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Lucinian YA, Martineau P, Abikhzer G, Harel F, Pelletier-Galarneau M. Novel tracers to assess myocardial inflammation with radionuclide imaging. J Nucl Cardiol 2024:102012. [PMID: 39069249 DOI: 10.1016/j.nuclcard.2024.102012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 07/08/2024] [Accepted: 07/15/2024] [Indexed: 07/30/2024]
Abstract
Myocardial inflammation plays a central role in the pathophysiology of various cardiac diseases. While FDG-PET is currently the primary method for molecular imaging of myocardial inflammation, its effectiveness is hindered by physiological myocardial uptake as well as its propensity for uptake by multiple disease-specific mechanisms. Novel radiotracers targeting diverse inflammatory immune cells and molecular pathways may provide unique insight through the visualization of underlying mechanisms central to the pathogenesis of inflammatory cardiac diseases, offering opportunities for increased understanding of immunocardiology. Moreover, the potentially enhanced specificity may lead to better quantification of disease activity, aiding in the guidance and monitoring of immunomodulatory therapy. This review aims to provide an update on advancements in non-FDG radiotracers for imaging myocardial inflammatory diseases, with a focus on cardiac sarcoidosis, myocarditis, and acute myocardial infarction.
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Affiliation(s)
| | | | - Gad Abikhzer
- Jewish General Hospital, Montreal, Quebec, Canada
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Andriana P, Fair-Mäkelä R, Liljenbäck H, Kärnä S, Iqbal I, Makrypidi K, Rajander J, Pirmettis I, Li XG, Jalkanen S, Saraste A, Salmi M, Roivainen A. Macrophage mannose receptor CD206 targeting of fluoride-18 labeled mannosylated dextran: A validation study in mice. Eur J Nucl Med Mol Imaging 2024; 51:2216-2228. [PMID: 38532026 PMCID: PMC11178572 DOI: 10.1007/s00259-024-06686-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 03/10/2024] [Indexed: 03/28/2024]
Abstract
PURPOSE Aluminum fluoride-18-labeled 1,4,7-triazacyclononane-1,4,7-triacetic acid-conjugated mannosylated dextran derivative (Al[18F]F-NOTA-D10CM) is a new tracer for PET imaging. We report here on in vitro and in vivo validation of the tracer's ability to target the macrophage mannose receptor CD206. METHODS First, the uptake of intravenously (i.v.) administered Al[18F]F-NOTA-D10CM was compared between wild-type (WT) and CD206-/- knockout (KO) mice. C57BL/6N mice were injected with complete Freund's adjuvant (CFA) in the left hind leg and the uptake of Al[18F]F-NOTA-D10CM after i.v. or intradermal (i.d.) injection was studied at 5 and 14 days after CFA induction of inflammation. Healthy C57BL/6N mice were studied as controls. Mice underwent PET/CT on consecutive days with [18F]FDG, i.v. Al[18F]F-NOTA-D10CM, and i.d. Al[18F]F-NOTA-D10CM. After the last imaging, Al[18F]F-NOTA-D10CM was i.v. injected for an ex vivo biodistribution study and autoradiography of inflamed tissues. Blood plasma samples were analyzed using high-performance liquid chromatography. To evaluate the specificity of Al[18F]F-NOTA-D10CM binding, an in vitro competitive displacement study was performed on inflamed tissue sections using autoradiography. CD206 expression was assessed by immunohistochemical staining. RESULTS Compared with WT mice, the uptake of Al[18F]F-NOTA-D10CM was significantly lower in several CD206-/- KO mice tissues, including liver (SUV 8.21 ± 2.51 vs. 1.06 ± 0.16, P < 0.001) and bone marrow (SUV 1.63 ± 0.37 vs. 0.22 ± 0.05, P < 0.0001). The uptake of i.v. injected Al[18F]F-NOTA-D10CM was significantly higher in inflamed ankle joint (SUV 0.48 ± 0.13 vs. 0.18 ± 0.05, P < 0.0001) and inflamed foot pad skin (SUV 0.41 ± 0.10 vs. 0.04 ± 0.01, P < 0.0001) than in the corresponding tissues in healthy mice. The i.d.-injected Al[18F]F-NOTA-D10CM revealed differences between CFA-induced lymph node activation and lymph nodes in healthy mice. Ex vivo γ-counting, autoradiography, and immunohistochemistry supported the results, and a decrease of ~ 80% in the binding of Al[18F]F-NOTA-D10CM in the displacement study with excess NOTA-D10CM confirmed that tracer binding was specific. At 60 min after i.v. injection, an average 96.70% of plasma radioactivity was derived from intact Al[18F]F-NOTA-D10CM, indicating good in vivo stability. The uptake of Al[18F]F-NOTA-D10CM into inflamed tissues was positively associated with the area percentage of CD206-positive staining. CONCLUSION The uptake of mannosylated dextran derivative Al[18F]F-NOTA-D10CM correlated with CD206 expression and the tracer appears promising for inflammation imaging.
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Affiliation(s)
- Putri Andriana
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland
| | - Ruth Fair-Mäkelä
- Institute of Biomedicine, University of Turku, Turku, Finland
- InFLAMES Research Flagship Center, University of Turku, Turku, Finland
| | - Heidi Liljenbäck
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland
- Turku Center of Disease Modeling, University of Turku, Turku, Finland
| | - Salli Kärnä
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland
| | - Imran Iqbal
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland
| | - Konstantina Makrypidi
- Institute of Nuclear and Radiological Science and Technology, Energy and Safety, NCSR "Demokritos", Athens, Greece
| | - Johan Rajander
- Turku PET Centre, Accelerator Laboratory, Åbo Akademi University, Turku, Finland
| | - Ioannis Pirmettis
- Institute of Nuclear and Radiological Science and Technology, Energy and Safety, NCSR "Demokritos", Athens, Greece
| | - Xiang-Guo Li
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland
- InFLAMES Research Flagship Center, University of Turku, Turku, Finland
- Department of Chemistry, University of Turku, Turku, Finland
| | - Sirpa Jalkanen
- InFLAMES Research Flagship Center, University of Turku, Turku, Finland
- MediCity Research Laboratory, University of Turku, Turku, Finland
| | - Antti Saraste
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland
- Turku PET Centre, Turku University Hospital, Turku, Finland
- Heart Center, Turku University Hospital and University of Turku, Turku, Finland
| | - Marko Salmi
- Institute of Biomedicine, University of Turku, Turku, Finland
- InFLAMES Research Flagship Center, University of Turku, Turku, Finland
- MediCity Research Laboratory, University of Turku, Turku, Finland
| | - Anne Roivainen
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland.
- InFLAMES Research Flagship Center, University of Turku, Turku, Finland.
- Turku Center of Disease Modeling, University of Turku, Turku, Finland.
- Turku PET Centre, Turku University Hospital, Turku, Finland.
