细胞间线粒体成分转移触发缺血性心脏纤维化
Chan Zhang1, Hao Hao2, Yishi Wang2
1Xi'an Key Laboratory of Stem Cell and Regenerative Medicine, Institute of Medical Research, Northwestern Polytechnical University, Xi'an 710072, China.
Science bulletin
|July 30, 2023
概括
心肌细胞中的小细胞外囊 (sEV) 在受伤后携带线粒体DNA,激活纤维细胞并引起心脏纤维化. Ambra1是这个过程中的关键分子,为心脏重塑提供了潜在的治疗点.
科学领域:
- 心血管生物学 心血管生物学
- 蜂通信 蜂通信
- 细胞外囊泡 细胞外囊泡
背景情况:
- 心肌纤维化是心脏突然死亡的主要原因.
- 驱动后缺血/再输 (MI/R) 纤维化的细胞间通信机制尚不清楚.
- 小型细胞外囊泡 (sEVs) 参与细胞间信号传递.
研究的目的:
- 调查心肌细胞衍生的sEVs (Myo-sEVs) 在MI/R损伤后调解心脏纤维化中的作用.
- 为了确定负责启动纤维化的Myo-sEVs中的分子组件.
- 探索Ambra1作为潜在的标记物和心脏纤维化治疗点.
主要方法:
- 建立体内和体外MI/R模型.
- 分析Myo-sEV的含量及其对纤维细胞的影响.
- 生物信息学查和Ambra的实验验证1.
- 研究Myo-sEV释放中的分泌自.
- 通过cGAS-STING通路对Ambra1在纤维细胞激活中的作用的评估.
- 对心脏特异性Ambra1下调对纤维化的影响的评估.
主要成果:
- 来自MI/R心脏的myo-sEV携带引发心肌纤维化的线粒体成分.
- Ambra1被确定为Myo-sEVs的一个关键组成部分和潜在标记物.
- Ambra1+ -Myo-sEVs通过分泌性自释放,并激活纤维细胞cGAS-STING信号传递.
- 对Ambra1的下调抑制了Myo-sEV的释放和随后的心脏纤维化.
结论:
- 心肌分泌性自调解心肌纤维化中的细胞间通信.
- Ambra1+ -Myo-sEVs将mtDNA传递给纤维细胞,促进纤维化.
- Ambra1是一种新的生物活性分子,是心脏重塑的潜在治疗标.
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