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Montnach J, Millet H, Persello A, Meudal H, De Waard S, Mesrica P, Ribeiro B, Richard J, Hivonnait A, Tessier A, Lauzier B, Charpentier F, Mangoni ME, Landon C, Jopling C, De Waard M. Optical Control of Cardiac Rhythm by In Vivo Photoactivation of an ERG Channel Peptide Inhibitor. Circ Res 2023; 133:535-538. [PMID: 37593901 PMCID: PMC10467801 DOI: 10.1161/circresaha.123.322880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 08/05/2023] [Indexed: 08/19/2023]
Affiliation(s)
- Jérôme Montnach
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
- Laboratory of Excellence Ion Channels, Science and Therapeutics, Valbonne, France (J.M., H. Millet, S.D.W., P.M., B.R., M.E.M., C.J., M.D.W.)
| | - Hugo Millet
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
- Laboratory of Excellence Ion Channels, Science and Therapeutics, Valbonne, France (J.M., H. Millet, S.D.W., P.M., B.R., M.E.M., C.J., M.D.W.)
| | - Antoine Persello
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
| | - Hervé Meudal
- Center for Molecular Biophysics, CNRS, rue Charles Sadron, Orléans, France (H. Meudal, C.L.)
| | - Stephan De Waard
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
- Laboratory of Excellence Ion Channels, Science and Therapeutics, Valbonne, France (J.M., H. Millet, S.D.W., P.M., B.R., M.E.M., C.J., M.D.W.)
| | - Pietro Mesrica
- Laboratory of Excellence Ion Channels, Science and Therapeutics, Valbonne, France (J.M., H. Millet, S.D.W., P.M., B.R., M.E.M., C.J., M.D.W.)
- Institut de Génomique Fonctionnelle, Université Montpellier, CNRS, INSERM, Montpellier, France (P.M., M.E.M., C.J.)
| | - Barbara Ribeiro
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
- Laboratory of Excellence Ion Channels, Science and Therapeutics, Valbonne, France (J.M., H. Millet, S.D.W., P.M., B.R., M.E.M., C.J., M.D.W.)
| | - Jérémie Richard
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
| | - Agnès Hivonnait
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
| | - Agnès Tessier
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
| | - Benjamin Lauzier
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
| | - Flavien Charpentier
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
| | - Matteo E. Mangoni
- Laboratory of Excellence Ion Channels, Science and Therapeutics, Valbonne, France (J.M., H. Millet, S.D.W., P.M., B.R., M.E.M., C.J., M.D.W.)
- Institut de Génomique Fonctionnelle, Université Montpellier, CNRS, INSERM, Montpellier, France (P.M., M.E.M., C.J.)
| | - Céline Landon
- Center for Molecular Biophysics, CNRS, rue Charles Sadron, Orléans, France (H. Meudal, C.L.)
| | - Chris Jopling
- Laboratory of Excellence Ion Channels, Science and Therapeutics, Valbonne, France (J.M., H. Millet, S.D.W., P.M., B.R., M.E.M., C.J., M.D.W.)
- Institut de Génomique Fonctionnelle, Université Montpellier, CNRS, INSERM, Montpellier, France (P.M., M.E.M., C.J.)
| | - Michel De Waard
- Nantes Université, CNRS, INSERM, l’institut du thorax, Nantes, France (J.M., H. Millet, A.P., S.D.W., B.R., J.R., A.H., A.T., B.L., F.C., M.D.W.)
- Laboratory of Excellence Ion Channels, Science and Therapeutics, Valbonne, France (J.M., H. Millet, S.D.W., P.M., B.R., M.E.M., C.J., M.D.W.)
- Smartox Biotechnology, Saint-Egrève, France (M.D.W.)
