期刊
CIRCULATION RESEARCH
卷 121, 期 12, 页码 1346-+出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCRESAHA.117.311876
关键词
arrhythmogenic right ventricular dysplasia; death, sudden; desmoplakins; desmosomes; neuroglia
资金
- National Institutes of Health (NIH), National Heart, Lung, and Blood Institute [R01 HL088498, 1R01HL132401]
- Leducq Foundation [14 CVD 03]
- George and Mary Josephine Hamman Foundation
- American Heart Association Beginning Grant in Aid [15BGIA25080008]
- NIH [R01-HL089598, R01-HL091947, R01-HL117641, R41-HL129570]
- American Heart Association [13EIA14560061]
- Netherlands Organisation for Scientific Research (NWO-ZonMW) [016.166.140]
- Human Frontier Science Program Organization (HFSPO) [LT771/2015]
Rationale : Arrhythmogenic cardiomyopathy is caused primarily by mutations in genes encoding desmosome proteins. Ventricular arrhythmias are the cardinal and typically early manifestations, whereas myocardial fibroadiposis is the pathological hallmark. Homozygous DSP (desmoplakin) and JUP (junction protein plakoglobin) mutations are responsible for a subset of patients with arrhythmogenic cardiomyopathy who exhibit cardiac arrhythmias and dysfunction, palmoplanter keratosis, and hair abnormalities (cardiocutaneous syndromes). Objective: To determine phenotypic consequences of deletion of Dsp in a subset of cells common to the heart and skin. Methods and Results: Expression of CSPG4 (chondroitin sulfate proteoglycan 4) was detected in epidermal keratinocytes and the cardiac conduction system. CSPG4(pos) cells constituted approximate to 5.6 +/- 3.3% of the nonmyocyte cells in the mouse heart. Inducible postnatal deletion of Dsp under the transcriptional control of the Cspg4 locus led to ventricular arrhythmias, atrial fibrillation, atrioventricular conduction defects, and death by 4 months of age. Cardiac arrhythmias occurred early and in the absence of cardiac dysfunction and excess cardiac fibroadipocytes, as in human arrhythmogenic cardiomyopathy. The mice exhibited palmoplantar keratosis and progressive alopecia, leading to alopecia totalis, associated with accelerated proliferation and impaired terminal differentiation of keratinocytes. The phenotype is similar to human cardiocutaneous syndromes caused by homozygous mutations in DSP. Conclusions: Deletion of Dsp under the transcriptional regulation of the CSPG4 locus led to lethal cardiac arrhythmias in the absence of cardiac dysfunction or fibroadiposis, palmoplantar keratosis, and alopecia, resembling the human cardiocutaneous syndromes. The findings offer a cellular basis for early cardiac arrhythmias in patients with arrhythmogenic cardiomyopathy and cardiocutaneous syndromes.
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