中国神经再生研究(英文版) ›› 2020, Vol. 15 ›› Issue (10): 1937-1946.doi: 10.4103/1673-5374.280325

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

Rac1减轻氧糖剥夺神经元的损伤:线粒体的生物发生和功能

  

  • 出版日期:2020-10-15 发布日期:2020-08-19
  • 基金资助:

    中国国际自然科学基金项目(81771422

Rac1 relieves neuronal injury induced by oxygenglucose deprivation and re-oxygenation via regulation of mitochondrial biogenesis and function

Ping-Ping Xia1, 2, Fan Zhang1, Cheng Chen1, Zhi-Hua Wang3, Na Wang1, Long-Yan Li1, Qu-Lian Guo1, Zhi Ye1, 2   

  1. 1 Department of Anesthesiology, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
    2 National Clinical Research Center for Geriatric Disorders, Central South University, Changsha, Hunan Province, China
    3 Department of Anesthesiology, Hainan General Hospital, Haikou, Hainan Province, China
  • Online:2020-10-15 Published:2020-08-19
  • Contact: Zhi Ye, MD, PhD,yezhi523@csu.edu.cn.
  • Supported by:
    This study was supported by the National Natural Science Foundation of China, No. 81771422 (to ZY).

摘要:

最近的研究表明,微小RNA可能在脑缺血再灌注损伤中作为神经保护因子。既往研究发现miRNA-142-3p可通过负调控Rac1的活性,参与肿瘤的发生发展以及心肌缺血性损伤,但其是否也参与脑缺血再灌注损伤,目前尚无报道。因此,实验建立原代皮质神经元氧糖剥夺模型体外模拟脑缺血再灌注损伤,转染mimir-142-3p agomir或miR-142-3p antagomir。发现氧糖剥夺后,(1)神经元中miR-142-3p表达下调。而mimir-142-3p agomir可使miR-142-3p过表达,并促进氧糖剥夺细胞死亡和凋亡,并促进线粒体生物功能相关蛋白线粒体转录因子A、过氧化物酶体增殖物激活受体γ辅激活子1α和核呼吸因子1的表达,而miR-142-3p antagomir则会产生相反的作用;(2)通过荧光素酶报告基因实验可证实,Rac1是miR-142-3p的潜在靶向基因。过表达的miR-142-3p可抑制NOX2活性,并抑制Rac1和Rac1-GTPase的表达;(3)拮抗miR-142-3p可增强上述作用;(4)结果说明,miR-142-3p下调Rac1表达和激活,调控线粒体生物发生和功能,抑制氧糖剥夺损伤,从而发挥了神经保护作用。实验于2017年3月7日经中南大学动物伦理委员会批准(No. 201703346)。

orcid: 0000-0002-7678-0926 (Zhi Ye)

关键词: 脑缺血再灌注损伤, 氧糖剥夺, miR-142-3p, Rac1, 线粒体, 生物发生, 神经保护, 微小RNA, NOX2

Abstract: Certain microRNAs (miRNAs) can function as neuroprotective factors after reperfusion/ischemia brain injury. miRNA-142-3p can participate in the occurrence and development of tumors and myocardial ischemic injury by negatively regulating the activity of Rac1, but it remains unclear whether miRNA-142-3p also participates in cerebral ischemia/reperfusion injury. In this study, a model of oxygen-glucose deprivation/re-oxygenation in primary cortical neurons was established and the neurons were transfected with miR-142-3p agomirs or miR-142-3p antagomirs. miR-142-3p expression was down-regulated in neurons when exposed to oxygen-glucose deprivation/re-oxygenation. Over-expression of miR-142-3p using its agomir remarkably promoted cell death and apoptosis induced by oxygen-glucose deprivation/re-oxygenation and improved mitochondrial biogenesis and function, including the expression of peroxisome proliferator-activated receptor-γ coactivator-1α, mitochondrial transcription factor A, and nuclear respiratory factor 1. However, the opposite effects were produced if miR-142-3p was inhibited. Luciferase reporter assays verified that Rac Family Small GTPase 1 (Rac1) was a target gene of miR- 142-3p. Over-expressed miR-142-3p inhibited NOX2 activity and expression of Rac1 and Rac1-GTPase (its activated form). miR-142-3p antagomirs had opposite effects after oxygen-glucose deprivation/re-oxygenation. Our results indicate that miR-142-3p down-regulates the expression and activation of Rac1, regulates mitochondrial biogenesis and function, and inhibits oxygen-glucose deprivation damage, thus exerting a neuroprotective effect. The experiments were approved by the Committee of Experimental Animal Use and Care of Central South University, China (approval No. 201703346) on March 7, 2017.

Key words: biogenesis, ischemia/reperfusion injury, microRNAs, miR-142-3p, mitochondria, neuroprotection, NOX2, oxygen-glucose deprivation, Rac1