1
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Chisholm TS, Hunter CA. A closer look at amyloid ligands, and what they tell us about protein aggregates. Chem Soc Rev 2024; 53:1354-1374. [PMID: 38116736 DOI: 10.1039/d3cs00518f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
The accumulation of amyloid fibrils is characteristic of neurodegenerative diseases such as Alzheimer's disease (AD) and Parkinson's disease. Detecting these fibrils with fluorescent or radiolabelled ligands is one strategy for diagnosing and better understanding these diseases. A vast number of amyloid-binding ligands have been reported in the literature as a result. To obtain a better understanding of how amyloid ligands bind, we have compiled a database of 3457 experimental dissociation constants for 2076 unique amyloid-binding ligands. These ligands target Aβ, tau, or αSyn fibrils, as well as relevant biological samples including AD brain homogenates. From this database significant variation in the reported dissociation constants of ligands was found, possibly due to differences in the morphology of the fibrils being studied. Ligands were also found to bind to Aβ(1-40) and Aβ(1-42) fibrils with similar affinities, whereas a greater difference was found for binding to Aβ and tau or αSyn fibrils. Next, the binding of ligands to fibrils was shown to be largely limited by the hydrophobic effect. Some Aβ ligands do not fit into this hydrophobicity-limited model, suggesting that polar interactions can play an important role when binding to this target. Finally several binding site models were outlined for amyloid fibrils that describe what ligands target what binding sites. These models provide a foundation for interpreting and designing site-specific binding assays.
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Affiliation(s)
- Timothy S Chisholm
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1 EW, UK.
| | - Christopher A Hunter
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1 EW, UK.
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2
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Okumura Y, Maya Y, Onishi T, Shoyama Y, Izawa A, Nakamura D, Tanifuji S, Tanaka A, Arano Y, Matsumoto H. Design, Synthesis, and Preliminary Evaluation of SPECT Probes for Imaging β-Amyloid in Alzheimer's Disease Affected Brain. ACS Chem Neurosci 2018; 9:1503-1514. [PMID: 29580057 DOI: 10.1021/acschemneuro.8b00064] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
In this study, we synthesized of a series of 2-phenyl- and 2-pyridyl-imidazo[1,2- a]pyridine derivatives and examine their suitability as novel probes for single-photon emission computed tomography (SPECT)-based imaging of β-amyloid (Aβ). Among the 11 evaluated compounds, 10 showed moderate affinity to Aβ(1-42) aggregates, exhibiting half-maximal inhibitory concentrations (IC50) of 14.7 ± 6.07-87.6 ± 39.8 nM. In vitro autoradiography indicated that 123I-labeled triazole-substituted derivatives displayed highly selective binding to Aβ plaques in the hippocampal region of Alzheimer's disease (AD)-affected brain. Moreover, biodistribution studies performed on normal rats demonstrated that all 123I-labeled probes featured high initial uptake into the brain followed by a rapid washout and were thus well suited for imaging Aβ plaques, with the highest selectivity observed for a 1 H-1,2,3-triazole-substituted 2-pyridyl-imidazopyridine derivative, [123I]ABC577. This compound showed good kinetics in rat brain as well as moderate in vivo stability in rats and is thus a promising SPECT imaging probe for AD in clinical settings.
