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南京中医药大学 中医学院 中西医结合学院,南京 210046
Received:19 July 2021,
Published Online:26 October 2021,
Published:05 January 2022
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王紫薇,周西彬,邓菊等.苓桂术甘汤对阿尔茨海默病血脑屏障损伤的影响[J].中国实验方剂学杂志,2022,28(01):16-23.
WANG Zi-wei,ZHOU Xi-bin,DENG Ju,et al.Mechanism of Linggui Zhugantang in Repairing Blood-brain Barrier Injury of Alzheimer's Disease[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(01):16-23.
王紫薇,周西彬,邓菊等.苓桂术甘汤对阿尔茨海默病血脑屏障损伤的影响[J].中国实验方剂学杂志,2022,28(01):16-23. DOI: 10.13422/j.cnki.syfjx.20212404.
WANG Zi-wei,ZHOU Xi-bin,DENG Ju,et al.Mechanism of Linggui Zhugantang in Repairing Blood-brain Barrier Injury of Alzheimer's Disease[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(01):16-23. DOI: 10.13422/j.cnki.syfjx.20212404.
目的
2
通过观察苓桂术甘汤(LG)对体外阿尔茨海默病(AD)病理状态下血脑屏障模型的影响,探讨其对AD血脑屏障损伤后修复的具体机制。
方法
2
将50只雄性SPF级大鼠,随机分为5组,分别灌胃7 d,2次/d,LG高、中、低剂量组以4.8,2.4,1.2 g·kg
-1
,西药组以盐酸多奈哌齐0.5 mg·kg
-1
,正常组以等体积生理盐水灌胃,末次灌胃1 h后经腹主动脉取含药血清;以细胞共培养法构建AD体外血脑屏障损伤模型,实验分为正常组,模型组,LG高、中、低剂量组和盐酸多奈哌齐组,模型组加入
β
淀粉样蛋白1-42(A
β
1-42
)100 μL,终浓度为5 μmol·L
-1
,LG高、中、低剂量组以及盐酸多奈哌齐组在模型组基础上分别加入10%含药血清。通过噻唑蓝(MTT)比色法检测各组细胞存活率;采用蛋白免疫印迹法(Western blot)测定各组血脑屏障相关骨架蛋白跨膜密蛋白-5(Claudin-5),外周支架蛋白-1(ZO-1),闭合蛋白(Occludin),基质金属蛋白酶-2(MMP-2),基质金属蛋白酶-9(MMP-9)的表达;采用酶联免疫吸附测定法(ELISA)检测炎症因子白细胞介素-1
β
(IL-1
β
),IL-6,肿瘤坏死因子-
α
(TNF-
α
)的含量变化;采用实时荧光定量聚合酶链式反应(Real-time PCR)和Western blot检测LG高、中、低剂量组血脑屏障不同时间点A
β
转运蛋白低密度脂蛋白受体相关蛋白1(LRP-1)和晚期糖基化终产物受体(RAGE)表达。
结果
2
MTT结果分析显示,与正常组比较,模型组细胞存活率明显下降(
P
<
0.05);与模型组比较,盐酸多奈哌齐组和LG高剂量组细胞存活率明显增强(
P
<
0.05);Western blot结果分析显示,与正常组比较,模型组骨架蛋白显著下调,MMP-2,MMP-9蛋白明显上调(
P
<
0.05);与模型组比较,盐酸多奈哌齐组和LG高剂量骨架蛋白含量明显上调(
P
<
0.05),MMP-2,9水平明显下降(
P
<
0.05);与模型组比较,仅LG中剂量组Claudin-5蛋白水平明显上调(
P
<
0.05),MMP-2水平明显下调(
P
<
0.05);ELISA结果分析显示,与正常组比较,模型组IL-1
β
,IL-6,TNF-
α
含量明显上调(
P
<
0.05);与模型组比较,盐酸多奈哌齐组和LG高、中剂量组IL-1
β
,IL-6,TNF-
α
表达明显下调(
P
<
0.05);PCR结果分析显示,与0 h比较,3 h时LRP-1表达明显上调,RAGE表达明显下调(
P
<
0.05),6,12,24,36 h后LRP-1,RAGE表达逐渐和缓;Western blot结果分析显示,3 h时,与正常组比较,模型组LRP-1含量明显下调,RAGE含量明显上调(
P
<
0.05);与模型组比较,盐酸多奈哌齐组和LG高剂量组LRP-1含量显著上调,RAGE含量明显下调(
P
<
0.05)。
结论
2
LG对AD体外血脑屏障损伤具有修复作用,其机制可能与抑制炎症因子和MMP-2,MMP-9表达、促进骨架蛋白表达并调节转运蛋白平衡相关。
Objective
2
To observe the effect of Linggui Zhugantang (LG) on the blood-brain barrier (BBB) model of Alzheimer's disease (AD)
in vitro
and to explore the mechanism of LG in repairing the BBB injury in AD.
