细胞外囊泡介导的器官间通信在与肥胖有关的心律失常中发挥的作用
bioRxiv : the preprint server for biology
|September 26, 2025
概括
与肥胖相关的内脏脂肪EVs破坏心脏细胞功能并促进纤维化,增加心律失常风险. 阻断心脏细胞中的TRPC3通道恢复了正常功能,确定了与肥胖有关的心脏病的关键途径.
科学领域:
- 心血管科学 心血管科学
- 代谢性疾病研究研究
- 细胞生物学 细胞生物学
背景情况:
- 肥胖是心律不整的已知危险因素之一.
- 将肥胖与心律障碍联系在一起的精确分子机制仍然不完全理解.
研究的目的:
- 研究内脏脂肪组织衍生的细胞外囊泡 (VAT EVs) 在调解与肥胖有关的心律失常中的作用.
- 为了确定治疗干预的分子标.
主要方法:
- 干细胞衍生的心肌细胞,纤维细胞和巨细胞暴露于肥胖个体的VAT EVs.
- 评估作用潜能持续时间 (APD) 和处理.
- 在肥胖小鼠体内研究以追踪EV心脏向.
- 全转录组关联研究 (TWAS) 和表观遗传分析.
- 对TRPC3通道的药理封锁.
主要成果:
- 来自肥胖个体的VAT EVs延长了APD和心肌细胞中的处理受损.
- 在纤维细胞和巨细胞中,VAT EVs诱导了亲纤维细胞和亲炎症表型.
- 在肥胖小鼠中,发现脂衍生的EV准了心脏.
- 在VAT-EV暴露后,TWAS确定了与QT间隔和心房动相关的基因.
- 心肌细胞中TRPC3通道阻塞恢复了正常的APD.
结论:
- 来自内脏脂肪组织的细胞外囊泡在肥胖症中与心脏进行直接沟通.
- 这种EV介导的途径通过改变心肌细胞功能,促进纤维化和炎症,促进了亲心律失常基质的形成.
- TRPC3代表了管理肥胖心律不整的潜在治疗标.
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