1
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Zádor E. The Meeting of Micropeptides with Major Ca 2+ Pumps in Inner Membranes-Consideration of a New Player, SERCA1b. MEMBRANES 2023; 13:274. [PMID: 36984661 PMCID: PMC10058886 DOI: 10.3390/membranes13030274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/20/2023] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
Calcium is a major signalling bivalent cation within the cell. Compartmentalization is essential for regulation of calcium mediated processes. A number of players contribute to intracellular handling of calcium, among them are the sarco/endoplasmic reticulum calcium ATP-ases (SERCAs). These molecules function in the membrane of ER/SR pumping Ca2+ from cytoplasm into the lumen of the internal store. Removal of calcium from the cytoplasm is essential for signalling and for relaxation of skeletal muscle and heart. There are three genes and over a dozen isoforms of SERCA in mammals. These can be potentially influenced by small membrane peptides, also called regulins. The discovery of micropeptides has increased in recent years, mostly because of the small ORFs found in long RNAs, annotated formerly as noncoding (lncRNAs). Several excellent works have analysed the mechanism of interaction of micropeptides with each other and with the best known SERCA1a (fast muscle) and SERCA2a (heart, slow muscle) isoforms. However, the array of tissue and developmental expressions of these potential regulators raises the question of interaction with other SERCAs. For example, the most abundant calcium pump in neonatal and regenerating skeletal muscle, SERCA1b has never been looked at with scrutiny to determine whether it is influenced by micropeptides. Further details might be interesting on the interaction of these peptides with the less studied SERCA1b isoform.
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Affiliation(s)
- Ernő Zádor
- Institute of Biochemistry, Albert Szent-Györgyi Faculty of Medicine, University of Szeged, Dóm tér 9, H-6720 Szeged, Hungary
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2
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Disturbance of calcium homeostasis and myogenesis caused by TET2 deletion in muscle stem cells. Cell Death Dis 2022; 8:236. [PMID: 35490157 PMCID: PMC9056526 DOI: 10.1038/s41420-022-01041-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 04/16/2022] [Accepted: 04/21/2022] [Indexed: 01/22/2023]
Abstract
Skeletal muscle myogenesis is a sophisticated process controlled by genetic and epigenetic regulators. In animals, one of the key enzymes for the DNA demethylation of 5-methylcytosine is TET2. Although TET2 is essential for muscle development, the mechanisms by which TET2 regulates myogenesis, particularly the implication for muscle stem cells, remains unclear. In the present study, we employed the TET2 knockout mouse model to investigate the function of TET2 in muscle development and regeneration. We observed that TET2 deficiency caused impaired muscle stem cell proliferation and differentiation, resulting in the reduction in both myofiber number and muscle tissue size. Specifically, TET2 maintains calcium homeostasis in muscle stem cells by controlling the DNA methylation levels of the calcium pathway genes. Forced expression of the sodium/calcium exchanger protein SLC8A3 could rescue the myogenic defects in TET2 knockout cells. Our data not only illustrated the vital function of TET2 during myogenesis but also identified novel targets that contribute to calcium homeostasis for enhancing muscle function.
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3
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Talmon M, Massara E, Pruonto G, Quaregna M, Boccafoschi F, Riva B, Fresu LG. Characterization of a functional Ca2+ toolkit in urine-derived stem cells and derived skeletal muscle cells. Cell Calcium 2022; 103:102548. [DOI: 10.1016/j.ceca.2022.102548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 01/11/2022] [Accepted: 02/02/2022] [Indexed: 11/16/2022]
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4
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Chambers PJ, Juracic ES, Fajardo VA, Tupling AR. The role of SERCA and sarcolipin in adaptive muscle remodeling. Am J Physiol Cell Physiol 2022; 322:C382-C394. [PMID: 35044855 DOI: 10.1152/ajpcell.00198.2021] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Sarcolipin (SLN) is a small integral membrane protein that regulates the sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA) pump. When bound to SERCA, SLN reduces the apparent Ca2+ affinity of SERCA and uncouples SERCA Ca2+ transport from its ATP consumption. As such, SLN plays a direct role in altering skeletal muscle relaxation and energy expenditure. Interestingly, the expression of SLN is dynamic during times of muscle adaptation, where large increases in SLN content are found in response to development, atrophy, overload and disease. Several groups have suggested that increases in SLN, especially in dystrophic muscle, are deleterious to muscle function and exacerbate already abhorrent intracellular Ca2+ levels. However, there is also significant evidence to show that increased SLN content is a beneficial adaptive mechanism which protects the SERCA pump and activates Ca2+ signaling and adaptive remodeling during times of cell stress. In this review, we first discuss the role for SLN in healthy muscle during both development and overload, where SLN has been shown to activate Ca2+ signaling to promote mitochondrial biogenesis, fibre type shifts and muscle hypertrophy. Then, with respect to muscle disease, we summarize the discrepancies in the literature as to whether SLN upregulation is adaptive or maladaptive in nature. This review is the first to offer the concept of SLN hormesis in muscle disease, wherein both too much and too little SLN are detrimental to muscle health. Finally, the underlying mechanisms which activate SLN upregulation are discussed, specifically acknowledging a potential positive feedback loop between SLN and Ca2+ signaling molecules.
