吉林大学学报(医学版) ›› 2022, Vol. 48 ›› Issue (3): 568-574.doi: 10.13481/j.1671-587X.20220303

• 基础研究 • 上一篇    

重组人生长激素对局灶性脑缺血再灌注小鼠运动功能的改善作用及其机制

林韬1,李莹华2,连雅雯2,陈晓伟2(),万芪1()   

  1. 1.青岛大学附属医院神经外科 青岛大学神经再生与康复研究院, 山东 青岛 266071
    2.吉林大学第一医院康复医学科, 吉林 长春 130021
  • 收稿日期:2021-10-13 出版日期:2022-05-28 发布日期:2022-06-21
  • 通讯作者: 陈晓伟,万芪 E-mail:cxw0201@jlu.edu.cn;qiwan1@hotmail.com
  • 作者简介:林 韬(1995-),男,吉林省长春市人,在读硕士研究生,主要从事神经干细胞在脑损伤神经修复与再生机制方面的研究。
  • 基金资助:
    国家自然科学基金项目(82071385)

Improvement effect of recombinant human growth hormone on motor function in mice with focal cerebral ischemia- reperfusion and its mechanism

Tao LIN1,Yinghua LI2,Yawen LIAN2,Xiaowei CHEN2(),Qi WAN1()   

  1. 1.Department of Neurosurgery,Affiliated Hospital,Qingdao University,Institute of Neuroregeneration & Neurorehabilitation,Qingdao University,Qingdao 266071,China
    2.Department of Rehabilitation Medicine,First Hospital,Jilin University,Changchun 130021,China
  • Received:2021-10-13 Online:2022-05-28 Published:2022-06-21
  • Contact: Xiaowei CHEN,Qi WAN E-mail:cxw0201@jlu.edu.cn;qiwan1@hotmail.com

摘要: 目的

观察重组人生长激素对局灶性脑缺血再灌注小鼠运动功能的影响,探讨其可能的作用机制。

方法

选取C57BL/6J小鼠24只,采用改良Zea-Longa线栓法建立脑缺血再灌注损伤模型,随机分为生长激素治疗组(脑缺血再灌注+生长激素,SG组)和对照组(脑缺血再灌注+生理盐水,SS组),每组12只。SG组小鼠于造模后48 h开始颈部皮下注射重组人生长激素,剂量为1.4 mg·kg-1·d-1,持续14 d;SS组小鼠注射生理盐水,注射时间、剂量、部位及次数与SG组小鼠一致。分别于损伤前、损伤后1 d和损伤后16 d,采用平衡木实验评价小鼠运动协调能力,网屏实验评价小鼠肢体肌力,圆筒实验评价小鼠患肢使用率;损伤后16 d,采用免疫印迹法检测2组小鼠梗死灶周围区域中突触蛋白1(SYN1)表达水平。

结果

平衡木实验,损伤后1 d,2组小鼠运动协调能力评分均明显低于损伤前(P<0.01);损伤后16 d,2组小鼠运动协调能力评分均高于损伤后1 d(P<0.01),SG组小鼠运动协调能力评分较SS组升高(P<0.05)。网屏实验,损伤后1 d,2组小鼠倒置抓握网屏时的停留时间明显短于损伤前(P<0.01);损伤后16 d,2组小鼠停留时间均优于损伤后1 d(P<0.01);与SS组比较,SG组小鼠倒置抓握网屏时的停留时间明显延长(P<0.05)。圆筒实验,损伤后1 d,2组小鼠患侧肢体使用率明显低于损伤前(P<0.01);损伤后16 d,2组小鼠患侧肢体使用率均高于损伤后1 d(P<0.01),其中SG组小鼠较SS组患侧肢体使用率更高(P<0.05)。免疫印迹法检测,与SS组比较,SG组小鼠梗死灶周围区域中SYN1表达水平明显升高(P<0.05)。

结论

重组人生长激素能够改善局灶性脑缺血再灌注小鼠的运动功能,其机制可能与促进梗死灶周围区域中SYN1的表达有关。

关键词: 重组人生长激素, 脑缺血再灌注, 运动功能障碍, 突触蛋白1, 神经修复

Abstract: Objective

To observe the effect of recombinant human growth hormone on motor function in the mice with focal cerebral ischemia-reperfusion, and to explore its possible mechanism.

Methods

A total of 24 C57BL/6J mice were selected to establish the cerebral ischemia-reperfusion injury models by the modified Zea-Longa suture method, and they were randomly divided into growth hormone treatment group (cerebral ischemia-reperfusion+growth hormone, SG group, n=12) and control group (cerebral ischemia-reperfusion+saline, SS group, n=12). A total of 48 h after injury, the mice in SG group were injected subcutaneously with the recombinant human growth hormone at the dose of 1.4 mg·kg-1·d-1 for 14 d,and the mice in SS group were injected with saline, and the injection time, dose, location and times were consistent with the mice in SG group. Beam balance test was used to evaluate the motor coordination abilities of the mice before injury, 1 d after injury, and 16 d after injury;screen test was used to evaluate the muscle strengths of the mice, and the cylinder test was used to evaluate the utilization rates of the affected limb of the mice;the expression levels of synapsin1(SYN1) in peri-infarct region of the mice in two groups were detected by Western blotting method 16 d after injury.

Results

The beam balance test results showed that compared with before injury, the scores of motor coordination abilities of the mice in two groups 1 d after injury were decreased(P<0.01); the scores of motor coordination abilities of the mice in two groups 16 d after injury were higher than those 1 d after injury (P<0.01), and the score of motor coordination ability of the mice in SG group was higher than that in SS group (P<0.05). The screen test results showed that compared with before injury, the residence time when grasping the screen upside down of the mice in two groups was significantly shortened 1 d after injury (P<0.01), and the residence time of the mice in two groups 16 d after injury was longer than that 1 d after injury (P<0.01); compared with SS group, the residence time when grasping the screen upside down of the mice in SG group was significantly increased (P<0.05).The cylinder test results showed that the utilization rates of affected limb of the mice in two groups were decreased significantly 1 d after injury (P<0.01);compared with 1 d affter injury, the utilization rates of affected limb of the mice in two groups were increased 16 d after injury (P<0.01), and the utilization rate of the mice in SG group was higher than that in SS group (P<0.05). The Western blotting results showed that the expression level of SYN1 in peri-infarct region of the mice in SG group was significantly higher than that in SS group (P<0.05).

Conclusion

Recombinant human growth hormone can improve the motor function of the mice with focal cerebral ischemia-reperfusion, and its mechanism may be related to the promoting the expression level of SYN1 in peri-infarct region.

Key words: Recombinant human growth hormone, Cerebral ischemia-reperfusion, Motor dysfunction, Synapsin1, Nerve repairment

中图分类号: 

  • R45