升高的Na是心脏中线粒体代谢的动态和可逆调节器
Yu Jin Chung1, Zoe Hoare1, Friedrich Baark2
1School of Cardiovascular and Metabolic Medicine and Sciences, King's College, London, UK.
Nature communications
|May 20, 2024
概括
细胞内 (Nai) 的升高会破坏心脏细胞代谢,这是心力衰竭的一个关键问题. 降低Nai可以逆转这些有害的代谢变化,这表明它.
科学领域:
- 心血管生理学心血管生理学
- 线粒体的新陈代谢
- 心脏衰竭病理生理学 病理生理学
背景情况:
- 细胞内的升高 (Nai) 是心力衰竭的标志,对线粒体功能产生负面影响.
- 了解Nai诱导的代谢变化的可逆性对于开发治疗策略至关重要.
研究的目的:
- 为了研究心脏中急性诱导的代谢变化的可逆性.
- 确定潜在的治疗点,以纠正心力衰竭中的代谢功能障碍.
主要方法:
- 兰登多夫透的老鼠心脏被用来模拟急性过载.
- Na/K ATPase 抑制剂 ouabain 和肌酸脱剂 para-aminoblebbistatin 保持了恒定的能量需求.
- 通过测量ATP水解,TCA循环中间体,ETC活性和CoQ氧化还原状态来评估代谢变化.
主要成果:
- 升高的Nai降低了ATP水解,增加了糖酸盐和烟酸盐,降低了ETC活性,并转移了CoQ氧化还原状态.
- 这些代谢干扰在将Nai降低到基线水平后完全逆转.
- 伪低氧和HIF-1α稳定发生了尽管正常的氧化,并通过抑制线粒体Na/Ca交换或使用ROS清理器来预防.
结论:
- 细胞内的急性升高会导致心脏中可逆的线粒体代谢功能障碍.
- 针对线粒体的-交换或反应性氧物种可能会减轻这些影响.
- 细胞内是一种新的治疗点,用于心力衰竭中的代谢纠正.
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