1
|
Oliveira-Mendes BBR, Alameh M, Ollivier B, Montnach J, Bidère N, Souazé F, Escriou N, Charpentier F, Baró I, De Waard M, Loussouarn G. SARS-CoV-2 E and 3a Proteins Are Inducers of Pannexin Currents. Cells 2023; 12:1474. [PMID: 37296595 PMCID: PMC10252541 DOI: 10.3390/cells12111474] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 05/10/2023] [Accepted: 05/18/2023] [Indexed: 06/12/2023] Open
Abstract
Controversial reports have suggested that SARS-CoV E and 3a proteins are plasma membrane viroporins. Here, we aimed at better characterizing the cellular responses induced by these proteins. First, we show that expression of SARS-CoV-2 E or 3a protein in CHO cells gives rise to cells with newly acquired round shapes that detach from the Petri dish. This suggests that cell death is induced upon expression of E or 3a protein. We confirmed this by using flow cytometry. In adhering cells expressing E or 3a protein, the whole-cell currents were not different from those of the control, suggesting that E and 3a proteins are not plasma membrane viroporins. In contrast, recording the currents on detached cells uncovered outwardly rectifying currents much larger than those observed in the control. We illustrate for the first time that carbenoxolone and probenecid block these outwardly rectifying currents; thus, these currents are most probably conducted by pannexin channels that are activated by cell morphology changes and also potentially by cell death. The truncation of C-terminal PDZ binding motifs reduces the proportion of dying cells but does not prevent these outwardly rectifying currents. This suggests distinct pathways for the induction of these cellular events by the two proteins. We conclude that SARS-CoV-2 E and 3a proteins are not viroporins expressed at the plasma membrane.
Collapse
Affiliation(s)
| | - Malak Alameh
- L’institut du Thorax, Nantes Université, CNRS, INSERM, F-44000 Nantes, France; (B.B.R.O.-M.); (M.A.)
- Labex Ion Channels, Science and Therapeutics, F-06560 Valbonne, France
| | - Béatrice Ollivier
- L’institut du Thorax, Nantes Université, CNRS, INSERM, F-44000 Nantes, France; (B.B.R.O.-M.); (M.A.)
| | - Jérôme Montnach
- L’institut du Thorax, Nantes Université, CNRS, INSERM, F-44000 Nantes, France; (B.B.R.O.-M.); (M.A.)
| | - Nicolas Bidère
- Team SOAP, CRCI2NA, INSERM, CNRS, Nantes Université, Université d’Angers, F-44000 Nantes, France
- Equipe Labellisée Ligue Contre le Cancer, F-75006 Paris, France
| | | | - Nicolas Escriou
- Institut Pasteur, Université Paris Cité, Département de Santé Globale, F-75015 Paris, France
| | - Flavien Charpentier
- L’institut du Thorax, Nantes Université, CNRS, INSERM, F-44000 Nantes, France; (B.B.R.O.-M.); (M.A.)
| | - Isabelle Baró
- L’institut du Thorax, Nantes Université, CNRS, INSERM, F-44000 Nantes, France; (B.B.R.O.-M.); (M.A.)
| | - Michel De Waard
- L’institut du Thorax, Nantes Université, CNRS, INSERM, F-44000 Nantes, France; (B.B.R.O.-M.); (M.A.)
- Labex Ion Channels, Science and Therapeutics, F-06560 Valbonne, France
| | - Gildas Loussouarn
- L’institut du Thorax, Nantes Université, CNRS, INSERM, F-44000 Nantes, France; (B.B.R.O.-M.); (M.A.)
| |
Collapse
|
2
|
Oliveira-Mendes BBR, Alameh M, Montnach J, Ollivier B, Gibaud S, Feliciangeli S, Lesage F, Charpentier F, Loussouarn G, De Waard M, Baró I. Predicting hERG repolarization power at 37°C from recordings at room temperature. Clin Transl Med 2023; 13:e1266. [PMID: 37199999 DOI: 10.1002/ctm2.1266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 04/25/2023] [Accepted: 05/08/2023] [Indexed: 05/19/2023] Open
Affiliation(s)
| | - Malak Alameh
- Nantes Université, CNRS, INSERM, l'institut du thorax, Nantes, France
- Labex ICST, Université Côte d'Azur, INSERM, Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | - Jérôme Montnach
- Nantes Université, CNRS, INSERM, l'institut du thorax, Nantes, France
| | - Béatrice Ollivier
- Nantes Université, CNRS, INSERM, l'institut du thorax, Nantes, France
| | - Solène Gibaud
- Labex ICST, Université Côte d'Azur, INSERM, Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | - Sylvain Feliciangeli
- Labex ICST, Université Côte d'Azur, INSERM, Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | - Florian Lesage
- Labex ICST, Université Côte d'Azur, INSERM, Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | | | - Gildas Loussouarn
- Nantes Université, CNRS, INSERM, l'institut du thorax, Nantes, France
| | - Michel De Waard
- Nantes Université, CNRS, INSERM, l'institut du thorax, Nantes, France
- Labex ICST, Université Côte d'Azur, INSERM, Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | - Isabelle Baró
- Nantes Université, CNRS, INSERM, l'institut du thorax, Nantes, France
| |
Collapse
|
3
|
Filipis L, Blömer LA, Montnach J, Loussouarn G, De Waard M, Canepari M. Nav1.2 and BK channels interaction shapes the action potential in the axon initial segment. J Physiol 2023; 601:1957-1979. [PMID: 36946031 DOI: 10.1113/jp283801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 03/15/2023] [Indexed: 03/23/2023] Open
Abstract
In neocortical layer-5 pyramidal neurons, the action potential (AP) is generated in the axon initial segment (AIS) when the membrane potential (Vm ) reaches the threshold for activation of the voltage-gated Na+ channels (VGNCs) Nav 1.2 and Nav 1.6. Yet, whereas it is known that these VGNCs differ in spatial distribution along the AIS and in biophysical properties, the understanding of the functional differences between the two channels remains elusive. Here, using ultrafast Na+ , Vm and Ca2+ imaging in combination with the partial block of Nav 1.2 by the peptide G1 G4 -huwentoxin-IV, we demonstrate an exclusive role of Nav 1.2 in shaping the generating AP. Precisely, we show that a selective block of ∼30% of Nav 1.2 widens the AP in the distal part of the AIS and we demonstrate that this effect is due to a loss of activation of BK Ca2+ -activated K+ channels (CAKCs). Indeed, Ca2+ influx via Nav 1.2 activates BK CAKCs determining the amplitude and the early phase of repolarisation of the AP in the AIS. By mean of control experiments using 4,9-Anhydrotetrodotoxin, which is a moderately selective inhibitor of Nav 1.6, we concluded that the Ca2+ influx shaping the early phase of the AP is exclusive of Nav 1.2. Hence, we mimicked this result with a NEURON model where the role of the different ion channels tested reproduced the experimental evidence. The exclusive role of Nav 1.2 reported here is important for understanding the physiology and pathology of neuronal excitability. KEY POINTS: We optically analysed the action potential that generates in the axon initial segment of mouse layer-5 neocortical pyramidal neurons and its associated Na+ and Ca2+ currents using ultrafast imaging techniques. We found that the partial selective block of the voltage-gated Na+ channel Nav1.2, produced by a recently developed peptide, widens the shape of the action potential in the distal part of the axon initial segment. We demonstrate that this effect is due to the reduction of the Ca2+ influx through Nav1.2 that activates BK Ca2+-activated K+ channels. To validate our conclusions, we generated a NEURON model that reproduces the ensemble of our experimental results. The present results indicate a specific role of Nav1.2 in the axon initial segment for the shaping of the action potential during its generation. Abstract figure legend In the axon initial segment of neocortical pyramidal neurons the voltage-gated Na+ channel Nav 1.2 contributes to the generation of the action potential by providing a Na+ current and a Ca2+ current that activates BK Ca2+ -activated K+ channels shaping the kinetics of the action potential. This article is protected by copyright. All rights reserved.
Collapse
Affiliation(s)
- Luiza Filipis
- Univ. Grenoble Alpes, CNRS, LIPhy, Grenoble, France
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Valbonne, France
| | - Laila Ananda Blömer
- Univ. Grenoble Alpes, CNRS, LIPhy, Grenoble, France
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Valbonne, France
| | - Jérôme Montnach
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Valbonne, France
- Nantes Université, CNRS, INSERM, l'institut du thorax, Nantes, France
| | - Gildas Loussouarn
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Valbonne, France
- Nantes Université, CNRS, INSERM, l'institut du thorax, Nantes, France
| | - Michel De Waard
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Valbonne, France
- Nantes Université, CNRS, INSERM, l'institut du thorax, Nantes, France
| | - Marco Canepari
- Univ. Grenoble Alpes, CNRS, LIPhy, Grenoble, France
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Valbonne, France
- Institut National de la Santé et Recherche Médicale, Paris, France
| |
Collapse
|
4
|
Alameh M, Oliveira-Mendes BR, Kyndt F, Rivron J, Denjoy I, Lesage F, Schott JJ, De Waard M, Loussouarn G. A need for exhaustive and standardized characterization of ion channels activity. The case of K V11.1. Front Physiol 2023; 14:1132533. [PMID: 36860515 PMCID: PMC9968853 DOI: 10.3389/fphys.2023.1132533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 01/30/2023] [Indexed: 02/16/2023] Open
Abstract
hERG, the pore-forming subunit of the rapid component of the delayed rectifier K+ current, plays a key role in ventricular repolarization. Mutations in the KCNH2 gene encoding hERG are associated with several cardiac rhythmic disorders, mainly the Long QT syndrome (LQTS) characterized by prolonged ventricular repolarization, leading to ventricular tachyarrhythmias, sometimes progressing to ventricular fibrillation and sudden death. Over the past few years, the emergence of next-generation sequencing has revealed an increasing number of genetic variants including KCNH2 variants. However, the potential pathogenicity of the majority of the variants remains unknown, thus classifying them as variants of uncertain significance or VUS. With diseases such as LQTS being associated with sudden death, identifying patients at risk by determining the variant pathogenicity, is crucial. The purpose of this review is to describe, on the basis of an exhaustive examination of the 1322 missense variants, the nature of the functional assays undertaken so far and their limitations. A detailed analysis of 38 hERG missense variants identified in Long QT French patients and studied in electrophysiology also underlies the incomplete characterization of the biophysical properties for each variant. These analyses lead to two conclusions: first, the function of many hERG variants has never been looked at and, second, the functional studies done so far are excessively heterogeneous regarding the stimulation protocols, cellular models, experimental temperatures, homozygous and/or the heterozygous condition under study, a context that may lead to conflicting conclusions. The state of the literature emphasizes how necessary and important it is to perform an exhaustive functional characterization of hERG variants and to standardize this effort for meaningful comparison among variants. The review ends with suggestions to create a unique homogeneous protocol that could be shared and adopted among scientists and that would facilitate cardiologists and geneticists in patient counseling and management.
