1
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Ikbal SA, Sakata Y, Akine S. A chiral spirobifluorene-based bis(salen) zinc(ii) receptor towards highly enantioselective binding of chiral carboxylates. Dalton Trans 2021; 50:4119-4123. [PMID: 33662079 DOI: 10.1039/d1dt00218j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We have designed a new chiral receptor based on two salen zinc(ii) complex units connected with a spirobifluorene framework. The chiral receptor is proven to enantioselectively bind chiral carboxylate guests and the differences between the binding constants of enantiomeric guests were up to more than one order of magnitude.
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Affiliation(s)
- Sk Asif Ikbal
- Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
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2
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Unruh C, Van Bavel N, Anikovskiy M, Prenner EJ. Benefits and Detriments of Gadolinium from Medical Advances to Health and Ecological Risks. Molecules 2020; 25:molecules25235762. [PMID: 33297578 PMCID: PMC7730697 DOI: 10.3390/molecules25235762] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/30/2020] [Accepted: 12/04/2020] [Indexed: 12/17/2022] Open
Abstract
Gadolinium (Gd)-containing chelates have been established as diagnostics tools. However, extensive use in magnetic resonance imaging has led to increased Gd levels in industrialized parts of the world, adding to natural occurrence and causing environmental and health concerns. A vast amount of data shows that metal may accumulate in the human body and its deposition has been detected in organs such as brain and liver. Moreover, the disease nephrogenic systemic fibrosis has been linked to increased Gd3+ levels. Investigation of Gd3+ effects at the cellular and molecular levels mostly revolves around calcium-dependent proteins, since Gd3+ competes with calcium due to their similar size; other reports focus on interaction of Gd3+ with nucleic acids and carbohydrates. However, little is known about Gd3+ effects on membranes; yet some results suggest that Gd3+ interacts strongly with biologically-relevant lipids (e.g., brain membrane constituents) and causes serious structural changes including enhanced membrane rigidity and propensity for lipid fusion and aggregation at much lower concentrations than other ions, both toxic and essential. This review surveys the impact of the anthropogenic use of Gd emphasizing health risks and discussing debilitating effects of Gd3+ on cell membrane organization that may lead to deleterious health consequences.
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Affiliation(s)
- Colin Unruh
- Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada; (C.U.); (N.V.B.)
| | - Nicolas Van Bavel
- Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada; (C.U.); (N.V.B.)
| | - Max Anikovskiy
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
- Correspondence: (M.A.); (E.J.P.)
| | - Elmar J. Prenner
- Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada; (C.U.); (N.V.B.)
- Correspondence: (M.A.); (E.J.P.)
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3
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Whited J, Rama CK, Sun XL. Synthesis and Evaluation of Protein-Phenylboronic Acid Conjugates as Lectin Mimetics. ACS OMEGA 2018; 3:13467-13473. [PMID: 30411039 PMCID: PMC6217639 DOI: 10.1021/acsomega.8b00840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 07/05/2018] [Indexed: 06/08/2023]
Abstract
Glycan-binding molecules, such as lectins, are very important tools for characterizing, imaging, or targeting glycans and are often involved in either physiological or pathological processes. However, their availability is far less compared to the diversity of native glycans. Therefore, development of lectin mimetics with desired specificity and affinity is in high demand. Boronic acid reacts with 1,2- and 1,3-diols of saccharides in aqueous media through reversible boronate ester formation and are regarded as synthetic lectin mimetics. In this study, bovine serum albumin (BSA)-phenylboronic acid (PBA) conjugates were synthesized in a density-controlled manner by targeting both aspartic and glutamic acids to afford lectin mimetics with multivalent PBA, as multivalency is a key factor for glycan recognition in both specificity and affinity. The resultant BSA-PBA conjugates were characterized by sodium dodecyl sulfate polyacrylamide gel electrophoresis and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis. Their macrophage cell surface glycan-binding capacity was characterized by a competitive lectin-binding assay examined by flow cytometry, and 3-(4,5-di-methylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay showed biocompatibility. These novel lectin mimetics will find a broad range of applications as they can be wittingly modified, altering binding specificity and capacity.
