在PM2.5引起的肺损伤中,METTL3驱动的m6A修改编排了依赖于线粒细胞的铁亡
Qin Ran1,2, Jie Gao1,2, Guoping Li1,2
1Laboratory of Allergy and Precision Medicine, Affiliated Hospital of Southwest Jiaotong University, Chengdu Institute of Respiratory Health, the Third People's Hospital of Chengdu, Chengdu, China.
Frontiers in immunology
|October 27, 2025
概括
空气污染 (PM2.5) 通过增强N6-甲基氨酸 (m6A) 修饰引起肺损伤,从而驱动线粒和铁亡. METTL3酶调节这种通路,为呼吸系统疾病提供潜在的治疗点.
科学领域:
- 环境健康 环境健康
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 空气污染,特别是细颗粒物 (PM2.5),是导致呼吸系统疾病的主要原因.
- 由于PM2.5引起的肺损伤的精确分子机制尚未完全理解.
- 表观遗传修饰,如N6-甲基氨酸 (m6A),越来越多地被认为在细胞对环境压力因素的反应中的作用.
研究的目的:
- 研究m6A甲基转移酶METTL3在PM2.5引起的肺损伤中的作用.
- 为了阐明在暴露于PM2.5.5.的支气管上皮细胞中依赖于线粒细胞衰变的铁亡的参与.
- 确定PM2.5相关的呼吸道疾病的潜在治疗点.
主要方法:
- 使用了PM2.5暴露的体外细胞培养和体内小鼠模型.
- 执行了METTL3.3的功能获取和功能丧失实验.
- 分析了组织学变化,细胞活力,炎症标记物和与铁亡相关的蛋白质.
- 研究了PINK1mRNA的m6A修饰及其对线粒的影响.
主要成果:
- 暴露于PM2.5引起了肺组织损伤,炎症,以及支气管上皮细胞中铁和线粒的增加.
- 过度表达METTL3加剧了PM2.5引起的肺损伤,而METTL3沉默提供了保护.
- PM2.5上调调节了METTL3,通过m6A修饰稳定了PINK1mRNA,激活了mitophagy并导致铁亡.
- 抑制线粒细胞衰减的PM2.5诱导的肺损伤和铁亡.
结论:
- 一个新的调节轴m6A-mitophagy-ferroptosis驱动PM2.5诱导的肺损伤.
- 在这种途径中,METTL3介导的m6A修饰起着至关重要的作用.
- 针对METTL3介导的m6A修饰和线粒细胞衰变,为PM2.5相关的呼吸道疾病提供了一个有前途的治疗策略.
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