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Ural MS, Joseph JM, Wien F, Li X, Tran MA, Taverna M, Smadja C, Gref R. A comprehensive investigation of the interactions of human serum albumin with polymeric and hybrid nanoparticles. Drug Deliv Transl Res 2024:10.1007/s13346-024-01578-x. [PMID: 38578378 DOI: 10.1007/s13346-024-01578-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/07/2024] [Indexed: 04/06/2024]
Abstract
Nanoparticles (NPs) engineered as drug delivery systems continue to make breakthroughs as they offer numerous advantages over free therapeutics. However, the poor understanding of the interplay between the NPs and biomolecules, especially blood proteins, obstructs NP translation to clinics. Nano-bio interactions determine the NPs' in vivo fate, efficacy and immunotoxicity, potentially altering protein function. To fulfill the growing need to investigate nano-bio interactions, this study provides a systematic understanding of two key aspects: (i) protein corona (PC) formation and (ii) NP-induced modifications on protein's structure and stability. A methodology was developed by combining orthogonal techniques to analyze both quantitative and qualitative aspects of nano-bio interactions, using human serum albumin (HSA) as a model protein. Protein quantification via liquid chromatography-mass spectrometry, and capillary zone electrophoresis (CZE) clarified adsorbed protein quantity and stability. CZE further unveiled qualitative insights into HSA forms (native, glycated HSA and cysteinylated), while synchrotron radiation circular dichroism enabled analyzing HSA's secondary structure and thermal stability. Comparative investigations of NP cores (organic vs. hybrid), and shells (with or without polyethylene glycol (PEG)) revealed pivotal factors influencing nano-bio interactions. Polymeric NPs based on poly(lactic-co-glycolic acid) (PLGA) and hybrid NPs based on metal-organic frameworks (nanoMOFs) presented distinct HSA adsorption profiles. PLGA NPs had protein-repelling properties while inducing structural modifications on HSA. In contrast, HSA exhibited a high affinity for nanoMOFs forming a PC altering thereby the protein structure. A shielding effect was gained through PEGylation for both types of NPs, avoiding the PC formation as well as the alteration of unbound HSA structure.
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Affiliation(s)
- Merve Seray Ural
- Université Paris-Saclay, Institute of Molecular Sciences of Orsay, French National Center for Scientific Research, 91405, Orsay, France
- Université Paris-Saclay, Institut Galien Paris-Saclay, French National Center for Scientific Research, 91400, Orsay, France
| | - Joice Maria Joseph
- Université Paris-Saclay, Institute of Molecular Sciences of Orsay, French National Center for Scientific Research, 91405, Orsay, France
- Université Paris-Saclay, Institut Galien Paris-Saclay, French National Center for Scientific Research, 91400, Orsay, France
| | - Frank Wien
- , Synchrotron Soleil, 91190, Saint-Aubin, France
| | - Xue Li
- Université Paris-Saclay, Institute of Molecular Sciences of Orsay, French National Center for Scientific Research, 91405, Orsay, France
| | - My-An Tran
- Université Paris-Saclay, Institute of Molecular Sciences of Orsay, French National Center for Scientific Research, 91405, Orsay, France
| | - Myriam Taverna
- Université Paris-Saclay, Institut Galien Paris-Saclay, French National Center for Scientific Research, 91400, Orsay, France
| | - Claire Smadja
- Université Paris-Saclay, Institut Galien Paris-Saclay, French National Center for Scientific Research, 91400, Orsay, France.
| | - Ruxandra Gref
- Université Paris-Saclay, Institute of Molecular Sciences of Orsay, French National Center for Scientific Research, 91405, Orsay, France.
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Nabhan M, Meunier S, Le-Minh V, Robin B, de Bourayne M, Smadja C, Maillère B, Pallardy M, Turbica I. Infliximab aggregates produced in severe and mild elevated temperature stress conditions induce an extended specific CD4 T-cell response. Eur J Pharm Sci 2024; 192:106670. [PMID: 38070782 DOI: 10.1016/j.ejps.2023.106670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 12/22/2023]
Abstract
Aggregation has been widely described as a factor contributing to therapeutic antibody immunogenicity. Although production of high-affinity anti-drug antibodies depends on the activation of CD4 T lymphocytes, little is known about the T-cell response induced by antibody aggregates, especially for aggregates produced in mild conditions resulting from minor handling errors of vials. Large insoluble infliximab (IFX) aggregates produced in severe elevated temperature stress conditions have been previously shown to induce human monocyte-derived dendritic cell (moDC) maturation. We here showed that large IFX aggregates recruit in vitro a significantly higher number of CD4 T-cells compared to native IFX. Moreover, a larger array of T-cell epitopes encompassing the entire variable regions was evidenced compared to the native antibody. We then compared the responses of moDCs to different types of aggregates generated by submitting IFX to mild conditions of various times of incubation at an elevated temperature. Decreasing stress duration reduced aggregate size and quantity, and subsequently altered moDC activation. Of importance, IFX aggregates generated in mild conditions and not altering moDC phenotype generated an in vitro T-cell response with a higher frequency of CD4 T cells compared to native IFX. Moreover, cross-reactivity studies of aggregate-specific T cells showed that some T cells could recognize both native and aggregated IFX, while others responded only to IFX aggregates. Taken together, our results suggest that aggregation of antibodies in mild elevated temperature stress conditions is sufficient to alter moDC phenotype in a dose-dependent manner and to increase T-cell response.
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Affiliation(s)
- Myriam Nabhan
- Université Paris-Saclay, Inserm, Inflammation, Microbiome and Immunosurveillance, 91 400 Orsay, France; Université Paris-Saclay, Laboratoire d'Excellence en Recherche sur le Médicament et l'Innovation Thérapeutique (LABEX LERMIT), 91400 Orsay, France
| | - Sylvain Meunier
- Université de Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé, SIMoS, 91191 Gif-sur-Yvette, France; Université Paris-Saclay, Laboratoire d'Excellence en Recherche sur le Médicament et l'Innovation Thérapeutique (LABEX LERMIT), 91400 Orsay, France
| | - Victor Le-Minh
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 91 400 Orsay, France; Université Paris-Saclay, Laboratoire d'Excellence en Recherche sur le Médicament et l'Innovation Thérapeutique (LABEX LERMIT), 91400 Orsay, France
| | - Baptiste Robin
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 91 400 Orsay, France; Université Paris-Saclay, Laboratoire d'Excellence en Recherche sur le Médicament et l'Innovation Thérapeutique (LABEX LERMIT), 91400 Orsay, France
| | - Marie de Bourayne
- Université de Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé, SIMoS, 91191 Gif-sur-Yvette, France; Université Paris-Saclay, Laboratoire d'Excellence en Recherche sur le Médicament et l'Innovation Thérapeutique (LABEX LERMIT), 91400 Orsay, France
| | - Claire Smadja
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 91 400 Orsay, France; Université Paris-Saclay, Laboratoire d'Excellence en Recherche sur le Médicament et l'Innovation Thérapeutique (LABEX LERMIT), 91400 Orsay, France
| | - Bernard Maillère
- Université de Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé, SIMoS, 91191 Gif-sur-Yvette, France; Université Paris-Saclay, Laboratoire d'Excellence en Recherche sur le Médicament et l'Innovation Thérapeutique (LABEX LERMIT), 91400 Orsay, France
| | - Marc Pallardy
- Université Paris-Saclay, Inserm, Inflammation, Microbiome and Immunosurveillance, 91 400 Orsay, France; Université Paris-Saclay, Laboratoire d'Excellence en Recherche sur le Médicament et l'Innovation Thérapeutique (LABEX LERMIT), 91400 Orsay, France
| | - Isabelle Turbica
- Université Paris-Saclay, Inserm, Inflammation, Microbiome and Immunosurveillance, 91 400 Orsay, France; Université Paris-Saclay, Laboratoire d'Excellence en Recherche sur le Médicament et l'Innovation Thérapeutique (LABEX LERMIT), 91400 Orsay, France.