Collapse
Affiliation(s)
- Malak Alameh
- CNRS, INSERM, l’institut du thorax, Nantes Université, CHU Nantes, Nantes, France,Labex ICST, INSERM, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d’Azur, Valbonne, France
| | - Barbara Ribeiro Oliveira-Mendes
- CNRS, INSERM, l’institut du thorax, Nantes Université, CHU Nantes, Nantes, France,*Correspondence: Barbara Ribeiro Oliveira-Mendes,
| | - Florence Kyndt
- CNRS, INSERM, l’institut du thorax, Nantes Université, CHU Nantes, Nantes, France
| | - Jordan Rivron
- CNRS, INSERM, l’institut du thorax, Nantes Université, CHU Nantes, Nantes, France
| | - Isabelle Denjoy
- Service de Cardiologie et CNMR Maladies Cardiaques Héréditaires Rares, Hôpital Bichat, Paris, France
| | - Florian Lesage
- Labex ICST, INSERM, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d’Azur, Valbonne, France
| | - Jean-Jacques Schott
- CNRS, INSERM, l’institut du thorax, Nantes Université, CHU Nantes, Nantes, France
| | - Michel De Waard
- CNRS, INSERM, l’institut du thorax, Nantes Université, CHU Nantes, Nantes, France,Labex ICST, INSERM, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d’Azur, Valbonne, France
| | - Gildas Loussouarn
- CNRS, INSERM, l’institut du thorax, Nantes Université, CHU Nantes, Nantes, France
| |
Collapse
|
5
|
Caillaud M, Le Dréan ME, De-Guilhem-de-Lataillade A, Le Berre-Scoul C, Montnach J, Nedellec S, Loussouarn G, Paillé V, Neunlist M, Boudin H. A functional network of highly pure enteric neurons in a dish. Front Neurosci 2023; 16:1062253. [PMID: 36685225 PMCID: PMC9853279 DOI: 10.3389/fnins.2022.1062253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 12/02/2022] [Indexed: 01/09/2023] Open
Abstract
The enteric nervous system (ENS) is the intrinsic nervous system that innervates the entire digestive tract and regulates major digestive functions. Recent evidence has shown that functions of the ENS critically rely on enteric neuronal connectivity; however, experimental models to decipher the underlying mechanisms are limited. Compared to the central nervous system, for which pure neuronal cultures have been developed for decades and are recognized as a reference in the field of neuroscience, an equivalent model for enteric neurons is lacking. In this study, we developed a novel model of highly pure rat embryonic enteric neurons with dense and functional synaptic networks. The methodology is simple and relatively fast. We characterized enteric neurons using immunohistochemical, morphological, and electrophysiological approaches. In particular, we demonstrated the applicability of this culture model to multi-electrode array technology as a new approach for monitoring enteric neuronal network activity. This in vitro model of highly pure enteric neurons represents a valuable new tool for better understanding the mechanisms involved in the establishment and maintenance of enteric neuron synaptic connectivity and functional networks.
Collapse
Affiliation(s)
- Martial Caillaud
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France,*Correspondence: Martial Caillaud,
| | - Morgane E. Le Dréan
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | | | - Catherine Le Berre-Scoul
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Jérôme Montnach
- Nantes Université, CNRS, INSERM, L’institut du Thorax, Nantes, France
| | - Steven Nedellec
- Nantes Université, CHU Nantes, CNRS, INSERM, BioCore, US16, SFR Bonamy, Nantes, France
| | - Gildas Loussouarn
- Nantes Université, CNRS, INSERM, L’institut du Thorax, Nantes, France
| | - Vincent Paillé
- Nantes Université, INRAE, IMAD, CRNH-O, UMR 1280, PhAN, Nantes, France
| | - Michel Neunlist
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Hélène Boudin
- Nantes Université, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| |
Collapse
|
6
|
Karlova M, Abramochkin DV, Pustovit KB, Nesterova T, Novoseletsky V, Loussouarn G, Zaklyazminskaya E, Sokolova OS. Disruption of a Conservative Motif in the C-Terminal Loop of the KCNQ1 Channel Causes LQT Syndrome. Int J Mol Sci 2022; 23:ijms23147953. [PMID: 35887302 PMCID: PMC9316142 DOI: 10.3390/ijms23147953] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 07/13/2022] [Accepted: 07/15/2022] [Indexed: 02/04/2023] Open
Abstract
We identified a single nucleotide variation (SNV) (c.1264A > G) in the KCNQ1 gene in a 5-year-old boy who presented with a prolonged QT interval. His elder brother and mother, but not sister and father, also had this mutation. This missense mutation leads to a p.Lys422Glu (K422E) substitution in the Kv7.1 protein that has never been mentioned before. We inserted this substitution in an expression plasmid containing Kv7.1 cDNA and studied the electrophysiological characteristics of the mutated channel expressed in CHO-K1, using the whole-cell configuration of the patch-clamp technique. Expression of the mutant Kv7.1 channel in both homo- and heterozygous conditions in the presence of auxiliary subunit KCNE1 results in a significant decrease in tail current densities compared to the expression of wild-type (WT) Kv7.1 and KCNE1. This study also indicates that K422E point mutation causes a dominant negative effect. The mutation was not associated with a trafficking defect; the mutant channel protein was confirmed to localize at the cell membrane. This mutation disrupts the poly-Lys strip in the proximal part of the highly conserved cytoplasmic A−B linker of Kv7.1 that was not shown before to be crucial for channel functioning.
Collapse
Affiliation(s)
- Maria Karlova
- Faculty of Biology, Lomonosov Moscow State University, 119234 Moscow, Russia; (M.K.); (D.V.A.); (K.B.P.); (V.N.)
| | - Denis V. Abramochkin
- Faculty of Biology, Lomonosov Moscow State University, 119234 Moscow, Russia; (M.K.); (D.V.A.); (K.B.P.); (V.N.)
| | - Ksenia B. Pustovit
- Faculty of Biology, Lomonosov Moscow State University, 119234 Moscow, Russia; (M.K.); (D.V.A.); (K.B.P.); (V.N.)
| | - Tatiana Nesterova
- Institute of Immunology and Physiology, Ural Branch of Russian Academy of Sciences, 620049 Ekaterinburg, Russia;
- Institute of Natural Sciences and Mathematics, Ural Federal University, 620075 Ekaterinburg, Russia
| | - Valery Novoseletsky
- Faculty of Biology, Lomonosov Moscow State University, 119234 Moscow, Russia; (M.K.); (D.V.A.); (K.B.P.); (V.N.)
- Biology Department, Shenzhen MSU-BIT University, Shenzhen 517182, China
| | - Gildas Loussouarn
- Nantes Université, CNRS, INSERM, l’institut du Thorax, F-44000 Nantes, France;
| | | | - Olga S. Sokolova
- Faculty of Biology, Lomonosov Moscow State University, 119234 Moscow, Russia; (M.K.); (D.V.A.); (K.B.P.); (V.N.)
- Biology Department, Shenzhen MSU-BIT University, Shenzhen 517182, China
- Correspondence: or
| |
Collapse
|
7
|
Oliveira‐Mendes B, Feliciangeli S, Ménard M, Chatelain F, Alameh M, Montnach J, Nicolas S, Ollivier B, Barc J, Baró I, Schott J, Probst V, Kyndt F, Denjoy I, Lesage F, Loussouarn G, De Waard M. A standardised hERG phenotyping pipeline to evaluate KCNH2 genetic variant pathogenicity. Clin Transl Med 2021; 11:e609. [PMID: 34841674 PMCID: PMC8609418 DOI: 10.1002/ctm2.609] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 09/22/2021] [Accepted: 09/28/2021] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND AND AIMS Mutations in KCNH2 cause long or short QT syndromes (LQTS or SQTS) predisposing to life-threatening arrhythmias. Over 1000 hERG variants have been described by clinicians, but most remain to be characterised. The objective is to standardise and accelerate the phenotyping process to contribute to clinician diagnosis and patient counselling. In silico evaluation was also included to characterise the structural impact of the variants. METHODS We selected 11 variants from known LQTS patients and two variants for which diagnosis was problematic. Using the Gibson assembly strategy, we efficiently introduced mutations in hERG cDNA despite GC-rich sequences. A pH-sensitive fluorescent tag was fused to hERG for efficient evaluation of channel trafficking. An optimised 35-s patch-clamp protocol was developed to evaluate hERG channel activity in transfected cells. R software was used to speed up analyses. RESULTS In the present work, we observed a good correlation between cell surface expression, assessed by the pH-sensitive tag, and current densities. Also, we showed that the new biophysical protocol allows a significant gain of time in recording ion channel properties and provides extensive information on WT and variant channel biophysical parameters, that can all be recapitulated in a single parameter defined herein as the repolarisation power. The impacts of the variants on channel structure were also reported where structural information was available. These three readouts (trafficking, repolarisation power and structural impact) define three pathogenicity indexes that may help clinical diagnosis. CONCLUSIONS Fast-track characterisation of KCNH2 genetic variants shows its relevance to discriminate mutants that affect hERG channel activity from variants with undetectable effects. It also helped the diagnosis of two new variants. This information is meant to fill a patient database, as a basis for personalised medicine. The next steps will be to further accelerate the process using an automated patch-clamp system.
Collapse
Affiliation(s)
| | - Sylvain Feliciangeli
- Labex ICST, Université Côte d'Azur, INSERMCentre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et CellulaireValbonneFrance
| | - Mélissa Ménard
- l'Institut du ThoraxInserm UMR 1087/CNRS UMR 6291NantesFrance
| | - Frank Chatelain
- Labex ICST, Université Côte d'Azur, INSERMCentre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et CellulaireValbonneFrance
| | - Malak Alameh
- l'Institut du ThoraxInserm UMR 1087/CNRS UMR 6291NantesFrance
| | - Jérôme Montnach
- l'Institut du ThoraxInserm UMR 1087/CNRS UMR 6291NantesFrance
| | | | | | - Julien Barc
- l'Institut du ThoraxInserm UMR 1087/CNRS UMR 6291NantesFrance
| | - Isabelle Baró
- l'Institut du ThoraxInserm UMR 1087/CNRS UMR 6291NantesFrance
| | | | - Vincent Probst
- CHU Nantes, l'Institut du Thorax, INSERM, CNRSUNIV NantesNantesFrance
| | - Florence Kyndt
- CHU Nantes, l'Institut du Thorax, INSERM, CNRSUNIV NantesNantesFrance
| | - Isabelle Denjoy
- Service de Cardiologie et CNMR Maladies Cardiaques Héréditaires RaresHôpital BichatParisFrance
| | - Florian Lesage
- Labex ICST, Université Côte d'Azur, INSERMCentre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et CellulaireValbonneFrance
| | | | - Michel De Waard
- l'Institut du ThoraxInserm UMR 1087/CNRS UMR 6291NantesFrance
| |
Collapse
|
8
|
Kacher YG, Karlova MG, Glukhov GS, Zhang H, Zaklyazminskaya EV, Loussouarn G, Sokolova OS. The Integrative Approach to Study of the Structure and Functions of Cardiac Voltage-Dependent Ion Channels. CRYSTALLOGR REP+ 2021. [DOI: 10.1134/s1063774521050072] [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: 11/23/2022]
|
9
|
Loussouarn G, Tarek M. Editorial: Molecular Mechanisms of Voltage-Gating in Ion Channels. Front Pharmacol 2021; 12:768153. [PMID: 34603066 PMCID: PMC8479100 DOI: 10.3389/fphar.2021.768153] [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] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 09/03/2021] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Mounir Tarek
- Université de Lorraine, LPCT, CNRS UMR 7019, Nancy, France
| |
Collapse
|
10
|
Al Sayed ZR, Canac R, Cimarosti B, Bonnard C, Gourraud JB, Hamamy H, Kayserili H, Girardeau A, Jouni M, Jacob N, Gaignerie A, Chariau C, David L, Forest V, Marionneau C, Charpentier F, Loussouarn G, Lamirault G, Reversade B, Zibara K, Lemarchand P, Gaborit N. Human model of IRX5 mutations reveals key role for this transcription factor in ventricular conduction. Cardiovasc Res 2021; 117:2092-2107. [PMID: 32898233 DOI: 10.1093/cvr/cvaa259] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 01/15/2020] [Accepted: 08/28/2020] [Indexed: 01/02/2023] Open
Abstract
AIMS Several inherited arrhythmic diseases have been linked to single gene mutations in cardiac ion channels and interacting proteins. However, the mechanisms underlying most arrhythmias, are thought to involve altered regulation of the expression of multiple effectors. In this study, we aimed to examine the role of a transcription factor (TF) belonging to the Iroquois homeobox family, IRX5, in cardiac electrical function. METHODS AND RESULTS Using human cardiac tissues, transcriptomic correlative analyses between IRX5 and genes involved in cardiac electrical activity showed that in human ventricular compartment, IRX5 expression strongly correlated to the expression of major actors of cardiac conduction, including the sodium channel, Nav1.5, and Connexin 40 (Cx40). We then generated human-induced pluripotent stem cells (hiPSCs) derived from two Hamamy syndrome-affected patients carrying distinct homozygous loss-of-function mutations in IRX5 gene. Cardiomyocytes derived from these hiPSCs showed impaired cardiac gene expression programme, including misregulation in the control of Nav1.5 and Cx40 expression. In accordance with the prolonged QRS interval observed in Hamamy syndrome patients, a slower ventricular action potential depolarization due to sodium current reduction was observed on electrophysiological analyses performed on patient-derived cardiomyocytes, confirming the functional role of IRX5 in electrical conduction. Finally, a cardiac TF complex was newly identified, composed by IRX5 and GATA4, in which IRX5 potentiated GATA4-induction of SCN5A expression. CONCLUSION Altogether, this work unveils a key role for IRX5 in the regulation of human ventricular depolarization and cardiac electrical conduction, providing therefore new insights into our understanding of cardiac diseases.
