Catecholamine-dependent β-adrenergic signaling in a pluripotent stem cell model of Takotsubo cardiomyopathy
Background: Takotsubo syndrome (TTS) is characterized by an acute left ventricular dysfunction and is associated with life-threating complications in the acute phase. The underlying disease mechanism in TTS is still unknown. A genetic basis has been suggested to be involved in the pathogenesis. Obje...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
14 August 2017
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| In: |
JACC Clinical electrophysiology
Year: 2017, Jahrgang: 70, Heft: 8, Pages: 975-991 |
| ISSN: | 2405-5018 |
| DOI: | 10.1016/j.jacc.2017.06.061 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1016/j.jacc.2017.06.061 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0735109717380099 
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| Verfasserangaben: | Thomas Borchert, Daniela Hübscher, Celina I. Guessoum, Tuan-Dinh D. Lam, Jelena R. Ghadri, Isabel N. Schellinger, Malte Tiburcy, Norman Y. Liaw, Yun Li, Jan Haas, Samuel Sossalla, Mia A. Huber, Lukas Cyganek, Claudius Jacobshagen, Ralf Dressel, Uwe Raaz, Viacheslav O. Nikolaev, Kaomei Guan, Holger Thiele, Benjamin Meder, Bernd Wollnik, Wolfram-Hubertus Zimmermann, Thomas F. Lüscher, Gerd Hasenfuss, Christian Templin, Katrin Streckfuss-Bömeke |
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| 520 | |a Background: Takotsubo syndrome (TTS) is characterized by an acute left ventricular dysfunction and is associated with life-threating complications in the acute phase. The underlying disease mechanism in TTS is still unknown. A genetic basis has been suggested to be involved in the pathogenesis. Objectives: The aims of the study were to establish an in vitro induced pluripotent stem cell (iPSC) model of TTS, to test the hypothesis of altered β-adrenergic signaling in TTS iPSC-cardiomyocytes (CMs), and to explore whether genetic susceptibility underlies the pathophysiology of TTS. Methods: Somatic cells of patients with TTS and control subjects were reprogrammed to iPSCs and differentiated into CMs. Three-month-old CMs were subjected to catecholamine stimulation to simulate neurohumoral overstimulation. We investigated β-adrenergic signaling and TTS cardiomyocyte function.Results: Enhanced β-adrenergic signaling in TTS-iPSC-CMs under catecholamine-induced stress increased expression of the cardiac stress marker NR4A1; cyclic adenosine monophosphate levels; and cyclic adenosine monophosphate-dependent protein kinase A-mediated hyperphosphorylation of RYR2-S2808, PLN-S16, TNI-S23/24, and Cav1.2-S1928, and leads to a reduced calcium time to transient 50% decay. These cellular catecholamine-dependent responses were mainly mediated by β1-adrenoceptor signaling in TTS. Engineered heart muscles from TTS-iPSC-CMs showed an impaired force of contraction and a higher sensitivity to isoprenaline-stimulated inotropy compared with control subjects. In addition, altered electrical activity and increased lipid accumulation were detected in catecholamine-treated TTS-iPSC-CMs, and were confirmed by differentially expressed lipid transporters CD36 and CPT1C. Furthermore, we uncovered genetic variants in different key regulators of cardiac function.Conclusions: Enhanced β-adrenergic signaling and higher sensitivity to catecholamine-induced toxicity were identified as mechanisms associated with the TTS phenotype. (International Takotsubo Registry [InterTAK Registry] [InterTAK]; NCT01947621) | ||
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