中国临床解剖学杂志 ›› 2023, Vol. 41 ›› Issue (6): 698-703.doi: 10.13418/j.issn.1001-165x.2023.6.12

• 实验研究 • 上一篇    下一篇

TBI大鼠Claudin-5紧密连接蛋白表达变化及CBD干预研究

康丽1#,    曹艳2#,    李恒希2,    李佳丽2,    凌腾晗2,    尹爱平2,    张瑞林3,    李坪2*   

  1. 1.河南护理职业学院人体解剖与组织胚胎学教研室,  河南   安阳    455000;    2.昆明医科大学人体解剖学与
    组织胚胎学系,  昆明   650500;    3.昆明医科大学法医学院毒物化学系,  昆明   650500
  • 收稿日期:2022-06-27 出版日期:2023-11-25 发布日期:2023-12-26
  • 通讯作者: 李坪,教授,博士生导师,E-mail:kyzplp@163.com
  • 作者简介:康丽(1987-),女,讲师,研究方向:中枢神经损伤与修复,E-mail:657609736@163.com;共同第一作者:曹艳(1996-),女,在读博士,研究方向:神经系统损伤与修复,E-mail:956930593@qq.com
  • 基金资助:
    国家自然科学基金项目(82060241);云南省科技厅-昆明医科大学应用基础研究联合专项重点项目(202101AY070001-002)

Changes of Claudin-5 tight junction protein expression and ameliorative effects of CBD intervention in rats after traumatic brain injury

Kang Li1#, Cao Yan2#, Li Hengxi2, Li Jiali2, Ling Tenghan2, Yin Aiping2, Zhang Ruilin3, Li Ping   

  1. 1.Department of Human Anatomy and Histology & Embryology, Henan Vocational College of Nursing, Anyang 455000, China; 2. Department of Human Anatomy and Histology & Embryology, Kunming Medical University, Kunming 650500, China; 3. Department of Toxicology, College of Forensic Medicine, Kunming Medical University, Kunming 650500, China
  • Received:2022-06-27 Online:2023-11-25 Published:2023-12-26

摘要: 目的    观察大鼠创伤性脑损伤(traumatic brain injury,TBI)后脑微血管内皮细胞间紧密连接蛋白Claudin-5表达的时序性规律,探讨大麻二酚(cannabidiol,CBD)的干预作用。  方法    采用改良Feeney自由落体撞击法建立SD大鼠TBI模型,随机分为对照组(Sham组)、模型组(TBI+vehicle组)和干预组(TBI+CBD组),每组分8 h、1 d、2 d、3 d、5 d和7 d 6个亚组(n=3)。运用RT-PCR、免疫组织化学染色和免疫荧光双标染色实验,观察CBD干预对TBI后Claudin-5阳性表达与星形胶质细胞(astrocyte,AST)激活的影响。  结果    PCR结果表明:TBI后不同时间段Claudin-5的mRNA表达下降,CBD干预后,其表达有明显回升。免疫组化及免疫荧光结果表明,Sham组Claudin-5蛋白表达于脑微血管内皮细胞连接处,呈点状、线条状,AST胞体较小、突起少呈细长状;TBI后Claudin-5阳性细胞线条断裂,其表达显著减弱且呈下降趋势,以2 d组表达最低(P<0.05),此外,AST被激活,胞体变大、突起增多肿胀;CBD干预后Claudin-5阳性表达显著升高,AST激活状态明显减弱,胞体有所回缩,足板肿胀减轻。胶质纤维酸性蛋白阳性表达的AST和Claudin-5蛋白不存在共表达,但是AST伸出的足板与微血管内皮细胞直接相贴附。  结论    TBI后AST激活并参与Claudin-5蛋白表达的调节;CBD可能通过调控AST的激活状态调节Claudin-5阳性表达,进而改善血脑屏障的通透性。

关键词: TBI; ,  , 紧密连接蛋白Claudin-5; ,  , CBD; ,  , 大鼠

Abstract: Objective    To observe the expression of Claudin-5 in brain microvascular endothelial cells after traumatic brain injury (TBI), and to investigate the intervention effect of cannabidiol (CBD).   Methods  TBI model of SD rats was established by modified Feeney free-fall impingement method. After modeling, the rats were randomly divided into a sham group (sham group), a TBI + Vehicle group and a TBI+CBD group (intervention group), and each group was divided into 6 subgroups (n=3) at 8 h, 1 d, 2 d, 3 d, 5 d and 7 d. RT-PCR, Immunohistochemistry staining and immunofluorescence double-standard staining were used to observe the effect of the CBD intervention on positive Claudin-5 expression of  and the  astrocytes (AST) activation after TBI.    Results   The mRNA expression of Claudin-5 decreased at different time periods after TBI, while the mRNA expression of Claudin-5 increased significantly after CBD intervention. Claudin-5 protein expression was located at the junction of brain microvascular endothelial cells, and the AST cell body was small, with few protrusions and elongated in the sham group. After TBI, Claudin-5 positive cell lines were broken, and the expression of Claudin-5 was significantly decreased and showed a downward trend, and the expression of them was the lowest in the 2 d group (P<0.05). In addition, ATS were activated, and the cell bodies became larger, the protrusions became increased and swollen. After CBD intervention, the positive expression of Claudin-5 was significantly increased, the AST activation state was significantly weakened, the cell body was increased, and the foot plate swelling was reduced. It was also observed that there was no co-expression between GFAP positive AST and Claudin-5 protein, but the foot plate extended by AST was directly attached to microvascular endothelial cells.   Conclusions   AST is activated and involved in the regulation of Claudin-5 protein expression after TBI. CBD may indirectly regulate the positive expression of Claudin-5 by regulating the activation state of AST, thus improving the permeability of blood brain barrier.  

Key words: TBI; ,  , Tight junction protein Claudin-5; ,  , CBD; ,  , Rat  

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