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湖南中医药大学 中医诊断学湖南省重点实验室,长沙 410208
Received:26 July 2020,
Published Online:09 November 2020,
Published:05 January 2021
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陈岩岩,李花,刘旺华等.加味四君子汤通过调控Fibulin-5,p-Akt表达抗脑缺血大鼠神经细胞失巢凋亡机制[J].中国实验方剂学杂志,2021,27(01):112-120.
CHEN Yan-yan,LI Hua,LIU Wang-hua,et al.Mechanism of Modified Si Junzitang on Neuronal Anti-anoikis of Cells in Rats with Cerebral Ischemia Through Fibulin-5 and p-Akt[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(01):112-120.
陈岩岩,李花,刘旺华等.加味四君子汤通过调控Fibulin-5,p-Akt表达抗脑缺血大鼠神经细胞失巢凋亡机制[J].中国实验方剂学杂志,2021,27(01):112-120. DOI: 10.13422/j.cnki.syfjx.20210139.
CHEN Yan-yan,LI Hua,LIU Wang-hua,et al.Mechanism of Modified Si Junzitang on Neuronal Anti-anoikis of Cells in Rats with Cerebral Ischemia Through Fibulin-5 and p-Akt[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(01):112-120. DOI: 10.13422/j.cnki.syfjx.20210139.
目的
2
探讨加味四君子汤对大鼠脑缺血再灌注(I/R)损伤后缺血侧海马区脑组织纤维蛋白-5(Fibulin-5),磷酸化蛋白激酶B(p-Akt)的表达及对神经细胞失巢凋亡的影响。
方法
2
将60只SPF级雄性SD大鼠随机分为假手术组、模型组、依达拉奉组(3.2 mg·kg
-1
),加味四君子汤高、中、低剂量组(19.08,9.54,4.77 g·kg
-1
)。采用线栓法制备大鼠大脑中动脉栓塞(MCAO)模型,7 d后处死大鼠,处死前进行神经功能缺损评分,采用苏木素-伊红(HE)染色进行组织病理学观察,原位末端标记法(TUNEL)染色检测神经细胞凋亡指数,免疫组化法和蛋白免疫印迹法(Western blot)检测缺血侧海马区脑组织Fibulin-5及p-Akt蛋白表达情况。
结果
2
神经功能缺损评分结果显示,与假手术组比较,模型组大鼠神经功能缺损评分显著升高(
P
<
0.01);与模型组比较,依达拉奉组、加味四君子汤高、中、低剂量组大鼠神经功能缺损评分均明显降低(
P
<
0.05,
P
<
0.01)。免疫组化结果显示,与假手术组比较,模型组大鼠Fibulin-5,p-Akt蛋白表达,神经细胞凋亡指数均明显增高(
P
<
0.05,
P
<
0.01);与模型组比较,依达拉奉组、加味四君子汤高、中、低剂量组大鼠Fibulin-5,p-Akt蛋白表达均明显增加(
P
<
0.05,
P
<
0.01),神经细胞凋亡指数均明显降低(
P
<
0.05,
P
<
0.01)。Western blot结果显示,与假手术组比较,模型组Fibulin-5,p-Akt蛋白相对表达显著下调(
P
<
0.01);与模型组比较,依达拉奉组、加味四君子汤高、中、低剂量组Fibulin-5,p-Akt蛋白表达均明显上升(
P
<
0.05,
P
<
0.01)。
结论
2
加味四君子汤可能通过稳定神经元细胞外基质(ECM)Fibulin-5,从而增加了ECM对细胞的黏附作用,促进p-Akt蛋白的表达,从而抑制神经细胞凋亡,保护脑缺血损伤。
Objective
2
To investigate the effect of modified Si Junzitang on the expression of fibrous protein-5(Fibulin-5), phosphorylated protein kinase B(p-Akt )in hippocampus of rats after cerebral ischemia-reperfusion (I/R) injury and the anoikis of nerve cells.
Method
2
The 60 male SD rats of SPF grade were randomly divided into sham operation group, model group, Edaravone group (3.2 mg·kg
-1
)and modified Si Junzitang high, medium and low-dose groups(19.08,9.54,4.77 g·kg
-1
).The middle cerebral artery occlusion (MCAO) model was established by suture method,the rats were killed 7 days later,neurological deficit score was evaluated before the death,histopathological observation was performed by hematoxylin eosin staining, apoptosis index of nerve cells was detected by TdT-mediated dUTP nick end labeling(TUNEL)staining, the expression of Fibulin-5, p-Akt and protein in ischemic hippocampus were detected by immunohistochemistry and Western blot.
Result
2
The neurological deficit score showed that,compared with the sham operation group, the neurological deficit score of the model group was significantly increased (
P
<
0.01), compared with model group, the neurological deficit score of Edaravone group,the high, medium, low dose groups of modified Si Junzitang were decreased (
P
<
0.05,
P
<
0.01). Immunohistochemical results showed that,compared with the sham operation group, the expression of Fibulin-5, p-Akt protein and the apoptosis index of nerve cells in the model group were significantly increased (
P
<
0.05,
P
<
0.01), compared with model group, the protein expressions of Fibulin-5 and p-Akt in Edaravone group, high, medium and low-dose groups of modified Si Junzitang were significantly increased (
P
<
0.05,
P
<
0.01), and the apoptosis index of nerve cells was obvious,there was a significant decrease (
P
<
0.05,
P
<
0.01). Western blot results showed that,compared with the sham operation group, the relative expression of Fibulin-5 and p-Akt protein in the model group was significantly down-regulated (
P
<
0.01), compared with model group, the protein expressions of Fibulin-5 and p-Akt in the Edaravone group, the high, medium and low-dose groups of modified Si Junzitang were significantly up-regulated (
P
<
0.05,
P
<
0.01).
Conclusion
2
The modified Si Junzitang may stabilize the extracellular matrix (ECM) Fibulin-5, increase the adhesion of ECM to cells and promote the expression of p-Akt protein, thus inhibiting neuronal apoptosis and protecting cerebral ischemia injury.
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