中国神经再生研究(英文版) ›› 2023, Vol. 18 ›› Issue (8): 1743-1749.doi: 10.4103/1673-5374.363836

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

内皮细胞丝裂原活化蛋白激酶磷酸酶1活化能保护改善缺血性脑卒中血脑屏障

  

  • 出版日期:2023-08-15 发布日期:2023-02-23
  • 基金资助:
    深圳市中医医院科研启动基金项目(2021-07)。深圳市三名医学项目(SZZYSM 202111011),浙江省-嘉兴市关节疼痛医学重点学科(2019-ss-ttyx号),嘉兴神经与疼痛医学重点实验室项目([2014]81号)

Overexpression of mitogen-activated protein kinase phosphatase-1 in endothelial cells reduces blood-brain barrier injury in a mouse model of ischemic stroke

Xiu-De Qin1, Tai-Qin Yang1, Jing-Hui Zeng2, Hao-Bin Cai1, Shao-Hua Qi3, Jian-Jun Jiang4, Ying Cheng2, Long-Sheng Xu5, *, Fan Bu1, *   

  1. 1Department of Neurology & Psychology, Shenzhen Traditional Chinese Medicine Hospital, The Fourth Clinical Medical College of Guangzhou University of Chinese Medicine, Shenzhen, Guangdong Province, China; 2Department of Cardiothoracic Surgery, Shenzhen Traditional Chinese Medicine Hospital, The Fourth Clinical Medical College of Guangzhou University of Chinese Medicine, Shenzhen, Guangdong Province, China; 3Department of Neurology, The University of Texas Health Science Center at Houston, Houston, TX, USA; 4Department of Nephrology, Shenzhen Traditional Chinese Medicine Hospital, The Fourth Clinical Medical College of Guangzhou University of Chinese Medicine, Shenzhen, Guangdong Province, China; 5Department of Anesthesiology and Pain Medicine, The Affiliated Hospital of Jiaxing University, Jiaxing, Zhejiang Province, China
  • Online:2023-08-15 Published:2023-02-23
  • Contact: Fan Bu, PhD, fanbu123@outlook.com; Long-Sheng Xu, MS, xlsh2468@163.com.
  • Supported by:
    This study was supported by Research Start-up Funding of Shenzhen Traditional Chinese Medicine Hospital, No. 2021-07 (to FB), Sanming Project of Medicine in Shenzhen, No. SZZYSM 202111011 (to XDQ and FB), Key Discipline Established by Zhejiang Province, Jiaxing City Jointly-Pain Medicine, No. 2019-ss-ttyx (to LSX), and Jiaxing Key Laboratory of Neurology and Pain Medicine, No. [2014]81 (to LSX).

摘要:

缺血性脑卒中能够引起血脑屏障损伤,并使脑损伤加重。内皮细胞的紧密连接蛋白表达分布异常可增加细胞间隙和血脑屏障通透性,即促进血脑屏障缺失。而选择性抑制丝裂原活化蛋白激酶能够改善内皮细胞紧密连接功能,而敲除丝裂原活化蛋白激酶磷酸酶1则能够加重小鼠缺血性脑损伤,然而后者是否影响血脑屏障完整性和细胞特异性机制尚不明确。实验对成年雄性小鼠行60min短暂大脑中动脉闭塞以模拟缺血性脑卒中,并在损伤前在损伤侧以慢病毒转染方式过表达内皮细胞丝裂原活化蛋白激酶磷酸酶1。结果发现,过表达内皮细胞丝裂原活化蛋白激酶磷酸酶1可缩小缺血性脑卒中小鼠的脑梗死体积,抑制脑组织中炎性因子白细胞介素1β、白细胞介素6和趋化因子配体2水平,抑制血管损伤,并促进感觉运动和认知记忆功能的恢复。同时过表达内皮细胞丝裂原活化蛋白激酶磷酸酶1还能抑制脑缺血诱导的细胞外调节蛋白激酶1/2的活化以及occludin蛋白表达下调。最后,为研究内皮细胞丝裂原活化蛋白激酶磷酸酶1的作用机制,利用原代内皮细胞建立细胞单层屏障,予以氧糖剥夺刺激,以在体外模拟缺血性脑卒中,并以药理学抑制丝裂原活化蛋白激酶磷酸酶1和其负调控底物细胞外调节蛋白激酶1/2的活性。可见丝裂原活化蛋白激酶磷酸酶1抑制剂会加重氧糖剥夺诱导的细胞死亡和细胞单层渗漏以及闭塞素表达下调,而细胞外调节蛋白激酶1/2抑制剂则能起到相反作用。此外,丝裂原活化蛋白激酶磷酸酶1和细胞外调节蛋白激酶1/2抑制剂联合作用的效果与单独细胞外调节蛋白激酶1/2抑制剂的作用效果接近。表明内皮细胞丝裂原活化蛋白激酶磷酸酶1活化能够负调节细胞外调节蛋白激酶1/2对紧密连接以及occludin表达的作用,进而保护血脑屏障完整性,以减轻脑损伤并促进脑卒中预后。

