DAPK2 调节PKM2 在氨酸45的酸化,以促进扰乱的流动诱导性动脉样硬化
Shuai Guo1,2, Long Xu1, Yixin Chen3
1Department of Physiology, Guangdong Key Laboratory of Vascular Diseases, Guangdong Provincial Key Laboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, China (S.G., L.X., Y. Zhao, Y. Zhang, R.Y., Y.X.).
Circulation
|January 30, 2026
概括
与死亡相关的蛋白质激酶2 (DAPK2) 通过酸化酸盐激酶M2 (PKM2) 驱动动动脉硬化,促进内皮炎症. 抑制这种DAPK2-PKM2相互作用为动脉样硬化提供了潜在的治疗策略.
科学领域:
- 心血管生物学 心血管生物学
- 动脉样硬化的分子机制
- 内皮细胞生物学 内皮细胞生物学
背景情况:
- 被振荡式剪切应力 (OSS) 所特征的血液流动受到干扰,通过不完全理解的途径,有助于动脉样硬化斑块形成.
- 内皮细胞 (EC) 激活是动脉生成的关键早期事件,受血动力学力量的影响.
- 与死亡相关的蛋白激酶2 (DAPK2) 在OSS诱导的EC激活和动脉样硬化中的作用需要阐明.
研究的目的:
- 研究DAPK2在血液流动受损的条件下对内皮细胞激活和动脉样硬化的参与.
- 确定DAPK2通过哪些分子机制影响内皮细胞对振荡剪切应力的反应.
- 探索针对DAPK2途径作为动脉样硬化治疗策略的潜力.
主要方法:
- 利用公开的基因组和转录组数据 (微阵列,RNA-seq,scRNA-seq) 来识别OSS敏感因素.
- 采用质谱,免疫沉和近距离结合测试来识别DAPK2结合蛋白和化位.
- 在动脉样硬化模型中生成和分析了Dapk2缺少和Pkm2突变的内皮细胞特异性小鼠 (动脉绑定,西方饮食).
主要成果:
- 在人类和小鼠动脉中,DAPK2的表达被OSS上调,被KLF2.2抑制.
- 特定于EC的Dapk2缺陷降低了Apoe小鼠的EC激活和动脉动脉生成.
- DAPK2在氨酸45处直接酸化酸盐激酶M2 (PKM2),通过STAT1.1促进PKM2二分化,核转位和炎症基因 (VCAM-1,ICAM-1) 的激活.
- 酸化PKM2在T45和STAT1在Y701的酸化在阿瑟罗内皮中升高.
- 过度表达一种耐性PKM2突变体 (Pkm2T45A) 缓解了因流动干扰而引起的动脉动脉发生.
结论:
- 通过DAPK2介导的PKM2在氨酸45的酸化是将血流干扰与内皮炎症反应联系起来的关键机制.
- 这个DAPK2-PKM2轴代表了动脉样硬化病变的新途径.
- 针对DAPK2驱动的PKM2酸化,为治疗动脉样硬化提供了潜在的治疗途径.
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