AI662270/GRP94轴在急性心肌梗塞期间将未展开的蛋白质响应与线粒体动力学结合起来
Suling Ding1,2, Wen Liu3, Zhiwei Zhang4
1Department of Cardiology, Shanghai Institute of Cardiovascular Diseases.
JCI insight
|October 8, 2025
概括
展开的蛋白质反应 (UPR) 途径保护心脏细胞免受伤害. 这项研究揭示了葡萄糖调节蛋白94 (GRP94) 是通过调节线粒体功能在心脏病发作后减轻心脏损伤的关键因素.
科学领域:
- 心血管生物学 心血管生物学
- 分子生物学分子生物学
- 细胞应激反应的应激反应
背景情况:
- 细胞内膜网膜 (ER) 的压力触发了展开的蛋白质反应 (UPR),涉及具有保护心肌细胞免受缺血损伤的潜在作用的分子传感器.
- 心脏缺血损伤中UPR组件的精确功能和机制在很大程度上是未知的.
研究的目的:
- 研究葡萄糖调节蛋白94 (GRP94) 在心肌梗塞及其潜在机制中的作用.
- 在心脏缺血损伤的背景下,探索ER压力,GRP94和线粒体动态之间的联系.
主要方法:
- 利用心肌梗塞的小鼠模型来评估GRP94表达及其对心脏损伤的影响.
- 采用分子生物学技术,包括过度表达和缺陷研究,以阐明GRP94的功能.
- 研究了线粒体分裂,Opa1裂变和蛋白质-RNA相互作用,使用共免疫沉和LC-MS/MS.
主要成果:
- 在心脏梗塞边界区域,GRP94的表达增加;其过度表达可以防止心肌损伤,而缺乏则会加剧.
- 通过促进Opa1分裂到L-Opa1.1,GRP94减轻了缺氧诱导的线粒体分裂.
- 通过Yy1和Anxa2-Akt1信号传递,确定了一个新的调节轴 (AI662270/GRP94),将ER压力与线粒体动力学联系起来.
结论:
- AI662270/GRP94轴在调节线粒体动力学和防止缺血性心脏损伤方面发挥着至关重要的作用.
- 研究结果表明,通过GRP94调节ER压力,对心血管疾病具有潜在的治疗策略.
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