https://orcid.org/0000-0002-0051-6037 (Fan Bu); https://orcid.org/0000-0002-6091-6323 (Long-Sheng Xu)

关键词: 血脑屏障, 脑损伤, 脑缺血, 内皮细胞, 细胞外调节蛋白激酶1/2, 功能恢复, 丝裂原活化蛋白激酶磷酸酶1, occludin, 氧糖剥夺, 暂时性大脑中动脉阻塞

Abstract: Ischemic stroke can cause blood-brain barrier (BBB) injury, which worsens brain damage induced by stroke. Abnormal expression of tight junction proteins in endothelial cells (ECs) can increase intracellular space and BBB leakage. Selective inhibition of mitogen-activated protein kinase, the negative regulatory substrate of mitogen-activated protein kinase phosphatase (MKP)-1, improves tight junction protein function in ECs, and genetic deletion of MKP-1 aggravates ischemic brain injury. However, whether the latter affects BBB integrity, and the cell type-specific mechanism underlying this process, remain unclear. In this study, we established an adult male mouse model of ischemic stroke by occluding the middle cerebral artery for 60 minutes and overexpressed MKP-1 in ECs on the injured side via lentiviral transfection before stroke. We found that overexpression of MKP-1 in ECs reduced infarct volume, reduced the level of inflammatory factors interleukin-1β, interleukin-6, and chemokine C-C motif ligand-2, inhibited vascular injury, and promoted the recovery of sensorimotor and memory/cognitive function. Overexpression of MKP-1 in ECs also inhibited the activation of cerebral ischemia-induced extracellular signal-regulated kinase (ERK) 1/2 and the downregulation of occludin expression. Finally, to investigate the mechanism by which MKP-1 exerted these functions in ECs, we established an ischemic stroke model in vitro by depriving the primary endothelial cell of oxygen and glucose, and pharmacologically inhibited the activity of MKP-1 and ERK1/2. Our findings suggest that MKP-1 inhibition aggravates oxygen and glucose deprivation-induced cell death, cell monolayer leakage, and downregulation of occludin expression, and that inhibiting ERK1/2 can reverse these effects. In addition, co-inhibition of MKP-1 and ERK1/2 exhibited similar effects to inhibition of ERK1/2. These findings suggest that overexpression of MKP-1 in ECs can prevent ischemia-induced occludin downregulation and cell death via deactivating ERK1/2, thereby protecting the integrity of BBB, alleviating brain injury, and improving post-stroke prognosis.  

Key words: blood-brain barrier, brain injury, cerebral ischemia, endothelial cells, extracellular signal-regulated kinase 1/2, functional recovery, mitogen-activated protein kinase phosphatase 1, occludin, oxygen and glucose deprivation, transient middle cerebral artery occlusion