Redox Biol:Grx2与高血压和心脏肥大等心脏功能障碍有关!

2017-11-15 MedSci MedSci原创

Glutaredoxin 2(GRX2)是一种线粒体谷胱甘肽依赖性氧化还原酶,维持谷胱甘肽稳态以及线粒体氧化还原,在心脏这种高代谢组织中至关重要。

机体新陈代代谢产生的过多自由基会损伤组织细胞,加快机体衰老,诱发肿瘤的产生。谷胱甘肽在人体内主要生理作用是清除掉人体内的自由基,它做为体内一种重要的抗氧化剂。Glutaredoxin 2(GRX2)是一种线粒体谷胱甘肽依赖性氧化还原酶,维持谷胱甘肽稳态以及线粒体氧化还原,在心脏这种高代谢组织中至关重要。

有研究表明,缺少GRX2会导致小鼠高血压、心脏肥大、线粒体复合体I功能受损。但GRX2对人类心肌细胞中线粒体结构和功能的影响尚不清楚。因此,研究人员推测GRX2在细胞以及小鼠模型中可能控制心脏线粒体动力学和功能,GRX2低表达与人心脏功能障碍有关。

试验结果表明,在小鼠原代心肌细胞和心脏组织中缺少GRX2会影响线粒体融合,破坏超微结构和能量代谢。向GRX2-/-小鼠模型添加谷胱甘肽前体-N-乙酰半胱氨酸(NAC)不能恢复谷胱甘肽氧化还原或预防损伤。利用人类基因型-组织表达关联分析的遗传学和组织病理学数据,证明低GRX2与左心室中的纤维化、肥大和梗塞有关。总而言之,GRX2在控制心脏线粒体结构和功能方面非常重要,并且能够预防人类心脏疾病。

原始出处:
Kanaan GN, et al. Glutaredoxin-2 controls cardiac mitochondrial dynamics and energetics in mice, and protects against human cardiac pathologies.  Redox Biol. 2017 Oct 26;14:509-521. doi: 10.1016/j.redox.2017.10.019.

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    2018-05-07 sunylz
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