食品科学

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DHA提高大鼠学习记忆的分子机制研究

马 琳,王丽梅,樊永波,吴 晨,陶兴无,刘志国,刘烈炬*   

  1. 武汉轻工大学生物与制药工程学院,湖北 武汉 430023
  • 出版日期:2013-09-15 发布日期:2013-09-27
  • 通讯作者: 刘烈炬
  • 基金资助:

    国家自然科学基金青年科学基金项目(31000772);武汉工业学院校级教学研究项目(XM2010014)

Molecular Mechanism of DHA for Improving Learning and Memory in Rats

MA Lin,WANG Li-mei,FAN Yong-bo,WU Chen,TAO Xing-wu,LIU Zhi-guo,LIU Lie-ju*   

  1. School of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China
  • Online:2013-09-15 Published:2013-09-27
  • Contact: LIU Lie-ju

摘要:

目的:研究二十二碳六烯酸(DHA)对大鼠学习记忆的影响并探讨其作用的分子机制。方法:将32只初断乳SD雄性大鼠,按随机数字表法分成4组:阴性对照组、阳性对照组、DHA低剂量组(370mg/(kg·d))和DHA高剂量组(740mg/(kg·d))。连续饲养8周,测定大鼠脑组织中乙酰胆碱酯酶(AChE)、一氧化氮合酶(NOS)的活性,其次,采用RT-PCR方法测定大鼠脑部海马组织中N-甲基-D-天冬氨酸(NMDA)受体亚基(NR1)、cAMP反应元件结合蛋白(CERB)、即刻早期基因(c-fos)mRNA的表达水平。结果:与阴性对照组相比,DHA高、低剂量均能提高大鼠脑组织AChE和NOS的活性,并且能够显著上调海马组织内NR1、CREB、c-fos基因mRNA的表达(P<0.01),但以低剂量为佳。结论:DHA能够提高大鼠学习记忆能力并且存在一定的量效关系,其机制与上调海马组织内NR1、CREB、c-fos基因 mRNA的表达水平有关。

关键词: DHA, 学习记忆, N-甲基-D-天冬氨酸受体亚基, cAMP反应元件结合蛋白, 即刻早期基因

Abstract:

This study was aimed to investigate the effect of docosahexaenoic acid on learning and memory abilities in rats
and to explore the relevant molecular mechanism. A total of 32 neonatal male SD rats were randomly divided into 4 groups:
negative control group, positive control group, low (370 mg/(kg·d)) and high dose DHA group (740 mg/(kg·d)). After
8 weeks of feeding, the enzyme activities of acetylcholinesterase (AChE) and nitric oxide synthase (NOS) in brain tissue
of rats were analyzed. The mRNA expressions of N-methyl-D-aspartate receptor subunit (NR1), cAMP responsive element
binding protein (CERB), immediate early gene (c-fos) in the hippocampus of rats were determined by RT-PCR. Results
showed that compared to the negative control group, DHA at both doses was able to significantly increase AChE and NOS
activities in brain tissue as well as the mRNA expression levels of NR1, CREB and c-fos while the low dose presented
higher effect. In summary, DHA could remarkably improve learning and memory abilities in rats in a dose-dependent
manner. The mechanism might be involved with the upregulation of NR1, CREB and c-fos mRNA expression by DHA in the
hippocampus of rats.

Key words: DHA, learning and memory, N-methyl-D-aspartate receptor, cAMP responsive element binding protein, c-fos

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