Identification of a New Modulator of the Intercalated Disc in a Zebrafish Model of Arrhythmogenic Cardiomyopathy

被引:180
作者
Asimaki, Angeliki [1 ,2 ]
Kapoor, Sudhir [1 ,2 ]
Plovie, Eva [3 ,4 ,5 ]
Arndt, Anne Karin [3 ,4 ,5 ]
Adams, Edward [3 ,4 ,5 ]
Liu, ZhenZhen [3 ,4 ,5 ]
James, Cynthia A. [6 ]
Judge, Daniel P. [6 ]
Calkins, Hugh [6 ]
Churko, Jared [7 ,8 ]
Wu, Joseph C. [7 ,8 ]
MacRae, Calum A. [3 ,4 ,5 ]
Kleber, Andre G. [1 ,2 ]
Saffitz, Jeffrey E. [1 ,2 ]
机构
[1] Beth Israel Deaconess Med Ctr, Dept Pathol, Boston, MA 02215 USA
[2] Harvard Univ, Sch Med, Boston, MA 02215 USA
[3] Brigham & Womens Hosp, Dept Med, Boston, MA 02215 USA
[4] Harvard Univ, Sch Med, Harvard Stem Cell Inst, Boston, MA 02215 USA
[5] Broad Inst Harvard & MIT, Boston, MA 02115 USA
[6] Johns Hopkins Univ, Div Cardiol, Dept Med, Baltimore, MD 21287 USA
[7] Stanford Univ, Sch Med, Stanford Cardiovasc Inst, Dept Med, Stanford, CA 94305 USA
[8] Stanford Univ, Sch Med, Inst Stem Cell Biol & Regenerat Med, Dept Radiol, Stanford, CA 94305 USA
关键词
RIGHT-VENTRICULAR CARDIOMYOPATHY; CARDIAC SODIUM-CHANNEL; NAXOS-DISEASE; GAP-JUNCTIONS; PLAKOGLOBIN; MYOCYTES; EXPRESSION; DESMOSOMES; CONNEXIN43; PATHWAYS;
D O I
10.1126/scitranslmed.3008008
中图分类号
Q2 [细胞生物学];
学科分类号
071013 [干细胞生物学];
摘要
Arrhythmogenic cardiomyopathy (ACM) is characterized by frequent cardiac arrhythmias. To elucidate the underlying mechanisms and discover potential chemical modifiers, we created a zebrafish model of ACM with cardiac myocyte-specific expression of the human 2057del2 mutation in the gene encoding plakoglobin. A high-throughput screen identified SB216763 as a suppressor of the disease phenotype. Early SB216763 therapy prevented heart failure and reduced mortality in the fish model. Zebrafish ventricular myocytes that expressed 2057del2 plakoglobin exhibited 70 to 80% reductions in I-Na and I-K1 current densities, which were normalized by SB216763. Neonatal rat ventricular myocytes that expressed 2057del2 plakoglobin recapitulated pathobiological features seen in patients with ACM, all of which were reversed or prevented by SB216763. The reverse remodeling observed with SB216763 involved marked subcellular redistribution of plakoglobin, connexin 43, and Nav1.5, but without changes in their total cellular content, implicating a defect in protein trafficking to intercalated discs. In further support of this mechanism, we observed SB216763-reversible, abnormal subcellular distribution of SAP97 (a protein known to mediate forward trafficking of Nav1.5 and Kir2.1) in rat cardiac myocytes expressing 2057del2 plakoglobin and in cardiac myocytes derived from induced pluripotent stem cells from two ACM probands with plakophilin-2 mutations. These observations pinpoint aberrant trafficking of intercalated disc proteins as a central mechanism in ACM myocyte injury and electrical abnormalities.
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页数:15
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