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Tardif C, Jaccoulet E, Bellec JF, Surroca Y, Talbot L, Taverna M, Smadja C. Imaged capillary isoelectric focusing associated with multivariate analysis: A powerful tool for quality control of therapeutic monoclonal antibodies. Talanta 2023; 260:124633. [PMID: 37172435 DOI: 10.1016/j.talanta.2023.124633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 04/28/2023] [Accepted: 05/02/2023] [Indexed: 05/15/2023]
Abstract
Monoclonal antibodies are increasingly used in cancer therapy. To guarantee the quality of these mAbs from compounding to patient administration, characterization methods are required (e.g. identity). In a clinical setting, these methods must be fast and straightforward. For this reason, we investigated the potential of image capillary isoelectric focusing (icIEF) combined with Principal Component Analysis (PCA) and Partial least squares-discriminant analysis (PLS-DA). icIEF profiles obtained from monoclonals antibodies (mAbs) analysis have been pre-processed and the data submitted to principal component analysis (PCA). This pre-processing method has been designed to avoid the impact of concentration and formulation. Analysis of four commercialized mAbs (Infliximab, Nivolumab, Pertuzumab, and Adalimumab) by icIEF-PCA led to the formation of four clusters corresponding to each mAb. Partial least squares-discriminant analysis (PLS-DA) applied to these data allowed us to build models to predict which monoclonal antibody is analyzed. The validation of this model was obtained from k-fold cross-validation and prediction tests. The selectivity and the specificity of the model performance parameters were assessed by the excellent classification obtained. In conclusion, we established that the combination of icIEF and chemometric approaches is a reliable approach for unambiguously identifying compounded therapeutic monoclonal antibodies (mAbs) before patient administration.
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Affiliation(s)
- Cécile Tardif
- Institut Galien Paris Saclay, Université Paris-Saclay, CNRS UMR 8612, Protein and Nanotechnology in Analytical Science (PNAS), 17 Avenue des Sciences, 91300, Orsay, France
| | | | - Jean-François Bellec
- Biotechne France, 19 Rue Louis Delourmel, 35230, Noyal-Châtillon-sur-Seiche, France
| | - Yannick Surroca
- Biotechne France, 19 Rue Louis Delourmel, 35230, Noyal-Châtillon-sur-Seiche, France
| | - Laurence Talbot
- Biotechne France, 19 Rue Louis Delourmel, 35230, Noyal-Châtillon-sur-Seiche, France
| | - Myriam Taverna
- Institut Galien Paris Saclay, Université Paris-Saclay, CNRS UMR 8612, Protein and Nanotechnology in Analytical Science (PNAS), 17 Avenue des Sciences, 91300, Orsay, France; Institut Universitaire de France, 103 Boulevard Saint Michel, 75005, Paris, France
| | - Claire Smadja
- Institut Galien Paris Saclay, Université Paris-Saclay, CNRS UMR 8612, Protein and Nanotechnology in Analytical Science (PNAS), 17 Avenue des Sciences, 91300, Orsay, France.
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Nguyen NVT, Smadja C, Taverna M, Nguyen LTH, Descroix S, Mai TD. On-line dual-stage enrichment via magneto-extraction and electrokinetic preconcentration: A new concept and instrumentation for capillary electrophoresis. Anal Chim Acta 2023; 1255:341141. [PMID: 37032056 DOI: 10.1016/j.aca.2023.341141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 03/14/2023] [Accepted: 03/23/2023] [Indexed: 03/28/2023]
Abstract
This study reports on the development of a new concept of on-line dual preconcentration stages for capillary electrophoresis (CE), in which two completely different preconcentration approaches can be realized in the same capillary. In the first stage, a dynamic magneto-extraction of target analytes on circulating magnetic beads is implemented within the capillary. In the second one, electrokinetic preconcentration of eluted analytes via large volume sample stacking is carried out to focus them into a nano band, prior to CE separation of enriched analytes. To implement the dual-stage preconcentration operation, a purpose-made instrument was designed, combining electrophoretic and microfluidic modules to allow precise control of the movement of magnetic beads and analyte's flow. The potential of this new enrichment principle and its associated instrument was demonstrated for CE separation with light-emitting-diode-induced fluorescent (LEDIF) detection of target double-stranded DNA (ds-DNA). The workflow consists of purification and preconcentration of a target DNA fragment (300 bp) on negatively charged magnetic beads, followed by in-capillary elution and fluorescent labelling of the enriched DNA. Large volume sample stacking of the DNA eluent was then triggered to further preconcentrate the labelled DNA before its analysis by CE-LEDIF. An enrichment factor of 125 was achieved for the target DNA fragment. With our new approach, dual-stage sample pretreatment and CE separation can now be performed in-capillary without any mismatch of working volumes, nor any waste of pretreated samples.
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Lefebvre O, Pinto S, Lahlil K, Peretti J, Smadja C, Randriamampita C, Lambert M, Fabbri F. Light‐tunable optical cell manipulation via photoactive azobenzene‐containing thin film bio‐substrate. Nano Select 2022. [DOI: 10.1002/nano.202200019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
| | - Sandra Pinto
- Université Paris‐Saclay CNRS C2N Palaiseau France
- Université Paris‐Cité Institut Cochin Inserm CNRS Paris France
| | - Khalid Lahlil
- Laboratoire de Physique de la Matière Condensée Ecole Polytechnique / CNRS Palaiseau France
| | - Jacques Peretti
- Laboratoire de Physique de la Matière Condensée Ecole Polytechnique / CNRS Palaiseau France
| | - Claire Smadja
- Université Paris‐Saclay CNRS Institut Galien Paris‐Saclay Châtenay‐Malabry France
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Laborie E, Bayle F, Bouville D, Smadja C, Dufour-Gergam E, Ammar M. Surface Biochemical Modification of Poly(dimethylsiloxane) for Specific Immune Cytokine Response. ACS Appl Bio Mater 2021; 4:1307-1318. [DOI: 10.1021/acsabm.0c01188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Etienne Laborie
- Center for Nanosciences and Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay, 10 Boulevard Thomas Gobert, 91120 Palaiseau, France
- Institut Galien Paris Sud, UMR 8612, Protein and Nanotechnology in Analytical Science (PNAS), CNRS, Université Paris-Sud, Université Paris-Saclay, 5 rue Jean Baptiste Clément, 92290 Châtenay-Malabry, France
| | - Fabien Bayle
- Center for Nanosciences and Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay, 10 Boulevard Thomas Gobert, 91120 Palaiseau, France
| | - David Bouville
- Center for Nanosciences and Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay, 10 Boulevard Thomas Gobert, 91120 Palaiseau, France
| | - Claire Smadja
- Institut Galien Paris Sud, UMR 8612, Protein and Nanotechnology in Analytical Science (PNAS), CNRS, Université Paris-Sud, Université Paris-Saclay, 5 rue Jean Baptiste Clément, 92290 Châtenay-Malabry, France
| | - Elisabeth Dufour-Gergam
- Center for Nanosciences and Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay, 10 Boulevard Thomas Gobert, 91120 Palaiseau, France
| | - Mehdi Ammar
- Center for Nanosciences and Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay, 10 Boulevard Thomas Gobert, 91120 Palaiseau, France
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7
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Hosselet C, Peyronnet D, Lamballais M, Smadja C, Verrey AS, Tyranowicz S, Galvez D, Joyes P, Danguy des Deserts L, Félice K, Lancelot S. [Quality guidelines for radiopharmacy: Development of a risk-assessment tool]. Ann Pharm Fr 2021; 79:572-581. [PMID: 33524336 DOI: 10.1016/j.pharma.2021.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 12/21/2020] [Accepted: 01/12/2021] [Indexed: 11/29/2022]
Abstract
OBJECTIVES The medical management of patients, which involves securing the drug circuit, is a major public health objective. As part of quality management, a number of risk assessment and risk management tools in care units are validated and available. However, medication management in radiopharmacy departments represents a complex and specific process. The aim of the "Quality guidelines for radiopharmacy" working group of the French society of radiopharmacy (SoFRa) was to develop a risk-assessment tool that is a priori adapted to radiopharmacy activity. METHODS A qualitative risk matrix was developed, based on available analysis tools and current regulations concerning radiopharmacy practice. The tool was then programmed to obtain a summary and scoring for each risk category, as well as a quantitative analysis of the risks identified in radiopharmacy. RESULTS Our tool contains 262 issues. The qualitative study integrates the risks related to the circuit of radiopharmaceuticals, but also risks related to personnel. The quantitative study makes it possible to carry out an automated analysis of the actions to carry out in priority to improve the practices. CONCLUSIONS This work led to the development of a self-assessment tool for the a priori analysis of risks that are adapted to the practice of radiopharmacy. It allows easy analysis of the entire circuit of radiopharmaceuticals from a single tool and meet the expectations of health authorities. This common and validated tool is available to the pharmaceutical community.