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Lopez L, De Waard S, Meudal H, Caumes C, Khakh K, Peigneur S, Oliveira-Mendes B, Lin S, De Waele J, Montnach J, Cestèle S, Tessier A, Johnson JP, Mantegazza M, Tytgat J, Cohen C, Béroud R, Bosmans F, Landon C, De Waard M. Structure-function relationship of new peptides activating human Na v1.1. Biomed Pharmacother 2023; 165:115173. [PMID: 37453200 DOI: 10.1016/j.biopha.2023.115173] [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: 03/23/2023] [Revised: 07/11/2023] [Accepted: 07/12/2023] [Indexed: 07/18/2023] Open
Abstract
Nav1.1 is an important pharmacological target as this voltage-gated sodium channel is involved in neurological and cardiac syndromes. Channel activators are actively sought to try to compensate for haploinsufficiency in several of these pathologies. Herein we used a natural source of new peptide compounds active on ion channels and screened for drugs capable to inhibit channel inactivation as a way to compensate for decreased channel function. We discovered that JzTx-34 is highly active on Nav1.1 and subsequently performed a full structure-activity relationship investigation to identify its pharmacophore. These experiments will help interpret the mechanism of action of this and formerly identified peptides as well as the future identification of new peptides. We also reveal structural determinants that make natural ICK peptides active against Nav1.1 challenging to synthesize. Altogether, the knowledge gained by this study will help facilitate the discovery and development of new compounds active on this critical ion channel target.
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Affiliation(s)
- Ludivine Lopez
- Nantes Université, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France; Smartox Biotechnology, Saint-Egrève, France
| | - Stephan De Waard
- Nantes Université, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France; LabEx "Ion Channels, Science and Therapeutics", Valbonne, France
| | - Hervé Meudal
- Center for Molecular Biophysics, CNRS, rue Charles Sadron, CS 80054, Orléans 45071, France
| | | | - Kuldip Khakh
- Xenon Pharmaceuticals, Burnaby, British Columbia, Canada
| | | | | | - Sophia Lin
- Xenon Pharmaceuticals, Burnaby, British Columbia, Canada
| | - Jolien De Waele
- Department of Basic and Applied Medical Sciences, Ghent University, Ghent, Belgium
| | - Jérôme Montnach
- Nantes Université, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Sandrine Cestèle
- Université Cote d'Azur, CNRS UMR 7275, Institute of Molecular and Cellular Pharmacology, Valbonne-Sophia Antipolis, France
| | - Agnès Tessier
- Nantes Université, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - J P Johnson
- Xenon Pharmaceuticals, Burnaby, British Columbia, Canada
| | - Massimo Mantegazza
- Université Cote d'Azur, CNRS UMR 7275, Institute of Molecular and Cellular Pharmacology, Valbonne-Sophia Antipolis, France
| | - Jan Tytgat
- University of Leuven, 3000 Leuven, Belgium
| | - Charles Cohen
- Xenon Pharmaceuticals, Burnaby, British Columbia, Canada
| | | | - Frank Bosmans
- Department of Basic and Applied Medical Sciences, Ghent University, Ghent, Belgium
| | - Céline Landon
- Center for Molecular Biophysics, CNRS, rue Charles Sadron, CS 80054, Orléans 45071, France
| | - Michel De Waard
- Nantes Université, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France; Smartox Biotechnology, Saint-Egrève, France; LabEx "Ion Channels, Science and Therapeutics", Valbonne, France.
