中国组织工程研究 ›› 2021, Vol. 25 ›› Issue (8): 1218-1223.doi: 10.3969/j.issn.2095-4344.3060

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

诱导急性脊髓损伤模型大鼠炎症反应信号通路的变化

柴  乐1,吕建兰2,胡劲涛2,胡华辉 3,许庆军 1,余进伟1,全仁夫3   

  1. 1焦作市第二人民医院,河南省焦作市   454190;2 浙江中医药大学,浙江省杭州市   310053;3 浙江中医药大学附属江南医院,浙江省杭州市  311200
  • 收稿日期:2020-01-16 修回日期:2020-01-18 接受日期:2020-05-09 出版日期:2021-03-18 发布日期:2020-12-11
  • 通讯作者: 全仁夫,博士,主任医师,浙江中医药大学附属江南医院,浙江省杭州市 311200
  • 作者简介:柴乐,男,1991年生,河南省焦作市人,汉族,2019年浙江中医药大学毕业,硕士,医师,主要从事脊髓损伤后炎症反应研究。
  • 基金资助:
    杭州市卫生计生科技计划项目(OO20191175);萧山区科技项目(2018216)

Signal pathway variation after induction of inflammatory response in rats with acute spinal cord injury

Chai Le1, Lü Jianlan2, Hu Jintao2, Hu Huahui3, Xu Qingjun1, Yu Jinwei1, Quan Renfu3   

  1. 1Jiaozuo Second People’s Hospital, Jiaozuo 454190, Henan Province, China; 2Zhejiang Chinese Medical University, Hangzhou 310053, Zhejiang Province, China; 3Jiangnan Hospital Affiliated to Zhejiang Chinese Medical University, Hangzhou 311200, Zhejiang Province, China
  • Received:2020-01-16 Revised:2020-01-18 Accepted:2020-05-09 Online:2021-03-18 Published:2020-12-11
  • Contact: Quan Renfu, MD, Chief physician, Jiangnan Hospital Affiliated to Zhejiang Chinese Medical University, Hangzhou 311200, Zhejiang Province, China
  • About author:Chai Le, Master, Physician, Jiaozuo Second People’s Hospital, Jiaozuo 454190, Henan Province, China
  • Supported by:
    Hangzhou Municipal Health and Family Planning Technology Project, No. OO20191175; Science and Technology Project of Xiaoshan District, No. 2018216

摘要:

文题释义:
高迁移率族蛋白1:是一种高度保守的DNA结合蛋白,与基因修复及转录调控密切相关。同时大量研究表明高迁移率族蛋白1也是坏死损伤和缺血损伤的模型中是重要的炎性递质。
Toll样受体(Toll-like receptors,TLR):是参与非特异性免疫(天然免疫)的一类重要蛋白质分子,也是连接非特异性免疫和特异性免疫的桥梁。Toll样受体是单个的跨膜非催化性蛋白质,可以识别来源于微生物的具有保守结构的分子。当微生物突破机体的物理屏障,如皮肤、黏膜等时,Toll样受体可以识别它们并激活机体产生免疫细胞应答。

