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Idoux R, Exbrayat-Héritier C, Sohm F, Jaque-Fernandez F, Vaganay E, Berthier C, Bretaud S, Jacquemond V, Ruggiero F, Allard B. A mechano- and heat-gated two-pore domain K + channel controls excitability in adult zebrafish skeletal muscle. Proc Natl Acad Sci U S A 2023; 120:e2305959120. [PMID: 37903280 PMCID: PMC10636360 DOI: 10.1073/pnas.2305959120] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 09/26/2023] [Indexed: 11/01/2023] Open
Abstract
TRAAK channels are mechano-gated two-pore-domain K+ channels. Up to now, activity of these channels has been reported in neurons but not in skeletal muscle, yet an archetype of tissue challenged by mechanical stress. Using patch clamp methods on isolated skeletal muscle fibers from adult zebrafish, we show here that single channels sharing properties of TRAAK channels, i.e., selective to K+ ions, of 56 pS unitary conductance in the presence of 5 mM external K+, activated by membrane stretch, heat, arachidonic acid, and internal alkaline pH, are present in enzymatically isolated fast skeletal muscle fibers from adult zebrafish. The kcnk4b transcript encoding for TRAAK channels was cloned and found, concomitantly with activity of mechano-gated K+ channels, to be absent in zebrafish fast skeletal muscles at the larval stage but arising around 1 mo of age. The transfer of the kcnk4b gene in HEK cells and in the adult mouse muscle, that do not express functional TRAAK channels, led to expression and activity of mechano-gated K+ channels displaying properties comparable to native zebrafish TRAAK channels. In whole-cell voltage-clamp and current-clamp conditions, membrane stretch and heat led to activation of macroscopic K+ currents and to acceleration of the repolarization phase of action potentials respectively, suggesting that heat production and membrane deformation associated with skeletal muscle activity can control muscle excitability through TRAAK channel activation. TRAAK channels may represent a teleost-specific evolutionary product contributing to improve swimming performance for escaping predators and capturing prey at a critical stage of development.
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Affiliation(s)
- Romane Idoux
- Physiopathologie et Génétique du Neurone et du Muscle, Université Claude Bernard Lyon 1, CNRS UMR 5261, INSERM U1315, Faculté de Médecine Rockefeller, Lyon69008, France
| | - Chloé Exbrayat-Héritier
- Institut de Génomique Fonctionnelle de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5242, Université Claude Bernard Lyon 1, Lyon69007, France
| | - Frédéric Sohm
- Institut de Génomique Fonctionnelle de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5242, Université Claude Bernard Lyon 1, Lyon69007, France
| | - Francisco Jaque-Fernandez
- Physiopathologie et Génétique du Neurone et du Muscle, Université Claude Bernard Lyon 1, CNRS UMR 5261, INSERM U1315, Faculté de Médecine Rockefeller, Lyon69008, France
| | - Elisabeth Vaganay
- Institut de Génomique Fonctionnelle de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5242, Université Claude Bernard Lyon 1, Lyon69007, France
| | - Christine Berthier
- Physiopathologie et Génétique du Neurone et du Muscle, Université Claude Bernard Lyon 1, CNRS UMR 5261, INSERM U1315, Faculté de Médecine Rockefeller, Lyon69008, France
| | - Sandrine Bretaud
- Institut de Génomique Fonctionnelle de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5242, Université Claude Bernard Lyon 1, Lyon69007, France
| | - Vincent Jacquemond
- Physiopathologie et Génétique du Neurone et du Muscle, Université Claude Bernard Lyon 1, CNRS UMR 5261, INSERM U1315, Faculté de Médecine Rockefeller, Lyon69008, France
| | - Florence Ruggiero
- Institut de Génomique Fonctionnelle de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5242, Université Claude Bernard Lyon 1, Lyon69007, France
| | - Bruno Allard
- Physiopathologie et Génétique du Neurone et du Muscle, Université Claude Bernard Lyon 1, CNRS UMR 5261, INSERM U1315, Faculté de Médecine Rockefeller, Lyon69008, France
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Jaque-Fernández F, Jorquera G, Troc-Gajardo J, Pietri-Rouxel F, Gentil C, Buvinic S, Allard B, Jaimovich E, Jacquemond V, Casas M. Pannexin-1 and CaV1.1 show reciprocal interaction during excitation-contraction and excitation-transcription coupling in skeletal muscle. J Gen Physiol 2021; 153:212695. [PMID: 34636893 PMCID: PMC8515650 DOI: 10.1085/jgp.202012635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/24/2021] [Accepted: 09/15/2021] [Indexed: 01/18/2023] Open
Abstract
One of the most important functions of skeletal muscle is to respond to nerve stimuli by contracting. This function ensures body movement but also participates in other important physiological roles, like regulation of glucose homeostasis. Muscle activity is closely regulated to adapt to different demands and shows a plasticity that relies on both transcriptional activity and nerve stimuli. These two processes, both dependent on depolarization of the plasma membrane, have so far been regarded as separated and independent processes due to a lack of evidence of common protein partners or molecular mechanisms. In this study, we reveal intimate functional interactions between the process of excitation-induced contraction and the process of excitation-induced transcriptional activity in skeletal muscle. We show that the plasma membrane voltage-sensing protein CaV1.1 and the ATP-releasing channel Pannexin-1 (Panx1) regulate each other in a reciprocal manner, playing roles in both processes. Specifically, knockdown of CaV1.1 produces chronically elevated extracellular ATP concentrations at rest, consistent with disruption of the normal control of Panx1 activity. Conversely, knockdown of Panx1 affects not only activation of transcription but also CaV1.1 function on the control of muscle fiber contraction. Altogether, our results establish the presence of bidirectional functional regulations between the molecular machineries involved in the control of contraction and transcription induced by membrane depolarization of adult muscle fibers. Our results are important for an integrative understanding of skeletal muscle function and may impact our understanding of several neuromuscular diseases.
