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Mann G, Daksh S, Kumar N, Kaul A, Roy BG, Thirumal M, Datta A. Pre-clinical evaluation of 99mTc-labeled chalcone derivative for amyloid-β imaging post-head trauma. J Biol Inorg Chem 2024; 29:187-199. [PMID: 38607392 DOI: 10.1007/s00775-024-02049-x] [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: 06/19/2023] [Accepted: 02/08/2024] [Indexed: 04/13/2024]
Abstract
Aβ42 plaque formation is one of the preliminary pathologic events that occur post traumatic brain injury (TBI) which is also among the most noteworthy hallmarks of AD. Their pre symptomatic detection is therefore vital for better disease management. Chalcone-picolinic acid chelator derivative, 6-({[(6-carboxypyridin-2-yl)methyl](2-{4-[(2E)-3-[4-(dimethyl amino)phenyl]prop-2-enoyl]phenoxy}ethyl)amino}methyl)pyridine-2-carboxylic acid, Py-chal was synthesized to selectively identify amyloid plaques formed post head trauma using SPECT imaging by stable complexation to 99mTc with > 97% efficiency without compromising amyloid specificity. The binding potential of the Py-chal ligand to amyloid plaques remained high as confirmed by in vitro binding assay and photophysical spectra. Further, the Py-chal complex stained amyloid aggregates in the brain sections of rmTBI mice model. In vivo scintigraphy in TBI mice model displayed high uptake followed by high retention while the healthy rabbits displayed higher brain uptake followed by a rapid washout attributed to absence of amyloid plaques. Higher uptake in brain of TBI model was also confirmed by ex vivo biodistribution analysis wherein brain uptake of 3.38 ± 0.2% ID/g at 2 min p.i. was observed for TBI mice model. This was followed by prolonged retention and more than twofold higher activity as compared to sham mice brain. This preliminary data suggests the specificity of the radiotracer for amyloid detection post head trauma and applicability of 99mTc labeled Py-chal complex for TBI-induced β-amyloid SPECT imaging.
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Affiliation(s)
- Garima Mann
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Delhi, 110054, India
- Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Shivani Daksh
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Delhi, 110054, India
| | - Nikhil Kumar
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Delhi, 110054, India
| | - Ankur Kaul
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Delhi, 110054, India
| | - B G Roy
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Delhi, 110054, India
| | - M Thirumal
- Department of Chemistry, University of Delhi, Delhi, 110007, India.
| | - Anupama Datta
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Delhi, 110054, India.
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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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Dhillon S, Kinger M, Rani P, Chahal M, Kumari G, Aneja DK, Kim SW, Choi E, Kumar S. Advances in Aβ imaging probes: a comprehensive study of radiolabelled 1,3-diaryl-2-propen-1-ones for Alzheimer's disease: a review. RSC Adv 2023; 13:35877-35903. [PMID: 38090082 PMCID: PMC10712011 DOI: 10.1039/d3ra06258a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 11/09/2023] [Indexed: 04/26/2024] Open
Abstract
Alzheimer's disease (AD) is a formidable neurodegenerative disorder characterized by cognitive decline, memory impairment and inability to perform everyday tasks. In the pursuit of innovative diagnostic and therapeutic strategies, the synthesis and application of radiolabelled compounds have garnered significant attention. This review delves into the synthesis and biological significance of radiolabelled 1,3-diaryl-2-propen-1-ones, commonly known as chalcones, as Aβ imaging probes for AD. These versatile chalcone derivatives have demonstrated noteworthy potential as radiotracers for visualizing Aβ imaging probes, which are hallmark pathologies of AD. This review encompasses an exploration of chalcone synthesis via diverse methodologies and their biological implications, both as standalone entities and as precursors for intricate natural products. In addition, the pivotal role of advanced imaging techniques, such as single-photon emission computed tomography (SPECT) and positron emission tomography (PET), using various radioisotopes is highlighted. The use of radiopharmaceutical agents, including [18F]FDG, [18F]FMAPO, [11C]6-Me-BTA-1, [124/125I]IBETA, and [64Cu]YW-7 as potent tools for early diagnosis and therapeutic advancement is explored. This review underscores the critical nexus between radiolabelled chalcones and their pivotal role in advancing diagnostic and therapeutic paradigms in AD research. Furthermore, this study encapsulated the role of radiolabelled chalcone emphasizing their prospective implications for drug development and therapeutic interventions. A focal point of paramount significance is the elucidation of Aβ imaging probes and its important role in the combat against AD, with a particular emphasis on their role in facilitating early diagnosis and fostering advancements in therapeutic strategies.
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Affiliation(s)
- Sudeep Dhillon
- Department of Chemistry, Chaudhary Bansi Lal University Bhiwani 127031 Haryana India
| | - Mayank Kinger
- Department of Chemistry, Chaudhary Bansi Lal University Bhiwani 127031 Haryana India
| | - Priyanka Rani
- Department of Chemistry, Chaudhary Bansi Lal University Bhiwani 127031 Haryana India
| | - Mamta Chahal
- Department of Chemistry, Chaudhary Bansi Lal University Bhiwani 127031 Haryana India
| | - Ginna Kumari
- Department of Chemistry, Chaudhary Bansi Lal University Bhiwani 127031 Haryana India
| | - Deepak Kumar Aneja
- Department of Chemistry, Chaudhary Bansi Lal University Bhiwani 127031 Haryana India
| | - Sang Wook Kim
- Department of Advanced Materials Chemistry, Dongguk University Gyeongju 38066 Republic of Korea
| | - Eunseok Choi
- Department of Advanced Materials Chemistry, Dongguk University Gyeongju 38066 Republic of Korea
| | - Sushil Kumar
- Biozenta Lifescience Pvt. Ltd Ind. Area Tahliwal Una HP 174303 India
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Capponi PC, Mari M, Ferrari E, Asti M. Radiolabeled Chalcone Derivatives as Potential Radiotracers for β-Amyloid Plaques Imaging. Molecules 2023; 28:molecules28073233. [PMID: 37049995 PMCID: PMC10096019 DOI: 10.3390/molecules28073233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 03/30/2023] [Accepted: 04/03/2023] [Indexed: 04/09/2023] Open
Abstract
Natural products often provide a pool of pharmacologically relevant precursors for the development of various drug-related molecules. In this review, the research performed on some radiolabeled chalcone derivatives characterized by the presence of the α-β unsaturated carbonyl functional group as potential radiotracers for the imaging of β-amyloids plaques will be summarized. Chalcones’ structural modifications and chemical approaches which allow their radiolabeling with the most common SPECT (Single Photon Emission Computed Tomography) and PET (Positron Emission Tomography) radionuclides will be described, as well as the state of the art regarding their in vitro binding affinity and in vivo biodistribution and pharmacokinetics in preclinical studies. Moreover, an explanation of the rationale behind their potential utilization as probes for Alzheimer’s disease in nuclear medicine applications will be provided.
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Affiliation(s)
- Pier Cesare Capponi
- Radiopharmaceutical Chemistry Section, Nuclear Medicine Unit, AUSL-IRCCS di Reggio Emilia, Viale Risorgimento 80, 42122 Reggio Emilia, Italy
| | - Matteo Mari
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy
| | - Erika Ferrari
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy
| | - Mattia Asti
- Radiopharmaceutical Chemistry Section, Nuclear Medicine Unit, AUSL-IRCCS di Reggio Emilia, Viale Risorgimento 80, 42122 Reggio Emilia, Italy
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Nakaie M, Katayama F, Nakagaki T, Yoshida S, Kawasaki M, Nishi K, Ogawa K, Toriba A, Nishida N, Nakayama M, Fuchigami T. Synthesis and Biological Evaluation of Novel 2-(Benzofuran-2-yl)-chromone Derivatives for In Vivo Imaging of Prion Deposits in the Brain. ACS Infect Dis 2022; 8:1869-1882. [PMID: 35969484 DOI: 10.1021/acsinfecdis.2c00142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Prion diseases are fatal neurodegenerative disorders caused by the deposition of scrapie prion protein aggregates (PrPSc) in the brain. We previously reported that styrylchromone (SC) and benzofuran (BF) derivatives have potential as imaging probes for PrPSc. To further improve their properties, we designed and synthesized 2-(benzofuran-2-yl)-chromone (BFC) derivatives hybridized with SC and BF backbones as novel single-photon emission computed tomography probes for the detection of cerebral PrPSc deposits. Recombinant mouse prion protein (rMoPrP) aggregates and mouse-adapted bovine spongiform encephalopathy (mBSE)-infected mice were used to evaluate the binding properties of BFC derivatives to PrPSc. The BFC derivatives exhibited high binding affinities (equilibrium dissociation constant [Kd] = 22.6-47.7 nM) for rMoPrP aggregates. All BFC derivatives showed remarkable selectivity against amyloid beta aggregates. Fluorescence microscopy confirmed that the fluorescence signals of the BFC derivatives corresponded to the antibody-positive deposits of PrPSc in mBSE-infected mouse brains. Among the BFC derivatives, [125I]BFC-OMe and [125I]BFC-NH2 exhibited high brain uptake and favorable washout from the mouse brain. In vitro autoradiography demonstrated that the distribution of [125I]BFC-OMe in the brain tissues of mBSE-infected mice was colocalized with PrPSc deposits. Taken together, BFC derivatives appear to be promising prion imaging probes.
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Affiliation(s)
- Mari Nakaie
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Fumihiro Katayama
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Takehiro Nakagaki
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Sakura Yoshida
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Masao Kawasaki
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Kodai Nishi
- Department of Radioisotope Medicine, Atomic Bomb Disease Institute, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Kazuma Ogawa
- Laboratory of Clinical Analytical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan.,Institute for Frontier Science Initiative, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan
| | - Akira Toriba
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Noriyuki Nishida
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Morio Nakayama
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Takeshi Fuchigami
- Laboratory of Clinical Analytical Sciences, Graduate School, Division of Pharmaceutical Sciences, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan
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Zhang H, Wang Y, Wang Y, Li X, Wang S, Wang Z. Recent advance on carbamate-based cholinesterase inhibitors as potential multifunctional agents against Alzheimer's disease. Eur J Med Chem 2022; 240:114606. [PMID: 35858523 DOI: 10.1016/j.ejmech.2022.114606] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 07/08/2022] [Accepted: 07/09/2022] [Indexed: 12/17/2022]
Abstract
Alzheimer's disease (AD), as the fourth leading cause of death among the elderly worldwide, has brought enormous challenge to the society. Due to its extremely complex pathogeneses, the development of multi-target directed ligands (MTDLs) becomes the major strategy for combating AD. Carbamate moiety, as an essential building block in the development of MTDLs, exhibits structural similarity to neurotransmitter acetylcholine (ACh) and has piqued extensive attention in discovering multifunctional cholinesterase inhibitors. To date, numerous preclinical studies demonstrate that carbamate-based cholinesterase inhibitors can prominently increase the level of ACh and improve cognition impairments and behavioral deficits, providing a privileged strategy for the treatment of AD. Based on the recent research focus on the novel cholinesterase inhibitors with multiple biofunctions, this review aims at summarizing and discussing the most recent studies excavating the potential carbamate-based MTDLs with cholinesterase inhibition efficacy, to accelerate the pace of pleiotropic cholinesterase inhibitors for coping AD.
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Affiliation(s)
- Honghua Zhang
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, China
| | - Yuying Wang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Yuqing Wang
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, China
| | - Xuelin Li
- School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Shuzhi Wang
- School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Zhen Wang
- The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China; School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
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7
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Mann G, Chauhan K, Kumar V, Daksh S, Kumar N, Thirumal M, Datta A. Bio-Evaluation of 99mTc-Labeled Homodimeric Chalcone Derivative as Amyloid-β-Targeting Probe. Front Med (Lausanne) 2022; 9:813465. [PMID: 35783620 PMCID: PMC9249127 DOI: 10.3389/fmed.2022.813465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 05/24/2022] [Indexed: 11/19/2022] Open
Abstract
Chalcone derivatives have been successfully utilized for a range of biological applications and can cross the blood–brain barrier easily. β-amyloid-specific bis-chalcone derivative, 6,9-bis(carboxymethyl)-14-(4-[(E)-3-(4-(dimethylamino)phenyl)acryloyl]phenoxy)-3-(2-[(2-(4-[(E)-3-(4-(dimethylamino)phenyl)acryloyl]phenoxy)ethyl)amino]-2-oxoethyl)-11-oxo-3,6,9,12-tetraazatetradecanoic acid, DT(Ch)2, was analyzed using molecular modeling to explain the binding modes of the ligand with amyloid fibril and monomer followed by 99mTc-complexation in 95% yield and 98.7% efficiency. High-binding specificity of the radiocomplex was established following in vitro evaluation against 100-fold excess of DT(Ch)2. 99mTc–DT(Ch)2 exhibited <3% trans-complexation in human serum after 24 h, indicating high stability. A fast clearance rate in pharmacokinetics studies displayed a biphasic pattern with t1/2(F) = 30 min ± 0.09 and t1/2(S) = 4 h 20 min ± 0.06. In vivo single-photon emission computed tomography (SPECT) imaging in rabbits reiterated the pharmacokinetics data with initially high brain uptake followed by rapid washout. Biodistribution studies confirmed the initial brain uptake as 1.16 ± 0.02% ID/g after 2 min and the brain2min/brain30min ratio was 3.74. Radioactivity distribution in the brain was >40% in the cingulate cortex followed by >25% in the hippocampus, a distribution pattern aligned to Alzheimer’s affected brain regions. Radiocomplex also displayed rapid plasma clearance followed by hepatobolic and renal modes of excretion.
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Affiliation(s)
- Garima Mann
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, New Delhi, India
- Department of Chemistry, University of Delhi, New Delhi, India
| | - Kanchan Chauhan
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Mexico
| | - Vikas Kumar
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, New Delhi, India
| | - Shivani Daksh
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, New Delhi, India
| | - Nikhil Kumar
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, New Delhi, India
| | - M. Thirumal
- Department of Chemistry, University of Delhi, New Delhi, India
| | - Anupama Datta
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, New Delhi, India
- *Correspondence: Anupama Datta, ;
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Thapa P, Upadhyay SP, Suo WZ, Singh V, Gurung P, Lee ES, Sharma R, Sharma M. Chalcone and its analogs: Therapeutic and diagnostic applications in Alzheimer's disease. Bioorg Chem 2021; 108:104681. [PMID: 33571811 PMCID: PMC7928223 DOI: 10.1016/j.bioorg.2021.104681] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 12/15/2020] [Accepted: 01/20/2021] [Indexed: 02/08/2023]
Abstract
Chalcone [(E)-1,3-diphenyl-2-propene-1-one], a small molecule with α, β unsaturated carbonyl group is a precursor or component of many natural flavonoids and isoflavonoids. It is one of the privileged structures in medicinal chemistry. It possesses a wide range of biological activities encouraging many medicinal chemists to study this scaffold for its usefulness to oncology, infectious diseases, virology and neurodegenerative diseases including Alzheimer's disease (AD). Small molecular size, convenient and cost-effective synthesis, and flexibility for modifications to modulate lipophilicity suitable for blood brain barrier (BBB) permeability make chalcones a preferred candidate for their therapeutic and diagnostic potential in AD. This review summarizes and highlights the importance of chalcone and its analogs as single target small therapeutic agents, multi-target directed ligands (MTDLs) as well as molecular imaging agents for AD. The information summarized here will guide many medicinal chemist and researchers involved in drug discovery to consider chalcone as a potential scaffold for the development of anti-AD agents including theranostics.
