中国组织工程研究 ›› 2022, Vol. 26 ›› Issue (20): 3158-3163.doi: 10.12307/2022.614

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

海带多糖干预对放射性脑损伤模型小鼠血脑屏障的保护

敖  翩1,赵  歆1,玉洪荣2,张思琴1,张馨月2,谷卫丽2,韦  力1,2   

  1. 1广西医科大学附属口腔医院,广西壮族自治区南宁市 530021;2广西医科大学人体解剖学教研室,广西壮族自治区南宁市 530021
  • 收稿日期:2021-02-27 接受日期:2021-04-10 出版日期:2022-07-18 发布日期:2022-01-19
  • 通讯作者: 韦力,硕士,教授,广西医科大学附属口腔医院,广西壮族自治区南宁市 530021;广西医科大学基础医学院人体解剖学教研室,广西壮族自治区南宁市 530021
  • 作者简介:敖翩,女,1995年生,湖南省湘潭市人,汉族,2018年长沙医学院毕业,硕士,医师,主要从事放射损伤方面的研究。
  • 基金资助:
    国家自然科学基金(81460479),项目负责人:韦力;广西自然科学基金(2018JJA140600),项目负责人:韦力

Laminaria japonica polysaccharide protects radiation-induced brain injury by regulating the blood-brain barrier in mice

Ao Pian1, Zhao Xin1, Yu Hongrong2, Zhang Siqin1, Zhang Xinyue2, Gu Weili2, Wei Li1, 2   

  1. 1The Affiliated Stomatological Hospital of Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China; 2Department of Human Anatomy, Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China
  • Received:2021-02-27 Accepted:2021-04-10 Online:2022-07-18 Published:2022-01-19
  • Contact: Wei Li, Master, Professor, The Affiliated Stomatological Hospital of Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China; Department of Human Anatomy, Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China
  • About author:Ao Pian, Master, Physician, The Affiliated Stomatological Hospital of Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China
  • Supported by:
    The National Natural Science Foundation of China, No. 81460479 (to WL); The Natural Science Foundation of Guangxi Zhuang Autonomous Region, No. 2018JJA140600 (to WL)

摘要:


文题释义:

血脑屏障:指脑毛细血管壁与神经胶质细胞形成的血浆与脑细胞之间的屏障和由脉络丛形成的血浆和脑脊液之间的屏障,这些屏障能够阻止某些物质由血液进入脑组织。
纤维蛋白原:是由肝细胞合成和分泌的一种糖蛋白,主要参与凝血和止血过程。高纤维蛋白原是各种血栓性疾病的重要危险因素,被认为是疾病状态的标志物,脑组织中大量纤维蛋白原的沉积已被广泛用作血脑屏障破坏的可靠标记物。

背景:放射治疗是脑部肿瘤的主要治疗手段之一,可显著提高临床疗效,但其对正常脑组织所产生的副反应严重影响了患者的生活质量。因此在提高脑肿瘤组织放射疗效的前提下,寻求一种能有效预防正常脑组织损伤的方式并对其机制进行研究变得尤为重要。
目的:探讨海带多糖干预对小鼠放射诱导脑损伤的影响及机制。
方法:选取96只SPF级雄性昆明小鼠,随机分为4组(n=24),即对照组、海带多糖组、放射组、放射+海带多糖组。放射前7 d连续给药预处理后,采用总剂量为30 Gy的60Go γ射线对小鼠脑部进行定位照射以建立放射性脑损伤模型。免疫荧光法检测纤维蛋白原、星形胶质细胞在脑组织中的活化及沉积情况,通过电镜观察脑血管系统超微结构变化,观察各组小鼠干预前后在Morris水迷宫中的运动轨迹。
结果与结论:①放射组小鼠纤维蛋白原在脑组织中的沉积明显增加,星形胶质细胞明显被激活;而放射+海带多糖组小鼠纤维蛋白原的沉积表达明显得到缓解;②电镜观察发现,放射组小鼠脑血管内皮细胞肿胀、基膜断裂脱落、血脑屏障结构发生改变;放射+海带多糖组小鼠血脑屏障超微结构形态与对照组相似,未见明显差别;③水迷宫结果显示,放射组小鼠穿过平台区的次数和中环活动时间明显减少(P < 0.05);而放射+海带多糖组小鼠在中心区及平台区的活动呈增加趋势;④提示海带多糖对放射性脑损伤的保护作用可能是通过维持血脑屏障结构的稳定及调节其通透性所实现的。

缩略语:胶质纤维酸性蛋白:glial fibrillary acidic protein,GFAP

https://orcid.org/0000-0002-9856-583X (敖翩) 

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: 海带多糖, 纤维蛋白原, 放射性脑损伤, 星形胶质细胞, 血脑屏障, 认知功能, 紧密连接

Abstract: BACKGROUND: Radiotherapy is one of the main methods for the treatment of brain tumors, which significantly improves the clinical efficacy. However, its side effects on normal brain tissue seriously affect the quality of life of patients. Therefore, it is particularly important to find a way to effectively prevent the damage of normal brain tissue and to study its mechanism.
OBJECTIVE: To explore the effect and mechanism of Laminaria japonica polysaccharide intervention on radiation-induced brain injury in mice.
METHODS: Ninety-six male Kunming mice, SPF grade, were randomly divided into four groups (n=24 per group): a control group, an irradiation group, a Laminaria japonica polysaccharide (LJP) group, and an irradiation+LJP group. All mice were given 7-day continuous administration before radiation, and then 60Go γ-rays (30 Gy) were used to establish a radiation brain injury model in mice. Immunofluorescence method was used to detect the expression of fibrinogen and activation and deposition of astrocytes in the brain tissue. The ultrastructural changes of the cerebrovascular system were investigated under transmission electron microscope. The motion trails of the mice in the Morris water maze were observed before and after treatment. 
RESULTS AND CONCLUSION: After radiotherapy, the expression of fibrinogen in brain tissue was significantly increased, and astrocytes were obviously activated, while the radiation plus LJP intervention significantly relieved the deposition of fibrinogen in mice. Under the electron microscope, the brain vascular endothelial cells swelled, the basement membrane was broken and shed, and the blood-brain barrier structure changed after radiation. However, the ultrastructural morphology of the mouse blood-brain barrier in the radiation+LJP group was similar to that of the control group. After radiation, the number of times and activity time of the mice passing through the platform area was significantly reduced in the Morris water maze test (P < 0.05), while the activities of the radiation mice in the platform area showed an increasing trend after the LJP intervention. These results suggest that the protective effect of LJP on radiation-induced brain injury may be mainly achieved by maintaining the stability of the blood-brain barrier structure and regulating its permeability. 

Key words: Laminaria japonica polysaccharide, fibrinogen, radiation-induced brain injury, astrocyte, blood-brain barrier, cognitive function, tight junction

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