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Jeong S, Jeon OH, Hong JH, Kim K, Kim BM, Park JY, Kim K, Cho HW, Kim HK. Detection of metastatic lymph node and sentinel lymph node mapping using mannose receptor targeting in in vivo mouse footpad tumor models and rabbit uterine cancer models. Int J Surg 2024; 110:2692-2700. [PMID: 38377062 PMCID: PMC11093454 DOI: 10.1097/js9.0000000000001227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 02/13/2024] [Indexed: 02/22/2024]
Abstract
BACKGROUND This study aimed to evaluate the effectiveness of neo-mannosyl human serum albumin-indocyanine green (MSA-ICG) for detecting metastatic lymph node (LN) and mapping sentinel lymph node (SLN) using mouse footpad uterine tumor models. Additionally, the authors assessed the feasibility of MSA-ICG in SLN mapping in rabbit uterine cancer models. MATERIALS AND METHODS The authors compared the LN targeting ability of MSA-ICG with ICG. Six mouse footpad tumor models and two normal mice were each assigned to MSA-ICG and ICG, respectively. After the assigned tracers were injected, fluorescence images were taken, and the authors compared the signal-to-background ratio (SBR) of the tracers. A SLN biopsy was performed to confirm LN metastasis status and CD206 expression level. Finally, an intraoperative SLN biopsy was performed in rabbit uterine cancer models using MSA-ICG. RESULTS The authors detected 14 groin LNs out of 16 in the MSA-ICG and ICG groups. The SBR of the MSA-ICG group was significantly higher than that of the ICG group. The metastatic LN subgroup of MSA-ICG showed a significantly higher SBR than that of ICG. CD206 was expressed at a high level in metastatic LN, and the signal intensity difference increased as the CD206 expression level increased. SLN mapping was successfully performed in two of the three rabbit uterine cancer models. CONCLUSIONS MSA-ICG was able to distinguish metastatic LN for an extended period due to its specific tumor-associated macrophage-targeting property. Therefore, it may be a more distinguishable tracer for identifying metastatic LNs and SLNs during uterine cancer surgery. Further research is needed to confirm these results.
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Affiliation(s)
- Sohyeon Jeong
- Department of Obstetrics and Gynecology, Korea University Guro Hospital
| | - Ok Hwa Jeon
- Department of Thoracic and Cardiovascular Surgery, Korea University Guro Hospital, Korea University College of Medicine
- Department of Biomedical Sciences, Korea University College of Medicine
| | - Jin Hwa Hong
- Department of Obstetrics and Gynecology, Korea University Guro Hospital
| | - Kyungsu Kim
- Department of Thoracic and Cardiovascular Surgery, Korea University Guro Hospital, Korea University College of Medicine
- Department of Biomedical Sciences, Korea University College of Medicine
| | | | - Ji Yong Park
- Department of Nuclear Medicine, College of Medicine, Seoul National University
| | - Kweon Kim
- Cellbion Co., Ltd., Seoul, Republic of Korea
| | - Hyun-Woong Cho
- Department of Obstetrics and Gynecology, Korea University Guro Hospital
| | - Hyun Koo Kim
- Department of Thoracic and Cardiovascular Surgery, Korea University Guro Hospital, Korea University College of Medicine
- Department of Biomedical Sciences, Korea University College of Medicine
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Andriana P, Makrypidi K, Liljenbäck H, Rajander J, Saraste A, Pirmettis I, Roivainen A, Li XG. Aluminum Fluoride-18 Labeled Mannosylated Dextran: Radiosynthesis and Initial Preclinical Positron Emission Tomography Studies. Mol Imaging Biol 2023; 25:1094-1103. [PMID: 37016195 PMCID: PMC10728250 DOI: 10.1007/s11307-023-01816-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Revised: 03/17/2023] [Accepted: 03/20/2023] [Indexed: 04/06/2023]
Abstract
PURPOSE In addition to being expressed on liver sinusoidal endothelial cells, mannose receptors are also found on antigen-presenting cells, including macrophages, which are mainly involved in the inflammation process. Dextran derivatives of various sizes containing cysteine and mannose moieties have previously been labeled with 99mTc and used for single-photon emission computed tomography imaging of sentinel lymph nodes. In this study, we radiolabeled 21.3-kDa D10CM with positron-emitting 18F for initial positron emission tomography (PET) studies in rats. PROCEDURES D10CM was conjugated with 1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA) chelator and radiolabeled with the aluminum fluoride-18 method. The whole-body distribution kinetics and stability of the intravenously administered tracer were studied in healthy male Sprague-Dawley rats by in vivo PET/CT imaging, ex vivo gamma counting, and high-performance liquid chromatography analysis. RESULTS Al[18F]F-NOTA-D10CM was obtained with a radiochemical purity of >99% and molar activity of 9.9 GBq/μmol. At 60 minutes after injection, an average of 84% of the intact tracer was found in the blood, indicating excellent in vivo stability. The highest radioactivity concentration was seen in the liver, spleen, and bone marrow, in which mannose receptors are highly expressed under physiological conditions. The uptake specificity was confirmed with in vivo blocking experiments. CONCLUSIONS Our results imply that Al[18F]F-NOTA-D10CM is a suitable tracer for PET imaging. Further studies in disease models with mannose receptor CD206-positive macrophages are warranted to clarify the tracer's potential for imaging of inflammation.
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Affiliation(s)
- Putri Andriana
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520, Turku, Finland
| | - Konstantina Makrypidi
- Institute of Nuclear and Radiological Science and Technology, Energy and Safety, NCSR "Demokritos", 15310, Athens, Greece
| | - Heidi Liljenbäck
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520, Turku, Finland
- Turku Center for Disease Modeling, University of Turku, FI-20520, Turku, Finland
| | - Johan Rajander
- Accelerator Laboratory, Åbo Akademi University, FI-20520, Turku, Finland
| | - Antti Saraste
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520, Turku, Finland
- Turku PET Centre, Turku University Hospital, FI-20520, Turku, Finland
- Heart Center, Turku University Hospital and University of Turku, FI-20520, Turku, Finland
| | - Ioannis Pirmettis
- Institute of Nuclear and Radiological Science and Technology, Energy and Safety, NCSR "Demokritos", 15310, Athens, Greece
| | - Anne Roivainen
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520, Turku, Finland.
- Turku Center for Disease Modeling, University of Turku, FI-20520, Turku, Finland.
- Turku PET Centre, Turku University Hospital, FI-20520, Turku, Finland.
- InFLAMES Research Flagship Center, University of Turku, FI-20520, Turku, Finland.
| | - Xiang-Guo Li
- Turku PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520, Turku, Finland.
- InFLAMES Research Flagship Center, University of Turku, FI-20520, Turku, Finland.
- Department of Chemistry, University of Turku, FI-20014, Turku, Finland.
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Gu GJ, Chung H, Park JY, Yoo R, Im HJ, Choi H, Lee YS, Seok SH. Mannosylated-serum albumin nanoparticle imaging to monitor tumor-associated macrophages under anti-PD1 treatment. J Nanobiotechnology 2023; 21:31. [PMID: 36707872 PMCID: PMC9881286 DOI: 10.1186/s12951-023-01791-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 01/21/2023] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Immune checkpoint inhibitors such as anti-programmed cell death protein 1 (PD1) block tumor growth by reinvigorating the immune system; however, determining their efficacy only by the changes in tumor size may prove inaccurate. As the immune cells including macrophages in the tumor microenvironment (TME) are associated with the response to anti-PD1 therapy, tumor-associated macrophages (TAMs) imaging using nanoparticles can noninvasively provide the immune enrichment status of TME. Herein, the mannosylated-serum albumin (MSA) nanoparticle was labeled with radioactive isotope 68Ga to target the mannose receptors on macrophages for noninvasive monitoring of the TME according to anti-PD1 therapy. RESULTS B16F10-Luc and MC38-Luc tumor-bearing mice were treated with anti-PD1, and the response to anti-PD1 was determined by the tumor volume. According to the flow cytometry, the responders to anti-PD1 showed an increased proportion of TAMs, as well as lymphocytes, and the most enriched immune cell population in the TME was also TAMs. For noninvasive imaging of TAMs as a surrogate of immune cell augmentation in the TME via anti-PD1, we acquired [68Ga] Ga-MSA positron emission tomography. According to the imaging study, an increased number of TAMs in responders at the early phase of anti-PD1 treatment was observed in both B16F10-Luc and MC38-Luc tumor-bearing mice models. CONCLUSION As representative immune cells in the TME, non-invasive imaging of TAMs using MSA nanoparticles can reflect the immune cell enrichment status in the TME closely associated with the response to anti-PD1. As non-invasive imaging using MSA nanoparticles, this approach shows a potential to monitor and evaluate anti-tumor response to immune checkpoint inhibitors.
