Maturation-Based Model of Arrhythmogenic Right Ventricular Dysplasia Using Patient-Specific Induced Pluripotent Stem Cells

• Published in: Circulation Journal 2015/06/25, Vol.79(7), pp.1402-1408
• Main Authors: Wen, Jian-Yan, Wei, Chuan-Yu, Shah, Khooshbu, Wong, Johnson, Wang, Cheng, Chen, Huei-Sheng Vincent
• Format: Article
• Language: English
• Subjects: Adult; Arrhythmogenic Right Ventricular Dysplasia - genetics; Arrhythmogenic Right Ventricular Dysplasia - metabolism; Arrhythmogenic Right Ventricular Dysplasia - pathology; Cell Differentiation; Cells, Cultured; Cellular Reprogramming; Desmosomes - genetics; Fatty acid oxidation; Humans; Induced pluripotent stem cell-derived cardiomyocytes; Induced Pluripotent Stem Cells - metabolism; Induced Pluripotent Stem Cells - pathology; Metabolic maturation; Models, Cardiovascular; Mutation; Myocytes, Cardiac - metabolism; Myocytes, Cardiac - pathology; Peroxisome proliferator-activated receptor-γ; Plakophilins - genetics; PPAR alpha - metabolism; PPAR gamma - metabolism; Reactive oxygen species
• ISSN: 1346-9843; 1347-4820
• DOI: 10.1253/circj.CJ-15-0363

Cellular reprogramming of somatic cells to patient-specific induced pluripotent stem cells (iPSCs) enables in-vitro modeling of human cardiac disorders for pathogenic and therapeutic investigations. However, using iPSC-derived cardiomyocytes (iPSC-CMs) to model an adult-onset heart disease remains challenging because of the uncertainty regarding the ability of relatively immature iPSC-CMs to fully recapitulate adult disease phenotypes. Arrhythmogenic right ventricular dysplasia (ARVD) is an inherited cardiomyopathy characterized by pathological fibrofatty infiltration and cardiomyocyte (CM) loss predominantly in the right ventricle (RV), leading to heart failure and lethal arrhythmias. Over 50% of affected individuals have desmosome gene mutations, most commonly inPKP2encoding plakophilin-2. Using Yamanaka’s pluripotent factors, we generated iPSC lines from ARVD patients withPKP2mutations. We first developed a method to induce metabolic maturation of iPSC-CMs and showed that induction of adult-like metabolic energetics from an embryonic/glycolytic state is essential to model an adult-onset cardiac disease using patient-specific iPSCs. Furthermore, we showed that coactivation of normal peroxisome proliferator-activated receptor (PPAR)-α and abnormal PPARγ pathways in ARVD iPSC-CMs resulted in exaggerated CM lipogenesis, CM apoptosis, Na+channel downregulation and defective intracellular calcium handling, recapitulating the pathological signatures of ARVD. Using this model, we revealed novel pathogenic insights that metabolic derangement in an adult-like metabolic milieu underlies ARVD pathologies, enabling us to propose novel disease-modifying therapeutic strategies. (Circ J 2015; 79: 1402–1408)