实用医学杂志 ›› 2024, Vol. 40 ›› Issue (22): 3138-3145.doi: 10.3969/j.issn.1006-5725.2024.22.004

• 基础研究 • 上一篇    下一篇

M1型小胶质细胞极化在大脑皮层梗死后继发丘脑损伤中的作用

石喆1,2,左夏林2,3,彭林辉2,3,卢志伟1,2,李孔平1,2()   

  1. 1.广州医科大学附属脑科医院神经内科 (广东 广州 510370 )
    2.广东省神经科学疾病研究重点实验室、神经致病基因和离子通道教育部重点实验室 (广东 广州 510260 )
    3.广州医科大学附属第二医院神经科学研究所 (广东 广州 510260 )
  • 收稿日期:2024-07-12 出版日期:2024-11-25 发布日期:2024-11-25
  • 通讯作者: 李孔平 E-mail:Lkp159123@163.com
  • 基金资助:
    国家自然科学基金项目(81971233);广州市科技计划项目(2023A04J1203);广州医科大学科研能力提升项目(2023-2024)

Effect of M1 microglial polarization on secondary damage in the thalamus after cerebral cortical infarction

Zhe SHI1,2,Xialin ZUO2,3,Linhui PENG2,3,Zhiwei LU1,2,Kongping. LI1,2()   

  1. *.Department of Neurology,the Affiliated Brain Hospital,Guangzhou Medical University,Guangzhou 510370,Guangdong,China
    *.Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China,Guangzhou Medical University,Guangzhou 510260,Guangdong,China
  • Received:2024-07-12 Online:2024-11-25 Published:2024-11-25
  • Contact: Kongping. LI E-mail:Lkp159123@163.com

摘要:

目的 探讨M1型小胶质细胞极化在大脑皮层梗死后继发丘脑损伤中的作用。 方法 使用电凝法制备成年雄性SD大鼠的局灶性皮层梗死模型,并将其随机分为假手术组和术后1 ~ 4周的不同时间点模型组。在评估各组大鼠神经功能改变的基础上,通过免疫组织化学和免疫荧光分别检测丘脑VPN区NeuN、GFAP、Iba-1和Iba-1+/CD68+ (M1型小胶质细胞)及Iba-1+/CD206+ (M2型小胶质细胞) 阳性细胞数量和形态变化;通过免疫印迹检测丘脑VPN区IL-1β、TNF-α、IL-10和Arg-1表达水平。 结果 与假手术组相比,模型组4周时NeuN免疫阳性细胞减少(P < 0.05),GFAP和Iba-1免疫阳性细胞增多(P < 0.05),促炎因子TNF-α和IL-1β表达明显升高(P < 0.05),神经功能学评分显著升高(P < 0.05)。与M2型小胶质细胞相比,模型组4周梗死同侧丘脑VPN区M1型小胶质细胞显著增多(P < 0.05)。 结论 M1型小胶质细胞极化可能参与了大脑皮层梗死后同侧丘脑损害的过程。

关键词: 脑梗死, 远隔损害, 丘脑, 小胶质细胞极化, 神经炎症

Abstract:

Objective To explore the effects of M1 polarization of microglia on secondary damage in the thalamus after cerebral cortical infarction. Methods A focal cortical infarct model of adult male SD rats was prepared using eletrocoagulation and randomized into Sham and model groups at different time points 1 ~ 4 weeks after surgery. Based on the assessment of neurofunctional changes in each group of rats, immunohistochemistry was used to observe the number and morphology of NeuN, GFAP and Iba-1 positive cells in (Ventral posterior nucleus of thalamus, VPN) of the ipsilateral thalamus after distal middle cerebral artery occlusion (dMCAO). Immunofurescence was used to detect the number and morphology of M1 microglia marker (Iba-1+/CD68+ cells) and M2 microglia marker (Iba-1+/CD206+ cells) in VPN of the ipsilateral thalamus after dMCAO. Western blot was used to detect the expression levels of IL-1β, TNF-α, IL-10 and Arg-1 in VPN of the ipsilateral thalamus after dMCAO. Results The results of immunohistochemistry showed a significant decrease in NeuN positive cells and an increase in the density of GFAP and Iba-1 in the ipsilateral VPN of rats after dMCAO when compared with Sham group (P < 0.001). Compared with sham group, the protein levels of TNFα and IL-1β were elevated in the ipsilateral VPN elevated (P < 0.05). In addition, the model group rats exhibited higher Bederson scores, beam-walking test and adhesive removal test scores after dMCAO compared with Sham group (P < 0.05). The numbers of M1 microglia marker (Iba-1+/CD68+ cells) were significantly increased when compared with M2 microglia marker (Iba-1+/CD206+ cells) in ipsilateral VPN of rats after dMCAO. Conclusion M1 polarization of microglia may play an essential role in secondary damage of thalamus after cerebral cortical infarction.

Key words: cerebral infarction, secondary damage, thalamus, microglia polarization, neuroinflammation

中图分类号: