Ion Channel Dysfunctions in Dilated Cardiomyopathy in Limb-Girdle Muscular Dystrophy
Background:Limb-Girdle muscular dystrophies (LGMD) are a heritable group of genetically determined disorders with a primary involvement of the pelvic or shoulder girdle musculature with partially cardiac manifestation, such as dilated cardiomyopathy (DCM) and life-threatening tachyarrhythmia. We rep...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
15 Mar 2018
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| In: |
Circulation. Genomic and precision medicine
Year: 2018, Volume: 11, Issue: 3, Pages: 1-12 |
| ISSN: | 2574-8300 |
| DOI: | 10.1161/CIRCGEN.117.001893 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1161/CIRCGEN.117.001893 Verlag: https://www.ahajournals.org/doi/10.1161/CIRCGEN.117.001893 
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| Author Notes: | El-Battrawy Ibrahim, Zhao Zhihan, Lan Huan, Li Xin, Yücel Gökhan, Lang Siegfried, Sattler Katherine, Schünemann Jan-Dierk, Zimmermann Wolfram-Hubertus, Cyganek Lukas, Utikal Jochen, Wieland Thomas, Bieback Karen, Bauer Ralf, Ratte Antonius, Pribe-Wolferts Regina, Rapti Kleopatra, Nowak Daniel, Wittig Janina, Thomas Dierk, Most Patrick, Katus Hugo A., Ravens Ursula, Schmidt Constanze, Borggrefe Martin, Zhou Xiao-Bo, Müller Oliver J., Akin Ibrahim |
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| 245 | 1 | 0 | |a Ion Channel Dysfunctions in Dilated Cardiomyopathy in Limb-Girdle Muscular Dystrophy |c El-Battrawy Ibrahim, Zhao Zhihan, Lan Huan, Li Xin, Yücel Gökhan, Lang Siegfried, Sattler Katherine, Schünemann Jan-Dierk, Zimmermann Wolfram-Hubertus, Cyganek Lukas, Utikal Jochen, Wieland Thomas, Bieback Karen, Bauer Ralf, Ratte Antonius, Pribe-Wolferts Regina, Rapti Kleopatra, Nowak Daniel, Wittig Janina, Thomas Dierk, Most Patrick, Katus Hugo A., Ravens Ursula, Schmidt Constanze, Borggrefe Martin, Zhou Xiao-Bo, Müller Oliver J., Akin Ibrahim |
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| 520 | |a Background:Limb-Girdle muscular dystrophies (LGMD) are a heritable group of genetically determined disorders with a primary involvement of the pelvic or shoulder girdle musculature with partially cardiac manifestation, such as dilated cardiomyopathy (DCM) and life-threatening tachyarrhythmia. We report here that human induced pluripotent stem cell (hiPSC)-derived cardiomyocytes from a patient with LGMD2I and DCM associated with recurrent ventricular tachycardia displayed ion channel dysfunction and abnormality of calcium homeostasis.Methods:Dermal fibroblasts obtained from a patient with LGMD2I harboring a fukutin-related protein gene mutation (826C>A; Leu276Ile) and 3 healthy donors were reprogrammed to hiPSCs. The hiPSCs were differentiated into cardiomyocytes and used for biological and electrophysiological studies.Results:Compared with hiPSC cardiomyocytes from the healthy donors, the hiPSC cardiomyocytes from the patient exhibited abnormal action potentials characterized by reduced amplitude and upstroke velocity. The peak and late Na channel currents (INa) as well as the peak L-type calcium channel currents were significantly reduced. The expression of SCN5A and CACNA1C was reduced in DCM cardiomyocytes, consistent with reduction of INa and L-type calcium channel currents. In addition, the rapidly activating delayed rectifier potassium current (IKr) was reduced, whereas the transient outward current (Ito) and slowly activating delayed rectifier potassium current (IKs) were similar in DCM and control cardiomyocytes. Finally, a significant reduction of systolic and diastolic intracellular Ca2+ concentrations was detected in DCM cardiomyocytes.Conclusions:This study demonstrates that patient-specific hiPSC cardiomyocytes can recapitulate some phenotypic properties of LGMD2I with DCM and provide a platform for studies on the cardiac events in LGMD. | ||
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