive
- NanoBioCel Group, Laboratory of Pharmaceutics, School of Pharmacy, University of the Basque Country (UPV/EHU), Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain; Bioaraba, NanoBioCel Research Group, Vitoria-Gasteiz, Spain; Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Vitoria-Gasteiz, Spain
| | - Haidy Osama Ibrahim
- Department of Pharmaceutics and Pharmaceutical Technology, College of Pharmacy, University of Sharjah, Sharjah 27272, United Arab Emirates
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3
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Waldner MJ, Neurath MF. Molecular Endoscopy for the Diagnosis and Therapeutic Monitoring of Colorectal Cancer. Front Oncol 2022; 12:835256. [PMID: 35280747 PMCID: PMC8913894 DOI: 10.3389/fonc.2022.835256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 01/26/2022] [Indexed: 11/23/2022] Open
Abstract
Colorectal cancer (CRC) is one of the leading causes of cancer related death in the western world. Its successful treatment requires early detection and removal of precursor lesions as well as individualized treatment of advanced disease. During recent years, molecular imaging techniques have shown promising results to improve current clinical practice. For instance, molecular endoscopy resulted in higher detection rates of precursors in comparison to conventional endoscopy in preclinical and clinical studies. Molecular confocal endomicroscopy allowed a further classification of suspect lesions as well as the prediction and monitoring of the therapeutic response. In this review, we summarize recent achievements for molecular imaging of CRC in preclinical studies, initial clinical trials and the remaining challenges for future translation into clinical practice.
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Affiliation(s)
- Maximilian J Waldner
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.,Deutsches Zentrum Immuntherapie (DZI), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Markus F Neurath
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.,Deutsches Zentrum Immuntherapie (DZI), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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4
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Abstract
Cysteine cathepsins are proteases critical in physiopathological processes and show potential as targets or biomarkers for diseases and medical conditions. The 11 members of the cathepsin family are redundant in some cases but remarkably independent of others, demanding the development of both pan-cathepsin targeting tools as well as probes that are selective for specific cathepsins with little off-target activity. This review addresses the diverse design strategies that have been employed to accomplish this tailored selectivity among cysteine cathepsin targets and the imaging modalities incorporated. The power of these diverse tools is contextualized by briefly highlighting the nature of a few prominent cysteine cathepsins, their involvement in select diseases, and the application of cathepsin imaging probes in research spanning basic biochemical studies to clinical applications.
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Affiliation(s)
- Kelton A Schleyer
- Department of Medicinal Chemistry, College of Pharmacy, University of Florida, 1345 Center Dr, Gainesville, FL 32610, USA.
| | - Lina Cui
- Department of Medicinal Chemistry, College of Pharmacy, University of Florida, 1345 Center Dr, Gainesville, FL 32610, USA.
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5
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Ham NS, Myung SJ. Endoscopic molecular imaging in inflammatory bowel disease. Intest Res 2021; 19:33-44. [PMID: 32299156 PMCID: PMC7873406 DOI: 10.5217/ir.2019.09175] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 01/31/2020] [Indexed: 12/12/2022] Open
Abstract
Molecular imaging is a technique for imaging the processes occurring in a living body at a molecular level in real-time, combining molecular cell biology with advanced imaging technologies using molecular probes and fluorescence. Gastrointestinal endoscopic molecular imaging shows great promise for improving the identification of neoplasms, providing characterization for patient stratification and assessing the response to molecular targeted therapy. In inflammatory bowel disease, endoscopic molecular imaging can be used to assess disease severity and predict therapeutic response and prognosis. Endoscopic molecular imaging is also able to visualize dysplasia in the presence of background inflammation. Several preclinical and clinical trials have evaluated endoscopic molecular imaging; however, this area is just beginning to evolve, and many issues have not been solved yet. In the future, it is expected that endoscopic molecular imaging will be of increasing interest among clinicians as a new technology for the identification and evaluation of colorectal neoplasm and colitis-associated cancer.
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Affiliation(s)
- Nam Seok Ham
- Department of Gastroenterology, Veterans Health Service Medical Center, Seoul, Korea
| | - Seung-Jae Myung
- Department of Gastroenterology, Digestive Diseases Research Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
- Correspondence to Seung-Jae Myung, Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea. Tel: +82-2-3010-3917, Fax: +82-2- 476-0824, E-mail:
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6
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Arndt N, Tran HDN, Zhang R, Xu ZP, Ta HT. Different Approaches to Develop Nanosensors for Diagnosis of Diseases. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:2001476. [PMID: 33344116 PMCID: PMC7740096 DOI: 10.1002/advs.202001476] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 07/18/2020] [Indexed: 05/09/2023]
Abstract
The success of clinical treatments is highly dependent on early detection and much research has been conducted to develop fast, efficient, and precise methods for this reason. Conventional methods relying on nonspecific and targeting probes are being outpaced by so-called nanosensors. Over the last two decades a variety of activatable sensors have been engineered, with a great diversity concerning the operating principle. Therefore, this review delineates the achievements made in the development of nanosensors designed for diagnosis of diseases.
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Affiliation(s)
- Nina Arndt
- Queensland Micro‐ and Nanotechnology CentreGriffith UniversityBrisbaneQueensland4111Australia
- Australian Institute for Bioengineering and Nanotechnologythe University of QueenslandBrisbaneQueensland4072Australia
- Department of BiotechnologyTechnische Universität BerlinBerlin10623Germany
| | - Huong D. N. Tran
- Queensland Micro‐ and Nanotechnology CentreGriffith UniversityBrisbaneQueensland4111Australia
- Australian Institute for Bioengineering and Nanotechnologythe University of QueenslandBrisbaneQueensland4072Australia
| | - Run Zhang
- Australian Institute for Bioengineering and Nanotechnologythe University of QueenslandBrisbaneQueensland4072Australia
| | - Zhi Ping Xu
- Australian Institute for Bioengineering and Nanotechnologythe University of QueenslandBrisbaneQueensland4072Australia
| | - Hang T. Ta
- Queensland Micro‐ and Nanotechnology CentreGriffith UniversityBrisbaneQueensland4111Australia
- Australian Institute for Bioengineering and Nanotechnologythe University of QueenslandBrisbaneQueensland4072Australia
- School of Environment and ScienceGriffith UniversityBrisbaneQueensland4111Australia
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7
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Hoffman A, Atreya R, Rath T, Neurath MF. Use of Fluorescent Dyes in Endoscopy and Diagnostic Investigation. Visc Med 2020; 36:95-103. [PMID: 32355666 DOI: 10.1159/000506241] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 01/15/2020] [Indexed: 12/25/2022] Open
Abstract
Background The advancement of innovative endoscopic technology in terms of improving the visualization of the mucosa has been of significant benefit. Summary Advancements in image resolution, software processing, and optical filter technology have resulted in several techniques complemental to traditional white light endoscopy. These new techniques provide a real-time optical diagnosis as well as virtual histology of detected lesions. Optical molecular imaging permits a functional assessment within cells. Key Message Optical molecular imaging provides an understanding of cellular processes and permits validation of the specificity of fluorescent tracers and the possibility of quantifying the signal.
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Affiliation(s)
- Arthur Hoffman
- Department of Internal Medicine III, Clinic Aschaffenburg-Alzenau, Aschaffenburg, Germany
| | - Raja Atreya
- First Department of Medicine, Friedrich Alexander University Erlangen-Nuernberg, Erlangen, Germany
| | - Timo Rath
- First Department of Medicine, Friedrich Alexander University Erlangen-Nuernberg, Erlangen, Germany
| | - Markus F Neurath
- First Department of Medicine, Friedrich Alexander University Erlangen-Nuernberg, Erlangen, Germany
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8
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Glover B, Teare J, Patel N. The Status of Advanced Imaging Techniques for Optical Biopsy of Colonic Polyps. Clin Transl Gastroenterol 2020; 11:e00130. [PMID: 32352708 PMCID: PMC7145035 DOI: 10.14309/ctg.0000000000000130] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 01/03/2020] [Indexed: 12/19/2022] Open
Abstract
The progressive miniaturization of photonic components presents the opportunity to obtain unprecedented microscopic images of colonic polyps in real time during endoscopy. This information has the potential to act as "optical biopsy" to aid clinical decision-making, including the possibility of adopting new paradigms such as a "resect and discard" approach for low-risk lesions. The technologies discussed in this review include confocal laser endomicroscopy, optical coherence tomography, multiphoton microscopy, Raman spectroscopy, and hyperspectral imaging. These are in different stages of development and clinical readiness, but all show the potential to produce reliable in vivo discrimination of different tissue types. A structured literature search of the imaging techniques for colorectal polyps has been conducted. The significant developments in endoscopic imaging were identified for each modality, and the status of current development was discussed. Of the advanced imaging techniques discussed, confocal laser endomicroscopy is in clinical use and, under optimal conditions with an experienced operator, can provide accurate histological assessment of tissue. The remaining techniques show potential for incorporation into endoscopic equipment and practice, although further component development is needed, followed by robust prospective validation of accuracy. Optical coherence tomography illustrates tissue "texture" well and gives good assessment of mucosal thickness and layers. Multiphoton microscopy produces high-resolution images at a subcellular resolution. Raman spectroscopy and hyperspectral imaging are less developed endoscopically but provide a tissue "fingerprint" which can distinguish between tissue types. Molecular imaging may become a powerful adjunct to other techniques, with its ability to precisely label specific molecules within tissue and thereby enhance imaging.