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Affiliation(s)
- Yuki Okumura
- Research Centre, Nihon Medi-Physics Co., Ltd., 3-1, Kitasode, Sodegaura City, Chiba 299-0266, Japan
- Department of Molecular Imaging and Radiotherapy, Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Yoshifumi Maya
- Research Centre, Nihon Medi-Physics Co., Ltd., 3-1, Kitasode, Sodegaura City, Chiba 299-0266, Japan
| | - Takako Onishi
- Research Centre, Nihon Medi-Physics Co., Ltd., 3-1, Kitasode, Sodegaura City, Chiba 299-0266, Japan
| | - Yoshinari Shoyama
- Research Centre, Nihon Medi-Physics Co., Ltd., 3-1, Kitasode, Sodegaura City, Chiba 299-0266, Japan
| | - Akihiro Izawa
- Research Centre, Nihon Medi-Physics Co., Ltd., 3-1, Kitasode, Sodegaura City, Chiba 299-0266, Japan
| | - Daisaku Nakamura
- Research Centre, Nihon Medi-Physics Co., Ltd., 3-1, Kitasode, Sodegaura City, Chiba 299-0266, Japan
| | - Shigeyuki Tanifuji
- Research Centre, Nihon Medi-Physics Co., Ltd., 3-1, Kitasode, Sodegaura City, Chiba 299-0266, Japan
| | - Akihiro Tanaka
- Research Centre, Nihon Medi-Physics Co., Ltd., 3-1, Kitasode, Sodegaura City, Chiba 299-0266, Japan
| | - Yasushi Arano
- Department of Molecular Imaging and Radiotherapy, Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Hiroki Matsumoto
- Research Centre, Nihon Medi-Physics Co., Ltd., 3-1, Kitasode, Sodegaura City, Chiba 299-0266, Japan
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3
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Cavina L, van der Born D, Klaren PHM, Feiters MC, Boerman OC, Rutjes FPJT. Design of Radioiodinated Pharmaceuticals: Structural Features Affecting Metabolic Stability towards in Vivo Deiodination. European J Org Chem 2017; 2017:3387-3414. [PMID: 28736501 PMCID: PMC5499721 DOI: 10.1002/ejoc.201601638] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Indexed: 11/09/2022]
Abstract
Radioiodinated pharmaceuticals are convenient tracers for clinical and research investigations because of the relatively long half-lives of radioactive iodine isotopes (i.e., 123I, 124I, and 131I) and the ease of their chemical insertion. Their application in radionuclide imaging and therapy may, however, be hampered by poor in vivo stability of the C-I bond. After an overview of the use of iodine in biology and nuclear medicine, we present here a survey of the catabolic pathways for iodinated xenobiotics, including their biodistribution, accumulation, and biostability. We summarize successful rational improvements in the biostability and conclude with general guidelines for the design of stable radioiodinated pharmaceuticals. It appears to be necessary to consider the whole molecule, rather than the radioiodinated fragment alone. Iodine radionuclides are generally retained in vivo on sp2 carbon atoms in iodoarenes and iodovinyl moieties, but not in iodinated heterocycles or on sp3 carbon atoms. Iodoarene substituents also have an influence, with increased in vivo deiodination in the cases of iodophenols and iodoanilines, whereas methoxylation and difluorination improve biostability.
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Affiliation(s)
- Lorenzo Cavina
- Institute of Molecules and MaterialsFaculty of ScienceRadboud UniversityHeyendaalseweg 1356525 AJ NijmegenNetherlands
- FutureChemistry Holding BV6525 ECNijmegenNetherlands
- Department of Animal Ecology & PhysiologyInstitute of Water & Wetland ResearchFaculty of ScienceRadboud UniversityPOB 90106500 GLNijmegenNetherlands
| | | | - Peter H. M. Klaren
- Department of Animal Ecology & PhysiologyInstitute of Water & Wetland ResearchFaculty of ScienceRadboud UniversityPOB 90106500 GLNijmegenNetherlands
| | - Martin C. Feiters
- Institute of Molecules and MaterialsFaculty of ScienceRadboud UniversityHeyendaalseweg 1356525 AJ NijmegenNetherlands
| | - Otto C. Boerman
- Department of Radiology & Nuclear MedicineRadboud University Medical Center6500 HBNijmegenthe Netherlands
| | - Floris P. J. T. Rutjes
- Institute of Molecules and MaterialsFaculty of ScienceRadboud UniversityHeyendaalseweg 1356525 AJ NijmegenNetherlands
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4
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Yu S, Qi L, Hu K, Gong J, Cheng T, Wang Q, Chen J, Wu H. The Development of a Palladium-Catalyzed Tandem Addition/Cyclization for the Construction of Indole Skeletons. J Org Chem 2017; 82:3631-3638. [DOI: 10.1021/acs.joc.7b00148] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shuling Yu