Collapse
Affiliation(s)
- Zeina R Al Sayed
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Robin Canac
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Bastien Cimarosti
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Carine Bonnard
- Institute of Medical Biology, A*STAR, 8A Biomedical Grove, Singapore 138648, Singapore
| | - Jean-Baptiste Gourraud
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
- Université de Nantes, CHU Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Hanan Hamamy
- Department of Genetic Medicine and Development, Geneva University, 1 rue Michel-Servet, Geneva 1211, Switzerland
| | - Hulya Kayserili
- Medical Genetics Department, Koç University School of Medicine(KUSOM), Rumelifeneri Yolu 34450, Istanbul, Turkey
| | - Aurore Girardeau
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Mariam Jouni
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Nicolas Jacob
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Anne Gaignerie
- Université de Nantes, CHU Nantes, Inserm, CNRS, SFR Santé, Inserm UMS 016, CNRS UMS 3556, 8 Quai Moncousu, F-44000 Nantes, France
| | - Caroline Chariau
- Université de Nantes, CHU Nantes, Inserm, CNRS, SFR Santé, Inserm UMS 016, CNRS UMS 3556, 8 Quai Moncousu, F-44000 Nantes, France
| | - Laurent David
- Université de Nantes, CHU Nantes, Inserm, CNRS, SFR Santé, Inserm UMS 016, CNRS UMS 3556, 8 Quai Moncousu, F-44000 Nantes, France
- Université de Nantes, INSERM, CRTI, 30 Bd Jean Monnet, F-44093 Nantes, France
- ITUN, CHU Nantes, 30 Bd Jean Monnet, F-44093 Nantes, France
| | - Virginie Forest
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Céline Marionneau
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Flavien Charpentier
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
- Université de Nantes, CHU Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Gildas Loussouarn
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Guillaume Lamirault
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
- Université de Nantes, CHU Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Bruno Reversade
- Institute of Medical Biology, A*STAR, 8A Biomedical Grove, Singapore 138648, Singapore
- Medical Genetics Department, Koç University School of Medicine(KUSOM), Rumelifeneri Yolu 34450, Istanbul, Turkey
- Department of Paediatrics, National University of Singapore, 1E Kent Ridge Road, Singapore 119228, Singapore
- Institute of Molecular and Cellular Biology, A*STAR, 61 Biopolis Drive, Singapore 138673, Singapore
- Reproductive Biology Laboratory, Amsterdam UMC, Meibergdreef 9 1105, Amsterdam-Zuidoost, Netherlands
| | - Kazem Zibara
- ER045, Laboratory of stem cells, DSST, Biology department, Faculty of Sciences, Lebanese University, Rafic Hariri Campus - Hadath, Beirut 1700, Lebanon
| | - Patricia Lemarchand
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
- Université de Nantes, CHU Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| | - Nathalie Gaborit
- Université de Nantes, CNRS, INSERM, l'institut du thorax, 8 quai Moncousu, F-44000 Nantes, France
| |
Collapse
|
11
|
Montnach J, Baró I, Charpentier F, De Waard M, Loussouarn G. Modelling sudden cardiac death risks factors in patients with coronavirus disease of 2019: the hydroxychloroquine and azithromycin case. Europace 2021; 23:1124-1133. [PMID: 34009333 PMCID: PMC8135857 DOI: 10.1093/europace/euab043] [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] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 02/16/2021] [Indexed: 12/23/2022] Open
Abstract
AIMS Coronavirus disease of 2019 (COVID-19) has rapidly become a worldwide pandemic. Many clinical trials have been initiated to fight the disease. Among those, hydroxychloroquine and azithromycin had initially been suggested to improve clinical outcomes. Despite any demonstrated beneficial effects, they are still in use in some countries but have been reported to prolong the QT interval and induce life-threatening arrhythmia. Since a significant proportion of the world population may be treated with such COVID-19 therapies, evaluation of the arrhythmogenic risk of any candidate drug is needed. METHODS AND RESULTS Using the O'Hara-Rudy computer model of human ventricular wedge, we evaluate the arrhythmogenic potential of clinical factors that can further alter repolarization in COVID-19 patients in addition to hydroxychloroquine (HCQ) and azithromycin (AZM) such as tachycardia, hypokalaemia, and subclinical to mild long QT syndrome. Hydroxychloroquine and AZM drugs have little impact on QT duration and do not induce any substrate prone to arrhythmia in COVID-19 patients with normal cardiac repolarization reserve. Nevertheless, in every tested condition in which this reserve is reduced, the model predicts larger electrocardiogram impairments, as with dofetilide. In subclinical conditions, the model suggests that mexiletine limits the deleterious effects of AZM and HCQ. CONCLUSION By studying the HCQ and AZM co-administration case, we show that the easy-to-use O'Hara-Rudy model can be applied to assess the QT-prolongation potential of off-label drugs, beyond HCQ and AZM, in different conditions representative of COVID-19 patients and to evaluate the potential impact of additional drug used to limit the arrhythmogenic risk.
Collapse
Affiliation(s)
- Jérôme Montnach
- Université de Nantes, CNRS, INSERM, l’institut du thorax, Nantes F-44000, France
| | - Isabelle Baró
- Université de Nantes, CNRS, INSERM, l’institut du thorax, Nantes F-44000, France
| | - Flavien Charpentier
- Université de Nantes, CNRS, INSERM, l’institut du thorax, Nantes F-44000, France
| | - Michel De Waard
- Université de Nantes, CNRS, INSERM, l’institut du thorax, Nantes F-44000, France
- Laboratory of Excellence, Ion Channels, Science & Therapeutics, Valbonne F-06560, France
| | - Gildas Loussouarn
- Université de Nantes, CNRS, INSERM, l’institut du thorax, Nantes F-44000, France
| |
Collapse
|
12
|
Al Sayed ZR, Jouni M, Gourraud JB, Belbachir N, Barc J, Girardeau A, Forest V, Derevier A, Gaignerie A, Chariau C, Cimarosti B, Canac R, Olchesqui P, Charpentier E, Schott JJ, Redon R, Baró I, Probst V, Charpentier F, Loussouarn G, Zibara K, Lamirault G, Lemarchand P, Gaborit N. A consistent arrhythmogenic trait in Brugada syndrome cellular phenotype. Clin Transl Med 2021; 11:e413. [PMID: 34185406 PMCID: PMC8181201 DOI: 10.1002/ctm2.413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 04/14/2021] [Accepted: 04/21/2021] [Indexed: 02/05/2023] Open
Affiliation(s)
| | - Mariam Jouni
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France
| | - Jean-Baptiste Gourraud
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France.,l'institut du thorax, CHU Nantes, Nantes, France
| | | | - Julien Barc
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France
| | | | - Virginie Forest
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France
| | - Aude Derevier
- Nantes Université, CHU Nantes, Inserm, CNRS, SFR Santé, Nantes, France
| | - Anne Gaignerie
- Nantes Université, CHU Nantes, Inserm, CNRS, SFR Santé, Nantes, France
| | - Caroline Chariau
- Nantes Université, CHU Nantes, Inserm, CNRS, SFR Santé, Nantes, France
| | | | - Robin Canac
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France
| | | | | | - Jean-Jacques Schott
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France.,l'institut du thorax, CHU Nantes, Nantes, France
| | - Richard Redon
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France.,l'institut du thorax, CHU Nantes, Nantes, France
| | - Isabelle Baró
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France
| | - Vincent Probst
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France.,l'institut du thorax, CHU Nantes, Nantes, France
| | - Flavien Charpentier
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France.,l'institut du thorax, CHU Nantes, Nantes, France
| | | | - Kazem Zibara
- Laboratory of Stem Cells, PRASE, Biology Department, Faculty of Sciences, Lebanese University, Beirut, Lebanon
| | - Guillaume Lamirault
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France.,l'institut du thorax, CHU Nantes, Nantes, France
| | - Patricia Lemarchand
- l'institut du thorax, Inserm, CNRS, UNIV Nantes, Nantes, France.,l'institut du thorax, CHU Nantes, Nantes, France
| | | |
Collapse
|
13
|
Ribeiro de Oliveira Mendes B, Feliciangeli S, Menard M, Chatelain F, Montnach J, Nicolas S, Ollivier B, Baro I, Schott J, Probst V, Kyndt F, Denjoy I, Lesage F, Loussouarn G, De Waard M. Fast Track hERG phenotyping to evaluate the pathogenicity of KCNH2 genetic variants. Archives of Cardiovascular Diseases Supplements 2021. [DOI: 10.1016/j.acvdsp.2021.04.157] [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: 11/29/2022]
|
14
|
Montnach J, Lorenzini M, Lesage A, Simon I, Nicolas S, Moreau E, Marionneau C, Baró I, De Waard M, Loussouarn G. Computer modeling of whole-cell voltage-clamp analyses to delineate guidelines for good practice of manual and automated patch-clamp. Sci Rep 2021; 11:3282. [PMID: 33558601 PMCID: PMC7870888 DOI: 10.1038/s41598-021-82077-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 12/21/2020] [Indexed: 01/17/2023] Open
Abstract
The patch-clamp technique and more recently the high throughput patch-clamp technique have contributed to major advances in the characterization of ion channels. However, the whole-cell voltage-clamp technique presents certain limits that need to be considered for robust data generation. One major caveat is that increasing current amplitude profoundly impacts the accuracy of the biophysical analyses of macroscopic ion currents under study. Using mathematical kinetic models of a cardiac voltage-gated sodium channel and a cardiac voltage-gated potassium channel, we demonstrated how large current amplitude and series resistance artefacts induce an undetected alteration in the actual membrane potential and affect the characterization of voltage-dependent activation and inactivation processes. We also computed how dose-response curves are hindered by high current amplitudes. This is of high interest since stable cell lines frequently demonstrating high current amplitudes are used for safety pharmacology using the high throughput patch-clamp technique. It is therefore critical to set experimental limits for current amplitude recordings to prevent inaccuracy in the characterization of channel properties or drug activity, such limits being different from one channel type to another. Based on the predictions generated by the kinetic models, we draw simple guidelines for good practice of whole-cell voltage-clamp recordings.