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4
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Gündüz S, Vibhute S, Botár R, Kálmán FK, Tóth I, Tircsó G, Regueiro-Figueroa M, Esteban-Gómez D, Platas-Iglesias C, Angelovski G. Coordination Properties of GdDO3A-Based Model Compounds of Bioresponsive MRI Contrast Agents. Inorg Chem 2018; 57:5973-5986. [PMID: 29718660 DOI: 10.1021/acs.inorgchem.8b00473] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We report a detailed characterization of the thermodynamic stability and dissociation kinetics of Gd3+ complexes with DO3A derivatives containing a (methylethylcarbamoylmethylamino)acetic acid (L1), (methylpropylcarbamoylmethylamino)acetic acid (L2), 2-dimethylamino- N-ethylacetamide (L3), or 2-dimethylamino- N-propylacetamide (L4) group attached to the fourth nitrogen atom of the macrocyclic unit. These ligands are model systems of Ca2+- and Zn2+-responsive contrast agents (CA) for application in magnetic resonance imaging (MRI). The results of the potentiometric studies ( I = 0.15 M NaCl) provide stability constants with log KGdL values in the range 13.9-14.8. The complex speciation in solution was found to be quite complicated due to the formation of protonated species at low pH, hydroxido complexes at high pH, and stable dinuclear complexes in the case of L1,2. At neutral pH significant fractions of the complexes are protonated at the amine group of the amide side chain (log KGdL×H = 7.2-8.1). These ligands form rather weak complexes with Mg2+ and Ca2+ but very stable complexes with Cu2+ (log KCuL = 20.4-22.3) and Zn2+ (log KZnL = 15.5-17.6). Structural studies using a combination of 1H NMR and luminescence spectroscopy show that the amide group of the ligand is coordinated to the metal ion at pH ∼8.5, while protonation of the amine group provokes the decoordination of the amide O atom and a concomitant increase in the hydration number and proton relaxivity. The dissociation of the complexes occurs mainly through a rather efficient proton-assisted pathway, which results in kinetic inertness comparable to that of nonmacrocyclic ligands such as DTPA rather than DOTA-like complexes.
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Affiliation(s)
- Serhat Gündüz
- MR Neuroimaging Agents , Max Planck Institute for Biological Cybernetics , D-72076 Tuebingen , Germany
| | - Sandip Vibhute
- MR Neuroimaging Agents , Max Planck Institute for Biological Cybernetics , D-72076 Tuebingen , Germany
| | - Richard Botár
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Ferenc K Kálmán
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Imre Tóth
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Gyula Tircsó
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Martín Regueiro-Figueroa
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química , Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10 , 15008 A Coruña , Spain
| | - David Esteban-Gómez
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química , Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10 , 15008 A Coruña , Spain
| | - Carlos Platas-Iglesias
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química , Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10 , 15008 A Coruña , Spain
| | - Goran Angelovski
- MR Neuroimaging Agents , Max Planck Institute for Biological Cybernetics , D-72076 Tuebingen , Germany
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5
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Carreira-Barral I, Fernández-Pérez I, Mato-Iglesias M, de Blas A, Platas-Iglesias C, Esteban-Gómez D. Recognition of AMP, ADP and ATP through Cooperative Binding by Cu(II) and Zn(II) Complexes Containing Urea and/or Phenylboronic-Acid Moieties. Molecules 2018; 23:molecules23020479. [PMID: 29470445 PMCID: PMC6017333 DOI: 10.3390/molecules23020479] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 02/16/2018] [Accepted: 02/20/2018] [Indexed: 12/16/2022] Open
Abstract
We report a series of Cu(II) and Zn(II) complexes with different ligands containing a dipicolyl unit functionalized with urea groups that may contain or not a phenylboronic acid function. These complexes were designed for the recognition of phosphorylated anions through coordination to the metal ion reinforced by hydrogen bonds involving the anion and NH groups of urea. The complexes were isolated and several adducts with pyrophosphate were characterized using X-ray diffraction measurements. Coordination of one of the urea nitrogen atoms to the metal ion promoted the hydrolysis of the ligands containing 1,3-diphenylurea units, while ligands bearing 1-ethyl-3-phenylurea groups did not hydrolyze significantly at room temperature. Spectrophotometric titrations, combined with 1H and 31P NMR studies, were used in investigating the binding of phosphate, pyrophosphate (PPi), and nucleoside 5′-polyphosphates (AMP, ADP, ATP, CMP, and UMP). The association constants determined in aqueous solution (pH 7.0, 0.1 M MOPS) point to a stronger association with PPi, ADP, and ATP as compared with the anions containing a single phosphate unit. The [CuL4]2+ complex shows important selectivity for pyrophosphate (PPi) over ADP and ATP.
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Affiliation(s)
- Israel Carreira-Barral
- Departamento de Química, Facultade de Ciencias, Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA), 15071 A Coruña, Galicia, Spain.
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, 09001 Burgos, Spain.
| | - Isabel Fernández-Pérez
- Departamento de Química, Facultade de Ciencias, Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA), 15071 A Coruña, Galicia, Spain.
| | - Marta Mato-Iglesias
- Departamento de Química, Facultade de Ciencias, Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA), 15071 A Coruña, Galicia, Spain.
| | - Andrés de Blas
- Departamento de Química, Facultade de Ciencias, Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA), 15071 A Coruña, Galicia, Spain.
| | - Carlos Platas-Iglesias
- Departamento de Química, Facultade de Ciencias, Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA), 15071 A Coruña, Galicia, Spain.
| | - David Esteban-Gómez
- Departamento de Química, Facultade de Ciencias, Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA), 15071 A Coruña, Galicia, Spain.
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6
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Nielsen LG, Junker AKR, Sørensen TJ. Composed in the f-block: solution structure and function of kinetically inert lanthanide(iii) complexes. Dalton Trans 2018; 47:10360-10376. [DOI: 10.1039/c8dt01501e] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
An induction to the wonders of lanthanides, and a call for standardised methods for characterisation of lanthanide complexes in solution.
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Affiliation(s)
- Lea Gundorff Nielsen
- Nano-Science Center & Department of Chemistry
- University of Copenhagen
- 2100 København Ø
- Denmark
| | - Anne Kathrine R. Junker
- Nano-Science Center & Department of Chemistry
- University of Copenhagen
- 2100 København Ø
- Denmark
| | - Thomas Just Sørensen
- Nano-Science Center & Department of Chemistry
- University of Copenhagen
- 2100 København Ø
- Denmark
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7
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Wu T, Bouř P. Specific circularly polarized luminescence of Eu(iii), Sm(iii), and Er(iii) induced by N-acetylneuraminic acid. Chem Commun (Camb) 2018; 54:1790-1792. [DOI: 10.1039/c7cc09463a] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sialic acid chelated with the Eu, Sm and Er ions provides distinct circularly polarized luminescence (CPL) patterns that can be used for its detection. The CPL spectra were measured using the Raman optical activity (ROA) technique.
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Affiliation(s)
- Tao Wu
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences
- 16610 Prague 6
- Czech Republic
| | - Petr Bouř
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences
- 16610 Prague 6
- Czech Republic
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8
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Matsumoto A, Stephenson-Brown AJ, Khan T, Miyazawa T, Cabral H, Kataoka K, Miyahara Y. Heterocyclic boronic acids display sialic acid selective binding in a hypoxic tumor relevant acidic environment. Chem Sci 2017; 8:6165-6170. [PMID: 28989647 PMCID: PMC5627601 DOI: 10.1039/c7sc01905j] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 06/19/2017] [Indexed: 01/02/2023] Open
Abstract
A group of heterocyclic boronic acids demonstrating unusually high affinity and selectivity for sialic acids are described, with strong interactions under the weakly acidic pH conditions associated with a hypoxic tumoral microenvironment.