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Affiliation(s)
- Francisco Jaque-Fernández
- Programa de Fisiología y Biofísica, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile
| | - Gonzalo Jorquera
- Programa de Fisiología y Biofísica, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile.,Centro de Neurobiología y Fisiopatología Integrativa, Instituto de Fisiología, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Jennifer Troc-Gajardo
- Programa de Fisiología y Biofísica, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile
| | - France Pietri-Rouxel
- Université Pierre et Marie Curie, Université Paris 06, Institut National de la Santé et de la Recherche Médicale/Centre National de la Recherche Scientifique/Institut de Myologie/Centre de Recherche en Myologie, Groupement hospitalier universitaire Pitié Salpêtrière, Paris, France
| | - Christel Gentil
- Université Pierre et Marie Curie, Université Paris 06, Institut National de la Santé et de la Recherche Médicale/Centre National de la Recherche Scientifique/Institut de Myologie/Centre de Recherche en Myologie, Groupement hospitalier universitaire Pitié Salpêtrière, Paris, France
| | - Sonja Buvinic
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago, Chile
| | - Bruno Allard
- Université Lyon, Université Claude Bernard Lyon 1, Centre National de la Recherche Scientifique UMR-5310, Institut National de la Santé et de la Recherche Médicale U-1217, Institut NeuroMyoGène, Lyon, France
| | - Enrique Jaimovich
- Programa de Fisiología y Biofísica, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile.,Center for Exercise, Metabolism and Cancer, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile
| | - Vincent Jacquemond
- Université Lyon, Université Claude Bernard Lyon 1, Centre National de la Recherche Scientifique UMR-5310, Institut National de la Santé et de la Recherche Médicale U-1217, Institut NeuroMyoGène, Lyon, France
| | - Mariana Casas
- Programa de Fisiología y Biofísica, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile.,Center for Exercise, Metabolism and Cancer, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile
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3
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Dystrophy-associated caveolin-3 mutations reveal that caveolae couple IL6/STAT3 signaling with mechanosensing in human muscle cells. Nat Commun 2019; 10:1974. [PMID: 31036801 PMCID: PMC6488599 DOI: 10.1038/s41467-019-09405-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 02/27/2019] [Indexed: 12/14/2022] Open
Abstract
Caveolin-3 is the major structural protein of caveolae in muscle. Mutations in the CAV3 gene cause different types of myopathies with altered membrane integrity and repair, expression of muscle proteins, and regulation of signaling pathways. We show here that myotubes from patients bearing the CAV3 P28L and R26Q mutations present a dramatic decrease of caveolae at the plasma membrane, resulting in abnormal response to mechanical stress. Mutant myotubes are unable to buffer the increase in membrane tension induced by mechanical stress. This results in impaired regulation of the IL6/STAT3 signaling pathway leading to its constitutive hyperactivation and increased expression of muscle genes. These defects are fully reversed by reassembling functional caveolae through expression of caveolin-3. Our study reveals that under mechanical stress the regulation of mechanoprotection by caveolae is directly coupled with the regulation of IL6/STAT3 signaling in muscle cells and that this regulation is absent in Cav3-associated dystrophic patients. Caveolae are mechanosensors and mutations of their coat proteins are implicated in muscle disorders, but molecular mechanisms are unclear. Here, the authors show that caveolae can regulate IL6/STAT3 signaling in muscle cells under stress, and that dystrophy related Cav3 mutant myotubes have reduced caveolae and upregulated IL6 signaling.