Collapse
Affiliation(s)
- Jérôme Montnach
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - Maxime Lorenzini
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - Adrien Lesage
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - Isabelle Simon
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - Sébastien Nicolas
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - Eléonore Moreau
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
- Laboratoire Signalisation Fonctionnelle des Canaux Ioniques et des Récepteurs (SiFCIR), UPRES EA 2647, USC INRA 1330, SFR QUASAV 4207, UFR Sciences, Université d'Angers, Angers, France
| | - Céline Marionneau
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - Isabelle Baró
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - Michel De Waard
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
- LabEx "Ion Channels, Science & Therapeutics", 06560, Valbonne, France
| | - Gildas Loussouarn
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France.
| |
Collapse
|
15
|
Montnach J, Ribeiro De Oliveira Mendes B, De Waard S, Correia E, Nicolas S, Forest V, Jopling C, Gaborit N, Lemarchand P, Loussouarn G, De Waard M. Optical control of hERG channel activity using a photosensitive Bekm-1 blocker. Archives of Cardiovascular Diseases Supplements 2020. [DOI: 10.1016/j.acvdsp.2020.03.140] [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: 10/23/2022]
|
16
|
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.
Collapse
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
| |
Collapse
|
17
|
Malak OA, Abderemane-Ali F, Wei Y, Coyan FC, Pontus G, Shaya D, Marionneau C, Loussouarn G. Up-regulation of voltage-gated sodium channels by peptides mimicking S4-S5 linkers reveals a variation of the ligand-receptor mechanism. Sci Rep 2020; 10:5852. [PMID: 32246066 PMCID: PMC7125111 DOI: 10.1038/s41598-020-62615-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 03/12/2020] [Indexed: 11/09/2022] Open
Abstract
Prokaryotic NaV channels are tetramers and eukaryotic NaV channels consist of a single subunit containing four domains. Each monomer/domain contains six transmembrane segments (S1-S6), S1-S4 being the voltage-sensor domain and S5-S6 the pore domain. A crystal structure of NaVMs, a prokaryotic NaV channel, suggests that the S4-S5 linker (S4-S5L) interacts with the C-terminus of S6 (S6T) to stabilize the gate in the open state. However, in several voltage-gated potassium channels, using specific S4-S5L-mimicking peptides, we previously demonstrated that S4-S5L/S6T interaction stabilizes the gate in the closed state. Here, we used the same strategy on another prokaryotic NaV channel, NaVSp1, to test whether equivalent peptides stabilize the channel in the open or closed state. A NaVSp1-specific S4-S5L peptide, containing the residues supposed to interact with S6T according to the NaVMs structure, induced both an increase in NaVSp1 current density and a negative shift in the activation curve, consistent with S4-S5L stabilizing the open state. Using this approach on a human NaV channel, hNaV1.4, and testing 12 hNaV1.4 S4-S5L peptides, we identified four activating S4-S5L peptides. These results suggest that, in eukaryotic NaV channels, the S4-S5L of DI, DII and DIII domains allosterically modulate the activation gate and stabilize its open state.
Collapse
Affiliation(s)
- Olfat A Malak
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France.,Buck Institute for Research on Aging, 8001 Redwood Blvd, Novato, California, 94945, USA
| | - Fayal Abderemane-Ali
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France.,Cardiovascular Research Institute, University of California, San Francisco, California, 941158-9001, USA
| | - Yue Wei
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France.,Department of Cardiology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Fabien C Coyan
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - Gilyane Pontus
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - David Shaya
- Cardiovascular Research Institute, University of California, San Francisco, California, 941158-9001, USA
| | - Céline Marionneau
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France
| | - Gildas Loussouarn
- Université de Nantes, CNRS, INSERM, l'institut du thorax, F-44000, Nantes, France.
| |
Collapse
|
18
|
Malak OA, Gluhov GS, Grizel AV, Kudryashova KS, Sokolova OS, Loussouarn G. Voltage-dependent activation in EAG channels follows a ligand-receptor rather than a mechanical-lever mechanism. J Biol Chem 2019; 294:6506-6521. [PMID: 30808709 DOI: 10.1074/jbc.ra119.007626] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 02/21/2019] [Indexed: 01/08/2023] Open
Abstract
Ether-a-go-go family (EAG) channels play a major role in many physiological processes in humans, including cardiac repolarization and cell proliferation. Cryo-EM structures of two of them, KV10.1 and human ether-a-go-go-related gene (hERG or KV11.1), have revealed an original nondomain-swapped structure, suggesting that the mechanism of voltage-dependent gating of these two channels is quite different from the classical mechanical-lever model. Molecular aspects of hERG voltage-gating have been extensively studied, indicating that the S4-S5 linker (S4-S5L) acts as a ligand binding to the S6 gate (S6 C-terminal part, S6T) and stabilizes it in a closed state. Moreover, the N-terminal extremity of the channel, called N-Cap, has been suggested to interact with S4-S5L to modulate channel voltage-dependent gating, as N-Cap deletion drastically accelerates hERG channel deactivation. In this study, using COS-7 cells, site-directed mutagenesis, electrophysiological measurements, and immunofluorescence confocal microscopy, we addressed whether these two major mechanisms of voltage-dependent gating are conserved in KV10.2 channels. Using cysteine bridges and S4-S5L-mimicking peptides, we show that the ligand/receptor model is conserved in KV10.2, suggesting that this model is a hallmark of EAG channels. Truncation of the N-Cap domain, Per-Arnt-Sim (PAS) domain, or both in KV10.2 abolished the current and altered channel trafficking to the membrane, unlike for the hERG channel in which N-Cap and PAS domain truncations mainly affected channel deactivation. Our results suggest that EAG channels function via a conserved ligand/receptor model of voltage gating, but that the N-Cap and PAS domains have different roles in these channels.
Collapse
Affiliation(s)
- Olfat A Malak
- From the INSERM, CNRS, l'Institut du Thorax, Université de Nantes, 44007 Nantes, France
| | - Grigory S Gluhov
- the Moscow M.V. Lomonosov State University, Moscow 119234, Russia
| | - Anastasia V Grizel
- the Saint Petersburg State University, Saint Petersburg 199034, Russia, and
| | - Kseniya S Kudryashova
- the Moscow M.V. Lomonosov State University, Moscow 119234, Russia.,the Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of Russian Academy of Sciences, Moscow 117997, Russia
| | - Olga S Sokolova
- the Moscow M.V. Lomonosov State University, Moscow 119234, Russia
| | - Gildas Loussouarn
- From the INSERM, CNRS, l'Institut du Thorax, Université de Nantes, 44007 Nantes, France,
| |
Collapse
|
19
|
Abstract
In recent years, molecular modeling techniques, combined with MD simulations, provided significant insights on voltage-gated (Kv) potassium channels intrinsic properties. Among the success stories are the highlight of molecular level details of the effects of mutations, the unraveling of several metastable intermediate states, and the influence of a particular lipid, PIP2, in the stability and the modulation of Kv channel function. These computational studies offered a detailed view that could not have been reached through experimental studies alone. With the increase of cross disciplinary studies, numerous experiments provided validation of these computational results, which endows an increase in the reliability of molecular modeling for the study of Kv channels. This chapter offers a description of the main techniques used to model Kv channels at the atomistic level.
Collapse
Affiliation(s)
- Audrey Deyawe
- Structure et Réactivité des Systèmes Moléculaires Complexes, CNRS, Université de Lorraine, Nancy, France
| | - Marina A Kasimova
- Structure et Réactivité des Systèmes Moléculaires Complexes, CNRS, Université de Lorraine, Nancy, France
| | - Lucie Delemotte
- Structure et Réactivité des Systèmes Moléculaires Complexes, CNRS, Université de Lorraine, Nancy, France
| | - Gildas Loussouarn
- L'institut du thorax, Inserm, CNRS, Université de Nantes, Nantes, France
| | - Mounir Tarek
- Structure et Réactivité des Systèmes Moléculaires Complexes, CNRS, Université de Lorraine, Nancy, France.
- CNRS, Unité Mixte de Recherches 7565, Université de Lorraine, Boulevard des Aiguillettes, BP 70239, 54506, Vandoeuvre-lès-Nancy, France.
| |
Collapse
|
20
|
Pouradier F, Liu C, Wares J, Yokoyama E, Collaudin C, Panhard S, Saint-Léger D, Loussouarn G. The worldwide diversity of scalp seborrhoea, as daily experienced by seven human ethnic groups. Int J Cosmet Sci 2017; 39:629-636. [PMID: 28865103 DOI: 10.1111/ics.12425] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 06/16/2017] [Accepted: 08/22/2017] [Indexed: 11/27/2022]
Abstract
OBJECTIVE The re-greasing process and kinetics of the human scalp, post-shampooing, have been previously documented, in vivo, on a few Caucasian subjects. The objective of the presented research was to extend such knowledge over seven different ethnic groups. METHODS The post-shampooing re-greasing kinetics of the scalp was studied on 1325 subjects (women and men of two distinct age classes) from seven different ethnic groups in their residential and native country. Sebum amounts were determined onto small shaved scalp areas at various times post-shampooing, using the Sebumeter® technique. RESULTS As previously published on Caucasian subjects, scalp re-greasing process follows a hyperbolic-like kinetics over days. However, amounts of collected sebum highly vary with ethnicity. As recorded through the casual level (CL) at the equilibrium phase, 2-3 days post-shampooing, the highest amount of sebum was found in African American subjects, followed in descending order by Caucasian American, Japanese, Chinese, Thai, Caucasian European and Indian subjects, the latter showing very low values. Lower amounts of sebum were recorded in the older age class in all ethnics, as compared to the younger one, and male subjects were found higher sebum producers than women, irrespective of ethnicity. CONCLUSION The kinetics and slopes of the re-greasing process of the human scalp appear similar in all ethnic groups studied. However, striking quantitative differences are found between the seven ethnic groups, resulting from different sebaceous production levels and scalp hygiene routines.
