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1.江西中医药大学,南昌 330004
2.江西中医药大学 中医学院,生命科学院,南昌 330004
[第一作者] 杨晶莹,在读硕士,从事中药神经保护研究,Tel:0791-87118907, E-mail: 1025621996@qq.com
*肖移生,硕士,副教授,从事中药神经保护研究,Tel:0791-7118907, E-mail: xys760928@sina.com
收稿日期:2019-07-17,
网络出版日期:2019-10-17,
纸质出版日期:2020-03-20
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杨晶莹, 肖移生, 姜劼琳, 等. 黄精丸对阿尔茨海默病大鼠大脑的抗氧化作用及A
Jing-ying YANG, Yi-sheng XIAO, Jie-lin JIANG, et al. Effect of Huangjingwan on Antioxidant Functions and A
杨晶莹, 肖移生, 姜劼琳, 等. 黄精丸对阿尔茨海默病大鼠大脑的抗氧化作用及A
Jing-ying YANG, Yi-sheng XIAO, Jie-lin JIANG, et al. Effect of Huangjingwan on Antioxidant Functions and A
目的:
2
探讨黄精丸药方(Huangjingwan,HW)对阿尔茨海默病(AD)大鼠大脑的抗氧化作用及
β
-淀粉样多肽1-42(A
β
1-42
),淀粉样前体蛋白(APP)表达的影响。
方法:
2
SD大鼠随机分成正常组,假手术组,AD模型组,HW低、中、高剂量组(相当药丸剂量1,3,9 g·kg
-1
·d
-1
组)。给大鼠腹腔注射1.25%
D
-半乳糖液(120 mg·kg
-1
·d
-1
,连续6周)后,再右侧脑室一次性注射A
β
1-42
10 μg,制作大鼠AD模型;造模2周后各药物组大鼠灌胃相应剂量试验药物,假手术组及AD模型组大鼠灌胃给生理盐水1 mL,每天1次。灌胃持续8周。采用跳台实验评价各大鼠的学习记忆能力;体质量10%的负荷游泳实验测试各大鼠的体能耐力变化;比色法检测各大鼠大脑组织超氧化物歧化酶(SOD),谷胱甘肽还原酶(GR),谷胱甘肽过氧化物酶(GSH-Px)抗氧化酶系活性,谷胱甘肽(GSH)与丙二醛(MDA)含量变化;酶联免疫吸附测定(ELISA)检测各大鼠大脑组织白细胞介素-1
β
(IL-1
β
),肿瘤坏死因子-
α
(TNF-
α
),A
β
1-42
与APP蛋白含量变化;蛋白免疫印迹法(Western blot)检测各大鼠大脑APP蛋白表达变化。
结果:
2
与正常组比较,AD模型组大鼠表现出明显的痴呆状态,少动易呆卧,学习反应时间延长,学习记忆错误次数显著增多,体能衰减明显,大脑内抗氧化酶(SOD,GR,GSH-Px)活性及抗炎因子GSH水平显著降低,炎症因子MDA,IL-1
β
,TNF-
α
水平显著升高,A
β
1-42
蛋白含量显著升高,APP蛋白含量显著下降(
P
<
0.01)。与AD模型组比较,HW低、中、高剂量均可改善AD大鼠的痴呆症状,提高学习记忆成绩,改善机体虚弱、提高体能,升高大脑内SOD,GR,GSH-Px活性及抗炎因子GSH水平,降低MDA,IL-1
β
,TNF-
α
水平,并能降低大脑内A
β
1-42
及升高APP蛋白水平(
P
<
0.05,
P
<
0.01);且1~9 g·kg
-1
·d
-1
剂量范围内的HW,随剂量增加,药效作用越明显。
结论:
2
HW有防治AD的功能,这一作用与HW可以增强脑内抗氧化系统功能、降低神经炎症反应、降低氧化应激引发的A
β
1-42
沉积、维持APP蛋白表达水平等有关。
Objective:
2
To observe the effect of Huangjingwan (HW) on antioxidant functions and
β
-amyloid 1-42 (A
β
1-42
) and amyloid precursor protein (APP) expressions in the brain of Alzheimer' s disease (AD) rats.
Method:
2
SD rats were randomly divided into normal control group
sham model control group
AD model group
and low
medium
high-dose (equivalent raw drug dose 1
3
9 g·kg
-1
·d
-1
) HW groups.The AD models were established through intraperitoneal injection with 1.25%
D
-galactose (120 mg·kg
-1
·d
-1
6 consecutive weeks) and then one-time right ventricular injection with A
β
1-42
(10 μg). Two weeks after modeling
the rats in each HW group received corresponding drugs through intragastric administration
once a day
while the rats in sham model control group
AD model group were given normal saline 1 mL through intragastric administration
once a day.Gastric perfusion lasted for 8 weeks.At the end of the experiment
learning and memory abilities of the rats were assessed by Platform Jumping Test.The changes of physical endurance in rats were tested by 10% weight swimming under load.The activities of superoxide dismutase (SOD)
glutathione reductase (GR)
glutathione peroxidase (GSH-Px) antioxidant enzymes and the contents of glutathione (GSH) and malondialdehyde (MDA) in rat brain tissue were detected by colorimetry.The changes of interleukin-1
β
(IL-1
β
)
tumor necrosis factor-
α
(TNF-
α
)
A
β
1-42
and APP protein in rat brain tissues were determined by enzyme linked immunosorbent assay (ELISA). Western blot analysis was used to measure the expression of APP protein in rat brain.
Result:
2
Compared with the normal control group
rats in AD model group showed an obvious dementia state
that is more lying and less movement
longer learning response time
significant increase in the number of learning and memory errors
significant attenuation in physical fitness
significant decrease in the activities of antioxidant enzymes (SOD
GR
GSH-Px) and anti-inflammatory factors GSH in brain
significant rise in the levels of inflammatory factors MDA
IL-1
β
and TNF-
α
and the content of A
β
1-42
protein
and significant reduction in the content of APP protein in brain (
P
<
0.01). Low
medium and high-dose HW could ameliorate dementia symptoms in AD rats
improve the achievement of learning and memory
antagonize body weakness and increase physical fitness
promote SOD
GR
GSH-Px activities and anti-inflammatory factor GSH level in the brain
reduce the levels of MDA
IL-1
β
and TNF-
α
in the brain
decrease the level of A
β
1-42
and increase the level of APP protein in the brains of AD rats compared with the AD model group (
P
<
0.05
P
<
0.01)
besides
within the dose range of 1-9 g·kg
-1
·d
-1
HW has a more obvious effect with the increase of dose.
Conclusion:
2
HW has the effects in preventing and treating AD
which is related to the HW' s mechanisms in enhancing the function of antioxidant system in brain
reducing neuroinflammatory reaction and deposition of A
β
1-42
induced by oxidative stress
and maintaining the expression level of APP protein.
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