一种对氧化还原依赖的途径,用于调节II类HDAC和心脏缩
Tetsuro Ago1, Tong Liu, Peiyong Zhai
1Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Newark, NJ 07103, USA.
Cell
|June 17, 2008
概括
硫素1 (Trx1) 通过修改组素脱乙酶 (HDACs) 来降低心脏缩中的氧化应激. 这种氧化还原调节阻止了HDAC的核出口,为心脏病提供了一个新的治疗点.
科学领域:
- 分子生物学分子生物学
- 心血管研究研究心血管研究
- 转毒生物学 转毒生物学
背景情况:
- 硫素1 (Trx1) 是细胞氧化还原平衡的关键调节剂,影响细胞生长和死亡.
- 心脏缩,心脏肌肉质量的增加是一个不适应的反应,往往导致心力衰竭.
- 二级组胺脱乙酶 (HDACs) 是心脏缩的关键负调节剂.
研究的目的:
- 阐明Trx1减轻心脏缩的分子机制.
- 调查氧化还原修饰在心脏缩期间调节II类HDACs中的作用.
主要方法:
- 研究了DnaJb5和II类HDACs的Trx1介导调节.
- 分析了DnaJb5和HDAC4.4中特定的氨酸残留物的氧化还原 (氧化和还原) 改性.
- 评估了这些修改对蛋白质-蛋白质相互作用和亚细胞局部化 (核出口) 的影响.
主要成果:
- Trx1对DnaJb5进行上调,并与DnaJb5和II类HDAC形成复合体.
- 在高性刺激下,Trx1可降低DnaJb5 (Cys-274/Cys-276) 和HDAC4 (Cys-667/Cys-669) 中的氧化氨酸残留物.
- 减少DnaJb5氨酸对DnaJb5-HDAC4相互作用至关重要,而减少HDAC4氨酸则抑制其核出口.
结论:
- 心脏缩是通过一种新的Trx1敏感机制调节的,该机制涉及II类HDACs的氧化还原修饰.
- 由Trx1对HDAC4的氧还原修饰调节了其核细胞质穿,影响了高信号传递.
- 这项研究揭示了一个潜在的治疗策略,针对心脏缩中的氧化还原通路.
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