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Affiliation(s)
- C Hosselet
- Centre hospitalier de Beauvais, avenue Léon-Blum, 60000 Beauvais, France
| | - D Peyronnet
- Radiopharmacien, centre hospito-universitaire de Caen, avenue de la Côte-de-Nacre, 14033 Caen cedex 9, France
| | - M Lamballais
- Centre hospitalier Valenciennes, avenue Désandrouin, 59322 Valenciennes, France
| | - C Smadja
- Radiopharmacien, hôpital européen Georges-Pompidou, 20-40, rue Leblanc, 75908 Paris cedex 15, France
| | - A-S Verrey
- Institut de radiophysique, centre hospitalier universitaire Vaudois, rue du Grand-Pré 1, 1007 Lausanne, France
| | - S Tyranowicz
- Centre hospitalier de Sarreguemines, 2, rue René-François-Jolly, BP 50025, 57211 Sarreguemines cedex, France
| | - D Galvez
- Hôpital privé du Confluent, 2-4, rue Éric-Tabarly, 44202 Nantes, France
| | - P Joyes
- Centre hospitalier d'Angoulême, rond-point de Girac CS 55 015 Saint-Michel, 16959 Angouleme cedex 9, France
| | - L Danguy des Deserts
- Centre hospitalier d'Angoulême, rond-point de Girac CS 55 015 Saint-Michel, 16959 Angouleme cedex 9, France
| | - K Félice
- Centre hospitalier René-Dubos, 6, avenue de l'Île-de-France, 95303 Cergy Pontoise cedex, France
| | - S Lancelot
- MCU-PH, hospices civils de Lyon, groupement hospitalier Est, 59, boulevard Pinel, 69677 Bron cedex, France; Centre de recherche en neurosciences de Lyon (UMR 5292, U 1028), Université de Lyon, CNRS, Inserm, 59, boulevard Pinel, 69003 Lyon, France.
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Van Thanh Nguyen N, Taverna M, Smadja C, Mai TD. Recent Electrokinetic and Microfluidic Strategies for Detection of Amyloid Beta Peptide Biomarkers: Towards Molecular Diagnosis of Alzheimer's Disease. CHEM REC 2020; 21:149-161. [PMID: 33112020 DOI: 10.1002/tcr.202000103] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 10/05/2020] [Indexed: 11/06/2022]
Abstract
Among all neurodegenerative diseases, Alzheimer's Disease (AD) is the most prevalent worldwide, with a huge burden to the society and no efficient AD treatment so far. Continued efforts have been being made towards early and powerful diagnosis of AD, in the hope for a successful set of clinical trials and subsequently AD curative treatment. Towards this aim, detection and quantification of amyloid beta (Aβ) peptides in cerebrospinal fluid (CSF) and other biofluids, which are established and validated biomarkers for AD, have drawn attention of the scientific community and industry over almost two decades. In this work, an overview on our major contributions over 15 years to develop different electrokinetic and microfluidic strategies for Aβ peptides detection and quantification is reported. Accordingly, discussions and viewpoints on instrumental and methodological developments for microscale electrophoresis, microfluidic designs and immuno-enrichment / assays on magnetic beads in microchannels for tracing Aβ peptides in CSF are given in this review.
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Affiliation(s)
- Ngoc Van Thanh Nguyen
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 92296, Châtenay-Malabry, France
| | - Myriam Taverna
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 92296, Châtenay-Malabry, France.,Institut Universitaire de France
| | - Claire Smadja
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 92296, Châtenay-Malabry, France
| | - Thanh Duc Mai
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 92296, Châtenay-Malabry, France
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Nabhan M, Legrand FX, Le-Minh V, Robin B, Bechara R, Huang N, Smadja C, Pallardy M, Turbica I. The FcγRIIa–Syk Axis Controls Human Dendritic Cell Activation and T Cell Response Induced by Infliximab Aggregates. J I 2020; 205:2351-2361. [DOI: 10.4049/jimmunol.1901381] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 08/28/2020] [Indexed: 11/19/2022]
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Le-Minh V, Tran N, Makky A, Rosilio V, Taverna M, Smadja C. Capillary zone electrophoresis-native mass spectrometry for the quality control of intact therapeutic monoclonal antibodies. J Chromatogr A 2019; 1601:375-384. [DOI: 10.1016/j.chroma.2019.05.050] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 05/18/2019] [Accepted: 05/26/2019] [Indexed: 01/27/2023]
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Mai TD, Hauser PC, Descroix S, Crosnier de Lassichère C, Taverna M, Smadja C. In-capillary immuno-preconcentration with circulating bio-functionalized magnetic beads for capillary electrophoresis. Anal Chim Acta 2019; 1062:156-164. [DOI: 10.1016/j.aca.2019.02.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 01/22/2019] [Accepted: 02/11/2019] [Indexed: 11/17/2022]
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Varenne F, Hillaireau H, Bataille J, Smadja C, Barratt G, Vauthier C. Application of validated protocols to characterize size and zeta potential of dispersed materials using light scattering methods. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.09.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Coty JB, Varenne F, Benmalek A, Garsaa O, Le Potier I, Taverna M, Smadja C, Vauthier C. Characterization of nanomedicines’ surface coverage using molecular probes and capillary electrophoresis. Eur J Pharm Biopharm 2018; 130:48-58. [DOI: 10.1016/j.ejpb.2018.06.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 06/12/2018] [Accepted: 06/12/2018] [Indexed: 11/17/2022]
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Bataille J, Viodé A, Pereiro I, Lafleur JP, Varenne F, Descroix S, Becher F, Kutter JP, Roesch C, Poüs C, Taverna M, Pallandre A, Smadja C, Le Potier I. On-a-chip tryptic digestion of transthyretin: a step toward an integrated microfluidic system for the follow-up of familial transthyretin amyloidosis. Analyst 2018; 143:1077-1086. [DOI: 10.1039/c7an01737e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
TTR digestion on TE-chip: production of a fragment of interest allowing the therapeutic follow-up of the familial transthyretin amyloidosis.
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Abbood A, Smadja C, Taverna M, Herrenknecht C. Hydrophilic interaction liquid chromatography for dalargin separation from its structural analogues and side products. J Chromatogr A 2017; 1498:155-162. [DOI: 10.1016/j.chroma.2017.01.085] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Revised: 01/23/2017] [Accepted: 01/29/2017] [Indexed: 12/21/2022]
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Lefebvre O, Smadja C, Martincic E, Woytasik M, Ammar M. Integration of microcoils for on-chip immunosensors based on magnetic nanoparticles capture. Sensing and Bio-Sensing Research 2017. [DOI: 10.1016/j.sbsr.2016.10.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Zarzavadjian Le Bian A, Cesaretti M, Costi R, El Arbi N, Smadja C, Valverde A. Laparoscopic partial splenectomy with selective pedicular approach (with video). J Visc Surg 2017; 154:63-64. [DOI: 10.1016/j.jviscsurg.2016.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lefebvre O, Nkot FM, Smadja C, Martincic E, Woytasik M, Ammar M. Innovative Methods for the Integration of Immunosensors Based on Magnetic Nanoparticles in Lab-on-Chip. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.protcy.2017.04.088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Aboud N, Ferraro D, Taverna M, Descroix S, Smadja C, Thuy Tran N. Dyneon THV, a fluorinated thermoplastic as a novel material for microchip capillary electrophoresis. Analyst 2016; 141:5776-5783. [PMID: 27486596 DOI: 10.1039/c6an00821f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In this work, we have investigated Dyneon THV, a fluorinated material, as a new material to afford electrokinetic separations in microfluidic devices. To overcome protein adsorption, two poly(ethylene oxide) (PEO)-based coatings have been investigated: Pluronic F127 and PEO stearate 40. The best results were obtained with the PEO stearate 40 coating which allowed decreasing the surface contact angle from 91 ± 3 to 76°± 3. With this surface treatment, a 66% reduction of the electroosmotic mobility at pH 8.0 and a marked suppression of protein adsorption were observed compared to a native Dyneon THV microchip. Finally, a separation of fluorescently labeled proteins (bovine serum albumin and trypsin inhibitor), well-known for their strong tendency to adsorb on hydrophobic surfaces, was successfully achieved in an HEPES buffer with a PEO stearate 40 treated microchip by capillary zone electrophoresis. Furthermore, we demonstrated the possibility to perform non-aqueous capillary electrophoresis analysis of hydrophobic dyes using various solvents in untreated microchips. The overall results demonstrated not only the suitability of the Dyneon THV microchip for electrokinetic separations, but also its versatility allowing different separation modes to be implemented with the same microchip material.
