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Seghers F, Delongie KA, Wallemacq P, Labriola L. Measurement of Hydroxychloroquine Clearance in Intermittent Hemodialysis. Am J Ther 2023; 30:e400-e402. [PMID: 37449933 DOI: 10.1097/mjt.0000000000001474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Affiliation(s)
| | - Kévin-Alexandre Delongie
- Clinical Chemistry, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Pierre Wallemacq
- Clinical Chemistry, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Laura Labriola
- Departments of Nephrology and
- Institut de Recherche Expériementale et Clinique (IREC), Pôle de Néphrologie, Université catholique de Louvain, Brussels, Belgium
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Labriola L, Ruelle J, Scohy A, Seghers F, Perlot Q, De Greef J, Desmet C, Romain C, Yombi JC, Rodriguez-Villalobos H, Kabamba B, Jadoul M. Dynamics of spreading of SARS-CoV-2 in a Belgian hemodialysis facility: The importance of the analysis of viral strains. J Med Virol 2021; 94:1481-1487. [PMID: 34811754 PMCID: PMC9011566 DOI: 10.1002/jmv.27471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 11/11/2021] [Accepted: 11/21/2021] [Indexed: 11/24/2022]
Abstract
In‐center maintenance hemodialysis (HD) patients are at high risk of acquiring coronavirus disease 2019 (COVID‐19) by cross‐contamination inside the unit. The aim of this study was to assess retrospectively the dynamics of severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) transmission during the very first pandemic phase (March–July 2020) in a cohort of in‐center maintenance HD patients and in nurses the same HD facility, using a phylogenetic approach. All SARS‐CoV‐2 quantitative reverse‐transcription polymerase chain reaction positive patients and nurses from our HD unit‐respectively 10 out of 98, and 8 out of 58‐ and two other positive patients dialyzed in our self‐care unit were included. Whole‐genome viral sequencing and phylogenetic analysis supported the cluster investigation. Five positive patients were usually dialyzed in the same room and same shift before their COVID‐19 diagnosis was made. Viral sequencing performed on 4/5 patients' swabs showed no phylogenetic link between their viruses. The fifth patient (whose virus could not be sequenced) was dialyzed at the end of the dialysis room and was treated by a different nurse than the one in charge of the other patients. Three nurses shared the same virus detected in both self‐care patients (one of them had been transferred to our in‐center facility). The epidemiologically strongly suspected intra‐unit cluster could be ruled out by viral genome sequencing. The infection control policy did not allow inter‐patient contamination within the HD facility, in contrast to evidence of moderate dissemination within the nursing staff and in the satellite unit. Epidemiologic data without phylogenetic confirmation might mislead the interpretation of the dynamics of viral spreading within congregate settings. In‐center maintenance hemodialysis (HD) patients are at high risk of acquiring coronavirus disease 2019 by cross‐contamination inside the unit. In this study we assessed the dynamics of severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) transmission in a cohort of in‐center maintenance hemodialysis patients and in nurses the same HD facility in Brussels, Belgium, using whole‐genome viral sequencing and phylogenetic analysis. All SARS‐CoV‐2 quantitative reverse‐transcription polymerase chain reaction (RT‐qPCR) positive patients (10 out 98) and nurses from our HD unit (8 out 58) and two other positive patients dialyzed in our self‐care unit were included. An intra‐unit cluster was suspected because five SARS‐CoV‐2 RT‐qPCR positive patients were dialyzed in the same room at the same time three times weekly. The epidemiologically strongly suspected intra‐unit cluster could be ruled out by viral genome sequencing. In contrast, three nurses shared the same virus detected in both self‐care patients (one of them had been transferred to our in‐center facility). Epidemiologic data without phylogenetic confirmation might mislead the interpretation of the dynamics of viral spreading within congregate settings.
