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1.甘肃中医药大学,兰州 730000
2.甘肃省中医方药挖掘与创新转化重点实验室,兰州 730000
3.甘肃省中药新产品创制工程实验室,兰州 730000
王虎平,博士,副教授,博士生导师,从事中医复方物质基础及作用机制研究,E-mail:whp@gszy.edu.cn
收稿日期:2024-04-23,
网络出版日期:2024-06-21,
纸质出版日期:2024-09-05
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王虎平,陈怡琴,杨娇等.黑逍遥散调控Fas/FasL/Caspase-8/Caspase-3信号通路对AD大鼠神经元细胞凋亡的影响[J].中国实验方剂学杂志,2024,30(17):18-26.
WANG Huping,CHEN Yiqin,YANG Jiao,et al.Hei Xiaoyaosan Regulates Fas/FasL/Caspase-8/Caspase-3 Signaling Pathway to Inhibit Neuronal Apoptosis in AD Rats[J].Chinese Journal of Experimental Traditional Medical Formulae,2024,30(17):18-26.
王虎平,陈怡琴,杨娇等.黑逍遥散调控Fas/FasL/Caspase-8/Caspase-3信号通路对AD大鼠神经元细胞凋亡的影响[J].中国实验方剂学杂志,2024,30(17):18-26. DOI: 10.13422/j.cnki.syfjx.20240843.
WANG Huping,CHEN Yiqin,YANG Jiao,et al.Hei Xiaoyaosan Regulates Fas/FasL/Caspase-8/Caspase-3 Signaling Pathway to Inhibit Neuronal Apoptosis in AD Rats[J].Chinese Journal of Experimental Traditional Medical Formulae,2024,30(17):18-26. DOI: 10.13422/j.cnki.syfjx.20240843.
目的
2
探究黑逍遥散调控肿瘤坏死因子受体超家族成员6(Fas)/Fas配体(FasL)/胱天蛋白酶-8(Caspase-8)/胱天蛋白酶-3(Caspase-3)信号通路干预神经元细胞凋亡防治阿尔茨海默病(AD)的作用及机制。
方法
2
选用4月龄SPF级SD雄性大鼠90只,随机选取10只作为空白组,10只作为假手术组(双侧海马各注射生理盐水1 μL),其余70只双侧海马各注射
β
淀粉样蛋白1-42(A
β
1-42
)1 μL溶液复制AD模型。筛选出造模成功的大鼠50只,随机分为模型组、盐酸多奈哌齐组(0.45 mg·kg
-1
)及黑逍遥散高、中、低剂量组(15.30、7.65、3.82 g·kg
-1
)。连续灌胃42 d,1次/d。原位末端标记法(TUNEL)染色观察大鼠皮层和海马神经元细胞凋亡情况,免疫组化法(IHC)检测大鼠海马组织B细胞淋巴瘤-2(Bcl-2)、Bcl-2相关X蛋白(Bax)表达,实时荧光定量聚合酶链式反应(Real-time PCR)检测Fas、FasL、Fas相关死亡结构域蛋白(Fadd) mRNA表达,蛋白免疫印迹法(Western blot)检测Fas、FasL、Fadd、Caspase-3、切割型(cleaved)Caspase-3、Caspase-8、cleaved Caspase-8相关蛋白的表达。
结果
2
与空白组和假手术组比较,模型组大鼠皮层和海马区细胞凋亡率显著升高(
P
<
0.01),Bax水平显著增高(
P
<
0.01),Bcl-2水平显著下调(
P
<
0.01),海马组织Fas、FasL、Fadd mRNA表达显著提高(
P
<
0.01),Fas、FasL、Fadd、cleaved Caspase-3、cleaved Caspase-8蛋白表达显著增高(
P
<
0.01);与模型组比较,盐酸多奈哌齐组及黑逍遥散高、中剂量组大鼠皮层和海马区细胞凋亡率明显下降(
P
<
0.05,
P
<
0.01),Bax水平显著降低(
P
<
0.01),Bcl-2水平显著提高(
P
<
0.01),海马组织Fas、FasL、Fadd mRNA表达明显下调(
P
<
0.05,
P
<
0.01),Fas、FasL、Fadd、cleaved Caspase-3、cleaved Caspase-8蛋白表达显著下调(
P
<
0.01);黑逍遥散低剂量组大鼠皮层和海马区细胞凋亡率明显下降(
P
<
0.05,
P
<
0.01),Bcl-2表达水平显著降低(
P
<
0.01),海马组织FasL、Fadd mRNA表达明显下调(
P
<
0.05),Fas、FasL、Fadd、cleaved Caspase-3、cleaved Caspase-8蛋白表达明显下调(
P
<
0.05)。
结论
2
黑逍遥散可保护AD大鼠皮层和海马区神经元细胞凋亡,其作用机制可能与抑制Fas/FasL/Caspase-8/Caspase-3信号通路介导的细胞凋亡有关。
Objective
2
To explore the effect and mechanism of Hei Xiaoyaosan in regulating the tumor necrosis factor receptor superfamily member 6 (Fas)/Fas ligand (FasL)/cysteine protease-8 (Caspase-8)/cysteine protease-3 (Caspase-3) signaling pathway to intervene in neuronal apoptosis and prevent Alzheimer's disease (AD).
Method
2
Ninety SPF-grade SD male rats of 4 months old were selected and randomly grouped as follows: 10 rats in the blank group, 10 rats in the sham group (bilateral hippocampus injected with 1 μL normal saline), and 70 rats in the modeling group [bilater hippocampus injected with 1 μL amyloid-beta protein 1-42 (A
β
1-42
) solution for the modeling of AD]. Fifty successfully modeled rats were selected and randomly assigned into model, donepezil hydrochloride (0.45 mg·kg
-1
), and high-, medium-, and low-dose (15.30, 7.65, 3.82 g·kg
-1
) Hei Xiaoyaosan groups. Rats were administrated with corresponding agents by gavage once a day for 42 days. Terminal-deoxynucleoitidyl transferase-mediated nick end labeling (TUNEL) was employed to observe the apoptosis of neurons in the cortex and hippocampus, and immunohistochemistry (IHC) was used to detect the expression of B-cell lymphoma-2 (Bcl-2) and Bcl-2-associated X protein (Bax) in the hippocampus. Real-time fluorescence quantitative polymerase chain reaction(Real-time PCR) was employed to determine the mRNA levels of Fas, FasL, and Fas-associated protein with death domain (Fadd). Western blot was used to determine the protein levels of Fas, FasL, Fadd, Caspase-3, cleved Caspase-3, Caspase-8, and cleved Caspase-8.
Result
2
Compared with the blank group and sham group, the model group showed increased apoptosis rate in the cortex and hippocampus (
P
<
0.01), elevated Bax level (
P
<
0.01), lowered Bcl-2 level (
P
<
0.01), up-regulated mRNA levels of Fas, FasL, and Fadd in the hippocampus (
P
<
0.01), and up-regulated protein levels of Fas, FasL, Fadd, cleaved Caspase-3, and cleaved Caspase-8 (
P
<
0.01). Compared with the model group, donepezil hydrochloride and Hei Xiaoyaosan at high and medium doses decreased the apoptosis rate in the cortex and hippocampus (
P
<
0.05,
P
<
0.01), lowered the Bax level (
P
<
0.01), elevated the Bcl-2 level (
P
<
0.01), and down-regulated the mRNA levels of Fas, FasL, and Fadd and the protein levels of Fas, FasL, Fadd, cleaved Caspase-3, and cleaved Caspase-8 (
P
<
0.05,
P
<
0.01) in the hippocampus. Low-dose Hei Xiaoyaosan decreased the apoptosis rate in the cortex and hippocampus (
P
<
0.05,
P
<
0.01), lowered the Bcl-2 level (
P
<
0.01), and down-regulated the mRNA levels of FasL and Fadd (
P
<
0.05) and the protein levels of Fas, FasL, Fadd, cleaved Caspase-3, and cleaved Caspase-8 (
P
<
0.05) in the hippocampus.
Conclusion
2
Hei Xiaoyaosan can protect neurons in the cortex and hippocampus of AD rats by inhibiting the apoptosis mediated by the Fas/FasL/Caspase-8/Caspase-3 signaling pathway.
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