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Affiliation(s)
- Gyo Jeong Gu
- grid.31501.360000 0004 0470 5905Macrophage Laboratory, Department of Microbiology and Immunology, Institute of Endemic Disease, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Hyewon Chung
- grid.31501.360000 0004 0470 5905Macrophage Laboratory, Department of Microbiology and Immunology, Institute of Endemic Disease, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.31501.360000 0004 0470 5905Bio-MAX Institute, Seoul National University, Seoul, Republic of Korea
| | - Ji Yong Park
- grid.31501.360000 0004 0470 5905Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.31501.360000 0004 0470 5905Dental Research Institute, Seoul National University, Seoul, Republic of Korea
| | - Ranji Yoo
- grid.31501.360000 0004 0470 5905Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.412484.f0000 0001 0302 820X Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Hyung-Jun Im
- grid.31501.360000 0004 0470 5905Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Republic of Korea ,grid.31501.360000 0004 0470 5905Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Hongyoon Choi
- grid.31501.360000 0004 0470 5905Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.31501.360000 0004 0470 5905Radiation Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.412484.f0000 0001 0302 820XDepartment of Nuclear Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Yun-Sang Lee
- grid.31501.360000 0004 0470 5905Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.31501.360000 0004 0470 5905Radiation Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.31501.360000 0004 0470 5905Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.31501.360000 0004 0470 5905Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seung Hyeok Seok
- grid.31501.360000 0004 0470 5905Macrophage Laboratory, Department of Microbiology and Immunology, Institute of Endemic Disease, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.31501.360000 0004 0470 5905Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea ,grid.31501.360000 0004 0470 5905Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea
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van der Geest KSM, Sandovici M, Nienhuis PH, Slart RHJA, Heeringa P, Brouwer E, Jiemy WF. Novel PET Imaging of Inflammatory Targets and Cells for the Diagnosis and Monitoring of Giant Cell Arteritis and Polymyalgia Rheumatica. Front Med (Lausanne) 2022; 9:902155. [PMID: 35733858 PMCID: PMC9207253 DOI: 10.3389/fmed.2022.902155] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 05/13/2022] [Indexed: 12/26/2022] Open
Abstract
Giant cell arteritis (GCA) and polymyalgia rheumatica (PMR) are two interrelated inflammatory diseases affecting patients above 50 years of age. Patients with GCA suffer from granulomatous inflammation of medium- to large-sized arteries. This inflammation can lead to severe ischemic complications (e.g., irreversible vision loss and stroke) and aneurysm-related complications (such as aortic dissection). On the other hand, patients suffering from PMR present with proximal stiffness and pain due to inflammation of the shoulder and pelvic girdles. PMR is observed in 40-60% of patients with GCA, while up to 21% of patients suffering from PMR are also affected by GCA. Due to the risk of ischemic complications, GCA has to be promptly treated upon clinical suspicion. The treatment of both GCA and PMR still heavily relies on glucocorticoids (GCs), although novel targeted therapies are emerging. Imaging has a central position in the diagnosis of GCA and PMR. While [18F]fluorodeoxyglucose (FDG)-positron emission tomography (PET) has proven to be a valuable tool for diagnosis of GCA and PMR, it possesses major drawbacks such as unspecific uptake in cells with high glucose metabolism, high background activity in several non-target organs and a decrease of diagnostic accuracy already after a short course of GC treatment. In recent years, our understanding of the immunopathogenesis of GCA and, to some extent, PMR has advanced. In this review, we summarize the current knowledge on the cellular heterogeneity in the immunopathology of GCA/PMR and discuss how recent advances in specific tissue infiltrating leukocyte and stromal cell profiles may be exploited as a source of novel targets for imaging. Finally, we discuss prospective novel PET radiotracers that may be useful for the diagnosis and treatment monitoring in GCA and PMR.
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Affiliation(s)
- Kornelis S. M. van der Geest
- Department of Rheumatology and Clinical Immunology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - Maria Sandovici
- Department of Rheumatology and Clinical Immunology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - Pieter H. Nienhuis
- Department of Nuclear Medicine and Molecular Imaging, Medical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Riemer H. J. A. Slart
- Department of Nuclear Medicine and Molecular Imaging, Medical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
- Department of Biomedical Photonic Imaging Group, University of Twente, Enschede, Netherlands
| | - Peter Heeringa
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - Elisabeth Brouwer
- Department of Rheumatology and Clinical Immunology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - William F. Jiemy
- Department of Rheumatology and Clinical Immunology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
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KSNM60: The History of Radiopharmaceutical Sciences in Korea. Nucl Med Mol Imaging 2022; 56:114-126. [DOI: 10.1007/s13139-022-00744-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 02/17/2022] [Accepted: 03/10/2022] [Indexed: 10/18/2022] Open
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Phua VJX, Yang CT, Xia B, Yan SX, Liu J, Aw SE, He T, Ng DCE. Nanomaterial Probes for Nuclear Imaging. NANOMATERIALS 2022; 12:nano12040582. [PMID: 35214911 PMCID: PMC8875160 DOI: 10.3390/nano12040582] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/28/2022] [Accepted: 02/02/2022] [Indexed: 02/04/2023]
Abstract
Nuclear imaging is a powerful non-invasive imaging technique that is rapidly developing in medical theranostics. Nuclear imaging requires radiolabeling isotopes for non-invasive imaging through the radioactive decay emission of the radionuclide. Nuclear imaging probes, commonly known as radiotracers, are radioisotope-labeled small molecules. Nanomaterials have shown potential as nuclear imaging probes for theranostic applications. By modifying the surface of nanomaterials, multifunctional radio-labeled nanomaterials can be obtained for in vivo biodistribution and targeting in initial animal imaging studies. Various surface modification strategies have been developed, and targeting moieties have been attached to the nanomaterials to render biocompatibility and enable specific targeting. Through integration of complementary imaging probes to a single nanoparticulate, multimodal molecular imaging can be performed as images with high sensitivity, resolution, and specificity. In this review, nanomaterial nuclear imaging probes including inorganic nanomaterials such as quantum dots (QDs), organic nanomaterials such as liposomes, and exosomes are summarized. These new developments in nanomaterials are expected to introduce a paradigm shift in nuclear imaging, thereby creating new opportunities for theranostic medical imaging tools.
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Affiliation(s)
- Vanessa Jing Xin Phua
- Department of Nuclear Medicine and Molecular Imaging, Radiological Sciences Division, Singapore General Hospital, Outram Road, Singapore 169608, Singapore; (V.J.X.P.); (S.X.Y.); (S.E.A.); (D.C.E.N.)
| | - Chang-Tong Yang
- Department of Nuclear Medicine and Molecular Imaging, Radiological Sciences Division, Singapore General Hospital, Outram Road, Singapore 169608, Singapore; (V.J.X.P.); (S.X.Y.); (S.E.A.); (D.C.E.N.)