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Affiliation(s)
- Ben Glover
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Julian Teare
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Nisha Patel
- Department of Surgery and Cancer, Imperial College London, London, UK
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9
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Ahmed S, Galle PR, Neumann H. Molecular endoscopic imaging: the future is bright. Ther Adv Gastrointest Endosc 2019; 12:2631774519867175. [PMID: 31517311 PMCID: PMC6724493 DOI: 10.1177/2631774519867175] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 07/10/2019] [Indexed: 12/24/2022] Open
Abstract
The prediction and final survival rate of gastrointestinal cancers are dependent on the stage of disease. The ideal would be to detect those gastrointestinal lesions at early stage or even premalignant forms which are difficult to detect by conventional endoscopy with white light optical imaging as they show minimum or no changes in morphological characteristics and are thus left untreated. The introduction of molecular imaging has greatly changed the pattern for detecting gastrointestinal lesions from purely macroscopic structural imaging to the molecular level. It allows microscopic examination of the gastrointestinal mucosa with endoscopy after the topical or systemic application of molecular probes. In recent years, major advancements in endoscopic instruments and specific molecular probes have been achieved. This review focuses on the current status of endoscopic imaging and highlights the application of molecular imaging in gastrointestinal and hepatic disease in the context of diagnosis and therapy based on recently published literature in this field. We also discuss the challenges of molecular endoscopic imaging, its future directions and potential that could have a tremendous impact on endoscopic research and clinical practice in future.
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Affiliation(s)
- Shakil Ahmed
- Department of Interdisciplinary Endoscopy, I. Medical Clinic and Polyclinic, University Hospital Mainz, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Peter R Galle
- Department of Interdisciplinary Endoscopy, I. Medical Clinic and Polyclinic, University Hospital Mainz, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Helmut Neumann
- Department of Interdisciplinary Endoscopy, I. Medical Clinic and Polyclinic, University Hospital Mainz, Johannes Gutenberg University Mainz, Mainz, Germany
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10
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Kopansky-Groisman E, Kogan-Zviagin I, Sella-Tavor O, Oron-Herman M, David A. Near-Infrared Fluorescent Activated Polymeric Probe for Imaging Intraluminal Colorectal Cancer Tumors. Biomacromolecules 2019; 20:3547-3556. [PMID: 31381303 DOI: 10.1021/acs.biomac.9b00806] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Detection and removal of preneoplastic tumors is crucial for successful colorectal cancer (CRC) therapy. Here we describe the design of a Cathepsin B (CB)-activated polymeric probe, P-(GGFLGK-IR783), for imaging CRC tumors established by intrarectal or subcutaneous (s.c.) implantation of human colon cancer cells (SW-480 and HT-29) in mice. Multiple copies of the near-infrared fluorescent (NIRF) dye IR783 were attached to a single HPMA copolymer backbone via a CB-cleavable linker (GFLG), and the influence of the dye loading on the fluorescence quenching and activation by CB was assessed in vitro, ex vivo, and in vivo. The optimal dose and dosing regimen of P-(GGFLGK-IR783) for colonic tumor detection was determined. Increasing the IR783 loading in the copolymer from 2.5 to 20 mol % resulted in quenching of the fluorescence signal that was activated in vitro by the action of CB from different origins. Following intravenous administration, P-(GGFLGK-IR783)7.5% preferentially accumulated in intrarectal and s.c. implanted tumors, allowing tumor visualization after 4 h and even 48 h postadministration. Activation of P-(GGFLGK-IR783)7.5% by CB was clearly detected in s.c. implanted tumors, revealing about a 4-fold increase in the fluorescence signal in tumors vs healthy colon tissue. The probe containing the CB-cleavable linker produced higher fluorescence signal intensity in tumors, relative to the noncleavable probe. These results indicate that P-(GGFLGK-IR783)7.5% may aid in detecting CRC tumors and can help to guide selective removal of polyps during colonoscopic procedures.
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Affiliation(s)
- Eva Kopansky-Groisman
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences , Ben-Gurion University of the Negev , Beer-Sheva 84105 , Israel
| | - Inga Kogan-Zviagin
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences , Ben-Gurion University of the Negev , Beer-Sheva 84105 , Israel
| | | | - Mor Oron-Herman
- Advanced Technology Center, Sheba Medical Center , Tel-Hashomer 52621 , Israel
| | - Ayelet David
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences , Ben-Gurion University of the Negev , Beer-Sheva 84105 , Israel
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11
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Bogdanov AA, Solovyev ID, Savitsky AP. Sensors for Proteolytic Activity Visualization and Their Application in Animal Models of Human Diseases. BIOCHEMISTRY (MOSCOW) 2019; 84:S1-S18. [PMID: 31213192 DOI: 10.1134/s0006297919140013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Various sensors designed for optical and photo(opto)acoustic imaging in living systems are becoming essential components of basic and applied biomedical research. Some of them including those developed for determining enzyme activity in vivo are becoming commercially available. These sensors can be used for various fluorescent signal detection methods: from whole body tomography to endoscopy with miniature cameras. Sensor molecules including enzyme-cleavable macromolecules carrying multiple quenched near-infrared fluorophores are able to deliver their payload in vivo and have long circulation time in bloodstream enabling detection of enzyme activity for extended periods of time at low doses of these sensors. In the future, more effective "activated" probes are expected to become available with optimized sensitivity to enzymatic activity, spectral characteristics suitable for intraoperative imaging of surgical field, biocompatibility and lack of immunogenicity and toxicity. New in vivo optical imaging methods such as the fluorescence lifetime and photo(opto)acoustic imaging will contribute to early diagnosis of human diseases. The use of sensors for in vivo optical imaging will include more extensive preclinical applications of experimental therapies. At the same time, the ongoing development and improvement of optical signal detectors as well as the availability of biologically inert and highly specific fluorescent probes will further contribute to the introduction of fluorescence imaging into the clinic.
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Affiliation(s)
- A A Bogdanov
- University of Massachusetts Medical School, Department of Radiology, Laboratory of Molecular Imaging Probes, Worcester, MA 01655, USA. .,A. N. Bach Institute of Biochemistry, Federal Research Center "Fundamentals of Biotechnology", Russian Academy of Sciences, Laboratory of Molecular Imaging, Moscow, 119071, Russia.,Lomonosov Moscow State University, Faculty of Bioengineering and Bioinformatics, Moscow, 119991, Russia
| | - I D Solovyev
- A. N. Bach Institute of Biochemistry, Federal Research Center "Fundamentals of Biotechnology", Russian Academy of Sciences, Laboratory of Molecular Imaging, Moscow, 119071, Russia.,A. N. Bach Institute of Biochemistry, Fundamentals of Biotechnology Federal Research Center, Russian Academy of Sciences, Laboratory of Physical Biochemistry, Moscow, 119071, Russia
| | - A P Savitsky
- A. N. Bach Institute of Biochemistry, Federal Research Center "Fundamentals of Biotechnology", Russian Academy of Sciences, Laboratory of Molecular Imaging, Moscow, 119071, Russia.,A. N. Bach Institute of Biochemistry, Fundamentals of Biotechnology Federal Research Center, Russian Academy of Sciences, Laboratory of Physical Biochemistry, Moscow, 119071, Russia
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12
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Ahmed S, Strand S, Weinmann-Menke J, Urbansky L, Galle PR, Neumann H. Molecular endoscopic imaging in cancer. Dig Endosc 2018; 30:719-729. [PMID: 29846982 DOI: 10.1111/den.13199] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 05/21/2018] [Indexed: 12/14/2022]
Abstract
Cancer is one of the major causes of death in both the USA and Europe. Molecular imaging is a novel field that is revolutionizing cancer management. It is based on the molecular signature of cells in order to study the human body both in normal and diseased conditions. The emergence of molecular imaging has been driven by the difficulties associated with cancer detection, particularly early-stage premalignant lesions which are often unnoticed as a result of minimal or no structural changes. Endoscopic surveillance is the standard method for early-stage cancer detection. In addition to recent major advancements in endoscopic instruments, significant progress has been achieved in the exploration of highly specific molecular probes and the combination of both will permit significant improvement of patient care. In this review, we provide an outline of the current status of endoscopic imaging and focus on recent applications of molecular imaging in gastrointestinal, hepatic and other cancers in the context of detection, targeted therapy and personalized medicine. As new imaging agents have the potential to broadly expand our cancer diagnostic capability, we will also present an overview of the main types of optical molecular probes with their pros and cons. We conclude by discussing the challenges and future prospects of the field.
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Affiliation(s)
- Shakil Ahmed
- Department of Interdisciplinary Endoscopy, I. Medical Clinic and Polyclinic, University Hospital Mainz, Mainz, Germany
| | - Susanne Strand
- Department of Interdisciplinary Endoscopy, I. Medical Clinic and Polyclinic, University Hospital Mainz, Mainz, Germany
| | - Julia Weinmann-Menke
- Department of Interdisciplinary Endoscopy, I. Medical Clinic and Polyclinic, University Hospital Mainz, Mainz, Germany
| | - Lana Urbansky
- Department of Interdisciplinary Endoscopy, I. Medical Clinic and Polyclinic, University Hospital Mainz, Mainz, Germany
| | - Peter R Galle
- Department of Interdisciplinary Endoscopy, I. Medical Clinic and Polyclinic, University Hospital Mainz, Mainz, Germany
| | - Helmut Neumann
- Department of Interdisciplinary Endoscopy, I. Medical Clinic and Polyclinic, University Hospital Mainz, Mainz, Germany
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13
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Marelli G, Avigni R, Allavena P, Garlanda C, Mantovani A, Doni A, Erreni M. Optical in vivo imaging detection of preclinical models of gut tumors through the expression of integrin αVβ3. Oncotarget 2018; 9:31380-31396. [PMID: 30140377 PMCID: PMC6101137 DOI: 10.18632/oncotarget.25826] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 07/12/2018] [Indexed: 12/22/2022] Open
Abstract
Optical imaging and Fluorescent Molecular Tomography (FMT) are becoming increasingly important for the study of different preclinical models of cancer, providing a non-invasive method for the evaluation of tumor progression in a relatively simple and fast way. Intestinal tumors, in particular colorectal cancer (CRC), represent a major cause of cancer-related death in Western countries: despite the presence of a number of preclinical models of intestinal carcinogenesis, there is a paucity of information about the possibility to detect intestinal tumors using fluorescent probes and optical in vivo imaging. Herein, we identify the detection of integrin αvβ3 by FMT and optical imaging as an effective approach to assess the occurrence and progression of intestinal carcinogenesis in genetic and chemically-induced mouse models. For this purpose, a commercially available probe (IntegriSense), recognizing integrin αvβ3, was injected in APC+/min mice bearing small intestinal adenomas or CRC: FMT analysis allowed a specific tumor detection, further confirmed by subsequent ex vivo imaging or conventional histology. In addition, IntegriSense detection by FMT allowed the longitudinal monitoring of tumor growth. Taken together, our data indicate the possibility to use integrin αvβ3 for the visualization of intestinal tumors in preclinical models.