Boronic acids are well known for their ability to reversibly interact with the diol groups found in sugars and glycoproteins. However, they are generally indiscriminate in their binding. Herein we describe the discovery of a group of heterocyclic boronic acids demonstrating unusually high affinity and selectivity for sialic acids (SAs or N-acetylneuraminic acid), which are sugar residues that are intimately linked with tumor growth and cancer progression. Remarkably, these interactions strengthen under the weakly acidic pH conditions associated with a hypoxic tumoral microenvironment. In vitro competitive binding assays uncovered a significantly higher ability of 5-boronopicolinic acid, one of the derivatives identified in this work as a strong SA-binder, to interact with cell surface SA in comparison to a gold-standard structure, 3-propionamidophenylboronic acid, which has proven to be an efficient SA-binder in numerous reports. This structure also proved to be suitable for further chemical conjugation with a well-preserved SA-binding capability. These findings suggest an attractive alternative to other ongoing boronic acid based chemistry techniques aiming to achieve tumor-specific chemotherapies and diagnoses.
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Affiliation(s)
- A Matsumoto
- Institute of Biomaterials and Bioengineering , Tokyo Medical and Dental University , 2-3-10 Kanda-Surugadai, Chiyoda-ku , Tokyo 101-0062 , Japan .
| | - A J Stephenson-Brown
- School of Chemical Engineering , University of Birmingham , Edgbaston , Birmingham , B15 2TT , UK
| | - T Khan
- Department of Bioengineering , Graduate School of Engineering , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan
| | - T Miyazawa
- Institute of Biomaterials and Bioengineering , Tokyo Medical and Dental University , 2-3-10 Kanda-Surugadai, Chiyoda-ku , Tokyo 101-0062 , Japan .
| | - H Cabral
- Department of Bioengineering , Graduate School of Engineering , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan
| | - K Kataoka
- School of Chemical Engineering , University of Birmingham , Edgbaston , Birmingham , B15 2TT , UK.,Department of Materials Engineering , Graduate School of Engineering , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan
| | - Y Miyahara
- Institute of Biomaterials and Bioengineering , Tokyo Medical and Dental University , 2-3-10 Kanda-Surugadai, Chiyoda-ku , Tokyo 101-0062 , Japan .
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9
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Liu HW, Law WHT, Lee LCC, Lau JCW, Lo KKW. Cyclometalated Iridium(III) Bipyridine-Phenylboronic Acid Complexes as Bioimaging Reagents and Luminescent Probes for Sialic Acids. Chem Asian J 2017; 12:1545-1556. [DOI: 10.1002/asia.201700359] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 04/13/2017] [Indexed: 12/31/2022]
Affiliation(s)
- Hua-Wei Liu
- Department of Biology and Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong P.R. China
| | - Wendell Ho-Tin Law
- Department of Biology and Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong P.R. China
| | - Lawrence Cho-Cheung Lee
- Department of Biology and Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong P.R. China
| | - Jonathan Chun-Wai Lau
- Department of Biology and Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong P.R. China
| | - Kenneth Kam-Wing Lo
- Department of Biology and Chemistry; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong P.R. China
- State Key Laboratory of Millimeter Waves; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong P.R. China
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10
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Neil ER, Parker D. Selective signalling of sialic acid in solution by circularly polarised luminescence spectroscopy using a dynamically racemic europium(iii) complex. RSC Adv 2017. [DOI: 10.1039/c6ra26662b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Reversible binding of sialic acid to a phenylboronate derivative of a chiral europium(iii) complex is signalled by a strong induced CPL signature.
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Affiliation(s)
| | - David Parker
- Department of Chemistry
- Durham University
- Durham
- UK
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11
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Modulating luminescence of Tb(3+) with biomolecules for sensing heparin and its contaminant OSCS. Biosens Bioelectron 2016; 86:858-863. [PMID: 27494809 DOI: 10.1016/j.bios.2016.07.085] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 07/23/2016] [Accepted: 07/25/2016] [Indexed: 01/09/2023]
Abstract
The detection of heparin (Hep) and its contaminant oversulfated chondroitin sulfate (OSCS) is of great importance in clinics but remains challenging. Here, we report a sensitive and selective time-resolved luminescence (TRL) biosensing system for Hep by modulating the photoluminescence of Tb(3+) with guanine-rich ssDNA and Hep-specific AG73 peptide (RKRLQVQLSIRT). With the developed system, Hep including both unfractionated Hep (UFH) and the low molecular weight Hep (LMWH) has been successfully detected with a satisfactory detection limit. Owing to the highly specific interaction between Hep and AG73 peptide, major interfering substances in Hep detection, such as Hep analogs of chondrotin sulfate (Chs) and hyaluronic acid (HA), did not interfere with Hep detection. The established TRL sensing system was then successfully used for monitoring Hep metabolism in living rats by microdialysis. Moreover, the proposed TRL sensing system was further applied to analyze OSCS contaminant in Hep with heparinases treatment by exploring the inhibition effects of OSCS on the activity of heparinases. As low as 0.002% of OSCS in Hep was identified.
