脑缺血再灌致小鼠学习记忆障碍模型的建立

Establishment of mice model with learning and memory deficits induced by cerebral ischemia/reperfusion

目的:建立一种新的脑缺血再灌致小鼠学习记忆障碍模型。方法:采用双侧颈总动脉夹闭合并取血降压再回输的方法建立小鼠学习记忆障碍模型,进行自发活动、跳台和水迷宫实验、病理学检测及总抗氧化能力、超氧化物歧化酶(superoxidedismutase,SOD)、丙二醛(malondialdehyde,MDA)的检测。结果:与假手术组比较,模型组小鼠神经元损伤明显,小鼠自发活动明显减少,跳台实验的上台潜伏期、电击时间明显上升,记忆成绩中的错误次数明显增多,下台潜伏期、台上总停留时间显著下降。与假手术组比较,模型组小鼠空间分辨学习记忆成绩明显降低,D3、D4、D5的错误次数明显增加,潜伏期显著上升。模型组总抗氧化能力和SOD活性显著下降,MDA含量明显升高。结论:双侧颈总动脉夹闭合并取血降压再灌注方法建立的小鼠模型可作为脑缺血再灌致学习记忆障碍的动物模型用于基础实验研究。

Objective:To establish mice model with learning and memory deficit induced by cerebral ischemia/reperfusion.Methods:The mice model induced by cerebral ischemia/reperfusion were made by bilateral occlusion of both common carotid arteries and ischemic hypotension/reperfusion.Locomotive activity,step-down test and water maze were used to reflect behavior changes,as well as cell morphologic changes were evaluated,respectively.And total anti-oxidant capacity and activities of SOD(superoxide dismutase)and MDA(malondialdehyde)were also measured.Results:The neuronal damage in model mice was significant,compared with sham group.And locomotive activity of model mice markedly decreased.The escape latency and time of electric shock of model mice significantly increased in step-down test;and 24 hours later the number of errors significantly increased,step-down latency and time of remaining on platform markedly decreased.In maze test,the spatial learning and memory ability of model mice significantly decreased with characteristics of increase in the number of errors and latency at D3,D4 and D5,and the total anti-oxidant capacity and activities of SOD were decreased and MDA level increased in model group compared with sham group,respectively.Conclusion:This model of mice cerebral ischemia/reperfusion is useful for studying learning and memory deficit.