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Affiliation(s)
- Nacéra Aboud
- Institut Galien Paris Sud, UMR8612, Protein and Nanotechnology in Analytical Science (PNAS), CNRS, Univ. Paris-Sud, Université Paris-Saclay, 5 rue Jean Baptiste Clément, 92290 Châtenay-Malabry, France.
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Jaccoulet E, Boccard J, Taverna M, Azevedos AS, Rudaz S, Smadja C. High-throughput identification of monoclonal antibodies after compounding by UV spectroscopy coupled to chemometrics analysis. Anal Bioanal Chem 2016; 408:5915-5924. [DOI: 10.1007/s00216-016-9708-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 05/24/2016] [Accepted: 06/09/2016] [Indexed: 01/25/2023]
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Jaccoulet E, Smadja C, Taverna M. Quality Control of Therapeutic Monoclonal Antibodies at the Hospital After Their Compounding and Before Their Administration to Patients. Methods Mol Biol 2016; 1466:179-184. [PMID: 27473490 DOI: 10.1007/978-1-4939-4014-1_14] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Monoclonal antibodies (mAbs) are widely used in cancer therapy and recently many new mAbs have gained EMA and FDA approvals for oncology indications. Here we describe a highly reproducible CZE method, relying on a cationic coating allowing separation and identification of a complex mixture of four compounded mAbs widely used in cancer therapy (cetuximab, rituximab, bevacizumab, and trastuzumab).
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Affiliation(s)
- Emmanuel Jaccoulet
- Institut Galien Paris-Sud, UMR 8612, Proteins and Nanotechnology in Analytical Science, CNRS, Univ Paris-Sud, Univ Paris-Saclay, 5 rue Jean-Baptiste Clément, 92296, Châtenay-Malabry, France
- Hôpital Européen Georges Pompidou, Paris, France
| | - Claire Smadja
- Institut Galien Paris-Sud, UMR 8612, Proteins and Nanotechnology in Analytical Science, CNRS, Univ Paris-Sud, Univ Paris-Saclay, 5 rue Jean-Baptiste Clément, 92296, Châtenay-Malabry, France.
| | - Myriam Taverna
- Institut Galien Paris-Sud, UMR 8612, Proteins and Nanotechnology in Analytical Science (PNAS), CNRS, Univ. Paris-Sud, Université Paris-Saclay, Châtenay-Malabry, France
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Jaccoulet E, Smadja C, Prognon P, Taverna M. Capillary electrophoresis for rapid identification of monoclonal antibodies for routine application in hospital. Electrophoresis 2015; 36:2050-6. [PMID: 25964136 DOI: 10.1002/elps.201400603] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 03/25/2015] [Accepted: 04/25/2015] [Indexed: 11/08/2022]
Abstract
mAbs are widely used in cancer therapy. Their compounding, performed just before their administration to patients, is executed in a production unit of the hospital. Identification of these drugs, individually prepared in bags for infusion before patient administration, is of paramount importance to detect potential mistakes during compounding stage. A fast and reliable analytical method based on CZE combined to a cationic capillary coating (hexadimethrine bromide) was developed for identification of the most widely used compounded therapeutic for cancer therapy (bevacizumab, cetuximab, rituximab, and trastuzumab). Considering the high structural and physico-chemical similarities of these mAbs, an extensive optimization of the BGE composition has been performed. The addition of perchlorate ions and polysorbate in the BGE greatly increased the resolution. To validate the method, an internal standard was used and the relative migration times (RTm) were estimated. Very satisfactory RSDs of the RTm for rituximab (0.76%), cetuximab (0.46%), bevacizumab (0.31%), and trastuzumab (0.60%) were obtained. The intraday and interday RSD of the method were less than 0.32 and 1.3%, respectively for RTm. Significant differences between theses RTms have been demonstrated allowing mAbs identification. Finally, accurate mAbs identification has been demonstrated by a blind test.
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Affiliation(s)
- Emmanuel Jaccoulet
- Institut Galien Paris Sud, Université Paris Sud, Châtenay-Malabry, France.,CNRS UMR 8612, Châtenay-Malabry, France.,Hôpital Européen Georges Pompidou, Service Pharmacie (AP-HP), Paris, France
| | - Claire Smadja
- Institut Galien Paris Sud, Université Paris Sud, Châtenay-Malabry, France.,CNRS UMR 8612, Châtenay-Malabry, France
| | - Patrice Prognon
- Hôpital Européen Georges Pompidou, Service Pharmacie (AP-HP), Paris, France
| | - Myriam Taverna
- Institut Galien Paris Sud, Université Paris Sud, Châtenay-Malabry, France.,CNRS UMR 8612, Châtenay-Malabry, France
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Mai TD, Pereiro I, Hiraoui M, Viovy JL, Descroix S, Taverna M, Smadja C. Magneto-immunocapture with on-bead fluorescent labeling of amyloid-β peptides: towards a microfluidized-bed-based operation. Analyst 2015. [DOI: 10.1039/c5an01179e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Novel combination of Magneto-immunocapture and on-beads fluorescent labeling of Aβ peptides for their sensitive determination in cerebro spinal fluid samples.
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Affiliation(s)
- Thanh Duc Mai
- Université Paris-Sud
- Institut Galien Paris-Sud
- 92296 Châtenay-Malabry
- France
- CNRS
| | - Iago Pereiro
- Macromolecules and Microsystems in Biology and Medicine
- Institut Curie
- Centre National de Recherche Scientifique
- Université Pierre et Marie Curie
- UMR 168
| | - Mohamed Hiraoui
- Université Paris-Sud
- Institut Galien Paris-Sud
- 92296 Châtenay-Malabry
- France
- CNRS
| | - Jean-Louis Viovy
- Macromolecules and Microsystems in Biology and Medicine
- Institut Curie
- Centre National de Recherche Scientifique
- Université Pierre et Marie Curie
- UMR 168
| | - Stéphanie Descroix
- Macromolecules and Microsystems in Biology and Medicine
- Institut Curie
- Centre National de Recherche Scientifique
- Université Pierre et Marie Curie
- UMR 168
| | - Myriam Taverna
- Université Paris-Sud
- Institut Galien Paris-Sud
- 92296 Châtenay-Malabry
- France
- CNRS
| | - Claire Smadja
- Université Paris-Sud
- Institut Galien Paris-Sud
- 92296 Châtenay-Malabry
- France
- CNRS
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Bernardini M, Smadja C, Faraggi M, Orio S, Petitguillaume A, Desbrée A, Ghazzar N. Liver Selective Internal Radiation Therapy with 90Y resin microspheres: Comparison between pre-treatment activity calculation methods. Phys Med 2014; 30:752-64. [DOI: 10.1016/j.ejmp.2014.05.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 05/04/2014] [Accepted: 05/07/2014] [Indexed: 10/25/2022] Open
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25
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Horák D, Hlídková H, Hiraoui M, Taverna M, Proks V, Mázl Chánová E, Smadja C, Kučerová Z. Monodisperse carboxyl-functionalized poly(ethylene glycol)-coated magnetic poly(glycidyl methacrylate) microspheres: application to the immunocapture of β-amyloid peptides. Macromol Biosci 2014; 14:1590-9. [PMID: 25142028 DOI: 10.1002/mabi.201400249] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 07/04/2014] [Indexed: 12/21/2022]
Abstract
Identification and evaluation of small changes in β-amyloid peptide (Aβ) levels in cerebrospinal fluid is of crucial importance for early detection of Alzheimer's disease. Microfluidic detection methods enable effective preconcentration of Aβ using magnetic microparticles coated with Aβ antibodies. Poly(glycidyl methacrylate) microspheres are coated with α-amino-ω-methoxy-PEG5000 /α-amino-ω-Boc-NH-PEG5000 Boc groups deprotected and NH2 succinylated to introduce carboxyl groups. Capillary electrophoresis with laser-induced fluorescence detection confirms the efficient capture of Aβ 1-40 peptides on the microspheres with immobilized monoclonal anti-Aβ 6E10. The capture specificity is confirmed by comparing Aβ 1-40 levels on the anti-IgG-immobilized particles used as a control.
