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Xu J, Liao C, Yin CC, Li G, Zhu Y, Sun F. In situ structural insights into the excitation-contraction coupling mechanism of skeletal muscle. Sci Adv 2024; 10:eadl1126. [PMID: 38507485 PMCID: PMC10954225 DOI: 10.1126/sciadv.adl1126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 02/12/2024] [Indexed: 03/22/2024]
Abstract
Excitation-contraction coupling (ECC) is a fundamental mechanism in control of skeletal muscle contraction and occurs at triad junctions, where dihydropyridine receptors (DHPRs) on transverse tubules sense excitation signals and then cause calcium release from the sarcoplasmic reticulum via coupling to type 1 ryanodine receptors (RyR1s), inducing the subsequent contraction of muscle filaments. However, the molecular mechanism remains unclear due to the lack of structural details. Here, we explored the architecture of triad junction by cryo-electron tomography, solved the in situ structure of RyR1 in complex with FKBP12 and calmodulin with the resolution of 16.7 Angstrom, and found the intact RyR1-DHPR supercomplex. RyR1s arrange into two rows on the terminal cisternae membrane by forming right-hand corner-to-corner contacts, and tetrads of DHPRs bind to RyR1s in an alternating manner, forming another two rows on the transverse tubule membrane. This unique arrangement is important for synergistic calcium release and provides direct evidence of physical coupling in ECC.
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Affiliation(s)
- Jiashu Xu
- Key Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chenyi Liao
- Laboratory of Molecular Modeling and Design, State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Chang-Cheng Yin
- Department of Biophysics, The Health Science Center, Peking University, Beijing 100191, China
- Electron Microscopy Analysis Laboratory, The Health Science Center, Peking University, Beijing 100191, China
- Center for Protein Science, Peking University, Beijing 100871, China
| | - Guohui Li
- Laboratory of Molecular Modeling and Design, State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yun Zhu
- Key Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Fei Sun
- Key Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Biological Imaging, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, Guangdong, 510005, China
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Lai P, Hille SS, Subramanian H, Wiegmann R, Roser P, Müller OJ, Nikolaev VO, De Jong KA. Remodelling of cAMP dynamics within the SERCA2a microdomain in heart failure with preserved ejection fraction caused by obesity and type 2 diabetes. Cardiovasc Res 2024; 120:273-285. [PMID: 38099489 PMCID: PMC10939460 DOI: 10.1093/cvr/cvad178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 08/03/2023] [Accepted: 09/23/2023] [Indexed: 02/10/2024] Open
Abstract
AIMS Despite massive efforts, we remain far behind in our attempts to identify effective therapies to treat heart failure with preserved ejection fraction (HFpEF). Diastolic function is critically regulated by sarcoplasmic/endoplasmic reticulum (SR) calcium ATPase 2a (SERCA2a), which forms a functional cardiomyocyte (CM) microdomain where 3',5'-cyclic adenosine monophosphate (cAMP) produced upon β-adrenergic receptor (β-AR) stimulation leads to phospholamban (PLN) phosphorylation and facilitated Ca2+ re-uptake. METHODS AND RESULTS To visualize real-time cAMP dynamics in the direct vicinity of SERCA2a in healthy and diseased myocytes, we generated a novel mouse model on the leprdb background that stably expresses the Epac1-PLN Förster resonance energy transfer biosensor. Mice homozygous for the leprdb mutation (db/db) developed obesity and type 2 diabetes and presented with a HFpEF phenotype, evident by mild left ventricular hypertrophy and elevated left atria filling pressures. Live cell imaging uncovered a substantial β2-AR subtype stimulated cAMP response within the PLN/SERCA2a microdomain of db/db but not healthy control (db/+) CMs, which was accompanied by increased PLN phosphorylation and accelerated calcium re-uptake. Importantly, db/db CMs also exhibited a desensitization of β1-AR stimulated cAMP pools within the PLN/SERCA2a microdomain, which was accompanied by a blunted lusitropic effect, suggesting that the increased β2-AR control is an intrinsic compensatory mechanism to maintain PLN/SERCA2a-mediated calcium dynamics and cardiac relaxation. Mechanistically, this was due to a local loss of cAMP-degrading phosphodiesterase 4 associated specifically with the PLN/SERCA2a complex. CONCLUSION These newly identified alterations of cAMP dynamics at the subcellular level in HFpEF should provide mechanistic understanding of microdomain remodelling and pave the way towards new therapies.
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Affiliation(s)
- Ping Lai
- Institute of Experimental Cardiovascular Research, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246 Hamburg, Germany
- German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Martinistr. 52, D-20246 Hamburg, Germany
- Department of Cardiology, Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, First Affiliated Hospital of Gannan Medical University, 341000 Ganzhou, China
| | - Susanne S Hille
- German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Martinistr. 52, D-20246 Hamburg, Germany
- Department of Internal Medicine III, University Hospital Schleswig-Holstein, University of Kiel, Arnold-Heller-Str. 3, D-24105, Kiel, Germany
| | - Hariharan Subramanian
- Institute of Experimental Cardiovascular Research, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246 Hamburg, Germany
- German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Martinistr. 52, D-20246 Hamburg, Germany
| | - Robert Wiegmann
- Institute of Experimental Cardiovascular Research, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246 Hamburg, Germany
| | - Pia Roser
- Department of Endocrinology and Diabetes, University Medical Center Hamburg-Eppendorf, Martinistr. 52, Hamburg D-20246, Germany
| | - Oliver J Müller
- German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Martinistr. 52, D-20246 Hamburg, Germany
- Department of Internal Medicine III, University Hospital Schleswig-Holstein, University of Kiel, Arnold-Heller-Str. 3, D-24105, Kiel, Germany
| | - Viacheslav O Nikolaev
- Institute of Experimental Cardiovascular Research, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246 Hamburg, Germany
- German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Martinistr. 52, D-20246 Hamburg, Germany
| | - Kirstie A De Jong
- Institute of Experimental Cardiovascular Research, University Medical Center Hamburg-Eppendorf, Martinistr. 52, D-20246 Hamburg, Germany
- German Center for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Martinistr. 52, D-20246 Hamburg, Germany
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Xia Y, Zhang XH, Yamaguchi N, Morad M. Point mutations in RyR2 Ca2+-binding residues of human cardiomyocytes cause cellular remodelling of cardiac excitation contraction-coupling. Cardiovasc Res 2024; 120:44-55. [PMID: 37890099 PMCID: PMC10898933 DOI: 10.1093/cvr/cvad163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 07/17/2023] [Accepted: 09/26/2023] [Indexed: 10/29/2023] Open
Abstract
AIMS CRISPR/Cas9 gene edits of cardiac ryanodine receptor (RyR2) in human-induced pluripotent stem cell derived cardiomyocytes (hiPSC-CMs) provide a novel platform for introducing mutations in RyR2 Ca2+-binding residues and examining the resulting excitation contraction (EC)-coupling remodelling consequences. METHODS AND RESULTS Ca2+-signalling phenotypes of mutations in RyR2 Ca2+-binding site residues associated with cardiac arrhythmia (RyR2-Q3925E) or not proven to cause cardiac pathology (RyR2-E3848A) were determined using ICa- and caffeine-triggered Ca2+ releases in voltage-clamped and total internal reflection fluorescence-imaged wild type and mutant cardiomyocytes infected with sarcoplasmic reticulum (SR)-targeted ER-GCaMP6 probe. (i) ICa- and caffeine-triggered Fura-2 or ER-GCaMP6 signals were suppressed, even when ICa was significantly enhanced in Q3925E and E3848A mutant cardiomyocytes; (ii) spontaneous beating (Fura-2 Ca2+ transients) persisted in mutant cells without the SR-release signals; (iii) while 5-20 mM caffeine failed to trigger Ca2+-release in voltage-clamped mutant cells, only ∼20% to ∼70% of intact myocytes responded respectively to caffeine; (iv) and 20 mM caffeine transients, however, activated slowly, were delayed, and variably suppressed by 2-APB, FCCP, or ruthenium red. CONCLUSION Mutating RyR2 Ca2+-binding residues, irrespective of their reported pathogenesis, suppressed both ICa- and caffeine-triggered Ca2+ releases, suggesting interaction between Ca2+- and caffeine-binding sites. Enhanced transmembrane calcium influx and remodelling of EC-coupling pathways may underlie the persistence of spontaneous beating in Ca2+-induced Ca2+ release-suppressed mutant myocytes.
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Affiliation(s)
- Yanli Xia
- Cardiac Signaling Center of University of South Carolina, Medical University of South Carolina and Clemson University, 68 President Street, Bioengineering building Rm 306, Charleston, SC 29425, USA
| | - Xiao-hua Zhang
- Cardiac Signaling Center of University of South Carolina, Medical University of South Carolina and Clemson University, 68 President Street, Bioengineering building Rm 306, Charleston, SC 29425, USA
| | - Naohiro Yamaguchi
- Cardiac Signaling Center of University of South Carolina, Medical University of South Carolina and Clemson University, 68 President Street, Bioengineering building Rm 306, Charleston, SC 29425, USA
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, 68 President Street, Bioengineering building Rm 306, Charleston, SC 29425, USA
| | - Martin Morad
- Cardiac Signaling Center of University of South Carolina, Medical University of South Carolina and Clemson University, 68 President Street, Bioengineering building Rm 306, Charleston, SC 29425, USA
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, 68 President Street, Bioengineering building Rm 306, Charleston, SC 29425, USA
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Hall DD, Takeshima H, Song LS. Structure, Function, and Regulation of the Junctophilin Family. Annu Rev Physiol 2024; 86:123-147. [PMID: 37931168 PMCID: PMC10922073 DOI: 10.1146/annurev-physiol-042022-014926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2023]
Abstract
In both excitable and nonexcitable cells, diverse physiological processes are linked to different calcium microdomains within nanoscale junctions that form between the plasma membrane and endo-sarcoplasmic reticula. It is now appreciated that the junctophilin protein family is responsible for establishing, maintaining, and modulating the structure and function of these junctions. We review foundational findings from more than two decades of research that have uncovered how junctophilin-organized ultrastructural domains regulate evolutionarily conserved biological processes. We discuss what is known about the junctophilin family of proteins. Our goal is to summarize the current knowledge of junctophilin domain structure, function, and regulation and to highlight emerging avenues of research that help our understanding of the transcriptional, translational, and post-translational regulation of this gene family and its roles in health and during disease.
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Affiliation(s)
- Duane D Hall
- Department of Internal Medicine, Division of Cardiovascular Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA; ,
| | - Hiroshi Takeshima
- Department of Biological Chemistry, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Long-Sheng Song
- Department of Internal Medicine, Division of Cardiovascular Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA; ,
- Department of Biochemistry and Molecular Biology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA
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Kanazawa Y, Takahashi T, Nagano M, Koinuma S, Shigeyoshi Y. The Effects of Aging on Sarcoplasmic Reticulum-Related Factors in the Skeletal Muscle of Mice. Int J Mol Sci 2024; 25:2148. [PMID: 38396828 PMCID: PMC10889371 DOI: 10.3390/ijms25042148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 02/04/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
The pathogenesis of sarcopenia includes the dysfunction of calcium homeostasis associated with the sarcoplasmic reticulum; however, the localization in sarcoplasmic reticulum-related factors and differences by myofiber type remain unclear. Here, we investigated the effects of aging on sarcoplasmic reticulum-related factors in the soleus (slow-twitch) and gastrocnemius (fast-twitch) muscles of 3- and 24-month-old male C57BL/6J mice. There were no notable differences in the skeletal muscle weight of these 3- and 24-month-old mice. The expression of Atp2a1, Atp2a2, Sln, and Pln increased with age in the gastrocnemius muscles, but not in the soleus muscles. Subsequently, immunohistochemical analysis revealed ectopic sarcoplasmic reticulum calcium ion ATPase (SERCA) 1 and SERCA2a immunoreactivity only in the gastrocnemius muscles of old mice. Histochemical and transmission electron microscope analysis identified tubular aggregate (TA), an aggregation of the sarcoplasmic reticulum, in the gastrocnemius muscles of old mice. Dihydropyridine receptor α1, ryanodine receptor 1, junctophilin (JPH) 1, and JPH2, which contribute to sarcoplasmic reticulum function, were also localized in or around the TA. Furthermore, JPH1 and JPH2 co-localized with matrix metalloproteinase (MMP) 2 around the TA. These results suggest that sarcoplasmic reticulum-related factors are localized in or around TAs that occur in fast-twitch muscle with aging, but some of them might be degraded by MMP2.
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Affiliation(s)
- Yuji Kanazawa
- Department of Physical Therapy, Hokuriku University, Kanazawa 920-1180, Ishikawa, Japan
- Department of Anatomy and Neurobiology, Faculty of Medicine, Kindai University, Osakasayama 589-8511, Osaka, Japan; (M.N.); (S.K.); (Y.S.)
| | - Tatsuo Takahashi
- Department of Clinical Pharmacology, Hokuriku University, Kanazawa 920-1181, Ishikawa, Japan;
| | - Mamoru Nagano
- Department of Anatomy and Neurobiology, Faculty of Medicine, Kindai University, Osakasayama 589-8511, Osaka, Japan; (M.N.); (S.K.); (Y.S.)
| | - Satoshi Koinuma
- Department of Anatomy and Neurobiology, Faculty of Medicine, Kindai University, Osakasayama 589-8511, Osaka, Japan; (M.N.); (S.K.); (Y.S.)
| | - Yasufumi Shigeyoshi
- Department of Anatomy and Neurobiology, Faculty of Medicine, Kindai University, Osakasayama 589-8511, Osaka, Japan; (M.N.); (S.K.); (Y.S.)
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Heinis FI, Thompson BR, Gulati R, Wheelwright M, Metzger JM. Myofilament-based physiological regulatory compensation preserves diastolic function in failing hearts with severe Ca2+ handling deficits. JCI Insight 2024; 9:e163334. [PMID: 38329806 DOI: 10.1172/jci.insight.163334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 02/02/2024] [Indexed: 02/10/2024] Open
Abstract
Severe dysfunction in cardiac muscle intracellular Ca2+ handling is a common pathway underlying heart failure. Here we used an inducible genetic model of severe Ca2+ cycling dysfunction by the targeted temporal gene ablation of the cardiac Ca2+ ATPase, SERCA2, in otherwise normal adult mice. In this model, in vivo heart performance was minimally affected initially, even though Serca2a protein was markedly reduced. The mechanism underlying the sustained in vivo heart performance in the weeks prior to complete heart pump failure and death is not clear and is important to understand. Studies were primarily focused on understanding how in vivo diastolic function could be relatively normal under conditions of marked Serca2a deficiency. Interestingly, data show increased cardiac troponin I (cTnI) serine 23/24 phosphorylation content in hearts upon Serca2a ablation in vivo. We report that hearts isolated from the Serca2-deficient mice retained near normal heart pump functional responses to β-adrenergic stimulation. Unexpectedly, using genetic complementation models, in concert with inducible Serca2 ablation, data show that Serca2a-deficient hearts that also lacked the central β-adrenergic signaling-dependent Serca2a negative regulator, phospholamban (PLN), had severe diastolic dysfunction that could still be corrected by β-adrenergic stimulation. Notably, integrating a serines 23/24-to-alanine PKA-refractory sarcomere incorporated cTnI molecular switch complex in mice deficient in Serca2 showed blunting of β-adrenergic stimulation-mediated enhanced diastolic heart performance. Taken together, these data provide evidence of a compensatory regulatory role of the myofilaments as a critical physiological bridging mechanism to aid in preserving heart diastolic performance in failing hearts with severe Ca2+ handling deficits.
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Jungbluth H, Famili DT, Helmich RC, Previtali S, Voermans NC. "RYR1 and the cerebellum": scientific commentary on "Defective Cerebellar Ryanodine Receptor Type 1 and Endoplasmic Reticulum Calcium 'Leak' in Tremor Pathophysiology". Acta Neuropathol 2024; 147:33. [PMID: 38326582 PMCID: PMC10850253 DOI: 10.1007/s00401-024-02687-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/05/2024] [Accepted: 01/05/2024] [Indexed: 02/09/2024]
Affiliation(s)
- Heinz Jungbluth
- Department of Paediatric Neurology, Neuromuscular Service, Evelina London Children's Hospital, Guy's and St. Thomas' Hospital NHS Foundation Trust, Children's Neurosciences Centre, F02 - Becket House, Lambeth Palace Road, London, SE1 7EU, UK.