- Duke-NUS Medical School, 8 College Road, Singapore 169857, Singapore
- Correspondence: ; Tel.: +65-6326-5666
| | - Bin Xia
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China; (B.X.); (T.H.)
| | - Sean Xuexian Yan
- Department of Nuclear Medicine and Molecular Imaging, Radiological Sciences Division, Singapore General Hospital, Outram Road, Singapore 169608, Singapore; (V.J.X.P.); (S.X.Y.); (S.E.A.); (D.C.E.N.)
- Duke-NUS Medical School, 8 College Road, Singapore 169857, Singapore
| | - Jiang Liu
- Department of Computer Science and Engineering, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen 518055, China;
| | - Swee Eng Aw
- Department of Nuclear Medicine and Molecular Imaging, Radiological Sciences Division, Singapore General Hospital, Outram Road, Singapore 169608, Singapore; (V.J.X.P.); (S.X.Y.); (S.E.A.); (D.C.E.N.)
- Duke-NUS Medical School, 8 College Road, Singapore 169857, Singapore
| | - Tao He
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China; (B.X.); (T.H.)
| | - David Chee Eng Ng
- Department of Nuclear Medicine and Molecular Imaging, Radiological Sciences Division, Singapore General Hospital, Outram Road, Singapore 169608, Singapore; (V.J.X.P.); (S.X.Y.); (S.E.A.); (D.C.E.N.)
- Duke-NUS Medical School, 8 College Road, Singapore 169857, Singapore
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Vong K, Yamamoto T, Tanaka K. Artificial Glycoproteins as a Scaffold for Targeted Drug Therapy. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1906890. [PMID: 32068952 DOI: 10.1002/smll.201906890] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 12/24/2019] [Indexed: 06/10/2023]
Abstract
Akin to a cellular "fingerprint," the glycocalyx is a glycan-enriched cellular coating that plays a crucial role in mediating cell-to-cell interactions. To gain a better understanding of the factors that govern in vivo recognition, artificial glycoproteins were initially created to probe changes made to the accumulation and biodistribution of specific glycan assemblies through biomimicry. As a result, the organ-specific accumulation for a variety of glycoproteins decorated with simple and/or complex glycans was identified. Additionally, binding trends with regard to cancer cell selectivity were also investigated. To exploit the knowledge gained from these studies, numerous groups thus became engaged in developing targeted drug methodologies based on the use of artificial glycoproteins. This has either been done through adopting the glycoprotein scaffold as a drug carrier, or to directly glycosylate therapeutic proteins/enzymes to localize their biological activity. The principle aim of this Review is to present the foundational research that has driven artificial glycoprotein-based targeting and subsequent adaptations with potential therapeutic applications.
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Affiliation(s)
- Kenward Vong
- Biofunctional Synthetic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
| | - Tomoya Yamamoto
- Biofunctional Synthetic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
| | - Katsunori Tanaka
- Biofunctional Synthetic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan
- Biofunctional Chemistry Laboratory, A. Butlerov Institute of Chemistry, Kazan Federal University, 18 Kremlyovskaya Street, Kazan, 420008, Russian Federation
- GlycoTargeting Research Laboratory, RIKEN Baton Zone Program, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
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10
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Farber G, Boczar KE, Wiefels CC, Zelt JG, Guler EC, deKemp RA, Beanlands RS, Rotstein BH. The Future of Cardiac Molecular Imaging. Semin Nucl Med 2020; 50:367-385. [DOI: 10.1053/j.semnuclmed.2020.02.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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11
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Park JB, Suh M, Park JY, Park JK, Kim YI, Kim H, Cho YS, Kang H, Kim K, Choi JH, Nam JW, Kim HK, Lee YS, Jeong JM, Kim YJ, Paeng JC, Lee SP. Assessment of Inflammation in Pulmonary Artery Hypertension by 68Ga-Mannosylated Human Serum Albumin. Am J Respir Crit Care Med 2020; 201:95-106. [PMID: 31322420 DOI: 10.1164/rccm.201903-0639oc] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Rationale: Diagnosis and monitoring of patients with pulmonary artery hypertension (PAH) is currently difficult.Objectives: We aimed to develop a noninvasive imaging modality for PAH that tracks the infiltration of macrophages into the pulmonary vasculature, using a positron emission tomography (PET) agent, 68Ga-2-(p-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA) mannosylated human serum albumin (MSA), that targets the mannose receptor (MR).Methods: We induced PAH in rats by monocrotaline injection. Tissue analysis, echocardiography, and 68Ga-NOTA-MSA PET were performed weekly in rats after monocrotaline injection and in those treated with either sildenafil or macitentan. The translational potential of 68Ga-NOTA-MSA PET was explored in patients with PAH.Measurements and Main Results: Gene sets related to macrophages were significantly enriched on whole transcriptome sequencing of the lung tissue in PAH rats. Serial PET images of PAH rats demonstrated increasing uptake of 68Ga-NOTA-MSA in the lung by time that corresponded with the MR-positive macrophage recruitment observed in immunohistochemistry. In sildenafil- or macitentan-treated PAH rats, the infiltration of MR-positive macrophages by histology and the uptake of 68Ga-NOTA-MSA on PET was significantly lower than that of the PAH-only group. The pulmonary uptake of 68Ga-NOTA-MSA was significantly higher in patients with PAH than normal subjects (P = 0.009) or than those with pulmonary hypertension by left heart disease (P = 0.019) (n = 5 per group).Conclusions: 68Ga-NOTA-MSA PET can help diagnose PAH and monitor the inflammatory status by imaging the degree of macrophage infiltration into the lung. These observations suggest that 68Ga-NOTA-MSA PET has the potential to be used as a novel noninvasive diagnostic and monitoring tool of PAH.
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Affiliation(s)
- Jun-Bean Park
- Cardiovascular Center, Seoul National University Hospital, Seoul, Republic of Korea.,Division of Cardiology, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | | | | | - Jin Kyun Park
- Division of Rheumatology, Department of Internal Medicine, Seoul National University Hospital and Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yong-Il Kim
- Department of Nuclear Medicine, University of Ulsan College of Medicine and Asan Medical Center, Seoul, Republic of Korea; and
| | - Hyunah Kim
- Cardiovascular Center, Seoul National University Hospital, Seoul, Republic of Korea
| | - Ye Seul Cho
- Cardiovascular Center, Seoul National University Hospital, Seoul, Republic of Korea
| | - Hyejeong Kang
- Cardiovascular Center, Seoul National University Hospital, Seoul, Republic of Korea
| | - Kibyung Kim
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Republic of Korea
| | - Jae-Hoon Choi
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Republic of Korea
| | - Jin-Wu Nam
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, Republic of Korea
| | - Hyung-Kwan Kim
- Cardiovascular Center, Seoul National University Hospital, Seoul, Republic of Korea.,Division of Cardiology, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | | | | | - Yong-Jin Kim
- Cardiovascular Center, Seoul National University Hospital, Seoul, Republic of Korea.,Division of Cardiology, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | | | - Seung-Pyo Lee
- Cardiovascular Center, Seoul National University Hospital, Seoul, Republic of Korea.,Division of Cardiology, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
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12
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Lee JY, Kim HY, Lee YS, Jeong JM. Naphthol Blue Black and 99mTc-Labeled Mannosylated Human Serum Albumin ( 99mTc-MSA) Conjugate as a Multimodal Lymph Node Mapping Nanocarrier. Sci Rep 2018; 8:13636. [PMID: 30206287 PMCID: PMC6134003 DOI: 10.1038/s41598-018-31933-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 08/24/2018] [Indexed: 02/01/2023] Open
Abstract
99mTc-labeled mannosylated human serum albumin (MSA) has been reported as a sentinel lymph node (SLN)-imaging agent by binding to macrophages in the LNs. By conjugating it with blue dye, we developed a new multimodal radio-nanocarrier by visual investigation, fluorescence imaging, and single photon emission computed tomography (SPECT)/computed tomography (CT). Binding affinities of seven blue dyes to MSA were tested. According to the spectroscopic study and visual inspection of MSA-bound dyes, naphthol blue black (NBB) was selected as the best candidate of multimodal agent. Thus, 99mTc-MSA-NBB conjugate was prepared and further investigated using mice. After footpad injection, it showed high popliteal LN accumulation at 1 h. SPECT/CT also showed high popliteal as well as inguinal LN uptakes at 10 min that sustained until 2 h. In conclusion, we prepared a multimodal SLN imaging radio-nanocarrier, 99mTc-MSA-NBB conjugate, and confirmed its excellency as a multimodal probe for SLN mapping.