Collapse
Affiliation(s)
- F Pouradier
- L'Oreal Research and Innovation, 11-13 rue Dora Maar, 93400, Saint-Ouen, France
| | - C Liu
- L'Oreal Research and Innovation, No. 550 JinYu Rd., Pudong New Area, Shanghai, Pudong, 210206, China
| | - J Wares
- L'Oreal Research and Innovation, 159 Terminal Ave, Clark, NJ, 07066, U.S.A
| | - E Yokoyama
- L'Oreal Research and Innovation, KSP R&I-A1101, 2-1, Sakado 3-chome, Kawasaki, 213-0012, Kanagawa, Japan
| | - C Collaudin
- L'Oreal Research and Innovation, No. 550 JinYu Rd., Pudong New Area, Shanghai, Pudong, 210206, China
| | - S Panhard
- L'Oreal Research and Innovation, 11-13 rue Dora Maar, 93400, Saint-Ouen, France
| | - D Saint-Léger
- L'Oreal Research and Innovation, No. 550 JinYu Rd., Pudong New Area, Shanghai, Pudong, 210206, China
| | - G Loussouarn
- L'Oreal Research and Innovation, 11-13 rue Dora Maar, 93400, Saint-Ouen, France
| |
Collapse
|
21
|
Burel S, Coyan FC, Lorenzini M, Meyer MR, Lichti CF, Brown JH, Loussouarn G, Charpentier F, Nerbonne JM, Townsend RR, Maier LS, Marionneau C. C-terminal phosphorylation of Na V1.5 impairs FGF13-dependent regulation of channel inactivation. J Biol Chem 2017; 292:17431-17448. [PMID: 28882890 DOI: 10.1074/jbc.m117.787788] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [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: 03/22/2017] [Revised: 08/23/2017] [Indexed: 11/06/2022] Open
Abstract
Voltage-gated Na+ (NaV) channels are key regulators of myocardial excitability, and Ca2+/calmodulin-dependent protein kinase II (CaMKII)-dependent alterations in NaV1.5 channel inactivation are emerging as a critical determinant of arrhythmias in heart failure. However, the global native phosphorylation pattern of NaV1.5 subunits associated with these arrhythmogenic disorders and the associated channel regulatory defects remain unknown. Here, we undertook phosphoproteomic analyses to identify and quantify in situ the phosphorylation sites in the NaV1.5 proteins purified from adult WT and failing CaMKIIδc-overexpressing (CaMKIIδc-Tg) mouse ventricles. Of 19 native NaV1.5 phosphorylation sites identified, two C-terminal phosphoserines at positions 1938 and 1989 showed increased phosphorylation in the CaMKIIδc-Tg compared with the WT ventricles. We then tested the hypothesis that phosphorylation at these two sites impairs fibroblast growth factor 13 (FGF13)-dependent regulation of NaV1.5 channel inactivation. Whole-cell voltage-clamp analyses in HEK293 cells demonstrated that FGF13 increases NaV1.5 channel availability and decreases late Na+ current, two effects that were abrogated with NaV1.5 mutants mimicking phosphorylation at both sites. Additional co-immunoprecipitation experiments revealed that FGF13 potentiates the binding of calmodulin to NaV1.5 and that phosphomimetic mutations at both sites decrease the interaction of FGF13 and, consequently, of calmodulin with NaV1.5. Together, we have identified two novel native phosphorylation sites in the C terminus of NaV1.5 that impair FGF13-dependent regulation of channel inactivation and may contribute to CaMKIIδc-dependent arrhythmogenic disorders in failing hearts.
Collapse
Affiliation(s)
- Sophie Burel
- From the l'Institut du Thorax, INSERM, CNRS, UNIV Nantes, Nantes 44007, France
| | - Fabien C Coyan
- From the l'Institut du Thorax, INSERM, CNRS, UNIV Nantes, Nantes 44007, France
| | - Maxime Lorenzini
- From the l'Institut du Thorax, INSERM, CNRS, UNIV Nantes, Nantes 44007, France
| | | | - Cheryl F Lichti
- the Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, Texas 77555
| | - Joan H Brown
- the Department of Pharmacology, University of California at San Diego, La Jolla, California 92093-0636, and
| | - Gildas Loussouarn
- From the l'Institut du Thorax, INSERM, CNRS, UNIV Nantes, Nantes 44007, France
| | - Flavien Charpentier
- From the l'Institut du Thorax, INSERM, CNRS, UNIV Nantes, Nantes 44007, France
| | | | - R Reid Townsend
- Internal Medicine, and.,Cell Biology and Physiology, Washington University Medical School, St. Louis, Missouri 63110
| | - Lars S Maier
- the Department of Internal Medicine II, University Heart Center, University Hospital Regensburg, D-93042 Regensburg, Germany
| | - Céline Marionneau
- From the l'Institut du Thorax, INSERM, CNRS, UNIV Nantes, Nantes 44007, France,
| |
Collapse
|
22
|
Malak OA, Es-Salah-Lamoureux Z, Loussouarn G. P1085Regulation of hERG cardiac potassium channels by exogenous peptides. Europace 2017. [DOI: 10.1093/ehjci/eux150.008] [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: 11/13/2022] Open
|
23
|
Malak O, Es-Salah-Lamoureux Z, Loussouarn G. hERG S4-S5 linker acts as a voltage-dependent ligand that binds to the activation gate and locks it in a closed state. Archives of Cardiovascular Diseases Supplements 2017. [DOI: 10.1016/s1878-6480(17)30501-3] [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: 12/01/2022]
|
24
|
Es-Salah-Lamoureux Z, Jouni M, Malak OA, Belbachir N, Al Sayed ZR, Gandon-Renard M, Lamirault G, Gauthier C, Baró I, Charpentier F, Zibara K, Lemarchand P, Beaumelle B, Gaborit N, Loussouarn G. HIV-Tat induces a decrease in I Kr and I Ks via reduction in phosphatidylinositol-(4,5)-bisphosphate availability. J Mol Cell Cardiol 2016; 99:1-13. [DOI: 10.1016/j.yjmcc.2016.08.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 08/23/2016] [Accepted: 08/29/2016] [Indexed: 02/07/2023]
|
25
|
Reygagne P, Piérard GE, Loussouarn G, Le Nôtre N, Ziane S. [How I treat … dandruff using a shampoo with a sulfate-free tensio-active]. Rev Med Liege 2016; 71:365-370. [PMID: 28383830] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A new formulation of an anti-dandruff shampoo containing a surfactant devoid of a sulfate-type anionic part has been assessed in vivo in 41 subjects. Introducing a welltried agent, the 0.5 % piroctone olamine confers to this shampoo a high anti-dandruff efficacy, a reduction in the density in Malassezia spp, as well as a good remanence after shampoo. In addition, piroctone olamine appears to influence the sebum rheology by reducing the hair greasing.
Collapse
Affiliation(s)
- P Reygagne
- Centre de Santé Sabouraud, Hôpital Saint-Louis, Paris, France
| | - G E Piérard
- Département des Sciences cliniques, Université de Liège
- Université de Franche-Comté, Besançon, France
| | - G Loussouarn
- Département Evaluation Performance Produits, L'Oréal Recherche et Innovation, Saint-Ouen, France
| | - N Le Nôtre
- Département Evaluation Performance Produits, L'Oréal Recherche et Innovation, Saint-Ouen, France
| | - S Ziane
- Département Evaluation Performance Produits, L'Oréal Recherche et Innovation, Saint-Ouen, France
| |
Collapse
|
26
|
Lozano I, Saunier JB, Panhard S, Loussouarn G. The diversity of the human hair colour assessed by visual scales and instrumental measurements. A worldwide survey. Int J Cosmet Sci 2016; 39:101-107. [PMID: 27506896 DOI: 10.1111/ics.12359] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 08/06/2016] [Indexed: 11/27/2022]
Abstract
OBJECTIVES To study (i) the diversity of the natural colour of the human hair through both visual assessment of hair tone levels and colorimetric measurements of hair strands collected from 2057 human male and female volunteers, from 23 regions of the world and (ii) the correlation between visual assessments and colorimetric measurements. METHODS Hair strands were analysed by a spectrocolorimeter under the L*, a*, b* referential system and scored in vivo by experts before sampling, through standardized visual reference scales based on a 1-10 range. RESULTS Results show that from a typological aspect, black or dark brown hairs largely predominate among studied ethnic groups, whereas Caucasian or derived populations exhibit the widest palette of medium to fair shades, partly explaining some past interbreeding among populations. Instrumental measurements clearly confirm that a given colour of a pigmented hair, at the exclusion of red hairs, is mostly governed by two components, L* and b*, from the L*, a*, b* reference system. CONCLUSION The comparisons between visual assessments and instrumental data show that these appear closely linked. Darker hairs show close or subtle variations in L*, a*, b* parameters, making their individual colour differentiation calling for technical improvements in colorimetric measurements. The latter are likely governed by other physical factors such as shape, diameter and shine.
Collapse
Affiliation(s)
- I Lozano
- L'Oréal Research & Innovation, 11-13 rue Dora Maar 93400, Saint Ouen, France
| | - J B Saunier
- L'Oréal Research & Innovation, 11-13 rue Dora Maar 93400, Saint Ouen, France
| | - S Panhard
- L'Oréal Research & Innovation, 11-13 rue Dora Maar 93400, Saint Ouen, France
| | - G Loussouarn
- L'Oréal Research & Innovation, 11-13 rue Dora Maar 93400, Saint Ouen, France
| |
Collapse
|
27
|
Portero V, Le Scouarnec S, Es-Salah-Lamoureux Z, Burel S, Gourraud JB, Bonnaud S, Lindenbaum P, Simonet F, Violleau J, Baron E, Moreau E, Scott C, Chatel S, Loussouarn G, O'Hara T, Mabo P, Dina C, Le Marec H, Schott JJ, Probst V, Baró I, Marionneau C, Charpentier F, Redon R. Dysfunction of the Voltage-Gated K+ Channel β2 Subunit in a Familial Case of Brugada Syndrome. J Am Heart Assoc 2016; 5:JAHA.115.003122. [PMID: 27287695 PMCID: PMC4937261 DOI: 10.1161/jaha.115.003122] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND The Brugada syndrome is an inherited cardiac arrhythmia associated with high risk of sudden death. Although 20% of patients with Brugada syndrome carry mutations in SCN5A, the molecular mechanisms underlying this condition are still largely unknown. METHODS AND RESULTS We combined whole-exome sequencing and linkage analysis to identify the genetic variant likely causing Brugada syndrome in a pedigree for which SCN5A mutations had been excluded. This approach identified 6 genetic variants cosegregating with the Brugada electrocardiographic pattern within the pedigree. In silico gene prioritization pointed to 1 variant residing in KCNAB2, which encodes the voltage-gated K(+) channel β2-subunit (Kvβ2-R12Q). Kvβ2 is widely expressed in the human heart and has been shown to interact with the fast transient outward K(+) channel subunit Kv4.3, increasing its current density. By targeted sequencing of the KCNAB2 gene in 167 unrelated patients with Brugada syndrome, we found 2 additional rare missense variants (L13F and V114I). We then investigated the physiological effects of the 3 KCNAB2 variants by using cellular electrophysiology and biochemistry. Patch-clamp experiments performed in COS-7 cells expressing both Kv4.3 and Kvβ2 revealed a significant increase in the current density in presence of the R12Q and L13F Kvβ2 mutants. Although biotinylation assays showed no differences in the expression of Kv4.3, the total and submembrane expression of Kvβ2-R12Q were significantly increased in comparison with wild-type Kvβ2. CONCLUSIONS Altogether, our results indicate that Kvβ2 dysfunction can contribute to the Brugada electrocardiographic pattern.
