由METTL3介导的MSRB3 m6A修饰通过抑制线粒体氧化酸化加速缺氧诱导的心肌细胞铁亡
Yansong Li1, Jingwen Xia1, Yong Wei1
1Department of Cardiovasology, Luodian Hospital, Baoshan District, Shanghai 201908, China.
International immunopharmacology
|July 31, 2025
概括
氨酸硫酸减少酶B3 (MSRB3) 通过调节线粒体氧化酸化 (OXPHOS) 来保护心肌细胞免受缺氧诱导的铁亡. 抑制MSRB3 的作用
科学领域:
- 心血管生物学 心血管生物学
- 细胞生理学 细胞生理学
- 分子医学是分子医学.
背景情况:
- 慢性持续性缺氧通过铁死诱导心肌细胞死亡,这与能量供应受损和活性氧物种 (ROS) 增加有关.
- 甲二氧化硫减少酶B3 (MSRB3) 是一种关键的抗氧化酶,可以保护细胞免受氧化损伤并减少ROS.
- 缺氧引起的心肌损伤的确切分子机制和MSRB3的作用仍然不完全理解.
研究的目的:
- 调查MSRB3在调节慢性持续缺氧引起的心肌损伤中的作用.
- 阐明MSRB3在低氧压力下影响心肌细胞存活和线粒体功能的分子机制.
- 评估针对慢性缺氧引起的心脏损伤的MSRB3的治疗潜力.
主要方法:
- 在体外研究中利用暴露于缺氧的人类AC16心肌细胞,评估铁,线粒体氧化酸化 (OXPHOS) 和细胞活力.
- 在体内研究中,采用慢性持续性缺氧的小鼠模型,通过心声学和线粒体功能来评估心脏功能障碍.
- 分子分析包括西式涂抹,MeRIP-PCR,双露西法酶记者测定和RIP-PCR,以调查MSRB3.3的METTL3-介导m6A修饰.
主要成果:
- 发现MSRB3可以调节OXPHOS,影响心肌细胞活力和线粒体功能,并减轻缺氧诱导的铁亡.
- 慢性持续性缺氧被证明可以通过METTL3诱导的m6A修饰来抑制MSRB3表达.
- 抑制MSRB3 m6A修饰 (使用STM2457) 增加了MSRB3表达,增强了OXPHOS,改善了心肌细胞功能,并在体内减轻了心脏功能障碍.
结论:
- 在慢性持续性缺氧期间,MSRB3在保护心肌细胞免受铁亡的过程中发挥着至关重要的作用.
- MSRB3通过调节线粒体OXPHOS来发挥其保护作用.
- 针对MSRB3-介导的m6A修饰,为慢性缺氧诱导的心肌损伤提供了潜在的治疗策略.
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