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Linjun Qi
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Kun Hu
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Julin Gong
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Tianxing Cheng
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Qingzong Wang
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Jiuxi Chen
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Huayue Wu
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
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5
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Acid-mediated aryl migration reaction of C-3 aryl substituted pyrrolidinoindolines. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2016.11.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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6
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Jia J, Song J, Dai J, Liu B, Cui M. Optically Pure Diphenoxy Derivatives as More Flexible Probes for β-Amyloid Plaques. ACS Chem Neurosci 2016; 7:1275-82. [PMID: 27337293 DOI: 10.1021/acschemneuro.6b00155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The highly rigid and planar scaffold with π-conjugated systems has been widely considered to be indispensable for Aβ binding probes. However, the flexible benzyloxybenzene derivative [(125)I]BOB-4 represents an excellent lead candidate for targeting Aβ in AD brains. Based on that, we designed two pairs of more flexible and optically pure diphenoxy derivatives with a chiral center as novel Aβ probes. These compounds possessed high affinity (Ki = 15.8-45.0 nM) for Aβ1-42 aggregates, and (R)-enantiomers showed slightly better binding ability than (S)-enantiomers. In addition, the competition binding assay implied that the optically pure diphenoxy derivatives with more flexible geometry shared the same binding site as IMPY, a classical rigid and planar Aβ probe. For (125)I-radiolabeled enantiomers, (S)-[(125)I]5 and (R)-[(125)I]5, specific plaque labeling on brain sections of Tg mice and AD patients were observed in in vitro autoradiography, persuasively proving the excellent affinity of the probes. In biodistribution, (S)-[(125)I]5 and (R)-[(125)I]5 with relatively low lipophilicity exhibited moderate initial brain uptake (4.37% and 3.72% ID/g at 2 min, respectively) and extremely fast washout from normal mice brain (brain2min/brain60min = 19.0 and 17.7, respectively). In summary, the separate enantiomers displayed similar properties in vitro and in vivo, and (S/R)-[(123)I]5 may be potential SPECT probes for recognizing Aβ plaques in AD brains.
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Affiliation(s)
- Jianhua Jia
- Key
Laboratory of Radiopharmaceuticals, Ministry of Education, College
of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Jia Song
- Key
Laboratory of Radiopharmaceuticals, Ministry of Education, College
of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Jiapei Dai
- Wuhan
Institute for Neuroscience and Neuroengineering, South-Central University for Nationalities, Wuhan 430074, P. R. China
| | - Boli Liu
- Key
Laboratory of Radiopharmaceuticals, Ministry of Education, College
of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Mengchao Cui
- Key
Laboratory of Radiopharmaceuticals, Ministry of Education, College
of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
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7
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Jiang Y, Liu Z, Holenz J, Yang H. Competitive Intelligence–based Lead Generation and Fast Follower Approaches. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/9783527677047.ch08] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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8
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Watanabe H, Ono M, Iikuni S, Kimura H, Okamoto Y, Ihara M, Saji H. Synthesis and biological evaluation of 123I-labeled pyridyl benzoxazole derivatives: novel β-amyloid imaging probes for single-photon emission computed tomography. RSC Adv 2015. [DOI: 10.1039/c4ra10742j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The result in the present study suggested that [123I]9 may be a potential SPECT probe for imaging β-amyloid plaques in the brains of patient with Alzheimer's disease.