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Affiliation(s)
- Pritam Thapa
- Drug Discovery Program, Midwest Veterans' Biomedical Research Foundation, KCVA Medical Center, Kansas City, MO 64128, USA.
| | - Sunil P Upadhyay
- Drug Discovery Program, Midwest Veterans' Biomedical Research Foundation, KCVA Medical Center, Kansas City, MO 64128, USA
| | - William Z Suo
- Laboratory for Alzheimer's Disease & Aging Research, Veterans Affairs Medical Center, Kansas City, MO 64128, USA
| | - Vikas Singh
- Division of Neurology, KCVA Medical Center, Kansas City, MO, USA
| | - Prajwal Gurung
- Inflammation Program, University of Iowa, Iowa City, IA 52242, USA
| | - Eung Seok Lee
- College of Pharmacy, Yeungnam University, Gyeongsan 712-749, Republic of Korea
| | - Ram Sharma
- Drug Discovery Program, Midwest Veterans' Biomedical Research Foundation, KCVA Medical Center, Kansas City, MO 64128, USA
| | - Mukut Sharma
- Drug Discovery Program, Midwest Veterans' Biomedical Research Foundation, KCVA Medical Center, Kansas City, MO 64128, USA
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Design, synthesis and evaluation of novel dimethylamino chalcone-O-alkylamines derivatives as potential multifunctional agents against Alzheimer's disease. Eur J Med Chem 2021; 216:113310. [PMID: 33667847 DOI: 10.1016/j.ejmech.2021.113310] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 02/05/2021] [Accepted: 02/18/2021] [Indexed: 02/07/2023]
Abstract
A novel series of dimethylamino chalcone-O-alkylamines derivatives was designed and synthesized as multifunctional agents for the treatment of AD. All the target compounds exhibited significant abilities to inhibit and disaggregate Aβ aggregation, and acted as potential selective AChE inhibitors, biometal chelators and selective MAO-B inhibitors. Among these compounds, compound TM-6 showed the greatest inhibitory activity against self-induced Aβ aggregation (IC50 = 0.88 μM) and well disaggregation ability toward self-induced Aβ aggregation (95.1%, 25 μM), the TEM images, molecular docking study and molecular dynamics simulations provided reasonable explanation for its high efficiency, and it was also found to be a remarkable antioxidant (ORAC-FL values of 2.1eq.), the best AChE inhibitor (IC50 = 0.13 μM) and MAO-B inhibitor (IC50 = 1.0 μM), as well as a good neuroprotectant. UV-visual spectrometry and ThT fluorescence assay revealed that compound TM-6 was not only a good biometal chelator by inhibiting Cu2+-induced Aβ aggregation (95.3%, 25 μM) but also could disassemble the well-structured Aβ fibrils (88.1%, 25 μM). Further, TM-6 could cross the blood-brain barrier (BBB) in vitro. More importantly, compound TM-6 did not show any acute toxicity in mice at doses of up to 1000 mg/kg and improved scopolamine-induced memory impairment. Taken together, these data indicated that TM-6, an excellent balanced multifunctional inhibitor, was a potential lead compound for the treatment of AD.
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Fuchigami T, Kawasaki M, Watanabe H, Nakagaki T, Nishi K, Sano K, Atarashi R, Nakaie M, Yoshida S, Ono M, Nishida N, Nakayama M. Feasibility studies of radioiodinated pyridyl benzofuran derivatives as potential SPECT imaging agents for prion deposits in the brain. Nucl Med Biol 2020; 90-91:41-48. [PMID: 32979726 DOI: 10.1016/j.nucmedbio.2020.09.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 08/30/2020] [Accepted: 09/14/2020] [Indexed: 12/26/2022]
Abstract
INTRODUCTION Prion diseases are fatal neurodegenerative disorders caused by the deposition of abnormal prion protein aggregates (PrPSc) in the central nervous system. This study aimed to evaluate the use of iodinated pyridyl benzofuran (IPBF) derivatives as single-photon emission computed tomography (SPECT) probes for the detection of cerebral PrPSc deposits. METHODS In vitro binding assays of IPBF derivatives were carried out in the recombinant mouse prion protein (rMoPrP) and brain sections of mouse-adapted bovine spongiform encephalopathy (mBSE)-infected mice. SPECT imaging of 5-(5-[123I]iodobenzofuran-2-yl)-N-methylpyridin-2-amine ([123I]IPBF-NHMe) was performed on mBSE-infected and mock-infected mice. RESULTS Fluorescence microscopy results showed that fluorescence signals of IPBF derivatives corresponded to the thioflavin-T positive amyloid deposits of PrPSc in the brain sections of mouse-adapted bovine spongiform encephalopathy (mBSE)-infected mice. Among the IPBF derivatives, 5-(5-iodobenzofuran-2-yl)-N-methylpyridin-2-amine (IPBF-NHMe) exhibited the highest binding affinity to the recombinant mouse prion protein (rMoPrP) aggregates with a Ki of 14.3 nM. SPECT/computed tomography (CT) imaging and ex vivo autoradiography demonstrated that the [123I]IPBF-NHMe distribution in brain tissues of mBSE-infected mice co-localized with PrPSc deposits. CONCLUSION [123I]IPBF-NHMe appears to be a prospective SPECT tracer for monitoring prion deposits in living brain tissues.