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Affiliation(s)
- Giulia Marelli
- IRCCS Humanitas Clinical and Research Center, Rozzano, Milan, Italy.,Current address: Center for Molecular Oncology, Bart Cancer Institute, Queen Mary University of London, London, UK
| | - Roberta Avigni
- IRCCS Humanitas Clinical and Research Center, Rozzano, Milan, Italy
| | - Paola Allavena
- IRCCS Humanitas Clinical and Research Center, Rozzano, Milan, Italy.,Humanitas University, Rozzano, Milan, Italy
| | - Cecilia Garlanda
- IRCCS Humanitas Clinical and Research Center, Rozzano, Milan, Italy.,Humanitas University, Rozzano, Milan, Italy
| | - Alberto Mantovani
- IRCCS Humanitas Clinical and Research Center, Rozzano, Milan, Italy.,Humanitas University, Rozzano, Milan, Italy.,The William Harvey Research Institute, Queen Mary University of London, London, UK
| | - Andrea Doni
- IRCCS Humanitas Clinical and Research Center, Rozzano, Milan, Italy
| | - Marco Erreni
- IRCCS Humanitas Clinical and Research Center, Rozzano, Milan, Italy
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14
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Ibrahim AB, Alaraby Salem M, Fasih TW, Brown A, Sakr TM. Radioiodinated doxorubicin as a new tumor imaging model: preparation, biological evaluation, docking and molecular dynamics. J Radioanal Nucl Chem 2018. [DOI: 10.1007/s10967-018-6013-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Waldner MJ, Rath T, Schürmann S, Bojarski C, Atreya R. Imaging of Mucosal Inflammation: Current Technological Developments, Clinical Implications, and Future Perspectives. Front Immunol 2017; 8:1256. [PMID: 29075256 PMCID: PMC5641553 DOI: 10.3389/fimmu.2017.01256] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Accepted: 09/21/2017] [Indexed: 12/12/2022] Open
Abstract
In recent years, various technological developments markedly improved imaging of mucosal inflammation in patients with inflammatory bowel diseases. Although technological developments such as high-definition-, chromo-, and autofluorescence-endoscopy led to a more precise and detailed assessment of mucosal inflammation during wide-field endoscopy, probe-based and stationary confocal laser microscopy enabled in vivo real-time microscopic imaging of mucosal surfaces within the gastrointestinal tract. Through the use of fluorochromes with specificity against a defined molecular target combined with endoscopic techniques that allow ultrastructural resolution, molecular imaging enables in vivo visualization of single molecules or receptors during endoscopy. Molecular imaging has therefore greatly expanded the clinical utility and applications of modern innovative endoscopy, which include the diagnosis, surveillance, and treatment of disease as well as the prediction of the therapeutic response of individual patients. Furthermore, non-invasive imaging techniques such as computed tomography, magnetic resonance imaging, scintigraphy, and ultrasound provide helpful information as supplement to invasive endoscopic procedures. In this review, we provide an overview on the current status of advanced imaging technologies for the clinical non-invasive and endoscopic evaluation of mucosal inflammation. Furthermore, the value of novel methods such as multiphoton microscopy, optoacoustics, and optical coherence tomography and their possible future implementation into clinical diagnosis and evaluation of mucosal inflammation will be discussed.
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Affiliation(s)
- Maximilian J Waldner
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Timo Rath
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christian Bojarski
- Department of Gastroenterology, Infectiology and Rheumatology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Raja Atreya
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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16
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Abdulla MH, Valli-Mohammed MA, Al-Khayal K, Al Shkieh A, Zubaidi A, Ahmad R, Al-Saleh K, Al-Obeed O, McKerrow J. Cathepsin B expression in colorectal cancer in a Middle East population: Potential value as a tumor biomarker for late disease stages. Oncol Rep 2017; 37:3175-3180. [PMID: 28440429 PMCID: PMC5442396 DOI: 10.3892/or.2017.5576] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 02/02/2017] [Indexed: 02/05/2023] Open
Abstract
Cathepsin B (CTSB), is a cysteine protease belonging to the cathepsin (Clan CA) family. The diagnostic and prognostic significance of increased CTSB in the serum of cancer patients have been evaluated for some tumor types. CTSB serum and protein levels have also been reported previously in colorectal cancer (CRC) with contradictory results. The aim of the present study was to investigate CTSB expression in CRC patients and the association of CTSB expression with various tumor stages in a Middle East population. Serum CTSB levels were evaluated in 70 patients and 20 healthy control subjects using enzyme-linked immunosorbant assay (ELISA) technique. CTSB expression was determined in 100 pairs of CRC tumor and adjacent normal colonic tissue using quantitative PCR for mRNA levels. Detection of CTSB protein expression in tissues was carried out using both immunohistochemistry and western blotting techniques. ELISA analysis showed that in sera obtained from CRC patients, the CTSB concentration was significantly higher in late stage patients with lymph node metastases when compared to early stage patients with values of 2.9 and 0.33 ng/ml, respectively (P=0.001). The majority of tumors studied had detectable CTSB protein expression with significant increased positive staining in tumors cells when compared with matched normal colon subjects (P=0.006). The mRNA expression in early stage CRC compared to late stage CRC was 0.04±0.01 and 0.07±0.02, respectively. Increased mRNA expression was more frequently observed in the advanced cancer stages with lymph node metastases when compared with the control (P=0.002). Mann-Whitney test and paired t-test were used to compare serum CTSB and mRNA levels in early and late tumor stage. A subset of four paired tissue extracts were analyzed by western blotting. The result confirmed a consistent increase in the CTSB protein expression level in tumor tissues compared with that noted in the adjacent normal mucosal cells. These findings indicate that CTSB may be an important prognostic biomarker for late stage CRC and cases with lymph node metastases in the Middle Eastern population. Monitoring serum CTSB in CRC patients may predict and/or diagnose cases with lymph node metastases.
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Affiliation(s)
- Maha-Hamadien Abdulla
- Colorectal Research Chair, Department of Surgery, King Khalid University Hospital, King Saud University, College of Medicine, Riyadh 11472, Kingdom of Saudi Arabia
| | - Mansoor-Ali Valli-Mohammed
- Colorectal Research Chair, Department of Surgery, King Khalid University Hospital, King Saud University, College of Medicine, Riyadh 11472, Kingdom of Saudi Arabia
| | - Khayal Al-Khayal
- Colorectal Research Chair, Department of Surgery, King Khalid University Hospital, King Saud University, College of Medicine, Riyadh 11472, Kingdom of Saudi Arabia
| | - Abdulmalik Al Shkieh
- Department of Pathology, King Khalid University Hospital, King Saud University, Riyadh 11472, Kingdom of Saudi Arabia
| | - Ahmad Zubaidi
- Colorectal Research Chair, Department of Surgery, King Khalid University Hospital, King Saud University, College of Medicine, Riyadh 11472, Kingdom of Saudi Arabia
| | - Rehan Ahmad
- Colorectal Research Chair, Department of Surgery, King Khalid University Hospital, King Saud University, College of Medicine, Riyadh 11472, Kingdom of Saudi Arabia
| | - Khalid Al-Saleh
- Medical Oncology Unit, Department of Medicine, King Saud University, Riyadh 11461, Kingdom of Saudi Arabia
| | - Omar Al-Obeed
- Colorectal Research Chair, Department of Surgery, King Khalid University Hospital, King Saud University, College of Medicine, Riyadh 11472, Kingdom of Saudi Arabia
| | - James McKerrow
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093, USA
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17
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Tang Q, Wang J, Frank A, Lin J, Li Z, Chen CW, Jin L, Wu T, Greenwald BD, Mashimo H, Chen Y. Depth-resolved imaging of colon tumor using optical coherence tomography and fluorescence laminar optical tomography. BIOMEDICAL OPTICS EXPRESS 2016; 7:5218-5232. [PMID: 28018738 PMCID: PMC5175565 DOI: 10.1364/boe.7.005218] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 11/16/2016] [Accepted: 11/16/2016] [Indexed: 05/02/2023]
Abstract
Early detection of neoplastic changes remains a critical challenge in clinical cancer diagnosis and treatment. Many cancers arise from epithelial layers such as those of the gastrointestinal (GI) tract. Current standard endoscopic technology is difficult to detect the subsurface lesions. In this research, we investigated the feasibility of a novel multi-modal optical imaging approach including high-resolution optical coherence tomography (OCT) and high-sensitivity fluorescence laminar optical tomography (FLOT) for structural and molecular imaging. The C57BL/6J-ApcMin/J mice were imaged using OCT and FLOT, and the correlated histopathological diagnosis was obtained. Quantitative structural (scattering coefficient) and molecular (relative enzyme activity) parameters were obtained from OCT and FLOT images for multi-parametric analysis. This multi-modal imaging method has demonstrated the feasibility for more accurate diagnosis with 88.23% (82.35%) for sensitivity (specificity) compared to either modality alone. This study suggested that combining OCT and FLOT is promising for subsurface cancer detection, diagnosis, and characterization.