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Affiliation(s)
- Daniel Horák
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Heyrovský Sq. 2, 162 06, Prague 6, Czech Republic.
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26
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Ammar M, Smadja C, Ly GTP, Tandjigora D, Vigneron J, Etcheberry A, Taverna M, Dufour-Gergam E. Chemical engineering of self-assembled Alzheimer's peptide on a silanized silicon surface. Langmuir 2014; 30:5863-5872. [PMID: 24654702 DOI: 10.1021/la500695y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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 aim of this work is to develop a sensitive and specific immune-sensing platform dedicated to the detection of potential biomarkers of Alzheimer's disease (AD) in biological fluids. Accordingly, a controlled and adaptive surface functionalization of a silicon wafer with 7-octenyltrichlorosilane has been performed. The surface has extensively been characterized by atomic force microscopy (AFM; morphology) and X-ray photoelectron spectroscopy (XPS; chemical composition) and contact angle measurements. The wettability of the grafted chemical groups demonstrated the gradual trend from hydrophilic to hydrophobic surface during functionalization. XPS evidenced the presence of silanes on the surface after silanization, and even carboxylic groups as products from the oxidation step of the functionalization process. The characterization results permitted us to define an optimal protocol to reach a high-quality grafting yield. The issue of the quality of controlled chemical preparation on bioreceiving surfaces was also investigated by the recognition of one AD biomarker, the amyloid peptide Aβ 1-42. We have therefore evaluated the biological activity of the grafted anti Aβ antibodies onto this silanized surface by fluorescent microscopy. In conclusion, we have shown, both qualitatively and quantitatively, the uniformity of the optimized functionalization on slightly oxidized silicon surfaces, providing a reliable and chemically stable procedure to determine specific biomarkers of Alzheimer disease. This work opens the route to the integration of controlled immune-sensing applications on lab-on-chip systems.
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Affiliation(s)
- Mehdi Ammar
- Université Paris Sud , Institut d'Electronique Fondamentale, UMR 8622, Orsay F-91405, France
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27
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Fazavana J, Bianchini EP, Saller F, Smadja C, Picard V, Taverna M, Borgel D. A chemically-modified inactive antithrombin as a potent antagonist of fondaparinux and heparin anticoagulant activity. J Thromb Haemost 2013; 11:1128-36. [PMID: 23581397 DOI: 10.1111/jth.12249] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Indexed: 11/30/2022]
Abstract
BACKGROUND Heparin and its analogs, mediating their anticoagulant activity through antithrombin (AT) activation, remain largely used for the preventive and curative treatment of thrombosis. The major adverse reaction of these drugs is the bleeding risk associated with overdose. Unfractionnated heparin (UFH) can be efficiently and rapidly neutralized by protamine sulfate, but this reversal partially neutralizes low-molecular-weight heparin (LMWH) and is inefficient in reversing fondaparinux. To secure administration of AT-mediated anticoagulants and counteract bleeding disorders, we previously designed a recombinant inactive AT as an antidote to heparin derivatives. OBJECTIVES To get around the limited production level of recombinant AT, we propose in this study an alternative strategy to produce a chemically modified inactive AT, exhibiting increased heparin affinity, as an antagonist of heparin analogs. METHODS Plasma-derived AT was chemically modified with 2,3 butanedione, a diketone known to specifically react with the arginine side chain. The chemical reaction was conducted in the presence of heparin to preserve basic residues within the heparin binding site from modifications. RESULTS AT treated by butanedione and selected for its high heparin affinity (AT-BD) was indeed modified on reactive Arg393 and thus exhibited decreased anticoagulant activity and increased heparin affinity. AT-BD was able to neutralize anticoagulant activity of heparin derivatives in vitro and in vivo and was devoid of intrinsic anticoagulant activity, as assessed by activated partial thromboplastin time assay. CONCLUSIONS AT-BD appears to be as efficient as protamine to neutralize UFH in vivo but could be more largely used because it also reverses fondaparinux and LMWH.
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Affiliation(s)
- J Fazavana
- Laboratoire d'Hématologie, University Paris-Sud-XI, Châtenay-Malabry Cedex, France
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28
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Abbood A, Herrenknecht C, Proczek G, Descroix S, Rodrigo J, Taverna M, Smadja C. Hexylacrylate-based mixed-mode monolith, a stationary phase for the nano-HPLC separation of structurally related enkephalins. Anal Bioanal Chem 2011; 400:459-68. [DOI: 10.1007/s00216-011-4762-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Revised: 01/28/2011] [Accepted: 02/02/2011] [Indexed: 12/15/2022]
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Zhou JJ, Vieira FG, He XL, Smadja C, Liu R, Rozas J, Field LM. Genome annotation and comparative analyses of the odorant-binding proteins and chemosensory proteins in the pea aphid Acyrthosiphon pisum. Insect Mol Biol 2010; 19 Suppl 2:113-22. [PMID: 20482644 DOI: 10.1111/j.1365-2583.2009.00919.x] [Citation(s) in RCA: 148] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Odorant-binding proteins (OBPs) and chemosensory proteins (CSPs) are two families of small water-soluble proteins, abundant in the aqueous fluid surrounding olfactory receptor neurons in insect antennae. OBPs are involved in the first step of olfactory signal transduction, carrying airborne semiochemicals to the odorant receptors and can be classified into three groups: Classic OBPs, Plus-C OBPs and Atypical OBPs. Here, we identified and annotated genes encoding putative OBPs and CSPs in the pea aphid Acyrthosiphon pisum using bioinformatics. This identified genes encoding 13 Classic and two Plus-C OBPs and 13 CSPs. Homologous OBP sequences were also identified in nine other aphid species, allowing us to compare OBPs across several aphid and non-aphid species. We show that, although OBP sequences are divergent within a species and between different orders, there is a high similarity between orthologs within a range of aphid species. Furthermore, the phylogenetic relationships between OBP orthologs reflect the divergence of aphid evolution lineages. Our results support the 'birth-and-death' model as the major mechanism explaining aphid OBP sequence evolution, with the main force acting on the evolution being purifying selection.
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Affiliation(s)
- J-J Zhou
- Department of Biological Chemistry, Harpenden, Hertfordshire, UK
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30
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Carloni A, Sage E, Roudié J, Balzarotti R, Maitre S, Sbai-Idrissi M, Smadja C. Right colonic diverticulitis: an uncommon disease in western countries. Acta Chir Belg 2010; 110:57-9. [PMID: 20306911 DOI: 10.1080/00015458.2010.11680566] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
BACKGROUND AND AIMS Right colonic diverticulitis is not a frequent disease and its management is still controversial. In this study we describe our experience. MATERIAL AND METHODS We retrospectively reviewed all patients operated on because of a right colonic diverticulitis in our surgical unit. All patients were treated laparoscopically. Demographics, diagnostic and surgical results were recorded. RESULTS Between January 1994 and January 2007, 11 patients (7 males and 4 females) mean age 53 +/- 9 years (range 39-68), ASA 1: 6 patients, ASA 2: 4 patients, ASA 3: one patient, and BMI 27.8 (range 25-31), had right colonic diverticulitis. Four patients underwent emergency operations: one for peritonitis and three with an erroneous diagnosis of acute appendicitis; seven were operated on electively. There were no deaths or complications. The mean postoperative hospital stay was 5.6 days (range, 3-9). After a mean follow-up of 6.3 years (range 1-13) all patients of this series are symptom-free. INTERPRETATION AND CONCLUSION Right colon diverticulitis diagnosis remains difficult. A pre-operative imaging screening is necessary to successfully face this challenging disease. Laparoscopy is a safe and effective method to treat these patients. Colectomy should be considered a good therapeutic option for right colonic diverticulitis, although a conservative approach could be proposed in selected cases.
