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1.贵州中医药大学,贵阳 550025
2.贵州中医药大学 中药、民族药药理作用及作用机制研究中心,贵阳 550025
3.贵州中医药大学 第一附属医院,贵阳 550002
唐冰雪,在读硕士,从事中药防治心脑血管病药理研究,E-mail:gztbx@163.com
刘明,博士,教授,从事中药、民族药防治心脑血管疾病药理研究,E-mail:393617518@qq.com
收稿日期:2020-03-02,
网络出版日期:2020-07-27,
纸质出版日期:2020-11-20
移动端阅览
唐冰雪,张源文,吴雅晨等.淫羊藿苷对脑缺血再灌注大鼠的神经保护及小胶质细胞TLR4/NF-κB通路的影响[J].中国实验方剂学杂志,2020,26(22):47-52.
TANG Bing-xue,ZHANG Yuan-wen,WU Ya-chen,et al.Effect of Icariin on Neuroprotection of Cerebral Ischemia-reperfusion Rats and TLR4/NF-κB Pathway in Microglia[J].Chinese Journal of Experimental Traditional Medical Formulae,2020,26(22):47-52.
唐冰雪,张源文,吴雅晨等.淫羊藿苷对脑缺血再灌注大鼠的神经保护及小胶质细胞TLR4/NF-κB通路的影响[J].中国实验方剂学杂志,2020,26(22):47-52. DOI: 10.13422/j.cnki.syfjx.20201865.
TANG Bing-xue,ZHANG Yuan-wen,WU Ya-chen,et al.Effect of Icariin on Neuroprotection of Cerebral Ischemia-reperfusion Rats and TLR4/NF-κB Pathway in Microglia[J].Chinese Journal of Experimental Traditional Medical Formulae,2020,26(22):47-52. DOI: 10.13422/j.cnki.syfjx.20201865.
目的
2
探讨淫羊藿苷对脑缺血再灌注大鼠的神经保护及小胶质细胞Toll样受体4(TLR4)/核转录因子-
κ
B(NF-
κ
B)通路的影响。
方法
2
假手术组大鼠只分离不结扎阻塞血管,并予等体积的生理盐水腹腔注射,其余各组采用线栓法复制一侧大脑中动脉脑缺血再灌注模型(MCAO),造模成功后随机分为模型组,丁苯酞组(6 mg·kg
-1
),淫羊藿苷高、中、低(40,20,10 mg·kg
-1
)剂量组,分别于缺血5,12,24 h各腹腔给药1次。进行神经功能评分,2,3,5-三苯基氯化四氮唑(TTC)染色测脑梗死率,免疫组化法检测大鼠脑皮层小胶质细胞标志物海马离子钙结合适配分子1(Iba1)和TLR4的表达,蛋白免疫印迹法(Western blot)检测大脑皮层NF-
κ
B p65表达水平,酶联免疫吸附测定(ELISA)检测炎症因子白细胞介素-1
α
(IL-1
α
),肿瘤坏死因子-
α
(TNF-
α
)含量。
结果
2
与假手术组比较,模型组大鼠神经评分增加、大脑梗死率显著增加,小胶质细胞Iba1,TLR4活化量显著增加,NF-
κ
B p65的蛋白水平上升(
P
<
0.01),炎症因子IL-1
α
,TNF-
α
含量显著增加(
P
<
0.01);经淫羊藿苷治疗后,与模型组比较,大鼠神经功能评分、脑梗死率均有改善,小胶质细胞Iba1,TLR4活化量减少,NF-
κ
B p65的蛋白水平下降,炎症因子IL-1
α
,TNF-
α
含量明显下降(
P
<
0.05,
P
<
0.01)。
结论
2
淫羊藿苷可能是通过调控小胶质细胞的活化,抑制TLR4及其下游NF-
κ
B信号通路的活化,降低相关炎症因子IL-1
α
,TNF-
α
的表达,发挥卒中后的脑保护作用。
Objective
2
To investigate the effect of icariin on neuroprotection in cerebral ischemia-reperfusion rats and microglia toll-like receptor 4 (TLR4)/nuclear transcription factor-
κ
B (NF-
κ
B) pathway.
Method
2
In the blank group, blood vessels were only isolated but not ligated and blocked,and the rats were injected intraperitoneally with the same volume of normal saline. After successful modeling, they were randomly divided into model group, butyphthalide group (6 mg·kg
-1
), and high, medium and low (40,20,10 mg·kg
-1
)-dose icariin group,and abdominally administered with drugs at 5,12, 24 h after ischemia, respectively. The nerve function scores were detected, 2,3,5-triphenyltetrazole chloride (TTC) staining was used to measure the cerebral infarction rate,immunohistochemical assay was performed to detect the expressions of microglial markers ionized calcium binding adapter molecule 1(Iba1) and TLR4 in the rat brain cortex, Western blot immunoassay was used to detect the expression of NF-
κ
B p65 in the cerebral cortex, and enzyme-linked immunosorbent assay (ELISA) was used to detect interleukin-1
α
(IL-1
α
) and tumor necrosis factor-
α
(TNF-
α
) content.
Result
2
Compared with the sham-operation group, the nerve score, the cerebral infarction rate, the activations of Iba1 and TLR4 in microglial cells, the protein expression of NF-
κ
B p65(
P
<
0.01), and the contents of inflammatory factors IL-1
α
and TNF-
α
in the model group increased significantly(
P
<
0.01). After treatment with icariin, compared with the model group, the neurological function score and the cerebral infarction rate of rats were improved, whereas the activations of Iba1 and TLR4 in microglia, the protein expression of NF-
κ
B p65, and the contents of inflammatory factors IL-1
α
and TNF-
α
decreased obviously(
P
<
0.05,
P
<
0.01).
Conclusion
2
Icariin may inhibit the activations of TLR4 and its downstream NF-
κ
B signaling pathway and reduce the expression of relevant inflammatory factors IL-1
α
and TNF-
α
by regulating the activation of microglia, so as to play a protective role in the brain after stroke.
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