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Affiliation(s)
- Qinggong Tang
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Jianting Wang
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Aaron Frank
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Jonathan Lin
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Zhifang Li
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
- Key Laboratory of Optoelectronic Science and Technology for Medicine, Ministry of Education, College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 350007, China
| | - Chao-wei Chen
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Lily Jin
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Tongtong Wu
- Department of Biostatistics and Computational Biology, University of Rochester, Rochester, NY 14642, USA
| | - Bruce D. Greenwald
- Division of Gastroenterology and Hepatology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Hiroshi Mashimo
- Department of Medicine, Veterans Affairs Boston Healthcare System, Harvard Medical School, West Roxbury, MA 02132, USA
| | - Yu Chen
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
- Key Laboratory of Optoelectronic Science and Technology for Medicine, Ministry of Education, College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 350007, China
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18
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De Grand AM, Frangioni JV. An Operational Near-Infrared Fluorescence Imaging System Prototype for Large Animal Surgery. Technol Cancer Res Treat 2016; 2:553-62. [PMID: 14640766 DOI: 10.1177/153303460300200607] [Citation(s) in RCA: 142] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Near-infrared (NIR) fluorescence imaging has the potential to revolutionize human cancer surgery by providing sensitive, specific, and real-time intraoperative visualization of normal and disease processes. We have previously introduced the concept of a low-cost, safe, and easy-to-use NIR fluorescence imaging system that permits the surgeon to “see” surgical anatomy and NIR fluorescence simultaneously, non-invasively, with high spatial resolution, in real-time, and without moving parts [Nakayama et al. Molecular Imaging 1, 365–377 (2002)]. In this study, we present an operational prototype designed specifically for use during large animal surgery. Such a system serves as a foundation for future clinical studies. We discuss technical considerations, and provide details of the implementation of subsystems related to excitation light, light collection, computer, and software. Using the prototype, and the clinically available NIR fluorophore indocyanine green, we demonstrate vascular imaging in 35 kg pigs. Cancer-specific applications of this imaging system include image-guided cancer resection with real-time assessment of surgical margins, image-guided sentinel lymph node mapping, intraoperative mapping of tumor and normal vasculature, image-guided avoidance of critical structures such as nerves, and intraoperative detection of occult metastases in the surgical field. Taken together, this study describes an optical imaging system engineered for eventual translation to the clinic.
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Affiliation(s)
- A M De Grand
- Division of Hematology/Oncology, Beth Israel Deaconess Medical Center, SL-B05, 330 Brookline Avenue, Boston, MA 02215, USA
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19
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Kumar ATN, Rice WL, López JC, Gupta S, Goergen CJ, Bogdanov AA. Substrate-based near-infrared imaging sensors enable fluorescence lifetime contrast via built-in dynamic fluorescence quenching elements. ACS Sens 2016; 1:427-436. [PMID: 28944290 PMCID: PMC5609830 DOI: 10.1021/acssensors.5b00252] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Enzymatic activity sensing in fluorescence lifetime (FLT) mode with "self-quenched" macromolecular near-infrared (NIR) sensors is a highly promising strategy for in vivo imaging of proteolysis. However, the mechanisms of FLT changes in such substrate-based NIR sensors have not yet been studied. We synthesized two types of sensors by linking the near-infrared fluorophore IRDye 800CW to macromolecular graft copolymers of methoxy polyethylene glycol and polylysine (MPEG-gPLL) with varying degrees of MPEGylation and studied their fragmentation induced by trypsin, elastase, plasmin and cathepsins (B,S,L,K). We determined that the efficiency of such NIR sensors in FLT mode depends on sensor composition. While MPEG-gPLL with a high degree of MPEGylation showed rapid (τ1/2=0.1-0.2 min) FLT increase (Δτ=0.25 ns) upon model proteinase-mediated hydrolysis in vivo, lower MPEGylation density resulted in no such FLT increase. Temperature-dependence of fluorescence de-quenching of NIR sensors pointed to a mixed dynamic/static-quenching mode of MPEG-gPLL-linked fluorophores. We further demonstrated that although the bulk of sensor-linked fluorophores were de-quenched due to the elimination of static quenching, proteolysis-mediated deletion of a fraction of short (8-10kD) negatively charged fragments of highly MPEGylated NIR sensor is the most likely event leading to a rapid FLT increase phenomenon in quenched NIR sensors. Therefore, the optimization of "built-in" dynamic quenching elements of macromolecular NIR sensors is a potential avenue for improving their response in FLT mode.
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Affiliation(s)
- Anand T. N. Kumar
- A. Martinos’ Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown MA 02129
| | - William L. Rice
- A. Martinos’ Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown MA 02129
| | - Jessica C. López
- Department of Radiology and the Laboratory of Molecular Imaging Probes, University of Massachusetts Medical School, Worcester, MA 01655
| | - Suresh Gupta
- Department of Radiology and the Laboratory of Molecular Imaging Probes, University of Massachusetts Medical School, Worcester, MA 01655
| | - Craig J. Goergen
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907
| | - Alexei A. Bogdanov
- Department of Radiology and the Laboratory of Molecular Imaging Probes, University of Massachusetts Medical School, Worcester, MA 01655
- The Chemical Biology Interface Program, University of Massachusetts Medical School, Worcester, MA 01655
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20
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Ji K, Heyza J, Cavallo-Medved D, Sloane BF. Pathomimetic cancer avatars for live-cell imaging of protease activity. Biochimie 2015; 122:68-76. [PMID: 26375517 DOI: 10.1016/j.biochi.2015.09.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 09/10/2015] [Indexed: 12/12/2022]
Abstract
Proteases are essential for normal physiology as well as multiple diseases, e.g., playing a causative role in cancer progression, including in tumor angiogenesis, invasion, and metastasis. Identification of dynamic alterations in protease activity may allow us to detect early stage cancers and to assess the efficacy of anti-cancer therapies. Despite the clinical importance of proteases in cancer progression, their functional roles individually and within the context of complex protease networks have not yet been well defined. These gaps in our understanding might be addressed with: 1) accurate and sensitive tools and methods to directly identify changes in protease activities in live cells, and 2) pathomimetic avatars for cancer that recapitulate in vitro the tumor in the context of its cellular and non-cellular microenvironment. Such avatars should be designed to facilitate mechanistic studies that can be translated to animal models and ultimately the clinic. Here, we will describe basic principles and recent applications of live-cell imaging for identification of active proteases. The avatars optimized by our laboratory are three-dimensional (3D) human breast cancer models in a matrix of reconstituted basement membrane (rBM). They are designated mammary architecture and microenvironment engineering (MAME) models as they have been designed to mimic the structural and functional interactions among cell types in the normal and cancerous human breast. We have demonstrated the usefulness of these pathomimetic avatars for following dynamic and temporal changes in cell:cell interactions and quantifying changes in protease activity associated with these interactions in real-time (4D). We also briefly describe adaptation of the avatars to custom-designed and fabricated tissue architecture and microenvironment engineering (TAME) chambers that enhance our ability to analyze concomitant changes in the malignant phenotype and the associated tumor microenvironment.
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Affiliation(s)
- Kyungmin Ji
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, MI 48201, USA.
| | - Joshua Heyza
- Cancer Biology Graduate Program, Wayne State University School of Medicine, Detroit, MI 48201, USA; Department of Oncology, Wayne State University School of Medicine, Detroit, MI 48201, USA.
| | - Dora Cavallo-Medved
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, MI 48201, USA; Department of Biological Sciences, University of Windsor, Windsor, Canada.
| | - Bonnie F Sloane
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, MI 48201, USA; Cancer Biology Graduate Program, Wayne State University School of Medicine, Detroit, MI 48201, USA; Department of Oncology, Wayne State University School of Medicine, Detroit, MI 48201, USA; Department of Biological Sciences, University of Windsor, Windsor, Canada.
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21
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Detection of colorectal polyps in humans using an intravenously administered fluorescent peptide targeted against c-Met. Nat Med 2015; 21:955-61. [DOI: 10.1038/nm.3641] [Citation(s) in RCA: 201] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 04/14/2014] [Indexed: 12/17/2022]
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22
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Zhang W, Ma Z, Du L, Li M. Design strategy for photoinduced electron transfer-based small-molecule fluorescent probes of biomacromolecules. Analyst 2015; 139:2641-9. [PMID: 24755654 DOI: 10.1039/c3an02379f] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
As the cardinal support of innumerable biological processes, biomacromolecules such as proteins, nucleic acids and polysaccharides are of importance to living systems. The key to understanding biological processes is to realize the role of these biomacromolecules in thte localization, distribution, conformation and interaction with other molecules. With the current development and adaptation of fluorescent technologies in biomedical and pharmaceutical fields, the fluorescence imaging (FLI) approach of using small-molecule fluorescent probes is becoming an up-to-the-minute method for the detection and monitoring of these imperative biomolecules in life sciences. However, conventional small-molecule fluorescent probes may provide undesirable results because of their intrinsic deficiencies such as low signal-to-noise ratio (SNR) and false-positive errors. Recently, small-molecule fluorescent probes with a photoinduced electron transfer (PET) "on/off" switch for biomacromolecules have been thoroughly considered. When recognized by the biomacromolecules, these probes turn on/off the PET switch and change the fluorescence intensity to present a high SNR result. It should be emphasized that these PET-based fluorescent probes could be advantageous for understanding the pathogenesis of various diseases caused by abnormal expression of biomacromolecules. The discussion of this successful strategy involved in this review will be a valuable guide for the further development of new PET-based small-molecule fluorescent probes for biomacromolecules.
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Affiliation(s)
- Wei Zhang
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology of Natural Products (MOE), School of Pharmacy, Shandong University, Jinan, Shandong 250012, China.
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23
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Bian B, Mongrain S, Cagnol S, Langlois MJ, Boulanger J, Bernatchez G, Carrier JC, Boudreau F, Rivard N. Cathepsin B promotes colorectal tumorigenesis, cell invasion, and metastasis. Mol Carcinog 2015; 55:671-87. [PMID: 25808857 PMCID: PMC4832390 DOI: 10.1002/mc.22312] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 02/05/2015] [Accepted: 02/21/2015] [Indexed: 12/14/2022]
Abstract
Cathepsin B is a cysteine proteinase that primarily functions as an endopeptidase within endolysosomal compartments in normal cells. However, during tumoral expansion, the regulation of cathepsin B can be altered at multiple levels, thereby resulting in its overexpression and export outside of the cell. This may suggest a possible role of cathepsin B in alterations leading to cancer progression. The aim of this study was to determine the contribution of intracellular and extracellular cathepsin B in growth, tumorigenesis, and invasion of colorectal cancer (CRC) cells. Results show that mRNA and activated levels of cathepsin B were both increased in human adenomas and in CRCs of all stages. Treatment of CRC cells with the highly selective and non‐permeant cathepsin B inhibitor Ca074 revealed that extracellular cathepsin B actively contributed to the invasiveness of human CRC cells while not essential for their growth in soft agar. Cathepsin B silencing by RNAi in human CRC cells inhibited their growth in soft agar, as well as their invasion capacity, tumoral expansion, and metastatic spread in immunodeficient mice. Higher levels of the cell cycle inhibitor p27Kip1 were observed in cathepsin B‐deficient tumors as well as an increase in cyclin B1. Finally, cathepsin B colocalized with p27Kip1 within the lysosomes and efficiently degraded the inhibitor. In conclusion, the present data demonstrate that cathepsin B is a significant factor in colorectal tumor development, invasion, and metastatic spreading and may, therefore, represent a potential pharmacological target for colorectal tumor therapy. © 2015 The Authors. Molecular Carcinogenesis, published by Wiley Periodicals, Inc.