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Affiliation(s)
- Hiroyuki Watanabe
- Department of Patho-Functional Bioanalysis
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
| | - Masahiro Ono
- Department of Patho-Functional Bioanalysis
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
| | - Shimpei Iikuni
- Department of Patho-Functional Bioanalysis
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
| | - Hiroyuki Kimura
- Department of Patho-Functional Bioanalysis
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
| | - Yoko Okamoto
- Department of Pathology
- National Cerebral and Cardiovascular Center
- Suita
- Japan
| | - Masafumi Ihara
- Department of Stroke and Cerebrovascular Diseases
- National Cerebral and Cardiovascular Center
- Suita
- Japan
| | - Hideo Saji
- Department of Patho-Functional Bioanalysis
- Graduate School of Pharmaceutical Sciences
- Kyoto University
- Kyoto 606-8501
- Japan
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9
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Yang Y, Cui M. Radiolabeled bioactive benzoheterocycles for imaging β-amyloid plaques in Alzheimer's disease. Eur J Med Chem 2014; 87:703-21. [DOI: 10.1016/j.ejmech.2014.10.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 09/29/2014] [Accepted: 10/04/2014] [Indexed: 01/30/2023]
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10
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Nakazono M, Obayashi K, Sasamoto K, Tomiyoshi K, Suenaga G, Ando Y. Novel styrylbenzene derivatives for detecting amyloid deposits. Clin Chim Acta 2014; 436:27-34. [PMID: 24815035 DOI: 10.1016/j.cca.2014.04.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 04/08/2014] [Accepted: 04/28/2014] [Indexed: 11/25/2022]
Abstract
BACKGROUND Various styrylbenzene compounds were synthesized and evaluated as mainly Aβ amyloid sensors. These compounds, however, cannot be used for detecting amyloid deposition in peripheral nerves because of the inherent sensitivity of the compounds. These compounds often generate false positives especially in the basement membrane of blood vessels in histochemical studies. To overcome these problems, we must first synthesize other styryl compounds for detecting amyloid fibrils in tissues. METHODS A wide variety of symmetrical and unsymmetrical styrylbenzene derivatives were synthesized and then these compounds were used to detect amyloid fibrils in autopsy and biopsy samples from patients with various systemic and localized forms of amyloidosis such as familial amyloidotic polyneuropathy (FAP), senile systemic amyloidosis (SSA), amyloid A (AA) amyloidosis, localized AL amyloidosis, and Alzheimer's disease. RESULTS 1-Methoxy-2,5-bis-styrylbenzene and 2-(2-(2-fluoroethoxy)ethoxy)ethoxy)-2,5-bis-styrylbenzene (EEEFSB) detected amyloid fibrils in both in vitro and in vivo histopathological studies. 1-Methoxy-2,5-bis-styrylbenzene also showed a high strength of fluorescence with amyloid deposition in peripheral nerves in a patient with FAP. CONCLUSIONS 1-Methoxy-2,5-bis-styrylbenzene and EEEFSB may prove a useful tool for diagnosing amyloidosis, not only in a histochemical study but also in whole body amyloid positron emission tomography (PET) imaging.
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Affiliation(s)
- Manabu Nakazono
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
| | - Konen Obayashi
- Diagnostic Unit for Amyloidosis, Department of Laboratory Medicine, Kumamoto University Hospital, 1-1-1 Honjo, Kumamoto 860-8556, Japan
| | - Kazumi Sasamoto
- Dojindo Laboratories, 2025-5 Tabaru, Mashiki-machi, Kumamoto 861-2202, Japan
| | - Katsumi Tomiyoshi
- Department of Clinical Radiation Technology, Graduate School of Health Sciences, Kumamoto University, 4-24-1 Kuhonji, Kumamoto 862-0976, Japan
| | - Genki Suenaga
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto 860-8556, Japan
| | - Yukio Ando
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto 860-8556, Japan
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11
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Rossy C, Fouquet E, Felpin FX. Practical synthesis of indoles and benzofurans in water using a heterogeneous bimetallic catalyst. Beilstein J Org Chem 2013; 9:1426-31. [PMID: 23946838 PMCID: PMC3740569 DOI: 10.3762/bjoc.9.160] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Accepted: 06/25/2013] [Indexed: 11/23/2022] Open
Abstract
This paper describes the preparation of indoles, azaindoles and benzofurans in pure water by using a new heterogeneous Pd–Cu/C catalyst through a cascade Sonogashira alkynylation–cyclization sequence. Details of the optimization studies and the substrate scope are discussed. This procedure allows the preparation of heterocycles with good yields and is tolerant to a wide variety of functional groups.