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12
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Cakić N, Verbić TŽ, Jelić RM, Platas-Iglesias C, Angelovski G. Synthesis and characterisation of bismacrocyclic DO3A-amide derivatives – an approach towards metal-responsive PARACEST agents. Dalton Trans 2016; 45:6555-65. [DOI: 10.1039/c5dt04625d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Three bismacrocyclic amide derivatives bearing two types of chelating moieties were prepared. The properties of their lanthanide complexes in the absence and presence of calcium, magnesium or zinc ions were studied.
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Affiliation(s)
- Nevenka Cakić
- MR Neuroimaging Agents
- Max Planck Institute for Biological Cybernetics
- 72076 Tübingen
- Germany
| | - Tatjana Ž. Verbić
- Department of Analytical Chemistry
- Faculty of Chemistry
- University of Belgrade
- 11000 Belgrade
- Serbia
| | - Ratomir M. Jelić
- Faculty of Medicinal Science
- University of Kragujevac
- 34000 Kragujevac
- Serbia
| | - Carlos Platas-Iglesias
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental
- Universidade da Coruña
- 15008 A Coruña
- Spain
| | - Goran Angelovski
- MR Neuroimaging Agents
- Max Planck Institute for Biological Cybernetics
- 72076 Tübingen
- Germany
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13
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Goto D, Ouchi K, Shibukawa M, Saito S. Affinity Capillary Electrophoresis for Selective Control of Electrophoretic Mobility of Sialic Acid Using Lanthanide-Hexadentate Macrocyclic Polyazacarboxylate Complexes. ANAL SCI 2015; 31:1143-9. [PMID: 26561258 DOI: 10.2116/analsci.31.1143] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
It is difficult to control the electrophoretic mobility in order to obtain high resolution among saccharides in complex samples. We report herein on a new affinity capillary electrophoresis (ACE) method for an anionic monosaccharide, N-acetylneuraminic acid (Neu5Ac), which is important in terms of pathological diagnosis, using lanthanide-hexadentate macrocyclic polyazacarboxylate complexes (Ln-NOTA) as affinity reagents. It was shown that Ln-NOTA complexes increased the anionic mobility of Neu5Ac by approximately 40% through selective complexation with Neu5Ac. The extent of change in the mobility strongly depended on the type of central metal ion of Ln-NOTA. The stability constant (K) of Lu-NOTA with Neu5Ac was determined by ACE to be log Kb = 3.62 ± 0.04, which is the highest value among artificial receptors for Neu5Ac reported so far. Using this ACE, the Neu5Ac content in a glycoprotein sample, α1-acid glycoprotein (AGP), was determined after acid hydrolysis. Complete separation between Neu5Ac and hydrolysis products was successful by controlling the mobility to determine the concentration of Neu5Ac.
