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Ait Bachir L, Zaarour M, Cossec M, De Marcellus C, Janin C, Cussac-Pillegand C. Un cas de maladie de Basedow et d’insuffisance corticotrope secondaires au vaccin à ARN messager contre le SARS-CoV-2. Annales d'Endocrinologie 2023. [DOI: 10.1016/j.ando.2022.12.064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
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Gasse C, Zaarour M, Noppen S, Abramov M, Marlière P, Liekens S, De Strooper B, Herdewijn P. Modulation of BACE1 Activity by Chemically Modified Aptamers. Chembiochem 2018; 19:754-763. [PMID: 29327496 DOI: 10.1002/cbic.201700461] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 01/10/2018] [Indexed: 11/10/2022]
Abstract
A modified DNA aptamer that binds BACE1, a therapeutic target involved in Alzheimer's disease has been developed. This ssXNA not only tightly binds to BACE1 but also inhibits its protease activity in vitro in the same range as a previously described unmodified aptamer. We report the in vitro selection of functional oligonucleotides incorporating two nucleobase modifications: 5-chlorouracil and 7-deazaadenine. The nucleoside analogue 5-chloro-2'-deoxyuridine has already been explored as a replacement for thymidine in a chemically modified genome of a bacterium. Thus, 5-chlorouracil modification is a good candidate to support genetic transfer in vivo as well as functional activity.
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Affiliation(s)
- Cécile Gasse
- Univ Evry, CNRS-UMR8030-Laboratoire iSSB, CEA, DRF, IG, Genoscope, Université Paris-Saclay, 5 rue Henri Desbruères, Évry, 91030, France
| | - Marwa Zaarour
- Univ Evry, CNRS-UMR8030-Laboratoire iSSB, CEA, DRF, IG, Genoscope, Université Paris-Saclay, 5 rue Henri Desbruères, Évry, 91030, France
| | - Sam Noppen
- Department of Microbiology and Immunology, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, KU Leuven, Herestraat 49, Postbus 1043, 3000, Leuven, Belgium
| | - Mikhail Abramov
- Medicinal Chemistry, Rega Institute for Medical Research, KU Leuven, Herestraat 49, 3000, Leuven, Belgium
| | - Philippe Marlière
- The European Syndicate of Synthetic Scientists and Industrialists (TESSI), 81 rue Réaumur, 75002, Paris, France
| | - Sandra Liekens
- Department of Microbiology and Immunology, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, KU Leuven, Herestraat 49, Postbus 1043, 3000, Leuven, Belgium
| | - Bart De Strooper
- VIB, Center for Brain & Disease Research, Herestraat 49, 3000, Leuven, Belgium.,Department of Neurosciences, Leuven Institute for Neuroscience and Disease, KU Leuven, Herestraat 49, 3000, Leuven, Belgium.,Dementia Research Institute (UK), University College London, Gower Street, WC1E 6BT, London, UK
| | - Piet Herdewijn
- Univ Evry, CNRS-UMR8030-Laboratoire iSSB, CEA, DRF, IG, Genoscope, Université Paris-Saclay, 5 rue Henri Desbruères, Évry, 91030, France.,Medicinal Chemistry, Rega Institute for Medical Research, KU Leuven, Herestraat 49, 3000, Leuven, Belgium
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Palatinus L, Brázda P, Boullay P, Perez O, Klementová M, Petit S, Eigner V, Zaarour M, Mintova S. Hydrogen positions in single nanocrystals revealed by electron diffraction. Science 2017; 355:166-169. [PMID: 28082587 DOI: 10.1126/science.aak9652] [Citation(s) in RCA: 139] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 11/22/2016] [Indexed: 01/18/2023]
Abstract
The localization of hydrogen atoms is an essential part of crystal structure analysis, but it is difficult because of their small scattering power. We report the direct localization of hydrogen atoms in nanocrystalline materials, achieved using the recently developed approach of dynamical refinement of precession electron diffraction tomography data. We used this method to locate hydrogen atoms in both an organic (paracetamol) and an inorganic (framework cobalt aluminophosphate) material. The results demonstrate that the technique can reliably reveal fine structural details, including the positions of hydrogen atoms in single crystals with micro- to nanosized dimensions.
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Affiliation(s)
- L Palatinus
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague, Czech Republic.
| | - P Brázda
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague, Czech Republic
| | - P Boullay
- CRISMAT (Laboratoire de Cristallographie et Sciences des Matériaux), Normandie Université, ENSICAEN (Ecole Nationale Supérieure d'Ingénieurs de Caen), UNICAEN (Université de Caen), CNRS UMR 6508, 6 Bd Maréchal Juin, F-14050 Caen, France.
| | - O Perez
- CRISMAT (Laboratoire de Cristallographie et Sciences des Matériaux), Normandie Université, ENSICAEN (Ecole Nationale Supérieure d'Ingénieurs de Caen), UNICAEN (Université de Caen), CNRS UMR 6508, 6 Bd Maréchal Juin, F-14050 Caen, France
| | - M Klementová
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague, Czech Republic
| | - S Petit
- CRISMAT (Laboratoire de Cristallographie et Sciences des Matériaux), Normandie Université, ENSICAEN (Ecole Nationale Supérieure d'Ingénieurs de Caen), UNICAEN (Université de Caen), CNRS UMR 6508, 6 Bd Maréchal Juin, F-14050 Caen, France
| | - V Eigner
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague, Czech Republic
| | - M Zaarour
- LCS (Laboratoire Catalyse et Spectrochimie), Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6506, 6 Bd Maréchal Juin, F-14050 Caen, France
| | - S Mintova
- LCS (Laboratoire Catalyse et Spectrochimie), Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6506, 6 Bd Maréchal Juin, F-14050 Caen, France
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Dong B, Belkhair S, Zaarour M, Fisher L, Verran J, Tosheva L, Retoux R, Gilson JP, Mintova S. Silver confined within zeolite EMT nanoparticles: preparation and antibacterial properties. Nanoscale 2014; 6:10859-10864. [PMID: 25117582 DOI: 10.1039/c4nr03169e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The preparation of pure zeolite nanocrystals (EMT-type framework) and their silver ion-exchanged (Ag(+)-EMT) and reduced silver (Ag(0)-EMT) forms is reported. The template-free zeolite nanocrystals are stabilized in water suspensions and used directly for silver ion-exchange and subsequent chemical reduction under microwave irradiation. The high porosity, low Si/Al ratio, high concentration of sodium and ultrasmall crystal size of the EMT-type zeolite permitted the introduction of a high amount of silver using short ion-exchange times in the range of 2-6 h. The killing efficacy of pure EMT, Ag(+)-EMT and Ag(0)-EMT against Escherichia coli was studied semi-quantitatively. The antibacterial activity increased with increasing Ag content for both types of samples (Ag(+)-EMT and Ag(0)-EMT). The Ag(0)-EMT samples show slightly enhanced antimicrobial efficacy compared to that of Ag(+)-EMT, however, the differences are not substantial and the preparation of Ag nanoparticles is not viable considering the complexity of preparation steps.
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Affiliation(s)
- B Dong
- Laboratoire Catalyse & Spectrochimie, University of Caen, CNRS, 6, boulevard du Maréchal Juin, 14050 Caen Cedex, France.
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