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Affiliation(s)
- Cybille Rossy
- Université de Bordeaux, UMR CNRS 5255, ISM, 351 cours de la Libération, 33405 Talence Cedex, France ; Université de Nantes, UFR Sciences et Techniques, UMR CNRS 6230, CEISAM, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France
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12
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Fu H, Yu L, Cui M, Zhang J, Zhang X, Li Z, Wang X, Jia J, Yang Y, Yu P, Jia H, Liu B. Synthesis and biological evaluation of 18F-labled 2-phenylindole derivatives as PET imaging probes for β-amyloid plaques. Bioorg Med Chem 2013; 21:3708-14. [PMID: 23673220 DOI: 10.1016/j.bmc.2013.04.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 04/13/2013] [Accepted: 04/15/2013] [Indexed: 11/28/2022]
Affiliation(s)
- Hualong Fu
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, PR China
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13
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Li Z, Cui M, Dai J, Wang X, Yu P, Yang Y, Jia J, Fu H, Ono M, Jia H, Saji H, Liu B. Novel Cyclopentadienyl Tricarbonyl Complexes of 99mTc Mimicking Chalcone as Potential Single-Photon Emission Computed Tomography Imaging Probes for β-Amyloid Plaques in Brain. J Med Chem 2013; 56:471-82. [DOI: 10.1021/jm3014184] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zijing Li
- Key Laboratory
of Radiopharmaceuticals,
Ministry of Education, College of Chemistry, Beijing Normal University,
Beijing 100875, P. R. China
| | - Mengchao Cui
- Key Laboratory
of Radiopharmaceuticals,
Ministry of Education, College of Chemistry, Beijing Normal University,
Beijing 100875, P. R. China
| | - Jiapei Dai
- Wuhan Institute for Neuroscience
and Neuroengineering, South-Central University for Nationalities,
Wuhan 430074, P. R. China
| | - Xuedan Wang
- Key Laboratory
of Radiopharmaceuticals,
Ministry of Education, College of Chemistry, Beijing Normal University,
Beijing 100875, P. R. China
| | - Pingrong Yu
- Key Laboratory
of Radiopharmaceuticals,
Ministry of Education, College of Chemistry, Beijing Normal University,
Beijing 100875, P. R. China
| | - Yanping Yang
- Key Laboratory
of Radiopharmaceuticals,
Ministry of Education, College of Chemistry, Beijing Normal University,
Beijing 100875, P. R. China
| | - Jianhua Jia
- Key Laboratory
of Radiopharmaceuticals,
Ministry of Education, College of Chemistry, Beijing Normal University,
Beijing 100875, P. R. China
| | - Hualong Fu
- Key Laboratory
of Radiopharmaceuticals,
Ministry of Education, College of Chemistry, Beijing Normal University,
Beijing 100875, P. R. China
| | - Masahiro Ono
- Department of Patho-Functional
Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto University,
46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hongmei Jia
- Key Laboratory
of Radiopharmaceuticals,
Ministry of Education, College of Chemistry, Beijing Normal University,
Beijing 100875, P. R. China
| | - Hideo Saji
- Department of Patho-Functional
Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto University,
46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Boli Liu
- Key Laboratory
of Radiopharmaceuticals,
Ministry of Education, College of Chemistry, Beijing Normal University,
Beijing 100875, P. R. China
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14
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Corcoran EB, Williams AB, Hanson RN. A synthetic method for palladium-catalyzed stannylation at the 5- and 6-benzo positions of indoles. Org Lett 2012; 14:4630-3. [PMID: 22928631 DOI: 10.1021/ol302076d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The stannylation of indole derivatives proceeds in good yields under palladium catalysis (5 mol %) without protection of the indolic nitrogen. The general utility of both PdCl(2)(PhCN)(2)/PCy(3) and Pd(2)dba(3)/PCy(3) as catalytic systems for the stannylation of three indole derivatives, with varying degrees of electron density, is presented.
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Affiliation(s)
- Emily B Corcoran
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, USA
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15
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Wang X, Cui M, Yu P, Li Z, Yang Y, Jia H, Liu B. Synthesis and biological evaluation of novel technetium-99m labeled phenylbenzoxazole derivatives as potential imaging probes for β-amyloid plaques in brain. Bioorg Med Chem Lett 2012; 22:4327-31. [DOI: 10.1016/j.bmcl.2012.05.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 05/02/2012] [Accepted: 05/04/2012] [Indexed: 11/28/2022]
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16
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(E)-5-styryl-1H-indole and (E)-6-styrylquinoline derivatives serve as probes for β-amyloid plaques. Molecules 2012; 17:4252-65. [PMID: 22491675 PMCID: PMC6268995 DOI: 10.3390/molecules17044252] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 03/28/2012] [Accepted: 03/29/2012] [Indexed: 11/17/2022] Open
Abstract
We report the synthesis and biological evaluation of novel (E)-5-styryl-1H-indole and (E)-6-styrylquinoline derivatives as probes for imaging β-amyloid (Aβ) plaques. These derivatives showed binding affinities for Aβ1–40 aggregates with Ki values varying from 4.1 to 288.4 nM. (E)-5-(4-iodostyryl)-1H-indole (8) clearly stained Aβ plaques in the brain sections of Alzheimer’s disease (AD) model mice (APP/PS1). Furthermore, autoradiography for [125I]8 displayed intense and specific labeling of Aβ plaques in the brain sections mentioned above with low background. In biodistribution experiments using normal mice [125I]8 showed high initial brain uptake followed by rapid washout (4.27 and 0.64% ID/g at 2 and 30 min post injection, respectively). These findings suggests that [123I]8 may be a potential SPECT imaging agent for detecting Aβ plaques in AD brain.
