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Kempf O, Ullmann GM, Schobert R, Kempf K, Bombarda E. Chemoselective Attachment of the Water-Soluble Dark Quencher Hydrodabcyl to Amino Groups in Peptides and Preservation of Its Spectroscopic Properties over a Wide pH Range. ACS OMEGA 2021; 6:32896-32903. [PMID: 34901640 PMCID: PMC8655893 DOI: 10.1021/acsomega.1c04891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Accepted: 11/04/2021] [Indexed: 06/14/2023]
Abstract
The water-soluble quencher hydrodabcyl can be activated as an N-succinimidyl ester that is readily accessible from crude hydrodabcyl and storable for a long time. With primary and secondary amines, it reacts swiftly and chemoselectively, even in the presence of other competing nucleophiles such as those typically present in natural peptides. One of the three phenolic OH groups of hydrodabcyl is amenable to selective mono-Boc protection resulting in reduced polarity, advantageous to its further use in organic synthesis. The advantages of hydrodabcyl over dabcyl in spectrometric applications are exemplified by the pH dependence of its absorbance spectra.
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Affiliation(s)
- Oxana Kempf
- Department
of Biochemistry, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany
| | - G. Matthias Ullmann
- Computational
Biochemistry, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany
| | - Rainer Schobert
- Organic
Chemistry Laboratory, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany
| | - Karl Kempf
- ISM, University of Bordeaux, 351 Cours de la Libération, 33405 Talence, France
| | - Elisa Bombarda
- Department
of Biochemistry, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany
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2
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Spyrou B, Hungnes IN, Mota F, Bordoloi J, Blower PJ, White JM, Ma MT, Donnelly PS. Oxorhenium(V) and Oxotechnetium(V) Complexes of N 3S Tetradentate Ligands with a Styrylpyridyl Functional Group: Toward Imaging Agents to Assist in the Diagnosis of Alzheimer's Disease. Inorg Chem 2021; 60:13669-13680. [PMID: 34424670 DOI: 10.1021/acs.inorgchem.1c01992] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Alzheimer's disease (AD) is associated with the presence of amyloid plaques in the brain mainly comprised of aggregated forms of amyloid-β (Aβ). Molecules radiolabeled with technetium-99m that cross the blood-brain barrier (BBB) and selectively bind to Aβ plaques have the potential to assist in the diagnosis of AD using single-photon emission computed tomography imaging. In this work, three new tetradentate ligands of pyridyl, amide, amine and thiol donors, featuring a styrylpyridyl group that is known to interact with amyloid plaques, were prepared. The new ligands formed charge-neutral and lipophilic complexes with the [Tc═O]3+ and [Re═O]3+ motifs, and two rhenium complexes were characterized by X-ray crystallography. The rhenium(V) complexes interact with synthetic Aβ1-40 and amyloid plaques on human brain tissue. Two of the new ligands were radiolabeled with 99mTc using a kit-based approach, and their biodistribution in wild-type mice was evaluated. The presence of amide donors in the tetradentate ligand increased the stability of the respective [Tc═O]3+ complexes but reduced brain uptake. While the complexes were able to cross the BBB, the degree of uptake in the brain was not sufficient to justify further investigation of these complexes.
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Affiliation(s)
- Benjamin Spyrou
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Ingebjørg N Hungnes
- School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, United Kingdom
| | - Filipa Mota
- School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, United Kingdom
| | - Jayanta Bordoloi
- School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, United Kingdom
| | - Philip J Blower
- School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, United Kingdom
| | - Jonathan M White
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Michelle T Ma
- School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, United Kingdom
| | - Paul S Donnelly
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
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3
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Krasnovskaya O, Spector D, Zlobin A, Pavlov K, Gorelkin P, Erofeev A, Beloglazkina E, Majouga A. Metals in Imaging of Alzheimer's Disease. Int J Mol Sci 2020; 21:E9190. [PMID: 33276505 PMCID: PMC7730413 DOI: 10.3390/ijms21239190] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 11/25/2020] [Accepted: 11/28/2020] [Indexed: 12/23/2022] Open
Abstract
One of the hallmarks of Alzheimer's disease (AD) is the deposition of amyloid plaques in the brain parenchyma, which occurs 7-15 years before the onset of cognitive symptoms of the pathology. Timely diagnostics of amyloid formations allows identifying AD at an early stage and initiating inhibitor therapy, delaying the progression of the disease. However, clinically used radiopharmaceuticals based on 11C and 18F are synchrotron-dependent and short-lived. The design of new metal-containing radiopharmaceuticals for AD visualization is of interest. The development of coordination compounds capable of effectively crossing the blood-brain barrier (BBB) requires careful selection of a ligand moiety, a metal chelating scaffold, and a metal cation, defining the method of supposed Aβ visualization. In this review, we have summarized metal-containing drugs for positron emission tomography (PET), magnetic resonance imaging (MRI), and single-photon emission computed tomography (SPECT) imaging of Alzheimer's disease. The obtained data allow assessing the structure-ability to cross the BBB ratio.
