m6A甲基转移酶METTL3通过促进TRAF6依赖的线粒体ROS生产,促进了后心脏病发作后的交感性过活性
Peijin Yang1, Yu Wang2, Weili Ge3
1Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, Jinan, China; Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China.
Free radical biology & medicine
|October 28, 2023
概括
甲基转移酶类酶3 (METTL3) 通过调节对心肌梗塞 (MI) 后的m6A修饰来促进交感性过活和心律失常. 抑制METTL3可以降低氧化应激,改善心脏功能.
科学领域:
- 分子生物学分子生物学
- 心血管科学 心血管科学
- 神经科学是一个神经科学.
背景情况:
- N6-甲基氨酸 (m6A) 是一个关键的mRNA修饰.
- 甲基转移酶样酶3 (METTL3) 与心脏交感性过活性有关.
- 需要澄清METTL3在心肌梗塞 (MI) 后的副腹腔核 (PVN) 中的作用.
研究的目的:
- 调查PVN中METTL3对MI后同情活动的影响.
- 阐明METTL3在调解同情性多动和心律失常方面的潜在机制.
主要方法:
- 建立了老鼠MI模型.
- 量化了METTL3,瘤亡因子 (TNF) 受体相关因子6 (TRAF6) 和m6A水平.
- 脏交感神经活动 (RSNA),北上腺素 (NE) 水平和编程电刺激被用来评估交感活动和电稳定性.
- 在微质细胞中探索了线粒体的活性氧物种 (mROS) 生产和TRAF6/ECSIT通路.
主要成果:
- 在MI后的PVN中,METTL3表达增加.
- 抑制METTL3降低了m6A水平,TRAF6表达和mROS的产生.
- 降低METTL3减弱的交感刺激 (NE,RSNA),减少心室节律失常,改善心脏功能.
- 抑制METTL3阻止了TRAF6的线粒体转移和微质中的TRAF6/ECSIT通路激活,从而减少了mROS.
结论:
- 在PVN中,METTL3介导的m6A修饰通过TRAF6/ECSIT通路和线粒体氧化应激驱动了交感性过活性.
- 这一途径有助于心室节律失常后MI.
- 向METTL3可能为MI后并发症提供治疗策略.
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