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Affiliation(s)
- Daiki Goto
- Graduate School of Science and Engineering, Saitama University
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14
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Regueiro-Figueroa M, Gündüz S, Patinec V, Logothetis NK, Esteban-Gómez D, Tripier R, Angelovski G, Platas-Iglesias C. Gd(3+)-Based Magnetic Resonance Imaging Contrast Agent Responsive to Zn(2+). Inorg Chem 2015; 54:10342-50. [PMID: 26468992 DOI: 10.1021/acs.inorgchem.5b01719] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We report the heteroditopic ligand H5L, which contains a DO3A unit for Gd(3+) complexation connected to an NO2A moiety through a N-propylacetamide linker. The synthesis of the ligand followed a convergent route that involved the preparation of 1,4-bis(tert-butoxycarbonylmethyl)-1,4,7-triazacyclononane following the orthoamide strategy. The luminescence lifetimes of the Tb((5)D4) excited state measured for the TbL complex point to the absence of coordinated water molecules. Density functional theory calculations and (1)H NMR studies indicate that the EuL complex presents a square antiprismatic coordination in aqueous solution, where eight coordination is provided by the seven donor atoms of the DO3A unit and the amide oxygen atom of the N-propylacetamide linker. Addition of Zn(2+) to aqueous solutions of the TbL complex provokes a decrease of the emission intensity as the emission lifetime becomes shorter, which is a consequence of the coordination of a water molecule to the Tb(3+) ion upon Zn(2+) binding to the NO2A moiety. The relaxivity of the GdL complex recorded at 7 T (25 °C) increases by almost 150% in the presence of 1 equiv of Zn(2+), while Ca(2+) and Mg(2+) induced very small relaxivity changes. In vitro magnetic resonance imaging experiments confirmed the ability of GdL to provide response to the presence of Zn(2+).
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Affiliation(s)
- Martín Regueiro-Figueroa
- Grupo QUICOOR, Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Serhat Gündüz
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics , Spemannstr. 41, 72076 Tübingen, Germany
| | - Véronique Patinec
- UFR des Sciences et Techniques, Université de Bretagne Occidentale, UMR-CNRS 6521 , 6 avenue Victor le Gorgeu, C.S. 93837, 29238 BREST Cedex 3, France
| | - Nikos K Logothetis
- Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics , Tübingen, Germany.,Department of Imaging Science and Biomedical Engineering, University of Manchester , Manchester, U.K
| | - David Esteban-Gómez
- Grupo QUICOOR, Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Raphaël Tripier
- UFR des Sciences et Techniques, Université de Bretagne Occidentale, UMR-CNRS 6521 , 6 avenue Victor le Gorgeu, C.S. 93837, 29238 BREST Cedex 3, France
| | - Goran Angelovski
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics , Spemannstr. 41, 72076 Tübingen, Germany
| | - Carlos Platas-Iglesias
- Grupo QUICOOR, Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
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15
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Oukhatar F, Meudal H, Landon C, Logothetis NK, Platas-Iglesias C, Angelovski G, Tóth É. Macrocyclic Gd3+Complexes with Pendant Crown Ethers Designed for Binding Zwitterionic Neurotransmitters. Chemistry 2015; 21:11226-37. [DOI: 10.1002/chem.201500542] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Indexed: 12/23/2022]
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16
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Fan X, Freslon S, Daiguebonne C, Pollès LL, Calvez G, Bernot K, Yi X, Huang G, Guillou O. A Family of Lanthanide-Based Coordination Polymers with Boronic Acid as Ligand. Inorg Chem 2015; 54:5534-46. [DOI: 10.1021/acs.inorgchem.5b00635] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiao Fan
- INSA, UMR 6226 and ‡ENSCR, UMR 6226, Institut des Sciences Chimiques de Rennes, F-35708 Rennes, France
| | - Stéphane Freslon
- INSA, UMR 6226 and ‡ENSCR, UMR 6226, Institut des Sciences Chimiques de Rennes, F-35708 Rennes, France
| | - Carole Daiguebonne
- INSA, UMR 6226 and ‡ENSCR, UMR 6226, Institut des Sciences Chimiques de Rennes, F-35708 Rennes, France
| | - Laurent Le Pollès
- INSA, UMR 6226 and ‡ENSCR, UMR 6226, Institut des Sciences Chimiques de Rennes, F-35708 Rennes, France
| | - Guillaume Calvez
- INSA, UMR 6226 and ‡ENSCR, UMR 6226, Institut des Sciences Chimiques de Rennes, F-35708 Rennes, France
| | - Kevin Bernot
- INSA, UMR 6226 and ‡ENSCR, UMR 6226, Institut des Sciences Chimiques de Rennes, F-35708 Rennes, France
| | - Xiaohui Yi
- INSA, UMR 6226 and ‡ENSCR, UMR 6226, Institut des Sciences Chimiques de Rennes, F-35708 Rennes, France
| | - Gang Huang
- INSA, UMR 6226 and ‡ENSCR, UMR 6226, Institut des Sciences Chimiques de Rennes, F-35708 Rennes, France
| | - Olivier Guillou
- INSA, UMR 6226 and ‡ENSCR, UMR 6226, Institut des Sciences Chimiques de Rennes, F-35708 Rennes, France
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17
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Chaudhary PM, Murthy RV, Yadav R, Kikkeri R. A rationally designed peptidomimetic biosensor for sialic acid on cell surfaces. Chem Commun (Camb) 2015; 51:8112-5. [PMID: 25868668 DOI: 10.1039/c5cc01662b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have developed peptidomimetic sialic acid (Sia) biosensors using boronic acid and arginine groups on the peptide backbone. The designed peptides were conjugated to fluorescent streptavidin via biotin enabling the optical labeling of cells. This approach provides unique opportunities to detect Sia composition on the cell surfaces and filopodia.