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Affiliation(s)
- Laura Labriola
- Department of Nephrology, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium.,Institut de Recherche Expérimentale et Clinique (IREC), UCLouvain, Brussels, Belgium
| | - Jean Ruelle
- Pôle de Microbiologie Médicale (MBLG), UCLouvain, Brussels, Belgium.,Institut de Recherche Expérimentale et Clinique (IREC), UCLouvain, Brussels, Belgium
| | - Anaïs Scohy
- Pôle de Microbiologie Médicale (MBLG), UCLouvain, Brussels, Belgium.,Department of Microbiology, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium
| | - François Seghers
- Department of Nephrology, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium
| | - Quentin Perlot
- Department of Nephrology, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium
| | - Julien De Greef
- Department of Infectious Diseases, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium
| | - Christine Desmet
- Department of Nephrology, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium
| | - Cécile Romain
- Department of Nephrology, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium
| | - Jean Cyr Yombi
- Department of Infectious Diseases, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium.,Institut de Recherche Expérimentale et Clinique (IREC), UCLouvain, Brussels, Belgium
| | - Hector Rodriguez-Villalobos
- Pôle de Microbiologie Médicale (MBLG), UCLouvain, Brussels, Belgium.,Department of Microbiology, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium
| | - Benoît Kabamba
- Pôle de Microbiologie Médicale (MBLG), UCLouvain, Brussels, Belgium.,Department of Microbiology, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium
| | - Michel Jadoul
- Department of Nephrology, Cliniques Universitaires Saint-Luc, UCLouvain, Brussels, Belgium.,Institut de Recherche Expérimentale et Clinique (IREC), UCLouvain, Brussels, Belgium
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Labriola L, Scohy A, Seghers F, Perlot Q, De Greef J, Desmet C, Romain C, Morelle J, Yombi JC, Kabamba B, Rodriguez-Villalobos H, Jadoul M. A Longitudinal, 3-Month Serologic Assessment of SARS-CoV-2 Infections in a Belgian Hemodialysis Facility. Clin J Am Soc Nephrol 2021; 16:613-614. [PMID: 33208402 PMCID: PMC8092070 DOI: 10.2215/cjn.12490720] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Laura Labriola
- Department of Nephrology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium,Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels, Belgium
| | - Anaïs Scohy
- Department of Microbiology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - François Seghers
- Department of Nephrology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Quentin Perlot
- Department of Nephrology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Julien De Greef
- Department of Infectious Diseases, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Christine Desmet
- Department of Nephrology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Cécile Romain
- Department of Nephrology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Johann Morelle
- Department of Nephrology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium,Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels, Belgium
| | - Jean-Cyr Yombi
- Department of Infectious Diseases, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Benoît Kabamba
- Department of Microbiology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Hector Rodriguez-Villalobos
- Department of Microbiology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium
| | - Michel Jadoul
- Department of Nephrology, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels, Belgium,Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels, Belgium
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Gualdani R, Seghers F, Yerna X, Schakman O, Tajeddine N, Achouri Y, Tissir F, Devuyst O, Gailly P. Mechanical activation of TRPV4 channels controls albumin reabsorption by proximal tubule cells. Sci Signal 2020; 13:13/653/eabc6967. [DOI: 10.1126/scisignal.abc6967] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Defects in protein reabsorption by the proximal tubule are toxic for epithelial cells in the nephron and may result in nephropathy. In this study, we showed that the ion channel TRPV4 modulated the endocytosis of albumin and low–molecular weight proteins in the proximal tubule. TRPV4 was found at the basolateral side of proximal tubule cells, and its mechanical activation by cell stretching induced Ca2+ entry into the cytosol, which promoted endocytosis. Trpv4−/− mice presented with mild proximal tubule dysfunction under basal conditions. To challenge endocytic function, the permeability of the glomerular filter was altered by systemic delivery of angiotensin II. The proteinuria induced by this treatment was more severe in Trpv4−/− than in Trpv4+/+ mice. Injecting antibodies against the glomerular basement membrane to induce glomerulonephritis is a more pathophysiologically relevant method of impairing glomerular filter permeability. Albuminuria was more severe in mice that lacked TRPV4 specifically in the proximal tubule than in control mice. These results emphasize the importance of TRPV4 in sensing pressure in the proximal tubule in response to variations in the amount of ultrafiltrate and unveil a mechanism that controls protein reabsorption.