Collapse
Affiliation(s)
- Vincent Portero
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France
| | - Solena Le Scouarnec
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France The Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK
| | - Zeineb Es-Salah-Lamoureux
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France
| | - Sophie Burel
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France
| | - Jean-Baptiste Gourraud
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Stéphanie Bonnaud
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Pierre Lindenbaum
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Floriane Simonet
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France
| | - Jade Violleau
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Estelle Baron
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France
| | | | - Carol Scott
- The Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK
| | - Stéphanie Chatel
- CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Gildas Loussouarn
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France
| | | | | | - Christian Dina
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Hervé Le Marec
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Jean-Jacques Schott
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Vincent Probst
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Isabelle Baró
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France
| | - Céline Marionneau
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France
| | - Flavien Charpentier
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| | - Richard Redon
- INSERM, UMR 1087, l'Institut du Thorax, Nantes, France CNRS, UMR 6291, Nantes, France Université de Nantes, Nantes, France CHU Nantes, l'Institut du Thorax, Service de Cardiologie, Nantes, France
| |
Collapse
|
28
|
Bouabbache S, Galliano A, Littaye P, Leportier M, Pouradier F, Gillot E, Panhard S, Loussouarn G. What is a Caucasian ‘fine’ hair? Comparing instrumental measurements, self-perceptions and assessments from hair experts. Int J Cosmet Sci 2016; 38:581-588. [DOI: 10.1111/ics.12323] [Citation(s) in RCA: 9] [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: 12/03/2015] [Accepted: 03/25/2016] [Indexed: 11/28/2022]
Affiliation(s)
- S. Bouabbache
- L'Oréal Research and Innovation; Centre Charles Zviak; 11-13 rue Dora Maar 93400 Saint-Ouen, France
| | - A. Galliano
- L'Oréal Research and Innovation; Centre Charles Zviak; 11-13 rue Dora Maar 93400 Saint-Ouen, France
| | - P. Littaye
- L'Oréal Research and Innovation; Centre Charles Zviak; 11-13 rue Dora Maar 93400 Saint-Ouen, France
| | - M. Leportier
- L'Oréal Research and Innovation; Centre Charles Zviak; 11-13 rue Dora Maar 93400 Saint-Ouen, France
| | - F. Pouradier
- L'Oréal Research and Innovation; Centre Charles Zviak; 11-13 rue Dora Maar 93400 Saint-Ouen, France
| | - E. Gillot
- L'Oréal Research and Innovation; Centre Charles Zviak; 11-13 rue Dora Maar 93400 Saint-Ouen, France
| | - S. Panhard
- L'Oréal Research and Innovation; Centre Charles Zviak; 11-13 rue Dora Maar 93400 Saint-Ouen, France
| | - G. Loussouarn
- L'Oréal Research and Innovation; Centre Charles Zviak; 11-13 rue Dora Maar 93400 Saint-Ouen, France
| |
Collapse
|
29
|
Es-Salah-Lamoureux Z, Jouni M, Belbachir N, Gandon-Renard M, Beaumelle B, Baró I, Charpentier F, Zibara K, Lemarchand P, Gaborit N, Loussouarn G. A Molecular Substrate for Long QT in HIV Patients: Tat Protein Reduces IKR in Human Induced Pluripotent Stem Cells-Derived Cardiomyocytes. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.612] [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: 11/29/2022] Open
|
30
|
Malak O, Loussouarn G, Es-Salah-Lamoureux Z. hERG S4-S5 acts as a Voltage-Dependent Ligand Binding the Activation Gate and Locking it in a Closed State. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.1509] [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: 10/22/2022] Open
|
31
|
Loussouarn G, Sternberg D, Nicole S, Marionneau C, Le Bouffant F, Toumaniantz G, Barc J, Malak OA, Fressart V, Péréon Y, Baró I, Charpentier F. Physiological and Pathophysiological Insights of Nav1.4 and Nav1.5 Comparison. Front Pharmacol 2016; 6:314. [PMID: 26834636 PMCID: PMC4712308 DOI: 10.3389/fphar.2015.00314] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 12/21/2015] [Indexed: 12/19/2022] Open
Abstract
Mutations in Nav1.4 and Nav1.5 α-subunits have been associated with muscular and cardiac channelopathies, respectively. Despite intense research on the structure and function of these channels, a lot of information is still missing to delineate the various physiological and pathophysiological processes underlying their activity at the molecular level. Nav1.4 and Nav1.5 sequences are similar, suggesting structural and functional homologies between the two orthologous channels. This also suggests that any characteristics described for one channel subunit may shed light on the properties of the counterpart channel subunit. In this review article, after a brief clinical description of the muscular and cardiac channelopathies related to Nav1.4 and Nav1.5 mutations, respectively, we compare the knowledge accumulated in different aspects of the expression and function of Nav1.4 and Nav1.5 α-subunits: the regulation of the two encoding genes (SCN4A and SCN5A), the associated/regulatory proteins and at last, the functional effect of the same missense mutations detected in Nav1.4 and Nav1.5. First, it appears that more is known on Nav1.5 expression and accessory proteins. Because of the high homologies of Nav1.5 binding sites and equivalent Nav1.4 sites, Nav1.5-related results may guide future investigations on Nav1.4. Second, the analysis of the same missense mutations in Nav1.4 and Nav1.5 revealed intriguing similarities regarding their effects on membrane excitability and alteration in channel biophysics. We believe that such comparison may bring new cues to the physiopathology of cardiac and muscular diseases.
Collapse
Affiliation(s)
- Gildas Loussouarn
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, l'Institut du ThoraxNantes, France; Centre National de la Recherche Scientifique, UMR 6291Nantes, France; Université de NantesNantes, France
| | - Damien Sternberg
- Institut National de la Santé et de la Recherche Médicale, U1127Paris, France; Sorbonne Universités, Université Pierre-et-Marie-Curie, UMR S1127Paris, France; Centre National de la Recherche Scientifique, UMR 7225Paris, France; Institut du Cerveau et de la Moelle Épinière, ICMParis, France; Assistance Publique - Hôpitaux de Paris (AP-HP), Centres de Référence des Canalopathies Musculaires et des Maladies Neuro-musculaires Paris-EstParis, France; Assistance Publique - Hôpitaux de Paris (AP-HP), Hôpital de la Pitié Salpêtrière, Service de Biochimie Métabolique, Unité de Cardiogénétique et MyogénétiqueParis, France
| | - Sophie Nicole
- Institut National de la Santé et de la Recherche Médicale, U1127Paris, France; Sorbonne Universités, Université Pierre-et-Marie-Curie, UMR S1127Paris, France; Centre National de la Recherche Scientifique, UMR 7225Paris, France; Institut du Cerveau et de la Moelle Épinière, ICMParis, France
| | - Céline Marionneau
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, l'Institut du ThoraxNantes, France; Centre National de la Recherche Scientifique, UMR 6291Nantes, France; Université de NantesNantes, France
| | - Francoise Le Bouffant
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, l'Institut du ThoraxNantes, France; Centre National de la Recherche Scientifique, UMR 6291Nantes, France; Université de NantesNantes, France
| | - Gilles Toumaniantz
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, l'Institut du ThoraxNantes, France; Centre National de la Recherche Scientifique, UMR 6291Nantes, France; Université de NantesNantes, France
| | - Julien Barc
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, l'Institut du ThoraxNantes, France; Centre National de la Recherche Scientifique, UMR 6291Nantes, France; Université de NantesNantes, France
| | - Olfat A Malak
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, l'Institut du ThoraxNantes, France; Centre National de la Recherche Scientifique, UMR 6291Nantes, France; Université de NantesNantes, France
| | - Véronique Fressart
- Assistance Publique - Hôpitaux de Paris (AP-HP), Hôpital de la Pitié Salpêtrière, Service de Biochimie Métabolique, Unité de Cardiogénétique et Myogénétique Paris, France
| | - Yann Péréon
- Centre Hospitalier Universitaire de Nantes, Centre de Référence Maladies Neuromusculaires Nantes-AngersNantes, France; Atlantic Gene Therapies - Biotherapy Institute for Rare DiseasesNantes, France
| | - Isabelle Baró
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, l'Institut du ThoraxNantes, France; Centre National de la Recherche Scientifique, UMR 6291Nantes, France; Université de NantesNantes, France
| | - Flavien Charpentier
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, l'Institut du ThoraxNantes, France; Centre National de la Recherche Scientifique, UMR 6291Nantes, France; Université de NantesNantes, France; Centre Hospitalier Universitaire de Nantes, l'Institut du ThoraxNantes, France
| |
Collapse
|
32
|
Jouni M, Si-Tayeb K, Es-Salah-Lamoureux Z, Latypova X, Champon B, Caillaud A, Rungoat A, Charpentier F, Loussouarn G, Baró I, Zibara K, Lemarchand P, Gaborit N. Toward Personalized Medicine: Using Cardiomyocytes Differentiated From Urine-Derived Pluripotent Stem Cells to Recapitulate Electrophysiological Characteristics of Type 2 Long QT Syndrome. J Am Heart Assoc 2015; 4:e002159. [PMID: 26330336 PMCID: PMC4599503 DOI: 10.1161/jaha.115.002159] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Background Human genetically inherited cardiac diseases have been studied mainly in heterologous systems or animal models, independent of patients’ genetic backgrounds. Because sources of human cardiomyocytes (CMs) are extremely limited, the use of urine samples to generate induced pluripotent stem cell–derived CMs would be a noninvasive method to identify cardiac dysfunctions that lead to pathologies within patients’ specific genetic backgrounds. The objective was to validate the use of CMs differentiated from urine-derived human induced pluripotent stem (UhiPS) cells as a new cellular model for studying patients’ specific arrhythmia mechanisms. Methods and Results Cells obtained from urine samples of a patient with long QT syndrome who harbored the HERG A561P gene mutation and his asymptomatic noncarrier mother were reprogrammed using the episomal-based method. UhiPS cells were then differentiated into CMs using the matrix sandwich method. UhiPS-CMs showed proper expression of atrial and ventricular myofilament proteins and ion channels. They were electrically functional, with nodal-, atrial- and ventricular-like action potentials recorded using high-throughput optical and patch-clamp techniques. Comparison of HERG expression from the patient’s UhiPS-CMs to the mother’s UhiPS-CMs showed that the mutation led to a trafficking defect that resulted in reduced delayed rectifier K+ current (IKr). This phenotype gave rise to action potential prolongation and arrhythmias. Conclusions UhiPS cells from patients carrying ion channel mutations can be used as novel tools to differentiate functional CMs that recapitulate cardiac arrhythmia phenotypes.
Collapse
Affiliation(s)
- Mariam Jouni
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) ER045, PRASE, Laboratory of Stem Cells, Lebanese University, Beirut, Lebanon (M.J., K.Z.)
| | - Karim Si-Tayeb
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Zeineb Es-Salah-Lamoureux
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Xenia Latypova
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Benoite Champon
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Amandine Caillaud
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Anais Rungoat
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Flavien Charpentier
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Gildas Loussouarn
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Isabelle Baró
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Kazem Zibara
- ER045, PRASE, Laboratory of Stem Cells, Lebanese University, Beirut, Lebanon (M.J., K.Z.)
| | - Patricia Lemarchand
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| | - Nathalie Gaborit
- Inserm, UMR 1087, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CNRS, UMR 6291, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) Université de Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.) CHU Nantes, l'institut du thorax, Nantes, France (M.J., K.S.T., Z.E.S.L., X.L., B.C., A.C., A.R., F.C., G.L., I.B., P.L., N.G.)
| |
Collapse
|
33
|
Moreno C, de la Cruz A, Oliveras A, Kharche SR, Guizy M, Comes N, Starý T, Ronchi C, Rocchetti M, Baró I, Loussouarn G, Zaza A, Severi S, Felipe A, Valenzuela C. Marine n-3 PUFAs modulate IKs gating, channel expression, and location in membrane microdomains. Cardiovasc Res 2014; 105:223-32. [PMID: 25497550 DOI: 10.1093/cvr/cvu250] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AIMS Polyunsaturated fatty n-3 acids (PUFAs) have been reported to exhibit antiarrhythmic properties. However, the mechanisms of action remain unclear. We studied the electrophysiological effects of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on IKs, and on the expression and location of Kv7.1 and KCNE1. METHODS AND RESULTS Experiments were performed using patch-clamp, western blot, and sucrose gradient techniques in COS7 cells transfected with Kv7.1/KCNE1 channels. Acute perfusion with both PUFAs increased Kv7.1/KCNE1 current, this effect being greater for DHA than for EPA. Similar results were found in guinea pig cardiomyocytes. Acute perfusion of either PUFA slowed the activation kinetics and EPA shifted the activation curve to the left. Conversely, chronic EPA did not modify Kv7.1/KCNE1 current magnitude and shifted the activation curve to the right. Chronic PUFAs decreased the expression of Kv7.1, but not of KCNE1, and induced spatial redistribution of Kv7.1 over the cell membrane. Cholesterol depletion with methyl-β-cyclodextrin increased Kv7.1/KCNE1 current magnitude. Under these conditions, acute EPA produced similar effects than those induced in non-cholesterol-depleted cells. A ventricular action potential computational model suggested antiarrhythmic efficacy of acute PUFA application under IKr block. CONCLUSIONS We provide evidence that acute application of PUFAs increases Kv7.1/KCNE1 through a probably direct effect, and shows antiarrhythmic efficacy under IKr block. Conversely, chronic EPA application modifies the channel activity through a change in the Kv7.1/KCNE1 voltage-dependence, correlated with a redistribution of Kv7.1 over the cell membrane. This loss of function may be pro-arrhythmic. This shed light on the controversial effects of PUFAs regarding arrhythmias.