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Fuster C, Perrot J, Berthier C, Jacquemond V, Allard B. Elevated resting H + current in the R1239H type 1 hypokalaemic periodic paralysis mutated Ca 2+ channel. J Physiol 2017; 595:6417-6428. [PMID: 28857175 DOI: 10.1113/jp274638] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 08/28/2017] [Indexed: 12/19/2022] Open
Abstract
KEY POINTS Missense mutations in the gene encoding the α1 subunit of the skeletal muscle voltage-gated Ca2+ channel induce type 1 hypokalaemic periodic paralysis, a poorly understood neuromuscular disease characterized by episodic attacks of paralysis associated with low serum K+ . Acute expression of human wild-type and R1239H HypoPP1 mutant α1 subunits in mature mouse muscles showed that R1239H fibres displayed Ca2+ currents of reduced amplitude and larger resting leak inward current increased by external acidification. External acidification also produced intracellular acidification at a higher rate in R1239H fibres and inhibited inward rectifier K+ currents. These data suggest that the R1239H mutation induces an elevated leak H+ current at rest flowing through a gating pore and could explain why paralytic attacks preferentially occur during the recovery period following muscle exercise. ABSTRACT Missense mutations in the gene encoding the α1 subunit of the skeletal muscle voltage-gated Ca2+ channel induce type 1 hypokalaemic periodic paralysis, a poorly understood neuromuscular disease characterized by episodic attacks of paralysis associated with low serum K+ . The present study aimed at identifying the changes in muscle fibre electrical properties induced by acute expression of the R1239H hypokalaemic periodic paralysis human mutant α1 subunit of Ca2+ channels in a mature muscle environment to better understand the pathophysiological mechanisms involved in this disorder. We transferred genes encoding wild-type and R1239H mutant human Ca2+ channels into hindlimb mouse muscle by electroporation and combined voltage-clamp and intracellular pH measurements on enzymatically dissociated single muscle fibres. As compared to fibres expressing wild-type α1 subunits, R1239H mutant-expressing fibres displayed Ca2+ currents of reduced amplitude and a higher resting leak inward current that was increased by external acidification. External acidification also produced intracellular acidification at a higher rate in R1239H fibres and inhibited inward rectifier K+ currents. These data indicate that the R1239H mutation induces an elevated leak H+ current at rest flowing through a gating pore created by the mutation and that external acidification favours onset of muscle paralysis by potentiating H+ depolarizing currents and inhibiting resting inward rectifier K+ currents. Our results could thus explain why paralytic attacks preferentially occur during the recovery period following intense muscle exercise.
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Affiliation(s)
- Clarisse Fuster
- Institut NeuroMyoGene, Université Lyon 1, Université de Lyon, UMR CNRS 5310, Inserm U1217, 43 bd du 11 Novembre 1918, 69622, Villeurbanne, France
| | - Jimmy Perrot
- Institut NeuroMyoGene, Université Lyon 1, Université de Lyon, UMR CNRS 5310, Inserm U1217, 43 bd du 11 Novembre 1918, 69622, Villeurbanne, France
| | - Christine Berthier
- Institut NeuroMyoGene, Université Lyon 1, Université de Lyon, UMR CNRS 5310, Inserm U1217, 43 bd du 11 Novembre 1918, 69622, Villeurbanne, France
| | - Vincent Jacquemond
- Institut NeuroMyoGene, Université Lyon 1, Université de Lyon, UMR CNRS 5310, Inserm U1217, 43 bd du 11 Novembre 1918, 69622, Villeurbanne, France
| | - Bruno Allard
- Institut NeuroMyoGene, Université Lyon 1, Université de Lyon, UMR CNRS 5310, Inserm U1217, 43 bd du 11 Novembre 1918, 69622, Villeurbanne, France
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Barbé C, Bray F, Gueugneau M, Devassine S, Lause P, Tokarski C, Rolando C, Thissen JP. Comparative Proteomic and Transcriptomic Analysis of Follistatin-Induced Skeletal Muscle Hypertrophy. J Proteome Res 2017; 16:3477-3490. [PMID: 28810121 DOI: 10.1021/acs.jproteome.7b00069] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Skeletal muscle, the most abundant body tissue, plays vital roles in locomotion and metabolism. Myostatin is a negative regulator of skeletal muscle mass. In addition to increasing muscle mass, Myostatin inhibition impacts muscle contractility and energy metabolism. To decipher the mechanisms of action of the Myostatin inhibitors, we used proteomic and transcriptomic approaches to investigate the changes induced in skeletal muscles of transgenic mice overexpressing Follistatin, a physiological Myostatin inhibitor. Our proteomic workflow included a fractionation step to identify weakly expressed proteins and a comparison of fast versus slow muscles. Functional annotation of altered proteins supports the phenotypic changes induced by Myostatin inhibition, including modifications in energy metabolism, fiber type, insulin and calcium signaling, as well as membrane repair and regeneration. Less than 10% of the differentially expressed proteins were found to be also regulated at the mRNA level but the Biological Process annotation, and the KEGG pathways analysis of transcriptomic results shows a great concordance with the proteomic data. Thus this study describes the most extensive omics analysis of muscle overexpressing Follistatin, providing molecular-level insights to explain the observed muscle phenotypic changes.
