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Fradgley JD, Starck M, Laget M, Bourrier E, Dupuis E, Lamarque L, Trinquet E, Zwier JM, Parker D. Targeted pH switched europium complexes monitoring receptor internalisation in living cells. Chem Commun (Camb) 2021; 57:5814-5817. [PMID: 34002181 DOI: 10.1039/d1cc01029h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We report the design and evaluation of pH responsive luminescent europium(iii) probes that allow conjugation to targeting vectors to monitor receptor internalisation in cells. The approach adopted here can be used to tag proteins selectively and to monitor uptake into more acidic organelles, thereby enhancing the performance of time-resolved internalisation assays that require pH monitoring in real time.
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Affiliation(s)
- Jack D Fradgley
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
| | - Matthieu Starck
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
| | - Michel Laget
- Cisbio Bioassays, BP 84175, 30200 Codolet, France
| | | | | | | | | | | | - David Parker
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
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2
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Zindel D, Mensat P, Vol C, Homayed Z, Charrier-Savournin F, Trinquet E, Banères JL, Pin JP, Pannequin J, Roux T, Dupuis E, Prézeau L. G protein-coupled receptors can control the Hippo/YAP pathway through Gq signaling. FASEB J 2021; 35:e21668. [PMID: 34114695 DOI: 10.1096/fj.202002159r] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [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: 09/18/2020] [Revised: 04/21/2021] [Accepted: 04/30/2021] [Indexed: 11/11/2022]
Abstract
The Hippo pathway is an evolutionarily conserved kinase cascade involved in the control of tissue homeostasis, cellular differentiation, proliferation, and organ size, and is regulated by cell-cell contact, apical cell polarity, and mechanical signals. Miss-regulation of this pathway can lead to cancer. The Hippo pathway acts through the inhibition of the transcriptional coactivators YAP and TAZ through phosphorylation. Among the various signaling mechanisms controlling the hippo pathway, activation of G12/13 by G protein-coupled receptors (GPCR) recently emerged. Here we show that a GPCR, the ghrelin receptor, that activates several types of G proteins, including G12/13, Gi/o, and Gq, can activate YAP through Gq/11 exclusively, independently of G12/13. We revealed that a strong basal YAP activation results from the high constitutive activity of this receptor, which can be further increased upon agonist activation. Thus, acting on ghrelin receptor allowed to modulate up-and-down YAP activity, as activating the receptor increased YAP activity and blocking constitutive activity reduced YAP activity. Our results demonstrate that GPCRs can be used as molecular switches to finely up- or down-regulate YAP activity through a pure Gq pathway.
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Affiliation(s)
- Diana Zindel
- Institut de Génomique Fonctionnelle (IGF), Univ. Montpellier, CNRS, INSERM, Montpellier, France
| | | | - Claire Vol
- Institut de Génomique Fonctionnelle (IGF), Univ. Montpellier, CNRS, INSERM, Montpellier, France
| | - Zeinab Homayed
- Institut de Génomique Fonctionnelle (IGF), Univ. Montpellier, CNRS, INSERM, Montpellier, France
| | | | | | - Jean-Louis Banères
- Institut des Biomolécules Max Mousseron, Univ. Montpellier, CNRS, Montpellier, France
| | - Jean-Philippe Pin
- Institut de Génomique Fonctionnelle (IGF), Univ. Montpellier, CNRS, INSERM, Montpellier, France
| | - Julie Pannequin
- Institut de Génomique Fonctionnelle (IGF), Univ. Montpellier, CNRS, INSERM, Montpellier, France
| | | | | | - Laurent Prézeau
- Institut de Génomique Fonctionnelle (IGF), Univ. Montpellier, CNRS, INSERM, Montpellier, France
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3
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Cox SN, Elf JL, Lokhande R, Ogale YP, DiAndreth L, Dupuis E, Milovanovic M, Mpungose N, Mave V, Suryavanshi N, Gupta A, Martinson N, Golub JE, Mathad JS. Mobile phone access and comfort: implications for HIV and tuberculosis care in India and South Africa. Int J Tuberc Lung Dis 2020; 23:865-872. [PMID: 31439120 DOI: 10.5588/ijtld.18.0542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
SETTING: India and South Africa shoulder the greatest burden of tuberculosis (TB) and human immunodeficiency virus (HIV) infection respectively, but care retention is suboptimal.OBJECTIVE: We conducted a study in Pune, India, and Matlosana, South Africa, 1) to identify the factors associated with mobile phone access and comfort of use, 2) to assess access patterns.DESIGN: A cross-sectional study assessed mobile phone access, and comfort; a longitudinal study assessed access patterns.RESULTS: We enrolled 261 participants: 136 in India and 125 in South Africa. Between 1 week and 6 months, participant contact decreased from 90% (n = 122) to 57% (n = 75) in India and from 93% (n = 116) to 70% (n = 88) in South Africa. In the latter, a reason for a clinic visit for HIV management was associated with 63% lower odds of contact than other priorities (e.g., diabetes mellitus, maternal health, TB). In India, 57% (n = 78) reported discomfort with texting; discomfort was higher in the unemployed (adjusted OR [aOR] 4.97, 95%CI 1.12-22.09) and those aged ≥35 years (aOR 1.10, 95%CI 1.04-1.16) participants, but lower in those with higher education (aOR 0.04, 95% CI 0.01-1.14). In South Africa, 91% (n = 114) reported comfort with texting.CONCLUSION: Mobile phone contact was poor at 6 months. While mHealth could transform TB-HIV care, alternative approaches may be needed for certain subpopulations.
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Affiliation(s)
- S N Cox
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD
| | - J L Elf
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - R Lokhande
- Byramjee Jeejeebhoy Medical College (BJMC), Pune, India
| | - Y P Ogale
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD
| | - L DiAndreth
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, Johns Hopkins School of Nursing, Baltimore, MD, USA
| | - E Dupuis
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, Johns Hopkins School of Nursing, Baltimore, MD, USA
| | - M Milovanovic
- Perinatal HIV Research Unit, South Africa Medical Research Council Soweto Matlosana Collaborating Centre for HIV/AIDS and TB, University of the Witwatersrand, Soweto, South Africa
| | - N Mpungose
- Perinatal HIV Research Unit, South Africa Medical Research Council Soweto Matlosana Collaborating Centre for HIV/AIDS and TB, University of the Witwatersrand, Soweto, South Africa
| | - V Mave
- Johns Hopkins School of Medicine, Baltimore, MD, USA, BJMC-Johns Hopkins University Clinical Research Site, Pune, India
| | - N Suryavanshi
- Johns Hopkins School of Medicine, Baltimore, MD, USA, BJMC-Johns Hopkins University Clinical Research Site, Pune, India
| | - A Gupta
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, Johns Hopkins School of Medicine, Baltimore, MD, USA, BJMC-Johns Hopkins University Clinical Research Site, Pune, India
| | - N Martinson
- Perinatal HIV Research Unit, South Africa Medical Research Council Soweto Matlosana Collaborating Centre for HIV/AIDS and TB, University of the Witwatersrand, Soweto, South Africa
| | - J E Golub
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - J S Mathad
- **Department of Medicine, Weill Cornell Medicine, Center for Global Health, New York, NY, USA
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Coppens S, Dupuis E, Gillotay P, Costagliola S. P.111Modelling autosomal dominant centronuclear myopathy in zebrafish. Neuromuscul Disord 2019. [DOI: 10.1016/j.nmd.2019.06.167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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5
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Olagaray KE, Brouk MJ, Mamedova LK, Sivinski SE, Liu H, Robert F, Dupuis E, Zachut M, Bradford BJ. Dietary supplementation of Scutellaria baicalensis extract during early lactation decreases milk somatic cells and increases whole lactation milk yield in dairy cattle. PLoS One 2019; 14:e0210744. [PMID: 30673736 PMCID: PMC6343908 DOI: 10.1371/journal.pone.0210744] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Accepted: 12/30/2018] [Indexed: 11/18/2022] Open
Abstract