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Affiliation(s)
- Roberta Gualdani
- Université catholique de Louvain, Institute of Neuroscience, Cell Physiology, av. Mounier 53/B1.53.17, B-1200 Brussels, Belgium
| | - François Seghers
- Université catholique de Louvain, Institute of Neuroscience, Cell Physiology, av. Mounier 53/B1.53.17, B-1200 Brussels, Belgium
| | - Xavier Yerna
- Université catholique de Louvain, Institute of Neuroscience, Cell Physiology, av. Mounier 53/B1.53.17, B-1200 Brussels, Belgium
| | - Olivier Schakman
- Université catholique de Louvain, Institute of Neuroscience, Cell Physiology, av. Mounier 53/B1.53.17, B-1200 Brussels, Belgium
| | - Nicolas Tajeddine
- Université catholique de Louvain, Institute of Neuroscience, Cell Physiology, av. Mounier 53/B1.53.17, B-1200 Brussels, Belgium
| | - Younès Achouri
- Université catholique de Louvain, de Duve Institute, Transgenic Core Facility, av. Hippocrate 75/B1.75.09, B-1200 Brussels, Belgium
| | - Fadel Tissir
- Université catholique de Louvain, Institute of Neuroscience, Developmental Neurobiology, av. Hippocrate 73/B1.73.16, B-1200 Brussels, Belgium
| | - Olivier Devuyst
- University of Zurich, Institute of Physiology, Winterthurerstr. 190, CH-8057 Zurich, Switzerland
| | - Philippe Gailly
- Université catholique de Louvain, Institute of Neuroscience, Cell Physiology, av. Mounier 53/B1.53.17, B-1200 Brussels, Belgium
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Lepannetier S, Gualdani R, Tempesta S, Schakman O, Seghers F, Kreis A, Yerna X, Slimi A, de Clippele M, Tajeddine N, Voets T, Bon RS, Beech DJ, Tissir F, Gailly P. Activation of TRPC1 Channel by Metabotropic Glutamate Receptor mGluR5 Modulates Synaptic Plasticity and Spatial Working Memory. Front Cell Neurosci 2018; 12:318. [PMID: 30271326 PMCID: PMC6149316 DOI: 10.3389/fncel.2018.00318] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [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: 07/04/2018] [Accepted: 08/30/2018] [Indexed: 01/10/2023] Open
Abstract
Group I metabotropic glutamate receptors, in particular mGluR5, have been implicated in various forms of synaptic plasticity that are believed to underlie declarative memory. We observed that mGluR5 specifically activated a channel containing TRPC1, an isoform of the canonical family of transient receptor potential (TRPC) channels highly expressed in CA1-3 regions of the hippocampus. TRPC1 is able to form tetrameric complexes with TRPC4 and/or TRPC5 isoforms. TRPC1/4/5 complexes have recently been involved in the efficiency of synaptic transmission in the hippocampus. We therefore used a mouse model devoid of TRPC1 expression to investigate the involvement of mGluR5-TRPC1 pathway in synaptic plasticity and memory formation. Trpc1-/- mice showed alterations in spatial working memory and fear conditioning. Activation of mGluR increased synaptic excitability in neurons from WT but not from Trpc1-/- mice. LTP triggered by a theta burst could not maintain over time in brain slices from Trpc1-/- mice. mGluR-induced LTD was also impaired in these mice. Finally, acute inhibition of TRPC1 by Pico145 on isolated neurons or on brain slices mimicked the genetic depletion of Trpc1 and inhibited mGluR-induced entry of cations and subsequent effects on synaptic plasticity, excluding developmental or compensatory mechanisms in Trpc1-/- mice. In summary, our results indicate that TRPC1 plays a role in synaptic plasticity and spatial working memory processes.