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Affiliation(s)
- Caroline Barbé
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université Catholique de Louvain , 1200 Brussels, Belgium
| | - Fabrice Bray
- Miniaturisation pour la Synthèse, l'Analyse & la Protéomique (MSAP), CNRS, USR 3290, Université de Lille; Biochimie Structurale & Fonctionnelle des Assemblages Biomoléculaires, CNRS, FR 3688, FRABIO, Université de Lille and Institut Eugène-Michel Chevreul, CNRS, FR 2638, Université de Lille, 59000 Lille, France
| | - Marine Gueugneau
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université Catholique de Louvain , 1200 Brussels, Belgium
| | - Stéphanie Devassine
- Miniaturisation pour la Synthèse, l'Analyse & la Protéomique (MSAP), CNRS, USR 3290, Université de Lille; Biochimie Structurale & Fonctionnelle des Assemblages Biomoléculaires, CNRS, FR 3688, FRABIO, Université de Lille and Institut Eugène-Michel Chevreul, CNRS, FR 2638, Université de Lille, 59000 Lille, France
| | - Pascale Lause
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université Catholique de Louvain , 1200 Brussels, Belgium
| | - Caroline Tokarski
- Miniaturisation pour la Synthèse, l'Analyse & la Protéomique (MSAP), CNRS, USR 3290, Université de Lille; Biochimie Structurale & Fonctionnelle des Assemblages Biomoléculaires, CNRS, FR 3688, FRABIO, Université de Lille and Institut Eugène-Michel Chevreul, CNRS, FR 2638, Université de Lille, 59000 Lille, France
| | - Christian Rolando
- Miniaturisation pour la Synthèse, l'Analyse & la Protéomique (MSAP), CNRS, USR 3290, Université de Lille; Biochimie Structurale & Fonctionnelle des Assemblages Biomoléculaires, CNRS, FR 3688, FRABIO, Université de Lille and Institut Eugène-Michel Chevreul, CNRS, FR 2638, Université de Lille, 59000 Lille, France
| | - Jean-Paul Thissen
- Pole of Endocrinology, Diabetes and Nutrition, Institute of Experimental and Clinical Research, Université Catholique de Louvain , 1200 Brussels, Belgium
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Abstract
Over the past decade, interest in caveolae biology has peaked. These small bulb-shaped plasma membrane invaginations of 50-80nm diameter present in most cell types have been upgraded from simple membrane structures to a more complex bona fide organelle. However, although caveolae are involved in several essential cellular functions and pathologies, the underlying molecular mechanisms remain poorly defined. Following the identification of caveolins and cavins as the main caveolae constituents, recent studies have brought new insight into their structural organization as a coat. In this review, we discuss how these new data on caveolae can be integrated in the context of their role in signaling and pathophysiology.
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7
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Deng YF, Huang YY, Lu WS, Huang YH, Xian J, Wei HQ, Huang Q. The Caveolin-3 P104L mutation of LGMD-1C leads to disordered glucose metabolism in muscle cells. Biochem Biophys Res Commun 2017; 486:218-223. [PMID: 28232187 DOI: 10.1016/j.bbrc.2017.02.072] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 02/13/2017] [Indexed: 11/30/2022]
Abstract
Caveolin-3 (CAV3) is a muscle specific protein that plays an important role in maintaining muscle health and glucose homeostasis in vivo. A novel autosomal dominant form of LGMD-1C in humans is due to a P104L mutation within the coding sequence of the human CAV3 gene. The mechanism by which the LGMD-1C mutation leads to muscle weakness remains unknown. Our objective was to determine whether muscle weakness was related to the imbalance of glucose metabolism. We found that when the P104L mutation was transiently transfected into C2C12 cells, there was decreased glucose uptake and glycogen synthesis after insulin stimulation. Immunoblotting analysis showed that the P104L mutation resulted in decreased expression of CAV3, CAV1 and pAkt. Confocal immunomicroscopy indicated that the P104L mutation reduced CAV3 and GLUT4 in the cell membrane, which accumulated mainly near the nucleus. This work is the first report of an association between muscle weakness due to LGMD-1C and energy metabolism. The P104L mutation led to a decrease in C2C12 muscle glucose uptake and glycogen synthesis and may be involved in the pathogenesis of LGMD-1C.