背景:前期研究发现采用芒针治疗可改善脊髓损伤后的炎症反应,降低高迁移率族蛋白1和促炎性因子的表达,抑制核转录因子的活性及神经细胞凋亡的发生。
目的:分析脊髓损伤后炎症反应发生机制与HMGB-1/TLR4/NF-κB信号通路的相关性。
方法:参考国际公认的改良Allen’s造模法制作T9-T10脊髓损伤大鼠模型,分别在造模后6 h,24 h,3 d,7 d获取大鼠脊髓及尾动脉血液标本并进行BBB评分;ELISA分别检测脊髓及尾动脉血清中高迁移率族蛋白1的水平,确定脊髓中高迁移率族蛋白1最高点及血清与脊髓中高迁移率族蛋白1含量的变化规律。将大鼠分为模型组、甘草酸组(采用甘草酸灌胃200 mg/kg)、空白组、假手术组4组,在高迁移率族蛋白1表达最高时间点获取脊髓,通过RT-PCR、免疫印迹技术检测大鼠脊髓中高迁移率族蛋白1、Toll样受体4、核因子κB的基因和蛋白表达,观察大鼠脊髓病理形态变化。实验方案经浙江中医药大学动物实验伦理委员会批准。
结果与结论:①脊髓损伤后,3 d脊髓及血液中高迁移率族蛋白1的表达量明显高于6 h,24 h,7 d(P < 0.05);②脊髓损伤3 d时,甘草酸组脊髓中高迁移率族蛋白1、Toll样受体4、核因子κB、白细胞介素6、肿瘤坏死因子表达低于模型组,高于空白组及假手术组(P < 0.05);③甘草酸组高迁移率族蛋白1、Toll样受体4、核因子κB蛋白和基因表达显著低于模型组,高于空白组及假手术组(P < 0.05);④结果说明,脊髓损伤后,血液及脊髓中的高迁移率族蛋白1显著升高,3 d时处于最高值;通过抑制高迁移率族蛋白1后,发现HMGB-1/TLR4/NF-κB通路是诱发脊髓损伤后炎症反应的重要通路之一。
https://orcid.org/0000-0002-4230-5465 (柴乐) 

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: 脊髓, 损伤, 蛋白, 核因子, 通路, 炎症反应, 模型,

Abstract: BACKGROUND: Previous studies found that treatment with awn needles can improve the inflammatory response after spinal cord injury, reduce the expression of high-mobility group protein 1 (HMGB-1) and pro-inflammatory factors, and inhibit the activity of nuclear transcription factors and the occurrence of neuronal apoptosis.
OBJECTIVE: To analyze the relationship between the mechanism of inflammatory response and the HMGB-1/Toll-like receptor 4 (TLR4)/nuclear factor-κB (NF-κB) signaling pathway after spinal cord injury. 
METHODS: The T9-10 spinal cord injury model was made according to the internationally recognized modified Allen’s modeling method. The blood samples of the spinal cord and tail artery were obtained for Basso, Beattie and Bresnahan scoring at 6, 24 hours, 3 and 7 days after modeling. The HMGB-1 content in the spinal cord and tail artery serum was measured by ELISA to determine the highest point of HMGB-1 in the spinal cord and the change rule of HMGB-1 content in serum and spinal cord. Taking the highest HMGB-1 content as the research point and using glycyrrhizic acid as the HMGB-1 inhibitor, the rats were divided into four groups: model group, glycyrrhizic acid group (intragastric administration of glycyrrhizic acid, 200 mg/kg), blank group and sham operation group. The highest HMGB-1 expression was determined by ELISA. The spinal cord was obtained at the highest point of HMGB1 expression. The correlation between HMGB-1/TLR4/NF-κB signaling pathway and inflammation after spinal cord injury was explored by immunoblotting and RT-PCR detection, and the pathological changes of spinal cord in rats were observed. Approval for this study was obtained by the Animal Experimental Ethics Committee of Zhejiang Chinese Medical University .
RESULTS AND CONCLUSION: The expression of HMGB-1 in the spinal cord and blood at 3 days after spinal cord injury was significantly higher than that at 6 hours, 24 hours, and 7 days (P < 0.05). At 3 days after spinal cord injury, the expressions of HMGB-1, TLR4, NF-κB, interleukin-6, and tumor necrosis factor-α in the glycyrrhizic acid group were lower than those in the model group, but higher than those in the blank group and sham operation group (P < 0.05). The expressions of HMGB-1, TLR4 and NF-κB at gene and protein levels in the glycyrrhizic acid group were lower than those in the model group, but higher than those in the blank group and the sham operation group (P < 0.05). To conclude, after spinal cord injury, HMGB-1 in blood and spinal cord increased significantly and reached the highest value at 3 days. After inhibiting HMGB-1, it was found that the HMGB-1/TLR4/NF-κB pathway is one of the important pathways to induce inflammation after spinal cord injury.

Key words: spinal cord, injury, protein, nuclear factor, pathway, inflammatory response, model, rat

中图分类号: