减少TFAM的乙化促进了心脏衰竭中的生物能量功能障碍
Manling Zhang1,2,3, Ning Feng1,2,3, Zishan Peng1,2
1Vascular Medicine Institute, Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA.
iScience
|June 12, 2023
概括
氨基酸合成5-like 1 (GCN5L1) 的一般控制可以保护心脏免受压力. 失去GCN5L1会通过损害线粒体功能和减少能量产生来加剧心力衰竭.
科学领域:
- 生物化学 生物化学
- 心脏病学 心脏病学
- 线粒体生物学 线粒体生物学
背景情况:
- 氨基酸合成5-like 1 (GCN5L1) 的一般控制调节了线粒体蛋白质乙化和酶活性.
- GCN5L1在心脏对血液动力学压力的反应中的作用尚不清楚.
研究的目的:
- 研究在慢性血液动力学压力下心肌细胞中GCN5L1的功能.
- 确定GCN5L1损失对心力衰竭进展和线粒体生物能学的影响.
主要方法:
- 产生心肌细胞特异性GCN5L1淘汰 (cGCN5L1 KO) 鼠标.
- 诱导心经收缩 (TAC) 来模拟血液动力应激.
- 评估心脏功能,线粒体DNA和蛋白质水平,以及心肌细胞生物能学.
主要成果:
- 与对照组相比,cGCN5L1 KO小鼠在TAC后表现出心力衰竭恶化.
- 减少GCN5L1表达导致线粒体DNA和蛋白质水平降低,心肌细胞的生物能产量降低.
- 失去GCN5L1降低了线粒体转录因子A (TFAM) 的乙化,与线粒体DNA水平降低相关.
结论:
- GCN5L1在心脏中对血液动力学压力起着保护作用.
- GCN5L1对于维持线粒体的生物能量输出和在压力下的功能至关重要.
- GCN5L1可能通过TFAM乙化保持线粒体DNA完整性.
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