5-羟甲基糠醛对脑缺血再灌注模型小鼠学习记忆及脑部自由基的影响

目的:探讨5-羟甲基糠醛(5-HMF)对脑缺血再灌注模型小鼠学习记忆及脑部自由基的影响。方法:小鼠分为假手术组、模型组、5-HMF低高剂量组和甲磺酸二氢麦角碱阳性对照组,各组给予相应药物后除假手术组外均建立脑缺血再灌注小鼠模型,以Morris水迷宫和跳台实验观测小鼠学习记忆能力,并检测其脑组织超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量。结果:与假手术组比较,模型组Morris水迷宫实验中逃避潜伏期和游泳路径均明显延长,跳台实验的潜伏期缩短、错误次数增加;脑部SOD活性降低、MDA含量升高(P<0·01或P<0·05),与模型组比较,5-HMF组上述各指标均明显改善(P<0·01或0·05)。结论:5-HMF口服给药可改善脑缺血再灌注引起的学习记忆障碍,其机制可能与恢复脑组织清除自由基的酶活力抗自由基损伤有关。

Effects of 5-hydroxymethylfurfural on Learning-memory and Brain Free Radical Metabolism in Cerebral Ischemia-Reperfusion Model Mice

OBJECTIVE:To study the effects of 5-hydroxymethylfurfural on learning-memory and cerebral free radical metabolism in cerebral ischemia and reperfusion model mice. METHODS: The mice were divided into sham operation group, model group, 5-HMF low dose group, 5-HMF high dose group, and dihydroergotamine mesilate positive control group. After administration of the corresponding drugs, all groups except the sham operation group were subjected to construction of cerebral ischemia and reperfusion model. The learning-memory of mice was examined by Morris water maze and step-down tests, and cerebral superoxide dismutase (SOD) activity and malondialdehyde (MDA) content were determined as well. RESULTS: In model group compared with sham operation group the escape latency and swimming distance were significantly prolonged in Morris water maze test (P<0.05); the latency was significantly decreased in step-down test (P<0.01); the number of errors was increased (P<0.05); SOD activity was significantly decreased in the brain tissue (P<0.01), and MDA content was increased (P<0.01). In 5-HMF group compared with model group all the above-mentioned parameters improved significantly (P<0.01 or 0.05). CONCLUSION: Oral administration of 5-hydroxymethylfurfural can help improve dysmnesia induced by cerebral ischemia and reperfusion, and the mechanism may be related to its ability to help the recovery of cerebral free radical-eliminating enzyme activity and to resist free radical damage.