中国神经再生研究(英文版) ›› 2024, Vol. 19 ›› Issue (7): 1541-1547.doi: 10.4103/1673-5374.386398

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

激活Wnt/β-catenin/CYP1B1通路有助于减轻缺血再灌注致血脑屏障损伤

  

  • 出版日期:2024-07-15 发布日期:2023-11-28
  • 基金资助:
    国家自然科学基金;福建省自然科学基金;福建省医学创新工程项目;福建省中青年医疗卫生领军人才研究培养资助项目

Activation of the Wnt/β-catenin/CYP1B1 pathway alleviates oxidative stress and protects the blood-brain barrier under cerebral ischemia/reperfusion conditions

Xingyong Chen1, #, Nannan Yao1, 2, #, Yanguang Mao1, #, Dongyun Xiao1, Yiyi Huang1, Xu Zhang1, *, Yinzhou Wang1, 3, 4, *   

  1. 1Department of Neurology, Fujian Provincial Hospital, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, Fujian Province, China; 2Department of Neurology, Cangzhou Central Hospital, Cangzhou, Hebei Province, China; 3Fujian Academy of Medical Science, Fuzhou, Fujian Province, China; 4Key Testing Laboratory of Fujian Province, Fuzhou, Fujian Province, China
  • Online:2024-07-15 Published:2023-11-28
  • Contact: Yinzhou Wang, MD, PhD, wphd@163.com; Xu Zhang, zhangxufjsl@163.com.
  • Supported by:
    This study was supported by the National Natural Science Foundation of China, No. 81771250 (to XC); the Natural Science Foundation of Fujian Province, Nos. 2020J011059 (to XC), 2020R1011004 (to YW), 2021J01374 (to XZ); Medical Innovation Project of Fujian Province, No. 2021CXB002 (to XC); and Fujian Research and Training Grants for Young and Middle-aged Leaders in Healthcare (to XC).

摘要:

越来越多的证据表明,氧化应激和 Wnt/β-catenin通路参与了脑卒中后血脑屏障破坏。然而,两者在缺血性卒中的潜在联系仍不清楚。实验发现脑缺血导致氧化应激和Wnt/β-catenin通路的抑制,而糖原合成酶激酶3β抑制剂TWS119激活该通路可减轻氧化应激,增加脑缺血再灌注损伤大鼠CYP1B1和紧密连接紧密连接蛋白ZO-1,occludin和claudin-5的水平以及脑微血管密度。体外模拟细胞缺血缺氧模型研究发现,氧糖剥夺/复氧诱导大鼠脑微血管内皮细胞的氧化应激和抑制Wnt/β-catenin通路,加重细胞凋亡,下调CYP1B1和紧密连接蛋白水平,抑制大鼠脑微血管内皮细胞的增殖和迁移。然而,在大鼠脑微血管内皮细胞中过表达或敲低β-catenin基因则改善或加重了这些效果。此外,敲低β-catenin可降低大鼠脑微血管内皮细胞中CYP1B1的蛋白表达,而敲低CYP1B1并未改变氧糖剥夺/复氧后大鼠脑微血管内皮细胞中GSK-3β,Wnt-3a和β-catenin的蛋白水平。因此,CYP1B1可能作为Wnt/β-catenin通路的下游靶点,激活Wnt/β-catenin/CYP1B1通路有助于改善氧化应激,增加紧密连接蛋白水平,减轻缺血缺氧诱导的血管内皮细胞损伤。说明激活Wnt/β-catenin/CYP1B1通路有助于维持血脑屏障完整性,是治疗缺血性脑卒中的潜在新策略。

https://orcid.org/0000-0002-9595-2244 (Yinzhou Wang); https://orcid.org/0000-0002-4064-4228 (Xu Zhang)

Abstract: Accumulating evidence suggests that oxidative stress and the Wnt/β-catenin pathway participate in stroke-induced disruption of the blood-brain barrier. However, the potential links between them following ischemic stroke remain largely unknown. The present study found that cerebral ischemia leads to oxidative stress and repression of the Wnt/β-catenin pathway. Meanwhile, Wnt/β-catenin pathway activation by the pharmacological inhibitor, TWS119, relieved oxidative stress, increased the levels of cytochrome P450 1B1 (CYP1B1) and tight junction-associated proteins (zonula occludens-1 [ZO-1], occludin and claudin-5), as well as brain microvascular density in cerebral ischemia rats. Moreover, rat brain microvascular endothelial cells that underwent oxygen glucose deprivation/reoxygenation displayed intense oxidative stress, suppression of the Wnt/β-catenin pathway, aggravated cell apoptosis, downregulated CYP1B1 and tight junction protein levels, and inhibited cell proliferation and migration. Overexpression of β-catenin or knockdown of β-catenin and CYP1B1 genes in rat brain microvascular endothelial cells at least partly ameliorated or exacerbated these effects, respectively. In addition, small interfering RNA-mediated β-catenin silencing decreased CYP1B1 expression, whereas CYP1B1 knockdown did not change the levels of glycogen synthase kinase 3β, Wnt-3a, and β-catenin proteins in rat brain microvascular endothelial cells after oxygen glucose deprivation/reoxygenation. Thus, the data suggest that CYP1B1 can be regulated by Wnt/β-catenin signaling, and activation of the Wnt/β-catenin/CYP1B1 pathway contributes to alleviation of oxidative stress, increased tight junction levels, and protection of the blood-brain barrier against ischemia/hypoxia-induced injury.

Key words: blood-brain barrier, CYP1B1, oxidative stress, oxygen glucose deprivation/reoxygenation, tight junction, vascular endothelial cells, Wnt/β-catenin pathway, β-catenin