- Randall Centre for Cell and Molecular Biophysics, Muscle Signalling Section, Faculty of Life Sciences and Medicine (FoLSM), King's College London, London, UK.
| | - Dennis T Famili
- Department of Paediatric Neurology, Neuromuscular Service, Evelina London Children's Hospital, Guy's and St. Thomas' Hospital NHS Foundation Trust, Children's Neurosciences Centre, F02 - Becket House, Lambeth Palace Road, London, SE1 7EU, UK
| | - Rick C Helmich
- Department of Neurology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Stefano Previtali
- Neuromuscular Repair Unit, Division of Neuroscience, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Nicol C Voermans
- Department of Neurology, Radboud University Medical Centre, Nijmegen, The Netherlands
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Ren AJ, Wei C, Liu YJ, Liu M, Wang P, Fan J, Wang K, Zhang S, Qin Z, Ren QX, Zheng Y, Chen YX, Xie Z, Gao L, Zhu Y, Zhang Y, Yang HT, Zhang WJ. ZBTB20 Regulates SERCA2a Activity and Myocardial Contractility Through Phospholamban. Circ Res 2024; 134:252-265. [PMID: 38166470 DOI: 10.1161/circresaha.123.323798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 12/20/2023] [Indexed: 01/04/2024]
Abstract
BACKGROUND Intracellular Ca2+ cycling determines myocardial contraction and relaxation in response to physiological demands. SERCA2a (sarcoplasmic/endoplasmic reticulum Ca2+-ATPase 2a) is responsible for the sequestration of cytosolic Ca2+ into intracellular stores during cardiac relaxation, and its activity is reversibly inhibited by PLN (phospholamban). However, the regulatory hierarchy of SERCA2a activity remains unclear. METHODS Cardiomyocyte-specific ZBTB20 knockout mice were generated by crossing ZBTB20flox mice with Myh6-Cre mice. Echocardiography, blood pressure measurements, Langendorff perfusion, histological analysis and immunohistochemistry, quantitative reverse transcription-PCR, Western blot analysis, electrophysiological measurements, and chromatin immunoprecipitation assay were performed to clarify the phenotype and elucidate the molecular mechanisms. RESULTS Specific ablation of ZBTB20 in cardiomyocyte led to a significant increase in basal myocardial contractile parameters both in vivo and in vitro, accompanied by an impairment in cardiac reserve and exercise capacity. Moreover, the cardiomyocytes lacking ZBTB20 showed an increase in sarcoplasmic reticular Ca2+ content and exhibited a remarkable enhancement in both SERCA2a activity and electrically stimulated contraction. Mechanistically, PLN expression was dramatically reduced in cardiomyocytes at the mRNA and protein levels by ZBTB20 deletion or silencing, and PLN overexpression could largely restore the basal contractility in ZBTB20-deficient cardiomyocytes. CONCLUSIONS These data point to ZBTB20 as a fine-tuning modulator of PLN expression and SERCA2a activity, thereby offering new perspective on the regulation of basal contractility in the mammalian heart.
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Affiliation(s)
- An-Jing Ren
- Department of Pathophysiology, Naval Medical University, Shanghai, China (A.-J.R., C.W., M.L., P.W., K.W., Z.Q., Q.-X.R., Y.-X.C., W.J.Z.)
- Experimental Teaching Center, College of Basic Medical Sciences, Naval Medical University, Shanghai, China (A.-J.R., J.F.)
| | - Chunchun Wei
- Department of Pathophysiology, Naval Medical University, Shanghai, China (A.-J.R., C.W., M.L., P.W., K.W., Z.Q., Q.-X.R., Y.-X.C., W.J.Z.)
| | - Ya-Jin Liu
- NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Tianjin Institute of Endocrinology and Chu Hsien-I Memorial Hospital, Tianjin Medical University Tianjin, China (Y.-J.L., Y. Zhu, W.J.Z.)
| | - Mengna Liu
- Department of Pathophysiology, Naval Medical University, Shanghai, China (A.-J.R., C.W., M.L., P.W., K.W., Z.Q., Q.-X.R., Y.-X.C., W.J.Z.)
| | - Ping Wang
- Department of Pathophysiology, Naval Medical University, Shanghai, China (A.-J.R., C.W., M.L., P.W., K.W., Z.Q., Q.-X.R., Y.-X.C., W.J.Z.)
| | - Juan Fan
- Experimental Teaching Center, College of Basic Medical Sciences, Naval Medical University, Shanghai, China (A.-J.R., J.F.)
| | - Kai Wang
- Department of Pathophysiology, Naval Medical University, Shanghai, China (A.-J.R., C.W., M.L., P.W., K.W., Z.Q., Q.-X.R., Y.-X.C., W.J.Z.)
| | - Sha Zhang
- Department of Cardiovascular Diseases, Changhai Hospital, Naval Medical University, Shanghai, China (S.Z.)
| | - Zhenbang Qin
- Department of Pathophysiology, Naval Medical University, Shanghai, China (A.-J.R., C.W., M.L., P.W., K.W., Z.Q., Q.-X.R., Y.-X.C., W.J.Z.)
| | - Qiu-Xiao Ren
- Department of Pathophysiology, Naval Medical University, Shanghai, China (A.-J.R., C.W., M.L., P.W., K.W., Z.Q., Q.-X.R., Y.-X.C., W.J.Z.)
| | - Yanjun Zheng
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Laboratory of Molecular Cardiology, Shanghai Institute of Nutrition and Health, Chinese Academy of Sciences, China (Y. Zheng, H.-T.Y.)
| | - Yu-Xia Chen
- Department of Pathophysiology, Naval Medical University, Shanghai, China (A.-J.R., C.W., M.L., P.W., K.W., Z.Q., Q.-X.R., Y.-X.C., W.J.Z.)
| | - Zhifang Xie
- Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Institute of Early Life Health, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, China (Z.X.)
| | - Ling Gao
- Translational Medical Center for Stem Cell Therapy and Institute for Regenerative Medicine, Shanghai East Hospital, Tongji University School of Medicine, China (L.G.)
| | - Yi Zhu
- NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Tianjin Institute of Endocrinology and Chu Hsien-I Memorial Hospital, Tianjin Medical University Tianjin, China (Y.-J.L., Y. Zhu, W.J.Z.)
| | - Youyi Zhang
- Institute of Vascular Medicine, National Key Laboratory of Cardiovascular Homeostasis and Remodeling, Peking University Third Hospital, Beijing, China (Y. Zhang)
| | - Huang-Tian Yang
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Laboratory of Molecular Cardiology, Shanghai Institute of Nutrition and Health, Chinese Academy of Sciences, China (Y. Zheng, H.-T.Y.)
| | - Weiping J Zhang
- Department of Pathophysiology, Naval Medical University, Shanghai, China (A.-J.R., C.W., M.L., P.W., K.W., Z.Q., Q.-X.R., Y.-X.C., W.J.Z.)
- NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Tianjin Institute of Endocrinology and Chu Hsien-I Memorial Hospital, Tianjin Medical University Tianjin, China (Y.-J.L., Y. Zhu, W.J.Z.)
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Mundiña-Weilenmann C. Seeking for Regulatory Mechanisms of Phospholamban Expression. Circ Res 2024; 134:266-268. [PMID: 38300986 DOI: 10.1161/circresaha.124.324109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Affiliation(s)
- Cecilia Mundiña-Weilenmann
- Centro de Investigaciones Cardiovasculares, CCT-CONICET La Plata, Cátedra de Fisiología y Física Biológica, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Argentina
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Mattiazzi A, Kranias EG. Unleashing the Power of Genetics: PLN Ablation, Phospholambanopathies and Evolving Challenges. Circ Res 2024; 134:138-142. [PMID: 38236951 DOI: 10.1161/circresaha.123.323053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Affiliation(s)
- Alicia Mattiazzi
- Centro de Investigaciones Cardiovasculares, Centro Cientifico Tecnologico-La Plata CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Argentina (A.M.)
| | - Evangelia G Kranias
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, OH (E.G.K.)
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11
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Rathod N, Guerrero-Serna G, Young HS, Espinoza-Fonseca LM. Replacement of Lys27 by asparagine in the SERCA regulator myoregulin: A Ca 2+ affinity modulator or a catalytic activity switch? Biochim Biophys Acta Mol Cell Res 2024; 1871:119613. [PMID: 37918638 DOI: 10.1016/j.bbamcr.2023.119613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 09/06/2023] [Accepted: 10/16/2023] [Indexed: 11/04/2023]
Abstract
Myoregulin (MLN) is a protein that regulates the activity of the sarcoplasmic reticulum Ca2+-ATPase (SERCA) without affecting its affinity for Ca2+. MLN's residue Lys27 is located at a site where other SERCA regulators control Ca2+ affinity. Therefore, we conducted atomistic simulations and ATPase activity experiments to determine whether replacing Lys27 with asparagine, a conserved residue found in various muscle SERCA regulators, would enable MLN to modulate both the Ca2+ affinity and catalytic activity of SERCA. Our findings indicate that replacing Lys27 with Asn significantly enhances the inhibitory potency of MLN, but it does not affect SERCA's affinity for Ca2+. We suggest that the SERCA site modulating Ca2+ affinity also acts as a catalytic activity switch. Therefore, this site is a key element contributing to the functional divergence among homologous SERCA regulators. This study paves the way for future investigations to explore how biological function diverges during the evolution of the SERCA regulator family.
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Affiliation(s)
- Nishadh Rathod
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - Guadalupe Guerrero-Serna
- Center for Arrhythmia Research, Department of Internal Medicine, Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, MI 48109, USA
| | - Howard S Young
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - L Michel Espinoza-Fonseca
- Center for Arrhythmia Research, Department of Internal Medicine, Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, MI 48109, USA.
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12
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Delrio-Lorenzo A, Rojo-Ruiz J, Torres-Vidal P, Alonso MT, García-Sancho J. In vitro and in vivo calibration of low affinity genetic Ca 2+ indicators. Cell Calcium 2024; 117:102819. [PMID: 37956535 DOI: 10.1016/j.ceca.2023.102819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 10/25/2023] [Accepted: 10/29/2023] [Indexed: 11/15/2023]
Abstract
Calcium is a universal intracellular messenger and proper Ca2+concentrations ([Ca2+]) both in the cytosol and in the lumen of cytoplasmic organelles are essential for cell functions. Ca2+ homeostasis is achieved by a delicate pump/leak balance both at the plasma membrane and at the endomembranes, and improper Ca2+ levels result in malfunction and disease. Selective intraorganellar Ca2+measurements are best achieved by using targeted genetically encoded Ca2+ indicators (GECIs) but to calibrate the luminal fluorescent signals into accurate [Ca2+] is challenging, especially in vivo, due to the difficulty to normalize and calibrate the fluorescent signal in various tissues or conditions. We report here a procedure to calibrate the ratiometric signal of GAP (GFP-Aequorin Protein) targeted to the endo-sarcoplasmic reticulum (ER/SR) into [Ca2+]ER/SR based on imaging of fluorescence after heating the tissue at 50-52 °C, since this value coincides with that obtained in the absence of Ca2+ (Rmin). Knowledge of the dynamic range (Rmax/Rmin) and the Ca2+-affinity (KD) of the indicator permits calculation of [Ca2+] by applying a simple algorithm. We have validated this procedure in vitro using several cell types (HeLa, HEK 293T and mouse astrocytes), as well as in vivo in Drosophila. Moreover, this methodology is applicable to other low Ca2+ affinity green and red GECIs.
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Affiliation(s)
- Alba Delrio-Lorenzo
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, Valladolid 47003, Spain
| | - Jonathan Rojo-Ruiz
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, Valladolid 47003, Spain
| | - Patricia Torres-Vidal
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, Valladolid 47003, Spain
| | - Maria Teresa Alonso
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, Valladolid 47003, Spain.
| | - Javier García-Sancho
- Unidad de Excelencia, Instituto de Biomedicina y Genética Molecular de Valladolid (IBGM), Universidad de Valladolid y Consejo Superior de Investigaciones Científicas (CSIC), c/ Sanz y Forés 3, Valladolid 47003, Spain
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13
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Kano R, Tabuchi A, Tanaka Y, Shirakawa H, Hoshino D, Poole DC, Kano Y. In vivo cytosolic H 2O 2 changes and Ca 2+ homeostasis in mouse skeletal muscle. Am J Physiol Regul Integr Comp Physiol 2024; 326:R43-R52. [PMID: 37899753 DOI: 10.1152/ajpregu.00152.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 09/21/2023] [Accepted: 10/20/2023] [Indexed: 10/31/2023]
Abstract
Hydrogen peroxide (H2O2) and calcium ions (Ca2+) are functional regulators of skeletal muscle contraction and metabolism. Although H2O2 is one of the activators of the type-1 ryanodine receptor (RyR1) in the Ca2+ release channel, the interdependence between H2O2 and Ca2+ dynamics remains unclear. This study tested the following hypotheses using an in vivo model of mouse tibialis anterior (TA) skeletal muscle. 1) Under resting conditions, elevated cytosolic H2O2 concentration ([H2O2]cyto) leads to a concentration-dependent increase in cytosolic Ca2+ concentration ([Ca2+]cyto) through its effect on RyR1; and 2) in hypoxia (cardiac arrest) and muscle contractions (electrical stimulation), increased [H2O2]cyto induces Ca2+ accumulation. Cytosolic H2O2 (HyPer7) and Ca2+ (Fura-2) dynamics were resolved by TA bioimaging in young C57BL/6J male mice under four conditions: 1) elevated exogenous H2O2; 2) cardiac arrest; 3) twitch (1 Hz, 60 s) contractions; and 4) tetanic (30 s) contractions. Exogenous H2O2 (0.1-100 mM) induced a concentration-dependent increase in [H2O2]cyto (+55% at 0.1 mM; +280% at 100 mM) and an increase in [Ca2+]cyto (+3% at 1.0 mM; +8% at 10 mM). This increase in [Ca2+]cyto was inhibited by pharmacological inhibition of RyR1 by dantrolene. Cardiac arrest-induced hypoxia increased [H2O2]cyto (+33%) and [Ca2+]cyto (+20%) 50 min postcardiac arrest. Compared with the exogenous 1.0 mM H2O2 condition, [H2O2]cyto after tetanic muscle contractions rose less than one-tenth as much, whereas [Ca2+]cyto was 4.7-fold higher. In conclusion, substantial increases in [H2O2]cyto levels evoke only modest Ca2+ accumulation via their effect on the sarcoplasmic reticulum RyR1. On the other hand, contrary to hypoxia secondary to cardiac arrest, increases in [H2O2]cyto from muscle contractions are small, indicating that H2O2 generation is unlikely to be a primary factor driving the significant Ca2+ accumulation after, especially tetanic, muscle contractions.NEW & NOTEWORTHY We developed an in vivo mouse myocyte H2O2 imaging model during exogenous H2O2 loading, ischemic hypoxia induced by cardiac arrest, and muscle contractions. In this study, the interrelationship between cytosolic H2O2 levels and Ca2+ homeostasis during muscle contraction and hypoxic conditions was revealed. These results contribute to the elucidation of the mechanisms of muscle fatigue and exercise adaptation.
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Affiliation(s)
- Ryotaro Kano
- Department of Engineering Science, Bioscience and Technology Program, University of Electro-Communications, Chofu, Japan
- Research Fellowship for Young Scientists, Japan Society for the Promotion of Science, Tokyo, Japan
| | - Ayaka Tabuchi
- Department of Engineering Science, Bioscience and Technology Program, University of Electro-Communications, Chofu, Japan
| | - Yoshinori Tanaka
- Department of Engineering Science, Bioscience and Technology Program, University of Electro-Communications, Chofu, Japan
| | - Hideki Shirakawa
- Department of Engineering Science, Bioscience and Technology Program, University of Electro-Communications, Chofu, Japan
| | - Daisuke Hoshino
- Department of Engineering Science, Bioscience and Technology Program, University of Electro-Communications, Chofu, Japan
- Center for Neuroscience and Biomedical Engineering, University of Electro-Communications, Chofu, Japan
| | - David C Poole
- Departments of Anatomy and Physiology and Kinesiology, Kansas State University, Manhattan, Kansas, United States
| | - Yutaka Kano
- Department of Engineering Science, Bioscience and Technology Program, University of Electro-Communications, Chofu, Japan
- Center for Neuroscience and Biomedical Engineering, University of Electro-Communications, Chofu, Japan
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14
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Cala SE, Carruthers NJ, Stemmer PM, Chen Z, Chen X. Activation of Ca 2+ transport in cardiac microsomes enriches functional sets of ER and SR proteins. Mol Cell Biochem 2024; 479:85-98. [PMID: 37036634 PMCID: PMC10786961 DOI: 10.1007/s11010-023-04708-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 03/12/2023] [Indexed: 04/11/2023]
Abstract
The importance of sarcoplasmic reticulum (SR) Ca2+-handling in heart has led to detailed understanding of Ca2+-release and re-uptake protein complexes, while less is known about other endoplasmic reticulum (ER) functions in the heart. To more fully understand cardiac SR and ER functions, we analyzed cardiac microsomes based on their increased density through the actions of the SR Ca2+-ATPase (SERCA) and the ryanodine receptor that are highly active in cardiomyocytes. Crude cardiac microsomal vesicles loaded with Ca oxalate produced two higher density subfractions, MedSR and HighSR. Proteins from 20.0 μg of MV, MedSR, and HighSR protein were fractionated using SDS-PAGE, then trypsinized from 20 separate gel pieces, and analyzed by LC-MS/MS to determine protein content. From 62,000 individual peptide spectra obtained, we identified 1105 different proteins, of which 354 were enriched ≥ 2.0-fold in SR fractions compared to the crude membrane preparation. Previously studied SR proteins were all enriched, as were proteins associated with canonical ER functions. Contractile, mitochondrial, and sarcolemmal proteins were not enriched. Comparing the levels of SERCA-positive SR proteins in MedSR versus HighSR vesicles produced a range of SR subfraction enrichments signifying differing levels of Ca2+ leak co-localized in the same membrane patch. All known junctional SR proteins were more enriched in MedSR, while canonical ER proteins were more enriched in HighSR membrane. Proteins constituting other putative ER/SR subdomains also exhibited average Esub enrichment values (mean ± S.D.) that spanned the range of possible Esub values, suggesting that functional sets of proteins are localized to the same areas of the ER/SR membrane. We conclude that active Ca2+ loading of cardiac microsomes, reflecting the combined activities of Ca2+ uptake by SERCA, and Ca2+ leak by RyR, permits evaluation of multiple functional ER/SR subdomains. Sets of proteins from these subdomains exhibited similar enrichment patterns across membrane subfractions, reflecting the relative levels of SERCA and RyR present within individual patches of cardiac ER and SR.