Collapse
Affiliation(s)
- Cristina Moreno
- Instituto de Investigaciones Biomédicas 'Alberto Sols' CSIC-UAM, C/Arturo Duperier 4, 28029 Madrid, Spain
| | - Alicia de la Cruz
- Instituto de Investigaciones Biomédicas 'Alberto Sols' CSIC-UAM, C/Arturo Duperier 4, 28029 Madrid, Spain
| | - Anna Oliveras
- Molecular Physiology Laboratory, Departament de Bioquímica i Biologia Molecular, Institut de Biomedicina (IBUB), Universitat de Barcelona, Barcelona, Spain
| | - Sanjay R Kharche
- Biomedical Engineering Laboratory D.E.I.S., University of Bologna, 47521 Cesena, Italy
| | - Miriam Guizy
- Instituto de Investigaciones Biomédicas 'Alberto Sols' CSIC-UAM, C/Arturo Duperier 4, 28029 Madrid, Spain
| | - Nùria Comes
- Molecular Physiology Laboratory, Departament de Bioquímica i Biologia Molecular, Institut de Biomedicina (IBUB), Universitat de Barcelona, Barcelona, Spain
| | - Tomáš Starý
- Biomedical Engineering Laboratory D.E.I.S., University of Bologna, 47521 Cesena, Italy
| | - Carlotta Ronchi
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Marcella Rocchetti
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Isabelle Baró
- L'Institut du Thorax, Unité Inserm UMR 1087/CNRS UMR 6291, Nantes, France
| | - Gildas Loussouarn
- L'Institut du Thorax, Unité Inserm UMR 1087/CNRS UMR 6291, Nantes, France
| | - Antonio Zaza
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Stefano Severi
- Biomedical Engineering Laboratory D.E.I.S., University of Bologna, 47521 Cesena, Italy
| | - Antonio Felipe
- Molecular Physiology Laboratory, Departament de Bioquímica i Biologia Molecular, Institut de Biomedicina (IBUB), Universitat de Barcelona, Barcelona, Spain
| | - Carmen Valenzuela
- Instituto de Investigaciones Biomédicas 'Alberto Sols' CSIC-UAM, C/Arturo Duperier 4, 28029 Madrid, Spain
| |
Collapse
|
34
|
|
35
|
Portero V, Le Scouarnec S, Es-Salah-Lamoureux Z, Burel S, Gourraud J, Bonnaud S, Lindenbaum P, Simonet F, Violleau J, Sandoval-Tortosa J, Scott C, Chatel S, Loussouarn G, O’Hara T, Mabo P, Dina C, Le Marec H, Schott J, Probst V, Baró I, Marionneau C, Charpentier F, Redon R. GAIN-OF-FUNCTION MUTATION IN THE VOLTAGE-GATED K+ CHANNEL BETA-2 SUBUNIT IS ASSOCIATED WITH BRUGADA SYNDROME. Heart Rhythm 2014. [DOI: 10.1016/j.hrthm.2014.09.024] [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] [Indexed: 10/24/2022]
|
36
|
Béziau DM, Barc J, O'Hara T, Le Gloan L, Amarouch MY, Solnon A, Pavin D, Lecointe S, Bouillet P, Gourraud JB, Guicheney P, Denjoy I, Redon R, Mabo P, le Marec H, Loussouarn G, Kyndt F, Schott JJ, Probst V, Baró I. Complex Brugada syndrome inheritance in a family harbouring compound SCN5A and CACNA1C mutations. Basic Res Cardiol 2014; 109:446. [PMID: 25341504 DOI: 10.1007/s00395-014-0446-5] [Citation(s) in RCA: 14] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 09/19/2014] [Accepted: 10/09/2014] [Indexed: 12/19/2022]
Abstract
Brugada syndrome (BrS) is characterized by ST-segment elevation in the right precordial leads and is associated with increased risk of sudden cardiac death. We have recently reported families with BrS and SCN5A mutations where some affected members do not carry the familial mutation. We evaluated the involvement of additional genetic determinants for BrS in an affected family. We identified three distinct gene variants within a family presenting BrS (5 individuals), cardiac conduction defects (CCD, 3 individuals) and shortened QT interval (4 individuals). The first mutation is nonsense, p.Q1695*, lying within the SCN5A gene, which encodes for NaV1.5, the α-subunit of the cardiac Na(+) channel. The second mutation is missense, p.N300D, and alters the CACNA1C gene, which encodes the α-subunit CaV1.2 of the L-type cardiac Ca(2+) channel. The SCN5A mutation strictly segregates with CCD. Four out of the 5 BrS patients carry the CACNA1C variant, and three of them present shortened QT interval. One of the BrS patients carries none of these mutations but a rare variant located in the ABCC9 gene as well as his asymptomatic mother. Patch-clamp studies identified a loss-of-function of the mutated CaV1.2 channel. Western-blot experiments showed a global expression defect while increased mobility of CaV1.2 channels on cell surface was revealed by FRAP experiments. Finally, computer simulations of the two mutations recapitulated patient phenotypes. We report a rare CACNA1C mutation as causing BrS and/or shortened QT interval in a family also carrying a SCN5A stop mutation, but which does not segregate with BrS. This study underlies the complexity of BrS inheritance and its pre-symptomatic genetic screening interpretation.
Collapse
Affiliation(s)
- Delphine M Béziau
- INSERM, UMR 1087, l'institut du thorax, 8 Quai Moncousu, BP 70721, 44007, Nantes cedex 1, France
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Liu C, Yang J, Qu L, Gu M, Liu Y, Gao J, Collaudin C, Loussouarn G. Changes in Chinese hair growth along a full year. Int J Cosmet Sci 2014; 36:531-6. [DOI: 10.1111/ics.12151] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 06/15/2014] [Indexed: 11/27/2022]
Affiliation(s)
- C. Liu
- L'Oréal R & I; Jinyu Rd No. 550 Shanghai 201206 China
| | - J. Yang
- L'Oréal R & I; Jinyu Rd No. 550 Shanghai 201206 China
| | - L. Qu
- L'Oréal R & I; Jinyu Rd No. 550 Shanghai 201206 China
| | - M. Gu
- L'Oréal R & I; Jinyu Rd No. 550 Shanghai 201206 China
| | - Y. Liu
- L'Oréal R & I; Jinyu Rd No. 550 Shanghai 201206 China
| | - J. Gao
- L'Oréal R & I; Jinyu Rd No. 550 Shanghai 201206 China
| | - C. Collaudin
- L'Oréal R & I; 20120611-13 rue Dora Maar Saint-Ouen 93400 France
| | - G. Loussouarn
- L'Oréal R & I; 20120611-13 rue Dora Maar Saint-Ouen 93400 France
| |
Collapse
|
38
|
Coyan FC, Abderemane-Ali F, Amarouch MY, Piron J, Mordel J, Nicolas CS, Steenman M, Mérot J, Marionneau C, Thomas A, Brasseur R, Baró I, Loussouarn G. A long QT mutation substitutes cholesterol for phosphatidylinositol-4,5-bisphosphate in KCNQ1 channel regulation. PLoS One 2014; 9:e93255. [PMID: 24681627 PMCID: PMC3969324 DOI: 10.1371/journal.pone.0093255] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [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: 06/11/2013] [Accepted: 03/03/2014] [Indexed: 01/08/2023] Open
Abstract
Introduction Phosphatidylinositol-4,5-bisphosphate (PIP2) is a cofactor necessary for the activity of KCNQ1 channels. Some Long QT mutations of KCNQ1, including R243H, R539W and R555C have been shown to decrease KCNQ1 interaction with PIP2. A previous study suggested that R539W is paradoxically less sensitive to intracellular magnesium inhibition than the WT channel, despite a decreased interaction with PIP2. In the present study, we confirm this peculiar behavior of R539W and suggest a molecular mechanism underlying it. Methods and Results COS-7 cells were transfected with WT or mutated KCNE1-KCNQ1 channel, and patch-clamp recordings were performed in giant-patch, permeabilized-patch or ruptured-patch configuration. Similar to other channels with a decreased PIP2 affinity, we observed that the R243H and R555C mutations lead to an accelerated current rundown when membrane PIP2 levels are decreasing. As opposed to R243H and R555C mutants, R539W is not more but rather less sensitive to PIP2 decrease than the WT channel. A molecular model of a fragment of the KCNQ1 C-terminus and the membrane bilayer suggested that a potential novel interaction of R539W with cholesterol stabilizes the channel opening and hence prevents rundown upon PIP2 depletion. We then carried out the same rundown experiments under cholesterol depletion and observed an accelerated R539W rundown that is consistent with this model. Conclusions We show for the first time that a mutation may shift the channel interaction with PIP2 to a preference for cholesterol. This de novo interaction wanes the sensitivity to PIP2 variations, showing that a mutated channel with a decreased affinity to PIP2 could paradoxically present a slowed current rundown compared to the WT channel. This suggests that caution is required when using measurements of current rundown as an indicator to compare WT and mutant channel PIP2 sensitivity.