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Affiliation(s)
- Ji Youn Lee
- Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Biomedical Sciences, Seoul National University Graduate School, Seoul, Republic of Korea
| | - Ho Young Kim
- Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yun-Sang Lee
- Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jae Min Jeong
- Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea. .,Department of Biomedical Sciences, Seoul National University Graduate School, Seoul, Republic of Korea. .,Cancer Research Institute, Seoul National University, Seoul, Republic of Korea.
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13
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Harvey DJ. Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: An update for 2011-2012. MASS SPECTROMETRY REVIEWS 2017; 36:255-422. [PMID: 26270629 DOI: 10.1002/mas.21471] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Accepted: 01/15/2015] [Indexed: 06/04/2023]
Abstract
This review is the seventh update of the original article published in 1999 on the application of MALDI mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2012. General aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, and fragmentation are covered in the first part of the review and applications to various structural types constitute the remainder. The main groups of compound are oligo- and poly-saccharides, glycoproteins, glycolipids, glycosides, and biopharmaceuticals. Much of this material is presented in tabular form. Also discussed are medical and industrial applications of the technique, studies of enzyme reactions, and applications to chemical synthesis. © 2015 Wiley Periodicals, Inc. Mass Spec Rev 36:255-422, 2017.
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Affiliation(s)
- David J Harvey
- Department of Biochemistry, Oxford Glycobiology Institute, University of Oxford, Oxford, OX1 3QU, UK
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14
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Lee SP, Im HJ, Kang S, Chung SJ, Cho YS, Kang H, Park HS, Hwang DW, Park JB, Paeng JC, Cheon GJ, Lee YS, Jeong JM, Kim YJ. Noninvasive Imaging of Myocardial Inflammation in Myocarditis using 68Ga-tagged Mannosylated Human Serum Albumin Positron Emission Tomography. Am J Cancer Res 2017; 7:413-424. [PMID: 28042344 PMCID: PMC5197074 DOI: 10.7150/thno.15712] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 10/27/2016] [Indexed: 12/23/2022] Open
Abstract
The diagnosis of myocarditis traditionally relies on invasive endomyocardial biopsy but none of the imaging studies so far are specific for infiltration of the inflammatory cells itself. We synthesized 68Ga-2-(p-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA) mannosylated human serum albumin (MSA) by conjugating human serum albumin with mannose, followed by conjugation with NOTA and labeling it with 68Ga. The efficacy of 68Ga-NOTA-MSA positron emission tomography (PET) for imaging myocardial inflammation was tested in a rat myocarditis model. A significant number of mannose receptor-positive inflammatory cells infiltrated the myocardium in both human and rat myocarditis tissue. 68Ga-NOTA-MSA uptake was upregulated in organs of macrophage accumulation, such as liver, spleen, bone marrow and myocardium (0.32 (0.31~0.33) for normal versus 1.02 (0.86~1.06) for myocarditis (median (range), SUV); n=4~6 per group, p-value=0.01). 68Ga-NOTA-MSA uptake in the left ventricle was upregulated in myocarditis compared with normal rats (2.29 (1.42~3.40) for normal versus 4.18 (3.43~6.15) for myocarditis (median (range), average standard uptake value ratio against paraspinal muscle); n=6 per group, p-value<0.01), which was downregulated in rats with cyclosporine-A treated myocarditis (3.69 (2.59~3.86) for myocarditis versus 2.28 (1.76~2.60) for cyclosporine-A treated myocarditis; n=6 per group, p-value<0.01). The specificity of the tracer was verified by administration of excess non-labeled MSA. 68Ga-NOTA-MSA uptake was significantly enhanced earlier in the evolution of myocarditis before any signs of inflammation could be seen on echocardiography. These results demonstrate the potential utility of visualizing infiltration of mannose receptor-positive macrophages with 68Ga-NOTA-MSA PET in the early diagnosis of as well as in the monitoring of treatment response of myocarditis.
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15
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Kim EJ, Kim S, Seo HS, Lee YJ, Eo JS, Jeong JM, Lee B, Kim JY, Park YM, Jeong M. Novel PET Imaging of Atherosclerosis with 68Ga-Labeled NOTA-Neomannosylated Human Serum Albumin. J Nucl Med 2016; 57:1792-1797. [PMID: 27339872 DOI: 10.2967/jnumed.116.172650] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 05/16/2016] [Indexed: 01/28/2023] Open
Abstract
Activated macrophages take up 18F-FDG via glucose transporters, so this compound is useful for atherosclerosis imaging by PET. However, 18F-FDG application is limited for imaging of the heart and brain, in which glucose uptake is high, and in patients with aberrant glucose metabolism. The aims of this study were to confirm that mannosylated human serum albumin (MSA) specifically binds to the mannose receptor (MR) on macrophages and to test the feasibility of 68Ga-labeled NOTA-MSA for PET imaging of atherosclerotic plaques. METHODS The peritoneal macrophages of C57/B6 mice were collected, incubated with rhodamine B isothiocyanate-MSA (10 μg/mL), and evaluated by confocal microscopy and flow cytometry. The same evaluations were performed after preincubation of the macrophages with anti-CD206 MR blocking antibodies. NOTA-MSA was synthesized by conjugating 2-(p-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1,4,7-triacetic acid to MSA, followed by labeling with 68Ga. Rabbits with atherosclerotic aorta induced by a 3-mo cholesterol diet and chronic inflammation underwent consecutive PET/CT with 18F-FDG and 68Ga-NOTA-MSA at 2-d intervals. RESULTS The binding of MSA to MR and its dose-dependent reduction by preincubation with anti-CD206 MR blocking antibody were confirmed. Rhodamine B isothiocyanate and fluorescein isothiocyanate fluorescence colocalized at the atherosclerotic plaque. The 68Ga-NOTA-MSA SUVs of the atherosclerotic aorta were significantly higher than those of the healthy arteries and inferior vena cava and were comparable to those obtained with 18F-FDG. CONCLUSION These findings suggest that MR-specific 68Ga-NOTA-MSA is effective for detecting atherosclerosis in the aorta and is a promising radiopharmaceutical for imaging atherosclerosis because of the presence of M2 macrophages in atherosclerotic plaques.