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Affiliation(s)
- Yu Feng Deng
- School of Nursing, Youjiang Medical University for Nationalities, Baise, Guangxi, China
| | - Yi Yuan Huang
- School of Nursing, Youjiang Medical University for Nationalities, Baise, Guangxi, China
| | - Wen Sheng Lu
- Department of Endocrinology, The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, China
| | - Yuan Heng Huang
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi, China
| | - Jing Xian
- Department of Endocrinology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Hong Qiao Wei
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi, China
| | - Qin Huang
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi, China.
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Gutierrez-Pajares JL, Iturrieta J, Dulam V, Wang Y, Pavlides S, Malacari G, Lisanti MP, Frank PG. Caveolin-3 Promotes a Vascular Smooth Muscle Contractile Phenotype. Front Cardiovasc Med 2015; 2:27. [PMID: 26664898 PMCID: PMC4671348 DOI: 10.3389/fcvm.2015.00027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 05/24/2015] [Indexed: 01/12/2023] Open
Abstract
Epidemiological studies have demonstrated the importance of cardiovascular diseases in Western countries. Among the cell types associated with a dysfunctional vasculature, smooth muscle (SM) cells are believed to play an essential role in the development of these illnesses. Vascular SM cells are key regulators of the vascular tone and also have an important function in the development of atherosclerosis and restenosis. While in the normal vasculature, contractile SM cells are predominant, in atherosclerotic vascular lesions, synthetic cells migrate toward the neointima, proliferate, and synthetize extracellular matrix proteins. In the present study, we have examined the role of caveolin-3 in the regulation of SM cell phenotype. Caveolin-3 is expressed in vivo in normal arterial SM cells, but its expression appears to be lost in cultured SM cells. Our data show that caveolin-3 expression in the A7r5 SM cell line is associated with increased expression of contractility markers such as SM α-actin, SM myosin heavy chain but decreased expression of the synthetic phenotype markers such as p-Elk and Klf4. Moreover, we also show that caveolin-3 expression can reduce proliferation upon treatment with LDL or PDGF. Finally, we show that caveolin-3-expressing SM cells are less sensitive to apoptosis than control cells upon treatment with oxidized LDL. Taken together, our data suggest that caveolin-3 can regulate the phenotypic switch between contractile and synthetic SM cells. A better understanding of the factors regulating caveolin-3 expression and function in this cell type will permit the development of a better comprehension of the factors regulating SM function in atherosclerosis and restenosis.
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Affiliation(s)
- Jorge L Gutierrez-Pajares
- Faculté de Médecine, INSERM UMR1069 "Nutrition, Croissance et Cancer", Université François Rabelais de Tours , Tours , France ; Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Jeannette Iturrieta
- Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Vipin Dulam
- Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Yu Wang
- Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Stephanos Pavlides
- The Manchester Centre for Cellular Metabolism (MCCM), Institute of Cancer Sciences, University of Manchester , Manchester , UK ; The Breakthrough Breast Cancer Research Unit, Institute of Cancer Sciences, University of Manchester , Manchester , UK
| | - Gabriella Malacari
- Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA
| | - Michael P Lisanti
- The Manchester Centre for Cellular Metabolism (MCCM), Institute of Cancer Sciences, University of Manchester , Manchester , UK ; The Breakthrough Breast Cancer Research Unit, Institute of Cancer Sciences, University of Manchester , Manchester , UK
| | - Philippe G Frank
- Faculté de Médecine, INSERM UMR1069 "Nutrition, Croissance et Cancer", Université François Rabelais de Tours , Tours , France ; Department of Stem Cell Biology and Regenerative Medicine, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University , Philadelphia, PA , USA ; Department of Biochemistry and Molecular Biology, Thomas Jefferson University , Philadelphia, PA , USA
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9
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Root KT, Plucinsky SM, Glover KJ. Recent progress in the topology, structure, and oligomerization of caveolin: a building block of caveolae. CURRENT TOPICS IN MEMBRANES 2015; 75:305-36. [PMID: 26015287 DOI: 10.1016/bs.ctm.2015.03.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Caveolae are cholesterol-rich plasma membrane invaginations that are found in a plethora of cell types. They play many roles including signal transduction, endocytosis, and mechanoprotection. The most critical protein in caveolae is the integral membrane protein, caveolin, which has been shown to be necessary for caveolae formation, and governs the major functions attributed to caveolae. Caveolin is postulated to act as a scaffold in the high molecular weight striated coat that surrounds the caveolar bulb, stabilizing it. Caveolin interacts, both directly and indirectly, with a large number of signaling molecules, and presides over the endocytosis of molecular cargo by caveolae. However, many of the key biophysical aspects of the caveolin protein, its structure, topology, and oligomeric behavior, are just beginning to come to light. Herein is an up-to-date summary and critique of the progress that has been made in understanding caveolin on a molecular and atomic level.
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Affiliation(s)
- Kyle T Root
- Department of Chemistry, Lehigh University, Bethlehem, PA, USA
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10
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Barrientos G, Llanos P, Hidalgo J, Bolaños P, Caputo C, Riquelme A, Sánchez G, Quest AFG, Hidalgo C. Cholesterol removal from adult skeletal muscle impairs excitation-contraction coupling and aging reduces caveolin-3 and alters the expression of other triadic proteins. Front Physiol 2015; 6:105. [PMID: 25914646 PMCID: PMC4392612 DOI: 10.3389/fphys.2015.00105] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Accepted: 03/16/2015] [Indexed: 12/30/2022] Open
Abstract
Cholesterol and caveolin are integral membrane components that modulate the function/location of many cellular proteins. Skeletal muscle fibers, which have unusually high cholesterol levels in transverse tubules, express the caveolin-3 isoform but its association with transverse tubules remains contentious. Cholesterol removal impairs excitation–contraction (E–C) coupling in amphibian and mammalian fetal skeletal muscle fibers. Here, we show that treating single muscle fibers from adult mice with the cholesterol removing agent methyl-β-cyclodextrin decreased fiber cholesterol by 26%, altered the location pattern of caveolin-3 and of the voltage dependent calcium channel Cav1.1, and suppressed or reduced electrically evoked Ca2+ transients without affecting membrane integrity or causing sarcoplasmic reticulum (SR) calcium depletion. We found that transverse tubules from adult muscle and triad fractions that contain ~10% attached transverse tubules, but not SR membranes, contained caveolin-3 and Cav1.1; both proteins partitioned into detergent-resistant membrane fractions highly enriched in cholesterol. Aging entails significant deterioration of skeletal muscle function. We found that triad fractions from aged rats had similar cholesterol and RyR1 protein levels compared to triads from young rats, but had lower caveolin-3 and glyceraldehyde 3-phosphate dehydrogenase and increased Na+/K+-ATPase protein levels. Both triad fractions had comparable NADPH oxidase (NOX) activity and protein content of NOX2 subunits (p47phox and gp91phox), implying that NOX activity does not increase during aging. These findings show that partial cholesterol removal impairs E–C coupling and alters caveolin-3 and Cav1.1 location pattern, and that aging reduces caveolin-3 protein content and modifies the expression of other triadic proteins. We discuss the possible implications of these findings for skeletal muscle function in young and aged animals.
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Affiliation(s)
- Genaro Barrientos
- Physiology and Biophysics Program, Institute of Biomedical Sciences, School of Medicine, University of Chile Santiago, Chile
| | - Paola Llanos
- Institute for Research in Dental Sciences, Faculty of Dentistry, University of Chile Santiago, Chile
| | - Jorge Hidalgo
- Physiology and Biophysics Program, Institute of Biomedical Sciences, School of Medicine, University of Chile Santiago, Chile
| | - Pura Bolaños
- Centre of Biophysics and Biochemistry, Venezuelan Institute for Scientific Research Caracas, Venezuela
| | - Carlo Caputo
- Centre of Biophysics and Biochemistry, Venezuelan Institute for Scientific Research Caracas, Venezuela
| | - Alexander Riquelme
- Biomedical Neuroscience Institute, School of Medicine, University of Chile Santiago, Chile
| | - Gina Sánchez
- Biomedical Neuroscience Institute, School of Medicine, University of Chile Santiago, Chile ; Pathophysiology Program, Institute of Biomedical Sciences, School of Medicine, University of Chile Santiago, Chile ; Center for Molecular Studies of the Cell, School of Medicine, University of Chile Santiago, Chile
| | - Andrew F G Quest
- Center for Molecular Studies of the Cell, School of Medicine, University of Chile Santiago, Chile ; Laboratory of Cell Communication, Program in Cell and Molecular Biology, Institute of Biomedical Sciences, School of Medicine, University of Chile Santiago, Chile ; Advanced Center for Chronic Diseases and Network for Metabolic Stress Signaling, University of Chile Santiago, Chile
| | - Cecilia Hidalgo
- Physiology and Biophysics Program, Institute of Biomedical Sciences, School of Medicine, University of Chile Santiago, Chile ; Biomedical Neuroscience Institute, School of Medicine, University of Chile Santiago, Chile ; Center for Molecular Studies of the Cell, School of Medicine, University of Chile Santiago, Chile
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11
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A family with discordance between malignant hyperthermia susceptibility and rippling muscle disease. J Anesth 2012; 27:128-31. [DOI: 10.1007/s00540-012-1482-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Accepted: 08/27/2012] [Indexed: 10/27/2022]
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12
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The transmembrane domain of caveolin-1 exhibits a helix-break-helix structure. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1818:1158-64. [PMID: 22240009 DOI: 10.1016/j.bbamem.2011.12.033] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2011] [Revised: 12/28/2011] [Accepted: 12/29/2011] [Indexed: 11/21/2022]
Abstract
Caveolin is an integral membrane protein that is found in high abundance in caveolae. Both the N- and C- termini lie on the same side of the membrane, and the transmembrane domain has been postulated to form an unusual intra-membrane horseshoe configuration. To probe the structure of the transmembrane domain, we have prepared a construct of caveolin-1 that encompasses residues 96-136 (the entire intact transmembrane domain). Caveolin-1(96-136) was over-expressed and isotopically labeled in E. coli, purified to homogeneity, and incorporated into lyso-myristoylphosphatidylglycerol micelles. Circular dichroism and NMR spectroscopy reveal that the transmembrane domain of caveolin-1 is primarily α-helical (57-65%). Furthermore, chemical shift indexing reveals that the transmembrane domain has a helix-break-helix structure which could be critical for the formation of the intra-membrane horseshoe conformation predicted for caveolin-1. The break in the helix spans residues 108 to 110, and alanine scanning mutagenesis was carried out to probe the structural significance of these residues. Our results indicate that mutation of glycine 108 to alanine does not disrupt the structure, but mutation of isoleucine 109 and proline 110 to alanine dramatically alters the helix-break-helix structure. To explore the structural determinants further, additional mutagenesis was performed. Glycine 108 can be substituted with other small side chain amino acids (i.e. alanine), leucine 109 can be substituted with other β-branched amino acids (i.e. valine), and proline 110 cannot be substituted without disrupting the helix-break-helix structure.
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13
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Ullrich ND, Fischer D, Kornblum C, Walter MC, Niggli E, Zorzato F, Treves S. Alterations of excitation-contraction coupling and excitation coupled Ca(2+) entry in human myotubes carrying CAV3 mutations linked to rippling muscle. Hum Mutat 2011; 32:309-17. [PMID: 21294223 PMCID: PMC3132216 DOI: 10.1002/humu.21431] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Accepted: 12/06/2010] [Indexed: 11/08/2022]
Abstract
Rippling muscle disease is caused by mutations in the gene encoding caveolin-3 (CAV3), the muscle-specific isoform of the scaffolding protein caveolin, a protein involved in the formation of caveolae. In healthy muscle, caveolin-3 is responsible for the formation of caveolae, which are highly organized sarcolemmal clusters influencing early muscle differentiation, signalling and Ca2+ homeostasis. In the present study we examined Ca2+ homeostasis and excitation–contraction (E-C) coupling in cultured myotubes derived from two patients with Rippling muscle disease with severe reduction in caveolin-3 expression; one patient harboured the heterozygous c.84C>A mutation while the other patient harbored a homozygous splice-site mutation (c.102+ 2T>C) affecting the splice donor site of intron 1 of the CAV3 gene. Our results show that cells from control and rippling muscle disease patients had similar resting [Ca2+]i and 4-chloro-m-cresol-induced Ca2+ release but reduced KCl-induced Ca2+ influx. Detailed analysis of the voltage-dependence of Ca2+ transients revealed a significant shift of Ca2+ release activation to higher depolarization levels in CAV3 mutated cells. High resolution immunofluorescence analysis by Total Internal Fluorescence microscopy supports the hypothesis that loss of caveolin-3 leads to microscopic disarrays in the colocalization of the voltage-sensing dihydropyridine receptor and the ryanodine receptor, thereby reducing the efficiency of excitation–contraction coupling. Hum Mutat 32:309–317, 2011. © 2011 Wiley-Liss, Inc.
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Affiliation(s)
- Nina D Ullrich
- Department of Physiology, University of Bern, Switzerland
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14
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Couchoux H, Bichraoui H, Chouabe C, Altafaj X, Bonvallet R, Allard B, Ronjat M, Berthier C. Caveolin-3 is a direct molecular partner of the Cav1.1 subunit of the skeletal muscle L-type calcium channel. Int J Biochem Cell Biol 2011; 43:713-20. [PMID: 21262376 DOI: 10.1016/j.biocel.2011.01.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2010] [Revised: 12/18/2010] [Accepted: 01/17/2011] [Indexed: 12/14/2022]
Abstract
Caveolin-3 is the striated muscle specific isoform of the scaffolding protein family of caveolins and has been shown to interact with a variety of proteins, including ion channels. Mutations in the human CAV3 gene have been associated with several muscle disorders called caveolinopathies and among these, the P104L mutation (Cav-3(P104L)) leads to limb girdle muscular dystrophy of type 1C characterized by the loss of sarcolemmal caveolin. There is still no clear-cut explanation as to specifically how caveolin-3 mutations lead to skeletal muscle wasting. Previous results argued in favor of a role for caveolin-3 in dihydropyridine receptor (DHPR) functional regulation and/or T-tubular membrane localization. It appeared worth closely examining such a functional link and investigating if it could result from the direct physical interaction of the two proteins. Transient expression of Cav-3(P104L) or caveolin-3 specific siRNAs in C2C12 myotubes both led to a significant decrease of the L-type Ca(2+) channel maximal conductance. Immunolabeling analysis of adult skeletal muscle fibers revealed the colocalization of a pool of caveolin-3 with the DHPR within the T-tubular membrane. Caveolin-3 was also shown to be present in DHPR-containing triadic membrane preparations from which both proteins co-immunoprecipitated. Using GST-fusion proteins, the I-II loop of Ca(v)1.1 was identified as the domain interacting with caveolin-3, with an apparent affinity of 60nM. The present study thus revealed a direct molecular interaction between caveolin-3 and the DHPR which is likely to underlie their functional link and whose loss might therefore be involved in pathophysiological mechanisms associated to muscle caveolinopathies.
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Affiliation(s)
- Harold Couchoux
- Physiologie Intégrative Cellulaire et Moléculaire, Université Lyon 1, UMR CNRS 5123, Université de Lyon, 43 Boulevard du 11 novembre 1918, F-69622 Villeurbanne, France
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15
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Weiss N, Legrand C, Pouvreau S, Bichraoui H, Allard B, Zamponi GW, De Waard M, Jacquemond V. In vivo expression of G-protein beta1gamma2 dimer in adult mouse skeletal muscle alters L-type calcium current and excitation-contraction coupling. J Physiol 2010; 588:2945-60. [PMID: 20547679 DOI: 10.1113/jphysiol.2010.191593] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A number of G-protein-coupled receptors are expressed in skeletal muscle but their roles in muscle physiology and downstream effector systems remain poorly investigated. Here we explored the functional importance of the G-protein betagamma (Gbetagamma) signalling pathway on voltage-controlled Ca(2+) homeostasis in single isolated adult skeletal muscle fibres. A GFP-tagged Gbeta(1)gamma(2) dimer was expressed in vivo in mice muscle fibres. The GFP fluorescence pattern was consistent with a Gbeta(1)gamma(2) dimer localization in the transverse-tubule membrane. Membrane current and indo-1 fluorescence measurements performed under voltage-clamp conditions reveal a drastic reduction of both L-type Ca(2+) current density and of peak amplitude of the voltage-activated Ca(2+) transient in Gbeta(1)gamma(2)-expressing fibres. These effects were not observed upon expression of Gbeta(2)gamma(2), Gbeta(3)gamma(2) or Gbeta(4)gamma(2). Our data suggest that the G-protein beta(1)gamma(2) dimer may play an important regulatory role in skeletal muscle excitation-contraction coupling.
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Affiliation(s)
- Norbert Weiss
- Université Lyon 1, UMR CNRS 5123, Physiologie Intégrative Cellulaire et Moléculaire, Bâtiment R. Dubois, 43 boulevard du 11 novembre 1918, Villeurbanne, France.
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16
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Current world literature. Curr Opin Neurol 2009; 22:554-61. [PMID: 19755870 DOI: 10.1097/wco.0b013e3283313b14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Berbey C, Allard B. Electrically silent divalent cation entries in resting and active voltage-controlled muscle fibers. Biophys J 2009; 96:2648-57. [PMID: 19348748 DOI: 10.1016/j.bpj.2009.01.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2008] [Revised: 01/05/2009] [Accepted: 01/06/2009] [Indexed: 02/06/2023] Open
Abstract
Ca2+ is known to enter skeletal muscle at rest and during activity. Except for the well-characterized Ca2+ entry through L-type channels, pathways involved in these Ca2+ entries remain elusive in adult muscle. This study investigates Ca2+ influx at rest and during activity using the method of Mn2+ quenching of fura-2 fluorescence on voltage-controlled adult skeletal muscle cells. Resting rate of Mn2+ influx depended on external [Mn2+] and membrane potential. At -80 mV, replacement of Mg2+ by Mn2+ gave rise to an outward current associated with an increase in cell input resistance. Calibration of fura-2 response indicated that Mn2+ influx was too small to be resolved as a macroscopic current. Partial depletion of the sarcoplasmic reticulum induced by a train of action potentials in the presence of cyclopiazonic acid led to a slight increase in resting Mn2+ influx but no change in cell input resistance and membrane potential. Trains of action potentials considerably increased Mn2+ entry through an electrically silent pathway independent of L-type channels, which provided 24% of the global Mn2+ influx at +30 mV under voltage-clamp conditions. Within this context, the nature and the physiological role of the Ca2+ pathways involved during muscle excitation still remain open questions.
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Affiliation(s)
- Céline Berbey
- Physiologie Intégrative Cellulaire et Moléculaire, Université Lyon 1, Centre National de la Recherche Scientifique Unité Mixte de Recherche, 5123 Villeurbanne, France
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