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山东大学学报(医学版) ›› 2009, Vol. 47 ›› Issue (8): 33-36.

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普萘洛尔对应激大鼠行为、血清皮质酮和海马形态学的影响

江虹1,杨乐金1,樊淑娟2,刘欣1,潘芳1   

  1. 1. 山东大学医学院医学心理学研究所, 济南 250012; 2. 香港大学脑研究中心, 中国 香港 999077
  • 收稿日期:2009-05-04 发布日期:2009-08-16
  • 通讯作者: 潘芳(1962- ),女,教授,博士生导师,主要从事应激的损伤和保护机制研究。 Email:panfang2003@hotmail.com
  • 作者简介:江虹(1965- ),女,实验师,主要从事心理测验及动物实验的研究。 Email:jiangh@sdu.edu.cn
  • 基金资助:

    山东省自然科学基金资助项目(Y2006C42)。

Effects of propranolol on behavior, serum corticosterone level andhippocampal morphology in stressed rats

JIANG Hong 1,YANG Lejin 1, FAN Shujuan 2, LIU Xin 1, PAN Fang 1   

  1. 1. Department of Medical Psychology, School of Medicine, Shandong University Jinan 250012 China;
    2. Brain Research Center, the University of HongKong, HongKong 999077, China
  • Received:2009-05-04 Published:2009-08-16

摘要:

目的观察普萘洛尔对慢性轻度不可预知性应激(CUMS)模型大鼠急性应激前后行为、血清皮质酮水平、海马DG区和CA3区形态学的影响。方法随机将健康成年Wistar雄性大鼠30只分为空白对照组、CUMS组、普萘洛尔处理组各10只。空白对照组大鼠不施加任何处理因素,其他组大鼠经过21?d CUMS暴露制作模型,普萘洛尔组大鼠于每次应激前0.5?h给予普萘洛尔混悬液灌胃。造模结束后,于第22天从3组大鼠中各随机抽取半数大鼠给予一定强度电击,应激结束后2?h取血,采用放射免疫法检测大鼠血清皮质醇的含量换算成皮质酮含量,脑区石蜡切片行HE染色。结果CUMS组大鼠呈现明显的主动活动和探索行为能力下降,海马DG区和CA3区形态学病理改变严重。与对照组比较,普萘洛尔组大鼠急性应激前皮质酮水平明显升高,急性应激后大鼠皮质酮水平显著降低,不能抑制海马DG区和CA3区病理改变,且有加重趋势。结论普萘洛尔可缓解应激导致的焦虑情绪,并降低个体遭遇急性应激时皮质酮的调动。

关键词: 应激,心理学;行为;皮质酮;海马;大鼠,Wistar

Abstract:

To explore the effect of propranolol on behavior, serum corticosterone level and hippocampal morphology in the chronic unpredictable mild model (CUMS) rats before and after the acute stress. MethodsThirty Wistar male rats were randomly divided into three groups: the control group, CUMS group and propranolol group. The control group was left undisturbed in home cages, while others were exposed to CUMS for 21 days. The propranolol group received perfusion of propranolol and the CUMS group was perfused with normal saline. Then, half of each group were randomly chosen and encountered electric foot shock on day 22. The rats were sacrificed by decapitation two hours after the acute stress. The content of serum corticosterone was evaluated by cortisol radioimmunoassays. And hematoxylineosin staining was used to study morphological changes in the hippocampus. ResultsThe results of openfield test showed that model rats had less locomotor and exploratory activities, and the changes of hippocampal morphology were severe. In contrast to the controls, serum corticosterone in the propranolol group was significantly upregulated before the acute stress, while an obvious decreased level was observed after the novel insult. Moreover, it could not inhibit the morphological changes in the hippocampus. ConclusionPropranolol could relieve anxiety symptoms in chronic stress, however, it decreased the level of serum corticosterone when animals faced acute stress stimulus.

Key words: Stress, psychological; Behavior; Corticosterone; Hippocampus; Rats, Wistar

中图分类号: 

  • R395.1
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