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Affiliation(s)
- Eung Ju Kim
- Cardiovascular Center, Korea University Guro Hospital, Korea University College of Medicine, Seoul, South Korea
| | - Sungeun Kim
- Nuclear Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, South Korea
| | - Hong Seog Seo
- Cardiovascular Center, Korea University Guro Hospital, Korea University College of Medicine, Seoul, South Korea .,Korea University-Korea Institute of Science and Technology (KU-KIST) Graduate School of Converging Science and Technology, Seoul, South Korea
| | - Yong Jik Lee
- Cardiovascular Center, Korea University Guro Hospital, Korea University College of Medicine, Seoul, South Korea
| | - Jae Seon Eo
- Nuclear Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, South Korea
| | - Jae Min Jeong
- Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul, South Korea
| | - Boeun Lee
- Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul, South Korea
| | - Jae Young Kim
- Research Institute of Skin Imaging, Korea University College of Medicine, Seoul, South Korea; and
| | - Young Mi Park
- Department of Molecular Medicine, Ewha Womans University School of Medicine, Seoul, South Korea
| | - Myeongsook Jeong
- Department of Molecular Medicine, Ewha Womans University School of Medicine, Seoul, South Korea
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Ogura A, Kurbangalieva A, Tanaka K. Exploring the glycan interaction in vivo: Future prospects of neo-glycoproteins for diagnostics. Glycobiology 2016; 26:804-12. [PMID: 26980440 DOI: 10.1093/glycob/cww038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 03/09/2016] [Indexed: 12/21/2022] Open
Abstract
Herein the biodistributions and in vivo kinetics of chemically prepared neoglycoproteins are reviewed. Chemical methods can be used to conjugate various mono- and oligosaccharides onto a protein surface. The kinetics and organ-specific accumulation profiles of these glycoconjugates, which are introduced through intravenous injections, have been analyzed using conventional dissection studies as well as noninvasive methods such as single photon emission computed tomography, positron emission tomography and fluorescence imaging. These studies suggest that glycan-dependent protein distribution kinetics may be useful for pharmacological and diagnostic applications.
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Affiliation(s)
- Akihiro Ogura
- Biofunctional Synthetic Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Almira Kurbangalieva
- Biofunctional Chemistry Laboratory, A. Butlerov Institute of Chemistry, Kazan Federal University, 18 Kremlyovskaya street, Kazan 420008, Russia
| | - Katsunori Tanaka
- Biofunctional Synthetic Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan Biofunctional Chemistry Laboratory, A. Butlerov Institute of Chemistry, Kazan Federal University, 18 Kremlyovskaya street, Kazan 420008, Russia JST PRESTO, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
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Liu Z, Chen X. Simple bioconjugate chemistry serves great clinical advances: albumin as a versatile platform for diagnosis and precision therapy. Chem Soc Rev 2016; 45:1432-56. [PMID: 26771036 PMCID: PMC5227548 DOI: 10.1039/c5cs00158g] [Citation(s) in RCA: 282] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Albumin is the most abundant circulating protein in plasma and has recently emerged as a versatile protein carrier for drug targeting and for improving the pharmacokinetic profile of peptide or protein based drugs. Three drug delivery technologies related to albumin have been developed, which include the coupling of low-molecular weight drugs to exogenous or endogenous albumin, conjugating bioactive proteins by albumin fusion technology (AFT), and encapsulation of drugs into albumin nanoparticles. This review article starts with a brief introduction of human serum albumin (HSA), and then summarizes the mainstream chemical strategies of developing HSA binding molecules for coupling with drug molecules. Moreover, we also concisely condense the recent progress of the most important clinical applications of HSA-binding platforms, and specify the current challenges that need to be met for a bright future of HSA-binding.
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Affiliation(s)
- Zhibo Liu
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, USA.
| | - Xiaoyuan Chen
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, USA.
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18
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Tanaka K. Chemically synthesized glycoconjugates on proteins: effects of multivalency and glycoform in vivo. Org Biomol Chem 2016; 14:7610-21. [DOI: 10.1039/c6ob00788k] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The biodistributions and in vivo kinetics of chemically prepared glycoconjugates on proteins are reviewed.
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Affiliation(s)
- Katsunori Tanaka
- Biofunctional Synthetic Chemistry Laboratory
- RIKEN
- Wako-shi
- Japan
- Biofunctional Chemistry Laboratory
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19
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Hybrid lymph node imaging using 64Cu-labeled mannose-conjugated human serum albumin with and without indocyanine green. Nucl Med Commun 2015; 36:1026-34. [DOI: 10.1097/mnm.0000000000000353] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Yang BY, Moon SH, Seelam SR, Jeon MJ, Lee YS, Lee DS, Chung JK, Kim YI, Jeong JM. Development of a multimodal imaging probe by encapsulating iron oxide nanoparticles with functionalized amphiphiles for lymph node imaging. Nanomedicine (Lond) 2015; 10:1899-910. [DOI: 10.2217/nnm.15.41] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Aim: We tried to develop a multimodal iron oxide nanoparticles (IO NP) imaging probe by an encapsulation method using specific amphiphiles for 68Ga-labeling and lymph node-targeting. Materials & methods: Nanoparticles (NPs) were encapsulated with a solution containing polysorbate 60 and the amphiphiles. The prepared NPs were labeled with 68Ga and tested in vitro and in vivo. Results: Prepared 1,4,7-triazacyclononane-1,4,7-triacetic acid-IO-Mannose (NOTA-IO-Man) showed a narrow size distribution, and no significant aggregation or degradation under harsh conditions. The relaxivity coefficient of 68Ga-NOTA-IO-Man was higher than that of ferumoxide. The accumulation of 68Ga-NOTA-IO-Man in the lymph node after injection into rat's footpad was confirmed by both positron emission tomography and MRI. Conclusion: We successfully developed PET/MRI dual-modality imaging probe targeting lymph nodes by using the facile encapsulation method.
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Affiliation(s)
- Bo Yeun Yang
- Department of Nuclear Medicine & Institute of Radiation Medicine, Seoul National University College of Medicine, 110–799, Seoul, South Korea
| | - Sung-Hyun Moon
- Department of Nuclear Medicine & Institute of Radiation Medicine, Seoul National University College of Medicine, 110–799, Seoul, South Korea
| | - Sudhakara Reddy Seelam
- Department of Nuclear Medicine & Institute of Radiation Medicine, Seoul National University College of Medicine, 110–799, Seoul, South Korea
| | - Min Jeong Jeon
- Department of Radiology, Seoul National University Hospital, 110–744, Seoul, South Korea
| | - Yun-Sang Lee
- Department of Nuclear Medicine & Institute of Radiation Medicine, Seoul National University College of Medicine, 110–799, Seoul, South Korea
| | - Dong Soo Lee
- Department of Nuclear Medicine & Institute of Radiation Medicine, Seoul National University College of Medicine, 110–799, Seoul, South Korea
| | - June-Key Chung
- Department of Nuclear Medicine & Institute of Radiation Medicine, Seoul National University College of Medicine, 110–799, Seoul, South Korea
- Cancer Research Institute, Seoul National University College of Medicine, 110–799, Seoul, South Korea
| | - Young Il Kim
- Department of Radiology, Seoul National University Hospital, 110–744, Seoul, South Korea
| | - Jae Min Jeong
- Department of Nuclear Medicine & Institute of Radiation Medicine, Seoul National University College of Medicine, 110–799, Seoul, South Korea
- Cancer Research Institute, Seoul National University College of Medicine, 110–799, Seoul, South Korea
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Choi J, Jeong JM, Yoo BC, Hong MK, Kim YJ, Lee YS, Lee DS, Chung JK. Ga-68-labeled neolactosylated human serum albumin (LSA) for PET imaging of hepatic asialoglycoprotein receptor. Nucl Med Biol 2015; 42:53-8. [DOI: 10.1016/j.nucmedbio.2014.08.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Revised: 08/01/2014] [Accepted: 08/05/2014] [Indexed: 10/24/2022]
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Hachey KJ, Colson YL. Current innovations in sentinel lymph node mapping for the staging and treatment of resectable lung cancer. Semin Thorac Cardiovasc Surg 2014; 26:201-9. [PMID: 25527014 DOI: 10.1053/j.semtcvs.2014.09.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2014] [Indexed: 11/11/2022]
Abstract
Despite surgical resectability, early-stage lung cancer remains a challenge to cure. Survival outcomes are hindered by variable performance of adequate lymphadenectomy and the limitations of current pathologic nodal staging. Sentinel lymph node (SLN) mapping, a mainstay in the management of breast cancer and melanoma, permits targeted nodal sampling for efficient and accurate staging that can influence both intraoperative and adjuvant treatment decisions. Unfortunately, standard SLN identification techniques with blue dye and radiocolloid tracers have not been shown to be reproducible in lung cancer. In more recent years, intraoperative near-infrared image-guided lung SLN mapping has emerged as promising technology for the identification of the tumor-associated lymph nodes most likely to contain metastatic disease. Additionally, the clinical relevance of SLN mapping for lung cancer remains pressing, as the ability to identify micrometastatic disease in SLNs could facilitate trials to assess chemotherapeutic response and the clinical effect of occult nodal disease. This review outlines the status of lung cancer lymphatic mapping and techniques in development that may help close the gap between translational research in this field and routine clinical practice.
