title: Patient-specific induced pluripotent stem cells as a model for familial dilated cardiomyopathy.
abstract: Characterized by ventricular dilatation, systolic dysfunction, and progressive heart failure, dilated cardiomyopathy (DCM) is the most common form of cardiomyopathy in patients. DCM is the most common diagnosis leading to heart transplantation and places a significant burden on healthcare worldwide. The advent of induced pluripotent stem cells (iPSCs) offers an exceptional opportunity for creating disease-specific cellular models, investigating underlying mechanisms, and optimizing therapy. Here, we generated cardiomyocytes from iPSCs derived from patients in a DCM family carrying a point mutation (R173W) in the gene encoding sarcomeric protein cardiac troponin T. Compared to control healthy individuals in the same family cohort, cardiomyocytes derived from iPSCs from DCM patients exhibited altered regulation of calcium ion (Ca(2+)), decreased contractility, and abnormal distribution of sarcomeric α-actinin. When stimulated with a β-adrenergic agonist, DCM iPSC-derived cardiomyocytes showed characteristics of cellular stress such as reduced beating rates, compromised contraction, and a greater number of cells with abnormal sarcomeric α-actinin distribution. Treatment with β-adrenergic blockers or overexpression of sarcoplasmic reticulum Ca(2+) adenosine triphosphatase (Serca2a) improved the function of iPSC-derived cardiomyocytes from DCM patients. Thus, iPSC-derived cardiomyocytes from DCM patients recapitulate to some extent the morphological and functional phenotypes of DCM and may serve as a useful platform for exploring disease mechanisms and for drug screening.
authors.affiliation: Department of Medicine, Division of Cardiology, Stanford University School of Medicine, Stanford, CA 94305, USA.
authors.forename: Ning
authors.initials: N
authors.lastname: Sun
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yazawa
authors.forename: Jianwei
authors.initials: J
authors.lastname: Liu
authors.forename: Leng
authors.initials: L
authors.lastname: Han
authors.forename: Veronica
authors.initials: V
authors.lastname: Sanchez-Freire
authors.forename: Oscar J
authors.initials: OJ
authors.lastname: Abilez
authors.forename: Enrique G
authors.initials: EG
authors.lastname: Navarrete
authors.forename: Shijun
authors.initials: S
authors.lastname: Hu
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Andrew
authors.initials: A
authors.lastname: Lee
authors.forename: Aleksandra
authors.initials: A
authors.lastname: Pavlovic
authors.forename: Shin
authors.initials: S
authors.lastname: Lin
authors.forename: Rui
authors.initials: R
authors.lastname: Chen
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Hajjar
authors.forename: Michael P
authors.initials: MP
authors.lastname: Snyder
authors.forename: Ricardo E
authors.initials: RE
authors.lastname: Dolmetsch
authors.forename: Manish J
authors.initials: MJ
authors.lastname: Butte
authors.forename: Euan A
authors.initials: EA
authors.lastname: Ashley
authors.forename: Michael T
authors.initials: MT
authors.lastname: Longaker
authors.forename: Robert C
authors.initials: RC
authors.lastname: Robbins
authors.forename: Joseph C
authors.initials: JC
authors.lastname: Wu
mesh_terms: D000318:Adrenergic beta-Agonists / Q000494:pharmacology; D000319:Adrenergic beta-Antagonists / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism; D002311:Cardiomyopathy, Dilated / Q000378:metabolism* / Q000473:pathology*; D002478:Cells, Cultured; D006801:Humans; D057026:Induced Pluripotent Stem Cells / Q000187:drug effects / Q000378:metabolism*; D032383:Myocytes, Cardiac / Q000187:drug effects / Q000378:metabolism*; D053498:Sarcoplasmic Reticulum Calcium-Transporting ATPases / Q000235:genetics / Q000378:metabolism; D020107:Troponin T / Q000235:genetics / Q000378:metabolism
chemical_list: D000318:Adrenergic beta-Agonists; D000319:Adrenergic beta-Antagonists; D020107:Troponin T; D053498:Sarcoplasmic Reticulum Calcium-Transporting ATPases; D002118:Calcium