Systemic inflammation is common in early lactation dairy cows and is associated with decreased milk production. The Scutellaria baicalensis plant contains flavonoids with anti-inflammatory and anti-oxidative properties, which may counteract the inflammatory state in early lactation dairy cows. The objective of this experiment was to determine whether Scutellaria baicalensis extract (SBE), a source of bioactive flavonoids, would alter the adaptation to lactation. Multiparous Holstein cows (n = 122) were used in a randomized block design to determine the effect of short-term and long-term postpartum administration of SBE on 305-d milk yield, 120-d milk component yield, and early lactation milk markers of inflammation and metabolic function. Treatments were 1) control, 2) short term (5-d) administration of the SBE (SBE5), and 3) long term (60-d) administration of the SBE (SBE60). Treatments were included in a treatment pellet that was identical to a control pellet in ingredient source and composition except for the extract (10 g/d SBE providing 3.3 g/d of the flavonoid baicalin), both provided via an automated milking system beginning on d 1 of lactation. Milk samples were collected on d 1, 3, and once during d 5–12 of lactation, followed by weekly sampling until 120 days in milk (DIM). Milk samples collected in the first 2 wk were used for biomarker analysis (haptoglobin, β-hydroxybutyrate [BHB], and glucose-6-phosphate [G6P]), and all samples were used for composition analysis. Cows were body condition scored every 2 wk prepartum and postpartum. Milk production, programmed pellet allocation, and actual provision of both pelleted feeds were recorded daily. Treatment effects were evaluated by contrasts between control and SBE5 and control and SBE60 for both the treatment (TP; wk 1–9) and carryover periods (CP; wk 10–37). Total pellet offered was greater for SBE60 in both the TP (P < 0.01) and CP (P = 0.02) but was not different for SBE5 during either period (P ≥ 0.13). No treatment effects were observed for body condition score (BCS), milk haptoglobin, BHB, or G6P. SBE5 did not alter milk yield or milk components. SBE60 increased whole-lactation milk yield by 1,419 kg (13%; P = 0.03). SBE60 increased milk lactose and fat yields (P ≤ 0.04) and tended to increase milk protein yield (P = 0.09) during TP, and each increased during CP (P ≤ 0.04). Somatic cell count decreased by 10% in SBE60 during TP (P = 0.02) but not CP (P = 0.13). Mastitis incidence tended to differ by treatment, being lesser for both SBE5 and SBE60 vs. control (14 and 15% vs. 33%). SBE supplementation did not impact time to pregnancy or hazard of leaving the herd. In conclusion, despite no detected treatment effects on BCS or milk biomarkers of inflammation and metabolic status, supplementation of postpartum dairy cows with Scutellaria baicalensis extract for 60 d was effective at increasing whole lactation milk yield.
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Affiliation(s)
- K. E. Olagaray
- Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas, United States of America
| | - M. J. Brouk
- Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas, United States of America
| | - L. K. Mamedova
- Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas, United States of America
| | - S. E. Sivinski
- Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas, United States of America
| | - H. Liu
- Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas, United States of America
| | | | | | - M. Zachut
- Agriculture Research Organization, Volcani Center, Rishon Lezion, Israel
| | - B. J. Bradford
- Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas, United States of America
- * E-mail:
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Heuninck J, Hounsou C, Dupuis E, Trinquet E, Mouillac B, Pin JP, Bonnet D, Durroux T. Time-Resolved FRET-Based Assays to Characterize G Protein-Coupled Receptor Hetero-oligomer Pharmacology. Methods Mol Biol 2019; 1947:151-168. [PMID: 30969415 DOI: 10.1007/978-1-4939-9121-1_8] [Citation(s) in RCA: 2] [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: 06/09/2023]
Abstract
Although G protein-coupled receptor (GPCR) oligomerization is a matter of debate, it has been shown that the nature of the GPCR partners within the oligomers can influence the pharmacological properties of the receptors. Therefore, finding specific ligands for homo- or hetero-oligomers opens new perspectives for drug discovery. However, no efficient experimental strategy to screen for such ligands existed yet. Indeed, conventional binding strategies do not discriminate ligand binding on GPCR monomers, homo- or hetero-oligomers. To address this issue, we recently developed a new assay based on a time-resolved FRET method that is easy to implement and that can focus on ligand binding specifically on the hetero-oligomer.
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Affiliation(s)
- Joyce Heuninck
- CNRS, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France
- INSERM, U. 1191, Montpellier, France
- Université de Montpellier, Montpellier, France
| | - Candide Hounsou
- CNRS, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France
- INSERM, U. 1191, Montpellier, France
- Université de Montpellier, Montpellier, France
| | | | | | - Bernard Mouillac
- CNRS, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France
- INSERM, U. 1191, Montpellier, France
- Université de Montpellier, Montpellier, France
| | - Jean-Philippe Pin
- CNRS, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France
- INSERM, U. 1191, Montpellier, France
- Université de Montpellier, Montpellier, France
| | - Dominique Bonnet
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR7200 CNRS/Université de Strasbourg, LabEx MEDALIS, Illkirch, France.
| | - Thierry Durroux
- CNRS, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France.
- INSERM, U. 1191, Montpellier, France.
- Université de Montpellier, Montpellier, France.
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Zindel D, Vol C, Lecha O, Bequignon I, Bilgic M, Vereecke M, Charrier-Savournin F, Romier M, Trinquet E, Pin JP, Pannequin J, Roux T, Dupuis E, Prézeau L. HTRF ® Total and Phospho-YAP (Ser127) Cellular Assays. Methods Mol Biol 2019; 1893:153-166. [PMID: 30565133 DOI: 10.1007/978-1-4939-8910-2_13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The YAP protein is a co-transcription factor increasing the expression of genes involved in cell proliferation and repressing the expression of genes important for cell differentiation and apoptosis. It is regulated by several inputs, like the Hippo pathway, through the action of kinases that phosphorylate YAP on several residues. The level of phosphorylation of the residues serine 127 (S127) of YAP is generally assessed in cellular models, native tissues, and organs, as a marker of YAP activity and location, and is regulated by numerous partners. This phosphorylation event is classically detected using a western blot technical approach. Here, we describe a novel approach to detect both the relative amount of total YAP (T-YAP assay) and the phosphorylation of the residue S127 of YAP (S127-P-YAP assay) using a HTRF®-based method. This easy-to-run method can easily be miniaturized and allows for a high-throughput analysis in 96/384-well plate format, requiring less cellular material and being more rapid than other approaches.
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Affiliation(s)
- Diana Zindel
- IGF, Univ Montpellier, CNRS, INSERM, Montpellier, France
| | - Claire Vol
- IGF, Univ Montpellier, CNRS, INSERM, Montpellier, France
| | - Odile Lecha
- IGF, Univ Montpellier, CNRS, INSERM, Montpellier, France
| | | | - Merve Bilgic
- IGF, Univ Montpellier, CNRS, INSERM, Montpellier, France
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8
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Belhocine A, Veglianese P, Hounsou C, Dupuis E, Acher F, Durroux T, Goudet C, Pin JP. Profiling of orthosteric and allosteric group-III metabotropic glutamate receptor ligands on various G protein-coupled receptors with Tag-lite ® assays. Neuropharmacology 2018; 140:233-245. [PMID: 30099051 DOI: 10.1016/j.neuropharm.2018.07.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 03/05/2018] [Revised: 07/25/2018] [Accepted: 07/26/2018] [Indexed: 12/21/2022]
Abstract
Group-III metabotropic glutamate (mGlu) receptors are important synaptic regulators and are potential druggable targets for Parkinson disease, autism and pain. Potential drugs include orthosteric agonists in the glutamate binding extracellular domain and positive allosteric modulators interacting with seven-pass transmembrane domains. Orthosteric agonists are rarely completely specific for an individual group-III mGlu subtype. Furthermore they often fail to pass the blood-brain barrier and they constitutively activate their target receptor. These properties limit the potential therapeutic use of orthosteric agonists. Allosteric modulators are more specific and maintain the biological activity of the targeted receptor. However, they bind in a hydrophobic pocket and this limits their bio-availability and increases possible off-target action. It is therefore important to characterize the action of potential drug targets with a multifaceted and deeply informative assay. Here we aimed at multifaceted deep profiling of the effect of seven different agonists, and seven positive allosteric modulators on 34 different G protein-coupled receptors by a Tag-lite® assay. Our results did not reveal off-target activity of mGlu orthosteric agonists. However, five allosteric modulators had either positive or negative effects on non-cognate G protein-coupled receptors. In conclusion, we demonstrate the power of the Tag-lite® assay for potential drug ligand profiling on G protein-coupled receptors and its potential to identify positive allosteric compounds.