Collapse
Affiliation(s)
- Fabien C. Coyan
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
| | - Fayal Abderemane-Ali
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
| | - Mohamed Yassine Amarouch
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
| | - Julien Piron
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
| | - Jérôme Mordel
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
| | - Céline S. Nicolas
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
| | - Marja Steenman
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
| | - Jean Mérot
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
| | - Céline Marionneau
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
| | - Annick Thomas
- Institut de Pharmacologie et de Biologie Structurale, Centre National de la Recherche Scientifique, Toulouse, France
| | - Robert Brasseur
- Centre de Biophysique Moléculaire Numérique, University of Liège, Gembloux, Belgium
| | - Isabelle Baró
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
| | - Gildas Loussouarn
- l'institut du thorax, Institut National de la Santé et de la Recherche Médicale, Nantes, France
- Unité Mixte de Recherche 6291, Centre National de la Recherche Scientifique, Nantes, France
- Unité de Formation et de Recherche de Médecine, Université de Nantes, Nantes, France
- * E-mail:
| |
Collapse
|
39
|
Findeisen F, Shaya D, Abderemane-Ali F, Arrigoni C, Loussouarn G, Minor DL. Identification of a Determinant of High Affinity Calcium Binding in the Selectivity Filter of a Mammalian Calcium Channel. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.1900] [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: 10/23/2022] Open
|
40
|
Arrigoni C, Shaya D, Findeisen F, Abdermane-Ali F, Loussouarn G, Minor DL. Structure of a Prokaryotic Sodium Channel Pore Reveals Essential Gating Elements and an Outer Ion Binding Site Common to Eukaryotic Channels. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.766] [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] Open
|
41
|
Abriel H, de Lange E, Kucera JP, Loussouarn G, Tarek M. Computational tools to investigate genetic cardiac channelopathies. Front Physiol 2013; 4:390. [PMID: 24421770 PMCID: PMC3872783 DOI: 10.3389/fphys.2013.00390] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Accepted: 12/10/2013] [Indexed: 12/19/2022] Open
Abstract
The aim of this perspective article is to share with the community of ion channel scientists our thoughts and expectations regarding the increasing role that computational tools will play in the future of our field. The opinions and comments detailed here are the result of a 3-day long international exploratory workshop that took place in October 2013 and that was supported by the Swiss National Science Foundation.
Collapse
Affiliation(s)
- Hugues Abriel
- Department of Clinical Research, University of Bern Bern, Switzerland
| | - Enno de Lange
- Department of Knowledge Engineering, Maastricht University Maastricht, Netherlands
| | - Jan P Kucera
- Department of Physiology, University of Bern Bern, Switzerland
| | - Gildas Loussouarn
- INSERM, UMR 1087, l'Institut du thorax Nantes, France ; Centre National de la Recherche Scientifique, L'Institut du Thorax, UMR 6921 Nantes, France ; L'Institut du Thorax, UMR 6921, Université de Nantes Nantes, France
| | - Mounir Tarek
- Theory, Modeling and Simulations, UMR 7565, Université de Lorraine Vandoeuvre-lés-Nancy, France ; Theory, Modeling and Simulations, UMR 7565, Centre National de la Recherche Scientifique Vandoeuvre-lés-Nancy, France
| |
Collapse
|
42
|
Shaya D, Findeisen F, Abderemane-Ali F, Arrigoni C, Wong S, Nurva SR, Loussouarn G, Minor DL. Structure of a prokaryotic sodium channel pore reveals essential gating elements and an outer ion binding site common to eukaryotic channels. J Mol Biol 2013; 426:467-83. [PMID: 24120938 DOI: 10.1016/j.jmb.2013.10.010] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [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] [Received: 07/24/2013] [Revised: 09/20/2013] [Accepted: 10/05/2013] [Indexed: 12/18/2022]
Abstract
Voltage-gated sodium channels (NaVs) are central elements of cellular excitation. Notwithstanding advances from recent bacterial NaV (BacNaV) structures, key questions about gating and ion selectivity remain. Here, we present a closed conformation of NaVAe1p, a pore-only BacNaV derived from NaVAe1, a BacNaV from the arsenite oxidizer Alkalilimnicola ehrlichei found in Mono Lake, California, that provides insight into both fundamental properties. The structure reveals a pore domain in which the pore-lining S6 helix connects to a helical cytoplasmic tail. Electrophysiological studies of full-length BacNaVs show that two elements defined by the NaVAe1p structure, an S6 activation gate position and the cytoplasmic tail "neck", are central to BacNaV gating. The structure also reveals the selectivity filter ion entry site, termed the "outer ion" site. Comparison with mammalian voltage-gated calcium channel (CaV) selectivity filters, together with functional studies, shows that this site forms a previously unknown determinant of CaV high-affinity calcium binding. Our findings underscore commonalities between BacNaVs and eukaryotic voltage-gated channels and provide a framework for understanding gating and ion permeation in this superfamily.
Collapse
Affiliation(s)
- David Shaya
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158-9001, USA
| | - Felix Findeisen
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158-9001, USA
| | - Fayal Abderemane-Ali
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, F-44000 Nantes, France; Centre National de la Recherche Scientifique, UMR 6291, F-44000 Nantes, France; L'institut du thorax, L'UNAM, Université de Nantes, F-44000 Nantes, France
| | - Cristina Arrigoni
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158-9001, USA
| | - Stephanie Wong
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158-9001, USA
| | - Shailika Reddy Nurva
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158-9001, USA
| | - Gildas Loussouarn
- Institut National de la Santé et de la Recherche Médicale, UMR 1087, F-44000 Nantes, France; Centre National de la Recherche Scientifique, UMR 6291, F-44000 Nantes, France; L'institut du thorax, L'UNAM, Université de Nantes, F-44000 Nantes, France
| | - Daniel L Minor
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158-9001, USA; Departments of Biochemistry and Biophysics and Cellular and Molecular Pharmacology, University of California, San Francisco, CA 94158-9001, USA; California Institute for Quantitative Biomedical Research, University of California, San Francisco, CA 94158-9001, USA; Physical Biosciences Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
| |
Collapse
|
43
|
Abderemane-Ali F, Es-Salah-Lamoureux Z, Delemotte L, Kasimova MA, Labro AJ, Snyders DJ, Fedida D, Tarek M, Baró I, Loussouarn G. Dual Effect of PIP2 on Shaker K+ Channels. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.2567] [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: 11/26/2022] Open
|
44
|
Loussouarn G, Tarek M. Mechanisms of Ion Channels Voltage-Dependency: All about Molecular Sensors, Gates, Levers, Locks, and Grease. Front Pharmacol 2012; 3:174. [PMID: 23060794 PMCID: PMC3459010 DOI: 10.3389/fphar.2012.00174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 09/11/2012] [Indexed: 11/13/2022] Open
Affiliation(s)
- Gildas Loussouarn
- Institut National de la Santé et de la Recherche Médicale, UMR1087 Nantes, France ; Centre National de la Recherche Scientifique, UMR 6291 Nantes, France ; L'institut du Thorax, L'UNAM Université, Université de Nantes Nantes, France
| | | |
Collapse
|
45
|
Affiliation(s)
- S Panhard
- L'Oréal, Research & Innovation, 11-13 rue Dora Maar, 93400 Saint-Ouen, France.
| | | | | |
Collapse
|
46
|
Abderemane-Ali F, Es-Salah-Lamoureux Z, Delemotte L, Kasimova MA, Labro AJ, Snyders DJ, Fedida D, Tarek M, Baró I, Loussouarn G. Dual effect of phosphatidylinositol (4,5)-bisphosphate PIP(2) on Shaker K(+) [corrected] channels. J Biol Chem 2012; 287:36158-67. [PMID: 22932893 DOI: 10.1074/jbc.m112.382085] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Phosphatidylinositol (4,5)-bisphosphate (PIP(2)) is a phospholipid of the plasma membrane that has been shown to be a key regulator of several ion channels. Functional studies and more recently structural studies of Kir channels have revealed the major impact of PIP(2) on the open state stabilization. A similar effect of PIP(2) on the delayed rectifiers Kv7.1 and Kv11.1, two voltage-gated K(+) channels, has been suggested, but the molecular mechanism remains elusive and nothing is known on PIP(2) effect on other Kv such as those of the Shaker family. By combining giant-patch ionic and gating current recordings in COS-7 cells, and voltage-clamp fluorimetry in Xenopus oocytes, both heterologously expressing the voltage-dependent Shaker channel, we show that PIP(2) exerts 1) a gain-of-function effect on the maximal current amplitude, consistent with a stabilization of the open state and 2) a loss-of-function effect by positive-shifting the activation voltage dependence, most likely through a direct effect on the voltage sensor movement, as illustrated by molecular dynamics simulations.
Collapse
|
47
|
Choveau FS, Abderemane-Ali F, Coyan FC, Es-Salah-Lamoureux Z, Baró I, Loussouarn G. Opposite Effects of the S4-S5 Linker and PIP(2) on Voltage-Gated Channel Function: KCNQ1/KCNE1 and Other Channels. Front Pharmacol 2012; 3:125. [PMID: 22787448 PMCID: PMC3389672 DOI: 10.3389/fphar.2012.00125] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 06/14/2012] [Indexed: 01/16/2023] Open
Abstract
Voltage-gated potassium (Kv) channels are tetramers, each subunit presenting six transmembrane segments (S1-S6), with each S1-S4 segments forming a voltage-sensing domain (VSD) and the four S5-S6 forming both the conduction pathway and its gate. S4 segments control the opening of the intracellular activation gate in response to changes in membrane potential. Crystal structures of several voltage-gated ion channels in combination with biophysical and mutagenesis studies highlighted the critical role of the S4-S5 linker (S4S5(L)) and of the S6 C-terminal part (S6(T)) in the coupling between the VSD and the activation gate. Several mechanisms have been proposed to describe the coupling at a molecular scale. This review summarizes the mechanisms suggested for various voltage-gated ion channels, including a mechanism that we described for KCNQ1, in which S4S5(L) is acting like a ligand binding to S6(T) to stabilize the channel in a closed state. As discussed in this review, this mechanism may explain the reverse response to depolarization in HCN-like channels. As opposed to S4S5(L), the phosphoinositide, phosphatidylinositol 4,5-bisphosphate (PIP(2)), stabilizes KCNQ1 channel in an open state. Many other ion channels (not only voltage-gated) require PIP(2) to function properly, confirming its crucial importance as an ion channel cofactor. This is highlighted in cases in which an altered regulation of ion channels by PIP(2) leads to channelopathies, as observed for KCNQ1. This review summarizes the state of the art on the two regulatory mechanisms that are critical for KCNQ1 and other voltage-gated channels function (PIP(2) and S4S5(L)), and assesses their potential physiological and pathophysiological roles.
Collapse
Affiliation(s)
- Frank S Choveau
- UMR 1087, Institut National de la Santé et de la Recherche Médicale Nantes, France
| | | | | | | | | | | |
Collapse
|
48
|
Laurent G, Saal S, Amarouch MY, Béziau DM, Marsman RF, Faivre L, Barc J, Dina C, Bertaux G, Barthez O, Thauvin-Robinet C, Charron P, Fressart V, Maltret A, Villain E, Baron E, Mérot J, Turpault R, Coudière Y, Charpentier F, Schott JJ, Loussouarn G, Wilde AA, Wolf JE, Baró I, Kyndt F, Probst V. Multifocal Ectopic Purkinje-Related Premature Contractions. J Am Coll Cardiol 2012; 60:144-56. [DOI: 10.1016/j.jacc.2012.02.052] [Citation(s) in RCA: 124] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2011] [Revised: 01/19/2012] [Accepted: 02/14/2012] [Indexed: 11/29/2022]
|
49
|
Laurent G, Saal S, Yassine Amarouch M, Beziau D, Marsman RF, Dina C, Charron P, Maltret A, Turpault R, Wilde AA, Eric Wolf J, Loussouarn G, Kyndt F, Probst V, Baro I. R222Q Nav1.5 Mutation Associated with a New SCN5A-Related Cardiac Arrhythmia. Biophys J 2012. [DOI: 10.1016/j.bpj.2011.11.2879] [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: 11/15/2022] Open
|
50
|
Commo S, Wakamatsu K, Lozano I, Panhard S, Loussouarn G, Bernard B, Ito S. Age-dependent changes in eumelanin composition in hairs of various ethnic origins. Int J Cosmet Sci 2011; 34:102-7. [DOI: 10.1111/j.1468-2494.2011.00691.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|