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Affiliation(s)
- Preeti Madhukar Chaudhary
- Indian Institute of Science Education and Research, Dr. Homi Bhabbha Road, Pashan, Pune 411008, India.
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18
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Peters JA. Interactions between boric acid derivatives and saccharides in aqueous media: Structures and stabilities of resulting esters. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.01.016] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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19
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Kadjane P, Platas-Iglesias C, Boehm-Sturm P, Truffault V, Hagberg GE, Hoehn M, Logothetis NK, Angelovski G. Dual-frequency calcium-responsive MRI agents. Chemistry 2014; 20:7351-62. [PMID: 24796323 DOI: 10.1002/chem.201400159] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Indexed: 01/10/2023]
Abstract
Responsive or smart magnetic resonance imaging (MRI) contrast agents are molecular sensors that alter the MRI signal upon changes in a particular parameter in their microenvironment. Consequently, they could be exploited for visualization of various biochemical events that take place at molecular and cellular levels. In this study, a set of dual-frequency calcium-responsive MRI agents are reported. These are paramagnetic, fluorine-containing complexes that produce remarkably high MRI signal changes at the (1)H and (19)F frequencies at varying Ca(2+) concentrations. The nature of the processes triggered by Ca(2+) was revealed, allowing a better understanding of these complex systems and their further improvement. The findings indicate that these double-frequency tracers hold great promise for development of novel functional MRI methods.
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Affiliation(s)
- Pascal Kadjane
- Department for Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, 72076 Tübingen (Germany)
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20
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Roger M, Regueiro-Figueroa M, Ben Azzeddine C, Patinec V, Bonnet CS, Platas-Iglesias C, Tripier R. Lanthanide Complexes with Heteroditopic Ligands as Fluorescent Zinc Sensors. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301426] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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21
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Liu K, Liu T, Chen X, Sun X, Fang Y. Fluorescent films based on molecular-gel networks and their sensing performances. ACS APPLIED MATERIALS & INTERFACES 2013; 5:9830-9836. [PMID: 24028543 DOI: 10.1021/am4030774] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A pyrene-capped terthiophene of cholesteryl derivative (CholG-3T-Py) was designed, synthesized, and utilized for the fabrication of a fluorescent film. Unlike the commonly adopted direct-coating method, the film was fabricated by the physical immobilization of the fluorophore, CholG-3T-Py, onto a glass plate surface via preformed low-molecular-mass gelator (LMMGs)-based molecular-gel networks. The photophysical behavior of the film as prepared and its sensing performances to nitrobenzene (NB) were conducted after activation with toluene. It was found that the film as prepared and activated is sensitive to the presence of NB, and the sensing process is fully reversible. Furthermore, the effects of commonly found interferents, including structural analogues, raw materials, which are commonly used for the production of NB, and other nitroaromatics (NACs), on the sensing process were also tested. It was shown that only aniline and phenol possess slight interference. The present work not only extends the applications of LMMGs-based molecular gels but also provids a new approach for preparation of micro- and nano-structure-based fluorescent sensing films.