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Affiliation(s)
- A. Carloni
- Department of Digestive Surgery, Hôpital Antoine Béclère, Clamart Cedex France
| | - E. Sage
- Department of Digestive Surgery, Hôpital Antoine Béclère, Clamart Cedex France
| | - J. Roudié
- Department of Digestive Surgery, Hôpital Antoine Béclère, Clamart Cedex France
| | - R. Balzarotti
- Department of Digestive Surgery, Hôpital Antoine Béclère, Clamart Cedex France
| | - S. Maitre
- Department of Digestive Surgery, Hôpital Antoine Béclère, Clamart Cedex France
| | - M. Sbai-Idrissi
- Department of Digestive Surgery, Hôpital Antoine Béclère, Clamart Cedex France
| | - C. Smadja
- Department of Digestive Surgery, Hôpital Antoine Béclère, Clamart Cedex France
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31
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Abbood A, Smadja C, Taverna M, Herrenknecht C. High performance liquid chromatography separation of structurally related enkephalins on quaternary ammonium-embedded stationary phase in isocratic mode. J Chromatogr A 2010; 1217:450-8. [DOI: 10.1016/j.chroma.2009.11.058] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2009] [Revised: 11/13/2009] [Accepted: 11/17/2009] [Indexed: 12/15/2022]
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Marzouk P, Carloni A, Balzarotti R, Dumas De La Roque A, Smadja C. [Is strangulated obturator hernia still a clinical diagnosis?]. J Chir (Paris) 2009; 146:591-2. [PMID: 19766215 DOI: 10.1016/j.jchir.2009.08.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Abbood A, Smadja C, Herrenknecht C, Alahmad Y, Tchapla A, Taverna M. Retention mechanism of peptides on a stationary phase embedded with a quaternary ammonium group: A liquid chromatography study. J Chromatogr A 2009; 1216:3244-51. [DOI: 10.1016/j.chroma.2009.02.031] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2008] [Revised: 02/03/2009] [Accepted: 02/12/2009] [Indexed: 10/21/2022]
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De Vienne DM, Refrégier G, Hood ME, Guigue A, Devier B, Vercken E, Smadja C, Deseille A, Giraud T. Hybrid sterility and inviability in the parasitic fungal species complex Microbotryum. J Evol Biol 2009; 22:683-98. [PMID: 19228274 DOI: 10.1111/j.1420-9101.2009.01702.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Microbotryum violaceum, the anther-smut fungus, forms a complex of sibling species which specialize on different plants. Previous studies have shown the presence of partial ecological isolation and F1 inviability, but did not detect assortative mating apart from a high selfing rate. We investigated other post-mating barriers and show that F1 hybrid sterility, the inability of gametes to mate, increased gradually with the increasing genetic distance between the parents. F2 hybrids showed a reduced ability to infect the plants that was also correlated with the genetic distance. The host on which the F2 hybrids were passaged caused a selection for alleles derived from the pathogen species originally isolated from that host, but this effect was not detectable for the most closely related species. The post-mating barriers thus remain weak among the closest species pairs, suggesting that premating barriers are sufficient to initiate divergence in this system.
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Affiliation(s)
- D M De Vienne
- Ecologie, Systématique et Evolution, Université Paris-Sud, Orsay Cedex, France
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35
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Balzarotti R, Smadja C, Saint Yves G, Carloni A, Maitre S, Helmy N, Vons C. Elective versus urgent laparoscopic appendectomy for complicated appendicitis. MINERVA CHIR 2009; 64:9-16. [PMID: 19202531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
AIM Urgent appendectomy in patients with acute appendicitis (AA) complicated by abscess or phlegmon is associated with a high rate of complications. Recent developments in CT scanning have allowed patients with complicated appendicitis to be better identified. We choose to treat these patients with initial antibiotic therapy followed by elective appendectomy. We reported the results of this strategy and compared it with urgent appendectomy. METHODS A retrospective analysis of patients diagnosed with complicated acute appendicitis (CAA) between 1998 and 2007 treated either by urgent appendectomy or with antibiotic therapy and elective appendectomy was performed. We assessed the efficacy of antibiotic therapy for CAA. We compared the postoperative course between urgent and elective appendectomy. RESULTS We treated 56 patients with CAA: 40 by urgent appendectomy and 16 by antibiotics. All 16 patients improved with no need for urgent surgery, with 15 undergoing elective appendectomy. Postoperative complications were significantly lower in the elective group. Conversion rate and mean operative time were also lower but not significantly different. However, the duration of total hospital stay, antibiotic therapy and sick leave were higher. CONCLUSIONS Initial antibiotic therapy followed by elective appendectomy may be proposed in patients diagnosed with CAA.
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Affiliation(s)
- R Balzarotti
- Department of Digestive Surgery, Hôpital Antoine Béclère, Clamart Cedex, France
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36
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Le Nel A, Krenkova J, Kleparnik K, Smadja C, Taverna M, Viovy JL, Foret F. On-chip tryptic digest with direct coupling to ESI-MS using magnetic particles. Electrophoresis 2008; 29:4944-7. [DOI: 10.1002/elps.200800431] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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37
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Famechon C, Carloni A, Vons C, Smadja C. [Acute emphysematous cholecystitis: x-ray diagnosis]. J Chir (Paris) 2008; 145:478. [PMID: 19106871 DOI: 10.1016/s0021-7697(08)74660-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Affiliation(s)
- C Famechon
- Service de chirurgie générale, hôpital Antoine-Béclère - Clamart
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38
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Levicar N, Pai M, Habib NA, Tait P, Jiao LR, Marley SB, Davis J, Dazzi F, Smadja C, Jensen SL, Nicholls JP, Apperley JF, Gordon MY. Long-term clinical results of autologous infusion of mobilized adult bone marrow derived CD34+ cells in patients with chronic liver disease. Cell Prolif 2008; 41 Suppl 1:115-25. [PMID: 18181952 DOI: 10.1111/j.1365-2184.2008.00491.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Evidence is growing in support of the role of stem cells as an attractive alternative in treatment of liver diseases. Recently, we have demonstrated the feasibility and safety of infusing CD34(+) adult stem cells; this was performed on five patients with chronic liver disease. Here, we present the results of long-term follow-up of these patients. Between 1 x 10(6) and 2 x 10(8) CD34(+) cells were isolated and injected into the portal vein or hepatic artery. The patients were monitored for side effects, toxicity and changes in clinical, haematological and biochemical parameters; they were followed up for 12-18 months. All patients tolerated the treatment protocol well without any complications or side effects related to the procedure, also there were no side effects noted on long-term follow-up. Four patients showed an initial improvement in serum bilirubin level, which was maintained for up to 6 months. There was marginal increase in serum bilirubin in three of the patients at 12 months, while the fourth patient's serum bilirubin increased only at 18 months post-infusion. Computed tomography scan and serum alpha-foetoprotein monitoring showed absence of focal lesions. The study indicated that the stem cell product used was safe in the short and over long term, by absence of tumour formation. The investigation also illustrated that the beneficial effect seemed to last for around 12 months. This trial shows that stem cell therapy may have potential as a possible future therapeutic protocol in liver regeneration.