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Affiliation(s)
- Olga Krasnovskaya
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1,3, 119991 Moscow, Russia; (A.Z.); (K.P.); (P.G.); (A.E.); (E.B.); (A.M.)
- Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology (MISIS), Leninskiy Prospect 4, 101000 Moscow, Russia
| | - Daniil Spector
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1,3, 119991 Moscow, Russia; (A.Z.); (K.P.); (P.G.); (A.E.); (E.B.); (A.M.)
- Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology (MISIS), Leninskiy Prospect 4, 101000 Moscow, Russia
| | - Alexander Zlobin
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1,3, 119991 Moscow, Russia; (A.Z.); (K.P.); (P.G.); (A.E.); (E.B.); (A.M.)
| | - Kirill Pavlov
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1,3, 119991 Moscow, Russia; (A.Z.); (K.P.); (P.G.); (A.E.); (E.B.); (A.M.)
| | - Peter Gorelkin
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1,3, 119991 Moscow, Russia; (A.Z.); (K.P.); (P.G.); (A.E.); (E.B.); (A.M.)
- Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology (MISIS), Leninskiy Prospect 4, 101000 Moscow, Russia
| | - Alexander Erofeev
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1,3, 119991 Moscow, Russia; (A.Z.); (K.P.); (P.G.); (A.E.); (E.B.); (A.M.)
- Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology (MISIS), Leninskiy Prospect 4, 101000 Moscow, Russia
| | - Elena Beloglazkina
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1,3, 119991 Moscow, Russia; (A.Z.); (K.P.); (P.G.); (A.E.); (E.B.); (A.M.)
| | - Alexander Majouga
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1,3, 119991 Moscow, Russia; (A.Z.); (K.P.); (P.G.); (A.E.); (E.B.); (A.M.)
- Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology (MISIS), Leninskiy Prospect 4, 101000 Moscow, Russia
- Mendeleev University of Chemical Technology of Russia, Miusskaya Ploshchad’ 9, 125047 Moscow, Russia
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4
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Bernhard Y, Sedlacek O, Van Guyse JFR, Bender J, Zhong Z, De Geest BG, Hoogenboom R. Poly(2-ethyl-2-oxazoline) Conjugates with Salicylic Acid via Degradable Modular Ester Linkages. Biomacromolecules 2020; 21:3207-3215. [PMID: 32639725 DOI: 10.1021/acs.biomac.0c00659] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Conjugation of drugs to polymers is a widely used approach to gain control over the release of therapeutics. In this contribution, salicylic acid, a multipurpose model drug, is conjugated to the biocompatible poly(2-ethyl-2-oxazoline) (PEtOx). The drug is attached to the side chains of a polymer carrier through a hydrolytically cleavable ester linker, via a sequential postpolymerization modification. The chemical modulation of this ester, i.e., by primary or secondary alcohols, is demonstrated to greatly influence the ester hydrolysis rate. This crucial parameter allows us to tune the in vitro kinetics of the sustained drug release for periods exceeding a month in phosphate-buffered saline (PBS). The synthetic accessibility of the cleavable linker, together with the modularity of the drug release rate offered by this approach, highlights the utility of this class of polymers in the field of long-lasting drug delivery systems for persistent and chronic disease treatment.
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Affiliation(s)
- Yann Bernhard
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, 9000 Ghent, Belgium
| | - Ondrej Sedlacek
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, 9000 Ghent, Belgium
| | - Joachim F R Van Guyse
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, 9000 Ghent, Belgium
| | - Johan Bender
- Bender Analytical Holding BV, Oude Holleweg 6, 6572 AB Berg en Dal, The Netherlands
| | - Zifu Zhong
- Department of Pharmaceutics, Ghent University, B-9000 Ghent, Belgium
| | - Bruno G De Geest
- Department of Pharmaceutics, Ghent University, B-9000 Ghent, Belgium
| | - Richard Hoogenboom
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, 9000 Ghent, Belgium
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5
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Metal complexes that bind to the amyloid-β peptide of relevance to Alzheimer’s disease. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213255
expr 886172045 + 931245952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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6
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Gomes LM, Bataglioli JC, Storr T. Metal complexes that bind to the amyloid-β peptide of relevance to Alzheimer’s disease. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213255] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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7
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Qian Z, Zhang Y, Jia AQ, Shi HT, Zhang QF. Syntheses and reactivity of oxorhenium(V) complexes containing tetraphenylimidodiphosphinato and dialkyldithiocarbamato ligands. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2019.119234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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McInnes LE, Noor A, Roselt PD, McLean CA, White JM, Donnelly PS. A Copper Complex of a Thiosemicarbazone-Pyridylhydrazone Ligand Containing a Vinylpyridine Functional Group as a Potential Imaging Agent for Amyloid-β Plaques. Aust J Chem 2019. [DOI: 10.1071/ch19311] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Complexes containing positron-emitting radionuclides of copper have the potential to be of use for diagnostic imaging with positron emission tomography. Alzheimer’s disease is characterised by the presence of amyloid-β plaques in the brain. A new thiosemicarbazone-pyridyl hydrazone tetradentate ligand with a pyridyl-4-vinylpyridine functional group was prepared with the aim of making a copper complex that binds to amyloid-β plaques to assist in the diagnosis of Alzheimer’s disease. The ligand forms a charge neutral complex with copper(ii) that was characterised by X-ray crystallography and the electrochemical behaviour of the complex was investigated by cyclic voltammetry. The new ligand can be radiolabelled with positron-emitting copper-64 at room temperature in excellent radiochemical yields. The new complex interacts with synthetic amyloid-β fibrils and binds amyloid-β plaques present in post-mortem Alzheimer’s disease brain tissue.
