betway必威登陆网址 (betway.com )学报 ›› 2021, Vol. 42 ›› Issue (9): 645-650.DOI: 10.3969/j.issn.2097-0005.2021.09.002

• 基础研究 • 上一篇    

Nrf2激活剂CDDO-EA抑制蛛网膜下腔出血后神经功能损伤及促进小胶质细胞M2型转化

董其威, 赵华阳, 任世浩, 张朋杰, 侯亚军, 毛蕾蕾()   

  1. betway必威登陆网址 (betway.com )生命betway必威亚洲 中心,山东省高校脑微循环重点实验室,山东 泰安  271000
  • 收稿日期:2021-03-03 出版日期:2021-10-13 发布日期:2021-10-13
  • 通讯作者: 毛蕾蕾
  • 作者简介:董其威,临床医学本科学生。
  • 基金资助:
    国家级大学生创新创业训练项目(201810439038);泰安市科技发展计划(2019NS104)

Attenuation of neurological deficit after SAH and the promotion of microglia polarization toward M2 phenotype in mice by the novel Nrf2 activator CDDO-EA

Qiwei Dong, Huayang Zhao, Shihao Ren, Pengjie Zhang, Yajun Hou, Leilei Mao()   

  1. Life Sciences Research Center,Shandong First Medical University & Shandong Academy of Medical Sciences; Key Laboratory of Cerebral Microcirculation of Shandong Higher Institutions,Taian 271000,China
  • Received:2021-03-03 Online:2021-10-13 Published:2021-10-13
  • Contact: Leilei Mao

摘要: 目的

探讨新型核因子2相关因子 (NFE2 related factor 2, Nrf2)的激活剂CDDO-EA对小鼠蛛网膜下腔出血(subarachnoid hemorrhage,SAH)后神经功能缺损及小胶质细胞极化的影响。

方法

应用大脑中动脉穿刺法制作SAH模型,术后72 h进行神经功能评分,随后处死小鼠并留取脑组织进行冰冻切片,采用免疫荧光双标染色CD206/Iba1标记M2型小胶质细胞。

结果

术后48 h收集各组动物大脑皮层做Western blot检测CDDO-EA表达量,结果表明,50 μg及100 μg CDDO-EA处理组脑内Nrf2表达量较PBS对照组均明显增加(P < 0.05)。我们采用50 μg最佳剂量治疗SAH小鼠,术后72 h对各组动物进行神经功能评分,结果表明SAH模型小鼠具有明显的神经功能障碍,而给予CDDO-EA治疗后神经功能有所改善(P < 0.05)。另外,CDDO-EA治疗后大脑皮层及海马M2型小胶质细胞比Vehicle对照组明显增多。

结论

CDDO-EA治疗蛛网膜下腔出血能够有效改善神经功能,很有可能是通过上调Nrf2表达促进小胶质细胞向M2型转化实现的。

关键词: 蛛网膜下腔出血, Nrf2, 小胶质细胞, CDDO-EA

Abstract: Objective

To investigate the effects of CDDO-EA (CDDO-ethylamide), a novel Nrf2 related factor 2 (Nrf2)?, on neurological deficit and microglia polarization after subarachnoid hemorrhage (SAH) in mice.

Methods

Thirty healthy C57BL/6 mice were randomly divided into sham group, SAH + PBS group and SAH + CDDO-EA (50 μg) group. The SAH model was made by middle cerebral artery puncture, and the mice were sacrificed 3 days after operation for neurological function score. Brain tissue was collected for frozen sections and the M2-type microglia cells were labeled with CD206/Iba1 by immunofluorescence double staining.

Results

The cerebral cortex of each group was collected 48 h after operation to detect the expression of CDDO-EA by Western blot. Compared with PBS control group, the expression of Nrf2 in brain of 50 μg and 100 μg treatment groups was significantly increased (P < 0.05).The mice received PBS or CDDO-EA(50 μg) after surgery by intraperitoneal injection. The neurological function score was evaluated 72 h after surgery. SAH mice had obvious neurological dysfunction, but the neurological function was improved after CDDO-EA treatment (P < 0.05). In addition, the numberof M2 microglia in cerebral cortex and hippocampus after CDDO-EA treatment significantly increased than that in vehicle control group.

Conclusion

CDDO-EA treatment attenuates neurological deficits after SAH, which may be achieved by up-regulating the expression of Nrf2 and promoting microglia polarization toward M2 phenotype.

Key words: subarachnoid hemorrhage, Nrf2, microglia, CDDO-EA

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