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Affiliation(s)
- Paige J Chambers
- Department of Kinesiology and Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
| | - Emma S Juracic
- Department of Kinesiology and Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
| | - Val A Fajardo
- Department Department of Kinesiology, Brock University, St. Catharines, Ontario, Canada.,Centre for Bone and Muscle Health, Brock University, St. Catharines, Ontario, Canada
| | - A Russell Tupling
- Department of Kinesiology and Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
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5
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Tan B, Wang S, Wang S, Zeng J, Hong L, Li Z, Yang J, Cai G, Zheng E, Wu Z, Gu T. Genome-Wide Analysis of H3K27me3 in Porcine Embryonic Muscle Development. Front Cell Dev Biol 2021; 9:739321. [PMID: 34805148 PMCID: PMC8602352 DOI: 10.3389/fcell.2021.739321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Accepted: 10/11/2021] [Indexed: 12/25/2022] Open
Abstract
The trimethylation of histone H3 lysine 27 (H3K27me3) is one of the most important chromatin modifications, which is generally presented as a repressive mark in various biological processes. However, the dynamic and global-scale distribution of H3K27me3 during porcine embryonic muscle development remains unclear. Here, our study provided a comprehensive genome-wide view of H3K27me3 and analyzed the matching transcriptome in the skeletal muscles on days 33, 65, and 90 post-coitus from Duroc fetuses. Transcriptome analysis identified 4,124 differentially expressed genes (DEGs) and revealed the key transcriptional properties in three stages. We found that the global H3K27me3 levels continually increased during embryonic development, and the H3K27me3 level was negatively correlated with gene expression. The loss of H3K27me3 in the promoter was associated with the transcriptional activation of 856 DEGs in various processes, including skeletal muscle development, calcium signaling, and multiple metabolic pathways. We also identified for the first time that H3K27me3 could enrich in the promoter of genes, such as DES, MYL1, TNNC1, and KLF5, to negatively regulate gene expression in porcine satellite cells (PSCs). The loss of H3K27me3 could promote muscle cell differentiation. Taken together, this study provided the first genome-wide landscape of H3K27me3 in porcine embryonic muscle development. It revealed the complex and broad function of H3K27me3 in the regulation of embryonic muscle development from skeletal muscle morphogenesis to myofiber maturation.
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Affiliation(s)
- Baohua Tan
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Sheng Wang
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Huazhong Agricultural University, Ministry of Education, Wuhan, China
| | - Shanshan Wang
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Jiekang Zeng
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Linjun Hong
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Zicong Li
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Jie Yang
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Gengyuan Cai
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Enqin Zheng
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Zhenfang Wu
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Ting Gu
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
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6
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Zhang H, Bryson VG, Wang C, Li T, Kerr JP, Wilson R, Muoio DM, Bloch RJ, Ward C, Rosenberg PB. Desmin interacts with STIM1 and coordinates Ca2+ signaling in skeletal muscle. JCI Insight 2021; 6:143472. [PMID: 34494555 PMCID: PMC8492340 DOI: 10.1172/jci.insight.143472] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 07/28/2021] [Indexed: 12/30/2022] Open
Abstract
Stromal interaction molecule 1 (STIM1), the sarcoplasmic reticulum (SR) transmembrane protein, activates store-operated Ca2+ entry (SOCE) in skeletal muscle and, thereby, coordinates Ca2+ homeostasis, Ca2+-dependent gene expression, and contractility. STIM1 occupies space in the junctional SR membrane of the triads and the longitudinal SR at the Z-line. How STIM1 is organized and is retained in these specific subdomains of the SR is unclear. Here, we identified desmin, the major type III intermediate filament protein in muscle, as a binding partner for STIM1 based on a yeast 2-hybrid screen. Validation of the desmin-STIM1 interaction by immunoprecipitation and immunolocalization confirmed that the CC1-SOAR domains of STIM1 interact with desmin to enhance STIM1 oligomerization yet limit SOCE. Based on our studies of desmin-KO mice, we developed a model wherein desmin connected STIM1 at the Z-line in order to regulate the efficiency of Ca2+ refilling of the SR. Taken together, these studies showed that desmin-STIM1 assembles a cytoskeletal-SR connection that is important for Ca2+ signaling in skeletal muscle.
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Affiliation(s)
- Hengtao Zhang
- Department of Medicine and
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - Victoria Graham Bryson
- Department of Medicine and
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - Chaojian Wang
- Department of Medicine and
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - TianYu Li
- Department of Medicine and
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - Jaclyn P. Kerr
- Department of Physiology and
- Department of Orthopedic Surgery, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Rebecca Wilson
- Department of Medicine and
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - Deborah M. Muoio
- Department of Medicine and
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - Robert J. Bloch
- Department of Physiology and
- Department of Orthopedic Surgery, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Christopher Ward
- Department of Physiology and
- Department of Orthopedic Surgery, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Paul B. Rosenberg
- Department of Medicine and
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina, USA
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7
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Rosenberg P, Zhang H, Bryson VG, Wang C. SOCE in the cardiomyocyte: the secret is in the chambers. Pflugers Arch 2021; 473:417-434. [PMID: 33638008 PMCID: PMC7910201 DOI: 10.1007/s00424-021-02540-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 01/28/2021] [Accepted: 02/05/2021] [Indexed: 11/24/2022]
Abstract
Store-operated Ca2+ entry (SOCE) is an ancient and ubiquitous Ca2+ signaling pathway that is present in virtually every cell type. Over the last two decades, many studies have implicated this non-voltage dependent Ca2+ entry pathway in cardiac physiology. The relevance of the SOCE pathway in cardiomyocytes is often questioned given the well-established role for excitation contraction coupling. In this review, we consider the evidence that STIM1 and SOCE contribute to Ca2+ dynamics in cardiomyocytes. We discuss the relevance of this pathway to cardiac growth in response to developmental and pathologic cues. We also address whether STIM1 contributes to Ca2+ store refilling that likely impacts cardiac pacemaking and arrhythmogenesis in cardiomyocytes.