Method
2
A total of 50 male SPF rats were randomized into five groups: high-dose (4.8 g·kg
-1
), medium-dose (2.4 g·kg
-1
), and low-dose (1.2 g·kg
-1
) LG groups, western medicine (0.5 g·kg
-1
donepezil hydrochloride) group, and normal group (normal saline of equivalent volume). They received (
ig
) corresponding drugs twice a day for 7 d. Drug-containing serum was respectively collected from the abdominal aorta 1 h after the last administration. The BBB injury of AD
in vitro
was induced with the cell co-culture method, and 6 groups were designed: normal group, model group, high-, medium-, and low-dose LG groups, and western medicine group. The model group was added with 100 μL amyloid
β
1-42
(A
β
1-42
, final concentration: 5 μmol·L
-1
), and high-dose, medium-dose, and low-dose LG groups and the western medicine group were added with corresponding 10% drug-containing serum in addition to the 100 μL A
β
1-42
(final concentration: 5 μmol·L
-1
). Cell survival rate was detected by methyl thiazolyl tetrazolium (MTT) assay, expression of BBB-related skeleton proteins (claudin-5, ZO-1, occludin), matrix metalloproteinase-2 (MMP-2), and matrix metalloproteinase-9 (MMP-9) by Western blot, and content of inflammatory factors interleukin-1
β
(IL-1
β
), interleukin-6 (IL-6), and tumor necrosis factor-
α
(TNF-
α
) by enzyme-linked immunosorbent assay (ELISA). BBB A
β
transporter low-density lipoprotein receptor-related protein 1 (LRP-1) and advanced glycation end product receptor (RAGE) at different time points in high-dose, medium-dose, and low-dose LG groups were determined by Real-time PCR and Western blot.
Result
2
Cell survival rate of the model group was lower than that of the normal group (
P
<
0.05) and the survival rates of the western medicine group and high-dose LG group was higher than that in the model group (
P
<
0.05). The skeleton proteins were down-regulated and MMP-2 and MMP-9 were up-regulated in the model group compared with those in the normal group (
P
<
0.05). The expression of skeleton proteins was higher (
P
<
0.05) and that of MMP-2 and MMP-9 was lower (
P
<
0.05) in the western medicine group and high-dose LG group than in the model group. Compared with the model group, only the medium-dose LG group showed the up-regulation (
P
<
0.05) of claudin-5 (
P
<
0.05) and the decrease (
P
<
0.05) of MMP-2. IL-1
β
, IL-6, and TNF-
α
in the model group were up-regulated (
P
<
0.05) compared with those in the normal group, and those inflammatory factors in the western medicine group and high-dose and medium-dose LG groups were lower (
P
<
0.05) than those in the model group. LRP-1 expression was up-regulated and RAGE expression was down-regulated at 3 h compared with those at 0 h (
P
<
0.05), while the expression of the two became stable at 6, 12, 24, 36 h. At 3 h, LRP-1 expression was down-regulated and RAGE expression was up-regulated in model group compared with those in the normal group at 3 h (
P
<
0.05). Moreover, the LRP-1 content was higher and RAGE content was lower in the western medicine group and high-dose LG group than in the model group.
Conclusion
2
LG can repair the BBB injury
in vitro
by inhibiting the expression of inflammatory factors and MMP-2, MMP-9, promoting the expression of skeletal proteins, and regulating the balance of transporters.
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