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3
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Cimarosti B, Canac R, De Waard S, Girardeau A, Gaignerie A, Derevier A, Forest V, Ronjat M, Le Marec H, Gourraud JB, Lemarchand P, De Waard M, Lamirault G, Gaborit N. Generation of human induced pluripotent stem cell lines from three patients affected by Catecholaminergic Polymorphic ventricular tachycardia (CPVT) carrying heterozygous mutations in RYR2 gene. Stem Cell Res 2022; 60:102688. [DOI: 10.1016/j.scr.2022.102688] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/18/2022] [Accepted: 01/23/2022] [Indexed: 10/19/2022] Open
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Montnach J, De Waard S, Nicolas S, Burel S, Osorio N, Zoukimian C, Mantegazza M, Boukaiba R, Béroud R, Partiseti M, Delmas P, Marionneau C, De Waard M. Fluorescent- and tagged-protoxin II peptides: potent markers of the Na v 1.7 channel pain target. Br J Pharmacol 2021; 178:2632-2650. [PMID: 33742442 DOI: 10.1111/bph.15453] [Citation(s) in RCA: 2] [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: 09/23/2019] [Revised: 01/26/2021] [Accepted: 02/09/2021] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND AND PURPOSE Protoxin II (ProTx II) is a high affinity gating modifier that is thought to selectively block the Nav 1.7 voltage-dependent Na+ channel, a major therapeutic target for the control of pain. We aimed at producing ProTx II analogues entitled with novel functionalities for cell distribution studies and biochemical characterization of its Nav channel targets. EXPERIMENTAL APPROACH We took advantage of the high affinity properties of the peptide, combined to its slow off rate, to design a number of new tagged analogues useful for imaging and biochemistry purposes. We used high-throughput automated patch-clamp to identify the analogues best matching the native properties of ProTx II and validated them on various Nav -expressing cells in pull-down and cell distribution studies. KEY RESULTS Two of the produced ProTx II analogues, Biot-ProTx II and ATTO488-ProTx II, best emulate the pharmacological properties of unlabelled ProTx II, whereas other analogues remain high affinity blockers of Nav 1.7. The biotinylated version of ProTx II efficiently works for the pull-down of several Nav isoforms tested in a concentration-dependent manner, whereas the fluorescent ATTO488-ProTx II specifically labels the Nav 1.7 channel over other Nav isoforms tested in various experimental conditions. CONCLUSIONS AND IMPLICATIONS The properties of these ProTx II analogues as tools for Nav channel purification and cell distribution studies pave the way for a better understanding of ProTx II channel receptors in pain and their pathophysiological implications in sensory neuronal processing. The new fluorescent ProTx II should also be useful in the design of new drug screening strategies.
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Affiliation(s)
- Jérôme Montnach
- LabEx "Ion Channels, Science & Therapeutics", l'institut du thorax, INSERM, CNRS, UNIV NANTES, Nantes, France
| | - Stephan De Waard
- LabEx "Ion Channels, Science & Therapeutics", l'institut du thorax, INSERM, CNRS, UNIV NANTES, Nantes, France
| | - Sébastien Nicolas
- LabEx "Ion Channels, Science & Therapeutics", l'institut du thorax, INSERM, CNRS, UNIV NANTES, Nantes, France
| | - Sophie Burel
- LabEx "Ion Channels, Science & Therapeutics", l'institut du thorax, INSERM, CNRS, UNIV NANTES, Nantes, France
| | - Nancy Osorio
- Laboratory of Cognitive Neuroscience, UMR 7291, CNRS, Aix-Marseille University, Marseille, France
| | | | - Massimo Mantegazza
- Université Cote d'Azur, CNRS UMR 7275, Institute of Molecular and Cellular Pharmacology, Valbonne-Sophia Antipolis, France
| | - Rachid Boukaiba
- Sanofi R&D, Integrated Drug Discovery - High Content Biology, Vitry-sur-Seine, France
| | | | - Michel Partiseti
- Sanofi R&D, Integrated Drug Discovery - High Content Biology, Vitry-sur-Seine, France
| | - Patrick Delmas