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Affiliation(s)
- Benjamin Bian
- Department of Anatomy and Cell Biology, Cancer Research Pavilion, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Sébastien Mongrain
- Department of Anatomy and Cell Biology, Cancer Research Pavilion, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Sébastien Cagnol
- Department of Anatomy and Cell Biology, Cancer Research Pavilion, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Marie-Josée Langlois
- Department of Anatomy and Cell Biology, Cancer Research Pavilion, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Jim Boulanger
- Department of Anatomy and Cell Biology, Cancer Research Pavilion, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Gérald Bernatchez
- Gastroenterology Service, Department of Medicine, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Julie C Carrier
- Gastroenterology Service, Department of Medicine, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - François Boudreau
- Department of Anatomy and Cell Biology, Cancer Research Pavilion, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Nathalie Rivard
- Department of Anatomy and Cell Biology, Cancer Research Pavilion, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
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Charanya T, York T, Bloch S, Sudlow G, Liang K, Garcia M, Akers WJ, Rubin D, Gruev V, Achilefu S. Trimodal color-fluorescence-polarization endoscopy aided by a tumor selective molecular probe accurately detects flat lesions in colitis-associated cancer. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:126002. [PMID: 25473883 PMCID: PMC4255434 DOI: 10.1117/1.jbo.19.12.126002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 10/24/2014] [Indexed: 05/10/2023]
Abstract
Colitis-associated cancer (CAC) arises from premalignant flat lesions of the colon, which are difficult to detect with current endoscopic screening approaches. We have developed a complementary fluorescence and polarization reporting strategy that combines the unique biochemical and physical properties of dysplasia and cancer for real-time detection of these lesions. Using azoxymethane-dextran sodium sulfate (AOM-DSS) treated mice, which recapitulates human CAC and dysplasia, we show that an octapeptide labeled with a near-infrared (NIR) fluorescent dye selectively identified all precancerous and cancerous lesions. A new thermoresponsive sol-gel formulation allowed topical application of the molecular probe during endoscopy. This method yielded high contrast-to-noise ratios (CNR) between adenomatous tumors (20.6 ± 1.65) and flat lesions (12.1 ± 1.03) and surrounding uninvolved colon tissue versus CNR of inflamed tissues (1.62±0.42) Incorporation of nanowire-filtered polarization imaging into NIR fluorescence endoscopy shows a high depolarization contrast in both adenomatous tumors and flat lesions in CAC, reflecting compromised structural integrity of these tissues. Together, the real-time polarization imaging provides real-time validation of suspicious colon tissue highlighted by molecular fluorescence endoscopy.
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Affiliation(s)
- Tauseef Charanya
- Washington University in St. Louis, Department of Radiology, 4525 Scott Avenue, East Building, St. Louis, Missouri 63110, United States
- Washington University in St. Louis, Department of Biomedical Engineering, 1 Brookings Drive, St. Louis, Missouri 63110, United States
| | - Timothy York
- Washington University in St. Louis, Department of Computer Science and Engineering, 1 Brookings Drive, St. Louis, Missouri 63110, United States
| | - Sharon Bloch
- Washington University in St. Louis, Department of Radiology, 4525 Scott Avenue, East Building, St. Louis, Missouri 63110, United States
| | - Gail Sudlow
- Washington University in St. Louis, Department of Radiology, 4525 Scott Avenue, East Building, St. Louis, Missouri 63110, United States
| | - Kexian Liang
- Washington University in St. Louis, Department of Radiology, 4525 Scott Avenue, East Building, St. Louis, Missouri 63110, United States
| | - Missael Garcia
- Washington University in St. Louis, Department of Computer Science and Engineering, 1 Brookings Drive, St. Louis, Missouri 63110, United States
| | - Walter J. Akers
- Washington University in St. Louis, Department of Radiology, 4525 Scott Avenue, East Building, St. Louis, Missouri 63110, United States
| | - Deborah Rubin
- Washington University in St. Louis, Department of Medicine, 660 South Euclid Avenue, St. Louis, Missouri 63110, United States
| | - Viktor Gruev
- Washington University in St. Louis, Department of Computer Science and Engineering, 1 Brookings Drive, St. Louis, Missouri 63110, United States
| | - Samuel Achilefu
- Washington University in St. Louis, Department of Radiology, 4525 Scott Avenue, East Building, St. Louis, Missouri 63110, United States
- Washington University in St. Louis, Department of Biomedical Engineering, 1 Brookings Drive, St. Louis, Missouri 63110, United States
- Washington University in St. Louis, Department of Biochemistry and Molecular Biophysics, 660 South Euclid Avenue, St. Louis, Missouri 63110, United States
- Address all correspondence to: Samuel Achilefu, E-mail:
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25
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Edem PE, Czorny S, Valliant JF. Synthesis and Evaluation of Radioiodinated Acyloxymethyl Ketones as Activity-Based Probes for Cathepsin B. J Med Chem 2014; 57:9564-77. [PMID: 25360988 DOI: 10.1021/jm501357r] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Patricia E. Edem
- Department of Chemistry & Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Shannon Czorny
- Department of Chemistry & Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - John F. Valliant
- Department of Chemistry & Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
- Centre for Probe Development and Commercialization, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada
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26
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Abstract
PURPOSE OF REVIEW The introduction of novel molecular imaging modalities that can not only define disease states on the basis of structural changes and morphology, but also allow in-vivo visualization and characterization of molecular and biochemical alterations on a cellular level add a new dimension to our current diagnostic possibilities. The advents of innovative endoscopic devices coupled with the introduction of novel targeting ligands contribute to the recent advances made in the field of molecular imaging. The purpose of this review is to present and discuss the concepts and the potential of novel endoscopic imaging modalities for immune cell monitoring in the intestine. RECENT FINDINGS Recent progress concerning molecular imaging studies in animals and human patients implicates that this approach can be used to improve detection of mucosal lesions in wide-field imaging and for in-vivo characterization of the mucosa with the ultimate goal of assessing the likelihood of response to targeted therapy with biological agents. In particular, molecular endomicroscopy for assessment of mucosal immune responses ('immunoendoscopy') emerges as a novel approach for optimized endoscopic diagnosis and individualized therapy. SUMMARY Molecular imaging modalities in the intestine have the immediate potential to have an impact on current clinical practice and could therefore open new frontiers for clinical endoscopy and give hope for improved diagnosis and targeted therapies.
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Abstract
PURPOSE OF REVIEW Tumor growth elicits antigen-specific cytotoxic as well as immune suppressive responses. Interleukin-10 (IL-10) is a key immune-suppressive cytokine produced by regulatory T-cells and by helper T-cells. Here, we review pleiotropic functions of IL-10 that impact the immune pathology of cancer. RECENT FINDINGS The role of IL-10 in cancer has become less certain with the knowledge of its immune stimulatory functions. IL-10 is needed for T-helper cell functions, T-cell immune surveillance, and suppression of cancer-associated inflammation. By promoting tumor-specific immune surveillance and hindering pathogenic inflammation, IL-10 is emerging as a key cytokine in the battle of the host against cancer. SUMMARY IL-10 functions at the cross-roads of immune stimulation and immune suppression in cancer. Immunological mechanisms of action of IL-10 can be ultimately exploited to develop novel and effective cancer therapies.
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Hoetker MS, Goetz M. Molecular imaging in endoscopy. United European Gastroenterol J 2014; 1:84-92. [PMID: 24917945 DOI: 10.1177/2050640613483291] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Accepted: 02/18/2013] [Indexed: 02/06/2023] Open
Abstract
Molecular imaging focuses on the molecular signature of cells rather than morphological changes in the tissue. The need for this novel type of imaging arises from the often difficult detection and characterization especially of small and/or premalignant lesions. Molecular imaging specifically visualizes biological properties of a lesion and might thereby be able to close diagnostic gaps, e.g. when differentiating hyperplastic from neoplastic polyps or detecting the margins of intraepithelial neoplastic spread. Additionally, not only the detection and discrimination of lesions could be improved: based on the molecular features identified using molecular imaging, therapy regimens could be adjusted on the day of diagnosis to allow for personalized medicine and optimized care for each individual patient.
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Affiliation(s)
| | - Martin Goetz
- Universitätsklinikum Tübingen, Tübingen, Germany
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Han MS, Tung CH. Lessons learned from imaging mouse ovarian tumors: the route of probe injection makes a difference. Quant Imaging Med Surg 2014; 4:156-62. [PMID: 24914416 DOI: 10.3978/j.issn.2223-4292.2014.04.03] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 04/16/2014] [Indexed: 12/26/2022]
Abstract
Patients with ovarian cancer often develop small metastatic lesions in their peritoneal cavities. Fluorescent-imaging probes that can highlight these small lesions have significant value for guiding procedures and treatment decisions. In this animal study, we demonstrated that intraperitoneal (IP) delivery of a protease-sensitive fluorescent probe resulted in the labeling of all tumors regardless of their sizes with low background signals in organs. Conversely, intravenous (IV) injections of the probe resulted in high signals in most organs and large tumors (>5 mm) but not in any of the small lesions (<2 mm).
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Affiliation(s)
- Myung Shin Han
- 1 Molecular Imaging Innovations Institute, Department of Radiology, Weill Cornell Medical College, New York, USA ; 2 Department of Translational Imaging, Houston Methodist Research Institute, Houston, TX, USA ; 3 Department of Obstetrics and Gynecology, Houston Methodist Hospital, Houston, TX, USA
| | - Ching-Hsuan Tung
- 1 Molecular Imaging Innovations Institute, Department of Radiology, Weill Cornell Medical College, New York, USA ; 2 Department of Translational Imaging, Houston Methodist Research Institute, Houston, TX, USA ; 3 Department of Obstetrics and Gynecology, Houston Methodist Hospital, Houston, TX, USA
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Subramanian V, Ragunath K. Advanced endoscopic imaging: a review of commercially available technologies. Clin Gastroenterol Hepatol 2014; 12:368-76.e1. [PMID: 23811245 DOI: 10.1016/j.cgh.2013.06.015] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Revised: 05/17/2013] [Accepted: 06/03/2013] [Indexed: 02/07/2023]
Abstract
The rapid strides made in innovative endoscopic technology to improve mucosal visualization have revolutionized endoscopy. Improved lesion detection has allowed the modern endoscopist to provide real-time optical diagnosis. Improvements in image resolution, software processing, and optical filter technology have resulted in the commercial availability of high-definition endoscopy as well as optical contrast techniques such as narrow-band imaging, flexible spectral imaging color enhancement, and i-scan. Along with autofluorescence imaging and confocal laser endomicroscopy, these techniques have complemented and enhanced traditional white light endoscopy. They have the potential to serve as red-flag techniques to improve detection of mucosal abnormalities as well as allow optical diagnosis and virtual histology of detected lesions. This review will focus on these emerging commercially available technologies and aims to provide an overview of the technologies, their clinical applicability, and current status.
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Affiliation(s)
- Venkataraman Subramanian
- Department of Gastroenterology, St James University Hospital and Leeds Institute of Molecular Medicine, University of Leeds, Leeds
| | - Krish Ragunath
- Nottingham Digestive Diseases Centre and NIHR Biomedical Research Unit, Nottingham University Hospital, Nottingham, United Kingdom.
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Comparison of multiple enzyme activatable near-infrared fluorescent molecular probes for detection and quantification of inflammation in murine colitis models. Inflamm Bowel Dis 2014; 20:363-77. [PMID: 24374874 PMCID: PMC4618379 DOI: 10.1097/01.mib.0000440612.98950.79] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Activatable near-infrared fluorescent (NIRF) probes have been used for ex vivo and in vivo detection of intestinal tumors in animal models. We hypothesized that NIRF probes activatable by cathepsins or metalloproteinases will detect and quantify dextran sulphate sodium (DSS)-induced acute colonic inflammation in wild type mice or chronic colitis in interleukin-10 (IL-10)-null mice ex vivo or in vivo. METHODS Wild type mice given DSS, water controls, and IL-10-null mice with chronic colitis were administered probes by retro-orbital injection. FMT2500 LX system imaged fresh and fixed intestine ex vivo and mice in vivo. Inflammation detected by probes was verified by histology and colitis scoring. NIRF signal intensity was quantified using 2-dimensional region of interest ex vivo or 3-dimensional region of interest analysis in vivo. RESULTS Ex vivo, 7 probes tested yielded significant higher NIRF signals in colon of DSS-treated mice versus controls. A subset of probes was tested in IL-10-null mice and yielded strong ex vivo signals. Ex vivo fluorescence signal with 680 series probes was preserved after formalin fixation. In DSS and IL-10-null models, ex vivo NIRF signal strongly and significantly correlated with colitis scores. In vivo, ProSense680, CatK680FAST, and MMPsense680 yielded significantly higher NIRF signals in DSS-treated mice than controls, but background was high in controls. CONCLUSIONS Both cathepsin or metalloproteinase-activated NIRF probes can detect and quantify colonic inflammation ex vivo. ProSense680 yielded the strongest signals in DSS colitis ex vivo and in vivo, but background remains a problem for in vivo quantification of colitis.
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Abstract
Molecular imaging is a novel field in gastroenterology that uses fluorescently labelled probes to specifically highlight neoplastic lesions on the basis of their molecular signature. The development of molecular imaging has been driven by the need to improve endoscopic diagnosis and by progress in targeted therapies in gastrointestinal oncology to provide individualized treatment, which coincides with progress in endoscopy techniques and further miniaturization of detection devices. Different exogenous molecular probes for imaging include labelled antibodies, oligopeptides, affibodies(™) (Affibody AB, Bromma, Sweden), aptamers and activatable probes. Molecular imaging has been evaluated in two major indications: many trials have studied molecular imaging as a red flag technique to improve detection of lesions in wide-field imaging; on the other hand, microscopic analysis has been investigated for in vivo characterization of the molecular fingerprint of tumours with the ultimate goal of assessing the likelihood of response to targeted therapy. This Review focusses on the applications of molecular imaging that have immediate potential for translational science or imminent transition into clinical practice of gastrointestinal endoscopy.
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Urquhart P, DaCosta R, Marcon N. Endoscopic mucosal imaging of gastrointestinal neoplasia in 2013. Curr Gastroenterol Rep 2013; 15:330. [PMID: 23771504 DOI: 10.1007/s11894-013-0330-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The holy grail of gastrointestinal endoscopy consists of the detection, in vivo characterization, and endoscopic removal of early or premalignant mucosal lesions. While our ability to achieve this goal has improved substantially since the development of the modern video-endoscope, inadequate visual inspection, errors of interpretation, and lesion subtlety all contribute to the continued suboptimal detection and assessment of early neoplasia. A myriad of new technologies has thus emerged that may help resolve these shortcomings; high magnification endoscopes, as well as the techniques of dye-based and virtual chromoendoscopy, are now widely available, while confocal laser endomicroscopy and endocystoscopy, optical coherence tomography, and autofluorescence imaging are generally applicable only in a research setting. Such technologies can be broadly categorized according to whether they potentially afford endoscopists improved detection, or real-time characterization, of mucosal lesions. Enhanced detection of otherwise "invisible" lesions, such as a flat area of intramucosal adenocarcinoma within Barrett's esophagus, carries the potential of an endoscopic cure prior to the development into a more advanced or metastatic disease. The ability to characterize a lesion to achieve an in vivo diagnosis, such as a colonic polyp, potentially affords endoscopists the ability to decide which lesions require removal and which can be safely left behind or discarded without histological assessment. Furthermore targeted biopsies, such as in the surveillance of chronic colitis, may prove to be more accurate and efficacious than the current protocol of random biopsies. An important caveat in the discussion of developing technologies in early cancer detection is the fundamental importance of a health-care system that promotes screening programs to recruit at-risk individuals. The ideal tool to optimize the use of endoscopy in population screening would be a panel of reliable biomarkers (blood, stool, or urine) that could effectively select a high-risk group, thus reducing the indiscriminate use of an expensive technology. The following review summarizes the current endoscopic imaging techniques available, and in development, for the early identification of gastrointestinal neoplasia.
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Affiliation(s)
- P Urquhart
- St Michael's Hospital, Toronto, ON, Canada
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34
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Muguruma N, Miyamoto H, Okahisa T, Takayama T. Endoscopic molecular imaging: status and future perspective. Clin Endosc 2013; 46:603-10. [PMID: 24340252 PMCID: PMC3856260 DOI: 10.5946/ce.2013.46.6.603] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2013] [Revised: 09/30/2013] [Accepted: 09/30/2013] [Indexed: 12/13/2022] Open
Abstract
During the last decade, researchers have made great progress in the development of new image processing technologies for gastrointestinal endoscopy. However, diagnosis using conventional endoscopy with white light optical imaging is essentially limited, and ultimately, we still rely on the histopathological diagnosis from biopsy specimens. Molecular imaging represents the most novel imaging methods in medicine, and the future of endoscopic diagnosis is likely to be impacted by a combination of biomarkers and technology. Endoscopic molecular imaging can be defined as the visualization of molecular characteristics with endoscopy. These innovations will allow us not only to locate a tumor or dysplastic lesion but also to visualize its molecular characteristics and the activity of specific molecules and biological processes that affect tumor behavior and/or its response to therapy. In the near future, these promising technologies will play a central role in endoluminal oncology.
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Affiliation(s)
- Naoki Muguruma
- Department of Gastroenterology and Oncology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan
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Kim SY, Myung SJ. Optical molecular imaging for diagnosing intestinal diseases. Clin Endosc 2013; 46:620-6. [PMID: 24340254 PMCID: PMC3856262 DOI: 10.5946/ce.2013.46.6.620] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 10/12/2013] [Accepted: 10/17/2013] [Indexed: 12/20/2022] Open
Abstract
Real-time visualization of the molecular signature of cells can be achieved with advanced targeted imaging techniques using molecular probes and fluorescence endoscopy. This molecular optical imaging in gastrointestinal endoscopy is promising for improving the detection of neoplastic lesions, their characterization for patient stratification, and the assessment of their response to molecular targeted therapy and radiotherapy. In inflammatory bowel disease, this method can be used to detect dysplasia in the presence of background inflammation and to visualize inflammatory molecular targets for assessing disease severity and prognosis. Several preclinical and clinical trials have applied this method in endoscopy; however, this field has just started to evolve. Hence, many problems have yet to be solved to enable the clinical application of this novel method.
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Affiliation(s)
- Sang-Yeob Kim
- Asan Institute for Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Cheng YM, Wu IC, Lai CH, Pu SC, Chou PT, Wei CY, Yu CY, Lin YH, Ting C. Femtosecond Spectroscopy and Dynamics of the Azulenylosquaric Dye, a Near-infrared Nonfluorogenic Quencher. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200600170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Finnberg NK, Liu Y, El-Deiry WS. Detection of DSS-induced gastrointestinal mucositis in mice by non-invasive optical near-infrared (NIR) imaging of cathepsin activity. Cancer Biol Ther 2013; 14:736-41. [PMID: 23792573 DOI: 10.4161/cbt.25094] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Approximately 1.4 million people of the US population suffer from Inflammatory Bowel Disease (IBD) of which the most common conditions are ulcerative colitis (UC) and Crohn disease (CD). Colonoscopy and small bowel follow through are considered the current gold standard in diagnosing IBD. However, improved imaging and increased diagnostic sensitivity could be beneficial. Optical molecular imaging has the potential to become a powerful and practical tool for early detection, image-guided biopsy, and surgery in diagnosing and treating patients with IBD. Here we used a well characterized chemical model to initiate experimental IBD in mice by feeding with dextran sulfate sodium (DSS) containing drinking water in an attempt to investigate the utility of non-invasive infrared (NIR) optical imaging in the detection gastrointestinal (GI) injury. We employed a "smart probe" (ProSense680) cleaved and fluorescently activated in the NIR-spectrum by various forms of secreted cathepsins. This probe has previously been shown to serve as a biomarker for the homing of inflammatory cells to injury. Our investigation suggests that NIR optical imaging can detect cathepsin-dependent probe cleavage non-invasively in animals with DSS-induced IBD. Increased tissue probe-retention and fluorescence was associated with increased infiltration of inflammatory cells, epithelial atrophy and sterilization of the mucosa. Furthermore, using NIR-imaging ex vivo we were able to document regional "hot spots" of inflammatory damage to the large intestine suggesting this method potentially could be coupled with colonoscopy investigation to aid in the sampling and the diagnostics of IBD.
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Agarwal A, Boettcher A, Kneuer R, Sari-Sarraf F, Donovan A, Woelcke J, Simic O, Brandl T, Krucker T. In vivo imaging with fluorescent smart probes to assess treatment strategies for acute pancreatitis. PLoS One 2013; 8:e55959. [PMID: 23409095 PMCID: PMC3569412 DOI: 10.1371/journal.pone.0055959] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 01/07/2013] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND AND AIMS Endoprotease activation is a key step in acute pancreatitis and early inhibition of these enzymes may protect from organ damage. In vivo models commonly used to evaluate protease inhibitors require animal sacrifice and therefore limit the assessment of dynamic processes. Here, we established a non-invasive fluorescence imaging-based biomarker assay to assess real-time protease inhibition and disease progression in a preclinical model of experimental pancreatitis. METHODS Edema development and trypsin activation were imaged in a rat caerulein-injection pancreatitis model. A fluorescent "smart" probe, selectively activated by trypsin, was synthesized by labeling with Cy5.5 of a pegylated poly-L-lysine copolymer. Following injection of the probe, trypsin activation was monitored in the presence or absence of inhibitors by in vivo and ex vivo imaging. RESULTS We established the trypsin-selectivity of the fluorescent probe in vitro using a panel of endopeptidases and specific inhibitor. In vivo, the probe accumulated in the liver and a region attributed to the pancreas by necropsy. A dose dependent decrease of total pancreatic fluorescence signal occurred upon administration of known trypsin inhibitors. The fluorescence-based method was a better predictor of trypsin inhibition than pancreatic to body weight ratio. CONCLUSIONS We established a fluorescence imaging assay to access trypsin inhibition in real-time in vivo. This method is more sensitive and dynamic than classic tissue sample readouts and could be applied to preclinically optimize trypsin inhibitors towards intrapancreatic target inhibition.
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Affiliation(s)
- Abhiruchi Agarwal
- Novartis Institute of BioMedical Research, Cambridge, Massachusetts, United States of America
| | | | - Rainer Kneuer
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Farid Sari-Sarraf
- Novartis Institute of BioMedical Research, Cambridge, Massachusetts, United States of America
| | - Adriana Donovan
- Novartis Institute of BioMedical Research, Cambridge, Massachusetts, United States of America
| | - Julian Woelcke
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Oliver Simic
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Trixi Brandl
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Thomas Krucker
- Novartis Institute of BioMedical Research, Cambridge, Massachusetts, United States of America
- Novartis Institutes of BioMedical Research, Emeryville, California, United States of America
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Bogdanov AA, Mazzanti ML. Fluorescent macromolecular sensors of enzymatic activity for in vivo imaging. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2013; 113:349-87. [PMID: 23244795 DOI: 10.1016/b978-0-12-386932-6.00009-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Macromolecular imaging probes (or sensors) of enzymatic activity have a unique place in the armamentarium of modern optical imaging techniques. Such probes were initially developed by attaching optically "silent" fluorophores via enzyme-sensitive linkers to large copolymers of biocompatible poly(ethylene glycol) and poly(amino acids). In diseased tissue, where the concentration of enzymes is high, the fluorophores are freed from the macromolecular carrier and regain their initial ability to fluoresce, thus allowing in vivo optical localization of the diseased tissue. This chapter describes the design and application of these probes and their alternatives in various areas of experimental medicine and gives an overview of currently available techniques that allow imaging of animals using visible and near-infrared light.
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Affiliation(s)
- Alexei A Bogdanov
- Laboratory of Molecular Imaging Probes, Department of Radiology, University of Massachusetts Medical School, Worcester, Massachusetts, USA
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40
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Bo F, Gao B, Duan W, Li H, Liu H, Bai Q. Assembly–disassembly driven “off–on” fluorescent perylene bisimide probes for detecting and tracking of proteins in living cells. RSC Adv 2013. [DOI: 10.1039/c3ra42284d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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Ding S, Blue RE, Chen Y, Scull B, Lund PK, Morgan D. Molecular Imaging of Gastric Neoplasia with Near-Infrared Fluorescent Activatable Probes. Mol Imaging 2012. [DOI: 10.2310/7290.2012.00014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
- Shengli Ding
- From the Department of Cell and Molecular Physiology and Division of Gastroenterology, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Biological Sciences, Kent State University, Kent, OH; and Department of Gastroenterology, Vanderbilt University Medical Center, Nashville, TN
| | - Randall Eric Blue
- From the Department of Cell and Molecular Physiology and Division of Gastroenterology, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Biological Sciences, Kent State University, Kent, OH; and Department of Gastroenterology, Vanderbilt University Medical Center, Nashville, TN
| | - Yijing Chen
- From the Department of Cell and Molecular Physiology and Division of Gastroenterology, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Biological Sciences, Kent State University, Kent, OH; and Department of Gastroenterology, Vanderbilt University Medical Center, Nashville, TN
| | - Brooks Scull
- From the Department of Cell and Molecular Physiology and Division of Gastroenterology, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Biological Sciences, Kent State University, Kent, OH; and Department of Gastroenterology, Vanderbilt University Medical Center, Nashville, TN
| | - Pauline Kay Lund
- From the Department of Cell and Molecular Physiology and Division of Gastroenterology, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Biological Sciences, Kent State University, Kent, OH; and Department of Gastroenterology, Vanderbilt University Medical Center, Nashville, TN
| | - Douglas Morgan
- From the Department of Cell and Molecular Physiology and Division of Gastroenterology, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Biological Sciences, Kent State University, Kent, OH; and Department of Gastroenterology, Vanderbilt University Medical Center, Nashville, TN
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Hoetker MS, Kiesslich R, Diken M, Moehler M, Galle PR, Li Y, Goetz M. Molecular in vivo imaging of gastric cancer in a human-murine xenograft model: targeting epidermal growth factor receptor. Gastrointest Endosc 2012; 76:612-20. [PMID: 22771099 DOI: 10.1016/j.gie.2012.05.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 05/09/2012] [Indexed: 02/08/2023]
Abstract
BACKGROUND The prognosis of gastric cancer depends on early diagnosis. Targeted therapies against epidermal growth factor receptors (EGFRs) are currently emerging for the treatment of gastric cancer. OBJECTIVE To specifically visualize gastric cancer by using monoclonal antibodies targeting EGFR1 as molecular probes for in vivo molecular confocal laser endomicroscopy (mCLE) in a human-murine xenograft model. DESIGN Prospective in vivo animal study. SETTING Animal laboratory. INTERVENTIONS Human gastric carcinoma xenografts were examined in 26 nude mice by using mCLE after injection of fluorescently labeled antibodies. Nine mice received low-dose anti-EGFR1 antibodies, 7 mice cetuximab, and 7 control mice isotype antibodies. Three mice were screened for autofluorescence without injection. Macroscopic fluorescence was evaluated in 2 additional mice. MAIN OUTCOME MEASUREMENTS Molecular imaging of gastric cancer with confocal laser endomicroscopy. RESULTS Fluorescence intensity in the anti-EGFR1 (P = .0145) and cetuximab group (P = .0047) was significantly higher than in isotype control mice. The same protocol allowed macroscopic fluorescence detection of tumor xenografts. LIMITATIONS Animal model. CONCLUSIONS In vivo microscopic and macroscopic molecular imaging of gastric cancer is feasible in a human-murine xenograft model with both diagnostic and therapeutic antibodies targeting EGFR1. In perspective, mCLE could help diagnose and molecularly characterize gastric cancer during ongoing gastroscopy and may even assist in the prediction of response to therapy.
