MiR-499-5P/PACS2/TRPV1轴在极端寒冷压力后保持线粒体平静和左心室功能
Renzheng Chen1,2,3, Yan Ma1,2, Sijia Chen1,2
1Geriatric Medicine Research Institute of Chinese PLA Hospital, National Clinical Research Center for Geriatric Diseases, Beijing, China.
Journal of cardiovascular translational research
|February 5, 2026
概括
极端的寒冷压力通过影响miR-499-5p和PACS2.2来损害心脏功能. 针对这种途径可以预防由寒冷引起的心脏损伤和左心室功能障碍.
科学领域:
- 心脏病学 心脏病学
- 分子生物学分子生物学
- 环境生理学环境生理学
背景情况:
- 极端寒冷压力 (ECS) 带来了重大的生理挑战,特别是损害左心室 (LV) 功能.
- 了解ECS诱导的心脏损伤背后的分子机制对于制定预防策略至关重要.
研究的目的:
- 调查miR-499-5p/PACS2/TRPV1轴在心肌细胞损伤和ECS期间LV功能障碍中的作用.
- 阐明这一轴影响线粒体功能和流量的机制.
主要方法:
- 为了模拟ECS,小鼠暴露在-20°C的温度下.
- 操纵的miR-499-5p水平 (过度表达和抑制) 和研究的酸聚类分类蛋白2 (PACS2) 表达.
- 使用心脏特异性的Pacs2敲门模型.
- 评估了LV结构和功能,线粒体细胞衰变,线粒体能量代谢,以及通过短暂受体潜在通道亚家族V成员1 (TRPV1) 的内细胞网膜-线粒体流.
主要成果:
- 中枢神经系统诱导心肌细胞损伤和 LV 功能障碍,与降低 miR-499-5p 和 PACS2 水平相关.
- 过度表达miR-499-5p进一步抑制了线粒体功能.
- 抑制miR-499-5p可以通过上调PACS2.2来逆转ECS诱导的心脏缺陷.
- 通过TRPV1.1,通过增强ER-线粒体流量来恢复心脏特异性的Pacs2正常化线粒体和能量代谢.
结论:
- miR-499-5p/PACS2/TRPV1轴是极端寒冷压力期间心脏功能障碍的关键调解器.
- 调节这个轴,特别是通过准miR-499-5p或增强PACS2,为预防感冒引起的心脏病提供了潜在的治疗策略.
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