中国神经再生研究(英文版) ›› 2023, Vol. 18 ›› Issue (10): 2237-2245.doi: 10.4103/1673-5374.369115

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

Hoxa5启动子组蛋白乙酰化修饰抑制急性缺血性脑卒中神经元凋亡

  

  • 出版日期:2023-10-15 发布日期:2023-03-28
  • 基金资助:
    辽宁省自然科学基金项目(2021-MS-061)

The circular RNA Rap1b promotes Hoxa5 transcription by recruiting Kat7 and leading to increased Fam3a expression, which inhibits neuronal apoptosis in acute ischemic stroke

Fang-Fang Zhang#, Liang Zhang*, #, Lin Zhao#, Yu Lu, Xin Dong, Yan-Qi Liu, Yu Li, Shuang Guo, Si-Yuan Zheng, Ying Xiao, Yu-Zhu Jiang   

  1. Department of Rehabilitation Medicine, The People’s Hospital of China Medical University (The People’s Hospital of Liaoning Province), Shenyang, Liaoning Province, China
  • Online:2023-10-15 Published:2023-03-28
  • Contact: Liang Zhang, MS, bafeng4242@163.com or 464473517@qq.com.
  • Supported by:
    This work was supported by the Natural Science Foundation of Liaoning Province, No. 2021-MS-061 (to LZhang)

摘要:

环状RNA可参与调控缺血性脑血管病的发生和进展,但是是否也对急性缺血性脑卒中有作用,目前尚不可知。为探索circRap1b对急性缺血性脑卒中的作用,实验分别建立了氧糖剥夺HT22细胞建立体外急性缺血缺氧模型以及右侧颈动脉闭塞急性缺血缺氧小鼠模型。结果发现,circRap1b在急性缺血缺氧小鼠海马以及HT22细胞中均显著下调,而过表达circR ap1b能有效抑制急性缺血缺氧损伤HT22细胞的凋亡。同时circRap1b/Hoxa5在体外抑制神经元凋亡可能归因于Kat7诱导的Hoxa5启动子区组蛋白H3赖氨酸14乙酰化修饰。这一结果说明了环状RNA Rap1b抑制急性缺血性卒中神经元凋亡的机制。

https://orcid.org/0000-0003-0604-8307 (Liang Zhang)

关键词: 环状RNA, circRap1b, 脑卒中, 缺血, 缺氧, 表观遗传学, 乙酰化, 组蛋白修饰, 神经元, 细胞凋亡

Abstract: Circular RNAs can regulate the development and progression of ischemic cerebral disease. However, it remains unclear whether they play a role in acute ischemic stroke. To investigate the role of the circular RNA Rap1b (circRap1b) in acute ischemic stroke, in this study we established an in vitro model of acute ischemia and hypoxia by subjecting HT22 cells to oxygen and glucose deprivation and a mouse model of acute ischemia and hypoxia by occluding the right carotid artery. We found that circRap1b expression was remarkably down-regulated in the hippocampal tissue of the mouse model and in the HT22 cell model. In addition, Hoxa5 expression was strongly up-regulated in response to circRap1b overexpression. Hoxa5 expression was low in the hippocampus of a mouse model of acute ischemia and in HT22-AIS cells, and inhibited HT22-AIS cell apoptosis. Importantly, we found that circRap1b promoted Hoxa5 transcription by recruiting the acetyltransferase Kat7 to induce H3K14ac modification in the Hoxa5 promoter region. Hoxa5 regulated neuronal apoptosis by activating transcription of Fam3a, a neuronal apoptosis-related protein. These results suggest that circRap1b regulates Hoxa5 transcription and expression, and subsequently Fam3a expression, ultimately inhibiting cell apoptosis. Lastly, we explored the potential clinical relevance of circRap1b and Hoxa5 in vivo. Taken together, these findings demonstrate the mechanism by which circRap1b inhibits neuronal apoptosis in acute ischemic stroke.

Key words: acetylation, apoptosis, circRap1b, circRNAs, epigenetics, histone modification, hypoxia, ischemia, neurons, stroke