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Affiliation(s)
- Steven E Cala
- Department of Physiology, Wayne State University, Detroit, MI, 48201, USA.
| | | | - Paul M Stemmer
- Institute of Environmental Health Sciences, Wayne State University, Detroit, USA
| | - Zhenhui Chen
- Krannert Institute of Cardiology, Indiana University, Indianapolis, IN, USA
| | - Xuequn Chen
- Department of Physiology, Wayne State University, Detroit, MI, 48201, USA
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15
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Zemorshidi F, Töpf A, Claeys KG, McFarlane A, Patton A, Nafissi S, Straub V. Novel OBSCN variants associated with a risk to exercise-intolerance and rhabdomyolysis. Neuromuscul Disord 2024; 34:83-88. [PMID: 38159459 DOI: 10.1016/j.nmd.2023.10.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 10/16/2023] [Accepted: 10/23/2023] [Indexed: 01/03/2024]
Abstract
Obscurin, encoded by the OBSCN gene, is a muscle protein consisting of three main splice isoforms, obscurin-A, obscurin-B, and obscurin kinase-only protein (also known as KIAA1639 or Obsc-kin). Obscurin is located at the M-band and Z-disks and interacts with titin and myomesin. It plays an important role in the stability and maintenance of the A- and M-bands and the subsarcolemmal organization of the microtubule network. Furthermore, obscurin is involved in Ca2+ regulation and sarcoplasmic reticulum function and is connected to several other muscle proteins. OBSCN gene variants have been reported to be relatively common in inherited cardiomyopathies. Here we reported two young patients with a history of cramps, myalgia, exercise intolerance, rhabdomyolysis, and myoglobinuria without any evidence of concomitant cardiomyopathy in association with novel OBSCN variants (c.24822C>A and c.2653+1G>C). Obscurin-deficient muscle fibers seem to have increased susceptibility to damage triggered by exercise that may lead to rhabdomyolysis. More studies are needed to clarify the diverse clinical phenotypes and the pathophysiology of OBSCN gene variants.
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Affiliation(s)
- Fariba Zemorshidi
- Neuromuscular Research Center, Tehran University of Medical Sciences, Iran; Department of Neurology, Shariati Hospital,Tehran University of Medical Sciences, Tehran, Iran; Department of Neurology, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Ana Töpf
- John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - Kristl G Claeys
- Department of Neurology, University Hospitals Leuven, Leuven, Belgium; Laboratory for Muscle Diseases and Neuropathies, Department of Neurosciences, KU Leuven, and Leuven Brain Institute (LBI), Leuven, Belgium
| | - Adam McFarlane
- John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - Annabel Patton
- John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
| | - Shahriar Nafissi
- Neuromuscular Research Center, Tehran University of Medical Sciences, Iran; Department of Neurology, Shariati Hospital,Tehran University of Medical Sciences, Tehran, Iran.
| | - Volker Straub
- John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK.
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16
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MacDougall DJ, Hopkinson LD, King AN. The key to our hearts: Unlocking fundamental sex differences in mouse cardiomyocyte calcium-cycling. J Physiol 2024; 602:19-21. [PMID: 37997024 DOI: 10.1113/jp285735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 11/10/2023] [Indexed: 11/25/2023] Open
Affiliation(s)
- Daniel J MacDougall
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Lily D Hopkinson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Alexa N King
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
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17
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Egger C, Fernandez-Tenorio M, Blanch J, Janicek R, Egger M. Dual mode of action of IP 3-dependent SR-Ca 2+ release on local and global SR-Ca 2+ release in ventricular cardiomyocytes. J Mol Cell Cardiol 2024; 186:107-110. [PMID: 37993093 DOI: 10.1016/j.yjmcc.2023.11.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/23/2023] [Accepted: 11/17/2023] [Indexed: 11/24/2023]
Abstract
In heart muscle, the physiological function of IP3-induced Ca2+ release (IP3ICR) from the sarcoplasmic reticulum (SR) is still the subject of intense study. A role of IP3ICR may reside in modulating Ca2+-dependent cardiac arrhythmogenicity. Here we observe the propensity of spontaneous intracellular Ca2+ waves (SCaW) driven by Ca2+-induced Ca2+ release (CICR) in ventricular myocytes as a correlate of arrhythmogenicity on the organ level. We observe a dual mode of action of IP3ICR on SCaW generation in an IP3R overexpression model. This model shows a mild cardiac phenotype and mimics pathophysiological conditions of increased IP3R activity. In this model, IP3ICR was able to increase or decrease the occurrence of SCaW depending on global Ca2+ activity. This IP3ICR-based regulatory mechanism can operate in two "modes" depending on the intracellular CICR activity and efficiency (e.g. SCaW and/or local Ryanodine Receptor (RyR) Ca2+ release events, respectively): a) in a mode that augments the CICR mechanism at the cellular level, resulting in improved excitation-contraction coupling (ECC) and ultimately better contraction of the myocardium, and b) in a protective mode in which the CICR activity is curtailed to prevent the occurrence of Ca2+ waves at the cellular level and thus reduce the probability of arrhythmogenicity at the organ level.
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Affiliation(s)
- Caroline Egger
- Department of Physiology, University of Bern, Buehlplatz 5, CH 3012 Bern, Switzerland; Department of Emergency Medicine (Notfallzentrum) Inselspital - University of Bern, Freiburgstrasse 10, CH 3010 Bern, Switzerland
| | | | - Joaquim Blanch
- Department of Physiology, University of Bern, Buehlplatz 5, CH 3012 Bern, Switzerland
| | - Radoslav Janicek
- Department of Physiology, University of Bern, Buehlplatz 5, CH 3012 Bern, Switzerland
| | - Marcel Egger
- Department of Physiology, University of Bern, Buehlplatz 5, CH 3012 Bern, Switzerland.
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18
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Ishida R, Kurebayashi N, Iinuma H, Zeng X, Mori S, Kodama M, Murayama T, Masuno H, Takeda F, Kawahata M, Tanatani A, Miura A, Nishio H, Sakurai T, Kagechika H. A potent and selective cis-amide inhibitor of ryanodine receptor 2 as a candidate for cardiac arrhythmia treatment. Eur J Med Chem 2023; 262:115910. [PMID: 37922828 DOI: 10.1016/j.ejmech.2023.115910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/22/2023] [Accepted: 10/23/2023] [Indexed: 11/07/2023]
Abstract
Ryanodine receptor 2 (RyR2) is a Ca2+ release channel mainly located on the sarcoplasmic reticulum (SR) membrane of heart muscle cells and regulates the concentration of Ca2+ in the cytosol. RyR2 overactivation causes potentially lethal cardiac arrhythmias, but no specific inhibitor is yet available. Herein we developed the first highly potent and selective RyR2 inhibitor, TMDJ-035, containing 3,5-difluoro substituents on the A ring and a 4-fluoro substituent on the B ring, based on a comprehensive structure-activity relationship (SAR) study of tetrazole compound 1. The SAR study also showed that the amide conformation is critical for inhibitory potency. Single-crystal X-ray diffraction analysis and variable-temperature 1H NMR revealed that TMDJ-035 strongly favors cis-amide configuration, while the inactive analogue TMDJ-011 with a secondary amide takes trans-amide configuration. Examination of the selectivity among RyRs indicated that TMDJ-035 displayed high selectivity for RyR2. TMDJ-035 suppressed abnormal Ca2+ waves and transients in isolated cardiomyocytes from RyR2-mutated mice. It appears to be a promising candidate drug for treating cardiac arrhythmias due to RyR2 overactivation, as well as a tool for studying the mechanism and dynamics of RyR2 channel gating.
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Affiliation(s)
- Ryosuke Ishida
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, 101-0062, Japan
| | - Nagomi Kurebayashi
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan.
| | - Hiroto Iinuma
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, 101-0062, Japan
| | - Xi Zeng
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, 101-0062, Japan
| | - Shuichi Mori
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, 101-0062, Japan
| | - Masami Kodama
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Takashi Murayama
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Hiroyuki Masuno
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, 101-0062, Japan
| | - Fumi Takeda
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, 112-8610, Japan
| | - Masatoshi Kawahata
- Faculty of Pharmaceutical Sciences, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo, 194-8543, Japan
| | - Aya Tanatani
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, 112-8610, Japan
| | - Aya Miura
- Department of Legal Medicine, Hyogo Medical University, Nishinomiya, 663-8501, Japan
| | - Hajime Nishio
- Department of Legal Medicine, Hyogo Medical University, Nishinomiya, 663-8501, Japan
| | - Takashi Sakurai
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, 113-8421, Japan
| | - Hiroyuki Kagechika
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, 101-0062, Japan.
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19
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Mitronova GY, Quentin C, Belov VN, Wegener JW, Kiszka KA, Lehnart SE. 1,4-Benzothiazepines with Cyclopropanol Groups and Their Structural Analogues Exhibit Both RyR2-Stabilizing and SERCA2a-Stimulating Activities. J Med Chem 2023; 66:15761-15775. [PMID: 37991191 PMCID: PMC10726367 DOI: 10.1021/acs.jmedchem.3c01235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 10/24/2023] [Accepted: 11/07/2023] [Indexed: 11/23/2023]
Abstract
To discover new multifunctional agents for the treatment of cardiovascular diseases, we designed and synthesized a series of compounds with a cyclopropyl alcohol moiety and evaluated them in biochemical assays. Biological screening identified derivatives with dual activity: preventing Ca2+ leak through ryanodine receptor 2 (RyR2) and enhancing cardiac sarco-endoplasmic reticulum (SR) Ca2+ load by activation of Ca2+-dependent ATPase 2a (SERCA2a). The compounds that stabilize RyR2 at micro- and nanomolar concentrations are either structurally related to RyR-stabilizing drugs or Rycals or have structures similar to them. The novel compounds also demonstrate a good ability to increase ATP hydrolysis mediated by SERCA2a activity in cardiac microsomes, e.g., the half-maximal effective concentration (EC50) was as low as 383 nM for compound 12a, which is 1,4-benzothiazepine with two cyclopropanol groups. Our findings indicate that these derivatives can be considered as new lead compounds to improve cardiac function in heart failure.
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Affiliation(s)
- Gyuzel Y. Mitronova
- Department
of NanoBiophotonics, Max Planck Institute
for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
- German
Centre for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen 37075, Germany
| | - Christine Quentin
- Department
of NanoBiophotonics, Max Planck Institute
for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
| | - Vladimir N. Belov
- Department
of NanoBiophotonics, Max Planck Institute
for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
| | - Jörg W. Wegener
- Department
of Cardiology & Pulmonology, Heart Research Center Göttingen, University Medical Center Göttingen, Robert-Koch-Strasse 42a, Göttingen 37075, Germany
- German
Centre for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen 37075, Germany
| | - Kamila A. Kiszka
- Department
of NanoBiophotonics, Max Planck Institute
for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany
| | - Stephan E. Lehnart
- Department
of Cardiology & Pulmonology, Heart Research Center Göttingen, University Medical Center Göttingen, Robert-Koch-Strasse 42a, Göttingen 37075, Germany
- German
Centre for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen 37075, Germany
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20
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Bovo E, Rebbeck RT, Roopnarine O, Cornea RL, Thomas DD, Zima AV. Regulation of cardiac calcium signaling by newly identified calcium pump modulators. Biochem Biophys Res Commun 2023; 685:149136. [PMID: 37907012 PMCID: PMC10841636 DOI: 10.1016/j.bbrc.2023.149136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 10/09/2023] [Accepted: 10/18/2023] [Indexed: 11/02/2023]
Abstract
In cardiomyocytes, the sarco/endoplasmic reticulum Ca2+-ATPase (SERCA2a) is a central component of intracellular Ca2+ regulation. Several heart diseases, including heart failure, are associated with reduced myocardial contraction due to SERCA2a downregulation. Therefore, the need for developing new drugs that could improve SERCA2a function is high. We have recently identified SERCA2a modulators (Compounds 6 and 8) from our screening campaigns and confirmed activation of biochemical SERCA2a ATPase activity and Ca2+ uptake activity. In this study, confocal microscopy and in-cell Ca2+ imaging were used to characterize the effects of these SERCA2a activators on Ca2+ regulation in mouse ventricular myocytes and endoplasmic reticulum (ER) Ca2+ uptake in a HEK293 cell expressing human SERCA2a. Analysis of cytosolic Ca2+ dynamics in cardiomyocytes revealed that both Compounds (6 and 8) increase the action potential-induced Ca2+ transients and sarcoplasmic reticulum (SR) Ca2+ load. While Compound 6 induced a negligible effect on Ca2+ transients invoked by the L-type Ca2+ channel (LTCC) current, Compound 8 increased Ca2+ transients during LTCC activation, suggesting an off-target protein interaction of Compound 8. Analysis of ER Ca2+ transport by human SERCA2a in HEK cells showed that only Compound 6 increased both ER Ca2+ uptake and ER Ca2+ load significantly, whereas Compound 8 had no effect on SERCA2a Ca2+ transport. This study revealed that Compound 6 exhibits promising characteristics that can improve intracellular Ca2+ dynamics by selectively enhancing SERCA2a Ca2+ uptake.
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Affiliation(s)
- Elisa Bovo
- Department of Cell and Molecular Physiology, Loyola University Chicago, Maywood, IL, 60153, USA
| | - Robyn T Rebbeck
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Osha Roopnarine
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Razvan L Cornea
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA
| | - David D Thomas
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Aleksey V Zima
- Department of Cell and Molecular Physiology, Loyola University Chicago, Maywood, IL, 60153, USA.
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21
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Stege NM, Eijgenraam TR, Oliveira Nunes Teixeira V, Feringa AM, Schouten EM, Kuster DW, van der Velden J, Wolters AH, Giepmans BN, Makarewich CA, Bassel-Duby R, Olson EN, de Boer RA, Silljé HH. DWORF Extends Life Span in a PLN-R14del Cardiomyopathy Mouse Model by Reducing Abnormal Sarcoplasmic Reticulum Clusters. Circ Res 2023; 133:1006-1021. [PMID: 37955153 PMCID: PMC10699510 DOI: 10.1161/circresaha.123.323304] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/18/2023] [Accepted: 11/01/2023] [Indexed: 11/14/2023]
Abstract
BACKGROUND The p.Arg14del variant of the PLN (phospholamban) gene causes cardiomyopathy, leading to severe heart failure. Calcium handling defects and perinuclear PLN aggregation have both been suggested as pathological drivers of this disease. Dwarf open reading frame (DWORF) has been shown to counteract PLN regulatory calcium handling function in the sarco/endoplasmic reticulum (S/ER). Here, we investigated the potential disease-modulating action of DWORF in this cardiomyopathy and its effects on calcium handling and PLN aggregation. METHODS We studied a PLN-R14del mouse model, which develops cardiomyopathy with similar characteristics as human patients, and explored whether cardiac DWORF overexpression could delay cardiac deterioration. To this end, R14Δ/Δ (homozygous PLN-R14del) mice carrying the DWORF transgene (R14Δ/ΔDWORFTg [R14Δ/Δ mice carrying the DWORF transgene]) were used. RESULTS DWORF expression was suppressed in hearts of R14Δ/Δ mice with severe heart failure. Restoration of DWORF expression in R14Δ/Δ mice delayed cardiac fibrosis and heart failure and increased life span >2-fold (from 8 to 18 weeks). DWORF accelerated sarcoplasmic reticulum calcium reuptake and relaxation in isolated cardiomyocytes with wild-type PLN, but in R14Δ/Δ cardiomyocytes, sarcoplasmic reticulum calcium reuptake and relaxation were already enhanced, and no differences were detected between R14Δ/Δ and R14Δ/ΔDWORFTg. Rather, DWORF overexpression delayed the appearance and formation of large pathogenic perinuclear PLN clusters. Careful examination revealed colocalization of sarcoplasmic reticulum markers with these PLN clusters in both R14Δ/Δ mice and human p.Arg14del PLN heart tissue, and hence these previously termed aggregates are comprised of abnormal organized S/ER. This abnormal S/ER organization in PLN-R14del cardiomyopathy contributes to cardiomyocyte cell loss and replacement fibrosis, consequently resulting in cardiac dysfunction. CONCLUSIONS Disorganized S/ER is a major characteristic of PLN-R14del cardiomyopathy in humans and mice and results in cardiomyocyte death. DWORF overexpression delayed PLN-R14del cardiomyopathy progression and extended life span in R14Δ/Δ mice, by reducing abnormal S/ER clusters.