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Affiliation(s)
| | | | | | | | - Francine Acher
- Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicologiques, CNRS UMR8601, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | | | - Cyril Goudet
- IGF, Univ. Montpellier, CNRS, INSERM, Montpellier, France
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9
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Chemouny J, Sannier A, Hanouna G, Raimbourg Q, Dupuis E, Daugas E, Vrtovsnik F. Résultats d’une enquête sur les indications de biopsie rénale chez les patients diabétiques protéinuriques au sein de la communauté néphrologique française. Nephrol Ther 2018. [DOI: 10.1016/j.nephro.2018.07.285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Hounsou C, Baehr C, Gasparik V, Alili D, Belhocine A, Rodriguez T, Dupuis E, Roux T, Mann A, Heissler D, Pin JP, Durroux T, Bonnet D, Hibert M. From the Promiscuous Asenapine to Potent Fluorescent Ligands Acting at a Series of Aminergic G-Protein-Coupled Receptors. J Med Chem 2017; 61:174-188. [PMID: 29219316 DOI: 10.1021/acs.jmedchem.7b01220] [Citation(s) in RCA: 9] [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: 11/28/2022]
Abstract
Monoamine neurotransmitters such as serotonin, dopamine, histamine, and noradrenaline have important and varied physiological functions and similar chemical structures. Representing important pharmaceutical drug targets, the corresponding G-protein-coupled receptors (termed aminergic GPCRs) belong to the class of cell membrane receptors and share many levels of similarity as well. Given their pharmacological and structural closeness, one could hypothesize the possibility to derivatize a ubiquitous ligand to afford rapidly fluorescent probes for a large set of GPCRs to be used for instance in FRET-based binding assays. Here we report fluorescent derivatives of the nonselective agent asenapine which were designed, synthesized, and evaluated as ligands of 34 serotonin, dopamine, histamine, melatonin, acetylcholine, and adrenergic receptors. It appears that this strategy led rapidly to the discovery and development of nanomolar affinity fluorescent probes for 14 aminergic GPCRs. Selected probes were tested in competition binding assays with unlabeled competitors in order to demonstrate their suitability for drug discovery purposes.
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Affiliation(s)
- Candide Hounsou
- Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, Université de Montpellier (IFR3) , 141 Rue de la Cardonille, F-34094 Montpellier Cedex 5, France
| | - Corinne Baehr
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR7200 CNRS, Université de Strasbourg , 74 Route du Rhin, 67412 Illkirch, France
| | - Vincent Gasparik
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR7200 CNRS, Université de Strasbourg , 74 Route du Rhin, 67412 Illkirch, France
| | - Doria Alili
- Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, Université de Montpellier (IFR3) , 141 Rue de la Cardonille, F-34094 Montpellier Cedex 5, France
| | - Abderazak Belhocine
- Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, Université de Montpellier (IFR3) , 141 Rue de la Cardonille, F-34094 Montpellier Cedex 5, France
| | - Thiéric Rodriguez
- Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, Université de Montpellier (IFR3) , 141 Rue de la Cardonille, F-34094 Montpellier Cedex 5, France
| | - Elodie Dupuis
- Cisbio Bioassays , Parc Marcel Boiteux, BP84175, 30200 Codolet, France
| | - Thomas Roux
- Cisbio Bioassays , Parc Marcel Boiteux, BP84175, 30200 Codolet, France
| | - André Mann
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR7200 CNRS, Université de Strasbourg , 74 Route du Rhin, 67412 Illkirch, France
| | - Denis Heissler
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR7200 CNRS, Université de Strasbourg , 74 Route du Rhin, 67412 Illkirch, France.,LabEx Medalis, Université de Strasbourg , 67000 Strasbourg, France
| | - Jean-Philippe Pin
- Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, Université de Montpellier (IFR3) , 141 Rue de la Cardonille, F-34094 Montpellier Cedex 5, France
| | - Thierry Durroux
- Institut de Génomique Fonctionnelle, CNRS UMR5203, INSERM U661, Université de Montpellier (IFR3) , 141 Rue de la Cardonille, F-34094 Montpellier Cedex 5, France
| | - Dominique Bonnet
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR7200 CNRS, Université de Strasbourg , 74 Route du Rhin, 67412 Illkirch, France.,LabEx Medalis, Université de Strasbourg , 67000 Strasbourg, France
| | - Marcel Hibert
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR7200 CNRS, Université de Strasbourg , 74 Route du Rhin, 67412 Illkirch, France.,LabEx Medalis, Université de Strasbourg , 67000 Strasbourg, France
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11
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Scholler P, Nevoltris D, de Bundel D, Bossi S, Moreno-Delgado D, Rovira X, Møller TC, El Moustaine D, Mathieu M, Blanc E, McLean H, Dupuis E, Mathis G, Trinquet E, Daniel H, Valjent E, Baty D, Chames P, Rondard P, Pin JP. Allosteric nanobodies uncover a role of hippocampal mGlu2 receptor homodimers in contextual fear consolidation. Nat Commun 2017; 8:1967. [PMID: 29213077 PMCID: PMC5719040 DOI: 10.1038/s41467-017-01489-1] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 09/15/2017] [Indexed: 11/09/2022] Open
Abstract
Antibodies have enormous therapeutic and biotechnology potential. G protein-coupled receptors (GPCRs), the main targets in drug development, are of major interest in antibody development programs. Metabotropic glutamate receptors are dimeric GPCRs that can control synaptic activity in a multitude of ways. Here we identify llama nanobodies that specifically recognize mGlu2 receptors, among the eight subtypes of mGluR subunits. Among these nanobodies, DN10 and 13 are positive allosteric modulators (PAM) on homodimeric mGlu2, while DN10 displays also a significant partial agonist activity. DN10 and DN13 have no effect on mGlu2-3 and mGlu2-4 heterodimers. These PAMs enhance the inhibitory action of the orthosteric mGlu2/mGlu3 agonist, DCG-IV, at mossy fiber terminals in the CA3 region of hippocampal slices. DN13 also impairs contextual fear memory when injected in the CA3 region of hippocampal region. These data highlight the potential of developing antibodies with allosteric actions on GPCRs to better define their roles in vivo. G protein-coupled receptors are considered promising therapeutic targets. Here, the authors have identified nanobodies, or single-domain llama antibodies, that specifically enhance agonist-induced activity of a type of G protein-coupled receptor, the mGlu2 receptor.
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Affiliation(s)
- Pauline Scholler
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France.,Cisbio Bioassays, F-30200, Codolet, France
| | - Damien Nevoltris
- Cisbio Bioassays, F-30200, Codolet, France.,Aix Marseille Univ, CNRS, INSERM, Institut Paoli-Calmettes, CRCM, F-13009, Marseille, France
| | - Dimitri de Bundel
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France
| | - Simon Bossi
- CNRS UMR9197, Université Paris-Sud, Institut des Neurosciences Paris-Saclay, F-91405, Orsay, France
| | - David Moreno-Delgado
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France
| | - Xavier Rovira
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France
| | - Thor C Møller
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France
| | - Driss El Moustaine
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France
| | - Michaël Mathieu
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France
| | - Emilie Blanc
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France
| | - Heather McLean
- CNRS UMR9197, Université Paris-Sud, Institut des Neurosciences Paris-Saclay, F-91405, Orsay, France
| | | | | | | | - Hervé Daniel
- CNRS UMR9197, Université Paris-Sud, Institut des Neurosciences Paris-Saclay, F-91405, Orsay, France
| | - Emmanuel Valjent
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France
| | - Daniel Baty
- Aix Marseille Univ, CNRS, INSERM, Institut Paoli-Calmettes, CRCM, F-13009, Marseille, France
| | - Patrick Chames
- Aix Marseille Univ, CNRS, INSERM, Institut Paoli-Calmettes, CRCM, F-13009, Marseille, France.
| | - Philippe Rondard
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France.
| | - Jean-Philippe Pin
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Univ. Montpellier, F-34094, Montpellier, France.