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Affiliation(s)
- Sophie Lepannetier
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Roberta Gualdani
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Sabrina Tempesta
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Olivier Schakman
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - François Seghers
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Anna Kreis
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Xavier Yerna
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Amina Slimi
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Marie de Clippele
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Nicolas Tajeddine
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Thomas Voets
- Laboratory of Ion Channel Research (VIB-KU Leuven Center for Brain & Disease Research), Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, KU Leuven, Leuven, Belgium
| | - Robin S Bon
- School of Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom
| | - David J Beech
- School of Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom
| | - Fadel Tissir
- Developmental Neurobiology Group, Institute of NeuroScience, Université catholique de Louvain, Brussels, Belgium
| | - Philippe Gailly
- Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
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Seghers F, Yerna X, Zanou N, Devuyst O, Vennekens R, Nilius B, Gailly P. TRPV4 participates in pressure-induced inhibition of renin secretion by juxtaglomerular cells. J Physiol 2016; 594:7327-7340. [PMID: 27779758 DOI: 10.1113/jp273595] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 10/20/2016] [Indexed: 12/31/2022] Open
Abstract
KEY POINTS Increase in blood pressure in the renal afferent arteriole is known to induce an increase in cytosolic calcium concentration ([Ca2+ ]i ) of juxtaglomerular (JG) cells and to result in a decreased secretion of renin. Mechanical stimulation of As4.1 JG cells induces an increase in [Ca2+ ]i that is inhibited by HC067047 and RN1734, two inhibitors of TRPV4, or by siRNA-mediated repression of TRPV4. Inhibition of TRPV4 impairs pressure-induced decrease in renin secretion. Compared to wild-type mice, Trpv4-/- mice present increased resting plasma levels of renin and aldosterone and present a significantly altered pressure-renin relationship. We suggest that TRPV4 channel participates in mechanosensation at the juxtaglomerular apparatus. ABSTRACT The renin-angiotensin system is a crucial blood pressure regulation system. It consists of a hormonal cascade where the rate-limiting enzyme is renin, which is secreted into the blood flow by renal juxtaglomerular (JG) cells in response to low pressure in the renal afferent arteriole. In contrast, an increase in blood pressure results in a decreased renin secretion. This is accompanied by a transitory increase in [Ca2+ ]i of JG cells. The inverse relationship between [Ca2+ ]i and renin secretion has been called the 'calcium paradox' of renin release. How increased pressure induces a [Ca2+ ]i transient in JG cells, is however, unknown. We observed that [Ca2+ ]i transients induced by mechanical stimuli in JG As4.1 cells were completely abolished by HC067047 and RN1734, two inhibitors of TRPV4. They were also reduced by half by siRNA-mediated repression of TRPV4 but not after repression or inhibition of TRPV2 or Piezo1 ion channels. Interestingly, the stimulation of renin secretion by the adenylate cyclase activator forskolin was totally inhibited by cyclic stretching of the cells. This effect was mimicked by stimulation with GSK1016790A and 4αPDD, two activators of TRPV4 and inhibited in the presence of HC067047. Moreover, in isolated perfused kidneys from Trpv4-/- mice, the pressure-renin relationship was significantly altered. In vivo, Trpv4-/- mice presented increased plasma levels of renin and aldosterone compared to wild-type mice. Altogether, our results suggest that TRPV4 is involved in the pressure-induced entry of Ca2+ in JG cells, which inhibits renin release and allows the negative feedback regulation on blood pressure.
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Affiliation(s)
- François Seghers
- Université catholique de Louvain, Institute of Neuroscience, Laboratory of Cell Physiology, av. Mounier 53, box B1.53.17, B-1200, Brussels, Belgium
| | - Xavier Yerna
- Université catholique de Louvain, Institute of Neuroscience, Laboratory of Cell Physiology, av. Mounier 53, box B1.53.17, B-1200, Brussels, Belgium
| | - Nadège Zanou
- Université catholique de Louvain, Institute of Neuroscience, Laboratory of Cell Physiology, av. Mounier 53, box B1.53.17, B-1200, Brussels, Belgium
| | - Olivier Devuyst
- University of Zurich, Institute of Physiology, CH-8057, Zurich, Switzerland
| | - Rudi Vennekens
- Katholieke Universiteit Leuven, Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, B-3000, Leuven, Belgium
| | - Bernd Nilius
- Katholieke Universiteit Leuven, Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, B-3000, Leuven, Belgium
| | - Philippe Gailly
- Université catholique de Louvain, Institute of Neuroscience, Laboratory of Cell Physiology, av. Mounier 53, box B1.53.17, B-1200, Brussels, Belgium
