多原子评价提名ER-线粒体轴和炎性巨细胞作为右前庭功能障碍的驱动因素
bioRxiv : the preprint server for biology
|April 8, 2025
概括
在肺动脉高血压中,右心房功能障碍涉及心肌细胞代谢问题和炎症. 多原子分析揭示了内分泌网膜应激和受影响的心房中的代谢受损.
科学领域:
- 心脏病学 心脏病学
- 肺高血压研究 肺高血压研究
- 多个omics的多个omics.
背景情况:
- 右心房 (RA) 功能障碍是肺动脉高血压 (PAH) 的新兴危险因素.
- 在PAH中导致RA功能受损的机制尚未得到充分研究.
- 了解RA功能障碍对于改善PAH结果至关重要.
研究的目的:
- 定义RA功能障碍的细胞和分子媒介.
- 通过对猪进行多原子分析,研究肺动脉带带 (PAB) 对RA功能的影响.
- 阐明内质网膜 (ER) 应激和代谢变化在RA功能障碍中的作用.
主要方法:
- 肺动脉带纹 (PAB) 在约克郡猪中诱导右心力衰竭.
- 心脏MRI评估了RA的大小和功能.
- 单核RNA测序 (snRNAseq) 确定了细胞特异性变化.
- 线粒体蛋白质学和代谢学分析了代谢变化.
- 诱导的多能干细胞衍生性心房心肌细胞 (iPSC-ACMs) 用于模拟ER压力.
主要成果:
- PAB导致了RA扩张,功能障碍和心房心肌细胞增大.
- 在RA中,snRNAseq揭示了炎症性巨细胞的增加和心肌细胞亚群的改变.
- 关节炎心肌细胞显示ER压力和线粒体代谢失调.
- 在功能障碍的RA中观察到受损的分支链氨基酸 (BCAA) 和脂肪酸代谢.
- 在iPSC-ACM中ER压力破坏了线粒体结构和功能.
结论:
- 多组组分析确定心肌细胞代谢障碍和ER失调是RA功能障碍的关键特征.
- 预炎性巨细胞的积累有助于PAH的RA功能障碍.
- 这些发现为PAH中RA功能障碍的机制提供了新的见解.
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