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12
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Simon J, Kurdzielewicz S, Jeanniot E, Dupuis E, Marnef F, Aubert D, Villena I, Poulle ML. Spatial distribution of soil contaminated with Toxoplasma gondii oocysts in relation to the distribution and use of domestic cat defecation sites on dairy farms. Int J Parasitol 2017; 47:357-367. [DOI: 10.1016/j.ijpara.2017.01.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 01/05/2017] [Accepted: 01/10/2017] [Indexed: 11/25/2022]
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13
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Valencia C, Dujet C, Margathe JF, Iturrioz X, Roux T, Trinquet E, Villa P, Hibert M, Dupuis E, Llorens-Cortes C, Bonnet D. A Time-Resolved FRET Cell-Based Binding Assay for the Apelin Receptor. ChemMedChem 2017; 12:925-931. [DOI: 10.1002/cmdc.201700106] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/04/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Christel Valencia
- Université de Strasbourg, CNRS; Plateforme de Chimie Biologie Intégrative, PCBIS, UMS3286, Labex MEDALIS; 6700 Strasbourg France
| | - Céline Dujet
- Cisbio Bioassays; Parc Marcel Boiteux; BP 84175 30200 Codolet France
| | - Jean-François Margathe
- Université de Strasbourg, CNRS; Laboratoire d'Innovation Thérapeutique (LIT), UMR7200, Labex MEDALIS; 6700 Strasbourg France
| | - Xavier Iturrioz
- Neuropeptides Centraux et Régulations Hydrique et cardiovasculaire; UMR 7241/Inserm U1050, CIRB, Collège de France; 11 place Marcelin Berthelot 75231 Paris Cedex 05 France
| | - Thomas Roux
- Cisbio Bioassays; Parc Marcel Boiteux; BP 84175 30200 Codolet France
| | - Eric Trinquet
- Cisbio Bioassays; Parc Marcel Boiteux; BP 84175 30200 Codolet France
| | - Pascal Villa
- Université de Strasbourg, CNRS; Plateforme de Chimie Biologie Intégrative, PCBIS, UMS3286, Labex MEDALIS; 6700 Strasbourg France
| | - Marcel Hibert
- Université de Strasbourg, CNRS; Laboratoire d'Innovation Thérapeutique (LIT), UMR7200, Labex MEDALIS; 6700 Strasbourg France
| | - Elodie Dupuis
- Cisbio Bioassays; Parc Marcel Boiteux; BP 84175 30200 Codolet France
| | - Catherine Llorens-Cortes
- Neuropeptides Centraux et Régulations Hydrique et cardiovasculaire; UMR 7241/Inserm U1050, CIRB, Collège de France; 11 place Marcelin Berthelot 75231 Paris Cedex 05 France
| | - Dominique Bonnet
- Université de Strasbourg, CNRS; Laboratoire d'Innovation Thérapeutique (LIT), UMR7200, Labex MEDALIS; 6700 Strasbourg France
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14
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Perrin HB, Cintas P, Abravanel F, Gérolami R, d'Alteroche L, Raynal JN, Alric L, Dupuis E, Prudhomme L, Vaucher E, Couzigou P, Liversain JM, Bureau C, Vinel JP, Kamar N, Izopet J, Peron JM. Neurologic Disorders in Immunocompetent Patients with Autochthonous Acute Hepatitis E. Emerg Infect Dis 2016; 21:1928-34. [PMID: 26490255 PMCID: PMC4622229 DOI: 10.3201/eid2111.141789] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Neurologic disorders, mainly Guillain-Barré syndrome and Parsonage–Turner syndrome (PTS), have been described in patients with hepatitis E virus (HEV) infection in industrialized and developing countries. We report a wider range of neurologic disorders in nonimmunocompromised patients with acute HEV infection. Data from 15 French immunocompetent patients with acute HEV infection and neurologic disorders were retrospectively recorded from January 2006 through June 2013. The disorders could be divided into 4 main entities: mononeuritis multiplex, PTS, meningoradiculitis, and acute demyelinating neuropathy. HEV infection was treated with ribavirin in 3 patients (for PTS or mononeuritis multiplex). One patient was treated with corticosteroids (for mononeuropathy multiplex), and 5 others received intravenous immunoglobulin (for PTS, meningoradiculitis, Guillain-Barré syndrome, or Miller Fisher syndrome). We conclude that pleiotropic neurologic disorders are seen in HEV-infected immunocompetent patients. Patients with acute neurologic manifestations and aminotransferase abnormalities should be screened for HEV infection.
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15
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Kerambrun E, Palos Ladeiro M, Bigot-Clivot A, Dedourge-Geffard O, Dupuis E, Villena I, Aubert D, Geffard A. Zebra mussel as a new tool to show evidence of freshwater contamination by waterborne Toxoplasma gondii. J Appl Microbiol 2016; 120:498-508. [DOI: 10.1111/jam.12999] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 10/01/2015] [Accepted: 10/23/2015] [Indexed: 01/01/2023]
Affiliation(s)
- E. Kerambrun
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
| | - M. Palos Ladeiro
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
- Laboratoire de Parasitologie-Mycologie; EA 3800 SFR CAP-Santé FED 4231; Hôpital Maison Blanche; Reims France
| | - A. Bigot-Clivot
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
| | - O. Dedourge-Geffard
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
| | - E. Dupuis
- Laboratoire de Parasitologie-Mycologie; EA 3800 SFR CAP-Santé FED 4231; Hôpital Maison Blanche; Reims France
| | - I. Villena
- Laboratoire de Parasitologie-Mycologie; EA 3800 SFR CAP-Santé FED 4231; Hôpital Maison Blanche; Reims France
| | - D. Aubert
- Laboratoire de Parasitologie-Mycologie; EA 3800 SFR CAP-Santé FED 4231; Hôpital Maison Blanche; Reims France
| | - A. Geffard
- Unité Stress Environnementaux et Biosurveillance des milieux aquatiques; UMR-I 02 (SEBIO); Université de Reims Champagne Ardenne; Reims France
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16
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Blanc E, Wagner P, Plaisier F, Schmitt M, Durroux T, Bourguignon JJ, Partiseti M, Dupuis E, Bihel F. Design and validation of a homogeneous time-resolved fluorescence cell-based assay targeting the ligand-gated ion channel 5-HT3A. Anal Biochem 2015; 484:105-12. [PMID: 25998104 DOI: 10.1016/j.ab.2015.03.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 11/26/2014] [Revised: 03/16/2015] [Accepted: 03/24/2015] [Indexed: 11/29/2022]
Abstract
Ligand-gated ion channels (LGICs) are considered as attractive protein targets in the search for new therapeutic agents. Nowadays, this strategy involves the capability to screen large chemical libraries. We present a new Tag-lite ligand binding assay targeting LGICs on living cells. This technology combines the use of suicide enzyme tags fused to channels of interest with homogeneous time-resolved fluorescence (HTRF) as the detection readout. Using the 5-HT3 receptor as system model, we showed that the pharmacology of the HALO-5HT3 receptor was identical to that of the native receptor. After validation of the assay by using 5-HT3 agonists and antagonists of reference, a pilot screen enabled us to identify azelastine, a well-known histamine H1 antagonist, as a potent 5-HT3 antagonist. This interesting result was confirmed with electrophysiological experiments. The method described here is easy to implement and could be applicable for other LGICs, opening new ways for the screening of chemical libraries.