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Affiliation(s)
- N Levicar
- Department of Surgery, Imperial College London, Faculty of Medicine, London, UK
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Le Nel A, Minc N, Smadja C, Slovakova M, Bilkova Z, Peyrin JM, Viovy JL, Taverna M. Controlled proteolysis of normal and pathological prion protein in a microfluidic chip. Lab Chip 2008; 8:294-301. [PMID: 18231669 DOI: 10.1039/b715238h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A microreactor for proteinase K (PK)-mediated protein digestion was developed as a step towards the elaboration of a fully integrated microdevice for the detection of pathological prion protein (PrP). PK-grafted magnetic beads were immobilized inside a polydimethylsiloxane (PDMS) microchannel using a longitudinal magnetic field parallel to the flow direction and a magnetic field gradient, thereby forming a matrix for enzymatic digestion. This self-organization provided uniform pore sizes, a low flow resistance and a strong reaction efficiency due to a very thin diffusion layer. The microreactor's performance was first evaluated using a model substrate, succinyl-ala-ala-ala-paranitroanilide (SAAAP). Reaction kinetics were typically accelerated a hundred-fold as compared to conventional batch reactions. Reproducibility was around 98% for on-chip experiments. This microsystem was then applied to the digestion of prion protein from brain tissues. Controlled proteolysis could be obtained by varying the on-chip flow rate, while a complete proteolysis of normal protein was achieved in only three minutes. Extracts from normal and pathological brain homogenates were finally compared and strong discrimination between normal and pathological samples was demonstrated.
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Affiliation(s)
- Anne Le Nel
- Université Paris-Sud, JE2495, Protéines et Nanotechnologies en Sciences Séparatives, F-92296 Châtenay-Malabry Cedex, France
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Progent F, Taverna M, Banco A, Tchapla A, Smadja C. Chromatographic behaviour of peptides on a mixed-mode stationary phase with an embedded charged group by capillary electrochromatography and high-performance liquid chromatography. J Chromatogr A 2006; 1136:221-5. [PMID: 17081551 DOI: 10.1016/j.chroma.2006.09.095] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2005] [Revised: 09/11/2006] [Accepted: 09/22/2006] [Indexed: 10/24/2022]
Abstract
Retention behaviour of biological peptides was investigated on a stationary phase bearing an embedded quaternary ammonium group in a C21 alkyl chain by both high-performance liquid chromatography (HPLC) and capillary electrochromatography (CEC). In HPLC experiments, variation of acetonitrile (ACN) content in the mobile phase showed that peptides are mainly separated by RP mechanism. The weak or negative retention factors observed as compared to C18 silica stationary phase suggested the involvement of an electrostatic repulsion phenomenon in acidic conditions. Comparison of HPLC and CEC studies indicated that (i) ion-exclusion phenomenon is more pronounced in HPLC and (ii) higher ACN percentage in mobile phase induce for some peptides an increase of retention in CEC, pointing out the existence of mechanisms of retention other than partitioning mainly involved in chromatographic process. This comparative study demonstrated the critical role of electric field on peptide retention in CEC and supports the solvatation model of hydrolytic pillow proposed by Szumski and Buszewski for CEC using mixed mode stationary phase in CEC.
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Affiliation(s)
- F Progent
- Univ Paris-Sud, JE 2495, Protéines et Nanotechnologies en Sciences Séparatives, F-92296 Châtenay-Malabry Cedex, France
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Zhang H, Le Potier I, Smadja C, Zhang J, Taverna M. Fluorescent detection of peptides and amino acids for capillary electrophoresis via on-line derivatization with 4-fluoro-7-nitro-2,1,3-benzoxadiazole. Anal Bioanal Chem 2006; 386:1387-94. [PMID: 16953320 DOI: 10.1007/s00216-006-0709-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2006] [Revised: 07/22/2006] [Accepted: 07/25/2006] [Indexed: 10/24/2022]
Abstract
An in-capillary derivatization of amino acids and peptides with 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F) was developed for their subsequent capillary electrophoretic analysis with laser-induced fluorescence detection (lambda (ex)=488 nm). The in-capillary derivatization was achieved in zone-passing mode by introducing successive plugs of sample and NBD-F into a fused silica capillary previously equilibrated with an alkaline borate buffer. To prevent NBD-F hydrolysis and to achieve a reliable derivatization, NBD-F was prepared daily in absolute ethanol and a plug of absolute ethanol was introduced between the sample and NBD-F reagent plugs. Various parameters influencing the derivatization efficiency were investigated and the optimum conditions were as follows: background electrolyte (BGE), 20 mM borate buffer (pH 8.8); introduction time, 4 s for sample and 2 s for NBD-F; molar ratio of NBD-F/sample, above 215; temperature, 45 degrees C for amino acids and 35 degrees C for peptides; applied voltage, +15 kV. The validation of the in-capillary derivatization method under optimal conditions showed a good linearity between the heights of the derivative peaks and the concentrations of the amino acids. The intra-day relative standard deviations of the migration times and the peak heights were less than 1.3% and 4.6%, respectively. The efficient derivatization and separation of a mixture of valine, alanine, glutamic acid and aspartic acid were achieved using this technique. Peptides such as buccaline and beta-protein fragment 1-42 could also be derivatized using the developed in-capillary derivatization procedure.
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Affiliation(s)
- Hongyi Zhang
- College of Chemistry and Environmental Science, Hebei University, Baoding 071002, People's Republic of China.
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42
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Escartin C, Brouillet E, Gubellini P, Trioulier Y, Jacquard C, Smadja C, Knott GW, Goff LKL, Déglon N, Hantraye P, Bonvento G. Ciliary neurotrophic factor activates astrocytes, redistributes their glutamate transporters GLAST and GLT-1 to raft microdomains, and improves glutamate handling in vivo. J Neurosci 2006; 26:5978-89. [PMID: 16738240 PMCID: PMC6675222 DOI: 10.1523/jneurosci.0302-06.2006] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
To study the functional role of activated astrocytes in glutamate homeostasis in vivo, we used a model of sustained astrocytic activation in the rat striatum through lentiviral-mediated gene delivery of ciliary neurotrophic factor (CNTF). CNTF-activated astrocytes were hypertrophic, expressed immature intermediate filament proteins and highly glycosylated forms of their glutamate transporters GLAST and GLT-1. CNTF overexpression produced a redistribution of GLAST and GLT-1 into raft functional membrane microdomains, which are important for glutamate uptake. In contrast, CNTF had no detectable effect on the expression of a number of neuronal proteins and on the spontaneous glutamatergic transmission recorded from striatal medium spiny neurons. These results were replicated in vitro by application of recombinant CNTF on a mixed neuron/astrocyte striatal culture. Using microdialysis in the rat striatum, we found that the accumulation of extracellular glutamate induced by quinolinate (QA) was reduced threefold with CNTF. In line with this result, CNTF significantly increased QA-induced [(18)F]-fluoro-2-deoxyglucose uptake, an indirect index of glutamate uptake by astrocytes. Together, these data demonstrate that CNTF activation of astrocytes in vivo is associated with marked phenotypic and molecular changes leading to a better handling of increased levels of extracellular glutamate. Activated astrocytes may therefore be important prosurvival agents in pathological conditions involving defects in glutamate homeostasis.
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Abstract
Our study addressed reproductive character displacement between two subspecies of the house mouse, Mus musculus musculus and Mus musculus domesticus that hybridize in Europe along a zone where selection against hybridization is known to occur. Based on a multi-population approach, we investigated spatial patterns of divergence of mate preference in the two taxa. Mate preference was significantly higher in the contact zone than in allopatry in both subspecies, suggesting that reproductive character displacement occurs. Moreover, patterns of preference were stronger in M. m. musculus than in M. m. domesticus, indicating an asymmetrical divergence between the two. In the context of selection against hybridization, our results may provide empirical support for the hypothesis of reinforcement in a parapatric hybrid zone. We discuss factors that could explain the asymmetrical pattern of divergence and the possible impact of a unimodal structure on the maintenance of premating divergence between the two subspecies.
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Affiliation(s)
- C Smadja
- Laboratoire Génétique et Environnement, Institut des Sciences de l'Evolution de Montpellier, Université Montpellier II, Montpellier Cedex 5, France.
