Restrictive loss of plakoglobin in cardiomyocytes leads to arrhythmogenic cardiomyopathy

Deqiang Li, Ying Liu, Mitsunori Maruyama, Wuqiang Zhu, Hanying Chen, Wenjun Zhang, Sean Reuter, Shien Fong Lin, Laura S. Haneline, Loren J. Field, Peng Sheng Chen, Weinian Shou

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

Arrhythmogenic right ventricular cardiomyopathy (ARVC) is an inheritable myocardial disorder associated with fibrofatty replacement of myocardium and ventricular arrhythmia. A subset of ARVC is categorized as Naxos disease, which is characterized by ARVC and a cutaneous disorder. A homozygous loss-of-function mutation of the Plakoglobin (Jup) gene, which encodes a major component of the desmosome and the adherens junction, had been identified in Naxos patients, although the underlying mechanism remained elusive. We generated Jup mutant mice by ablating Jup in cardiomyocytes. Jup mutant mice largely recapitulated the clinical manifestation of human ARVC: ventricular dilation and aneurysm, cardiac fibrosis, cardiac dysfunction and spontaneous ventricular arrhythmias. Ultra-structural analyses revealed that desmosomes were absent in Jup mutant myocardia, whereas adherens junctions and gap junctions were preserved. We found that ventricular arrhythmias were associated with progressive cardiomyopathy and fibrosis in Jup mutant hearts. Massive cell death contributed to the cardiomyocyte dropout in Jup mutant hearts. Despite the increase of β-catenin at adherens junctions in Jup mutant cardiomyoicytes, the Wnt/β-catenin-mediated signaling was not altered. Transforming growth factor-beta-mediated signaling was found significantly elevated in Jup mutant cardiomyocytes at the early stage of cardiomyopathy, suggesting an important pathogenic pathway for Jup-related ARVC. These findings have provided further insights for the pathogenesis of ARVC and potential therapeutic interventions.

Original languageEnglish
Article numberddr392
Pages (from-to)4582-4596
Number of pages15
JournalHuman Molecular Genetics
Volume20
Issue number23
DOIs
StatePublished - Dec 2011

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    Li, D., Liu, Y., Maruyama, M., Zhu, W., Chen, H., Zhang, W., Reuter, S., Lin, S. F., Haneline, L. S., Field, L. J., Chen, P. S., & Shou, W. (2011). Restrictive loss of plakoglobin in cardiomyocytes leads to arrhythmogenic cardiomyopathy. Human Molecular Genetics, 20(23), 4582-4596. [ddr392]. https://doi.org/10.1093/hmg/ddr392