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Affiliation(s)
- Emilie Blanc
- Cisbio Bioassays, 30200 Codolet, France; Institut de Génomique Fonctionnelle, Département de Pharmacologie Moléculaire, CNRS UMR 5203, INSERM U661, Université Montpellier I et II, 34094 Montpellier Cedex 5, France
| | - Patrick Wagner
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR 7200 CNRS/Université de Strasbourg, 67401 Illkirch, France
| | - Fabrice Plaisier
- Sanofi R&D, Research Center of Vitry/Alfortville, 94403 Vitry-sur-Seine, France
| | - Martine Schmitt
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR 7200 CNRS/Université de Strasbourg, 67401 Illkirch, France
| | - Thierry Durroux
- Institut de Génomique Fonctionnelle, Département de Pharmacologie Moléculaire, CNRS UMR 5203, INSERM U661, Université Montpellier I et II, 34094 Montpellier Cedex 5, France
| | - Jean-Jacques Bourguignon
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR 7200 CNRS/Université de Strasbourg, 67401 Illkirch, France
| | - Michel Partiseti
- Sanofi R&D, Research Center of Vitry/Alfortville, 94403 Vitry-sur-Seine, France
| | | | - Frederic Bihel
- Laboratoire d'Innovation Thérapeutique, Faculté de Pharmacie, UMR 7200 CNRS/Université de Strasbourg, 67401 Illkirch, France.
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17
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Nevoltris D, Lombard B, Dupuis E, Mathis G, Chames P, Baty D. Conformational nanobodies reveal tethered epidermal growth factor receptor involved in EGFR/ErbB2 predimers. ACS Nano 2015; 9:1388-1399. [PMID: 25603171 DOI: 10.1021/nn505752u] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The epidermal growth factor receptor (EGFR) is a cell-surface receptor with a single transmembrane domain and tyrosine kinase activity carried by the intracellular domain. This receptor is one of the four members of the ErbB family including ErbB2, ErbB3, and ErbB4. Ligand binding, like EGF binding, induces a conformational rearrangement of the receptor and induces a homo/hetero dimerization essentially with ErbB family receptors that leads to the phosphorylation of the kinase domain, triggering a signaling cascade. EGFR can also form inactive dimers in a ligand-independent way through interactions between cytoplasmic domains. To date, the conformation of EGFR extracellular domain engaged in these inactive dimers remains unclear. In this study, we describe the successful selection and characterization of llama anti-EGFR nanobodies and their use as innovative conformational sensors. We isolated three different specific anti-EGFR clones binding to three distinct epitopes. Interestingly, the binding of all three nanobodies was found highly sensitive to ligand stimulation. Two nanobodies, D10 and E10, can only bind the ligand-free EGFR conformation characterized by an intramolecular tether between domains II and IV, whereas nanobody G10 binds both ligand-free and ligand activated EGFR, with an 8-fold higher affinity for the extended conformation in the presence of ligand. Here we took advantage of these conformational probes to reveal the existence of tethered EGFR in EGFR/ErbB2 predimers. These biosensors represent important tools allowing the determination of EGFR conformations and should help the design of relevant inhibitors.
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Affiliation(s)
- Damien Nevoltris
- Institut National de la Santé et de la Recherche Médicale , U1068, Centre de Recherche en Cancérologie de Marseille, Marseille F-13009, France
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18
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Hounsou C, Margathe JF, Oueslati N, Belhocine A, Dupuis E, Thomas C, Mann A, Ilien B, Rognan D, Trinquet E, Hibert M, Pin JP, Bonnet D, Durroux T. Time-resolved FRET binding assay to investigate hetero-oligomer binding properties: proof of concept with dopamine D1/D3 heterodimer. ACS Chem Biol 2015; 10:466-74. [PMID: 25350273 DOI: 10.1021/cb5007568] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
G protein-coupled receptors (GPCRs) have been described to form hetero-oligomers. The importance of these complexes in physiology and pathology is considered crucial, and heterodimers represent promising new targets to discover innovative therapeutics. However, there is a lack of binding assays to allow the evaluation of ligand affinity for GPCR hetero-oligomers. Using dopamine receptors and more specifically the D1 and D3 receptors as GPCR models, we developed a new time-resolved FRET (TR-FRET) based assay to determine ligand affinity for the D1/D3 heteromer. Based on the high-resolution structure of the dopamine D3 receptor (D3R), six fluorescent probes derived from a known D3R partial agonist (BP 897) were designed, synthesized and evaluated as high affinity and selective ligands for the D3/D2 receptors, and for other dopamine receptor subtypes. The highest affinity ligand 21 was then employed in the development of the D1/D3 heteromer assay. The TR-FRET was monitored between a fluorescent tag donor carried by the D1 receptor (D1R) and a fluorescent acceptor D3R ligand 21. The newly reported assay, easy to implement on other G protein-coupled receptors, constitutes an attractive strategy to screen for heteromer ligands.
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Affiliation(s)
- Candide Hounsou
- CNRS UMR 5203, and INSERM U661, and Université Montpellier I et II, Institut de Génomique Fonctionnelle, Département de Pharmacologie Moléculaire, 141 rue de la Cardonille, 34094 Montpellier Cedex 5, France
| | - Jean-François Margathe
- Laboratoire d’Innovation
Thérapeutique, UMR7200 CNRS/Université de Strasbourg,
Labex MEDALIS, Faculté de Pharmacie, 74 route du Rhin, 67412 Illkirch, France
| | - Nadia Oueslati
- CNRS UMR 5203, and INSERM U661, and Université Montpellier I et II, Institut de Génomique Fonctionnelle, Département de Pharmacologie Moléculaire, 141 rue de la Cardonille, 34094 Montpellier Cedex 5, France
| | - Abderazak Belhocine
- CNRS UMR 5203, and INSERM U661, and Université Montpellier I et II, Institut de Génomique Fonctionnelle, Département de Pharmacologie Moléculaire, 141 rue de la Cardonille, 34094 Montpellier Cedex 5, France
| | - Elodie Dupuis
- Cisbio Bioassays,
Parc Marcel Boiteux, BP84175, 30200 Codolet, France
| | - Cécile Thomas
- Laboratoire d’Innovation
Thérapeutique, UMR7200 CNRS/Université de Strasbourg,
Labex MEDALIS, Faculté de Pharmacie, 74 route du Rhin, 67412 Illkirch, France
| | - André Mann
- Laboratoire d’Innovation
Thérapeutique, UMR7200 CNRS/Université de Strasbourg,
Labex MEDALIS, Faculté de Pharmacie, 74 route du Rhin, 67412 Illkirch, France
| | - Brigitte Ilien
- Unité Biotechnologie
et Signalisation Cellulaire, UMR 7242 CNRS/Université de Strasbourg,
Labex MEDALIS, Ecole Supérieure de Biotechnologie de Strasbourg, 300 Bvd S. Brant, 67412 Illkirch, France
| | - Didier Rognan
- Laboratoire d’Innovation
Thérapeutique, UMR7200 CNRS/Université de Strasbourg,
Labex MEDALIS, Faculté de Pharmacie, 74 route du Rhin, 67412 Illkirch, France
| | - Eric Trinquet
- Cisbio Bioassays,
Parc Marcel Boiteux, BP84175, 30200 Codolet, France
| | - Marcel Hibert
- Laboratoire d’Innovation
Thérapeutique, UMR7200 CNRS/Université de Strasbourg,
Labex MEDALIS, Faculté de Pharmacie, 74 route du Rhin, 67412 Illkirch, France
| | - Jean-Philippe Pin
- CNRS UMR 5203, and INSERM U661, and Université Montpellier I et II, Institut de Génomique Fonctionnelle, Département de Pharmacologie Moléculaire, 141 rue de la Cardonille, 34094 Montpellier Cedex 5, France
