参乌胶囊对APP转基因小鼠学习记忆能力及脑β淀粉样肽含量的影响

Effects of Shen-wu Capsule on learning and memory ability and brain β-amyloid content in APP transgenic mice

目的观察中药参乌胶囊对APP转基因小鼠学习记忆能力的影响及其作用机制。方法将APP 695V717I转基因小鼠随机分为模型组、参乌小剂量(0 .4 g/kg·d)组和大剂量(1. 2 g/kg·d)组,同月龄同背景C57BL/6J小鼠为对照组。各组老鼠从4月龄至10月龄灌胃给药或水,然后应用Morris水迷宫和物体识别实验检测小鼠的学习记忆能力;用放射免疫法检测小鼠脑皮层匀浆中β淀粉样肽(Aβ)的含量;用刚果红染色检测皮层淀粉样斑块的数目。结果模型小鼠在Morris水迷宫实验中的游泳时间和游泳距离较对照组明显延长(P<0 01),对新物体的探索相对时间缩短,皮层可溶性Aβ含量升高(P<0 .05),脑内淀粉样斑块明显增多(P<0. 01)。与模型组比较,参乌胶囊大剂量组游泳时间缩短(P<0 .05),对新物体的探索相对时间延长(P<0 .05);大、小剂量组小鼠脑内可溶性Aβ含量和脑内淀粉样斑块均明显减少(P<0 .01)。结论参乌胶囊可明显改善APP转基因小鼠学习记忆能力,其作用机制是通过抑制脑内Aβ的产生而实现的。

ObjectiveTo investigate the effects of Shen-wu capsule on learning and memory ability and its mechanism in APP transgenic mice. MethodsThe APP 695V717I transgenic mice were randomly divided into model group, Shen-wu low dose group (0.4 g/kg·d) and high dose group (1.2 g/kg·d). Normal control adopted the same age and background C57BL/6J mice. The animals were administered intragastrically by the drug or water from 4 month old to 10 month old. Morris water maze and object recognition test were performed to measure the learning and memory ability. The content of β-amyloid (Aβ) in the brain cortex homogenate was detected with RIA,and amyloid plaques were measured with Congo red staining. ResultsIn the Morris water maze test, swimming time and swimming distance of model group were prolonged distinctly(P<0.01). Shen-wu high dose group obviously shortened swimming time(P<0.05). In the object recognition test, the relative time to the new objection in model group was obviously shorter than that in the control group(P<0.05). The relative time to the new objection for Shen-wu high dose group was obviously longer than the model group(P<0.05). The content of soluble Aβ in model group was higher than that of the control group(P<0.05). Shen-wu group decreased the soluble Aβ distinctly(P<0.01). The amyloid plaques were increased in the brain of model mice(P<0.01). Each group of Shen-wu decreased amyloid plaques significantly(P<0.01).ConclusionShen-wu Capsule ameliorated the learning and memory function disorder and decreased Aβ formation in the brain of APP transgenic model mice.