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Affiliation(s)
- Ke Liu
- Key Laboratory of Applied Surface and Colloid Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710062, P. R. China
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22
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Ouchi K, Saito S, Shibukawa M. New Molecular Motif for Recognizing Sialic Acid Using Emissive Lanthanide–Macrocyclic Polyazacarboxylate Complexes: Deprotonation of a Coordinated Water Molecule Controls Specific Binding. Inorg Chem 2013; 52:6239-41. [DOI: 10.1021/ic400725a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Kazuki Ouchi
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama,
Japan
| | - Shingo Saito
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama,
Japan
| | - Masami Shibukawa
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama,
Japan
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23
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Geninatti Crich S, Alberti D, Szabo I, Aime S, Djanashvili K. MRI Visualization of Melanoma Cells by Targeting Overexpressed Sialic Acid with a GdIII-dota-en-pba Imaging Reporter. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207131] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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24
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Geninatti Crich S, Alberti D, Szabo I, Aime S, Djanashvili K. MRI visualization of melanoma cells by targeting overexpressed sialic acid with a Gd(III)-dota-en-pba imaging reporter. Angew Chem Int Ed Engl 2012; 52:1161-4. [PMID: 23225599 DOI: 10.1002/anie.201207131] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 09/26/2012] [Indexed: 01/02/2023]
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25
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Regueiro-Figueroa M, Bensenane B, Ruscsák E, Esteban-Gómez D, Charbonnière LJ, Tircsó G, Tóth I, de Blas A, Rodríguez-Blas T, Platas-Iglesias C. Lanthanide dota-like complexes containing a picolinate pendant: structural entry for the design of Ln(III)-based luminescent probes. Inorg Chem 2011; 50:4125-41. [PMID: 21456610 DOI: 10.1021/ic2001915] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In this contribution we present two ligands based on a do3a platform containing a picolinate group attached to the fourth nitrogen atom of the cyclen unit, which are designed for stable lanthanide complexation in aqueous solutions. Potentiometric measurements reveal that the thermodynamic stability of the complexes is very high (log K = 21.2-23.5), being comparable to that of the dota analogues. Luminescence lifetime measurements performed on solutions of the Eu(III) and Tb(III) complexes indicate that the complexes are nine coordinate with no inner-sphere water molecules. A combination of density functional theory (DFT) calculations and NMR measurements shows that for the complexes of the heaviest lanthanides there is a major isomer in solution consisting of the enantiomeric pair Λ(δδδδ) and Δ(λλλλ), which provides square antiprismatic coordination (SAP) around the metal ion. Analysis of the Yb(III)-induced paramagnetic shifts unambiguously confirms that these complexes have SAP coordination in aqueous solution. For the light lanthanide ions however both the SAP and twisted-square antiprismatic (TSAP) isomers are present in solution. Inversion of the cyclen ring appears to be the rate-determining step for the Λ(δδδδ) ↔ Δ(λλλλ) enantiomerization process observed in the Lu(III) complexes. The energy barriers obtained from NMR measurements for this dynamic process are in excellent agreement with those predicted by DFT calculations. The energy barriers calculated for the arm-rotation process are considerably lower than those obtained for the ring-inversion path. Kinetic studies show that replacement of an acetate arm of dota by a picolinate pendant results in a 3-fold increase in the formation rate of the corresponding Eu(III) complexes and a significant increase of the rates of acid-catalyzed dissociation of the complexes. However, these rates are 1-2 orders of magnitude lower than those of do3a analogues, which shows that the complexes reported herein are remarkably inert with respect to metal ion dissociation.
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Affiliation(s)
- Martín Regueiro-Figueroa
- Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
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Regueiro-Figueroa M, Esteban-Gómez D, de Blas A, Rodríguez-Blas T, Platas-Iglesias C. Structure and Dynamics of Lanthanide(III) Complexes with an N-Alkylated do3a Ligand (H3do3a = 1,4,7,10-Tetraazacyclododecane-1,4,7-triacetic Acid): A Combined Experimental and DFT Study. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000334] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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