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Affiliation(s)
- Paul Rosenberg
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27705, USA.
| | - Hengtao Zhang
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27705, USA
| | | | - Chaojian Wang
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27705, USA
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8
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Niranjan N, Mareedu S, Tian Y, Kodippili K, Fefelova N, Voit A, Xie LH, Duan D, Babu GJ. Sarcolipin overexpression impairs myogenic differentiation in Duchenne muscular dystrophy. Am J Physiol Cell Physiol 2019; 317:C813-C824. [PMID: 31365291 DOI: 10.1152/ajpcell.00146.2019] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Reduction in the expression of sarcolipin (SLN), an inhibitor of sarco(endo)plasmic reticulum (SR) Ca2+-ATPase (SERCA), ameliorates severe muscular dystrophy in mice. However, the mechanism by which SLN inhibition improves muscle structure remains unclear. Here, we describe the previously unknown function of SLN in muscle differentiation in Duchenne muscular dystrophy (DMD). Overexpression of SLN in C2C12 resulted in decreased SERCA pump activity, reduced SR Ca2+ load, and increased intracellular Ca2+ (Cai2+) concentration. In addition, SLN overexpression resulted in altered expression of myogenic markers and poor myogenic differentiation. In dystrophin-deficient dog myoblasts and myotubes, SLN expression was significantly high and associated with defective Cai2+ cycling. The dystrophic dog myotubes were less branched and associated with decreased autophagy and increased expression of mitochondrial fusion and fission proteins. Reduction in SLN expression restored these changes and enhanced dystrophic dog myoblast fusion during differentiation. In summary, our data suggest that SLN upregulation is an intrinsic secondary change in dystrophin-deficient myoblasts and could account for the Cai2+ mishandling, which subsequently contributes to poor myogenic differentiation. Accordingly, reducing SLN expression can improve the Cai2+ cycling and differentiation of dystrophic myoblasts. These findings provide cellular-level supports for targeting SLN expression as a therapeutic strategy for DMD.
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Affiliation(s)
- Nandita Niranjan
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers University, Newark, New Jersey
| | - Satvik Mareedu
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers University, Newark, New Jersey
| | - Yimin Tian
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers University, Newark, New Jersey
| | - Kasun Kodippili
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, Missouri
| | - Nadezhda Fefelova
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers University, Newark, New Jersey
| | - Antanina Voit
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers University, Newark, New Jersey
| | - Lai-Hua Xie
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers University, Newark, New Jersey
| | - Dongsheng Duan
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, Missouri.,Department of Neurology, University of Missouri, Columbia, Missouri.,Department of Biomedical, Biological & Chemical Engineering, University of Missouri, Columbia, Missouri.,Department of Biomedical Sciences, University of Missouri, Columbia, Missouri
| | - Gopal J Babu
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers University, Newark, New Jersey
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9
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Rosenberg P, Katz D, Bryson V. SOCE and STIM1 signaling in the heart: Timing and location matter. Cell Calcium 2018; 77:20-28. [PMID: 30508734 DOI: 10.1016/j.ceca.2018.11.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 11/26/2018] [Accepted: 11/26/2018] [Indexed: 01/11/2023]
Abstract
Store operated Ca2+ entry (SOCE) is an ancient and ubiquitous Ca2+ signaling pathway discovered decades ago, but the function of SOCE in human physiology is only now being revealed. The relevance of this pathway to striated muscle was solidified with the description of skeletal myopathies that result from mutations in STIM1 and Orai1, the two SOCE components. Here, we consider the evidence for STIM1 and SOCE in cardiac muscle and the sinoatrial node. We highlight recent studies revealing a role for STIM1 in cardiac growth in response to developmental and pathologic cues. We also review the role of STIM1 in the regulation of SOCE and Ca2+ store refilling in a non-Orai dependent manner. Finally, we discuss the importance of this pathway in ventricular cardiomyocytes where SOCE contribute to developmental growth and in pacemaker cells where SOCE likely has a fundamental to generating the cardiac rhythm.
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Affiliation(s)
- Paul Rosenberg
- Department of Medicine, Duke University School of Medicine, Durham, NC, United States.
| | - Danielle Katz
- Department of Medicine, Duke University School of Medicine, Durham, NC, United States
| | - Victoria Bryson
- Department of Medicine, Duke University School of Medicine, Durham, NC, United States
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10
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Gamage TH, Gunnes G, Lee RH, Louch WE, Holmgren A, Bruton JD, Lengle E, Kolstad TRS, Revold T, Amundsen SS, Dalen KT, Holme PA, Tjønnfjord GE, Christensen G, Westerblad H, Klungland A, Bergmeier W, Misceo D, Frengen E. STIM1 R304W causes muscle degeneration and impaired platelet activation in mice. Cell Calcium 2018; 76:87-100. [PMID: 30390422 DOI: 10.1016/j.ceca.2018.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/03/2018] [Accepted: 10/03/2018] [Indexed: 12/21/2022]
Abstract
STIM1 and ORAI1 regulate store-operated Ca2+ entry (SOCE) in most cell types, and mutations in these proteins have deleterious and diverse effects. We established a mouse line expressing the STIM1 R304 W gain-of-function mutation causing Stormorken syndrome to explore effects on organ and cell physiology. While STIM1 R304 W was lethal in the homozygous state, surviving mice presented with reduced growth, skeletal muscle degeneration, and reduced exercise endurance. Variable STIM1 expression levels between tissues directly impacted cellular SOCE capacity. In contrast to patients with Stormorken syndrome, STIM1 was downregulated in fibroblasts from Stim1R304W/R304W mice, which maintained SOCE despite constitutive protein activity. In studies using foetal liver chimeras, STIM1 protein was undetectable in homozygous megakaryocytes and platelets, resulting in impaired platelet activation and absent SOCE. These data indicate that downregulation of STIM1 R304 W effectively opposes the gain-of-function phenotype associated with this mutation, and highlight the importance of STIM1 in skeletal muscle development and integrity.