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17
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Ribeiro Morais G, Paulo A, Santos I. A Synthetic Overview of Radiolabeled Compounds for β‐Amyloid Targeting. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101449] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Goreti Ribeiro Morais
- Group of Radiopharmaceutical Sciences, Institute Tecnologic and Nuclear, Estrada Nacional 10, 2686‐953 Sacavém, Portugal
| | - António Paulo
- Group of Radiopharmaceutical Sciences, Institute Tecnologic and Nuclear, Estrada Nacional 10, 2686‐953 Sacavém, Portugal
| | - Isabel Santos
- Group of Radiopharmaceutical Sciences, Institute Tecnologic and Nuclear, Estrada Nacional 10, 2686‐953 Sacavém, Portugal
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18
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Unusual reactivity of β-(3-indolyl)-α,β-unsaturated ketones. 2-Acetylvinyl group removal by phenylhydrazine hydrochloride. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.07.136] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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19
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20
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SPECT Imaging Agents for Detecting Cerebral β-Amyloid Plaques. INTERNATIONAL JOURNAL OF MOLECULAR IMAGING 2011; 2011:543267. [PMID: 21603239 PMCID: PMC3094870 DOI: 10.1155/2011/543267] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 11/06/2010] [Accepted: 01/24/2011] [Indexed: 11/17/2022]
Abstract
The development of radiotracers for use in vivo to image β-amyloid (Aβ) plaques in cases of Alzheimer's disease (AD) is an important, active area of research. The presence of Aβ aggregates in the brain is generally accepted as a hallmark of AD. Since the only definitive diagnosis of AD is by postmortem staining of affected brain tissue, the development of techniques which enable one to image Aβ plaques in vivo has been strongly desired. Furthermore, the quantitative evaluation of Aβ plaques in the brain could facilitate evaluation of the efficacy of antiamyloid therapies currently under development. This paper reviews the current situation in the development of agents for SPECT-based imaging of Aβ plaques in Alzheimer's brains.
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Cui M, Ono M, Kimura H, Liu B, Saji H. Synthesis and Structure−Affinity Relationships of Novel Dibenzylideneacetone Derivatives as Probes for β-Amyloid Plaques. J Med Chem 2011; 54:2225-40. [DOI: 10.1021/jm101404k] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Mengchao Cui
- Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Masahiro Ono
- Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hiroyuki Kimura
- Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Boli Liu
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Hideo Saji
- Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
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Nakazono M, Saita K, Oshikawa Y, Tani K, Nanbu S, Zaitsu K. Fluorescence properties of 2-aryl substituted indoles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 78:905-908. [PMID: 21177140 DOI: 10.1016/j.saa.2010.11.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Revised: 10/09/2010] [Accepted: 11/29/2010] [Indexed: 05/30/2023]
Abstract
The fluorescence properties of 2-phenylindole, 2-naphthylindole and 2-anthracenylindole were investigated. 2-Anthracenylindole was newly synthesized by Suzuki-Miyaura's coupling. The fluorescence quantum yield of 2-phenylindole was the highest and the fluorescence emission maximum wavelength of 2-anthracenylindole was the longest. The ab initio quantum chemical calculation of the 2-anthracenylindole showed that the HOMO and LUMO of 2-anthracenylindole were localized in the anthracene moiety.
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Affiliation(s)
- Manabu Nakazono
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
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