EGCG-Zn对血管性痴呆大鼠学习记忆及抗氧化能力的影响
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篇名: | EGCG-Zn对血管性痴呆大鼠学习记忆及抗氧化能力的影响 |
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摘要: | 目的:研究表没食子儿茶素没食子酸酯(EGCG)与锌离子螯合得到的EGCG-Zn对血管性痴呆(VD)大鼠的学习记忆及抗氧化能力的影响。方法:将大鼠随机分为假手术组、模型组、葡萄糖酸锌组(阳性对照,70 mg/kg)、EGCG组(5 mg/kg)和EGCG-Zn低、中、高剂量组(2、5、10 mg/kg),每组10只。采用大脑中动脉闭塞法制备VD模型,造模7 d后每天ig相应药物1次,连续28 d。采用Morris水迷宫实验评价各组大鼠的空间学习和记忆能力,分光光度比色法检测各组大鼠脑组织中超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GSH-Px)活性及丙二醛(MDA)含量。结果:与假手术组比较,模型组大鼠逃避潜伏期延长,平台象限游泳距离百分比(dP/dT)降低(P<0.01);脑组织中SOD、CAT、GSH-Px活性降低,MDA含量增加(P<0.01)。与模型组比较,EGCG组和EGCG-Zn各剂量组大鼠记录第4天的逃避潜伏期明显缩短,dP/dT明显升高(P<0.05或P<0.01);脑组织中SOD、CAT、GSH-Px活性增强,MDA含量减少(P<0.05或P<0.01),且呈剂量依赖性。与EGCG组和葡萄糖酸锌组比较,EGCG-Zn各剂量组大鼠逃避潜伏期缩短,dP/dT升高;脑组织中SOD、CAT、GSH-Px活性增强,MDA含量减少,以高、中剂量组效果较明显(P<0.05或P<0.01)。结论:EGCG-Zn可以提高VD大鼠的学习记忆能力和抗氧化能力,且效果优于EGCG。 |
ABSTRACT: | OBJECTIVE: To study the effect of EGCG-Zn chelated by epigallocatechin gallate (EGCG) and Zn ion on learning, memory and antioxidant abilities in vascular dementia (VD) rats. METHODS: Rats were randomly divided into sham group, model group, zinc gluconate group (positive control, 70 mg/kg), EGCG group (5 mg/kg), and EGCG-Zn low-dose, middle-dose, high-dose groups (2, 5, 10 mg/kg), 10 in each group. The VD models were induced by middle cerebral artery occlusion. The rats were intragastrically given relevant medicines after 7 d of modeling, once a day, for 28 d. Morris water maze were used to evaluate learning and memory abilities of rats. Spectrophotometric method was adopted to detect the superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-Px) activities and malondialdehyde (MDA) content in brain tissue of rats. RESULTS: Compared with sham group, escape latency was extended in model group, percentage of platform quadrant swimming distance (dP/dT) was reduced (P<0.01); SOD, CAT, GSH-Px activities in brain tissue were reduced, and MDA content was increased (P<0.01). Compared with model group, escape latency on 4th d of recording was obviously shortened in EGCG group and EGCG-Zn dose groups, dP/dT was obviously increased and dose-depended (P<0.05 or P<0.01); SOD, CAT, GSH-Px activities in brain tissue were increased, MDA content was decreased (P<0.05 or P<0.01) and dose-depended. Compared with EGCG group and zinc gluconate group, escape latency was obviously shortened in EGCG-Zn dose groups, dP/dT was increased; SOD, CAT, GSH-Px activities in brain tissue were increased, MDA content was decreased; and the effects in high-dose, medium-dose groups were more obvious (P<0.05 or P<0.01). CONCLUSIONS: EGCG-Zn can improve the learning, memory and antioxidant abilities in VD rats, and the effect is superior to EGCG. |
期刊: | 2017年第28卷第19期 |
作者: | 郭亚娟,曾坤,郭换营,张校晨,张昀,刘绣华 |
AUTHORS: | GUO Yajuan,ZENG Kun,GUO Huanying,ZHANG Xiaochen,ZHANG Yun,LIU Xiuhua |
关键字: | 表没食子儿茶素没食子酸酯;锌离子;血管性痴呆;大鼠;水迷宫;抗氧化;学习记忆 |
KEYWORDS: | Epigallocatechin gallate; Zn ion; Cascular dementia; Rats; Morris water maze; Antioxidant; Learning and memory |
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