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Eo JS, Kim HK, Kim S, Lee YS, Jeong JM, Choi YH. Gallium-68 Neomannosylated Human Serum Albumin-Based PET/CT Lymphoscintigraphy for Sentinel Lymph Node Mapping in Non-small Cell Lung Cancer. Ann Surg Oncol 2014; 22:636-41. [DOI: 10.1245/s10434-014-3986-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Indexed: 12/15/2022]
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Kilian K. 68Ga-DOTA and analogs: Current status and future perspectives. Rep Pract Oncol Radiother 2014; 19:S13-S21. [PMID: 28443194 DOI: 10.1016/j.rpor.2014.04.016] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 03/28/2014] [Accepted: 04/23/2014] [Indexed: 12/18/2022] Open
Abstract
The construction of the 68Ge/68Ga generator has increased application of radiopharmaceuticals labeled with this isotope in medicine. 68Ga-PET is widely employed in the management of neuroendocrine tumors but favorable chemistry with tri- and tetraaza-ring molecules has opened wide range of 68Ga application in other fields of PET imaging. This review covers the radiopharmaceuticals labeled with gallium in molecular imaging and shows perspectives on the use of gallium-68 as a substitute for technetium-99, fluorine-18 and carbon-11 in some applications.
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Affiliation(s)
- Krzysztof Kilian
- Heavy Ion Laboratory, University of Warsaw, Pasteur 5a, 02093 Warsaw, Poland
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In vivo kinetics and biodistribution analysis of neoglycoproteins: effects of chemically introduced glycans on proteins. Glycoconj J 2014; 31:273-9. [DOI: 10.1007/s10719-014-9520-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 03/12/2014] [Accepted: 03/17/2014] [Indexed: 12/15/2022]
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Lee JY, Jeong JM, Kim YJ, Jeong HJ, Lee YS, Lee DS, Chung JK. Preparation of Ga-68-NOTA as a renal PET agent and feasibility tests in mice. Nucl Med Biol 2014; 41:210-5. [DOI: 10.1016/j.nucmedbio.2013.11.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Revised: 10/25/2013] [Accepted: 11/19/2013] [Indexed: 11/17/2022]
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Velikyan I. Prospective of ⁶⁸Ga-radiopharmaceutical development. Theranostics 2013; 4:47-80. [PMID: 24396515 PMCID: PMC3881227 DOI: 10.7150/thno.7447] [Citation(s) in RCA: 235] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 10/01/2013] [Indexed: 01/29/2023] Open
Abstract
Positron Emission Tomography (PET) experienced accelerated development and has become an established method for medical research and clinical routine diagnostics on patient individualized basis. Development and availability of new radiopharmaceuticals specific for particular diseases is one of the driving forces of the expansion of clinical PET. The future development of the ⁶⁸Ga-radiopharmaceuticals must be put in the context of several aspects such as role of PET in nuclear medicine, unmet medical needs, identification of new biomarkers, targets and corresponding ligands, production and availability of ⁶⁸Ga, automation of the radiopharmaceutical production, progress of positron emission tomography technologies and image analysis methodologies for improved quantitation accuracy, PET radiopharmaceutical regulations as well as advances in radiopharmaceutical chemistry. The review presents the prospects of the ⁶⁸Ga-based radiopharmaceutical development on the basis of the current status of these aspects as well as wide range and variety of imaging agents.
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Affiliation(s)
- Irina Velikyan
- 1. Preclinical PET Platform, Department of Medicinal Chemistry, Uppsala University, SE-75183 Uppsala, Sweden
- 2. PET-Centre, Centre for Medical Imaging, Uppsala University Hospital, SE-75185, Uppsala, Sweden
- 3. Department of Radiology, Oncology, and Radiation Science, Uppsala University, SE-75285 Uppsala, Sweden
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Oh Y, Lee YS, Quan YH, Choi Y, Jeong JM, Kim BM, Kim HK. Thoracoscopic color and fluorescence imaging system for sentinel lymph node mapping in porcine lung using indocyanine green-neomannosyl human serum albumin: intraoperative image-guided sentinel nodes navigation. Ann Surg Oncol 2013; 21:1182-8. [PMID: 24310791 DOI: 10.1245/s10434-013-3381-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Indexed: 01/05/2023]
Abstract
PURPOSE This study was performed to validate a newly developed sentinel lymph node (SLN) targeting tracer, indocyanine green-neomannosyl human serum albumin (ICG:MSA), and a thoracoscopic version of the intraoperative color and fluorescence imaging system (ICFIS) for lung cancer SLN mapping. METHODS ICG alone or ICG:MSA (5 μg/kg) was injected into the rat thigh, and the results were compared. The fluorescence signal-to-background ratios of SLNs were recorded and evaluated over a 2-h period by using ICFIS. Additionally, a SLN biopsy was performed via video-assisted thoracoscopic surgery with the use of ICG:MSA in porcine lung by using thoracoscopic ICFIS. RESULTS The newly developed ICG:MSA showed a significantly improved signal-to-background ratio compared with ICG alone throughout the trials. All SLNs were identified in both rats (ten SLNs in ten rat thighs) and pigs (ten SLNs in ten porcine lungs) under in vivo conditions. All SLNs were dissected successfully by using video-assisted thoracoscopic surgery with the help of thoracoscopic ICFIS. DISCUSSION ICG:MSA accumulates in the SLN by uptake and retention through the mannose-specific receptors on macrophages. Thoracoscopic ICFIS successfully assisted SLN mapping despite low near-infrared light transmission in the commercial thoracoscope. On the basis of the results of the thoracoscopic SLN mapping, we anticipate that ICG:MSA and thoracoscopic ICFIS can be translated to clinical trials in the near future.