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Affiliation(s)
- Thilini H Gamage
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Gjermund Gunnes
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Norway
| | - Robert Hugh Lee
- Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, USA
| | - William Edward Louch
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo Norway
| | - Asbjørn Holmgren
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Joseph D Bruton
- Department of Physiology and Pharmacology, Karolinska Institute, 171 77 Stockholm, Sweden
| | - Emma Lengle
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Terje R Selnes Kolstad
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo Norway
| | - Tobias Revold
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Norway
| | | | | | - Pål Andre Holme
- Department of Haematology, Oslo University Hospital, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Geir Erland Tjønnfjord
- Department of Haematology, Oslo University Hospital, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Geir Christensen
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo Norway
| | - Håkan Westerblad
- Department of Physiology and Pharmacology, Karolinska Institute, 171 77 Stockholm, Sweden
| | - Arne Klungland
- Department of Molecular Medicine, Oslo University Hospital, Norway
| | - Wolfgang Bergmeier
- Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, USA
| | - Doriana Misceo
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Eirik Frengen
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway.
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11
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Yang S, Wang D, Cao X, Zhang X, Yuan X, Yang T, Mi Y. Store operated calcium channels are associated with diabetic cystopathy in streptozotocin‑induced diabetic rats. Mol Med Rep 2018. [PMID: 29532875 PMCID: PMC5928646 DOI: 10.3892/mmr.2018.8723] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Store operated calcium channels (SOCCs) have been suggested to play a critical role in many diabetic complications. Diabetic cystopathy (DCP) is common in patients with diabetes, but the role of SOCCs in DCP is still unclear. The aim of the present study was to investigate the role of SOCCs in DCP with streptozocin (STZ)-induced diabetic rats. Specifically, the authors investigated whether SOCCs were altered in streptozocin (STZ)-induced diabetic rats and, if so, how this may contribute to the contraction of bladder detrusor strips and the intracellular Ca2+ concentration of bladder smooth muscle cells in diabetic rats. Cyclopiazonic acid (CPA, 10 µM) and SKF-96365 (10 µM) were used to activate and inhibit SOCCs respectively, to research the effects of SOCCs on the contraction of the bladder detrusor strips in normal and STZ-induced diabetic rats at the 4th, 8th and 12th week after the diabetic rat model was established. The changes of intracellular Ca2+ were also evaluated under confocal microscopy with pretreated Fluo-4AM. In addition, the expressions of Orai1 and STIM1 were detected by reverse transcription-quantitative polymerase chain reaction and western blotting at different time points. According to the results, the contractive frequency of diabetic bladder muscle strips was higher than that of controls in the 4th and 8th week. The increased fluorescence intensity was detected after using CPA and SKF-96365 in diabetic groups. The expressions of Orai1 and STIM1 changed in a time-dependent manner.
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Affiliation(s)
- Sen Yang
- First College of Clinical Medicine, First Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, P.R. China
| | - Dongwen Wang
- First College of Clinical Medicine, First Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, P.R. China
| | - Xiaoming Cao
- First College of Clinical Medicine, First Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, P.R. China
| | - Xuhui Zhang
- First College of Clinical Medicine, First Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, P.R. China
| | - Xiaobin Yuan
- First College of Clinical Medicine, First Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, P.R. China
| | - Tiancheng Yang
- First College of Clinical Medicine, First Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, P.R. China
| | - Yang Mi
- First College of Clinical Medicine, First Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, P.R. China
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12
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Voit A, Patel V, Pachon R, Shah V, Bakhutma M, Kohlbrenner E, McArdle JJ, Dell'Italia LJ, Mendell JR, Xie LH, Hajjar RJ, Duan D, Fraidenraich D, Babu GJ. Reducing sarcolipin expression mitigates Duchenne muscular dystrophy and associated cardiomyopathy in mice. Nat Commun 2017; 8:1068. [PMID: 29051551 PMCID: PMC5648780 DOI: 10.1038/s41467-017-01146-7] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 08/22/2017] [Indexed: 01/16/2023] Open
Abstract
Sarcolipin (SLN) is an inhibitor of the sarco/endoplasmic reticulum (SR) Ca2+ ATPase (SERCA) and is abnormally elevated in the muscle of Duchenne muscular dystrophy (DMD) patients and animal models. Here we show that reducing SLN levels ameliorates dystrophic pathology in the severe dystrophin/utrophin double mutant (mdx:utr -/-) mouse model of DMD. Germline inactivation of one allele of the SLN gene normalizes SLN expression, restores SERCA function, mitigates skeletal muscle and cardiac pathology, improves muscle regeneration, and extends the lifespan. To translate our findings into a therapeutic strategy, we knock down SLN expression in 1-month old mdx:utr -/- mice via adeno-associated virus (AAV) 9-mediated RNA interference. The AAV treatment markedly reduces SLN expression, attenuates muscle pathology and improves diaphragm, skeletal muscle and cardiac function. Taken together, our findings suggest that SLN reduction is a promising therapeutic approach for DMD.
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Affiliation(s)
- Antanina Voit
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Vishwendra Patel
- Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Ronald Pachon
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Vikas Shah
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Mohammad Bakhutma
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Erik Kohlbrenner
- Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Joseph J McArdle
- Department of Pharmacology, Physiology and Neuroscience, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Louis J Dell'Italia
- Department of Medicine, University of Alabama at Birmingham, and Birmingham VA Medical Center, Birmingham, AL, 35294, USA
| | - Jerry R Mendell
- Department of Pediatrics and Department of Neurology, Ohio State University Research Institute at Nationwide Children's Hospital, Columbus, OH, 43205, USA
| | - Lai-Hua Xie
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Roger J Hajjar
- Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Dongsheng Duan
- Department of Molecular Microbiology and Immunology, Neurology, Bioengineering, Biomedical Sciences, The University of Missouri, Columbia, MO, 65212, USA
| | - Diego Fraidenraich
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Gopal J Babu
- Department of Cell Biology and Molecular Medicine, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA.