- Laboratory of Cognitive Neuroscience, UMR 7291, CNRS, Aix-Marseille University, Marseille, France
| | - Céline Marionneau
- LabEx "Ion Channels, Science & Therapeutics", l'institut du thorax, INSERM, CNRS, UNIV NANTES, Nantes, France
| | - Michel De Waard
- LabEx "Ion Channels, Science & Therapeutics", l'institut du thorax, INSERM, CNRS, UNIV NANTES, Nantes, France.,Smartox Biotechnology, Saint-Egrève, France
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5
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De Waard S, Montnach J, Ribeiro B, Nicolas S, Forest V, Charpentier F, Mangoni ME, Gaborit N, Ronjat M, Loussouarn G, Lemarchand P, De Waard M. Functional Impact of BeKm-1, a High-Affinity hERG Blocker, on Cardiomyocytes Derived from Human-Induced Pluripotent Stem Cells. Int J Mol Sci 2020; 21:ijms21197167. [PMID: 32998413 PMCID: PMC7582727 DOI: 10.3390/ijms21197167] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 09/21/2020] [Accepted: 09/24/2020] [Indexed: 12/22/2022] Open
Abstract
IKr current, a major component of cardiac repolarization, is mediated by human Ether-à-go-go-Related Gene (hERG, Kv11.1) potassium channels. The blockage of these channels by pharmacological compounds is associated to drug-induced long QT syndrome (LQTS), which is a life-threatening disorder characterized by ventricular arrhythmias and defects in cardiac repolarization that can be illustrated using cardiomyocytes derived from human-induced pluripotent stem cells (hiPS-CMs). This study was meant to assess the modification in hiPS-CMs excitability and contractile properties by BeKm-1, a natural scorpion venom peptide that selectively interacts with the extracellular face of hERG, by opposition to reference compounds that act onto the intracellular face. Using an automated patch-clamp system, we compared the affinity of BeKm-1 for hERG channels with some reference compounds. We fully assessed its effects on the electrophysiological, calcium handling, and beating properties of hiPS-CMs. By delaying cardiomyocyte repolarization, the peptide induces early afterdepolarizations and reduces spontaneous action potentials, calcium transients, and contraction frequencies, therefore recapitulating several of the critical phenotype features associated with arrhythmic risk in drug-induced LQTS. BeKm-1 exemplifies an interesting reference compound in the integrated hiPS-CMs cell model for all drugs that may block the hERG channel from the outer face. Being a peptide that is easily modifiable, it will serve as an ideal molecular platform for the design of new hERG modulators displaying additional functionalities.
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Affiliation(s)
- Stephan De Waard
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
- LabEx Ion Channels, Science & Therapeutics, F-06560 Valbonne, France;
| | - Jérôme Montnach
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
| | - Barbara Ribeiro
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
| | - Sébastien Nicolas
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
| | - Virginie Forest
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
| | - Flavien Charpentier
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
| | - Matteo Elia Mangoni
- LabEx Ion Channels, Science & Therapeutics, F-06560 Valbonne, France;
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Université de Montpellier, F34094 Montpellier, France
| | - Nathalie Gaborit
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
| | - Michel Ronjat
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
- LabEx Ion Channels, Science & Therapeutics, F-06560 Valbonne, France;
| | - Gildas Loussouarn
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
| | - Patricia Lemarchand
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
| | - Michel De Waard
- L’institut du thorax, INSERM, CNRS, Université de Nantes, F-44007 Nantes, France; (S.D.W.); (J.M.); (B.R.); (S.N.); (V.F.); (F.C.); (N.G.); (M.R.); (G.L.); (P.L.)