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Affiliation(s)
- Nienke M. Stege
- Department of Cardiology, University Medical Center Groningen, University of Groningen, the Netherlands (N.M.S., T.R.E., V.O.N.T., A.M.F., E.M.S., R.A.d.B., H.H.W.S.)
| | - Tim R. Eijgenraam
- Department of Cardiology, University Medical Center Groningen, University of Groningen, the Netherlands (N.M.S., T.R.E., V.O.N.T., A.M.F., E.M.S., R.A.d.B., H.H.W.S.)
| | - Vivian Oliveira Nunes Teixeira
- Department of Cardiology, University Medical Center Groningen, University of Groningen, the Netherlands (N.M.S., T.R.E., V.O.N.T., A.M.F., E.M.S., R.A.d.B., H.H.W.S.)
| | - Anna M. Feringa
- Department of Cardiology, University Medical Center Groningen, University of Groningen, the Netherlands (N.M.S., T.R.E., V.O.N.T., A.M.F., E.M.S., R.A.d.B., H.H.W.S.)
| | - Elisabeth M. Schouten
- Department of Cardiology, University Medical Center Groningen, University of Groningen, the Netherlands (N.M.S., T.R.E., V.O.N.T., A.M.F., E.M.S., R.A.d.B., H.H.W.S.)
| | - Diederik W.D. Kuster
- Department of Physiology (D.W.D.K., J.v.d.V.), Amsterdam UMC, Vrije Universiteit Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias (D.W.D.K., J.v.d.V.), Amsterdam UMC, Vrije Universiteit Amsterdam, the Netherlands
| | - Jolanda van der Velden
- Department of Physiology (D.W.D.K., J.v.d.V.), Amsterdam UMC, Vrije Universiteit Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias (D.W.D.K., J.v.d.V.), Amsterdam UMC, Vrije Universiteit Amsterdam, the Netherlands
| | - Anouk H.G. Wolters
- Biomedical Sciences of Cells and Systems, UMC Groningen, University of Groningen, the Netherlands (A.H.G.W., B.N.G.G.)
| | - Ben N.G. Giepmans
- Biomedical Sciences of Cells and Systems, UMC Groningen, University of Groningen, the Netherlands (A.H.G.W., B.N.G.G.)
| | - Catherine A. Makarewich
- Division of Molecular Cardiovascular Biology of the Heart Institute, Cincinnati Children’s Hospital Medical Center, OH (C.A.M.)
- Department of Pediatrics, University of Cincinnati College of Medicine, OH (C.A.M.)
| | - Rhonda Bassel-Duby
- Department of Cardiology, University Medical Center Groningen, University of Groningen, the Netherlands (N.M.S., T.R.E., V.O.N.T., A.M.F., E.M.S., R.A.d.B., H.H.W.S.)
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas (R.B.-D., E.N.O.)
| | - Eric N. Olson
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas (R.B.-D., E.N.O.)
| | - Rudolf A. de Boer
- Department of Cardiology, Erasmus University Medical Center, Rotterdam, the Netherlands (R.A.d.B.)
| | - Herman H.W. Silljé
- Department of Cardiology, University Medical Center Groningen, University of Groningen, the Netherlands (N.M.S., T.R.E., V.O.N.T., A.M.F., E.M.S., R.A.d.B., H.H.W.S.)
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22
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Power AS, Asamudo EU, Worthington LP, Alim CC, Parackal RE, Wallace RS, Ebenebe OV, Heller Brown J, Kohr MJ, Bers DM, Erickson JR. Nitric Oxide Modulates Ca 2+ Leak and Arrhythmias via S-Nitrosylation of CaMKII. Circ Res 2023; 133:1040-1055. [PMID: 37961889 PMCID: PMC10699507 DOI: 10.1161/circresaha.123.323571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 10/29/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023]
Abstract
BACKGROUND Nitric oxide (NO) has been identified as a signaling molecule generated during β-adrenergic receptor stimulation in the heart. Furthermore, a role for NO in triggering spontaneous Ca2+ release via S-nitrosylation of CaMKIIδ (Ca2+/calmodulin kinase II delta) is emerging. NO donors are routinely used clinically for their cardioprotective effects on the heart, but it is unknown how NO donors modulate the proarrhythmic CaMKII to alter cardiac arrhythmia incidence. We test the role of S-nitrosylation of CaMKIIδ at the Cysteine-273 inhibitory site and cysteine-290 activating site in cardiac Ca2+ handling and arrhythmogenesis before and during β-adrenergic receptor stimulation. METHODS We measured Ca2+-handling in isolated cardiomyocytes from C57BL/6J wild-type (WT) mice and mice lacking CaMKIIδ expression (CaMKIIδ-KO) or with deletion of the S-nitrosylation site on CaMKIIδ at cysteine-273 or cysteine-290 (CaMKIIδ-C273S and -C290A knock-in mice). Cardiomyocytes were exposed to NO donors, S-nitrosoglutathione (GSNO; 150 μM), sodium nitroprusside (200 μM), and β-adrenergic agonist isoproterenol (100 nmol/L). RESULTS Both WT and CaMKIIδ-KO cardiomyocytes responded to isoproterenol with a full inotropic and lusitropic Ca2+ transient response as well as increased Ca2+ spark frequency. However, the increase in Ca2+ spark frequency was significantly attenuated in CaMKIIδ-KO cardiomyocytes. The protection from isoproterenol-induced Ca2+ sparks and waves was mimicked by GSNO pretreatment in WT cardiomyocytes but lost in CaMKIIδ-C273S cardiomyocytes. When GSNO was applied after isoproterenol, this protection was not observed in WT or CaMKIIδ-C273S but was apparent in CaMKIIδ-C290A. In Langendorff-perfused isolated hearts, GSNO pretreatment limited isoproterenol-induced arrhythmias in WT but not CaMKIIδ-C273S hearts, while GSNO exposure after isoproterenol sustained or exacerbated arrhythmic events. CONCLUSIONS We conclude that prior S-nitrosylation of CaMKIIδ at cysteine-273 can limit subsequent β-adrenergic receptor-induced arrhythmias, but that S-nitrosylation at cysteine-290 might worsen or sustain β-adrenergic receptor-induced arrhythmias. This has important implications for the administration of NO donors in the clinical setting.
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Affiliation(s)
- Amelia S. Power
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
- Department of Physiology, University of Auckland, New Zealand (A.S.P.)
| | - Esther U. Asamudo
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
- Department of Pharmacology, University of California, Davis (E.U.A., C.C.A., D.M.B.)
| | - Luke P.I. Worthington
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
| | - Chidera C. Alim
- Department of Pharmacology, University of California, Davis (E.U.A., C.C.A., D.M.B.)
| | - Raquel E. Parackal
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
| | - Rachel S. Wallace
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
| | - Obialunanma V. Ebenebe
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (O.V.E., M.J.K.)
| | - Joan Heller Brown
- Department of Pharmacology, University of California, San Diego, La Jolla (J.H.B.)
| | - Mark J. Kohr
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (O.V.E., M.J.K.)
| | - Donald M. Bers
- Department of Pharmacology, University of California, Davis (E.U.A., C.C.A., D.M.B.)
| | - Jeffrey R. Erickson
- Department of Physiology and HeartOtago, University of Otago, Dunedin, New Zealand (A.S.P., E.U.A., L.P.I.W., R.E.P., R.S.W., J.R.E.)
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23
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Chakraborty P, Aggarwal AK, Nair MKK, Massé S, Riazi S, Nanthakumar K. Restoration of calcium release synchrony: A novel target for heart failure and ventricular arrhythmia. Heart Rhythm 2023; 20:1773-1781. [PMID: 37678492 DOI: 10.1016/j.hrthm.2023.08.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 08/13/2023] [Accepted: 08/31/2023] [Indexed: 09/09/2023]
Abstract
Myocardial calcium (Ca2+) signaling plays a crucial role in contractile function and membrane electrophysiology. An abnormal myocardial Ca2+ transient is linked to heart failure and ventricular arrhythmias. At the subcellular level, the synchronous release of Ca2+ sparks from sarcoplasmic Ca2+ release units determines the configuration and amplitude of the global Ca2+ transient. This narrative review evaluates the role of aberrant Ca2+ release synchrony in the pathophysiology of cardiomyopathies and ventricular arrhythmias. The potential therapeutic benefits of restoration of Ca2+ release synchrony in heart failure and ventricular arrhythmias are also discussed.
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Affiliation(s)
- Praloy Chakraborty
- The Hull Family Cardiac Fibrillation Management Laboratory, Toronto General Hospital, University Health Network, Toronto, Ontario, Canada; Heart Rhythm Institute, University of Oklahoma Health Science Center, Oklahoma City, Oklahoma
| | - Arjun K Aggarwal
- The Hull Family Cardiac Fibrillation Management Laboratory, Toronto General Hospital, University Health Network, Toronto, Ontario, Canada
| | - Madhav Krishna Kumar Nair
- The Hull Family Cardiac Fibrillation Management Laboratory, Toronto General Hospital, University Health Network, Toronto, Ontario, Canada
| | - Stéphane Massé
- The Hull Family Cardiac Fibrillation Management Laboratory, Toronto General Hospital, University Health Network, Toronto, Ontario, Canada
| | - Sheila Riazi
- Malignant Hyperthermia Investigation Unit, Department of Anesthesia and Pain Management, University Health Network, Toronto, Ontario, Canada
| | - Kumaraswamy Nanthakumar
- The Hull Family Cardiac Fibrillation Management Laboratory, Toronto General Hospital, University Health Network, Toronto, Ontario, Canada.
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24
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Waddell HMM, Mereacre V, Alvarado FJ, Munro ML. Clustering properties of the cardiac ryanodine receptor in health and heart failure. J Mol Cell Cardiol 2023; 185:38-49. [PMID: 37890552 DOI: 10.1016/j.yjmcc.2023.10.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 10/09/2023] [Accepted: 10/24/2023] [Indexed: 10/29/2023]
Abstract
The cardiac ryanodine receptor (RyR2) is an intracellular Ca2+ release channel vital for the function of the heart. Physiologically, RyR2 is triggered to release Ca2+ from the sarcoplasmic reticulum (SR) which enables cardiac contraction; however, spontaneous Ca2+ leak from RyR2 has been implicated in the pathophysiology of heart failure (HF). RyR2 channels have been well documented to assemble into clusters within the SR membrane, with the organisation of RyR2 clusters recently gaining interest as a mechanism by which the occurrence of pathological Ca2+ leak is regulated, including in HF. In this review, we explain the terminology relating to key nanoscale RyR2 clustering properties as both single clusters and functionally grouped Ca2+ release units, with a focus on the advancements in super-resolution imaging approaches which have enabled the detailed study of cluster organisation. Further, we discuss proposed mechanisms for modulating RyR2 channel organisation and the debate regarding the potential impact of cluster organisation on Ca2+ leak activity. Finally, recent experimental evidence investigating the nanoscale remodelling and functional alterations of RyR2 clusters in HF is discussed with consideration of the clinical implications.
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Affiliation(s)
- Helen M M Waddell
- Department of Physiology and HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Valeria Mereacre
- Department of Physiology and HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Francisco J Alvarado
- Department of Medicine and Cardiovascular Research Center, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA
| | - Michelle L Munro
- Department of Physiology and HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand.
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25
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Bibollet H, Kramer A, Bannister RA, Hernández-Ochoa EO. Advances in Ca V1.1 gating: New insights into permeation and voltage-sensing mechanisms. Channels (Austin) 2023; 17:2167569. [PMID: 36642864 PMCID: PMC9851209 DOI: 10.1080/19336950.2023.2167569] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 01/09/2023] [Indexed: 01/17/2023] Open
Abstract
The CaV1.1 voltage-gated Ca2+ channel carries L-type Ca2+ current and is the voltage-sensor for excitation-contraction (EC) coupling in skeletal muscle. Significant breakthroughs in the EC coupling field have often been close on the heels of technological advancement. In particular, CaV1.1 was the first voltage-gated Ca2+ channel to be cloned, the first ion channel to have its gating current measured and the first ion channel to have an effectively null animal model. Though these innovations have provided invaluable information regarding how CaV1.1 detects changes in membrane potential and transmits intra- and inter-molecular signals which cause opening of the channel pore and support Ca2+ release from the sarcoplasmic reticulum remain elusive. Here, we review current perspectives on this topic including the recent application of functional site-directed fluorometry.
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Affiliation(s)
- Hugo Bibollet
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Audra Kramer
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Roger A. Bannister
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
- Department of Pathology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Erick O. Hernández-Ochoa
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
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26
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Marabelli C, Santiago DJ, Priori SG. The Structural-Functional Crosstalk of the Calsequestrin System: Insights and Pathological Implications. Biomolecules 2023; 13:1693. [PMID: 38136565 PMCID: PMC10741413 DOI: 10.3390/biom13121693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/14/2023] [Accepted: 11/21/2023] [Indexed: 12/24/2023] Open
Abstract
Calsequestrin (CASQ) is a key intra-sarcoplasmic reticulum Ca2+-handling protein that plays a pivotal role in the contraction of cardiac and skeletal muscles. Its Ca2+-dependent polymerization dynamics shape the translation of electric excitation signals to the Ca2+-induced contraction of the actin-myosin architecture. Mutations in CASQ are linked to life-threatening pathological conditions, including tubular aggregate myopathy, malignant hyperthermia, and Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT). The variability in the penetrance of these phenotypes and the lack of a clear understanding of the disease mechanisms associated with CASQ mutations pose a major challenge to the development of effective therapeutic strategies. In vitro studies have mainly focused on the polymerization and Ca2+-buffering properties of CASQ but have provided little insight into the complex interplay of structural and functional changes that underlie disease. In this review, the biochemical and structural natures of CASQ are explored in-depth, while emphasizing their direct and indirect consequences for muscle Ca2+ physiology. We propose a novel functional classification of CASQ pathological missense mutations based on the structural stability of the monomer, dimer, or linear polymer conformation. We also highlight emerging similarities between polymeric CASQ and polyelectrolyte systems, emphasizing the potential for the use of this paradigm to guide further research.
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Affiliation(s)
- Chiara Marabelli
- Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy;
- Laboratory of Molecular Cardiology, IRCCS ICS Maugeri, 27100 Pavia, Italy
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 28029 Madrid, Spain;
| | - Demetrio J. Santiago
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 28029 Madrid, Spain;
| | - Silvia G. Priori
- Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy;
- Laboratory of Molecular Cardiology, IRCCS ICS Maugeri, 27100 Pavia, Italy
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 28029 Madrid, Spain;
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27
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Ávila G. Fluorofenidone enhances cardiac contractility by stimulating CICR and Ca V1.2. Biochem Biophys Res Commun 2023; 681:242-248. [PMID: 37788591 DOI: 10.1016/j.bbrc.2023.09.079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 09/25/2023] [Indexed: 10/05/2023]
Abstract
Fluorofenidone (AKF-PD) is a novel pyridone derivative that inhibits fibrosis and inflammation in many tissues. Accordingly, it has been effective in disease models, such as liver failure, nephropathy, and pulmonary fibrosis. However, its potential role in cardiac physiology and pathology has yet to be elucidated. Thus, this paper investigated a possible functional impact of AKF-PD on adult rat cardiac myocytes. Cells were kept in culture for 1-2 days under either control conditions or the presence of AKF-PD (500 μM). They were next examined concerning cell contractility, intracellular Ca2+ homeostasis, and activity of voltage-gated Ca2+ channels. Remarkably, AKF-PD enhanced the percentage of cell shortening and rates of both contraction and relaxation by nearly 100%. A stimulus in Ca2+-induced Ca2+ release (CICR) most likely accounts for these effects because AKF-PD also increased the magnitude of electrically evoked Ca2+ transients. Of note, the compound did not alter the peak value of caffeine-elicited Ca2+ transients, indicating stimulation of CICR at constant sarcoplasmic reticulum Ca2+ load. Since CICR is triggered by the entry of Ca2+ through CaV1.2 (ICa), a possible effect on these Ca2+ channels was also investigated. AKF-PD increased the magnitude of both ICa and maximal macroscopic Ca2+ conductance (Gmax) by about 50%. However, no differences were found in either voltage dependence of inactivation or the amount of maximal immobilization-resistant charge movement (Qmax). Thus, the effect on ICa could be explained by a higher channel's open probability (Po) rather than a greater abundance of channel proteins. Additional data indicate that AKF-PD reduces the rate of Ca2+ extrusion in the presence of caffeine, suggesting inhibition of the Na/Ca exchanger. Overall, these results indicate that AKF-PD upregulates the Po of CaV1.2 and then sequentially enhances ICa, CICR, and contractility. Therefore, the novel compound is also a candidate to be tested in cardiac disease models.
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Affiliation(s)
- Guillermo Ávila
- Departamento de Bioquímica, Cinvestav-IPN, AP 14-740, México City, 07000, México.