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Affiliation(s)
- Yujin Oh
- Department of Bio-Convergence, Korea University, Seoul, Korea
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Kim SM, Choi N, Hwang S, Yim MS, Lee JS, Lee SM, Cho G, Ryu EK. Folate Receptor-Specific Positron Emission Tomography Imaging with Folic Acid-Conjugated Tissue Inhibitor of Metalloproteinase-2. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.11.3243] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kang CM, Koo HJ, Choe YS, Choi JY, Lee KH, Kim BT. ⁶⁸Ga-NODAGA-VEGF₁₂₁ for in vivo imaging of VEGF receptor expression. Nucl Med Biol 2013; 41:51-7. [PMID: 24183611 DOI: 10.1016/j.nucmedbio.2013.09.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 09/12/2013] [Accepted: 09/13/2013] [Indexed: 11/30/2022]
Abstract
PURPOSE Vascular endothelial growth factor (VEGF) is a crucial regulator of angiogenesis. In this study, we labeled VEGF₁₂₁ with (68)Ga using a hydrophilic chelating agent, NODAGA and evaluated the resulting (68)Ga-NODAGA-VEGF₁₂₁ for in vivo imaging of VEGF receptor (VEGFR) expression. METHODS NODAGA-VEGF₁₂₁ was prepared and its binding affinity for VEGFR2 was measured using (125)I-VEGF₁₂₁. (68)Ga-NODAGA-VEGF₁₂₁ was prepared by labeling NODAGA-VEGF₁₂₁ with (68)GaCl3 followed by purification using a PD-10 column. Human aortic endothelial cell (HAEC) binding studies of (68)Ga-NODAGA-VEGF₁₂₁ were performed at 37°C for 4 h. MicroPET imaging followed by biodistribution studies were performed in U87MG tumor-bearing mice injected with (68)Ga-NODAGA-VEGF₁₂₁. Immunofluorescence staining of the tumor tissues was performed to verify VEGFR2 expression. RESULTS Binding affinity of NODAGA-VEGF₁₂₁ for VEGFR2 was found to be comparable to that of VEGF₁₂₁. (68)Ga-NODAGA-VEGF₁₂₁ was prepared in 47.8% yield with specific activity of 3.4 GBq/mg. (68)Ga-NODAGA-VEGF₁₂₁ was avidly taken up by HAECs with a time-dependent increase from 9.88 %ID at 1 h to 20.86 %ID at 4h. MicroPET imaging of mice demonstrated high liver and spleen uptake with clear visualization of tumor at 1h after injection. ROI analysis of tumors revealed 2.53 ± 0.11 %ID/g at 4 h after injection. In the blocking study, tumor uptake was inhibited by 29% at 4 h. Subsequent biodistribution studies demonstrated tumor uptake of 2.38 ± 0.15 %ID/g. Immunofluorescence staining of the tumor tissues displayed high level of VEGFR2 expression. CONCLUSIONS These results demonstrate that (68)Ga-NODAGA-VEGF₁₂₁ led to VEGFR-specific distribution in U87MG tumor-bearing mice. This study also suggests that altered physicochemical properties of VEGF₁₂₁ after radiolabeling may affect biodistribution of the radiolabeled VEGF₁₂₁.
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Affiliation(s)
- Choong Mo Kang
- Department of Nuclear Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Ilwon-dong, Kangnam-ku, Seoul 135-710, Korea; Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul 135-710, Korea
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31
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Lee JH, Park DJ, Kim YH, Shin CM, Lee HS, Kim HH. Clinical Implementations of Preoperative Computed Tomography Lymphography in Gastric Cancer: A Comparison with Dual Tracer Methods in Sentinel Node Navigation Surgery. Ann Surg Oncol 2013; 20:2296-303. [DOI: 10.1245/s10434-012-2855-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Indexed: 12/23/2022]
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32
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Lee YK, Jeong JM, Hoigebazar L, Yang BY, Lee YS, Lee BC, Youn H, Lee DS, Chung JK, Lee MC. Nanoparticles Modified by Encapsulation of Ligands with a Long Alkyl Chain to Affect Multispecific and Multimodal Imaging. J Nucl Med 2012; 53:1462-70. [DOI: 10.2967/jnumed.111.092759] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Hoigebazar L, Jeong JM, Lee JY, Shetty D, Yang BY, Lee YS, Lee DS, Chung JK, Lee MC. Syntheses of 2-Nitroimidazole Derivatives Conjugated with 1,4,7-Triazacyclononane-N,N′-Diacetic Acid Labeled with F-18 Using an Aluminum Complex Method for Hypoxia Imaging. J Med Chem 2012; 55:3155-62. [DOI: 10.1021/jm201611a] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lathika Hoigebazar
- Radiation Applied Life Sciences,
Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul
National University College of Medicine, Seoul 110-744, Korea
- Cancer Research Institute, Seoul
National University College of Medicine, Seoul 110-744, Korea
| | - Jae Min Jeong
- Radiation Applied Life Sciences,
Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul
National University College of Medicine, Seoul 110-744, Korea
- Cancer Research Institute, Seoul
National University College of Medicine, Seoul 110-744, Korea
| | - Ji-Youn Lee
- Radiation Applied Life Sciences,
Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul
National University College of Medicine, Seoul 110-744, Korea
- Cancer Research Institute, Seoul
National University College of Medicine, Seoul 110-744, Korea
| | - Dinesh Shetty
- Radiation Applied Life Sciences,
Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul
National University College of Medicine, Seoul 110-744, Korea
- Cancer Research Institute, Seoul
National University College of Medicine, Seoul 110-744, Korea
| | - Bo Yeun Yang
- Radiation Applied Life Sciences,
Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul
National University College of Medicine, Seoul 110-744, Korea
- Cancer Research Institute, Seoul
National University College of Medicine, Seoul 110-744, Korea
| | - Yun-Sang Lee
- Radiation Applied Life Sciences,
Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul
National University College of Medicine, Seoul 110-744, Korea
- Cancer Research Institute, Seoul
National University College of Medicine, Seoul 110-744, Korea
| | - Dong Soo Lee
- Radiation Applied Life Sciences,
Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul
National University College of Medicine, Seoul 110-744, Korea
- Cancer Research Institute, Seoul
National University College of Medicine, Seoul 110-744, Korea
| | - June-Key Chung
- Radiation Applied Life Sciences,
Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul
National University College of Medicine, Seoul 110-744, Korea
- Cancer Research Institute, Seoul
National University College of Medicine, Seoul 110-744, Korea
| | - Myung Chul Lee
- Radiation Applied Life Sciences,
Department of Nuclear Medicine, Institute of Radiation Medicine, Seoul
National University College of Medicine, Seoul 110-744, Korea
- Cancer Research Institute, Seoul
National University College of Medicine, Seoul 110-744, Korea
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Evaluation of 111In-labeled macrocyclic chelator-amino acid derivatives for cancer imaging. Nucl Med Biol 2012; 39:325-33. [DOI: 10.1016/j.nucmedbio.2011.09.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 09/17/2011] [Accepted: 09/22/2011] [Indexed: 11/19/2022]
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(68)Ga-labeled radiopharmaceuticals for positron emission tomography. Nucl Med Mol Imaging 2010; 44:233-40. [PMID: 24899958 DOI: 10.1007/s13139-010-0056-6] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Accepted: 09/24/2010] [Indexed: 10/19/2022] Open
Abstract
(68)Ga is a promising emerging radionuclide for positron emission tomography (PET). It is produced using a (68)Ge/(68)Ga-generator, and thus, would enable the cyclotron-independent distribution of PET. However, new (68)Ga-labeled radiopharmaceuticals that can replace (18)F-labeled agents like [(18)F]fluorodeoxyglucose (FDG) are needed. Most of the (68)Ga-labeled derivatives currently used are peptide agents, but the developments of other agents, such as amino acid derivatives, nitroimidazole derivatives, and glycosylated human serum albumin, are being actively pursued in many laboratories. Thus, appearance of new (68)Ga-labeled radiopharmaceuticals with high impact are expected in the near future. Here, we present an overview of (68)Ga-labeled agents in terms of their clinical significances and relevances to the management of certain tumors, and pertinent pre-clinical developments.
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