- LabEx Ion Channels, Science & Therapeutics, F-06560 Valbonne, France;
- Smartox Biotechnology, 6 rue des Platanes, F-38120 Saint-Egrève, France
- Correspondence: ; Tel.: +33-228-080-076
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6
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Nicolas S, Zoukimian C, Bosmans F, Montnach J, Diochot S, Cuypers E, De Waard S, Béroud R, Mebs D, Craik D, Boturyn D, Lazdunski M, Tytgat J, De Waard M. Chemical Synthesis, Proper Folding, Na v Channel Selectivity Profile and Analgesic Properties of the Spider Peptide Phlotoxin 1. Toxins (Basel) 2019; 11:toxins11060367. [PMID: 31234412 PMCID: PMC6628435 DOI: 10.3390/toxins11060367] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 06/11/2019] [Accepted: 06/16/2019] [Indexed: 12/19/2022] Open
Abstract
Phlotoxin-1 (PhlTx1) is a peptide previously identified in tarantula venom (Phlogius species) that belongs to the inhibitory cysteine-knot (ICK) toxin family. Like many ICK-based spider toxins, the synthesis of PhlTx1 appears particularly challenging, mostly for obtaining appropriate folding and concomitant suitable disulfide bridge formation. Herein, we describe a procedure for the chemical synthesis and the directed sequential disulfide bridge formation of PhlTx1 that allows for a straightforward production of this challenging peptide. We also performed extensive functional testing of PhlTx1 on 31 ion channel types and identified the voltage-gated sodium (Nav) channel Nav1.7 as the main target of this toxin. Moreover, we compared PhlTx1 activity to 10 other spider toxin activities on an automated patch-clamp system with Chinese Hamster Ovary (CHO) cells expressing human Nav1.7. Performing these analyses in reproducible conditions allowed for classification according to the potency of the best natural Nav1.7 peptide blockers. Finally, subsequent in vivo testing revealed that intrathecal injection of PhlTx1 reduces the response of mice to formalin in both the acute pain and inflammation phase without signs of neurotoxicity. PhlTx1 is thus an interesting toxin to investigate Nav1.7 involvement in cellular excitability and pain.
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Affiliation(s)
- Sébastien Nicolas
- Institut du Thorax, Inserm UMR 1087/CNRS UMR 6291, LabEx "Ion Channels, Science & Therapeutics", F-44007 Nantes, France.
| | - Claude Zoukimian
- Smartox Biotechnology, 6 rue des Platanes, F-38120 Saint-Egrève, France.
- Department of Molecular Chemistry, Univ. Grenoble Alpes, CNRS, 570 rue de la chimie, CS 40700, 38000 Grenoble, France.
| | - Frank Bosmans
- Faculty of Medicine and Health Sciences, Department of Basic and Applied Medical Sciences, 9000 Gent, Belgium.
- Toxicology and Pharmacology, University of Leuven, Campus Gasthuisberg, P.O. Box 922, Herestraat 49, 3000 Leuven, Belgium.
| | - Jérôme Montnach
- Institut du Thorax, Inserm UMR 1087/CNRS UMR 6291, LabEx "Ion Channels, Science & Therapeutics", F-44007 Nantes, France.
| | - Sylvie Diochot
- Université Côte d'Azur, CNRS UMR7275, Institut de Pharmacologie Moléculaire et Cellulaire, 660 route des lucioles, 6560 Valbonne, France.
| | - Eva Cuypers
- Toxicology and Pharmacology, University of Leuven, Campus Gasthuisberg, P.O. Box 922, Herestraat 49, 3000 Leuven, Belgium.
| | - Stephan De Waard
- Institut du Thorax, Inserm UMR 1087/CNRS UMR 6291, LabEx "Ion Channels, Science & Therapeutics", F-44007 Nantes, France.
| | - Rémy Béroud
- Smartox Biotechnology, 6 rue des Platanes, F-38120 Saint-Egrève, France.
| | - Dietrich Mebs
- Institute of Legal Medicine, University of Frankfurt, Kennedyallee 104, Frankfurt, Germany.
| | - David Craik
- Institute for Molecular Bioscience, University of Queensland, Brisbane 4072, Australia.
| | - Didier Boturyn
- Department of Molecular Chemistry, Univ. Grenoble Alpes, CNRS, 570 rue de la chimie, CS 40700, 38000 Grenoble, France.
| | - Michel Lazdunski
- Université Côte d'Azur, CNRS UMR7275, Institut de Pharmacologie Moléculaire et Cellulaire, 660 route des lucioles, 6560 Valbonne, France.
| | - Jan Tytgat
- Toxicology and Pharmacology, University of Leuven, Campus Gasthuisberg, P.O. Box 922, Herestraat 49, 3000 Leuven, Belgium.
| | - Michel De Waard
- Institut du Thorax, Inserm UMR 1087/CNRS UMR 6291, LabEx "Ion Channels, Science & Therapeutics", F-44007 Nantes, France.
