大鼠学习记忆能力和特定脑区的抗氧化酶活性

背景学习记忆是一个十分复杂的生物现象,参与学习记忆的物质以及与学习记忆有关的脑区虽然研究较多,但是,其机制仍没有完全阐明.目的探讨不同学习记忆能力大鼠的不同脑区抗氧化酶活性的差异,以揭示学习记忆能力与特定脑区抗氧化酶活性的关系.设计以实验动物为对象,完全随机设计实验.单位济宁医学院生物化学教研室.材料实验于2001-03/2004-01在济宁医学院生化教研室及苏州医学院完成.wistar大鼠40只,15月龄,雄性,体质量580～650 g.干预学习记忆能力的检测在MG-2型三等分辐射式迷宫中进行.大鼠受电击后直接逃至安全区为正确反应,连续10次有9次正确即达到了学会的标准,观察指标有达标所需反应次数及正确反应率.达标所需反应次数低于(或等于)40次者为学习能力好.否则为学习能力差.24 h后重复检验,观察其记忆保持情况.连续3次均能正确反应者为记忆能力好,否则为记忆能力差.学习能力、记忆能力均好组(10只);学习能力、记忆能力均差组(12只).其余被淘汰掉.主要观察指标两组大鼠大脑皮质、小脑、纹状体、海马、下丘脑5个脑区超氧化物歧化酶、过氧化氢酶、谷胱甘肽过氧化物酶活性.结果学习记忆能力均差的大鼠与学习记忆能力均好的大鼠比较皮质、海马、纹状体超氧化物歧化酶活性显著降低(t=3.82,4.50,6.76,P＜0.01);过氧化氢酶活性在皮质、海马、纹状体、下丘脑4个脑区均显著降低(t=4.75,7.06,10.88,17.28,P＜0.001);各脑区谷胱甘肽过氧化物酶活性两组间无统计学差异.结论海马、皮质、纹状体、下丘脑可能均参与学习记忆过程,这些脑区的抗氧化酶活性与学习记忆密切相关.

Relationship between the ability of learning and memory and activity of antioxidase in specific brain area of rats

BACKGROUND: Learning and memory is a very complex biological phenomenon. Although quite a few researches on the substances participate in learning and memory and the brain areas related with learning and memory,its mechanism is still not completely clarified.OBJECTIVE:ro study the difference of antioxidase activity at different brain area in rats with different ability of learning and memory to reveal the relationship between the ability of learning and memory and the activity of antioxidase in specific brain area.DESIGN: A randomized controlled trial based on the experimental animals.SETTING: Department of Biochemistry in Jining Medical College.MATERIALS: The study was conducted in the Laboratory of Biochemistry of Jining Medical College and Suzbeu Medical College between March 2001 and January 2004. Forty 15-month old male Wistar rats with a body mass between 580 g and 650 g were selected.INTERVENTIONS: The detection of learning memory ability was carried out in MG-2 trisection radiation maze. Correction response was that the rats escaped to safe area after electric shock. Standard of master was that the rats had 9 out of 10 times continuously of correction. Observatory indicators included times of response required reaching the standard and the correct response rate. Good learning. ability meant 40 or less than 40 times of responses to reach standard; otherwise, poor learning ability was considered. Detection was repeated after 24 hours to observe the memory. Good memory meant 3 times continuously of correct response; otherwise, poor memory was considered. Rats with good learning ability and memory were included into group 1 (n= 10) and the rats with poor learning ability and memory were included into group 2( n = 12). The rest rats were washed out.MAIN OUTCOME MEASURES: Activities of superoxide dismutase (SOD), catalase(CAT) and glutathione-peroxidase(GSH-Px) of five brain areas including cerebral cortex, cerebella, striatum, hippocampus and hypothalamus in rats of two groups.RESULTS: To compare the rats with poor learning and memory ability with rats with good learning and memory ability: SOD activity in cortex, hippocampus and striatum significantly reduced ( t = 3.82, 4. 50, 6. 76, P ＜0.01); CAT activity in cortex, hippocampus, striatum and hypothalamus significantly reduced(t =4.75, 7.06, 10. 88, 17.28, P＜0.001); and GSH-Px activity was similar in each brain area without statistical significance.CONCLUSION: Hippocampus, cortex, striatum and hypothalamus all might participate in learning memory process, and the activities of antioxidases in these areas are closely related with learning memory.