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Hegemann N, Barth L, Döring Y, Voigt N, Grune J. Implications for neutrophils in cardiac arrhythmias. Am J Physiol Heart Circ Physiol 2024; 326:H441-H458. [PMID: 38099844 DOI: 10.1152/ajpheart.00590.2023] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 12/08/2023] [Accepted: 12/13/2023] [Indexed: 02/03/2024]
Abstract
Cardiac arrhythmias commonly occur as a result of aberrant electrical impulse formation or conduction in the myocardium. Frequently discussed triggers include underlying heart diseases such as myocardial ischemia, electrolyte imbalances, or genetic anomalies of ion channels involved in the tightly regulated cardiac action potential. Recently, the role of innate immune cells in the onset of arrhythmic events has been highlighted in numerous studies, correlating leukocyte expansion in the myocardium to increased arrhythmic burden. Here, we aim to call attention to the role of neutrophils in the pathogenesis of cardiac arrhythmias and their expansion during myocardial ischemia and infectious disease manifestation. In addition, we will elucidate molecular mechanisms associated with neutrophil activation and discuss their involvement as direct mediators of arrhythmogenicity.
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Affiliation(s)
- Niklas Hegemann
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
| | - Lukas Barth
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
| | - Yannic Döring
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (DZHK), Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (DZHK), Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Jana Grune
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
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2
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Rapöhn M, Cyganek L, Voigt N, Hasenfuß G, Lehnart SE, Wegener JW. Noninvasive analysis of contractility during identical maturations revealed two phenotypes in ventricular but not in atrial iPSC-CM. Am J Physiol Heart Circ Physiol 2024; 326:H599-H611. [PMID: 38180453 DOI: 10.1152/ajpheart.00527.2023] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 12/06/2023] [Accepted: 01/02/2024] [Indexed: 01/06/2024]
Abstract
Patient-derived induced pluripotent stem cells (iPSCs) can be differentiated into atrial and ventricular cardiomyocytes to allow for personalized drug screening. A hallmark of differentiation is the manifestation of spontaneous beating in a two-dimensional (2-D) cell culture. However, an outstanding observation is the high variability in this maturation process. We valued that contractile parameters change during differentiation serving as an indicator of maturation. Consequently, we recorded noninvasively spontaneous motion activity during the differentiation of male iPSC toward iPSC cardiomyocytes (iPSC-CMs) to further analyze similar maturated iPSC-CMs. Surprisingly, our results show that identical differentiations into ventricular iPSC-CMs are variable with respect to contractile parameters resulting in two distinct subpopulations of ventricular-like cells. In contrast, differentiation into atrial iPSC-CMs resulted in only one phenotype. We propose that the noninvasive and cost-effective recording of contractile activity during maturation using a smartphone device may help to reduce the variability in results frequently reported in studies on ventricular iPSC-CMs.NEW & NOTEWORTHY Differentiation of induced pluripotent stem cells (iPSCs) into iPSC-derived cardiomyocytes (iPSC-CMs) exhibits a high variability in mature parameters. Here, we monitored noninvasively contractile parameters of iPSC-CM during full-time differentiation using a smartphone device. Our results show that parallel maturations of iPSCs into ventricular iPSC-CMs, but not into atrial iPSC-CMs, resulted in two distinct subpopulations of iPSC-CMs. These findings suggest that our cost-effective method may help to compare iPSC-CMs at the same maturation level.
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Affiliation(s)
- Marcel Rapöhn
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
| | - Lukas Cyganek
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells," University of Göttingen, Göttingen, Germany
| | - Niels Voigt
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
- Department of Pharmacology and Toxicology, University Medical Center of Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells," University of Göttingen, Göttingen, Germany
| | - Gerd Hasenfuß
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
| | - Stephan E Lehnart
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells," University of Göttingen, Göttingen, Germany
| | - Jörg W Wegener
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
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3
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Hegemann N, Sang P, Kim JH, Koçana C, Momin N, Klages J, Kucherenko MM, Knosalla C, O'Brien B, Simmons S, Nahrendorf M, Kuebler WM, Grune J. Ultrasonographic assessment of pulmonary and Central venous congestion in experimental heart failure. Am J Physiol Heart Circ Physiol 2024; 326:H433-H440. [PMID: 38099848 DOI: 10.1152/ajpheart.00735.2023] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 12/12/2023] [Accepted: 12/12/2023] [Indexed: 01/24/2024]
Abstract
Pulmonary and systemic congestion as a consequence of heart failure are clinically recognized as alarm signals for clinical outcome and mortality. Although signs and symptoms of congestion are well detectable in patients, monitoring of congestion in small animals with heart failure lacks adequate noninvasive methodology yet. Here, we developed a novel ultrasonography-based scoring system to assess pulmonary and systemic congestion in experimental heart failure, by using lung ultrasound (LUS) and imaging of the inferior vena cava (Cava), termed CavaLUS. CavaLUS was established and tested in a rat model of supracoronary aortic banding and a mouse model of myocardial infarction, providing high sensitivity and specificity while correlating to numerous parameters of cardiac performance and disease severity. CavaLUS, therefore, provides a novel comprehensive tool for experimental heart failure in small animals to noninvasively assess congestion.NEW & NOTEWORTHY As thorough, noninvasive assessment of congestion is not available in small animals, we developed and validated an ultrasonography-based research tool to evaluate pulmonary and central venous congestion in experimental heart failure models.
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Affiliation(s)
- Niklas Hegemann
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum Der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Institute of Physiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Physiology, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
| | - Pengchao Sang
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum Der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Institute of Physiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Physiology, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
| | - Jonathan H Kim
- Institute of Physiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Physiology, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
| | - Ceren Koçana
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum Der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Institute of Physiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Physiology, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
| | - Noor Momin
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, United States
| | - Jan Klages
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Department of Cardiac Anesthesiology and Intensive Care Medicine, Deutsches Herzzentrum Der Charité, Berlin, Germany
| | - Mariya M Kucherenko
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum Der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Institute of Physiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Physiology, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
| | - Christoph Knosalla
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum Der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
| | - Benjamin O'Brien
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
- Department of Cardiac Anesthesiology and Intensive Care Medicine, Deutsches Herzzentrum Der Charité, Berlin, Germany
- William Harvey Research Institute, London, United Kingdom
| | - Szandor Simmons
- Institute of Physiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Physiology, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
| | - Matthias Nahrendorf
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, United States
| | - Wolfgang M Kuebler
- Institute of Physiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Physiology, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
| | - Jana Grune
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum Der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Institute of Physiology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Physiology, Berlin, Germany
- German Centre for Cardiovascular Research, Berlin, Germany
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, United States
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4
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Wegener JW, Mitronova GY, ElShareif L, Quentin C, Belov V, Pochechueva T, Hasenfuss G, Ackermann L, Lehnart SE. A dual-targeted drug inhibits cardiac ryanodine receptor Ca 2+ leak but activates SERCA2a Ca 2+ uptake. Life Sci Alliance 2024; 7:e202302278. [PMID: 38012000 PMCID: PMC10681910 DOI: 10.26508/lsa.202302278] [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: 07/17/2023] [Revised: 11/16/2023] [Accepted: 11/17/2023] [Indexed: 11/29/2023] Open
Abstract
In the heart, genetic or acquired mishandling of diastolic [Ca2+] by ryanodine receptor type 2 (RyR2) overactivity correlates with risks of arrhythmia and sudden cardiac death. Strategies to avoid these risks include decrease of Ca2+ release by drugs modulating RyR2 activity or increase in Ca2+ uptake by drugs modulating SR Ca2+ ATPase (SERCA2a) activity. Here, we combine these strategies by developing experimental compounds that act simultaneously on both processes. Our screening efforts identified the new 1,4-benzothiazepine derivative GM1869 as a promising compound. Consequently, we comparatively studied the effects of the known RyR2 modulators Dantrolene and S36 together with GM1869 on RyR2 and SERCA2a activity in cardiomyocytes from wild type and arrhythmia-susceptible RyR2R2474S/+ mice by confocal live-cell imaging. All drugs reduced RyR2-mediated Ca2+ spark frequency but only GM1869 accelerated SERCA2a-mediated decay of Ca2+ transients in murine and human cardiomyocytes. Our data indicate that S36 and GM1869 are more suitable than dantrolene to directly modulate RyR2 activity, especially in RyR2R2474S/+ mice. Remarkably, GM1869 may represent a new dual-acting lead compound for maintenance of diastolic [Ca2+].
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Affiliation(s)
- Jörg W Wegener
- Department of Cardiology and Pulmonology, Heart Research Center Göttingen, University Medical Center of Göttingen (UMG), Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Gyuzel Y Mitronova
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Lina ElShareif
- Department of Cardiology and Pulmonology, Heart Research Center Göttingen, University Medical Center of Göttingen (UMG), Göttingen, Germany
| | - Christine Quentin
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Vladimir Belov
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Tatiana Pochechueva
- Department of Cardiology and Pulmonology, Heart Research Center Göttingen, University Medical Center of Göttingen (UMG), Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Gerd Hasenfuss
- Department of Cardiology and Pulmonology, Heart Research Center Göttingen, University Medical Center of Göttingen (UMG), Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Lutz Ackermann
- Georg-August University of Göttingen, Institute of Organic and Biomolecular Chemistry, Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Stephan E Lehnart
- Department of Cardiology and Pulmonology, Heart Research Center Göttingen, University Medical Center of Göttingen (UMG), Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
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5
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Juan T, Bellec M, Cardoso B, Athéa H, Fukuda N, Albu M, Günther S, Looso M, Stainier DYR. Control of cardiac contractions using Cre-lox and degron strategies in zebrafish. Proc Natl Acad Sci U S A 2024; 121:e2309842121. [PMID: 38194447 PMCID: PMC10801847 DOI: 10.1073/pnas.2309842121] [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: 06/12/2023] [Accepted: 11/27/2023] [Indexed: 01/11/2024] Open
Abstract
Cardiac contractions and hemodynamic forces are essential for organ development and homeostasis. Control over cardiac contractions can be achieved pharmacologically or optogenetically. However, these approaches lack specificity or require direct access to the heart. Here, we compare two genetic approaches to control cardiac contractions by modulating the levels of the essential sarcomeric protein Tnnt2a in zebrafish. We first recombine a newly generated tnnt2a floxed allele using multiple lines expressing Cre under the control of cardiomyocyte-specific promoters, and show that it does not recapitulate the tnnt2a/silent heart mutant phenotype in embryos. We show that this lack of early cardiac contraction defects is due, at least in part, to the long half-life of tnnt2a mRNA, which masks the gene deletion effects until the early larval stages. We then generate an endogenous Tnnt2a-eGFP fusion line that we use together with the zGRAD system to efficiently degrade Tnnt2a in all cardiomyocytes. Using single-cell transcriptomics, we find that Tnnt2a depletion leads to cardiac phenotypes similar to those observed in tnnt2a mutants, with a loss of blood and pericardial flow-dependent cell types. Furthermore, we achieve conditional degradation of Tnnt2a-eGFP by splitting the zGRAD protein into two fragments that, when combined with the cpFRB2-FKBP system, can be reassembled upon rapamycin treatment. Thus, this Tnnt2a degradation line enables non-invasive control of cardiac contractions with high spatial and temporal specificity and will help further understand how they shape organ development and homeostasis.
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Affiliation(s)
- Thomas Juan
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim61231, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz- Kreislaufforschung), Bad Nauheim61231, Germany
- Cardio-Pulmonary Institute, Bad Nauheim61231, Germany
| | - Maëlle Bellec
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim61231, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz- Kreislaufforschung), Bad Nauheim61231, Germany
| | - Bárbara Cardoso
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim61231, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz- Kreislaufforschung), Bad Nauheim61231, Germany
| | - Héloïse Athéa
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim61231, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz- Kreislaufforschung), Bad Nauheim61231, Germany
| | - Nana Fukuda
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim61231, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz- Kreislaufforschung), Bad Nauheim61231, Germany
| | - Marga Albu
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim61231, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz- Kreislaufforschung), Bad Nauheim61231, Germany
| | - Stefan Günther
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz- Kreislaufforschung), Bad Nauheim61231, Germany
- Cardio-Pulmonary Institute, Bad Nauheim61231, Germany
- Bioinformatics and Deep Sequencing Platform, Max Planck Institute for Heart and Lung Research, Bad Nauheim61231, Germany
| | - Mario Looso
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz- Kreislaufforschung), Bad Nauheim61231, Germany
- Cardio-Pulmonary Institute, Bad Nauheim61231, Germany
- Bioinformatics Core Unit, Max Planck Institute for Heart and Lung Research, Bad Nauheim61231, Germany
| | - Didier Y. R. Stainier
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim61231, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz- Kreislaufforschung), Bad Nauheim61231, Germany
- Cardio-Pulmonary Institute, Bad Nauheim61231, Germany
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6
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Giroud M, Kotschi S, Kwon Y, Le Thuc O, Hoffmann A, Gil‐Lozano M, Karbiener M, Higareda‐Almaraz JC, Khani S, Tews D, Fischer‐Posovszky P, Sun W, Dong H, Ghosh A, Wolfrum C, Wabitsch M, Virtanen KA, Blüher M, Nielsen S, Zeigerer A, García‐Cáceres C, Scheideler M, Herzig S, Bartelt A. The obesity-linked human lncRNA AATBC stimulates mitochondrial function in adipocytes. EMBO Rep 2023; 24:e57600. [PMID: 37671834 PMCID: PMC10561178 DOI: 10.15252/embr.202357600] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 07/31/2023] [Accepted: 08/10/2023] [Indexed: 09/07/2023] Open
Abstract
Adipocytes are critical regulators of metabolism and energy balance. While white adipocyte dysfunction is a hallmark of obesity-associated disorders, thermogenic adipocytes are linked to cardiometabolic health. As adipocytes dynamically adapt to environmental cues by functionally switching between white and thermogenic phenotypes, a molecular understanding of this plasticity could help improving metabolism. Here, we show that the lncRNA Apoptosis associated transcript in bladder cancer (AATBC) is a human-specific regulator of adipocyte plasticity. Comparing transcriptional profiles of human adipose tissues and cultured adipocytes we discovered that AATBC was enriched in thermogenic conditions. Using primary and immortalized human adipocytes we found that AATBC enhanced the thermogenic phenotype, which was linked to increased respiration and a more fragmented mitochondrial network. Expression of AATBC in adipose tissue of mice led to lower plasma leptin levels. Interestingly, this association was also present in human subjects, as AATBC in adipose tissue was inversely correlated with plasma leptin levels, BMI, and other measures of metabolic health. In conclusion, AATBC is a novel obesity-linked regulator of adipocyte plasticity and mitochondrial function in humans.
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Affiliation(s)
- Maude Giroud
- Institute for Diabetes and CancerHelmholtz Center MunichNeuherbergGermany
- German Center for Diabetes ResearchNeuherbergGermany
- Joint Heidelberg‐IDC Translational Diabetes Program, Inner Medicine 1Heidelberg University HospitalHeidelbergGermany
- Institute for Cardiovascular Prevention, Faculty of MedicineLudwig‐Maximilians‐UniversityMunichGermany
| | - Stefan Kotschi
- Institute for Cardiovascular Prevention, Faculty of MedicineLudwig‐Maximilians‐UniversityMunichGermany
| | - Yun Kwon
- Institute for Diabetes and CancerHelmholtz Center MunichNeuherbergGermany
- German Center for Diabetes ResearchNeuherbergGermany
- Joint Heidelberg‐IDC Translational Diabetes Program, Inner Medicine 1Heidelberg University HospitalHeidelbergGermany
| | - Ophélia Le Thuc
- Institute for Diabetes and ObesityHelmholtz Center MunichNeuherbergGermany
| | - Anne Hoffmann
- Helmholtz Institute for Metabolic, Obesity and Vascular Research of the Helmholtz Zentrum München at the University of Leipzig and University Hospital LeipzigLeipzigGermany
| | - Manuel Gil‐Lozano
- Institute for Diabetes and CancerHelmholtz Center MunichNeuherbergGermany
- German Center for Diabetes ResearchNeuherbergGermany
- Joint Heidelberg‐IDC Translational Diabetes Program, Inner Medicine 1Heidelberg University HospitalHeidelbergGermany
| | | | - Juan Carlos Higareda‐Almaraz
- Institute for Diabetes and CancerHelmholtz Center MunichNeuherbergGermany
- German Center for Diabetes ResearchNeuherbergGermany
- Joint Heidelberg‐IDC Translational Diabetes Program, Inner Medicine 1Heidelberg University HospitalHeidelbergGermany
| | - Sajjad Khani
- Institute for Diabetes and CancerHelmholtz Center MunichNeuherbergGermany
- Institute for Cardiovascular Prevention, Faculty of MedicineLudwig‐Maximilians‐UniversityMunichGermany
| | - Daniel Tews
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent MedicineUlm University Medical CenterUlmGermany
| | - Pamela Fischer‐Posovszky
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent MedicineUlm University Medical CenterUlmGermany
| | - Wenfei Sun
- Institute of Food, Nutrition and HealthETH ZürichSchwerzenbachSwitzerland
| | - Hua Dong
- Institute of Food, Nutrition and HealthETH ZürichSchwerzenbachSwitzerland
| | - Adhideb Ghosh
- Institute of Food, Nutrition and HealthETH ZürichSchwerzenbachSwitzerland
| | - Christian Wolfrum
- Institute of Food, Nutrition and HealthETH ZürichSchwerzenbachSwitzerland
| | - Martin Wabitsch
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent MedicineUlm University Medical CenterUlmGermany
| | | | - Matthias Blüher
- Helmholtz Institute for Metabolic, Obesity and Vascular Research of the Helmholtz Zentrum München at the University of Leipzig and University Hospital LeipzigLeipzigGermany
- Medical Department III – Endocrinology, Nephrology, RheumatologyUniversity of Leipzig Medical CenterLeipzigGermany
| | - Søren Nielsen
- The Centre of Inflammation and Metabolism and the Centre for Physical Activity Research, RigshospitaletUniversity of CopenhagenCopenhagenDenmark
| | - Anja Zeigerer
- Institute for Diabetes and CancerHelmholtz Center MunichNeuherbergGermany
- German Center for Diabetes ResearchNeuherbergGermany
- Joint Heidelberg‐IDC Translational Diabetes Program, Inner Medicine 1Heidelberg University HospitalHeidelbergGermany
| | - Cristina García‐Cáceres
- German Center for Diabetes ResearchNeuherbergGermany
- Institute for Diabetes and ObesityHelmholtz Center MunichNeuherbergGermany
- Medizinische Klinik and Poliklinik IV, Klinikum der UniversitätLudwig‐Maximilians‐Universität MünchenMunichGermany
| | - Marcel Scheideler
- Institute for Diabetes and CancerHelmholtz Center MunichNeuherbergGermany
- German Center for Diabetes ResearchNeuherbergGermany
- Joint Heidelberg‐IDC Translational Diabetes Program, Inner Medicine 1Heidelberg University HospitalHeidelbergGermany
| | - Stephan Herzig
- Institute for Diabetes and CancerHelmholtz Center MunichNeuherbergGermany
- German Center for Diabetes ResearchNeuherbergGermany
- Joint Heidelberg‐IDC Translational Diabetes Program, Inner Medicine 1Heidelberg University HospitalHeidelbergGermany
- Chair Molecular Metabolic ControlTechnical University MunichMunichGermany
| | - Alexander Bartelt
- Institute for Diabetes and CancerHelmholtz Center MunichNeuherbergGermany
- Institute for Cardiovascular Prevention, Faculty of MedicineLudwig‐Maximilians‐UniversityMunichGermany
- German Center for Cardiovascular Research, Partner Site Munich Heart AllianceLudwig‐Maximilians‐UniversityMunichGermany
- Department of Molecular Metabolism & Sabri Ülker CenterHarvard T.H. Chan School of Public HealthBostonMAUSA
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7
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Hofmann C, Löwenthal Z, Aghajani M, Kaufman RJ, Katus HA, Frey N, Glembotski CC, Völkers M, Doroudgar S. mTORC1 inhibition impairs activation of the unfolded protein response and induces cell death during ER stress in cardiomyocytes. Am J Physiol Heart Circ Physiol 2023. [PMID: 37294892 PMCID: PMC10393365 DOI: 10.1152/ajpheart.00682.2022] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 06/02/2023] [Indexed: 06/11/2023]
Abstract
The mechanistic target of rapamycin complex 1 (mTORC1) is a central regulator of protein synthesis that senses and responds to a variety of stimuli to coordinate cellular metabolism with environmental conditions. To ensure that protein synthesis is inhibited during unfavorable conditions, translation is directly coupled to the sensing of cellular protein homeostasis. Thus, translation is attenuated during endoplasmic reticulum (ER) stress by direct inhibition of the mTORC1 pathway. However, residual mTORC1 activity is maintained during prolonged ER stress which is thought to be involved in translational reprogramming and adaption to ER stress. By analyzing the dynamics of mTORC1 regulation during ER stress, we unexpectedly found that mTORC1 is transiently activated in cardiomyocytes within minutes at the onset of ER stress before being inhibited during chronic ER stress. This dynamic regulation of mTORC1 appears to be mediated, at least in part, by ATF6, as its activation was sufficient to induce the biphasic control of mTORC1. We further showed that protein synthesis remains dependent on mTORC1 throughout the ER stress response and that mTORC1 activity is essential for posttranscriptional induction of several unfolded protein response elements. Pharmacological inhibition of mTORC1 increased cell death during ER stress, indicating that the mTORC1 pathway serves adaptive functions during ER stress in cardiomyocytes potentially by controlling the expression of the protective unfolded protein response.
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Affiliation(s)
- Christoph Hofmann
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany
- SDSU Heart Institute and Department of Biology, San Diego State University, San Diego, CA, United States
- Faculty of Biosciences, Heidelberg University, Heidelberg, Germany
| | - Zoe Löwenthal
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany
| | - Marjan Aghajani
- Department of Internal Medicine and the Translational Cardiovascular Research Center, University of Arizona College of Medicine, Phoenix, AZ, United States
| | - Randal J Kaufman
- Degenerative Diseases Program, Center for Genetic Disorders and Aging Research, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Hugo A Katus
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany
| | - Norbert Frey
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany
| | - Christopher C Glembotski
- SDSU Heart Institute and Department of Biology, San Diego State University, San Diego, CA, United States
- Faculty of Biosciences, Heidelberg University, Heidelberg, Germany
| | - Mirko Völkers
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany
| | - Shirin Doroudgar
- Department of Internal Medicine III (Cardiology, Angiology, and Pneumology), Heidelberg University Hospital, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Heidelberg, Germany
- Faculty of Biosciences, Heidelberg University, Heidelberg, Germany
- Department of Internal Medicine and the Translational Cardiovascular Research Center, University of Arizona College of Medicine, Phoenix, AZ, United States
- Degenerative Diseases Program, Center for Genetic Disorders and Aging Research, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
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Kiweler M, Looso M, Graumann J. MARMoSET - Extracting Publication-ready Mass Spectrometry Metadata from RAW Files. Mol Cell Proteomics 2019; 18:1700-1702. [PMID: 31097673 PMCID: PMC6683000 DOI: 10.1074/mcp.tir119.001505] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 05/07/2019] [Indexed: 11/06/2022] Open
Abstract
In the context of publishing data sets acquired by mass spectrometry or works based on such molecular screens, metadata documenting the instrument settings are of central importance to the evaluation and reproduction of results. A single experiment may be linked to hundreds of data acquisitions, which are frequently stored in proprietary file formats. Together with community-, repository-, as well as publisher-specific reporting standards, this state of affairs frequently leads to manual -and thus error prone-metadata extraction and formatting. Data extracted from a single file also often stand in for an entire file set, implying a risk for unreported parameter divergence. To support quality control and data reporting, the C# application MARMoSET extracts and reduces publication relevant metadata from Thermo Fischer Scientific RAW files. It is integrated with an R package for easy reporting. The tool is expected to be particularly useful to high throughput environments such as service facilities with large project numbers and/or sizes.
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Affiliation(s)
- Marina Kiweler
- Bioinformatics Core Unit, Max Planck Institute for Heart and Lung Research, W.G. Kerckhoff Institute, Ludwigstr. 43, Bad Nauheim, Germany
| | - Mario Looso
- Bioinformatics Core Unit, Max Planck Institute for Heart and Lung Research, W.G. Kerckhoff Institute, Ludwigstr. 43, Bad Nauheim, Germany; The German Center for Cardiovascular Research (DZHK), Partner Site Rhine-Main.
| | - Johannes Graumann
- Scientific Service Group Biomolecular Mass Spectrometry, Max Planck Institute for Heart and Lung Research, W.G. Kerckhoff Institute, Ludwigstr. 43, Bad Nauheim, Germany; The German Center for Cardiovascular Research (DZHK), Partner Site Rhine-Main.
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