- Smartox Biotechnology, 6 rue des Platanes, F-38120 Saint-Egrève, France.
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7
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Zoukimian C, Meudal H, De Waard S, Ouares KA, Nicolas S, Canepari M, Béroud R, Landon C, De Waard M, Boturyn D. Synthesis by native chemical ligation and characterization of the scorpion toxin AmmTx3. Bioorg Med Chem 2018; 27:247-253. [PMID: 30529150 DOI: 10.1016/j.bmc.2018.12.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 09/26/2018] [Revised: 11/28/2018] [Accepted: 12/05/2018] [Indexed: 12/27/2022]
Abstract
The scorpion toxin AmmTx3 is a specific blocker of Kv4 channels. It was shown to have interesting potential for neurological disorders. In this study, we report the first chemical synthesis of AmmTx3 by using the native chemical ligation strategy and validate its biological activity. We determined its 3D structure by nuclear magnetic resonance spectroscopy, and pointed out that AmmTx3 possesses the well-known CSαβ structural motif, which is found in a large number of scorpion toxins. Overall, this study establishes an easy synthetic access to biologically active AmmTx3 toxin.
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Affiliation(s)
- Claude Zoukimian
- Department of Molecular Chemistry, Univ. Grenoble Alpes, CNRS, 570 rue de la chimie, CS 40700, Grenoble 38000, France; Smartox Biotechnology, 6 rue des platanes, Saint Egrève 38120, France
| | - Hervé Meudal
- Center for Molecular Biophysics, CNRS, rue Charles Sadron, CS 80054, Orléans 45071, France
| | - Stephan De Waard
- Institut du Thorax, INSERM, CNRS, Univ. Nantes, 8 quai Moncousu, BP 70721, Nantes 44007, France
| | - Karima Ait Ouares
- Laboratory for Interdisciplinary Physics, Univ. Grenoble Alpes, CNRS, 140 Avenue de la Physique, BP 87, Saint-Martin d'Hères 38402, France
| | - Sébastien Nicolas
- Institut du Thorax, INSERM, CNRS, Univ. Nantes, 8 quai Moncousu, BP 70721, Nantes 44007, France
| | - Marco Canepari
- Laboratory for Interdisciplinary Physics, Univ. Grenoble Alpes, CNRS, 140 Avenue de la Physique, BP 87, Saint-Martin d'Hères 38402, France
| | - Rémy Béroud
- Smartox Biotechnology, 6 rue des platanes, Saint Egrève 38120, France
| | - Céline Landon
- Center for Molecular Biophysics, CNRS, rue Charles Sadron, CS 80054, Orléans 45071, France
| | - Michel De Waard
- Institut du Thorax, INSERM, CNRS, Univ. Nantes, 8 quai Moncousu, BP 70721, Nantes 44007, France
| | - Didier Boturyn
- Department of Molecular Chemistry, Univ. Grenoble Alpes, CNRS, 570 rue de la chimie, CS 40700, Grenoble 38000, France.