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Affiliation(s)
- Takeshi Fuchigami
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
| | - Masao Kawasaki
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Hiroyuki Watanabe
- Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Takehiro Nakagaki
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Kodai Nishi
- Department of Radioisotope Medicine, Atomic Bomb Disease Institute, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Kazunori Sano
- Department of Physiology and Pharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, 814-0180 Fukuoka, Japan
| | - Ryuichiro Atarashi
- Division of Microbiology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, 5200 Kiyotake-cho, Miyazaki 889-1692, Japan
| | - Mari Nakaie
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Sakura Yoshida
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Masahiro Ono
- Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Noriyuki Nishida
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Morio Nakayama
- Department of Hygienic Chemistry, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
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Mathew B, Parambi DGT, Sivasankarapillai VS, Uddin MS, Suresh J, Mathew GE, Joy M, Marathakam A, Gupta SV. Perspective Design of Chalcones for the Management of CNS Disorders: A Mini-Review. CNS & NEUROLOGICAL DISORDERS-DRUG TARGETS 2020; 18:432-445. [PMID: 31187716 DOI: 10.2174/1871527318666190610111246] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 04/09/2019] [Accepted: 04/24/2019] [Indexed: 11/22/2022]
Abstract
The development of chalcone-based compounds for CNS disorders has been explored by many research groups. Chalcones are being considered as a potent organic scaffold with widespread applications in the field of drug discovery and medicinal chemistry. The planar or semi-planar geometry of chalcones with various functionalities impinged on the terminal aromatic systems renders the molecule its bio-activity including anti-cancer, anti-malarial, anti-microbial, anti-fungal, antileishmanial, anti-viral, anti-diabetic, anti-hypertensive properties, etc. Moreover, cutting-edge research has been executed in the domain of Central Nervous System (CNS) based scheme, further, their identification and classifications also remain of high interest in the field of medicinal chemistry but the specific reviews are limited. Hence, the present review highlights the significance of chalcones toward their CNS activities (up to 2019), which include anti-depressant activity, anxiolytic activity, activity with GABA receptors, acetylcholinesterase (AChE) and butyryl cholinesterase (BChE) inhibitions, activity as adenosine receptor antagonists anti-Alzheimer's agents, β-amyloid plaques imaging agents, monoamine oxidase inhibition. To our knowledge, this is the first review exclusively for CNS activity profile of chalcones.
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Affiliation(s)
- Bijo Mathew
- Division of Drug Design and Medicinal Chemistry Research Lab, Department of Pharmaceutical Chemistry, Ahalia School of Pharmacy, Palakkad 678557, Kerala, India
| | | | | | - Md Sahab Uddin
- Department of Pharmacy, Southeast University, Dhaka, Bangladesh.,Pharmakon Neuroscience Research Network, Dhaka, Bangladesh
| | - Jerad Suresh
- Department of Pharmaceutical Chemistry, College of Pharmacy, Madras Medical College, Chennai 600004, India
| | | | - Monu Joy
- School of Pure & Applied Physics, M.G. University, Kottayam 686560, India
| | - Akash Marathakam
- Department of Pharmaceutical Chemistry, National College of Pharmacy, Calicut 673602, Kerala, India
| | - Sheeba Varghese Gupta
- Department of Pharmaceutical Sciences, College of Pharmacy, University of South Florida, Tampa, FL 33612, United States
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12
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Fuchigami T. [Development of Molecular Probes for Live Imaging of Cancer and Infectious Diseases]. YAKUGAKU ZASSHI 2020; 139:1531-1538. [PMID: 31787640 DOI: 10.1248/yakushi.19-00158] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Positron emission tomography (PET) and single photon emission computed tomography (SPECT) are powerful molecular imaging methods for examining disease-related factors in the whole body using specific imaging probes. Recently, we tried to develop molecular imaging probes that specifically visualize pathological factors associated with cancers and infectious diseases. Although survivin is highly expressed in several cancers, its expression is undetectable in non-dividing tissues. Thus, we developed several small molecular imaging probes that target survivin. These ligands not only showed high affinity for survivin protein, but also showed consistent cellular accumulation with respect to survivin expression levels, thereby indicating the feasibility of their backbones as scaffolds for tumor-specific imaging agents that target survivin. Prion diseases are fatal neurodegenerative diseases characterized by the deposition of amyloid plaques containing abnormal prion protein aggregates (PrPSc). Thus, we developed flavonoids, acridines, and benzofurans as PrPSc-imaging probes. A styrylchromone derivative ([123I]SC-OMe) appears to be a particularly promising SPECT radioligand for monitoring prion deposit levels in living brains. Gallium-68 is a positron emitter in clinical PET applications that can be produced by a 68Ge/68Ga generator without a cyclotron. Notably, we developed new adsorbents for 68Ge by introducing N-methylglucamine groups into the Sephadex series to serve as a hydrophilic polymer matrix. We also demonstrated that generator-eluted 68Ga-citrate could be used for PET imaging of infectious mouse models. Our polysaccharide-based 68Ge/68Ga generators were shown to be prospectively cost-effective production systems for 68Ga radiopharmaceuticals. This Review describes the major findings of these three studies and the future prospect of these fields.
