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中华脑科疾病与康复杂志(电子版) ›› 2025, Vol. 15 ›› Issue (04) : 199 -207. doi: 10.3877/cma.j.issn.2095-123X.2025.04.002

基础研究

高频及低频重复经颅磁刺激对急性一氧化碳中毒迟发性脑病的疗效
金渊媛1, 刘丽美2, 黄妍1, 张军1,()   
  1. 1014040 包头市中心医院康复医学科
    2810000 西宁,青海大学附属医院临床医学院
  • 收稿日期:2024-12-09 出版日期:2025-08-15
  • 通信作者: 张军

Therapeutic effect of high-frequency and low-frequency repetitive transcranial magnetic stimulation on delayed encephalopathy after acute carbon monoxide poisoning

Yuanyuan Jin1, Limei Liu2, Yan Huang1, Jun Zhang1,()   

  1. 1Department of Rehabilitation Medicine, Baotou Central Hospital, Baotou 014040, China
    2Clinical Medical College, Affiliated Hospital of Qinghai University, Xining 810000, China
  • Received:2024-12-09 Published:2025-08-15
  • Corresponding author: Jun Zhang
  • Supported by:
    Natural Science Foundation of Inner Mongolia Autonomous Region(2020MS08003)
引用本文:

金渊媛, 刘丽美, 黄妍, 张军. 高频及低频重复经颅磁刺激对急性一氧化碳中毒迟发性脑病的疗效[J/OL]. 中华脑科疾病与康复杂志(电子版), 2025, 15(04): 199-207.

Yuanyuan Jin, Limei Liu, Yan Huang, Jun Zhang. Therapeutic effect of high-frequency and low-frequency repetitive transcranial magnetic stimulation on delayed encephalopathy after acute carbon monoxide poisoning[J/OL]. Chinese Journal of Brain Diseases and Rehabilitation(Electronic Edition), 2025, 15(04): 199-207.

目的

观察高频及低频重复经颅磁刺激(rTMS)治疗对急性一氧化碳(CO)中毒迟发性脑病(DEACMP)实验鼠的脑源性神经营养因子(BDNF)/酪氨酸激酶受体B(TrkB)信号通路的表达及MBP含量的影响并探讨疗效。

方法

采用Morris水迷宫筛选出24只认知合格的SD大鼠,采用随机数字表法选取6只为空白组(NC组),余18只建立DEACMP模型后随机分为假刺激组(Sham组)、高频治疗组(5 Hz组)及低频治疗组(1 Hz组),每组6只。高频、低频治疗组分别给予5、1 Hz rTMS治疗,Sham组给予假刺激。治疗后通过Morris水迷宫评估实验鼠的认知功能。采用苏木素-伊红(HE)染色法观察实验鼠海马区的损伤情况,酶联免疫吸附法(ELISA)分析BDNF、TrkB、髓鞘碱性蛋白质(MBP)血清浓度,免疫组织化学(IHC)染色法检测BDNF、TrkB、MBP阳性表达。

结果

(1)Morris水迷宫结果:CO中毒21 d,平均逃避潜伏期比较,NC组<5 Hz组<1 Hz组<Sham组,差异均有统计学意义(P<0.05)。(2)HE染色结果:NC组海马区细胞排列齐整、界清且胞数正常,Sham组海马区细胞排列紊乱、胞数减少且部分出现核固缩坏死,1 Hz组、5 Hz组海马区细胞排列较为齐整,偶有细胞坏死。(3)ELISA分析结果:与NC组相比,Sham组的BDNF和TrkB表达含量降低,MBP表达含量上升,差异均有统计学意义(P<0.05);1 Hz组和5 Hz组的BDNF、TrkB表达含量较Sham组明显上升,MBP表达含量较Sham组明显降低,差异均有统计学意义(P<0.05)。(4)IHC染色结果:与NC组相比,Sham组中BDNF和TrkB的平均光密度值降低,差异均有统计学意义(P<0.05);1 Hz组和5 Hz组BDNF、TrkB的平均光密度值均高于Sham组,差异均有统计学意义(P<0.05);Sham组的MBP平均光密度值明显高于NC组,1 Hz组和5 Hz组的MBP平均光密度值均低于Sham组,差异均有统计学意义(P<0.05)。

结论

高频(5 Hz)和低频(1 Hz)的rTMS均可改善DEACMP实验鼠的认知功能,可能作用机制是通过上调BDNF/TrkB通路表达改善脱髓鞘病变,使MBP的表达含量降低,从而提升认知能力。

Objective

To observe the effects of high-frequency and low-frequency repetitive transcranial magnetic stimulation (rTMS) treatment on the expression of brain-derived neurotrophic factor (BDNF)/tyrosine kinase receptor B (TrkB) signalling pathway and MBP content in rats with delayed encephalopathy in acute carbon monoxide poisoning (DEACMP) and to explore the therapeutic effects.