| | - Dominique Bonnet
- Laboratoire d’Innovation
Thérapeutique, UMR7200 CNRS/Université de Strasbourg,
Labex MEDALIS, Faculté de Pharmacie, 74 route du Rhin, 67412 Illkirch, France
| | - Thierry Durroux
- CNRS UMR 5203, and INSERM U661, and Université Montpellier I et II, Institut de Génomique Fonctionnelle, Département de Pharmacologie Moléculaire, 141 rue de la Cardonille, 34094 Montpellier Cedex 5, France
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19
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Karpenko IA, Margathe JF, Rodriguez T, Pflimlin E, Dupuis E, Hibert M, Durroux T, Bonnet D. Selective Nonpeptidic Fluorescent Ligands for Oxytocin Receptor: Design, Synthesis, and Application to Time-Resolved FRET Binding Assay. J Med Chem 2015; 58:2547-52. [DOI: 10.1021/jm501395b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Iuliia A. Karpenko
- Laboratoire
d’Innovation Thérapeutique, UMR7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74 route
du Rhin, 67401 Illkirch, France
| | - Jean-François Margathe
- Laboratoire
d’Innovation Thérapeutique, UMR7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74 route
du Rhin, 67401 Illkirch, France
| | - Thiéric Rodriguez
- Institut
de Génomique Fonctionnelle, Département de Pharmacologie
Moléculaire, CNRS UMR 5203, INSERM U1191, Université de Montpellier, 141 rue de la Cardonille, 34094 Montpellier Cedex 5, France
| | - Elsa Pflimlin
- Laboratoire
d’Innovation Thérapeutique, UMR7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74 route
du Rhin, 67401 Illkirch, France
| | - Elodie Dupuis
- Cisbio Bioassays, Parc Marcel
Boiteux, 30200 Codolet, France
| | - Marcel Hibert
- Laboratoire
d’Innovation Thérapeutique, UMR7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74 route
du Rhin, 67401 Illkirch, France
| | - Thierry Durroux
- Institut
de Génomique Fonctionnelle, Département de Pharmacologie
Moléculaire, CNRS UMR 5203, INSERM U1191, Université de Montpellier, 141 rue de la Cardonille, 34094 Montpellier Cedex 5, France
| | - Dominique Bonnet
- Laboratoire
d’Innovation Thérapeutique, UMR7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74 route
du Rhin, 67401 Illkirch, France
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20
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Oueslati N, Hounsou C, Belhocine A, Rodriguez T, Dupuis E, Zwier JM, Trinquet E, Pin JP, Durroux T. Time-resolved FRET strategy to screen GPCR ligand library. Methods Mol Biol 2015; 1272:23-36. [PMID: 25563174 DOI: 10.1007/978-1-4939-2336-6_2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Screening chemical libraries to find specific drugs for G protein-coupled receptors is still of major interest. Indeed, because of their major roles in all physiological functions, G protein-coupled receptors remain major targets for drug development programs. Currently, interest in GPCRs as drug targets has been boosted by the discovery of biased ligands, thus allowing the development of drugs not only specific for one target but also for the specific signaling cascade expected to have the therapeutic effect. Such molecules are then expected to display fewer side effects. To reach such a goal, there is much interest in novel, efficient, simple, and direct screening assays that may help identify any drugs interacting with the target, these being then analyzed for their biased activity. Here, we present an efficient strategy to screen ligands on their binding properties. The method described is based on time-resolved FRET between a receptor and a ligand. This method has already been used to develop new assays called Tag-lite(®) binding assays for numerous G protein-coupled receptors, proving its broad application and its power.
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Affiliation(s)
- Nadia Oueslati
- Institut de Génomique Fonctionnelle, CNRS, UMR 5203, 141 Rue de la Cardonille, 34094, Montpellier Cedex 5, France
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21
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Balasuriya D, D'Sa L, Talker R, Dupuis E, Maurin F, Martin P, Borgese F, Soriani O, Edwardson JM. A direct interaction between the sigma-1 receptor and the hERG voltage-gated K+ channel revealed by atomic force microscopy and homogeneous time-resolved fluorescence (HTRF®). J Biol Chem 2014; 289:32353-32363. [PMID: 25266722 PMCID: PMC4231707 DOI: 10.1074/jbc.m114.603506] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [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: 08/07/2014] [Revised: 09/17/2014] [Indexed: 01/29/2023] Open
Abstract
The sigma-1 receptor is an endoplasmic reticulum chaperone protein, widely expressed in central and peripheral tissues, which can translocate to the plasma membrane and modulate the function of various ion channels. The human ether-à-go-go-related gene encodes hERG, a cardiac voltage-gated K(+) channel that is abnormally expressed in many human cancers and is known to interact functionally with the sigma-1 receptor. Our aim was to investigate the nature of the interaction between the sigma-1 receptor and hERG. We show that the two proteins can be co-isolated from a detergent extract of stably transfected HEK-293 cells, consistent with a direct interaction between them. Atomic force microscopy imaging of the isolated protein confirmed the direct binding of the sigma-1 receptor to hERG monomers, dimers, and tetramers. hERG dimers and tetramers became both singly and doubly decorated by sigma-1 receptors; however, hERG monomers were only singly decorated. The distribution of angles between pairs of sigma-1 receptors bound to hERG tetramers had two peaks, at ∼90 and ∼180° in a ratio of ∼2:1, indicating that the sigma-1 receptor interacts with hERG with 4-fold symmetry. Homogeneous time-resolved fluorescence (HTRF®) allowed the detection of the interaction between the sigma-1 receptor and hERG within the plane of the plasma membrane. This interaction was resistant to sigma ligands, but was decreased in response to cholesterol depletion of the membrane. We suggest that the sigma-1 receptor may bind to hERG in the endoplasmic reticulum, aiding its assembly and trafficking to the plasma membrane.
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Affiliation(s)
- Dilshan Balasuriya
- Department of Pharmacology, University of Cambridge, Cambridge CB2 1PD, United Kingdom
| | - Lauren D'Sa
- Department of Pharmacology, University of Cambridge, Cambridge CB2 1PD, United Kingdom
| | - Ronel Talker
- Department of Pharmacology, University of Cambridge, Cambridge CB2 1PD, United Kingdom
| | - Elodie Dupuis
- CisBio Bioassays, Parc Marcel Boiteux BP 84175, 30200 Codolet, France, and
| | - Fabrice Maurin
- CisBio Bioassays, Parc Marcel Boiteux BP 84175, 30200 Codolet, France, and
| | - Patrick Martin
- Institut de Biologie de Valrose (iBV), CNRS UMR 7277, INSERM U1091 UNS, Faculté des Sciences, Université de Nice Sophia Antipolis, 06108 Nice Cedex 2, France
| | - Franck Borgese
- Institut de Biologie de Valrose (iBV), CNRS UMR 7277, INSERM U1091 UNS, Faculté des Sciences, Université de Nice Sophia Antipolis, 06108 Nice Cedex 2, France
| | - Olivier Soriani
- Institut de Biologie de Valrose (iBV), CNRS UMR 7277, INSERM U1091 UNS, Faculté des Sciences, Université de Nice Sophia Antipolis, 06108 Nice Cedex 2, France.
| | - J Michael Edwardson
- Department of Pharmacology, University of Cambridge, Cambridge CB2 1PD, United Kingdom,.