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Zanou N, Mondin L, Fuster C, Seghers F, Dufour I, de Clippele M, Schakman O, Tajeddine N, Iwata Y, Wakabayashi S, Voets T, Allard B, Gailly P. Osmosensation in TRPV2 dominant negative expressing skeletal muscle fibres. J Physiol 2015; 593:3849-63. [PMID: 26108786 DOI: 10.1113/jp270522] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 06/19/2015] [Indexed: 11/08/2022] Open
Abstract
Increased plasma osmolarity induces intracellular water depletion and cell shrinkage (CS) followed by activation of a regulatory volume increase (RVI). In skeletal muscle, the hyperosmotic shock-induced CS is accompanied by a small membrane depolarization responsible for a release of Ca(2+) from intracellular pools. Hyperosmotic shock also induces phosphorylation of STE20/SPS1-related proline/alanine-rich kinase (SPAK). TRPV2 dominant negative expressing fibres challenged with hyperosmotic shock present a slower membrane depolarization, a diminished Ca(2+) response, a smaller RVI response, a decrease in SPAK phosphorylation and defective muscle function. We suggest that hyperosmotic shock induces TRPV2 activation, which accelerates muscle cell depolarization and allows the subsequent Ca(2+) release from the sarcoplasmic reticulum, activation of the Na(+) -K(+) -Cl(-) cotransporter by SPAK, and the RVI response. Increased plasma osmolarity induces intracellular water depletion and cell shrinkage followed by activation of a regulatory volume increase (RVI). In skeletal muscle, this is accompanied by transverse tubule (TT) dilatation and by a membrane depolarization responsible for a release of Ca(2+) from intracellular pools. We observed that both hyperosmotic shock-induced Ca(2+) transients and RVI were inhibited by Gd(3+) , ruthenium red and GsMTx4 toxin, three inhibitors of mechanosensitive ion channels. The response was also completely absent in muscle fibres overexpressing a non-permeant, dominant negative (DN) mutant of the transient receptor potential, V2 isoform (TRPV2) ion channel, suggesting the involvement of TRPV2 or of a TRP isoform susceptible to heterotetramerization with TRPV2. The release of Ca(2+) induced by hyperosmotic shock was increased by cannabidiol, an activator of TRPV2, and decreased by tranilast, an inhibitor of TRPV2, suggesting a role for the TRPV2 channel itself. Hyperosmotic shock-induced membrane depolarization was impaired in TRPV2-DN fibres, suggesting that TRPV2 activation triggers the release of Ca(2+) from the sarcoplasmic reticulum by depolarizing TTs. RVI requires the sequential activation of STE20/SPS1-related proline/alanine-rich kinase (SPAK) and NKCC1, a Na(+) -K(+) -Cl(-) cotransporter, allowing ion entry and driving osmotic water flow. In fibres overexpressing TRPV2-DN as well as in fibres in which Ca(2+) transients were abolished by the Ca(2+) chelator BAPTA, the level of P-SPAK(Ser373) in response to hyperosmotic shock was reduced, suggesting a modulation of SPAK phosphorylation by intracellular Ca(2+) . We conclude that TRPV2 is involved in osmosensation in skeletal muscle fibres, acting in concert with P-SPAK-activated NKCC1.
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Affiliation(s)
- Nadège Zanou
- Laboratory of Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, av. Mounier, B1.53.17, B-1200, Brussels, Belgium
| | - Ludivine Mondin
- Laboratory of Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, av. Mounier, B1.53.17, B-1200, Brussels, Belgium
| | - Clarisse Fuster
- Centre de Génétique et de Physiologie Cellulaire et Moléculaire, Université Claude Bernard Lyon 1, CNRS, UMR 5534, 69622, Villeurbanne, France
| | - François Seghers
- Laboratory of Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, av. Mounier, B1.53.17, B-1200, Brussels, Belgium
| | - Inès Dufour
- Laboratory of Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, av. Mounier, B1.53.17, B-1200, Brussels, Belgium
| | - Marie de Clippele
- Laboratory of Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, av. Mounier, B1.53.17, B-1200, Brussels, Belgium
| | - Olivier Schakman
- Laboratory of Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, av. Mounier, B1.53.17, B-1200, Brussels, Belgium
| | - Nicolas Tajeddine
- Laboratory of Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, av. Mounier, B1.53.17, B-1200, Brussels, Belgium
| | - Yuko Iwata
- Department of Molecular Physiology, National Cardiovascular Center Research Institute Suita, Osaka, 565-8565, Japan
| | - Shigeo Wakabayashi
- Department of Molecular Physiology, National Cardiovascular Center Research Institute Suita, Osaka, 565-8565, Japan
| | - Thomas Voets
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, Katholiek Universiteit Leuven, B-3000, Leuven, Belgium
| | - Bruno Allard
- Centre de Génétique et de Physiologie Cellulaire et Moléculaire, Université Claude Bernard Lyon 1, CNRS, UMR 5534, 69622, Villeurbanne, France
| | - Philippe Gailly
- Laboratory of Cell Physiology, Institute of Neuroscience, Université catholique de Louvain, av. Mounier, B1.53.17, B-1200, Brussels, Belgium
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