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Tu MK, Levin JB, Hamilton AM, Borodinsky LN. Calcium signaling in skeletal muscle development, maintenance and regeneration. Cell Calcium 2016; 59:91-7. [PMID: 26944205 DOI: 10.1016/j.ceca.2016.02.005] [Citation(s) in RCA: 116] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 02/06/2016] [Accepted: 02/10/2016] [Indexed: 12/28/2022]
Abstract
Skeletal muscle-specific stem cells are pivotal for tissue development and regeneration. Muscle plasticity, inherent in these processes, is also essential for daily life activities. Great advances and efforts have been made in understanding the function of the skeletal muscle-dedicated stem cells, called muscle satellite cells, and the specific signaling mechanisms that activate them for recruitment in the repair of the injured muscle. Elucidating these signaling mechanisms may contribute to devising therapies for muscular injury or disease. Here we review the studies that have contributed to our understanding of how calcium signaling regulates skeletal muscle development, homeostasis and regeneration, with a focus on the calcium dynamics and calcium-dependent effectors that participate in these processes.
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Affiliation(s)
- Michelle K Tu
- Department of Physiology and Membrane Biology and Shriners Hospital for Children Northern California, University of California Davis, Sacramento, CA 95817, United States
| | - Jacqueline B Levin
- Department of Physiology and Membrane Biology and Shriners Hospital for Children Northern California, University of California Davis, Sacramento, CA 95817, United States
| | - Andrew M Hamilton
- Department of Physiology and Membrane Biology and Shriners Hospital for Children Northern California, University of California Davis, Sacramento, CA 95817, United States
| | - Laura N Borodinsky
- Department of Physiology and Membrane Biology and Shriners Hospital for Children Northern California, University of California Davis, Sacramento, CA 95817, United States.
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Zhang H, Sun AY, Kim JJ, Graham V, Finch EA, Nepliouev I, Zhao G, Li T, Lederer WJ, Stiber JA, Pitt GS, Bursac N, Rosenberg PB. STIM1-Ca2+ signaling modulates automaticity of the mouse sinoatrial node. Proc Natl Acad Sci U S A 2015; 112:E5618-27. [PMID: 26424448 PMCID: PMC4611639 DOI: 10.1073/pnas.1503847112] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Cardiac pacemaking is governed by specialized cardiomyocytes located in the sinoatrial node (SAN). SAN cells (SANCs) integrate voltage-gated currents from channels on the membrane surface (membrane clock) with rhythmic Ca(2+) release from internal Ca(2+) stores (Ca(2+) clock) to adjust heart rate to meet hemodynamic demand. Here, we report that stromal interaction molecule 1 (STIM1) and Orai1 channels, key components of store-operated Ca(2+) entry, are selectively expressed in SANCs. Cardiac-specific deletion of STIM1 in mice resulted in depletion of sarcoplasmic reticulum (SR) Ca(2+) stores of SANCs and led to SAN dysfunction, as was evident by a reduction in heart rate, sinus arrest, and an exaggerated autonomic response to cholinergic signaling. Moreover, STIM1 influenced SAN function by regulating ionic fluxes in SANCs, including activation of a store-operated Ca(2+) current, a reduction in L-type Ca(2+) current, and enhancing the activities of Na(+)/Ca(2+) exchanger. In conclusion, these studies reveal that STIM1 is a multifunctional regulator of Ca(2+) dynamics in SANCs that links SR Ca(2+) store content with electrical events occurring in the plasma membrane, thereby contributing to automaticity of the SAN.
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Affiliation(s)
- Hengtao Zhang
- Department of Medicine, Duke University School of Medicine, Durham, NC 27704
| | - Albert Y Sun
- Department of Medicine, Duke University School of Medicine, Durham, NC 27704
| | - Jong J Kim
- Department of Biomedical Engineering, Duke University, Durham, NC 27708
| | - Victoria Graham
- Department of Medicine, Duke University School of Medicine, Durham, NC 27704
| | - Elizabeth A Finch
- Department of Medicine, Duke University School of Medicine, Durham, NC 27704
| | - Igor Nepliouev
- Department of Medicine, Duke University School of Medicine, Durham, NC 27704
| | - Guiling Zhao
- Department of Physiology, Center for BioMedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Tianyu Li
- Department of Medicine, Duke University School of Medicine, Durham, NC 27704
| | - W J Lederer
- Department of Physiology, Center for BioMedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Jonathan A Stiber
- Department of Medicine, Duke University School of Medicine, Durham, NC 27704
| | - Geoffrey S Pitt
- Department of Medicine, Duke University School of Medicine, Durham, NC 27704
| | - Nenad Bursac
- Department of Biomedical Engineering, Duke University, Durham, NC 27708
| | - Paul B Rosenberg
- Department of Medicine, Duke University School of Medicine, Durham, NC 27704;
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15
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STIM1 enhances SR Ca2+ content through binding phospholamban in rat ventricular myocytes. Proc Natl Acad Sci U S A 2015; 112:E4792-801. [PMID: 26261328 DOI: 10.1073/pnas.1423295112] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In ventricular myocytes, the physiological function of stromal interaction molecule 1 (STIM1), an endo/sarcoplasmic reticulum (ER/SR) Ca(2+) sensor, is unclear with respect to its cellular localization, its Ca(2+)-dependent mobilization, and its action on Ca(2+) signaling. Confocal microscopy was used to measure Ca(2+) signaling and to track the cellular movement of STIM1 with mCherry and immunofluorescence in freshly isolated adult rat ventricular myocytes and those in short-term primary culture. We found that endogenous STIM1 was expressed at low but measureable levels along the Z-disk, in a pattern of puncta and linear segments consistent with the STIM1 localizing to the junctional SR (jSR). Depleting SR Ca(2+) using thapsigargin (2-10 µM) changed neither the STIM1 distribution pattern nor its mobilization rate, evaluated by diffusion coefficient measurements using fluorescence recovery after photobleaching. Two-dimensional blue native polyacrylamide gel electrophoresis and coimmunoprecipitation showed that STIM1 in the heart exists mainly as a large protein complex, possibly a multimer, which is not altered by SR Ca(2+) depletion. Additionally, we found no store-operated Ca(2+) entry in control or STIM1 overexpressing ventricular myocytes. Nevertheless, STIM1 overexpressing cells show increased SR Ca(2+) content and increased SR Ca(2+) leak. These changes in Ca(2+) signaling in the SR appear to be due to STIM1 binding to phospholamban and thereby indirectly activating SERCA2a (Sarco/endoplasmic reticulum Ca(2+) ATPase). We conclude that STIM1 binding to phospholamban contributes to the regulation of SERCA2a activity in the steady state and rate of SR Ca(2+) leak and that these actions are independent of store-operated Ca(2+) entry, a process that is absent in normal heart cells.
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16
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Tóth A, Fodor J, Vincze J, Oláh T, Juhász T, Zákány R, Csernoch L, Zádor E. The Effect of SERCA1b Silencing on the Differentiation and Calcium Homeostasis of C2C12 Skeletal Muscle Cells. PLoS One 2015; 10:e0123583. [PMID: 25893964 PMCID: PMC4404259 DOI: 10.1371/journal.pone.0123583] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 03/04/2015] [Indexed: 12/12/2022] Open
Abstract
The sarcoplasmic/endoplasmic reticulum Ca2+ATPases (SERCAs) are the main Ca2+ pumps which decrease the intracellular Ca2+ level by reaccumulating Ca2+ into the sarcoplasmic reticulum. The neonatal SERCA1b is the major Ca2+ pump in myotubes and young muscle fibers. To understand its role during skeletal muscle differentiation its synthesis has been interfered with specific shRNA sequence. Stably transfected clones showing significantly decreased SERCA1b expression (cloneC1) were selected for experiments. The expression of the regulatory proteins of skeletal muscle differentiation was examined either by Western-blot at the protein level for MyoD, STIM1, calsequestrin (CSQ), and calcineurin (CaN) or by RT-PCR for myostatin and MCIP1.4. Quantitative analysis revealed significant alterations in CSQ, STIM1, and CaN expression in cloneC1 as compared to control cells. To examine the functional consequences of the decreased expression of SERCA1b, repeated Ca2+-transients were evoked by applications of 120 mM KCl. The significantly higher [Ca2+]i measured at the 20th and 40th seconds after the beginning of KCl application (112±3 and 110±3 nM vs. 150±7 and 135±5 nM, in control and in cloneC1 cells, respectively) indicated a decreased Ca2+-uptake capability which was quantified by extracting the maximal pump rate (454±41 μM/s vs. 144±24 μM/s, in control and in cloneC1 cells). Furthermore, the rate of calcium release from the SR (610±60 vs. 377±64 μM/s) and the amount of calcium released (843±75 μM vs. 576±80 μM) were also significantly suppressed. These changes were also accompanied by a reduced activity of CaN in cells with decreased SERCA1b. In parallel, cloneC1 cells showed inhibited cell proliferation and decreased myotube nuclear numbers. Moreover, while cyclosporineA treatment suppressed the proliferation of parental cultures it had no effect on cloneC1 cells. SERCA1b is thus considered to play an essential role in the regulation of [Ca2+]i and its ab ovo gene silencing results in decreased skeletal muscle differentiation.
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Affiliation(s)
- Adrienn Tóth
- Department of Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - János Fodor
- Department of Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - János Vincze
- Department of Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Tamás Oláh
- Department of Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Tamás Juhász
- Department of Anatomy, Histology and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Róza Zákány
- Department of Anatomy, Histology and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - László Csernoch
- Department of Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
- * E-mail:
| | - Ernő Zádor
- Department of Biochemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
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17
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Liu J, Xin L, Benson VL, Allen DG, Ju YK. Store-operated calcium entry and the localization of STIM1 and Orai1 proteins in isolated mouse sinoatrial node cells. Front Physiol 2015; 6:69. [PMID: 25806000 PMCID: PMC4353302 DOI: 10.3389/fphys.2015.00069] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 02/19/2015] [Indexed: 01/01/2023] Open
Abstract
In many non-excitable and excitable cells, store-operated calcium entry (SOCE) represents an additional pathway for calcium entry upon Ca2+ store depletion. In a previous study, we demonstrated SOCE activity in intact mouse cardiac pacemaker tissue, specifically from sinoatrial node (SAN) tissue. However, store content as a key determinant of SOCE activity is difficult to measure in intact SAN tissue. Therefore, to investigate the interaction between SOCE and store content and its role in cardiac pacemaking, it is necessary to investigate SOCE activity in single cardiac pacemaker cells. Furthermore, recent studies in other tissues have identified two new proteins involved in SOCE, stromal interacting molecule (STIM), which is an ER Ca2+ sensor, and the surface membrane channel Orai, a prototypic gene encoding for SOCE. However, whether STIM and Orai are expressed in native pacemaker cells is still unknown. In this current study, we examined SOCE activity in single firing pacemaker cells isolated from mouse sinoatrial node tissue. We found a significant rise in Ca2+ entry in response to Ca2+ store depletion. SOCE blockers reduced the amplitude and frequency of spontaneous Ca2+ transients and reduced Ca2+ store content. We demonstrated for the first time that STIM and Orai are expressed in pacemaker cells. After store depletion, STIM1 redistributed to the cell periphery and showed increased co-localization with surface membrane located Orai1, indicating a possible involvement of these proteins in SOCE activity in native cardiac pacemaker cells. These results suggest the novel concept that SOCE plays a functional role in regulating intracellular Ca2+ of cardiac pacemaker cells.