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Bonnet A, Casqueveaux V, Clerfeuille A, Coulombez C, Dupuis E, Gaillard A, Letheux C, Obadia G, Rabret E, Rat De Cocquard M. Favoriser une prise en charge cohérente des aides à domicile par l’utilisation des fiches médico-professionnelles. ARCH MAL PROF ENVIRO 2014. [DOI: 10.1016/j.admp.2014.03.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Seither O, Dupuis E, Fontaine B, Langlois E. Un cancérogène néoformé dans un produit apparemment banal. ARCH MAL PROF ENVIRO 2013. [DOI: 10.1016/j.admp.2013.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Coentrao L, Ribeiro C, Santos-Araujo C, Neto R, Pestana M, Rahman E, Rahman H, Ahmed D, Mousa D, El Bishlawi M, Shibahara H, Shibahara N, Takahashi S, Dupuis E, Duval X, Dornic Q, Bonnal C, Lucet JC, Cerceau O, Randoux C, Balde C, Besson F, Mentre F, Vrtovsnik F, Koutroubas G, Malindretos P, Zagotsis G, Makri P, Syrganis C, Mambelli E, Mancini E, Elia C, Guadagno V, Facchini MG, Zucchelli A, Grazia M, Patregnani L, Santoro A, Stefan G, Stefan G, Stancu S, Capusa C, Ailioaiei OR, Mircescu G, Anwar S, Little C, Kingston R, Diwakar P, Kaikini R, Syrganis C, Koutroubas G, Zagotsis G, Malindretos P, Makri P, Nikolaou E, Loukas G, Sabry A, Alsaran K, Al Sherbeiny S, Abdulkader M, Kwak I, Song S, Seong E, Lee S, Lee D, Kim I, Rhee H, Silva F, Queiros J, Malheiro J, Cabrita A, Rocha A, Bamidis P, Bamidis P, Liaskos C, Chryssogonidis I, Frantzidis C, Papagiannis A, Vrochides D, Lasaridis A, Nikolaidis P, Malindretos P, Kotwal S, Muir C, Hawley C, Snelling P, Gallagher M, Jardine M, Shibata K, Shibata K, Toya Y, Umemura S, Iwamoto T, Ono S, Ikeda E, Kitazawa A, Kuji T, Koguchi N, Satta H, Nishihara M, Kawata S, Kaneda T, Yamada Y, Murakami T, Yanagi M, Yasuda G, Mathieu S, Yves D, Jean-Michel T, Nicolas Q, Jean-Francois C, Ibrahim M, Abdel Salam M, Awadalla A, Bichari W, Zaki S, Roca-Tey R, Samon R, Ibrik O, Roda A, Gonzalez-Oliva JC, Martinez-Cercos R, Viladoms J, Lin CC, Yang WC, Kim YO, Yoon SA, Yun YS, Song HC, Kim BS, Cheong MA, Ogawa T, Kiba T, Okazaki S, Hatano M, Iwanaga M, Noiri C, Matsuda A, Hasegawa H, Mitarai T, DI Napoli A, DI Lallo D, Tazza L, De Cicco C, Salvatori MF, Chicca S, Guasticchi G, Gelev S, Trajceska L, Srbinovska E, Pavleska S, Oncevski A, Dejanov P, Gerasomovska V, Selim G, Sikole A, Wilson S, Mayne T, Krishnan M, Holland J, Volz A, Good L, Nissenson A, Stavroulopoulos A, Aresti V, Maragkakis G, Kyriakides S, Rikker C, Rikker C, Juhasz E, Tornoci L, Tovarosi S, Greguschik J, Mag O, Rosivall L, Golebiowski T, Golebiowski T, Watorek E, Kusztal M, Letachowicz K, Letachowicz W, Madziarska K, Augustyniak Bartosik H, Krajewska M, Weyde W, Klinger M, Capitanini A, Lange S, Cupisti A, Schier T, Gobel G, Bosmuller C, Gruber I, Tiefenthaler M, Shipley T, Adam J, Sweeney D, Fenwick S, Mansy H, Ahmed S, Moore I, Iwamoto T, Shibata K, Yasuda G, Kaneda T, Murakami T, Kuji T, Koguchi N, Satta H, Nishihara M, Kawata S, Yanagi M, Yamada Y, Ono S, Ikeda E, Kitazawa A, Toya Y, Umemura S, Vigeral P, Saksi S, Flamant M, Boulanger H, Kim YO, Yoon SA, Yun YS, Song HC, Kim BS, Park WD, Cheong MA, Nikam M, Tavakoli A, Chemla E, Evans J, Malete H, Matyas L, Mogan I, Lazarides M, Ebner A, Shi Y, Shi Y, Zhang J, Cheng J, Frank LR, Melanie H, Dominique B, Michel G, Ikeda K, Yasuda T, Yotueda H, Nikam M, Ebah L, Jayanti A, Evans J, Kanigicherla D, Summers A, Manley G, Dutton G, Chalmers N, Mitra S, Checherita IA, Niculae A, Radulescu D, David C, Turcu FL, Ciocalteu A, Persic V, Persic V, Buturovic-Ponikvar J, Ponikvar R, Touam M, Touam M, Menoyo V, Drueke T, Rifaat M, Muresan C, Abtahi M, Koochakipour Z, Joly D, Baharani J, Rizvi S, Ng KP, Buzzi L, Sarcina C, Alberghini E, Ferrario F, Baragetti I, Santagostino G, Furiani S, Corghi E, Sarcina C, Terraneo V, Rastelli F, Bacchini G, Pozzi C, Adorati Menegato M, Mortellaro R, Locicero A, Romano A, Manzini PP, Steckiph D, Shintaku S, Kawanishi H, Moriishi M, Bansyodani M, Nakamura S, Saito M, Tsuchiya S, Barros F, Vaz R, Carvalho B, Neto R, Martins P, Pestana M, Likaj E, Likaj E, Seferi S, Rroji M, Idrizi A, Duraku A, Barbullushi M, Thereska N, Shintaku S, Kawanishi H, Moriishi M, Bansyodani M, Nakamura S, Saito M, Tsuchiya S. Vascular access. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Fuzier R, Maguès JP, Dupuis E, Pomiès S, Segui S, Sénard JM. [Proton pump inhibitors: impact of professional practice evaluation on prescriptions pertinence]. ACTA ACUST UNITED AC 2011; 30:814-8. [PMID: 21981846 DOI: 10.1016/j.annfar.2011.07.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 11/16/2010] [Accepted: 07/19/2011] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To improve the quality of proton pump inhibitors (PPI) prescription in an orthopaedic department. STUDY DESIGN Prospective professional practice evaluation study. PATIENTS AND METHODS A specific protocol concerning the best practice for using PPI in the perioperative period was established by anaesthesiologists and validated by all prescribers, according to recent recommendations published by French Afssaps. PPI prescription pertinence, mainly using the oral route, was based upon the presence of clearly identified risk factors. PPI mensual consumption and severe gastric complications were analyzed and compared with those obtained from the previous year. Ten months after the beginning of the protocol, the pertinence of PPI prescription was analyzed in 20 randomly selected medical records. Data are expressed in defined daily dose (DDD). RESULTS After one year, a 35.5% decrease in oral PPI consumption was noted (901 ± 211 before vs 581 ± 235 DDD, after, P<0.05). A similar trend to a decrease in intravenous PPI consumption was observed (40 ± 23 vs 22 ± 26, P=0.06). During the same period, the overall incidence of severe gastric complication remained stable. The PPI prescription was pertinent in 85% of selected medical records. CONCLUSION This study confirmed the interest of professional practice evaluation protocols to improve PPI prescription. A strong implication of all medical staff members is mandatory to maintain such benefits over time.
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Affiliation(s)
- R Fuzier
- Service orthopédie, pôle anesthésie-réanimation, faculté de médecine, CHU Purpan, université Toulouse-III, place Dr.-Baylac, TSA40031, 31059 Toulouse cedex 9, France.
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Dupuis E, Duval X, Dornic Q, Bonnal C, Lucet JC, Cerceau O, Randoux C, Balde C, Besson F, Mentre F, Vrtovsnik F. Solution de verrouillage des cathéters tunnelisés au citrate concentré : pas de bénéfice sur les bactériémies liées au cathéter ? Nephrol Ther 2011. [DOI: 10.1016/j.nephro.2011.07.141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Fuzier R, Magues JP, Richez AS, Dupuis E, Bellon B, Senard JM, Cauhepe C, Malleterre R. 065 Assessing the use of proton pump inhibitors in a surgical unit. BMJ Qual Saf 2010. [DOI: 10.1136/qshc.2010.041632.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Bureau C, Metivier S, Peron JM, Selves J, Robic MA, Gourraud PA, Rouquet O, Dupuis E, Alric L, Vinel JP. Transient elastography accurately predicts presence of significant portal hypertension in patients with chronic liver disease. Aliment Pharmacol Ther 2008; 27:1261-8. [PMID: 18397389 DOI: 10.1111/j.1365-2036.2008.03701.x] [Citation(s) in RCA: 260] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Hepatic venous pressure gradient (HVPG) is a prognostic marker in patients with cirrhosis. Transient elastography measures liver stiffness (LS). AIM To assess the correlation between LS and HVPG and to investigate the performance of transient elastography for the diagnosis of significant portal hypertension (PHT). METHODS Liver stiffness was measured by Fibroscan in 150 consecutive patients who underwent a liver biopsy with haemodynamic measurements. Usual clinical and biological data were collected. Significant PHT was defined as a HVPG > or = 10 mmHg. RESULTS Hepatic venous pressure gradient was found to be > or = 10 mmHg in 76 patients. Cirrhosis was diagnosed in 89 patients. HVPG was found to be correlated with: LS (rho = 0.858; P < 0.001) and inversely correlated with prothrombin index (rho = -0.718; P < 0.001). Regarding significant PHT, AUROC for LS and prothrombin index were 0.945 [0.904-0.987] and 0.892 [0.837-0.947] respectively. The cut-off value of 21 kPa accurately predicted significant PHT in 92% of the 144 patients for whom LS was successful. CONCLUSION Liver stiffness measurement is correlated with HVPG and transient elastography identifies patients with significant PHT.