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28
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Lee TI, Trang NN, Lee TW, Higa S, Kao YH, Chen YC, Chen YJ. Ketogenic Diet Regulates Cardiac Remodeling and Calcium Homeostasis in Diabetic Rat Cardiomyopathy. Int J Mol Sci 2023; 24:16142. [PMID: 38003332 PMCID: PMC10671812 DOI: 10.3390/ijms242216142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/02/2023] [Accepted: 11/06/2023] [Indexed: 11/26/2023] Open
Abstract
A ketogenic diet (KD) might alleviate patients with diabetic cardiomyopathy. However, the underlying mechanism remains unclear. Myocardial function and arrhythmogenesis are closely linked to calcium (Ca2+) homeostasis. We investigated the effects of a KD on Ca2+ homeostasis and electrophysiology in diabetic cardiomyopathy. Male Wistar rats were created to have diabetes mellitus (DM) using streptozotocin (65 mg/kg, intraperitoneally), and subsequently treated for 6 weeks with either a normal diet (ND) or a KD. Our electrophysiological and Western blot analyses assessed myocardial Ca2+ homeostasis in ventricular preparations in vivo. Unlike those on the KD, DM rats treated with an ND exhibited a prolonged QTc interval and action potential duration. Compared to the control and DM rats on the KD, DM rats treated with an ND also showed lower intracellular Ca2+ transients, sarcoplasmic reticular Ca2+ content, sodium (Na+)-Ca2+ exchanger currents (reverse mode), L-type Ca2+ contents, sarcoplasmic reticulum ATPase contents, Cav1.2 contents. Furthermore, these rats exhibited elevated ratios of phosphorylated to total proteins across multiple Ca2+ handling proteins, including ryanodine receptor 2 (RyR2) at serine 2808, phospholamban (PLB)-Ser16, and calmodulin-dependent protein kinase II (CaMKII). Additionally, DM rats treated with an ND demonstrated a higher frequency and incidence of Ca2+ leak, cytosolic reactive oxygen species, Na+/hydrogen-exchanger currents, and late Na+ currents than the control and DM rats on the KD. KD treatment may attenuate the effects of DM-dysregulated Na+ and Ca2+ homeostasis, contributing to its cardioprotection in DM.
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Affiliation(s)
- Ting-I Lee
- Division of Endocrinology and Metabolism, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan; (T.-I.L.); (T.-W.L.)
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei 11696, Taiwan
| | | | - Ting-Wei Lee
- Division of Endocrinology and Metabolism, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan; (T.-I.L.); (T.-W.L.)
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei 11696, Taiwan
| | - Satoshi Higa
- Cardiac Electrophysiology and Pacing Laboratory, Division of Cardiovascular Medicine, Makiminato Central Hospital, Makiminato Urasoe City, Okinawa 901-2131, Japan;
| | - Yu-Hsun Kao
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan;
- Department of Medical Education and Research, Wan Fang Hospital, Taipei Medical University, Taipei 11696, Taiwan
| | - Yao-Chang Chen
- Department of Biomedical Engineering, National Defense Medical Center, Taipei 11490, Taiwan
| | - Yi-Jen Chen
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan;
- Cardiovascular Research Center, Wan Fang Hospital, Taipei Medical University, Taipei 11696, Taiwan
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29
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Aitken‐Buck HM, Khaing EP, Lamberts RR, Jones PP. Study of amphipathic metabolites in cardiac pathophysiology: Insights gained from long-chain acylcarnitines and calcium handling. J Cell Mol Med 2023; 27:3641-3645. [PMID: 37688368 PMCID: PMC10660640 DOI: 10.1111/jcmm.17949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 08/16/2023] [Accepted: 08/30/2023] [Indexed: 09/10/2023] Open
Affiliation(s)
- Hamish M. Aitken‐Buck
- Department of Physiology, HeartOtago, School of Biomedical SciencesUniversity of OtagoDunedinNew Zealand
| | - Ei Phyo Khaing
- Department of Physiology, HeartOtago, School of Biomedical SciencesUniversity of OtagoDunedinNew Zealand
| | - Regis R. Lamberts
- Department of Physiology, HeartOtago, School of Biomedical SciencesUniversity of OtagoDunedinNew Zealand
| | - Peter P. Jones
- Department of Physiology, HeartOtago, School of Biomedical SciencesUniversity of OtagoDunedinNew Zealand
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30
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Brini M, Calì T. SERCA2 phosphorylation at the heart of the disease. Cell Calcium 2023; 115:102784. [PMID: 37572431 DOI: 10.1016/j.ceca.2023.102784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 07/28/2023] [Indexed: 08/14/2023]
Abstract
Gonnot et al. [1] thoroughly investigated the regulatory role of glycogen synthase kinase 3 beta (GSK3β) in modulating cardiac isoform 2 of sarcoplasmic/endoplasmic reticulum Ca2+ ATPase (SERCA2) activity. They have found that in ischemic hearts of patients and mouse-GSK3β -mediated SERCA2 phosphorylation at serine 663 dampens the SERCA2 pump activity and induces Ca2+ overload which sensitizes towards myocardial ischemia-reperfusion (I/R) injury. The inhibition of serine 663 phosphorylation significantly increases SERCA2 activity and, by preventing cytosolic and mitochondrial Ca2+ overload, reduces cell death during reperfusion. Augmented SERCA2 activity also substantially improves excitation-contraction coupling in cardiomyocytes upon recovery from reperfusion injury. This study provides valuable insights into pathophysiological relevance of GSK3β -mediated SERCA2 phosphorylation in the context of heart diseases and paves the way for designing novel clinical therapeutic approaches to alleviate post infartion heart failure.
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Affiliation(s)
- Marisa Brini
- Department of Biology (DIBIO), University of Padova, Italy; Department of Pharmaceutical and Pharmacological Sciences (DSF), University of Padova, Italy; Study Center for Neurodegeneration (CESNE), University of Padova, Italy.
| | - Tito Calì
- Study Center for Neurodegeneration (CESNE), University of Padova, Italy; Department of Biomedical Sciences (DSB), University of Padova, Italy; Padova Neuroscience Center (PNC), University of Padova, Padova, Italy.
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31
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Toth N, Zhang XH, Zamaro A, Morad M. Calcium Signaling Consequences of RyR2-S4938F Mutation Expressed in Human iPSC-Derived Cardiomyocytes. Int J Mol Sci 2023; 24:15307. [PMID: 37894987 PMCID: PMC10607246 DOI: 10.3390/ijms242015307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/02/2023] [Accepted: 10/14/2023] [Indexed: 10/29/2023] Open
Abstract
Type-2 ryanodine receptor (RyR2) is the major Ca2+ release channel of the cardiac sarcoplasmic reticulum (SR) that controls the rhythm and strength of the heartbeat, but its malfunction may generate severe arrhythmia leading to sudden cardiac death or heart failure. S4938F-RyR2 mutation in the carboxyl-terminal was expressed in human induced pluripotent stem cells derived cardiomyocytes (hiPSC-CMs) using CRISPR/Cas9 gene-editing technique. Ca2+ signaling and electrophysiological properties of beating cardiomyocytes carrying the mutation were studied using total internal reflection fluorescence microscopy (TIRF) and patch clamp technique. In mutant cells, L-type Ca2+ currents (ICa), measured either by depolarizations to zero mV or repolarizations from +100 mV to -50 mV, and their activated Ca2+ transients were significantly smaller, despite their larger caffeine-triggered Ca2+ release signals compared to wild type (WT) cells, suggesting ICa-induced Ca2+ release (CICR) was compromised. The larger SR Ca2+ content of S4938F-RyR2 cells may underlie the higher frequency of spontaneously occurring Ca2+ sparks and Ca2+ transients and their arrhythmogenic phenotype.
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Affiliation(s)
- Noemi Toth
- Cardiac Signaling Center, University of South Carolina, Medical University of South Carolina and Clemson University, Charleston, SC 29425, USA; (N.T.); (X.-H.Z.)
| | - Xiao-Hua Zhang
- Cardiac Signaling Center, University of South Carolina, Medical University of South Carolina and Clemson University, Charleston, SC 29425, USA; (N.T.); (X.-H.Z.)
| | - Alexandra Zamaro
- Cardiac Signaling Center, University of South Carolina, Medical University of South Carolina and Clemson University, Charleston, SC 29425, USA; (N.T.); (X.-H.Z.)
| | - Martin Morad
- Cardiac Signaling Center, University of South Carolina, Medical University of South Carolina and Clemson University, Charleston, SC 29425, USA; (N.T.); (X.-H.Z.)
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
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32
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Okolo CA, Khaing EP, Mereacre V, Wallace RS, Munro ML, Erickson JR, Jones PP. Direct regulation of the cardiac ryanodine receptor (RyR2) by O-GlcNAcylation. Cardiovasc Diabetol 2023; 22:276. [PMID: 37833717 PMCID: PMC10576323 DOI: 10.1186/s12933-023-02010-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Accepted: 09/27/2023] [Indexed: 10/15/2023] Open
Abstract
BACKGROUND O-GlcNAcylation is the enzymatic addition of a sugar, O-linked β-N-Acetylglucosamine, to the serine and threonine residues of proteins, and is abundant in diabetic conditions. We have previously shown that O-GlcNAcylation can trigger arrhythmias by indirectly increasing pathological Ca2+ leak through the cardiac ryanodine receptor (RyR2) via Ca2+/calmodulin-dependent kinase II (CaMKII). However, RyR2 is well known to be directly regulated by other forms of serine and threonine modification, therefore, this study aimed to determine whether RyR2 is directly modified by O-GlcNAcylation and if this also alters the function of RyR2 and Ca2+ leak. METHODS O-GlcNAcylation of RyR2 in diabetic human and animal hearts was determined using western blotting. O-GlcNAcylation of RyR2 was pharmacologically controlled and the propensity for Ca2+ leak was determined using single cell imaging. The site of O-GlcNAcylation within RyR2 was determined using site-directed mutagenesis of RyR2. RESULTS We found that RyR2 is modified by O-GlcNAcylation in human, animal and HEK293 cell models. Under hyperglycaemic conditions O-GlcNAcylation was associated with an increase in Ca2+ leak through RyR2 which persisted after CaMKII inhibition. Conversion of serine-2808 to alanine prevented an O-GlcNAcylation induced increase in Ca2+ leak. CONCLUSIONS These data suggest that the function of RyR2 can be directly regulated by O-GlcNAcylation and requires the presence of serine-2808.
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Affiliation(s)
- Chidinma A Okolo
- Department of Physiology, School of Biomedical Sciences, Division of Health Sciences, and HeartOtago, University of Otago, Dunedin, Otago, New Zealand
- Beamline B24, Life Sciences Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, England, United Kingdom
| | - Ei-Phyo Khaing
- Department of Physiology, School of Biomedical Sciences, Division of Health Sciences, and HeartOtago, University of Otago, Dunedin, Otago, New Zealand
| | - Valeria Mereacre
- Department of Physiology, School of Biomedical Sciences, Division of Health Sciences, and HeartOtago, University of Otago, Dunedin, Otago, New Zealand
| | - Rachel S Wallace
- Department of Physiology, School of Biomedical Sciences, Division of Health Sciences, and HeartOtago, University of Otago, Dunedin, Otago, New Zealand
| | - Michelle L Munro
- Department of Physiology, School of Biomedical Sciences, Division of Health Sciences, and HeartOtago, University of Otago, Dunedin, Otago, New Zealand
| | - Jeffrey R Erickson
- Department of Physiology, School of Biomedical Sciences, Division of Health Sciences, and HeartOtago, University of Otago, Dunedin, Otago, New Zealand
| | - Peter P Jones
- Department of Physiology, School of Biomedical Sciences, Division of Health Sciences, and HeartOtago, University of Otago, Dunedin, Otago, New Zealand.
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Pearce L, Meizoso-Huesca A, Seng C, Lamboley CR, Singh DP, Launikonis BS. Ryanodine receptor activity and store-operated Ca 2+ entry: Critical regulators of Ca 2+ content and function in skeletal muscle. J Physiol 2023; 601:4183-4202. [PMID: 35218018 DOI: 10.1113/jp279512] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 01/28/2022] [Indexed: 11/08/2022] Open
Abstract
Store-operated Ca2+ entry (SOCE) is critical to cell function. In skeletal muscle, SOCE has evolved alongside excitation-contraction coupling (EC coupling); as a result, it displays unique properties compared to SOCE in other cells. The plasma membrane of skeletal muscle is mostly internalized as the tubular system, with the tubules meeting the sarcoplasmic reticulum (SR) terminal cisternae, forming junctions where the proteins that regulate EC coupling and SOCE are positioned. In this review, we describe the properties and roles of SOCE based on direct measurements of Ca2+ influx during SR Ca2+ release and leak. SOCE is activated immediately and locally as the [Ca2+ ] of the junctional SR terminal cisternae ([Ca2+ ]jSR ) depletes. [Ca2+ ]jSR changes rapidly and steeply with increasing activity of the SR ryanodine receptor isoform 1 (RyR1). The high fidelity of [Ca2+ ]jSR with RyR1 activity probably depends on the SR Ca2+ -buffer calsequestrin that is located immediately behind RyR1 inside the SR. This arrangement provides in-phase activation and deactivation of SOCE with a large dynamic range, allowing precise grading of SOCE flux. The in-phase activation of SOCE as the SR partially depletes traps Ca2+ in the cytoplasm, preventing net Ca2+ loss. Mild presentation of RyR1 leak can occur under physiological conditions, providing fibre Ca2+ redistribution without changing fibre Ca2+ content. This condition preserves normal contractile function at the same time as increasing basal metabolic rate. However, higher RyR1 leak drives excess cytoplasmic and mitochondrial Ca2+ load, setting a deleterious intracellular environment that compromises the function of the skeletal muscle.
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Affiliation(s)
- Luke Pearce
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Aldo Meizoso-Huesca
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Crystal Seng
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Cedric R Lamboley
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Daniel P Singh
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Bradley S Launikonis
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
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Tomek J, Nieves-Cintron M, Navedo MF, Ko CY, Bers DM. SparkMaster 2: A New Software for Automatic Analysis of Calcium Spark Data. Circ Res 2023; 133:450-462. [PMID: 37555352 PMCID: PMC7615009 DOI: 10.1161/circresaha.123.322847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 07/22/2023] [Accepted: 07/26/2023] [Indexed: 08/10/2023]
Abstract
BACKGROUND Calcium (Ca) sparks are elementary units of subcellular Ca release in cardiomyocytes and other cells. Accordingly, Ca spark imaging is an essential tool for understanding the physiology and pathophysiology of Ca handling and is used to identify new drugs targeting Ca-related cellular dysfunction (eg, cardiac arrhythmias). The large volumes of imaging data produced during such experiments require accurate and high-throughput analysis. METHODS We developed a new software tool SparkMaster 2 (SM2) for the analysis of Ca sparks imaged by confocal line-scan microscopy, combining high accuracy, flexibility, and user-friendliness. SM2 is distributed as a stand-alone application requiring no installation. It can be controlled using a simple-to-use graphical user interface, or using Python scripting. RESULTS SM2 is shown to have the following strengths: (1) high accuracy at identifying Ca release events, clearly outperforming previous highly successful software SparkMaster; (2) multiple types of Ca release events can be identified using SM2: Ca sparks, waves, miniwaves, and long sparks; (3) SM2 can accurately split and analyze individual sparks within spark clusters, a capability not handled adequately by prior tools. We demonstrate the practical utility of SM2 in two case studies, investigating how Ca levels affect spontaneous Ca release, and how large-scale release events may promote release refractoriness. SM2 is also useful in atrial and smooth muscle myocytes, across different imaging conditions. CONCLUSIONS SparkMaster 2 is a new, much-improved user-friendly software for accurate high-throughput analysis of line-scan Ca spark imaging data. It is free, easy to use, and provides valuable built-in features to facilitate visualization, analysis, and interpretation of Ca spark data. It should enhance the quality and throughput of Ca spark and wave analysis across cell types, particularly in the study of arrhythmogenic Ca release events in cardiomyocytes.
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Affiliation(s)
- Jakub Tomek
- Department of Pharmacology, University of California, Davis School of Medicine, Davis, California (J.T., M.N.-C., M.F.N., C.Y.K., D.M.B.)
- Department of Anatomy, Physiology, and Genetics, University of Oxford, Oxford, UK (J.T.)
| | - Madeline Nieves-Cintron
- Department of Pharmacology, University of California, Davis School of Medicine, Davis, California (J.T., M.N.-C., M.F.N., C.Y.K., D.M.B.)
| | - Manuel F. Navedo
- Department of Pharmacology, University of California, Davis School of Medicine, Davis, California (J.T., M.N.-C., M.F.N., C.Y.K., D.M.B.)
| | - Christopher Y. Ko
- Department of Pharmacology, University of California, Davis School of Medicine, Davis, California (J.T., M.N.-C., M.F.N., C.Y.K., D.M.B.)
| | - Donald M. Bers
- Department of Pharmacology, University of California, Davis School of Medicine, Davis, California (J.T., M.N.-C., M.F.N., C.Y.K., D.M.B.)
