Disruption of Abcc6 Transporter in Zebrafish Causes Ocular Calcification and Cardiac Fibrosis.

Disruption of Abcc6 Transporter in Zebrafish Causes Ocular Calcification and Cardiac Fibrosis.
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斑马鱼 Abcc6 转运蛋白的破坏导致眼钙化和心脏纤维化。

DOI:
10.3390/ijms22010278
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发表时间:
2020-12-29
影响因子:
5.6
通讯作者:
Zhong TP
Zhong TP
中科院分区:
生物学2区
文献类型:
--
作者:
Sun J;She P;Liu X;Gao B;Jin D;Zhong TP

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弹性纤维假黄瘤(Pseudoxanthoma elasticum,PXE)是由ABCC 6/MRP 6基因突变引起的一种遗传性多系统疾病。进行性的临床表现是伴随着异位矿化在各种结缔组织。然而,PXE多系统疾病的病理机制仍然不清楚,目前有效的治疗方法是可用的。在这项研究中,我们使用转录激活因子样效应核酸酶(TALEN)技术产生斑马鱼abcc 6a突变体。在年轻的成年斑马鱼中,abcc 6a在眼睛、心脏、肠和其他组织中表达。abcc 6a突变体在眼巩膜和布鲁赫膜中表现出广泛的钙化,重现了部分PXE表现。abcc 6a突变上调细胞外基质(ECM)基因,导致心脏纤维化,心肌细胞数量减少。我们发现abcc 6a突变降低了血清和各种组织中维生素K和焦磷酸盐(PPi)的水平。维生素K给药增加了基质gla蛋白(cMGP)的γ-谷氨酰羧化形式,减轻了椎骨、眼睛和心脏的异位钙化和纤维化。我们的研究结果有助于全面了解斑马鱼模型的PXE病理生理学。
Pseudoxanthoma elasticum (PXE), caused by ABCC6/MRP6 mutation, is a heritable multisystem disorder in humans. The progressive clinical manifestations of PXE are accompanied by ectopic mineralization in various connective tissues. However, the pathomechanisms underlying the PXE multisystem disorder remains obscure, and effective treatment is currently available. In this study, we generated zebrafish abcc6a mutants using the transcription activator-like effector nuclease (TALEN) technique. In young adult zebrafish, abcc6a is expressed in the eyes, heart, intestine, and other tissues. abcc6a mutants exhibit extensive calcification in the ocular sclera and Bruch’s membrane, recapitulating part of the PXE manifestations. Mutations in abcc6a upregulate extracellular matrix (ECM) genes, leading to fibrotic heart with reduced cardiomyocyte number. We found that abcc6a mutation reduced levels of both vitamin K and pyrophosphate (PPi) in the serum and diverse tissues. Vitamin K administration increased the gamma-glutamyl carboxylated form of matrix gla protein (cMGP), alleviating ectopic calcification and fibrosis in vertebrae, eyes, and hearts. Our findings contribute to a comprehensive understanding of PXE pathophysiology from zebrafish models.
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