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Affiliation(s)
- Michael S Hoetker
- 1st Department of Medicine, University Medical Center of Johannes Gutenberg University Mainz, Mainz, Germany
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Bogdanov Jr AA, Mazzanti M, Castillo G, Bolotin E. Protected Graft Copolymer (PGC) in Imaging and Therapy: A Platform for the Delivery of Covalently and Non-Covalently Bound Drugs. Am J Cancer Res 2012; 2:553-76. [PMID: 22737192 PMCID: PMC3381344 DOI: 10.7150/thno.4070] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 02/17/2012] [Indexed: 12/13/2022] Open
Abstract
Initially developed in 1992 as an MR imaging agent, the family of protected graft copolymers (PGC) is based on a conjugate of polylysine backbone to which methoxypoly(ethylene glycol) (MPEG) chains are covalently linked in a random fasion via N-ε-amino groups. While PGC is relatively simple in terms of its chemcial composition and structure, it has proved to be a versatile platform for in vivo drug delivery. The advantages of poly amino acid backbone grafting include multiple available linking sites for drug and adaptor molecules. The grafting of PEG chains to PGC does not compromise biodegradability and does not result in measurable toxicity or immunogenicity. In fact, the biocompatablility of PGC has resulted in its being one of the few 100% synthetic non-proteinaceous macromolecules that has suceeded in passing the initial safety phase of clinical trials. PGC is capable of long circulation times after injection into the blood stream and as such found use early on as a carrier system for delivery of paramagnetic imaging compounds for angiography. Other PGC types were later developed for use in nuclear medicine and optical imaging applications in vivo. Recent developments in PGC-based drug carrier formulations include the use of zinc as a bridge between the PGC carrier and zinc-binding proteins and re-engineering of the PGC carrier as a covalent amphiphile that is capabe of binding to hydrophobic residues of small proteins and peptides. At present, PGC-based formulations have been developed and tested in various disease models for: 1) MR imaging local blood circulation in stroke, cancer and diabetes; 2) MR and nuclear imaging of blood volume and vascular permeability in inflammation; 3) optical imaging of proteolytic activity in cancer and inflammation; 4) delivery of platinum(II) compounds for treating cancer; 5) delivery of small proteins and peptides for treating diabetes, obesity and myocardial infarction. This review summarizes the experience accumulated by various research groups that chose to use PGC as a drug delivery platform.
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Abstract
Recent research has raised hopes for impressively accurate screening for cancer with molecular biomarkers. These molecular markers will probably be more sensitive and specific than older screening modalities, as well as easier to use. In this Essay, I argue that these sensitive screening tests might be clinically valuable - but that they will present unique issues in implementation and interpretation. These issues are likely to affect the way clinicians conduct screening and the way that they make diagnoses in individuals who screen positive for cancer.
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Affiliation(s)
- John A Baron
- Department of Medicine, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599-7555, USA.
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Near-Infrared Fluorescent Nanoprobes for in Vivo Optical Imaging. NANOMATERIALS 2012; 2:92-112. [PMID: 28348298 PMCID: PMC5327900 DOI: 10.3390/nano2020092] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 02/23/2012] [Accepted: 03/26/2012] [Indexed: 11/30/2022]
Abstract
Near-infrared (NIR) fluorescent probes offer advantages of high photon penetration, reduced light scattering and minimal autofluorescence from living tissues, rendering them valuable for noninvasive mapping of molecular events, assessment of therapeutic efficacy, and monitoring of disease progression in animal models. This review provides an overview of the recent development of the design and optical property of the different classes of NIR fluorescent nanoprobes associated with in vivo imaging applications.
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Kwon YS, Cho YS, Yoon TJ, Kim HS, Choi MG. Recent advances in targeted endoscopic imaging: Early detection of gastrointestinal neoplasms. World J Gastrointest Endosc 2012; 4:57-64. [PMID: 22442742 PMCID: PMC3309894 DOI: 10.4253/wjge.v4.i3.57] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Revised: 01/22/2012] [Accepted: 03/02/2012] [Indexed: 02/05/2023] Open
Abstract
Molecular imaging has emerged as a new discipline in gastrointestinal endoscopy. This technology encompasses modalities that can visualize disease-specific morphological or functional tissue changes based on the molecular signature of individual cells. Molecular imaging has several advantages including minimal damage to tissues, repetitive visualization, and utility for conducting quantitative analyses. Advancements in basic science coupled with endoscopy have made early detection of gastrointestinal cancer possible. Molecular imaging during gastrointestinal endoscopy requires the development of safe biomarkers and exogenous probes to detect molecular changes in cells with high specificity anda high signal-to-background ratio. Additionally, a high-resolution endoscope with an accurate wide-field viewing capability must be developed. Targeted endoscopic imaging is expected to improve early diagnosis and individual therapy of gastrointestinal cancer.
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Affiliation(s)
- Yong-Soo Kwon
- Yong-Soo Kwon, Tae-Jong Yoon, Department of Applied Bioscience, CHA University, Seoul 135081, South Korea
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Moin K, Sameni M, Victor BC, Rothberg JM, Mattingly RR, Sloane BF. 3D/4D functional imaging of tumor-associated proteolysis: impact of microenvironment. Methods Enzymol 2012; 506:175-94. [PMID: 22341225 PMCID: PMC3845223 DOI: 10.1016/b978-0-12-391856-7.00034-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Proteases play causal roles in many aspects of the aggressive phenotype of tumors, yet many of the implicated proteases originate from tumor-associated cells or from responses of tumor cells to interactions with other cells. Therefore, to obtain a comprehensive view of tumor proteases, we need to be able to assess proteolysis in tumors that are interacting with their microenvironment. As this is difficult to do in vivo, we have developed functional live-cell optical imaging assays and 3D and 4D (i.e., 3D over time) coculture models. We present here a description of the probes used to measure proteolysis and protease activities, the methods used for imaging and analysis of proteolysis and the 3D and 4D models used in our laboratory. Of course, all assays have limitations; however, we suggest that the techniques discussed here will, with attention to their limitations, be useful as a screen for drugs to target the invasive phenotype of tumors.
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Affiliation(s)
- Kamiar Moin
- Department of Pharmacology, Wayne State University School of Medicine, Detroit, Michigan, USA
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Detection of colorectal adenomas using a bioactivatable probe specific for matrix metalloproteinase activity. Neoplasia 2011; 13:685-91. [PMID: 21847360 DOI: 10.1593/neo.11400] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Revised: 06/07/2011] [Accepted: 06/09/2011] [Indexed: 01/12/2023] Open
Abstract
A significant proportion of colorectal adenomas, in particular those that lack an elevated growth component, continue to escape detection during endoscopic surveillance. Elevation of the activity of matrix metalloproteinases (MMPs), a large family of zinc endopeptidases, in adenomas serves as a biomarker of early tumorigenesis. The goal of this study was to assess the feasibility of using a newly developed near-infrared bioactivatable probe (MMPSense 680) that reports the activity of a broad array of MMP isoforms to detect early colorectal adenomas. Adenomatous polyposis coli (Apc)(+/Min-FCCC) mice that spontaneously develop multiple colorectal adenomas were injected with MMPSense 680, and the colons were imaged in an IVIS Spectrum system ex vivo. Image analyses were correlated with histopathologic findings for all regions of interest (ROIs). The biochemical basis of fluorescent signal was investigated by immunohistochemical staining of MMP-7 and -9. A strong correlation (Kendall = 0.80) was observed between a positive signal and the presence of pathologically confirmed colonic adenomas; 92.9% of the 350 ROIs evaluated were classified correctly. The correlation between two independent observers was 0.87. MMP-7 expression was localized to epithelial cells of adenomas and microadenomas, whereas staining of MMP-9 was found in infiltrating polymorphonuclear leukocytes within the adenomas. MMPSense 680 identifies colorectal adenomas, both polypoid and nonpolypoid, in Apc(+/Min-FCCC) mice with high specificity. Use of this fluorescent probe in combination with colonoscopy could aid in preventing colorectal neoplasias by providing new opportunities for early detection and therapeutic intervention.
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Yoon SM, Myung SJ, Kim IW, Do EJ, Ye BD, Ryu JH, Park K, Kim K, Kwon IC, Kim MJ, Moon DH, Yang DH, Kim KJ, Byeon JS, Yang SK, Kim JH. Application of near-infrared fluorescence imaging using a polymeric nanoparticle-based probe for the diagnosis and therapeutic monitoring of colon cancer. Dig Dis Sci 2011; 56:3005-13. [PMID: 21465144 DOI: 10.1007/s10620-011-1685-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2010] [Accepted: 03/15/2011] [Indexed: 12/11/2022]
Abstract
BACKGROUND Early and accurate detection of adenomatous colonic polyps is a major concern in the prevention of colon cancer. Near-infrared fluorescence (NIRF) imaging with optical probes targeting specific peptides enables the noninvasive visualization and characterization of lesions. Matrix metalloproteinases (MMPs) are known to play an important role in tumorigenesis and tumor progression. AIM To investigate the effectiveness of NIRF imaging, with a novel MMP-activatable probe based on a polymeric nanoparticle platform, in the colon cancer models. METHODS We used an azoxymethane (AOM)-induced mouse colon cancer model resembling human sporadic colon cancer and an MMP-positive xenograft tumor model. MMP expression was evaluated by Western blotting, real-time PCR, and immunohistochemical staining. NIRF imaging was performed with a novel MMP-activatable probe, an MMP-inactivatable probe, and saline. In addition, we observed the change of NIRF signal intensity after intratumoral administration of an MMP-inhibitor. RESULTS Multiple tumors with various sizes developed in AOM-treated mouse colons, progressing from adenomas to adenocarcinomas, with MMP expression progressively increasing in the normal-adenoma-adenocarcinoma sequence. In mice injected with the MMP-activatable probe, the NIRF signal also increased in this sequence and was highly correlated with MMP expression (p < 0.001). Tumor-background-ratios (TBR) of adenocarcinoma to adjacent normal mucosa by a novel probe were significantly higher than that of adenoma (p < 0.001). In both the AOM and xenograft models, NIRF signals of tumors decreased after treatment with an MMP-inhibitor. CONCLUSIONS NIRF imaging using a polymeric nanoparticle-based probe may be useful for detecting early stage disease and for assessing treatment response.
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Affiliation(s)
- Soon Man Yoon
- Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea
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Abstract
The early detection of many human diseases is crucial if they are to be treated successfully. Therefore, the development of imaging techniques that can facilitate early detection of disease is of high importance. Changes in the levels of enzyme expression are known to occur in many diseases, making their accurate detection at low concentrations an area of considerable active research. Activatable fluorescent probes show immense promise in this area. If properly designed they should exhibit no signal until they interact with their target enzyme, reducing the level of background fluorescence and potentially endowing them with greater sensitivity. The mechanisms of fluorescence changes in activatable probes vary. This review aims to survey the field of activatable probes, focusing on their mechanisms of action as well as illustrating some of the in vitro and in vivo settings in which they have been employed.
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Affiliation(s)
- Christopher R Drake
- Department of Radiology and Biomedical Imaging, University of California San Francisco, 185 Berry Street, Suite 350, Box 0946, San Francisco, CA, 94107, USA
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