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Slovakova M, Minc N, Bilkova Z, Smadja C, Faigle W, Fütterer C, Taverna M, Viovy JL. Use of self assembled magnetic beads for on-chip protein digestion. Lab Chip 2005; 5:935-42. [PMID: 16100577 DOI: 10.1039/b504861c] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The use of grafted trypsin magnetic beads in a microchip for performing protein digestion is described. The PDMS device uses strong magnets to create a magnetic field parallel to the flow with a strong gradient pointing through the center of the chip channel. This allows for the formation of a low-hydrodynamic resistance plug of magnetic trypsin beads that serves as a matrix for protein digestion. This device represents an inexpensive way of fabricating a multi open-tubular-like column with an appropriate pore size for proteins. Kinetics studies of the hydrolysis of a model peptide show a 100-fold increase in digestion speed obtained by the microsystem when compared to a batch wise system. This system also offers the great advantage of easy replacement, as the bead matrix is easily washed out and replaced. High performance and reproducibility for digesting recombinant human growth hormone are confirmed by analysing the digest products in both CE and MALDI-TOF MS. Similar sequence coverage (of about 44%) is obtained from MS analysis of products after 10 minutes on-chip and 4 h with soluble trypsin in bulk.
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Affiliation(s)
- Marcela Slovakova
- Laboratoire Physicochimie-Curie, UMR/CNRS 168, Institut Curie, 75248 Paris Cedex 5, France
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Le Potier I, Franck G, Smadja C, Varlet S, Taverna M. In-capillary derivatization approach applied to the analysis of insulin by capillary electrophoresis with laser-induced fluorescence detection. J Chromatogr A 2004; 1046:271-6. [PMID: 15387198 DOI: 10.1016/j.chroma.2004.06.027] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
An in-capillary derivatization procedure of insulin for its subsequent capillary electrophoretic analysis (with laser-induced fluorescence detection) was developed. The in-capillary derivatization performed using the 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate (AQC) in a borate buffer pH 8.9, was achieved by successive introduction of plugs of sample and AQC reagent followed by application of a voltage (30 kV). Derivatization reaction results from the differential transport velocities that permit the distinct zones to penetrate each other under the applied field. Reagent/sample molar ratio (Rm) and plug lengths ratio were shown to have an influence on the efficiency of the derivatization reaction. A single peak could be obtained with a high reagent/sample molar ratio (Rm > or = 68). The tagged derivative peak intensity and efficiency were improved when reagent solution time injection was at least twice higher than that of insulin sample. The validation of the method showed a good linearity between the corrected area of the derivative peak and insulin concentrations. The relative standard deviations of the migration times and the corrected areas obtained for the tagged derivative were 2.3 and 4.6%, respectively. An efficient derivatization and separation of a mixture of insulin and two glycated forms of insulin was obtained using the technique.
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Affiliation(s)
- Isabelle Le Potier
- Faculté de Pharmacie, Groupe de Chimie Analytique de l'Université Paris-Sud, EA 3343, rue J.B. Clément, 92290 Châtenay-Malabry, France.
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Aïsenstein M, Smadja C. [Psychosomatic approach]. Journ Annu Diabetol Hotel Dieu 2004:187-93. [PMID: 15259316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
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Abstract
We study the form of the clines in a female mating preference and male display trait using simulations of a hybrid zone. Allopatric populations of two species are connected by demes in a stepping stone arrangement. Results show that reproductive character displacement (a pattern of increased prezygotic isolation in sympatry compared with allopatry) may or may not result when there is reinforcement (defined here as the strengthening of prezygotic isolation as a result of selection against hybrids, relative to the amount of prezygotic isolation present when hybrids are not selected against). Further, reproductive character displacement of the preference may or may not occur when it occurs in the male display. We conclude that the absence of reproductive character displacement is not evidence against the operation of reinforcement.
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Affiliation(s)
- A R Lemmon
- Section of Integrative Biology, University of Texas, Austin, TX 78712, USA.
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Mooslehner KA, Chan PM, Xu W, Liu L, Smadja C, Humby T, Allen ND, Wilkinson LS, Emson PC. Mice with very low expression of the vesicular monoamine transporter 2 gene survive into adulthood: potential mouse model for parkinsonism. Mol Cell Biol 2001; 21:5321-31. [PMID: 11463816 PMCID: PMC87256 DOI: 10.1128/mcb.21.16.5321-5331.2001] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We have created a transgenic mouse with a hypomorphic allele of the vesicular monoamine transporter 2 (Vmat2) gene by gene targeting. These mice (KA1) have profound changes in monoamine metabolism and function and survive into adulthood. Specifically, these animals express very low levels of VMAT2, an endogenous protein which sequesters monoamines intracellularly into vesicles, a process that, in addition to being important in normal transmission, may also act to keep intracellular levels of the monoamine neurotransmitters below potentially toxic thresholds. Homozygous mice show large reductions in brain tissue monoamines, motor impairments, enhanced sensitivity to dopamine agonism, and changes in the chemical neuroanatomy of the striatum that are consistent with alterations in the balance of the striatonigral (direct) and striatopallidal (indirect) pathways. The VMAT2-deficient KA1 mice are also more vulnerable to the neurotoxic effects of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine in terms of nigral dopamine cell death. We suggest that the mice may be of value in examining, long term, the insidious damaging consequences of abnormal intracellular handling of monoamines. On the basis of our current findings, the mice are likely to prove of immediate interest to aspects of the symptomatology of parkinsonism. They may also, however, be of use in probing other aspects of monoaminergic function and dysfunction in the brain, the latter making important contributions to the pathogenesis of schizophrenia and addiction.
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Affiliation(s)
- K A Mooslehner
- The Babraham Institute, Neurobiology Programme, Babraham, Cambridge CB2 4AT, United Kingdom.
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Boccara F, Rozenberg V, Buyukoglu B, Smadja C, Bardet J, Cohen A. [Comparative incidence of protrusive atheromatous plaques of the thoracic artery in patients with atrial fluter and atrial fibrillation]. Arch Mal Coeur Vaiss 2001; 94:16-22. [PMID: 11233476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Although it has been demonstrated recently that in patients with atrial fibrillation, protrusive atheromatous plaques of the thoracic aorta (thickness 4 mm) and left atrial abnormalities such as thrombosis, spontaneous contrast and low atrial blood flow velocities carry an additional embolic risk, this has not yet been studied in atrial flutter. Out of 2493 patients undergoing transoesophageal echocardiography between September 1993 and December 1997, 271 consecutive patients in atrial flutter (N = 41) or fibrillation (N = 230) for over 48 hours, underwent transoesophageal echocardiography before cardioversion. Patients with atrial flutter were compared with those with atrial fibrillation. Their characteristics were comparable with respect to age (68 +/- 13 and 67 +/- 12 years respectively, p = 0.628), sex ratio (men 66 and 54% respectively, p = 0.212), previous thromboembolic disease (5 and 15% respectively, p = 0.126). The incidence of protrusive aortic atheroma (12 and 11% respectively, p = 0.919), of spontaneous contrast in the thoracic aorta (15 and 14% respectively, p = 0.847) were identical in both groups. The left atrium was significantly smaller (3.1 +/- 0.7 and 6 +/- 3 cm2 respectively, p = 0.001), spontaneous atrial contrast less frequent (17 and 37% respectively, p = 0.024) and the velocities of atrial emptying higher (47 +/- 10 and 30 +/- 10 cm/s respectively, p = 0.030) in patients with flutter compared with atrial fibrillation. There was no difference in left ventricular fractional shortening (30 +/- 10 and 33 +/- 13% respectively, p = 0.630), the presence of rheumatic valvular disease (5 and 12%, p = 0.301), left atrial diameter (43 +/- 7 and 45 +/- 8, p = 0.134), right atrial surface area (16 +/- 4 and 17 +/- 6 cm2, p = 0.384) or in intraatrial thrombosis (2 and 3%, p = 0.888) respectively. These results show a high prevalence of protrusive atheroma of the thoracic aorta both in atrial flutter and in atrial fibrillation, and fewer left atrial abnormalities in patients with flutter.
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Affiliation(s)
- F Boccara
- Service de cardiologie, hôpital Saint-Antoine, 184, rue du Faubourg-Saint-Antoine, 75571 Paris
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