Mitochondrial Calcium Uniporter Deficiency in Zebrafish Causes Cardiomyopathy With Arrhythmia.

Mitochondrial Calcium Uniporter Deficiency in Zebrafish Causes Cardiomyopathy With Arrhythmia.
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斑马鱼线粒体钙单向转运体缺陷导致心肌病伴心律失常。

DOI:
10.3389/fphys.2020.617492
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发表时间:
2020
影响因子:
4
通讯作者:
Chen JN
Chen JN
中科院分区:
医学2区
文献类型:
--
作者:
Langenbacher AD;Shimizu H;Hsu W;Zhao Y;Borges A;Koehler C;Chen JN

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线粒体 Ca2+ 摄取影响能量产生、细胞存活和 Ca2+ 信号传导。线粒体钙单向转运蛋白 (MCU) 是线粒体基质吸收 Ca2+ 的主要途径。我们已经产生了一种斑马鱼 MCU 突变体,它可以存活到成年,并表现出类似于心肌病和窦性停搏的显着心脏表型。 MCU 心脏收缩较弱,心室较小,致密层较薄,小梁密度较低。 MCU 突变体的心室中存在受损的肌原纤维和肿胀的线粒体,以及表明细胞应激和心脏结构和功能改变的基因表达变化。通过心电图检查,我们发现 MCU 心脏显示传导系统缺陷和节律异常,停顿时间延长,类似于窦性停搏。总之,我们的研究结果表明,适当的线粒体 Ca2+ 稳态对于维持健康的成人心脏至关重要,并将 MCU 突变体建立为了解线粒体 Ca2+ 处理在成人心脏生物学中的作用的有用模型。
Mitochondrial Ca2 + uptake influences energy production, cell survival, and Ca2 + signaling. The mitochondrial calcium uniporter, MCU, is the primary route for uptake of Ca2 + into the mitochondrial matrix. We have generated a zebrafish MCU mutant that survives to adulthood and exhibits dramatic cardiac phenotypes resembling cardiomyopathy and sinus arrest. MCU hearts contract weakly and have a smaller ventricle with a thin compact layer and reduced trabecular density. Damaged myofibrils and swollen mitochondria were present in the ventricles of MCU mutants, along with gene expression changes indicative of cell stress and altered cardiac structure and function. Using electrocardiography, we found that MCU hearts display conduction system defects and abnormal rhythm, with extended pauses resembling episodes of sinus arrest. Together, our findings suggest that proper mitochondrial Ca2 + homeostasis is crucial for maintaining a healthy adult heart, and establish the MCU mutant as a useful model for understanding the role of mitochondrial Ca2 + handling in adult cardiac biology.
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