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35
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Tokuda N, Watanabe D, Naito A, Yamauchi N, Ashida Y, Cheng AJ, Yamada T. Intrinsic contractile dysfunction due to impaired sarcoplasmic reticulum Ca 2+ release in compensatory hypertrophied muscle fibers following synergist ablation. Am J Physiol Cell Physiol 2023; 325:C599-C612. [PMID: 37486068 DOI: 10.1152/ajpcell.00127.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 07/12/2023] [Accepted: 07/12/2023] [Indexed: 07/25/2023]
Abstract
Synergist ablation (SA) is an experimental procedure for the induction of hypertrophy. However, SA causes a decrease in specific force (i.e., force per cross-sectional area), likely due to excessive muscle use. Here, we investigated the mechanisms behind the SA-induced intrinsic contractile dysfunction, especially focusing on the excitation-contraction (EC) coupling. Male Wistar rats had unilateral surgical ablation of gastrocnemius and soleus muscles to induce compensatory hypertrophy in the plantaris muscles. Two weeks after SA, plantaris muscle was dissected from each animal and used for later analyses. SA significantly increased the mean fiber cross-sectional area (+18%). On the other hand, the ratio of depolarization-induced force to the maximum Ca2+-activated specific force, an indicator of sarcoplasmic reticulum (SR) Ca2+ release, was markedly reduced in mechanically skinned fibers from the SA group (-51%). These functional defects were accompanied by an extensive fragmentation of the SR Ca2+ release channel, the ryanodine receptor 1 (RyR1), and a decrease in the amount of other triad proteins (i.e., DHPR, STAC3, and junctophilin1). SA treatment also caused activation of calpain-1 and increased the amount of NADPH oxidase 2, endoplasmic reticulum (ER) stress proteins (i.e., Grp78, Grp94, PDI, and Ero1), and lipid peroxidation [i.e., 4-hydroxynonenal (4-HNE)] in SA-treated muscles. Our findings show that SA causes skeletal muscle weakness due to impaired EC coupling. This is likely to be induced by Ca2+-dependent degradation of triad proteins, which may result from Ca2+ leak from fragmented RyR1 triggered by increased oxidative stress.NEW & NOTEWORTHY Synergist ablation (SA) has widely been used to understand the mechanisms behind skeletal muscle hypertrophy. However, compensatory hypertrophied muscles display intrinsic contractile dysfunction, i.e., a hallmark of overuse. Here, we demonstrate that SA-induced compensatory hypertrophy is accompanied by muscle weakness due to impaired sarcoplasmic reticulum Ca2+ release. This dysfunction may be caused by the degradation of triad proteins due to the reciprocal amplification of reactive oxygen species and Ca2+ signaling at the junctional space microdomain.
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Affiliation(s)
- Nao Tokuda
- Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan
| | - Daiki Watanabe
- Graduate School of Sport and Health Sciences, Osaka University of Health and Sport Sciences, Osaka, Japan
| | - Azuma Naito
- Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan
| | - Nao Yamauchi
- Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan
| | - Yuki Ashida
- Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan
- The Japan Society for the Promotion of Science (JSPS), Tokyo, Japan
| | - Arthur J Cheng
- School of Kinesiology and Health Sciences, York University, Toronto, Ontario, Canada
| | - Takashi Yamada
- Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan
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Laasmaa M, Branovets J, Stolova J, Shen X, Rätsepso T, Balodis MJ, Grahv C, Hendrikson E, Louch WE, Birkedal R, Vendelin M. Cardiomyocytes from female compared to male mice have larger ryanodine receptor clusters and higher calcium spark frequency. J Physiol 2023; 601:4033-4052. [PMID: 37561554 DOI: 10.1113/jp284515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 07/07/2023] [Indexed: 08/11/2023] Open
Abstract
Sex differences in cardiac physiology are receiving increased attention as it has become clear that men and women have different aetiologies of cardiac disease and require different treatments. There are experimental data suggesting that male cardiomyocytes exhibit larger Ca2+ transients due to larger Ca2+ sparks and a higher excitation-contraction coupling gain; in addition, they exhibit a larger response to adrenergic stimulation with isoprenaline (ISO). Here, we studied whether there are sex differences relating to structural organization of the transverse tubular network and ryanodine receptors (RyRs). Surprisingly, we found that female cardiomyocytes exhibited a higher spark frequency in a range of spark magnitudes. While overall RyR expression and phosphorylation were the same, female cardiomyocytes had larger but fewer RyR clusters. The density of transverse t-tubules was the same, but male cardiomyocytes had more longitudinal t-tubules. The Ca2+ transients were similar in male and female cardiomyocytes under control conditions and in the presence of ISO. The synchrony of the Ca2+ transients was similar between sexes as well. Overall, our data suggest subtle sex differences in the Ca2+ influx and efflux pathways and their response to ISO, but these differences are balanced, resulting in similar Ca2+ transients in field-stimulated male and female cardiomyocytes. The higher spark frequency in female cardiomyocytes is related to the organization of RyRs into larger, but fewer clusters. KEY POINTS: During a heartbeat, the force of contraction depends on the amplitude of the calcium transient, which in turn depends on the amount of calcium released as calcium sparks through ryanodine receptors in the sarcoplasmic reticulum. Previous studies suggest that cardiomyocytes from male compared to female mice exhibit larger calcium sparks, larger sarcoplasmic reticulum calcium release and greater response to adrenergic stimulation triggering a fight-or-flight response. In contrast, we show that cardiomyocytes from female mice have a higher spark frequency during adrenergic stimulation and similar spark morphology. The higher spark frequency is related to the organization of ryanodine receptors into fewer, but larger clusters in female compared to male mouse cardiomyocytes. Despite subtle sex differences in cardiomyocyte structure and calcium fluxes, the differences are balanced, leading to similar calcium transients in cardiomyocytes from male and female mice.
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Affiliation(s)
- Martin Laasmaa
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
- Institute for Experimental Medical Research, University of Oslo, Oslo, Norway
- K.G. Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Jelena Branovets
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Jekaterina Stolova
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Xin Shen
- Institute for Experimental Medical Research, University of Oslo, Oslo, Norway
- K.G. Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Triinu Rätsepso
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Mihkel Jaan Balodis
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Cärolin Grahv
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Eliise Hendrikson
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - William Edward Louch
- Institute for Experimental Medical Research, University of Oslo, Oslo, Norway
- K.G. Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Rikke Birkedal
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
| | - Marko Vendelin
- Laboratory of Systems Biology, Department of Cybernetics, Tallinn University of Technology, Tallinn, Estonia
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Kong CHT, Cannell MB. Ca 2+ spark latency and control of intrinsic Ca 2+ release dyssynchrony in rat cardiac ventricular muscle cells. J Mol Cell Cardiol 2023; 182:44-53. [PMID: 37433391 DOI: 10.1016/j.yjmcc.2023.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 06/12/2023] [Accepted: 07/06/2023] [Indexed: 07/13/2023]
Abstract
Cardiac excitation-contraction coupling (ECC) depends on Ca2+ release from intracellular stores via ryanodine receptors (RyRs) triggered by L-type Ca2+ channels (LCCs). Uncertain numbers of RyRs and LCCs form 'couplons' whose activation produces Ca2+ sparks, which summate to form a cell-wide Ca2+ transient that switches on contraction. Voltage (Vm) changes during the action potential (AP) and stochasticity in channel gating should create variability in Ca2+ spark timing, but Ca2+ transient wavefronts have remarkable uniformity. To examine how this is achieved, we measured the Vm-dependence of evoked Ca2+ spark probability (Pspark) and latency over a wide voltage range in rat ventricular cells. With depolarising steps, Ca2+ spark latency showed a U-shaped Vm-dependence, while repolarising steps from 50 mV produced Ca2+ spark latencies that increased monotonically with Vm. A computer model based on reported channel gating and geometry reproduced our experimental data and revealed a likely RyR:LCC stoichiometry of ∼ 5:1 for the Ca2+ spark initiating complex (IC). Using the experimental AP waveform, the model revealed a high coupling fidelity (Pcpl ∼ 0.5) between each LCC opening and IC activation. The presence of ∼ 4 ICs per couplon reduced Ca2+ spark latency and increased Pspark to match experimental data. Variability in AP release timing is less than that seen with voltage steps because the AP overshoot and later repolarization decrease Pspark due to effects on LCC flux and LCC deactivation respectively. This work provides a framework for explaining the Vm- and time-dependence of Pspark, and indicates how ion channel dispersion in disease can contribute to dyssynchrony in Ca2+ release.
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Affiliation(s)
- Cherrie H T Kong
- School of Physiology, Pharmacology and Neuroscience, Faculty of Biomedical Sciences, University of Bristol, University Walk, Bristol BS8 1TD, United Kingdom.
| | - Mark B Cannell
- School of Physiology, Pharmacology and Neuroscience, Faculty of Biomedical Sciences, University of Bristol, University Walk, Bristol BS8 1TD, United Kingdom.
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Meng Z, Capel RA, Bose SJ, Bosch E, de Jong S, Planque R, Galione A, Burton RAB, Bueno-Orovio A. Lysosomal calcium loading promotes spontaneous calcium release by potentiating ryanodine receptors. Biophys J 2023; 122:3044-3059. [PMID: 37329137 PMCID: PMC10432190 DOI: 10.1016/j.bpj.2023.06.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 05/03/2023] [Accepted: 06/12/2023] [Indexed: 06/18/2023] Open
Abstract
Spontaneous calcium release by ryanodine receptors (RyRs) due to intracellular calcium overload results in delayed afterdepolarizations, closely associated with life-threatening arrhythmias. In this regard, inhibiting lysosomal calcium release by two-pore channel 2 (TPC2) knockout has been shown to reduce the incidence of ventricular arrhythmias under β-adrenergic stimulation. However, mechanistic investigations into the role of lysosomal function on RyR spontaneous release remain missing. We investigate the calcium handling mechanisms by which lysosome function modulates RyR spontaneous release, and determine how lysosomes are able to mediate arrhythmias by its influence on calcium loading. Mechanistic studies were conducted using a population of biophysically detailed mouse ventricular models including for the first time modeling of lysosomal function, and calibrated by experimental calcium transients modulated by TPC2. We demonstrate that lysosomal calcium uptake and release can synergistically provide a pathway for fast calcium transport, by which lysosomal calcium release primarily modulates sarcoplasmic reticulum calcium reuptake and RyR release. Enhancement of this lysosomal transport pathway promoted RyR spontaneous release by elevating RyR open probability. In contrast, blocking either lysosomal calcium uptake or release revealed an antiarrhythmic impact. Under conditions of calcium overload, our results indicate that these responses are strongly modulated by intercellular variability in L-type calcium current, RyR release, and sarcoplasmic reticulum calcium-ATPase reuptake. Altogether, our investigations identify that lysosomal calcium handling directly influences RyR spontaneous release by regulating RyR open probability, suggesting antiarrhythmic strategies and identifying key modulators of lysosomal proarrhythmic action.
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Affiliation(s)
- Zhaozheng Meng
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
| | - Rebecca A Capel
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
| | - Samuel J Bose
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
| | - Erik Bosch
- Department of Mathematics, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Sophia de Jong
- Department of Mathematics, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Robert Planque
- Department of Mathematics, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Antony Galione
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom
| | - Rebecca A B Burton
- Department of Pharmacology, University of Oxford, Oxford, United Kingdom.
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Martin SCT, Qadota H, Oberhauser AF, Hardin J, Benian GM. FARL-11 (STRIP1/2) is required for sarcomere and sarcoplasmic reticulum organization in C. elegans. Mol Biol Cell 2023; 34:ar86. [PMID: 37314837 PMCID: PMC10398898 DOI: 10.1091/mbc.e23-03-0083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 05/16/2023] [Accepted: 06/06/2023] [Indexed: 06/15/2023] Open
Abstract
Protein phosphatase 2A (PP2A) functions in a variety of cellular contexts. PP2A can assemble into four different complexes based on the inclusion of different regulatory or targeting subunits. The B''' regulatory subunit "striatin" forms the STRIPAK complex consisting of striatin, a catalytic subunit (PP2AC), striatin-interacting protein 1 (STRIP1), and MOB family member 4 (MOB4). In yeast and Caenorhabditis elegans, STRIP1 is required for formation of the endoplasmic reticulum (ER). Because the sarcoplasmic reticulum (SR) is the highly organized muscle-specific version of ER, we sought to determine the function of the STRIPAK complex in muscle using C. elegans. CASH-1 (striatin) and FARL-11 (STRIP1/2) form a complex in vivo, and each protein is localized to SR. Missense mutations and single amino acid losses in farl-11 and cash-1 each result in similar sarcomere disorganization. A missense mutation in farl-11 shows no detectable FARL-11 protein by immunoblot, disruption of SR organization around M-lines, and altered levels of the SR Ca+2 release channel UNC-68.
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Affiliation(s)
| | - Hiroshi Qadota
- Department of Pathology, Emory University, Atlanta, GA 30322
| | - Andres F. Oberhauser
- Department of Neurobiology, The University of Texas Medical Branch, Galveston, TX 77555
| | - Jeff Hardin
- Biophysics Program, University of Wisconsin-Madison, Madison, WI 53706
- Department of Integrative Biology, University of Wisconsin-Madison, Madison, WI 53706
| | - Guy M. Benian
- Department of Pathology, Emory University, Atlanta, GA 30322
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Velmurugan S, Liu T, Chen KC, Despa F, O'Rourke B, Despa S. Distinct Effects of Mitochondrial Na +/Ca 2+ Exchanger Inhibition and Ca 2+ Uniporter Activation on Ca 2+ Sparks and Arrhythmogenesis in Diabetic Rats. J Am Heart Assoc 2023; 12:e029997. [PMID: 37421267 PMCID: PMC10382117 DOI: 10.1161/jaha.123.029997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Accepted: 05/26/2023] [Indexed: 07/10/2023]
Abstract
Background Mitochondrial dysfunction contributes to the cardiac remodeling triggered by type 2 diabetes (T2D). Mitochondrial Ca2+ concentration ([Ca2+]m) modulates the oxidative state and cytosolic Ca2+ regulation. Thus, we investigated how T2D affects mitochondrial Ca2+ fluxes, the downstream consequences on myocyte function, and the effects of normalizing mitochondrial Ca2+ transport. Methods and Results We compared myocytes/hearts from transgenic rats with late-onset T2D (rats that develop late-onset T2D due to heterozygous expression of human amylin in the pancreatic β-cells [HIP] model) and their nondiabetic wild-type (WT) littermates. [Ca2+]m was significantly lower in myocytes from diabetic HIP rats compared with WT cells. Ca2+ extrusion through the mitochondrial Na+/Ca2+ exchanger (mitoNCX) was elevated in HIP versus WT myocytes, particularly at moderate and high [Ca2+]m, while mitochondrial Ca2+ uptake was diminished. Mitochondrial Na+ concentration was comparable in WT and HIP rat myocytes and remained remarkably stable while manipulating mitoNCX activity. Lower [Ca2+]m was associated with oxidative stress, increased sarcoplasmic reticulum Ca2+ leak in the form of Ca2+ sparks, and mitochondrial dysfunction in T2D hearts. MitoNCX inhibition with CGP-37157 reduced oxidative stress, Ca2+ spark frequency, and stress-induced arrhythmias in HIP rat hearts while having no significant effect in WT rats. In contrast, activation of the mitochondrial Ca2+ uniporter with SB-202190 enhanced spontaneous sarcoplasmic reticulum Ca2+ release and had no significant effect on arrhythmias in both WT and HIP rat hearts. Conclusions [Ca2+]m is reduced in myocytes from rats with T2D due to a combination of exacerbated mitochondrial Ca2+ extrusion through mitoNCX and impaired mitochondrial Ca2+ uptake. Partial mitoNCX inhibition limits sarcoplasmic reticulum Ca2+ leak and arrhythmias in T2D hearts, whereas mitochondrial Ca2+ uniporter activation does not.
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Affiliation(s)
- Sathya Velmurugan
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
| | - Ting Liu
- Division of Cardiology, Department of MedicineThe Johns Hopkins UniversityBaltimoreMDUSA
| | - Kuey C. Chen
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
| | - Florin Despa
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
| | - Brian O'Rourke
- Division of Cardiology, Department of MedicineThe Johns Hopkins UniversityBaltimoreMDUSA
| | - Sanda Despa
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
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Voigt N, Seibertz F, Fakuade FE. Vicious Twins: RyR2 Dysfunction and Structural Remodeling. Circ Res 2023; 133:193-195. [PMID: 37410856 DOI: 10.1161/circresaha.123.323144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Affiliation(s)
- Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V., F.S., F.E.F.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V., F.S., F.E.F.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany (N.V., F.S., F.E.F.)
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V., F.S., F.E.F.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V., F.S., F.E.F.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany (N.V., F.S., F.E.F.)
| | - Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V., F.S., F.E.F.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V., F.S., F.E.F.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany (N.V., F.S., F.E.F.)
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Ni M, Li Y, Wei J, Song Z, Wang H, Yao J, Chen YX, Belke D, Estillore JP, Wang R, Vallmitjana A, Benitez R, Hove-Madsen L, Feng W, Chen J, Roston TM, Sanatani S, Lehman A, Chen SRW. Increased Ca 2+ Transient Underlies RyR2-Related Left Ventricular Noncompaction. Circ Res 2023; 133:177-192. [PMID: 37325910 DOI: 10.1161/circresaha.123.322504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 06/07/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND A loss-of-function cardiac ryanodine receptor (RyR2) mutation, I4855M+/-, has recently been linked to a new cardiac disorder termed RyR2 Ca2+ release deficiency syndrome (CRDS) as well as left ventricular noncompaction (LVNC). The mechanism by which RyR2 loss-of-function causes CRDS has been extensively studied, but the mechanism underlying RyR2 loss-of-function-associated LVNC is unknown. Here, we determined the impact of a CRDS-LVNC-associated RyR2-I4855M+/- loss-of-function mutation on cardiac structure and function. METHODS We generated a mouse model expressing the CRDS-LVNC-associated RyR2-I4855M+/- mutation. Histological analysis, echocardiography, ECG recording, and intact heart Ca2+ imaging were performed to characterize the structural and functional consequences of the RyR2-I4855M+/- mutation. RESULTS As in humans, RyR2-I4855M+/- mice displayed LVNC characterized by cardiac hypertrabeculation and noncompaction. RyR2-I4855M+/- mice were highly susceptible to electrical stimulation-induced ventricular arrhythmias but protected from stress-induced ventricular arrhythmias. Unexpectedly, the RyR2-I4855M+/- mutation increased the peak Ca2+ transient but did not alter the L-type Ca2+ current, suggesting an increase in Ca2+-induced Ca2+ release gain. The RyR2-I4855M+/- mutation abolished sarcoplasmic reticulum store overload-induced Ca2+ release or Ca2+ leak, elevated sarcoplasmic reticulum Ca2+ load, prolonged Ca2+ transient decay, and elevated end-diastolic Ca2+ level upon rapid pacing. Immunoblotting revealed increased level of phosphorylated CaMKII (Ca2+-calmodulin dependent protein kinases II) but unchanged levels of CaMKII, calcineurin, and other Ca2+ handling proteins in the RyR2-I4855M+/- mutant compared with wild type. CONCLUSIONS The RyR2-I4855M+/- mutant mice represent the first RyR2-associated LVNC animal model that recapitulates the CRDS-LVNC overlapping phenotype in humans. The RyR2-I4855M+/- mutation increases the peak Ca2+ transient by increasing the Ca2+-induced Ca2+ release gain and the end-diastolic Ca2+ level by prolonging Ca2+ transient decay. Our data suggest that the increased peak-systolic and end-diastolic Ca2+ levels may underlie RyR2-associated LVNC.
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Affiliation(s)
- Mingke Ni
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
| | - Yanhui Li
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
| | - Jinhong Wei
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
- School of Medicine, Northwest University, Xi 'an, China (J.W.)
| | - Zhenpeng Song
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
| | - Hui Wang
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
| | - Jinjing Yao
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
| | - Yong-Xiang Chen
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
| | - Darrell Belke
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
| | - John Paul Estillore
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
| | - Ruiwu Wang
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
| | - Alexander Vallmitjana
- Department of Automatic Control, Universitat Politècnica de Catalunya, Barcelona, Spain (A.V., R.B.)
| | - Raul Benitez
- Department of Automatic Control, Universitat Politècnica de Catalunya, Barcelona, Spain (A.V., R.B.)
- Institut de Recerca Sant Joan de Déu (IRSJD), Barcelona, Spain (R.B.)
| | - Leif Hove-Madsen
- Biomedical Research Institute Barcelona IIBB-CSIC, IIB Sant Pau and CIBERCV, Hospital de Sant Pau, Barcelona, Spain (L.H.-M.)
| | - Wei Feng
- Department of Medicine, School of Medicine, University of California, San Diego, La Jolla (W.F., J.C.)
| | - Ju Chen
- Department of Medicine, School of Medicine, University of California, San Diego, La Jolla (W.F., J.C.)
| | - Thomas M Roston
- Division of Pediatric Cardiology, Department of Pediatrics (T.M.R., S.S.), University of British Columbia, Vancouver, Canada
| | - Shubhayan Sanatani
- Division of Pediatric Cardiology, Department of Pediatrics (T.M.R., S.S.), University of British Columbia, Vancouver, Canada
| | - Anna Lehman
- Department of Medical Genetics (A.L.), University of British Columbia, Vancouver, Canada
| | - S R Wayne Chen
- Department of Physiology and Pharmacology, Libin Cardiovascular Institute, University of Calgary, Alberta, Canada (M.N., Y.L., J.W., Z.S., H.W., J.Y., Y.-X.C., D.B., J.P.E., R.W., S.R.W.C.)
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Mira Hernandez J, Ko CY, Mandel AR, Shen EY, Baidar S, Christensen AR, Hellgren K, Morotti S, Martin JL, Hegyi B, Bossuyt J, Bers DM. Cardiac Protein Kinase D1 ablation alters the myocytes β-adrenergic response. J Mol Cell Cardiol 2023; 180:33-43. [PMID: 37149124 DOI: 10.1016/j.yjmcc.2023.05.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 05/01/2023] [Accepted: 05/03/2023] [Indexed: 05/08/2023]
Abstract
β-adrenergic (β-AR) signaling is essential for the adaptation of the heart to exercise and stress. Chronic stress leads to the activation of Ca2+/calmodulin-dependent kinase II (CaMKII) and protein kinase D (PKD). Unlike CaMKII, the effects of PKD on excitation-contraction coupling (ECC) remain unclear. To elucidate the mechanisms of PKD-dependent ECC regulation, we used hearts from cardiac-specific PKD1 knockout (PKD1 cKO) mice and wild-type (WT) littermates. We measured calcium transients (CaT), Ca2+ sparks, contraction and L-type Ca2+ current in paced cardiomyocytes under acute β-AR stimulation with isoproterenol (ISO; 100 nM). Sarcoplasmic reticulum (SR) Ca2+ load was assessed by rapid caffeine (10 mM) induced Ca2+ release. Expression and phosphorylation of ECC proteins phospholambam (PLB), troponin I (TnI), ryanodine receptor (RyR), sarcoendoplasmic reticulum Ca2+ ATPase (SERCA) were evaluated by western blotting. At baseline, CaT amplitude and decay tau, Ca2+ spark frequency, SR Ca2+ load, L-type Ca2+ current, contractility, and expression and phosphorylation of ECC protein were all similar in PKD1 cKO vs. WT. However, PKD1 cKO cardiomyocytes presented a diminished ISO response vs. WT with less increase in CaT amplitude, slower [Ca2+]i decline, lower Ca2+ spark rate and lower RyR phosphorylation, but with similar SR Ca2+ load, L-type Ca2+ current, contraction and phosphorylation of PLB and TnI. We infer that the presence of PKD1 allows full cardiomyocyte β-adrenergic responsiveness by allowing optimal enhancement in SR Ca2+ uptake and RyR sensitivity, but not altering L-type Ca2+ current, TnI phosphorylation or contractile response. Further studies are necessary to elucidate the specific mechanisms by which PKD1 is regulating RyR sensitivity. We conclude that the presence of basal PKD1 activity in cardiac ventricular myocytes contributes to normal β-adrenergic responses in Ca2+ handling.
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Affiliation(s)
- Juliana Mira Hernandez
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America; Research Group in Veterinary Medicine-GIVET, School of Veterinary Medicine, University Corporation Lasallista, Caldas, Antioquia, Colombia
| | - Christopher Y Ko
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America
| | - Avery R Mandel
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America
| | - Erin Y Shen
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America
| | - Sonya Baidar
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America
| | - Ashley R Christensen
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America
| | - Kim Hellgren
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America
| | - Stefano Morotti
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America
| | - Jody L Martin
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America; Cardiovascular Research Institute, University of California, Davis, Davis, CA 95616, United States of America
| | - Bence Hegyi
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America
| | - Julie Bossuyt
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America.
| | - Donald M Bers
- Department of Pharmacology, University of California, Davis, Davis, CA 95616, United States of America.
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Kim K, Blackwell DJ, Yuen SL, Thorpe MP, Johnston JN, Cornea RL, Knollmann BC. The selective RyR2 inhibitor ent-verticilide suppresses atrial fibrillation susceptibility caused by Pitx2 deficiency. J Mol Cell Cardiol 2023; 180:1-9. [PMID: 37080450 PMCID: PMC10330243 DOI: 10.1016/j.yjmcc.2023.04.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 03/25/2023] [Accepted: 04/17/2023] [Indexed: 04/22/2023]
Abstract
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia and a major cause of stroke and morbidity. The strongest genetic risk factors for AF in humans are variants on chromosome 4q25, near the paired-like homeobox transcription factor 2 gene PITX2. Although mice deficient in Pitx2 (Pitx2+/-) have increased AF susceptibility, the mechanism remains controversial. Recent evidence has implicated hyperactivation of the cardiac ryanodine receptor (RyR2) in Pitx2 deficiency, which may be associated with AF susceptibility. We investigated pacing-induced AF susceptibility and spontaneous Ca2+ release events in Pitx2 haploinsufficient (+/-) mice and isolated atrial myocytes to test the hypothesis that hyperactivity of RyR2 increases susceptibility to AF, which can be prevented by a potent and selective RyR2 channel inhibitor, ent-verticilide. Compared with littermate wild-type Pitx2+/+, the frequency of Ca2+ sparks and spontaneous Ca2+ release events increased in permeabilized and intact atrial myocytes from Pitx2+/- mice. Atrial burst pacing consistently increased the incidence and duration of AF in Pitx2+/- mice. The RyR2 inhibitor ent-verticilide significantly reduced the frequency of spontaneous Ca2+ release in intact atrial myocytes and attenuated AF susceptibility with reduced AF incidence and duration. Our data demonstrate that RyR2 hyperactivity enhances SR Ca2+ leak and AF inducibility in Pitx2+/- mice via abnormal Ca2+ handling. Therapeutic targeting of hyperactive RyR2 in AF using ent-verticilide may be a viable mechanism-based approach to treat atrial arrhythmias caused by Pitx2 deficiency.
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Affiliation(s)
- Kyungsoo Kim
- Vanderbilt Center for Arrhythmia Research and Therapeutics, Division of Clinical Pharmacology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Daniel J Blackwell
- Vanderbilt Center for Arrhythmia Research and Therapeutics, Division of Clinical Pharmacology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Samantha L Yuen
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Madelaine P Thorpe
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN, USA
| | - Jeffrey N Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN, USA
| | - Razvan L Cornea
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Björn C Knollmann
- Vanderbilt Center for Arrhythmia Research and Therapeutics, Division of Clinical Pharmacology, Vanderbilt University Medical Center, Nashville, TN, USA.
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Balderas-Villalobos J, Medina-Contreras JML, Lynch C, Kabadi R, Ramirez RJ, Tan AY, Kaszala K, Samsó M, Huizar JF, Eltit JM. Alterations of sarcoplasmic reticulum-mediated Ca 2+ uptake in a model of premature ventricular contraction (PVC)-induced cardiomyopathy. Mol Cell Biochem 2023; 478:1447-1456. [PMID: 36350464 PMCID: PMC10685401 DOI: 10.1007/s11010-022-04605-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 10/28/2022] [Indexed: 11/11/2022]
Abstract
Premature ventricular contractions (PVCs) are the most frequent ventricular arrhythmias in the overall population. PVCs are known to acutely enhance contractility by the post-extrasystolic potentiation phenomenon, but over time persistent PVCs promote PVC-induced cardiomyopathy (PVC-CM), characterized by a reduction of the left ventricular (LV) ejection fraction. Ca2+ cycling in myocytes commands muscle contraction and in this process, SERCA2 leads the Ca2+ reuptake into the sarcoplasmic reticulum (SR) shaping cytosolic Ca2+ signal decay and muscle relaxation. Altered Ca2+ reuptake can contribute to the contractile dysfunction observed in PVC-CM. To better understand Ca2+ handling using our PVC-CM model (canines with 50% PVC burden for 12 weeks), SR-Ca2+ reuptake was investigated by measuring Ca2+ dynamics and analyzing protein expression. Kinetic analysis of Ca2+ reuptake in electrically paced myocytes showed a ~ 21 ms delay in PVC-CM compared to Sham in intact isolated myocytes, along with a ~ 13% reduction in SERCA2 activity assessed in permeabilized myocytes. Although these trends were not statistically significant between groups using hierarchical statistics, relaxation of myocytes following contraction was significantly slower in PVC-CM vs Sham myocytes. Western blot analyses indicate a 22% reduction in SERCA2 expression, a 23% increase in phospholamban (PLN) expression, and a 50% reduction in PLN phosphorylation in PVC-CM samples vs Sham. Computational analysis simulating a 20% decrease in SR-Ca2+ reuptake resulted in a ~ 22 ms delay in Ca2+ signal decay, consistent with the experimental result described above. In conclusion, SERCA2 and PLB alterations described above have a modest contribution to functional adaptations observed in PVC-CM.
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Affiliation(s)
- Jaime Balderas-Villalobos
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, 1101 E Marshall St, 3-038H, Richmond, VA, 23298, USA
| | - J M L Medina-Contreras
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, 1101 E Marshall St, 3-038H, Richmond, VA, 23298, USA
| | - Christopher Lynch
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, 1101 E Marshall St, 3-038H, Richmond, VA, 23298, USA
| | - Rajiv Kabadi
- Pauley Heart Center, Virginia Commonwealth University, Richmond, VA, USA
| | - Rafael J Ramirez
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, 1101 E Marshall St, 3-038H, Richmond, VA, 23298, USA
| | - Alex Y Tan
- Pauley Heart Center, Virginia Commonwealth University, Richmond, VA, USA
- Hunter Holmes McGuire Veterans Affairs Medical Center, Richmond, VA, USA
| | - Karoly Kaszala
- Pauley Heart Center, Virginia Commonwealth University, Richmond, VA, USA
- Hunter Holmes McGuire Veterans Affairs Medical Center, Richmond, VA, USA
| | - Montserrat Samsó
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, 1101 E Marshall St, 3-038H, Richmond, VA, 23298, USA
| | - Jose F Huizar
- Pauley Heart Center, Virginia Commonwealth University, Richmond, VA, USA
- Hunter Holmes McGuire Veterans Affairs Medical Center, Richmond, VA, USA
| | - Jose M Eltit
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, 1101 E Marshall St, 3-038H, Richmond, VA, 23298, USA.
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Ednie AR, Paul-Onyia CD, Bennett ES. Reduced O-GlcNAcylation diminishes cardiomyocyte Ca 2+ dependent facilitation and frequency dependent acceleration of relaxation. J Mol Cell Cardiol 2023; 180:10-21. [PMID: 37120927 DOI: 10.1016/j.yjmcc.2023.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 04/12/2023] [Accepted: 04/19/2023] [Indexed: 05/02/2023]
Abstract
Ca2+ dependent facilitation (CDF) and frequency dependent acceleration of relaxation (FDAR) are regulatory mechanisms that potentiate cardiomyocyte Ca2+ channel function and increase the rate of Ca2+ sequestration following a Ca2+-release event, respectively, when depolarization frequency increases. CDF and FDAR likely evolved to maintain EC coupling at increased heart rates. Ca2+/calmodulin-dependent kinase II (CaMKII) was shown to be indispensable to both; however, the mechanisms remain to be completely elucidated. CaMKII activity can be modulated by post-translational modifications but if and how these modifications impact CDF and FDAR is unknown. Intracellular O-linked glycosylation (O-GlcNAcylation) is a post-translational modification that acts as a signaling molecule and metabolic sensor. In hyperglycemic conditions, CaMKII was shown to be O-GlcNAcylated resulting in pathologic activity. Here we sought to investigate whether O-GlcNAcylation impacts CDF and FDAR through modulation of CaMKII activity in a pseudo-physiologic setting. Using voltage-clamp and Ca2+ photometry we show that cardiomyocyte CDF and FDAR are significantly diminished in conditions of reduced O-GlcNAcylation. Immunoblot showed that CaMKIIδ and calmodulin expression are increased but the autophosphorylation of CaMKIIδ and the muscle cell-specific CaMKIIβ isoform are reduced by 75% or more when O-GlcNAcylation is inhibited. We also show that the enzyme responsible for O-GlcNAcylation (OGT) can likely be localized in the dyad space and/or at the cardiac sarcoplasmic reticulum and is precipitated by calmodulin in a Ca2+ dependent manner. These findings will have important implications for our understanding of how CaMKII and OGT interact to impact cardiomyocyte EC coupling in normal physiologic settings as well as in disease states where CaMKII and OGT may be aberrantly regulated.
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Affiliation(s)
- Andrew R Ednie
- Department of Neuroscience, Cell Biology & Physiology, Boonshoft School of Medicine and College of Science and Mathematics, Wright State University, Dayton, OH, USA.
| | - Chiagozie D Paul-Onyia
- Department of Neuroscience, Cell Biology & Physiology, Boonshoft School of Medicine and College of Science and Mathematics, Wright State University, Dayton, OH, USA
| | - Eric S Bennett
- Department of Neuroscience, Cell Biology & Physiology, Boonshoft School of Medicine and College of Science and Mathematics, Wright State University, Dayton, OH, USA
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Gonnot F, Boulogne L, Brun C, Dia M, Gouriou Y, Bidaux G, Chouabe C, Crola Da Silva C, Ducreux S, Pillot B, Kaczmarczyk A, Leon C, Chanon S, Perret C, Sciandra F, Dargar T, Gache V, Farhat F, Sebbag L, Bochaton T, Thibault H, Ovize M, Paillard M, Gomez L. SERCA2 phosphorylation at serine 663 is a key regulator of Ca 2+ homeostasis in heart diseases. Nat Commun 2023; 14:3346. [PMID: 37291092 PMCID: PMC10250397 DOI: 10.1038/s41467-023-39027-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Accepted: 05/26/2023] [Indexed: 06/10/2023] Open
Abstract
Despite advances in cardioprotection, new therapeutic strategies capable of preventing ischemia-reperfusion injury of patients are still needed. Here, we discover that sarcoplasmic/endoplasmic reticulum Ca2+ ATPase (SERCA2) phosphorylation at serine 663 is a clinical and pathophysiological event of cardiac function. Indeed, the phosphorylation level of SERCA2 at serine 663 is increased in ischemic hearts of patients and mouse. Analyses on different human cell lines indicate that preventing serine 663 phosphorylation significantly increases SERCA2 activity and protects against cell death, by counteracting cytosolic and mitochondrial Ca2+ overload. By identifying the phosphorylation level of SERCA2 at serine 663 as an essential regulator of SERCA2 activity, Ca2+ homeostasis and infarct size, these data contribute to a more comprehensive understanding of the excitation/contraction coupling of cardiomyocytes and establish the pathophysiological role and the therapeutic potential of SERCA2 modulation in acute myocardial infarction, based on the hotspot phosphorylation level of SERCA2 at serine 663 residue.