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Rima M, Daghsni M, De Waard S, Gaborit N, Fajloun Z, Ronjat M, Mori Y, Brusés JL, De Waard M. The β 4 subunit of the voltage-gated calcium channel (Cacnb4) regulates the rate of cell proliferation in Chinese Hamster Ovary cells. Int J Biochem Cell Biol 2017; 89:57-70. [PMID: 28587927 DOI: 10.1016/j.biocel.2017.05.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [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: 03/22/2017] [Revised: 05/20/2017] [Accepted: 05/30/2017] [Indexed: 01/03/2023]
Abstract
The β subunits of Voltage-Gated Calcium Channel (VGCC) are cytosolic proteins that interact with the VGCC pore -forming subunit and participate in the trafficking of the channel to the cell membrane and in ion influx regulation. β subunits also exert functions independently of their binding to VGCC by translocation to the cell nucleus including the control of gene expression. Mutations of the neuronal Cacnb4 (β4) subunit are linked to human neuropsychiatric disorders including epilepsy and intellectual disabilities. It is believed that the pathogenic phenotype induced by these mutations is associated with channel-independent functions of the β4 subunit. In this report, we investigated the role of β4 subunit in cell proliferation and cell cycle progression and examined whether these functions could be altered by a pathogenic mutation. To this end, stably transfected Chinese Hamster Ovary (CHO-K1) cells expressing either rat full-length β4 or the rat C-terminally truncated epileptic mutant variant β1-481 were generated. The subcellular localization of both proteins differed significantly. Full-length β4 localizes almost exclusively in the cell nucleus and concentrates into the nucleolar compartment, while the C-terminal-truncated β1-481 subunit was less concentrated within the nucleus and absent from the nucleoli. Cell proliferation was found to be reduced by the expression of β4, while it was unaffected by the epileptic mutant. Also, full-length β4 interfered with cell cycle progression by presumably preventing cells from entering the S-phase via a mechanism that partially involves endogenous B56δ, a regulatory subunit of the phosphatase 2A (PP2A) that binds β4 but not β1-481. Analysis of β4 subcellular distribution during the cell cycle revealed that the protein is highly expressed in the nucleus at the G1/S transition phase and that it is translocated out of the nucleus during chromatin condensation and cell division. These results suggest that nuclear accumulation of β4 at the G1/S transition phase affects the progression into S-phase resulting in a decrease in the rate of cell proliferation. Regulation of the cell cycle exit is a critical step in determining the number of neuronal precursors and neuronal differentiation suggesting that mutations of the β4 subunit could affect neural development and formation of the mature central nervous system.
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Affiliation(s)
- Mohamad Rima
- INSERM UMR1087, LabEx Ion Channels Science and Therapeutics, Institut du Thorax, Nantes, F-44000 France; CNRS, UMR6291, Nantes, F-44000 France; Azm Center for Research in Biotechnology and its Application, Lebanese University, 1300, Tripoli, Lebanon
| | - Marwa Daghsni
- INSERM UMR1087, LabEx Ion Channels Science and Therapeutics, Institut du Thorax, Nantes, F-44000 France; CNRS, UMR6291, Nantes, F-44000 France; Université de Tunis El Manar, Faculté de Médecine de Tunis, LR99ES10 Laboratoire de Génétique Humaine, 1007, Tunis, Tunisia
| | - Stephan De Waard
- INSERM UMR1087, LabEx Ion Channels Science and Therapeutics, Institut du Thorax, Nantes, F-44000 France; CNRS, UMR6291, Nantes, F-44000 France; Université de Nantes, Nantes, F-44000 France
| | - Nathalie Gaborit
- INSERM UMR1087, LabEx Ion Channels Science and Therapeutics, Institut du Thorax, Nantes, F-44000 France; CNRS, UMR6291, Nantes, F-44000 France; Université de Nantes, Nantes, F-44000 France
| | - Ziad Fajloun
- Azm Center for Research in Biotechnology and its Application, Lebanese University, 1300, Tripoli, Lebanon; Faculty of Sciences III, Lebanese University, 1300, Tripoli, Lebanon
| | - Michel Ronjat
- INSERM UMR1087, LabEx Ion Channels Science and Therapeutics, Institut du Thorax, Nantes, F-44000 France; CNRS, UMR6291, Nantes, F-44000 France; Université de Nantes, Nantes, F-44000 France
| | - Yasuo Mori
- Laboratory of Molecular Biology, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Juan L Brusés
- Department of Natural Sciences, Mercy College, Dobbs Ferry, NY 10522, USA
| | - Michel De Waard
- INSERM UMR1087, LabEx Ion Channels Science and Therapeutics, Institut du Thorax, Nantes, F-44000 France; CNRS, UMR6291, Nantes, F-44000 France; Université de Nantes, Nantes, F-44000 France.
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