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Affiliation(s)
- Jie Liu
- School of Medical Sciences and Bosch Institute, University of Sydney Sydney, NSW, Australia
| | - Li Xin
- Victor Chang Cardiac Research Institute Sydney, NSW, Australia
| | - Victoria L Benson
- School of Medical Sciences and Bosch Institute, University of Sydney Sydney, NSW, Australia
| | - David G Allen
- School of Medical Sciences and Bosch Institute, University of Sydney Sydney, NSW, Australia
| | - Yue-Kun Ju
- School of Medical Sciences and Bosch Institute, University of Sydney Sydney, NSW, Australia
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18
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The neonatal sarcoplasmic/endoplasmic reticulum calcium ATPase (SERCA1b): a neglected pump in scope. Pflugers Arch 2014; 467:1395-1401. [DOI: 10.1007/s00424-014-1671-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 12/04/2014] [Accepted: 12/08/2014] [Indexed: 01/03/2023]
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19
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Kósa M, Brinyiczki K, van Damme P, Goemans N, Hancsák K, Mendler L, Zádor E. The neonatal sarcoplasmic reticulum Ca2+-ATPase gives a clue to development and pathology in human muscles. J Muscle Res Cell Motil 2014; 36:195-203. [PMID: 25487304 DOI: 10.1007/s10974-014-9403-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 12/03/2014] [Indexed: 01/07/2023]
Abstract
The sarcoplasmic/endoplasmic reticulum calcium ATPase 1 (SERCA1) has two muscle specific splice isoforms; SERCA1a in fast-type adult and SERCA1b in neonatal and regenerating skeletal muscles. At the protein level the only difference between these two isoforms is that SERCA1a has C-terminal glycine while SERCA1b has an octapeptide tail instead. This makes the generation of a SERCA1a specific antibody not feasible. The switch between the two isoforms is a hallmark of differentiation so we describe here a method based on the signal ratios of the SERCA1b specific and pan SERCA1 antibodies to estimate the SERCA1b/SERCA1a dominance on immunoblot of human muscles. Using this method we showed that unlike in mouse and rat, SERCA1b was only expressed in pre-matured infant leg and arm muscles; it was replaced by SERCA1a in more matured neonatal muscles and was completely absent in human foetal and neonatal diaphragms. Interestingly, only SERCA1a and no SERCA1b were detected in muscles of 7-12 years old boys with Duchenne, a degenerative-regenerative muscular dystrophy. However, in adult patients with myotonic dystrophy type 2 (DM2), the SERCA1b dominated over SERCA1a. Thus the human SERCA1b has a different expression pattern from that of rodents and it is associated with DM2.
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Affiliation(s)
- Magdolna Kósa
- Department of Biochemistry, Faculty of General Medicine, University of Szeged, Dóm tér 9, H-6720, Szeged, Hungary
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20
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Jayawardena TM, Finch EA, Zhang L, Zhang H, Hodgkinson CP, Pratt RE, Rosenberg PB, Mirotsou M, Dzau VJ. MicroRNA induced cardiac reprogramming in vivo: evidence for mature cardiac myocytes and improved cardiac function. Circ Res 2014; 116:418-24. [PMID: 25351576 DOI: 10.1161/circresaha.116.304510] [Citation(s) in RCA: 180] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
RATIONALE A major goal for the treatment of heart tissue damaged by cardiac injury is to develop strategies for restoring healthy heart muscle through the regeneration and repair of damaged myocardium. We recently demonstrated that administration of a specific combination of microRNAs (miR combo) into the infarcted myocardium leads to direct in vivo reprogramming of noncardiac myocytes to cardiac myocytes. However, the biological and functional consequences of such reprogramming are not yet known. OBJECTIVE The aim of this study was to determine whether noncardiac myocytes directly reprogrammed using miRNAs in vivo develop into mature functional cardiac myocytes in situ, and whether reprogramming leads to improvement of cardiac function. METHODS AND RESULTS We subjected fibroblast-specific protein 1-Cre mice/tandem dimer Tomato (tdTomato) mice to cardiac injury by permanent ligation of the left anterior descending coronary artery and injected lentiviruses encoding miR combo or a control nontargeting miRNA. miR combo significantly increased the number of reprogramming events in vivo. Five to 6 weeks after injury, morphological and physiological properties of tdTomato(-) and tdTomato(+) cardiac myocyte-like cells were analyzed ex vivo. tdTomato(+) cells expressed cardiac myocyte markers, sarcomeric organization, excitation-contraction coupling, and action potentials characteristic of mature ventricular cardiac myocytes (tdTomato(-) cells). Reprogramming was associated with improvement of cardiac function, as analyzed by serial echocardiography. There was a time delayed and progressive improvement in fractional shortening and other measures of ventricular function, indicating that miR combo promotes functional recovery of damaged myocardium. CONCLUSIONS The findings from this study further validate the potential use of miRNA-mediated reprogramming as a therapeutic approach to promote cardiac regeneration after myocardial injury.
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Affiliation(s)
- Tilanthi M Jayawardena
- From the Mandel Center for Hypertension Research (T.M.J., L.Z., C.P.H., R.E.P., M.M., V.J.D.) and the Ion Channel Research Unit (E.A.F., H.Z., P.B.R.), Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, NC; and Sarah Steadman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC (P.B.R.)
| | - Elizabeth A Finch
- From the Mandel Center for Hypertension Research (T.M.J., L.Z., C.P.H., R.E.P., M.M., V.J.D.) and the Ion Channel Research Unit (E.A.F., H.Z., P.B.R.), Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, NC; and Sarah Steadman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC (P.B.R.)
| | - Lunan Zhang
- From the Mandel Center for Hypertension Research (T.M.J., L.Z., C.P.H., R.E.P., M.M., V.J.D.) and the Ion Channel Research Unit (E.A.F., H.Z., P.B.R.), Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, NC; and Sarah Steadman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC (P.B.R.)
| | - Hengtao Zhang
- From the Mandel Center for Hypertension Research (T.M.J., L.Z., C.P.H., R.E.P., M.M., V.J.D.) and the Ion Channel Research Unit (E.A.F., H.Z., P.B.R.), Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, NC; and Sarah Steadman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC (P.B.R.)
| | - Conrad P Hodgkinson
- From the Mandel Center for Hypertension Research (T.M.J., L.Z., C.P.H., R.E.P., M.M., V.J.D.) and the Ion Channel Research Unit (E.A.F., H.Z., P.B.R.), Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, NC; and Sarah Steadman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC (P.B.R.)