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9
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Rhenium and technetium complexes of thioamide derivatives of pyridylhydrazine that bind to amyloid-β plaques. J Biol Inorg Chem 2018; 23:1139-1151. [PMID: 29982869 DOI: 10.1007/s00775-018-1590-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 06/22/2018] [Indexed: 01/05/2023]
Abstract
Age-associated deposition of amyloid-β in cerebral blood vessels, a condition referred to as cerebral amyloid angiopathy, can contribute to stroke and dementia. This research aimed to design new radioactive technetium-99 m complexes that bind to amyloid-β plaques that have the potential to assist in diagnosis of cerebral amyloid angiopathy using single-photon-emitted computed tomography (SPECT) imaging. Six new pyridylthiosemicarbazide ligands containing either benzofuran or styrylpyridyl functional groups that are known to selectively bind to amyloid plaques were prepared. Non-radioactive isotopes of technetium are not available so rhenium was used as a surrogate for exploratory chemistry. The new ligands were used to prepare well-defined [Re-oxo]3+ complexes where two pyridylthiosemicarbazide ligands were coordinated to a single metal ion to give bivalent complexes with two amyloid-β targeting functional groups. The interaction of the [Re-oxo]3+ complexes with synthetic amyloid-β1-42 and with amyloid plaques in human brain tissue was investigated. Two ligands were selected to develop methods to prepare their [99mTc-oxo]3+ complexes at the tracer level. These technetium-99 m complexes are likely to be isostructural to their rhenium-oxo analogues.
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10
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Altaf AA, Hamayun M, Lal B, Tahir MN, Holder AA, Badshah A, Crans DC. Ferrocene-based anilides: synthesis, structural characterization and inhibition of butyrylcholinesterase. Dalton Trans 2018; 47:11769-11781. [DOI: 10.1039/c8dt01726c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Twenty-three compounds in two series of ferrocene-based anilides, with the general formula C5H5-Fe-C5H4-C6H4-NH-CO-C6H4-R (where R = H, F, Cl, CH3 and OCH3), have been synthesized and found to inhibit butyrylcholinesterase.
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Affiliation(s)
- Ataf Ali Altaf
- Department of Chemistry
- University of Gujrat
- Gujrat 50700
- Pakistan
| | | | - Bhajan Lal
- Department of Chemistry
- Shah Abdul Latif University
- Khairpur
- Pakistan
| | | | - Alvin A. Holder
- Department of Chemistry and Biochemistry
- Old Dominion University
- Norfolk
- USA
| | - Amin Badshah
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad-45320
- Pakistan
| | - Debbie C. Crans
- Department of Chemistry
- Colorado State University
- Fort Collins
- USA
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11
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Chen K, Cui M. Recent progress in the development of metal complexes as β-amyloid imaging probes in the brain. MEDCHEMCOMM 2017; 8:1393-1407. [PMID: 30108850 PMCID: PMC6072098 DOI: 10.1039/c7md00064b] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Accepted: 05/11/2017] [Indexed: 01/28/2023]
Abstract
In this review, we have focused on the recent progress in metal complexes that are able to bind to β-amyloid (Aβ) species. We have discussed various radioactive complexes of 99mTc, 68Ga, 64Cu, 89Zr, and 111In, which were designed as Aβ imaging agents for positron emission tomography (PET) and single photon emission computed tomography (SPECT) imaging, non-radioactive Re and Ru complexes as Aβ sensors using luminescence methods, and Gd3+ complexes as contrast agents for magnetic resonance imaging (MRI).
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Affiliation(s)
- Kaihua Chen
- Key Laboratory of Radiopharmaceuticals , Ministry of Education , College of Chemistry , Beijing Normal University , Beijing 100875 , P. R. China . ; ; Tel: +86 10 58808891
| | - Mengchao Cui
- Key Laboratory of Radiopharmaceuticals , Ministry of Education , College of Chemistry , Beijing Normal University , Beijing 100875 , P. R. China . ; ; Tel: +86 10 58808891
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12
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Tolman WB. Editorial: Inorganic Chemistry at 55. Inorg Chem 2017; 56:102-105. [DOI: 10.1021/acs.inorgchem.6b03018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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