吉林大学学报(医学版) ›› 2023, Vol. 49 ›› Issue (5): 1182-1191.doi: 10.13481/j.1671-587X.20230511

• 基础研究 • 上一篇    

色甘酸二钠对大鼠脑缺血/再灌注损伤的改善作用及其机制

朱娴,陈薪旭,陈奕斌,黎昌炫,刘杰,王埮()   

  1. 海南医学院第一附属医院神经内科,海南 海口 570102
  • 收稿日期:2022-08-10 出版日期:2023-09-28 发布日期:2023-10-26
  • 通讯作者: 王埮 E-mail:1821007419@qq.com
  • 作者简介:朱 娴(1989-),女,安徽省宿州市人,主治医师,医学硕士,主要从事神经内科疾病诊治方面的研究。
  • 基金资助:
    海南省卫健委卫生健康行业科研项目(21A200211)

Improvement effect of sodium cromoglycate on cerebral ischemia/reperfusion injury in rats and its mechanism

Xian ZHU,Xinxu CHEN,Yibin CHEN,Changxuan LI,Jie LIU,Tan WANG()   

  1. Department of Neurology,First Affiliated Hospital,Hainan Medical College,Haikou 570102,China
  • Received:2022-08-10 Online:2023-09-28 Published:2023-10-26
  • Contact: Tan WANG E-mail:1821007419@qq.com

摘要:

目的 探讨色甘酸二钠(SCG)对缺血性卒中(CIS)大鼠神经功能和认知功能的影响,阐明其作用机制。 方法 选取80只雄性SD大鼠,随机选取18只作为假手术组,剩余大鼠采用线栓法构建大鼠脑缺血/再灌注(I/R)损伤模型。将造模成功的45只大鼠随机分为I/R组、I/R+低剂量SCG组和I/R+高剂量SCG组,每组15只。造模后24 h,I/R+低剂量SCG组和I/R+高剂量SCG组大鼠分别腹腔注射20 和60 mg·kg-1 SCG,连续2周。采用改良的神经功能缺损程度评分(mNSS)法评估各组大鼠神经功能评分,2,3,5-氯化三苯基四氮唑(TTC)染色检测各组大鼠脑梗死面积,Y型迷宫实验检测各组大鼠记忆能力,电生理检测各组大鼠正确反应率、正确反应时间和兴奋性突触后电位(fEPSP)斜率,高尔基染色检测各组大鼠脑组织中海马齿状回区树突棘密度,免疫荧光法检测各组大鼠脑组织中海马齿状回区5-溴脱氧尿嘧啶核苷(BrdU)阳性细胞数和双肾上腺皮质激素(DCX)蛋白表达水平, Western blotting法检测各组大鼠脑组织中脑源性神经营养因子(BDNF)、抗酪氨酸激酶受体B(TrkB)、神经生长因子3(NT-3)和抗酪氨酸激酶受体C(TrkC)蛋白表达水平。 结果 与假手术组比较,I/R组大鼠神经功能评分升高(P<0.05),脑梗死区域面积增大(P<0.05),正确反应率降低(P<0.05),正确反应时间增加(P<0.05),fEPSP斜率和树突棘密度降低(P<0.05),脑组织齿状回区BrdU阳性细胞数和DCX蛋白表达水平差异无统计学意义(P>0.05),海马组织中NT-3蛋白表达水平升高(P<0.05),而BNDF、TrkB和TrkC蛋白表达水平差异无统计学意义(P>0.05)。与I/R组比较,I/R+高剂量SCG组大鼠神经功能评分降低(P<0.05),脑梗死面积减少(P<0.05),正确反应率升高(P<0.05),正确反应时间减少(P<0.05),fEPSP斜率和树突棘密度升高(P<0.05),脑组织中海马齿状回区BrdU阳性细胞数和DCX蛋白表达水平明显升高(P<0.05),大鼠海马组织中BDNF、TrkB、NT-3和TrkC蛋白表达水平升高(P<0.05)。 结论 SCG对I/R损伤模型大鼠神经功能与认知功能具有保护作用,其作用机制可能与SCG提高BDNF/TrkB和NT-3/TrkC信号通路蛋白表达及促进神经元增殖有关。

关键词: 色甘酸二钠, 卒中, 神经新生, 脑缺血, 再灌注损伤, 认知功能

Abstract:

Objective To discuss the effect of sodium cromoglycate (SCG) on the neural function and cognitive function in the rats with cerebral ischemic stroke (CIS), and to clarify its mechanism. Methods A total of 80 male SD rats were selected and 18 were randomly selected as sham operation group. The remaining rats were constructed the cerebral ischemia/reperfusion(I/R) injury models by thread embolization method. The 45 successful modeling rats were randomly divided into I/R group, I/R + low dose of SCG group, and I/R +high dose of SCG group(n=15).At 24 h after modeling, the rats in I/R+low dose of SCG group and I/R +high dose of SCG group were intraperitoneally injected with 20 and 60 mg·kg-1 SCG for 2 weeks,respectively. The neurological scores of the rats in various groups were evaluated by modified neurological severity score(mNSS) criterion; the area of cerebral infarction was detected by using 2,3,5-triphenyltetrazolium chloride (TTC) staining;the Y-maze experiment was used to detect the memory abilities of the rats in various groups;electrophysiological measurement was used to analyze the accurate reaction rate, accurate reaction time, and field excitatory postsynaptic potential (fEPSP) slopes of the rats in various groups;Golgi staining was used to detect the morphology of dendritic spines in dentate gyrus of hippocampus in brain tissue of the rats in various groups;immunofluorescence method was used to detect the numbers of 5-bromodeoxyuridine (BrdU) positive cells and the expression levels of doublecortin (DCX) protein in dentate gyrus of hippocampus in brain tissue of the rats in various groups; Western blotting method was used to detect the expression levels of brain-derived neurotrophic factor (BDNF),tyrosine kinase B receptor (TrkB), neurotrophin 3 (NT-3),and tyrosine kinase C receptor (TrkC) proteins in brain tissue of the rats in various groups. Results Compared with sham operation group, the neurological score and the cerebral infarction area of the rats in I/R group were increased(P<0.05),the accurate reaction rate was decreased (P<0.05),and the accurate reaction time was increased (P<0.05), the fEPSP slope and the density of dendritic spine was decreased (P<0.05), the number of BrdU positive cells in dentate gyrus of hippocampus in brain tissue and the expression level of DCX protein in hippocampus tissue had no significant differences(P>0.05),and the expression level of NT-3 protein in hippocampus tissue was increased(P<0.05),but the expression levels of BNDF,TrkB, and TrkC proteins had no significant differences(P>0.05). Compared with I/R group, the neurological scores of the rats in I/R+high dose of SCG group was decreased (P<0.05), the infarction area was decreased (P<0.05), the accurate reaction rate was increased (P<0.05), the accurate reaction time was decreased (P<0.05),the fEPSP slope and the dendritic spine density were increased (P<0.05),the number of BrdU positive cells and the expression level of DCX protein in dentate gyrus of hippocampus in the brain tissue were increased (P<0.05), and the expression levels of BDNF,TrkB, NT-3, and TrkC proteins were significantly increased (P<0.05). Conclusion SCG has the protective effect on the neurological and cognitive functions in the I/R model rats and its mechanism may be related to the increasing of the expressions of BDNF/TrkB and NT-3/TrkC signaling pathway related proteins and promoting the proliferation of the neurons.

Key words: Sodium cromoglycate, Stroke, Neurogenesis, Brain ischemia, Reperfusion injury, Cognitive function

中图分类号: 

  • R364.6