Methods

Cognitively qualified male 24 SD rats were screened by Morris water maze, 6 were randomly selected as the blank group (NC group), and 18 were randomly divided into the sham stimulation group (Sham group), the high frequency 5 Hz group (5 Hz group), and the low frequency 1 Hz group (1 Hz group), each with 6 rats in each group, after the establishment of the DEACMP model. The treatment group was given 5 Hz and 1 Hz rTMS treatment respectively, and the Sham group was given sham stimulation. Cognitive function was assessed by Morris water maze after treatment. Hematoxylin-eosin (HE) staining was used to observe the changes in the hippocampal region of rats; enzyme-linked immunosorbent assay (ELISA) was used to analyse the serum concentration of BDNF, TrkB and myelin basic protein (MBP); immunohistochemical staining (IHC) was used to detect the positive expression of BDNF, TrkB and MBP in each group.

Results

(1) The results of Morris water maze showed that 21 d after CO poisoning, the mean avoidance latency was significantly longer in the Sham group, 1 Hz group and 5 Hz group compared with the NC group (P<0.05); the mean avoidance latency was significantly shorter in the 1 Hz and 5 Hz groups compared with that in the Sham group (P<0.05); and the mean avoidance latency was even shorter in the 5 Hz group compared with that in the 1 Hz group (P<0.05). (2) The results of HE staining showed that the cells in the hippocampus of the NC group were neatly arranged, with clear boundaries and normal cell number, while the cells in the hippocampus of the Sham group were disorganised, with a reduced cell number and some of them showed nuclear necrosis. The hippocampal area of the 1 Hz and 5 Hz groups was more neatly arranged, with occasional cell necrosis. (3) The ELISA results indicated that compared with the NC group, the expression content of BDNF and TrkB in the Sham group decreased, and the expression content of MBP increased (P<0.05); in the 1 Hz and 5 Hz groups, the expression content of BDNF and TrkB increased significantly compared with that of the Sham group, and the expression content of MBP increased significantly compared with that of the Sham group. MBP expression content was significantly lower than that in the Sham group (P<0.05). (4) IHC staining indicated that the mean optical density values of BDNF and TrkB in the Sham group were decreased compared with that in the NC group (P<0.05); the mean optical density values of BDNF and TrkB in both the 1 Hz group and the 5 Hz group were higher than that in the Sham group (P<0.05); the MBP mean optical density values of BDNF and TrkB in the Sham group and the 5 Hz group were higher than those in the Sham group (P<0.05); the mean optical density values of MBP in the Sham group were significantly higher than those in the NC group, and the mean optical density values of MBP in the 1 Hz and 5 Hz groups were lower than those in the Sham group (P<0.05).

Conclusions

Both high-frequency (5 Hz) and low-frequency (1 Hz) rTMS can improve the cognitive function of DEACMP mice, and the possible mechanism is to improve demyelinating lesions by up-regulating the expression of BDNF/TrkB pathway, so as to reduce the expression content of MBP, thus improving cognitive ability.

表1 4组实验鼠Morris水迷宫平均逃避潜伏期比较(s,mean±SD
Tab.1 Comparison of average escape latency in Morris water maze among 4 groups (s, mean±SD)
图1 4组实验鼠脑海马组织HE染色结果(×200)A:NC组;B:Sham组,大部分核出现固缩坏死(箭头所示);C~D:1 Hz组(C)和5 Hz组(D)偶见细胞坏死(箭头所示)
Fig.1 HE staining results of hippocampal tissue in 4 groups (×200)
表2 4组实验鼠血清中BDNF、TrkB、MBP表达水平比较(ng/mL,mean±SD
Tab.2 Expression levels of BDNF, TrkB and MBP in serum of experimental rats (ng/mL, mean±SD)
表3 4组实验鼠rTMS治疗14 d后海马组织BDNF、TrkB、MBP的平均光密度值比较(mean±SD
Tab.3 Comparison of the average optical density of BDNF, TrkB and MBP in hippocampus of four groups of experimental rats after rTMS treatment for 14 d (mean±SD)
图2 IHC检测4组实验鼠rTMS治疗14 d后海马组织BDNF表达水平(×200)A:NC组;B:Sham组;C:1 Hz组;D:5 Hz组;HE染色中胞核为蓝色,DAB染色中阳性表达呈现棕黄色;箭头所示为BDNF的阳性表达;BDNF:脑源性神经营养因子;rTMS:重复经颅磁刺激;IHC:免疫组织化学
Fig.2 IHC was used to detect BDNF expression in hippocampus of four groups of experimental rats after rTMS treatment for 14 d (×200)
图3 IHC检测4组实验鼠rTMS治疗14 d后海马组织TrkB表达水平(×200)A:NC组;B:Sham组;C:1 Hz组;D:5 Hz组;HE染色中胞核为蓝色,DAB染色中阳性表达呈现棕黄色;箭头所示为TrkB的阳性表达;TrkB:酪氨酸激酶受体B;rTMS:重复经颅磁刺激;IHC:免疫组织化学
Fig.3 IHC was used to detect TrkB expression in hippocampus of four groups of experimental rats after rTMS treatment for 14 d (×200)
图4 IHC检测4组实验鼠rTMS治疗14 d后海马组织MBP表达水平(×200)A:NC组;B:Sham组;C:1 Hz组;D:5 Hz组;HE染色中胞核为蓝色,DAB染色中阳性表达呈现棕黄色;箭头所示为MBP的阳性表达;MBP:髓鞘碱性蛋白质;rTMS:重复经颅磁刺激;IHC:免疫组织化学
Fig.4 IHC was used to detect MBP expression in hippocampus of four groups of experimental rats after rTMS treatment for 14 d (×200)
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