天麻对阿尔茨海默病模型大鼠学习记忆和海马突触传递蛋白表达的影响

摘要

Objective To explore the effect of gastrodia elata on learning and memory abilities and synaptic transmission protein(P38,Ca2+ -CaMK Ⅱ α,CREB)expression of hippocampus in model rats with Alzheimer's disease(AD).Methods 24 adult Wistar rats were randomly divided into control group,test group and intervention group.A dose of Aβ1-40 was injected into the hippocampus of rats on test group and intervention group,the control rats were injected with normal saline.When the models were successful,the rats of control group and test groups were given with sodium carboxymethyl cellulose(50g/kg),the rats of intervention group were given with gastrodia elata powder( 50 g/kg),lasting 15 days,Morris water maze test was used for learning and memory abilities study.The expression of P38,Ca2+-CaMK Ⅱ α and CREB protein were detected by immunohistochemistry method.Results Behavioral tests showed the mean escape latencies and search time of test group were obviously increased than those of control group and intervention group,the percentage of search distance on test groups was less than that of control group and intervention group(P ＜ 0.01 ).Immunohistochemistry results showed P38,Ca2+- CaMK Ⅱ α and CREB positive cells and optical density in hippocampus CA1 on test group were less than those of control group and intervention group ( all P ＜ 0.01 ) ( P38:58.92 ± 10.82,0.208 ± 0.037 ; Ca2+-CaMK Ⅱ α:72.38 ± 14.67,0.174 ± 0.036 ; CREB:53.86 ±5.31,0.161 ±0.043 in test group;P38:87.32 ±9.56,0.371 ±0.046 ; Ca2+ -CaMK Ⅱ α:98.16 ± 16.29,0.283 ± 0.051 ; CREB:86.76 ± 7.73,0.356 ± 0.052 in intervention group; P38:102.54 ± 16.73,0.563 ± 0.078 ; Ca2 + -CaMK Ⅱ α:123.46 ± 17.65,0.436 ± 0.057 ; CREB:125.43 ±9.16,0.524 ± 0.057 in control group ).Conclusion Gastrodia elata can treat AD by increasing expression of P38,Ca2 + -CaMK Ⅱ α and CREB.%目的 探讨天麻对阿尔茨海默病大鼠学习记忆和海马突触传递蛋白( P38、Ca2+ -CaMKⅡα、CREB)的影响.方法 将24只成年Wistar大鼠分为对照组、干预组和实验组,干预组和实验组大鼠双侧海马注射凝聚态的Aβ1-40,对照组注射等量生理盐水；模型成功后,对照组和实验组给予羧甲基纤维素钠(50g/kg)灌胃,干预组给予天麻粉剂(50g/kg)灌胃,持续15d,Morris水迷宫试验检测大鼠的学习记忆能力,应用免疫组化法检测大鼠海马神经元P38、Ca2+ -CaMK Ⅱα、CREB的表达.结果 行为学试验显示:实验组平均潜伏期、搜索时间较对照组和干预组明显延长,搜索距离百分比明显降低(P＜0.01).免疫组化结果:实验组海马CA1区P38、Ca2+ -CaMKⅡα、CREB阳性细胞数和光密度明显低于对照组和干预组(实验组P38阳性细胞数和光密度值为58.92±10.82,0.208±0.037；Ca2+ -CaMK Ⅱα为72.38±14.67,0.174±0.036; CREB为53.86±5.31,0.161 ±0.043.干预组P38阳性细胞数和光密度值为87.32±9.56,0.371±0.046；Ca2+ -CaMKⅡα为98.16±16.29,0.283 ±0.051；CREB为86.76±7.73,0.356±0.052.对照组P38阳性细胞数和光密度值为102.54±16.73,0.563±0.078；Ca2+ -CaMK Ⅱα为123.46±17.65,0.436±0.057；CREB为125.43 ±9.16,0.524 ±0.057).结论 天麻对阿尔茨海默病具有治疗作用,主要通过促进P38、Ca2+ -CaMK Ⅱα、CREB的表达发挥作用.