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13
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Dorababu A. Critical evaluation of current Alzheimer's drug discovery (2018-19) & futuristic Alzheimer drug model approach. Bioorg Chem 2019; 93:103299. [PMID: 31586701 DOI: 10.1016/j.bioorg.2019.103299] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 09/14/2019] [Accepted: 09/16/2019] [Indexed: 12/17/2022]
Abstract
Alzheimer's disease (AD), a neurodegenerative disease responsible for death of millions of people worldwide is a progressive clinical disorder which causes neurons to degenerate and ultimately die. It is one of the common causes of dementia wherein a person's incapability to independently think, behave and decline in social skills can be quoted as major symptoms. However the early signs include the simple non-clinical symptoms such as forgetting recent events and conversations. Onset of these symptoms leads to worsened conditions wherein the AD patient suffers severe memory impairment and eventually becomes unable to work out everyday tasks. Even though there is no complete cure for AD, rigorous research has been going on to reduce the progress of AD. Currently, a very few clinical drugs are prevailing for AD treatment. So this is the need of hour to design, develop and discovery of novel anti-AD drugs. The main factors for the cause of AD according to scientific research reveals structural changes in brain proteins such as beta amyloid, tau proteins into plaques and tangles respectively. The abnormal proteins distort the neurons. Despite the high potencies of the synthesized molecules; they could not get on the clinical tests up to human usage. In this review article, the recent research carried out with respect to inhibition of AChE, BuChE, NO, BACE1, MAOs, Aβ, H3R, DAPK, CSF1R, 5-HT4R, PDE, σ1R and GSK-3β is compiled and organized. The summary is focused mainly on cholinesterases, Aβ, BACE1 and MAOs classes of potential inhibitors. The review also covers structure activity relationship of most potent compounds of each class of inhibitors alongside redesign and remodeling of the most significant inhibitors in order to expect cutting edge inhibitory properties towards AD. Alongside the molecular docking studies of the some final compounds are discussed.
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Affiliation(s)
- Atukuri Dorababu
- Department of Studies in Chemistry, SRMPP Govt. First Grade College, Huvinahadagali 583219, Karnataka, India.
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14
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Zhang X, Song Q, Cao Z, Li Y, Tian C, Yang Z, Zhang H, Deng Y. Design, synthesis and evaluation of chalcone Mannich base derivatives as multifunctional agents for the potential treatment of Alzheimer’s disease. Bioorg Chem 2019; 87:395-408. [DOI: 10.1016/j.bioorg.2019.03.043] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 02/22/2019] [Accepted: 03/15/2019] [Indexed: 01/28/2023]
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15
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Colucci-Guyon E, Batista AS, Oliveira SDS, Blaud M, Bellettini IC, Marteyn BS, Leblanc K, Herbomel P, Duval R. Ultraspecific live imaging of the dynamics of zebrafish neutrophil granules by a histopermeable fluorogenic benzochalcone probe. Chem Sci 2019; 10:3654-3670. [PMID: 30996961 PMCID: PMC6432617 DOI: 10.1039/c8sc05593a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 02/12/2019] [Indexed: 12/13/2022] Open
Abstract
Neutrophil granules (NGs) are key components of the innate immune response and mark the development of neutrophilic granulocytes in mammals. However, there has been no specific fluorescent vital stain up to now to monitor their dynamics within a whole live organism. We rationally designed a benzochalcone fluorescent probe (HAB) featuring high tissue permeability and optimal photophysics such as elevated quantum yield, pronounced solvatochromism and target-induced fluorogenesis. Phenotypic screening identified HAB as the first cell- and organelle-specific small-molecule fluorescent tracer of NGs in live zebrafish larvae, with no labeling of other cell types or organelles. HAB staining was independent of the state of neutrophil activation, labeling NGs of both resting and phagocytically active neutrophils with equal specificity. By high-resolution live imaging, we documented the dynamics of HAB-stained NGs during phagocytosis. Upon zymosan injection, labeled NGs were rapidly recruited to the forming phagosomes. Despite being a reversible ligand, HAB could not be displaced by high concentrations of pharmacologically relevant competing chalcones, indicating that this specific labeling was the result of the HAB's precise physicochemical signature rather than a general feature of chalcones. However, one of the competitors was discovered as a promising interstitial fluorescent tracer illuminating zebrafish histology, similarly to BODIPY-ceramide. As a yellow-emitting histopermeable vital stain, HAB functionally and spectrally complements most genetically incorporated fluorescent tags commonly used in live zebrafish biology, holding promise for the study of neutrophil-dependent responses relevant to human physiopathology such as developmental defects, inflammation and infection. Furthermore, HAB intensely labeled isolated live human neutrophils at the level of granulated subcellular structures consistent with human NGs, suggesting that the labeling of NGs by HAB is not restricted to the zebrafish model but also relevant to mammalian systems.
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Affiliation(s)
- Emma Colucci-Guyon
- Institut Pasteur , Unité Macrophages et Développement de l'Immunité , Paris , 75015 , France .
- CNRS , UMR 3738 , Paris , France
| | - Ariane S Batista
- Nanotechnology Engineering Program , Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia - COPPE , Universidade Federal do Rio de Janeiro , Rio de Janeiro , 21941-972 , Brazil
| | | | - Magali Blaud
- LCRB , CNRS , Université Paris 5 , Sorbonne Paris Cité , Paris , 75006 , France
| | - Ismael C Bellettini
- Departamento de Ciências Exatas e Educaçao , Universidade Federal de Santa Catarina , Blumenau , 89036-256 , Brazil
| | - Benoit S Marteyn
- Institut Pasteur , Unité de Pathogénie Microbienne Moléculaire , Paris , 75015 , France
- INSERM , UMR 786 , Paris , France
| | - Karine Leblanc
- BioCIS , CNRS , Université Paris-Sud 11 , Châtenay-Malabry , 92290 , France
| | - Philippe Herbomel
- Institut Pasteur , Unité Macrophages et Développement de l'Immunité , Paris , 75015 , France .
- CNRS , UMR 3738 , Paris , France
| | - Romain Duval
- MERIT , IRD , Université Paris 5 , Sorbonne Paris Cité , Paris , 75006 , France .
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Multi-targetable chalcone analogs to treat deadly Alzheimer’s disease: Current view and upcoming advice. Bioorg Chem 2018; 80:86-93. [DOI: 10.1016/j.bioorg.2018.06.009] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 05/21/2018] [Accepted: 06/03/2018] [Indexed: 12/19/2022]
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17
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Savelieff MG, Nam G, Kang J, Lee HJ, Lee M, Lim MH. Development of Multifunctional Molecules as Potential Therapeutic Candidates for Alzheimer’s Disease, Parkinson’s Disease, and Amyotrophic Lateral Sclerosis in the Last Decade. Chem Rev 2018; 119:1221-1322. [DOI: 10.1021/acs.chemrev.8b00138] [Citation(s) in RCA: 270] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Masha G. Savelieff
- SciGency Science Communications, Ann Arbor, Michigan 48104, United States
| | - Geewoo Nam
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Juhye Kang
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Hyuck Jin Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Misun Lee
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Mi Hee Lim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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Watanabe H, Saji H, Ono M. Novel fluorescence probes based on the chalcone scaffold for in vitro staining of β-amyloid plaques. Bioorg Med Chem Lett 2018; 28:3242-3246. [PMID: 30131243 DOI: 10.1016/j.bmcl.2018.08.009] [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] [Received: 06/09/2018] [Revised: 07/30/2018] [Accepted: 08/07/2018] [Indexed: 11/28/2022]
Abstract
The β-amyloid (Aβ) plaque is one of the neuropathological hallmarks in the Alzheimer's disease brain. The detection of Aβ plaques with fluorescence probes is useful for preclinical studies of Alzheimer's disease. In this study, we developed four novel fluorescence probes based on chalcone scaffold. In an in vitro binding study, all FCH derivatives showed moderate binding affinity for Aβ(1-42) aggregates (Ki = 72-114 nM). The fluorescence intensities of FCH-3 and FCH-4 dramatically changed in the presence of Aβ(1-42) aggregates (6.7 and 14.2 fold), but the changes of FCH-1 and FCH-2 were minor (2.0 and 2.4 fold). In a fluorescence staining study using Tg2576 mouse brain sections, FCH-3 and FCH-4 clearly visualized Aβ plaques, but FCH-1 and FCH-2 did not stain. Taken together, all FCH derivatives could bind to Aβ aggregates, but only FCH-3 and FCH-4 may be useful fluorescence probes for in vitro staining of Aβ plaques.
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Affiliation(s)
- Hiroyuki Watanabe
- Department of Patho-Functional Bioanalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - 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
| | - 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.
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19
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Conversion of iodine to fluorine-18 based on iodinated chalcone and evaluation for β-amyloid PET imaging. Bioorg Med Chem 2018; 26:3352-3358. [PMID: 29751990 DOI: 10.1016/j.bmc.2018.05.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 05/01/2018] [Accepted: 05/02/2018] [Indexed: 01/19/2023]
Abstract
In the amyloid cascade hypothesis, β-amyloid (Aβ) plaques is one of the major pathological biomarkers in the Alzheimer's disease (AD) brain. We report the synthesis and evaluation of novel radiofluorinated chalcones, [18F]4-dimethylamino-4'-fluoro-chalcone ([18F]DMFC) and [18F]4'-fluoro-4-methylamino-chalcone ([18F]FMC), as Aβ imaging probes. The conversion of iodine directly introduced to the chalcone backbone into fluorine was successfully carried out by 18F-labeling via the corresponding boronate precursors, achieving the direct introduction of fluorine-18 into the chalcone backbone to prepare [18F]DMFC and [18F]FMC. In a biodistribution study using normal mice, [18F]DMFC and [18F]FMC showed a higher initial uptake (4.43 and 5.47% ID/g at 2 min postinjection, respectively) into and more rapid clearance (0.52 and 0.66% ID/g at 30 min postinjection, respectively) from the brain than a Food and Drug Administration (FDA)-approved Aβ imaging agent ([18F]Florbetapir), meaning the improvement of the probability of detecting Aβ plaques and the reduction of non-specific binding in the brain. In the in vitro binding studies using aggregates of recombinant Aβ peptides, [18F]DMFC and [18F]FMC showed high binding affinity to recombinant Aβ aggregates at the Kd values of 4.47 and 6.50 nM, respectively. In the in vitro autoradiography (ARG) experiment with AD brain sections, [18F]DMFC and [18F]FMC markedly accumulated only in a region with abundant Aβ plaques, indicating that they clearly recognized human Aβ plaques in vitro. These encouraging results suggest that [18F]DMFC and [18F]FMC may be promising PET probes for the detection of an amyloid pathology and the early diagnosis of AD with marked accuracy.
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20
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Design, synthesis and biological evaluation of 4′-aminochalcone-rivastigmine hybrids as multifunctional agents for the treatment of Alzheimer's disease. Bioorg Med Chem 2017; 25:1030-1041. [DOI: 10.1016/j.bmc.2016.12.013] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 12/03/2016] [Accepted: 12/08/2016] [Indexed: 11/18/2022]
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21
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Development of alkoxy styrylchromone derivatives for imaging of cerebral amyloid-β plaques with SPECT. Bioorg Med Chem Lett 2015; 25:3363-7. [DOI: 10.1016/j.bmcl.2015.05.048] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Revised: 05/15/2015] [Accepted: 05/18/2015] [Indexed: 11/18/2022]
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22
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Preliminary Characterization and In Vivo Studies of Structurally Identical (18)F- and (125)I-Labeled Benzyloxybenzenes for PET/SPECT Imaging of β-Amyloid Plaques. Sci Rep 2015; 5:12084. [PMID: 26170205 PMCID: PMC4501006 DOI: 10.1038/srep12084] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Accepted: 06/01/2015] [Indexed: 11/23/2022] Open
Abstract
With the assistance of molecular docking and 3D-QSAR models established previously, structurally identical 18F- and 125I-labeled benzyloxybenzene derivatives were designed to achieve the early detection of Aβ plaques by PET/SPECT imaging. In competition binding assay, ligands 7a and 12a displayed high binding affinities to Aβ42 aggregates with Ki values of 19.5 nM and 23.9 nM, respectively. Specific plaque labeling was observed on the in vitro autoradiography of brain sections from AD patients and Tg mice. In biodistribution, [125I]7a, [18F]7a, [125I]12a and [18F]12a all exhibited high initial brain uptakes (>5% ID/g at 2 min). [125I]7a and [125I]12a cleared fast from the normal brain regions, while corresponding [18F]7a and [18F]12a showed slow washout rates. Dynamic microPET/CT and microSPECT/CT imaging data in normal ICR mice were in accordance with in vivo biodistribution results. In vivo metabolism results indicated that the different clearance profiles between the structurally identical 18F- and 125I-labeled tracers could be attributed to different biochemical characteristics of the radiometabolites. Radioiodinated benzyloxybenzene derivatives exhibited good in vivo biostability in brain. Ex vivo autoradiography further confirmed the strong in vivo Aβ labeling ability of [125I]7a. These new fluorinated and iodinated benzyloxybenzenes can develop into PET/SPECT dual imaging agents targeting Aβ plaques.
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Koh D. Crystal structure of (E)-3-(2,4-di-meth-oxy-phen-yl)-1-(1-hy-droxy-naphthalen-2-yl)prop-2-en-1-one. Acta Crystallogr Sect E Struct Rep Online 2014; 70:o1034-5. [PMID: 25309211 PMCID: PMC4186154 DOI: 10.1107/s1600536814018704] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 08/18/2014] [Indexed: 11/16/2022]
Abstract
In the title compound, C21H18O4, the C=C bond of the central enone group adopts an E conformation. The dihedral angle formed by the benzene ring and the naphthalene ring system is 6.60 (2)°. The meth-oxy groups on the benzene ring are essentially coplanar with the ring; the C-C-O-C torsion angles being 1.6 (2) and -177.1 (1)°. The hy-droxy group attached to the naphthalene ring is involved in an intra-molecular O-H⋯O hydrogen bond. The relative conformation of the two double bonds in the enone group is s-cisoid. In the crystal, weak C-H⋯O hydrogen bonds link the mol-ecules into chains propagating along [010].
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Affiliation(s)
- Dongsoo Koh
- Department of Applied Chemistry, Dongduk Women’s University, Seoul 136-714, Republic of Korea
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