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Effect of lidocaine on the impairment of learning and memory function and central cholinergic system after transient global cerebral ischemia in mice
Author(s): 
Pages: 164-169
Year: Issue:  2
Journal: JOURNAL OF PEKING UNIVERSITY(HEALTH SCIENCES)

Keyword:  小鼠基因敲除脑缺血发作短暂性利多卡因迷宫学习乙酰胆碱;
Abstract: 目的:观察利多卡因对不同ApoE基因型小鼠短暂全脑缺血后学习记忆障碍和中枢胆碱能系统损害的影响.方法:健康雄性C57BL/6J野生型小鼠(C57小鼠)和ApoE基因敲除型小鼠(ApoE小鼠)各随机分为3组:C57对照组(假手术操作,不夹闭双侧颈总动脉)C57缺血组(夹闭双侧颈总动脉17 min,经腹腔给予生理盐水)C57利多卡因组(夹闭双侧颈总动脉17 min,经腹腔给予利多卡因)ApoE对照组(处理同C57对照组)ApoE缺血组(处理同C57缺血组)ApoE利多卡因组(处理同C57利多卡因组).术后恢复7 d,从第8天起进行Morris水迷宫测试,连续5 d.术后第12天水迷宫测试后断头处死大鼠,分离双侧大脑皮层和海马测定乙酰胆碱酯酶、胆碱乙酰基转移酶活性和M受体结合活性.结果:(1)潜伏期:各缺血组均明显长于同品系相应的对照组,C57利多卡因组还明显长于C57缺血组[测试第3天(74.1±32.7)s比(49.2±19.5)s],但ApoE利多卡因组明显短于ApoE缺血组[测试第3~5天分别为(40.7±27.7)s比(84.7±26.8)s,(31.2±19.2)s比(72.1±33.0)s,和(28.0±22.1)s比(60.8±26.9)s](P<0.05或0.01).两品系间比较,ApoE缺血组明显长于C57缺血组,但ApoE利多卡因组明显短于C57利多卡因组(P<0.05或0.01).(2)有效搜索策略百分比:各缺血组均明显低于同品系相应的对照组,C57利多卡因组还明显低于C57缺血组[测试第3~5天分别为(18.2±11.7)%比(41.7±17.7)%,(22.7±20.8)%比(55.6±20.8)%,和(29.6±27.0)%比(66.7±21.7)%],但ApoE利多卡因组明显高于ApoE缺血组[测试第3~5天分别为(41.7±25.8)%比(15.6±12.9)%,(58.3±20.4)%比(18.8±11.6)%,和(66.7±30.3)%比(28.1±20.9)%](P<0.01).两品系间比较,ApoE缺血组明显低于C57缺血组,但ApoE利多卡因组明显高于C57利多卡因组(P<0.01).(3)胆碱能系统指标:各缺血组明显低于同品系相应的对照组,C57利多卡因组还明显低于C57缺血组,但ApoE利多卡因组明显高于ApoE缺血组(P<0.05或0.01).两品系间比较,ApoE利多卡因组明显高于C57利多卡因组(P<0.05或0.01).结论:短暂全脑缺血导致小鼠明显的脑损害,表现为学习记忆功能障碍和中枢胆碱能系统功能损害;ApoE小鼠学习记忆功能障碍的程度较C57小鼠更重.利多卡因加重了短暂全脑缺血所导致的C57小鼠脑损害,但可减轻ApoE小鼠的脑损害程度.
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