| | - Richard E Pratt
- From the Mandel Center for Hypertension Research (T.M.J., L.Z., C.P.H., R.E.P., M.M., V.J.D.) and the Ion Channel Research Unit (E.A.F., H.Z., P.B.R.), Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, NC; and Sarah Steadman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC (P.B.R.)
| | - Paul B Rosenberg
- From the Mandel Center for Hypertension Research (T.M.J., L.Z., C.P.H., R.E.P., M.M., V.J.D.) and the Ion Channel Research Unit (E.A.F., H.Z., P.B.R.), Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, NC; and Sarah Steadman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC (P.B.R.)
| | - Maria Mirotsou
- From the Mandel Center for Hypertension Research (T.M.J., L.Z., C.P.H., R.E.P., M.M., V.J.D.) and the Ion Channel Research Unit (E.A.F., H.Z., P.B.R.), Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, NC; and Sarah Steadman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC (P.B.R.)
| | - Victor J Dzau
- From the Mandel Center for Hypertension Research (T.M.J., L.Z., C.P.H., R.E.P., M.M., V.J.D.) and the Ion Channel Research Unit (E.A.F., H.Z., P.B.R.), Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, NC; and Sarah Steadman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC (P.B.R.).
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21
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STIM1 negatively regulates Ca²⁺ release from the sarcoplasmic reticulum in skeletal myotubes. Biochem J 2013; 453:187-200. [PMID: 23668188 DOI: 10.1042/bj20130178] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
STIM1 (stromal interaction molecule 1) mediates SOCE (store-operated Ca²⁺ entry) in skeletal muscle. However, the direct role(s) of STIM1 in skeletal muscle, such as Ca²⁺ release from the SR (sarcoplasmic reticulum) for muscle contraction, have not been identified. The times required for the maximal expression of endogenous STIM1 or Orai1, or for the appearance of puncta during the differentiation of mouse primary skeletal myoblasts to myotubes, were all different, and the formation of puncta was detected with no stimulus during differentiation, suggesting that, in skeletal muscle, the formation of puncta is a part of the differentiation. Wild-type STIM1 and two STIM1 mutants (Triple mutant, missing Ca²⁺-sensing residues but possessing the intact C-terminus; and E136X, missing the C-terminus) were overexpressed in the myotubes. The wild-type STIM1 increased SOCE, whereas neither mutant had an effect on SOCE. It was interesting that increases in the formation of puncta were observed in the Triple mutant as well as in wild-type STIM1, suggesting that SOCE-irrelevant puncta could exist in skeletal muscle. On the other hand, overexpression of wild-type or Triple mutant, but not E136X, attenuated Ca²⁺ releases from the SR in response to KCl [evoking ECC (excitation-contraction coupling) via activating DHPR (dihydropyridine receptor)] in a dominant-negative manner. The attenuation was removed by STIM1 knockdown, and STIM1 was co-immunoprecipitated with DHRP in a Ca²⁺-independent manner. These results suggest that STIM1 negatively regulates Ca²⁺ release from the SR through the direct interaction of the STIM1 C-terminus with DHPR, and that STIM1 is involved in both ECC and SOCE in skeletal muscle.
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22
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Takamori M. Structure of the neuromuscular junction: function and cooperative mechanisms in the synapse. Ann N Y Acad Sci 2013; 1274:14-23. [PMID: 23252893 DOI: 10.1111/j.1749-6632.2012.06784.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
As an overview of the structure of the neuromuscular junction, three items are described focusing on cooperative mechanisms involving the synapse and leading to muscle contraction: (1) presynaptic acetylcholine release regulated by vesicle cycling (exocytosis and endocytosis); the fast-mode of endocytosis requires a large influx of external Ca(2+) and is promoted by the activation of G protein-coupled receptors and receptor tyrosine kinases; (2) postsynaptic acetylcholine receptor clustering mediated by the muscle-specific, Dok7-stimulated tyrosine kinase (MuSK) through two signaling mechanisms: one via agrin-Lrp4-MuSK (Ig1/2 domains) and the second via Wnt-MuSK (Frizzled-like cysteine-rich domain)-adaptor Dishevelled; Wnts/MuSK and Lrp4 direct a retrograde signal to presynaptic differentiation; (3) muscle contractile machinery regulated by Ca(2+) -release and Ca(2+) -influx channels, including the depolarization-activated ryanodine receptor-1 and the receptor- and/or store-operated transient receptor potential canonical. The first mechanism is dysfunctional in Lambert-Eaton myasthenic syndrome, the second in anti-acetylcholine receptor-negative myasthenia gravis (MG), and the third in thymoma-associated MG.
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23
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Soboloff J, Rothberg BS, Madesh M, Gill DL. STIM proteins: dynamic calcium signal transducers. Nat Rev Mol Cell Biol 2012; 13:549-65. [PMID: 22914293 DOI: 10.1038/nrm3414] [Citation(s) in RCA: 508] [Impact Index Per Article: 42.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Stromal interaction molecule (STIM) proteins function in cells as dynamic coordinators of cellular calcium (Ca(2+)) signals. Spanning the endoplasmic reticulum (ER) membrane, they sense tiny changes in the levels of Ca(2+) stored within the ER lumen. As ER Ca(2+) is released to generate primary Ca(2+) signals, STIM proteins undergo an intricate activation reaction and rapidly translocate into junctions formed between the ER and the plasma membrane. There, STIM proteins tether and activate the highly Ca(2+)-selective Orai channels to mediate finely controlled Ca(2+) signals and to homeostatically balance cellular Ca(2+). Details are emerging on the remarkable organization within these STIM-induced junctional microdomains and the identification of new regulators and alternative target proteins for STIM.
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Affiliation(s)
- Jonathan Soboloff
- Department of Biochemistry, Temple University School of Medicine, 3400 North Broad Street, Philadelphia, Pennsylvania 19140, USA
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