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Affiliation(s)
- C Bureau
- Service d'Hépato-Gastro-Entérologie, Fédération Digestive, Purpan, CHU, Toulouse, France.
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Péron JM, Bureau C, Poirson H, Mansuy JM, Alric L, Selves J, Dupuis E, Izopet J, Vinel JP. Fulminant liver failure from acute autochthonous hepatitis E in France: description of seven patients with acute hepatitis E and encephalopathy. J Viral Hepat 2007; 14:298-303. [PMID: 17439518 DOI: 10.1111/j.1365-2893.2007.00858.x] [Citation(s) in RCA: 176] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Fulminant hepatitis E has not been well characterized in industrialized countries. The aim of this study was to prospectively describe patients with acute hepatitis E presenting as fulminant hepatic failure, i.e. with encephalopathy and prothrombin index <50%. Between February 1997 and April 2005, seven patients with encephalopathy were diagnosed with acute hepatitis E using viral RNA detection. These patients were compared with 33 patients diagnosed with a mild form (absence of encephalopathy) of acute hepatitis E during the same time period. Patients were 65 +/- 11 years old. Five were active drinkers and six had chronic liver disease. All hepatitis E virus sequences evaluated (5/7) were of genotype 3. All patients but two died (71%). Four patients had no travel history. When compared with patients with a mild form of acute hepatitis E, active alcohol abuse and chronic liver disease were more frequent in patients with the severe form. Duration of hospitalization was longer. Aspartate transferase and bilirubin levels were significantly higher. Prothrombin index and accelerin levels were lower and death was more frequent. Acute nontravel-associated hepatitis E can appear as fulminant hepatitis with encephalopathy and coagulation disorders. Prognosis is severe and this may be due to the age at which it occurs and frequent underlying chronic liver disease.
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Affiliation(s)
- J M Péron
- Service d'Hépato-Gastro-Entérologie, CHU Toulouse Hôpital Purpan, Toulouse, France.
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Chamming's F, Chiavassa-Gandois H, Loustau O, Sans N, Dupuis E, Carrère N, Raillhac JJ. [CT-enteroclysis diagnosis of the cause of small-bowel hemorrhage]. J Radiol 2007; 88:689-91. [PMID: 17541364 DOI: 10.1016/s0221-0363(07)89878-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
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Mbou FM, Forler J, Ventose N, Dupuis E, Elana G. Approche épidémiologique du diabète pédiatrique en Martinique. Arch Pediatr 2005; 12:470-1. [PMID: 15808440 DOI: 10.1016/j.arcped.2005.01.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2004] [Accepted: 01/13/2005] [Indexed: 10/25/2022]
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Mbou FM, Martineau L, Eischen A, Elana G, Dupuis E. [Clinical course (ten years) of sickle cell disease in Martinique after neonatal screening]. Arch Pediatr 2004; 11:57-8. [PMID: 14700766 DOI: 10.1016/j.arcped.2003.09.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
Dimethylsulfoxide (DMSO) is a solvent used to dissolve hydrophobic drugs. Recent studies have demonstrated that repeated administration of DMSO induces significant disorders of the peripheral nervous system. To address this issue, we have studied the behavioural effects of repeated intraperitoneal injections of various concentrations of DMSO (1.8-3.6-7.2%) in male Sprague-Dawley rats. Behavioural effects were assessed with a commonly used battery of sensory and motor tests. The motor tests used were actimeter and grip strength test. Sensory test used noxious and non-noxious mechanical (paw pressure test and von Frey hairs test) and thermal (plantar test and tail immersion test) stimuli. Clinical status of the animals was good throughout the experiment and no motor deficits were observed. Nevertheless, sensory assessment displayed a mechanical allodynia of short duration.
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Affiliation(s)
- Nicolas Authier
- EMI INSERM/UdA 9904, Laboratoire de Toxicologie, Faculté de Pharmacie, 28, place Henri Dunant-BP38, 63001 Clermont-Ferrand, France.
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Queffeulou G, Michel C, Vrtovsnik F, Philit JB, Dupuis E, Mignon F. Hyperhomocysteinemia, low folate status, homozygous C677T mutation of the methylene tetrahydrofolate reductase and renal arterial thrombosis. Clin Nephrol 2002; 57:158-62. [PMID: 11863127 DOI: 10.5414/cnp57158] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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: 11/18/2022] Open
Abstract
We report a renal artery thrombosis in a 42-year-old man. Fasting homocysteinemia was at 23 micromol/l 3 months later and at 33 pmol/l 5 months after the vascular event. A homozygous C677T MTHFR was found with low folate status. Active smoking may also have contributed to the pathogenesis of renal arterial thrombosis. The other causes of thrombophilia were ruled out. Homocysteine lowering treament was started: homocysteine normalized at 10.6 micromol/l. There was no recurrence of vascular event within 18 months. We propose mild or moderate hyperhomocysteinemia triggered by low folate status in patients with homozygous C677T MTHFR as a cause of renal arterial thrombosis.
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Affiliation(s)
- G Queffeulou
- Department of Nephrology, CHU Bichat-Claude Bernard, Assistance Publique Hopitaux de Paris, France.
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Péron JM, Dupuis E, Alric L, Ottal P, Rousseau H, Barange K, Payen JL, Pascal JP, Vinel JP. [Treatment by porto-systemic intrahepatic shunt for refractory hydrothorax during cirrhosis]. Gastroenterol Clin Biol 1999; 23:414-5. [PMID: 10384353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
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des Portes V, Pinard JM, Billuart P, Vinet MC, Koulakoff A, Carrié A, Gelot A, Dupuis E, Motte J, Berwald-Netter Y, Catala M, Kahn A, Beldjord C, Chelly J. A novel CNS gene required for neuronal migration and involved in X-linked subcortical laminar heterotopia and lissencephaly syndrome. Cell 1998; 92:51-61. [PMID: 9489699 DOI: 10.1016/s0092-8674(00)80898-3] [Citation(s) in RCA: 523] [Impact Index Per Article: 20.1] [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: 02/06/2023]
Abstract
X-SCLH/LIS syndrome is a neuronal migration disorder with disruption of the six-layered neocortex. It consists of subcortical laminar heterotopia (SCLH, band heterotopia, or double cortex) in females and lissencephaly (LIS) in males, leading to epilepsy and cognitive impairment. We report the characterization of a novel CNS gene encoding a 40 kDa predicted protein that we named Doublecortin and the identification of mutations in four unrelated X-SCLH/LIS cases. The predicted protein shares significant homology with the N-terminal segment of a protein containing a protein kinase domain at its C-terminal part. This novel gene is highly expressed during brain development, mainly in fetal neurons including precursors. The complete disorganization observed in lissencephaly and heterotopia thus seems to reflect a failure of early events associated with neuron dispersion.
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Affiliation(s)
- V des Portes
- INSERM U129-ICGM, Faculté de Médecine Cochin, Paris, France
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Lefaucher C, Dupuis E, Muller J, Laham A. [Torsion of Riedel's lobe. Two cases (author's transl)]. J Chir (Paris) 1978; 115:25-8. [PMID: 632329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The authors report two cases of torsion of Riedel's lobe. The first case resembled acute cholecystitis. Resection was followed by a cure. The second case presented in the form of a complicated abdomino-pelvic tumor. Its removal did not prevent a fatal issue due to fibrinolysis probably related to advanced ischemic infarction of Riedel's lobe of the liver. It seems that these complications are exceptional.
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da Costa CR, Dupont E, Hamers R, Hooghe R, Dupuis E, Potvliege R. Nephrotic syndrome in bronchogenic carcinoma: report of two cases with immunochemical studies. Clin Nephrol 1974; 2:245-51. [PMID: 4614928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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