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Affiliation(s)
- Fabrice Gonnot
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Laura Boulogne
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Camille Brun
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Maya Dia
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Yves Gouriou
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Gabriel Bidaux
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Christophe Chouabe
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Claire Crola Da Silva
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Sylvie Ducreux
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Bruno Pillot
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Andrea Kaczmarczyk
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Christelle Leon
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Stephanie Chanon
- Laboratoire CarMeN, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, Functional Lipidomic Plateform, Lyon, France
| | - Coralie Perret
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Franck Sciandra
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Tanushri Dargar
- Institut NeuroMyoGène INMG-PNMG, CNRS UMR5261, INSERM U1315, Université Claude Bernard Lyon 1, Lyon, France
| | - Vincent Gache
- Institut NeuroMyoGène INMG-PNMG, CNRS UMR5261, INSERM U1315, Université Claude Bernard Lyon 1, Lyon, France
| | - Fadi Farhat
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
- Hôpital Louis Pradel, Hospices Civils de Lyon, 59 boulevard Pinel, F-69500, Bron, France
- Cardiac Surgery Department, Hospices Civils de Lyon, Hôpital Louis Pradel, 69500, Bron, France
| | - Laurent Sebbag
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
- Hôpital Louis Pradel, Hospices Civils de Lyon, 59 boulevard Pinel, F-69500, Bron, France
- Heart Failure and Transplant Department, Hospices Civils de Lyon, Hôpital Louis Pradel, 69500, Bron, France
| | - Thomas Bochaton
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
- Hôpital Louis Pradel, Hospices Civils de Lyon, 59 boulevard Pinel, F-69500, Bron, France
| | - Helene Thibault
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
- Hôpital Louis Pradel, Hospices Civils de Lyon, 59 boulevard Pinel, F-69500, Bron, France
| | - Michel Ovize
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
- Hôpital Louis Pradel, Hospices Civils de Lyon, 59 boulevard Pinel, F-69500, Bron, France
| | - Melanie Paillard
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France
| | - Ludovic Gomez
- Laboratoire CarMeN - IRIS Team, INSERM, INRA, Université Claude Bernard Lyon-1, INSA-Lyon, Univ-Lyon, 69500, Bron, France.
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Nichtová Z, Fernandez-Sanz C, De La Fuente S, Yuan Y, Hurst S, Lanvermann S, Tsai HY, Weaver D, Baggett A, Thompson C, Bouchet-Marquis C, Várnai P, Seifert EL, Dorn GW, Sheu SS, Csordás G. Enhanced Mitochondria-SR Tethering Triggers Adaptive Cardiac Muscle Remodeling. Circ Res 2023; 132:e171-e187. [PMID: 37057625 PMCID: PMC10213149 DOI: 10.1161/circresaha.122.321833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 03/29/2023] [Indexed: 04/15/2023]
Abstract
BACKGROUND Cardiac contractile function requires high energy from mitochondria, and Ca2+ from the sarcoplasmic reticulum (SR). Via local Ca2+ transfer at close mitochondria-SR contacts, cardiac excitation feedforward regulates mitochondrial ATP production to match surges in demand (excitation-bioenergetics coupling). However, pathological stresses may cause mitochondrial Ca2+ overload, excessive reactive oxygen species production and permeability transition, risking homeostatic collapse and myocyte loss. Excitation-bioenergetics coupling involves mitochondria-SR tethers but the role of tethering in cardiac physiology/pathology is debated. Endogenous tether proteins are multifunctional; therefore, nonselective targets to scrutinize interorganelle linkage. Here, we assessed the physiological/pathological relevance of selective chronic enhancement of cardiac mitochondria-SR tethering. METHODS We introduced to mice a cardiac muscle-specific engineered tether (linker) transgene with a fluorescent protein core and deployed 2D/3D electron microscopy, biochemical approaches, fluorescence imaging, in vivo and ex vivo cardiac performance monitoring and stress challenges to characterize the linker phenotype. RESULTS Expressed in the mature cardiomyocytes, the linker expanded and tightened individual mitochondria-junctional SR contacts; but also evoked a marked remodeling with large dense mitochondrial clusters that excluded dyads. Yet, excitation-bioenergetics coupling remained well-preserved, likely due to more longitudinal mitochondria-dyad contacts and nanotunnelling between mitochondria exposed to junctional SR and those sealed away from junctional SR. Remarkably, the linker decreased female vulnerability to acute massive β-adrenergic stress. It also reduced myocyte death and mitochondrial calcium-overload-associated myocardial impairment in ex vivo ischemia/reperfusion injury. CONCLUSIONS We propose that mitochondria-SR/endoplasmic reticulum contacts operate at a structural optimum. Although acute changes in tethering may cause dysfunction, upon chronic enhancement of contacts from early life, adaptive remodeling of the organelles shifts the system to a new, stable structural optimum. This remodeling balances the individually enhanced mitochondrion-junctional SR crosstalk and excitation-bioenergetics coupling, by increasing the connected mitochondrial pool and, presumably, Ca2+/reactive oxygen species capacity, which then improves the resilience to stresses associated with dysregulated hyperactive Ca2+ signaling.
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Affiliation(s)
- Zuzana Nichtová
- MitoCare, Pathology and Genomic Medicine, TJUH, Philadelphia, PA, USA
| | - Celia Fernandez-Sanz
- Center of Translational Medicine, TJUH, Philadelphia, PA, USA
- These authors contributed equally
| | - Sergio De La Fuente
- Center of Translational Medicine, TJUH, Philadelphia, PA, USA
- These authors contributed equally
| | - Yuexing Yuan
- Center of Translational Medicine, TJUH, Philadelphia, PA, USA
| | - Stephen Hurst
- MitoCare, Pathology and Genomic Medicine, TJUH, Philadelphia, PA, USA
| | | | - Hui-Ying Tsai
- Center of Translational Medicine, TJUH, Philadelphia, PA, USA
| | - David Weaver
- MitoCare, Pathology and Genomic Medicine, TJUH, Philadelphia, PA, USA
| | - Ariele Baggett
- MitoCare, Pathology and Genomic Medicine, TJUH, Philadelphia, PA, USA
| | | | | | - Péter Várnai
- Department of Physiology, Faculty of Medicine, Semmelweis Univ., Budapest, Hungary
| | - Erin L Seifert
- MitoCare, Pathology and Genomic Medicine, TJUH, Philadelphia, PA, USA
| | - Gerald W Dorn
- Center for Pharmacogenomics, John T. Milliken Dep. Med., WUSM, St Louis, MO, USA
| | - Shey-Shing Sheu
- Center of Translational Medicine, TJUH, Philadelphia, PA, USA
| | - György Csordás
- MitoCare, Pathology and Genomic Medicine, TJUH, Philadelphia, PA, USA
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Skogestad J, Albert I, Hougen K, Lothe GB, Lunde M, Eken OS, Veras I, Huynh NTT, Børstad M, Marshall S, Shen X, Louch WE, Robinson EL, Cleveland JC, Ambardekar AV, Schwisow JA, Jonas E, Calejo AI, Morth JP, Taskén K, Melleby AO, Lunde PK, Sjaastad I, Carlson CR, Aronsen JM. Disruption of Phosphodiesterase 3A Binding to SERCA2 Increases SERCA2 Activity and Reduces Mortality in Mice With Chronic Heart Failure. Circulation 2023; 147:1221-1236. [PMID: 36876489 DOI: 10.1161/circulationaha.121.054168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 02/08/2023] [Indexed: 03/07/2023]
Abstract
BACKGROUND Increasing SERCA2 (sarco[endo]-plasmic reticulum Ca2+ ATPase 2) activity is suggested to be beneficial in chronic heart failure, but no selective SERCA2-activating drugs are available. PDE3A (phosphodiesterase 3A) is proposed to be present in the SERCA2 interactome and limit SERCA2 activity. Disruption of PDE3A from SERCA2 might thus be a strategy to develop SERCA2 activators. METHODS Confocal microscopy, 2-color direct stochastic optical reconstruction microscopy, proximity ligation assays, immunoprecipitations, peptide arrays, and surface plasmon resonance were used to investigate colocalization between SERCA2 and PDE3A in cardiomyocytes, map the SERCA2/PDE3A interaction sites, and optimize disruptor peptides that release PDE3A from SERCA2. Functional experiments assessing the effect of PDE3A-binding to SERCA2 were performed in cardiomyocytes and HEK293 vesicles. The effect of SERCA2/PDE3A disruption by the disruptor peptide OptF (optimized peptide F) on cardiac mortality and function was evaluated during 20 weeks in 2 consecutive randomized, blinded, and controlled preclinical trials in a total of 148 mice injected with recombinant adeno-associated virus 9 (rAAV9)-OptF, rAAV9-control (Ctrl), or PBS, before undergoing aortic banding (AB) or sham surgery and subsequent phenotyping with serial echocardiography, cardiac magnetic resonance imaging, histology, and functional and molecular assays. RESULTS PDE3A colocalized with SERCA2 in human nonfailing, human failing, and rodent myocardium. Amino acids 277-402 of PDE3A bound directly to amino acids 169-216 within the actuator domain of SERCA2. Disruption of PDE3A from SERCA2 increased SERCA2 activity in normal and failing cardiomyocytes. SERCA2/PDE3A disruptor peptides increased SERCA2 activity also in the presence of protein kinase A inhibitors and in phospholamban-deficient mice, and had no effect in mice with cardiomyocyte-specific inactivation of SERCA2. Cotransfection of PDE3A reduced SERCA2 activity in HEK293 vesicles. Treatment with rAAV9-OptF reduced cardiac mortality compared with rAAV9-Ctrl (hazard ratio, 0.26 [95% CI, 0.11 to 0.63]) and PBS (hazard ratio, 0.28 [95% CI, 0.09 to 0.90]) 20 weeks after AB. Mice injected with rAAV9-OptF had improved contractility and no difference in cardiac remodeling compared with rAAV9-Ctrl after aortic banding. CONCLUSIONS Our results suggest that PDE3A regulates SERCA2 activity through direct binding, independently of the catalytic activity of PDE3A. Targeting the SERCA2/PDE3A interaction prevented cardiac mortality after AB, most likely by improving cardiac contractility.
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Affiliation(s)
- Jonas Skogestad
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Ingrid Albert
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Karina Hougen
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Gustav B Lothe
- Department of Pharmacology, Oslo University Hospital, Norway (G.B.L.)
- Bjørknes College, Oslo, Norway (G.B.L., J.M.A.)
| | - Marianne Lunde
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Olav Søvik Eken
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
| | - Ioanni Veras
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
| | - Ngoc Trang Thi Huynh
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
| | - Mira Børstad
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Serena Marshall
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Xin Shen
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - William E Louch
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Emma Louise Robinson
- Division of Cardiology, Department of Medicine (E.L.R., A.V.A., J.A.S., E.J.), University of Colorado Anschutz Medical Campus, Aurora
| | - Joseph C Cleveland
- Department of Surgery (J.C.C.), University of Colorado Anschutz Medical Campus, Aurora
| | - Amrut V Ambardekar
- Division of Cardiology, Department of Medicine (E.L.R., A.V.A., J.A.S., E.J.), University of Colorado Anschutz Medical Campus, Aurora
| | - Jessica A Schwisow
- Division of Cardiology, Department of Medicine (E.L.R., A.V.A., J.A.S., E.J.), University of Colorado Anschutz Medical Campus, Aurora
| | - Eric Jonas
- Division of Cardiology, Department of Medicine (E.L.R., A.V.A., J.A.S., E.J.), University of Colorado Anschutz Medical Campus, Aurora
| | - Ana I Calejo
- Centre for Molecular Medicine Norway, Nordic European Molecular Biology Laboratory Partnership (A.I.C.C., J.P.M., K.T.), Oslo University Hospital and University of Oslo, Norway
| | - Jens Preben Morth
- Centre for Molecular Medicine Norway, Nordic European Molecular Biology Laboratory Partnership (A.I.C.C., J.P.M., K.T.), Oslo University Hospital and University of Oslo, Norway
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby (J.P.M.)
| | - Kjetil Taskén
- Centre for Molecular Medicine Norway, Nordic European Molecular Biology Laboratory Partnership (A.I.C.C., J.P.M., K.T.), Oslo University Hospital and University of Oslo, Norway
- Institute for Cancer Research, Oslo University Hospital and Institute for Clinical Medicine, University of Oslo, Norway (K.T.)
| | - Arne Olav Melleby
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
| | - Per Kristian Lunde
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Ivar Sjaastad
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Cathrine Rein Carlson
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Jan Magnus Aronsen
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
- Bjørknes College, Oslo, Norway (G.B.L., J.M.A.)
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
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Jaque-Fernandez F, Allard B, Monteiro L, Lafoux A, Huchet C, Jaimovich E, Berthier C, Jacquemond V. Probenecid affects muscle Ca2+ homeostasis and contraction independently from pannexin channel block. J Gen Physiol 2023; 155:e202213203. [PMID: 36820799 PMCID: PMC9998970 DOI: 10.1085/jgp.202213203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 12/21/2022] [Accepted: 02/08/2023] [Indexed: 02/24/2023] Open
Abstract
Tight control of skeletal muscle contractile activation is secured by the excitation-contraction (EC) coupling protein complex, a molecular machinery allowing the plasma membrane voltage to control the activity of the ryanodine receptor Ca2+ release channel in the sarcoplasmic reticulum (SR) membrane. This machinery has been shown to be intimately linked to the plasma membrane protein pannexin-1 (Panx1). We investigated whether the prescription drug probenecid, a widely used Panx1 blocker, affects Ca2+ signaling, EC coupling, and muscle force. The effect of probenecid was tested on membrane current, resting Ca2+, and SR Ca2+ release in isolated mouse muscle fibers, using a combination of whole-cell voltage-clamp and Ca2+ imaging, and on electrically triggered contraction of isolated muscles. Probenecid (1 mM) induces SR Ca2+ leak at rest and reduces peak voltage-activated SR Ca2+ release and contractile force by 40%. Carbenoxolone, another Panx1 blocker, also reduces Ca2+ release, but neither a Panx1 channel inhibitory peptide nor a purinergic antagonist affected Ca2+ release, suggesting that probenecid and carbenoxolone do not act through inhibition of Panx1-mediated ATP release and consequently altered purinergic signaling. Probenecid may act by altering Panx1 interaction with the EC coupling machinery, yet the implication of another molecular target cannot be excluded. Since probenecid has been used both in the clinic and as a masking agent for doping in sports, these results should encourage evaluation of possible effects on muscle function in treated individuals. In addition, they also raise the question of whether probenecid-induced altered Ca2+ homeostasis may be shared by other tissues.
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Affiliation(s)
- Francisco Jaque-Fernandez
- Université Lyon, Université Claude Bernard Lyon 1, CNRS UMR-5261, INSERM U-1315, Institut NeuroMyoGène—Pathophysiology and Genetics of Neuron and Muscle, Lyon, France
| | - Bruno Allard
- Université Lyon, Université Claude Bernard Lyon 1, CNRS UMR-5261, INSERM U-1315, Institut NeuroMyoGène—Pathophysiology and Genetics of Neuron and Muscle, Lyon, France
| | - Laloé Monteiro
- Université Lyon, Université Claude Bernard Lyon 1, CNRS UMR-5261, INSERM U-1315, Institut NeuroMyoGène—Pathophysiology and Genetics of Neuron and Muscle, Lyon, France
| | - Aude Lafoux
- Therassay Platform, CAPACITES, Université de Nantes, Nantes, France
| | - Corinne Huchet
- Therassay Platform, CAPACITES, Université de Nantes, Nantes, France
- Nantes Gene Therapy Laboratory, Université de Nantes, INSERM UMR 1089, Nantes, France
| | - Enrique Jaimovich
- Centro de Estudios Moleculares de la Célula, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Christine Berthier
- Université Lyon, Université Claude Bernard Lyon 1, CNRS UMR-5261, INSERM U-1315, Institut NeuroMyoGène—Pathophysiology and Genetics of Neuron and Muscle, Lyon, France
| | - Vincent Jacquemond
- Université Lyon, Université Claude Bernard Lyon 1, CNRS UMR-5261, INSERM U-1315, Institut NeuroMyoGène—Pathophysiology and Genetics of Neuron and Muscle, Lyon, France
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