慢性皮质酮注射诱导焦虑性抑郁树鼩模型的研究

摘要

Aim To investigate the effects of chronic corticos-terone injection on anxiety and depression-like behavior of tree shrews, evaluate the predictability of drug and establish a novel animal model of anxious depression .Methods Twelve Chinese and Burma tree shrews were randomly divided into normal group, model group and venlafaxine group .The anxious depres-sion model of tree shrew was established by chronic corticoster-one injection ( ih, 27 mg· kg-1 , 21 d) .The venlafaxine group received intragastric administration (6 mg· kg-1).Autonomous activity score, sugar water preference test and Morris water maze test were used to evaluate the anxiety and depression-like behav-ior of tree shrews .The expressions of CRH , ACTH and COR in the tree shrew plasma were determined by Elisa kit .The con-tents of monoamine neurotransmitters of tree shrews in the hippo-campus , amygdala and prefrontal cortex were detected by HPLC-ECD.Results Compared with the normal group , the autono-mous activity score , sugar water partial eclipse degree and the learning and memory ability significantly decreased (P<0.01), while the contents of CRH , ACTH and COR significantly in-creased ( P<0.05) , and the contents of 5-HT, NE and DA in the hippocampus , amygdala and prefrontal cortex declined in the model group(P<0.05).In the venlafaxine group, the learning and memory abilities of the tree shrews were improved , the lev-els of CRH and COR in plasma were significantly decreased ( P<0.05), and the contents of 5-HT, NE and DA were increased (P<0.05).Conclusions The tree shrews of anxious depres-sion have obvious HPA axis hyperactivity and monoamine neuro-transmitter disorder , and venlafaxine can reverse this phenome-non, indicating that the tree shrews model of anxious depression has drug predictability , which is a kind of novel animal model of anxious depression closer to human in clinic .%目的 探讨慢性皮质酮注射对近灵长类动物树鼩焦虑和抑郁样行为的影响,并进行药物预见性评价,建立新型焦虑性抑郁动物模型.方法 12只中缅树鼩随机分为正常组、模型组和文拉法辛组,每组4只.采用慢性皮质酮注射(ih,27 mg·kg-1,21 d)建立焦虑性抑郁树鼩模型,文拉法辛组于造模同时灌胃给药(6 mg·kg-1).采用自主活动评分、糖水偏好测试、Morris水迷宫实验评价树鼩的焦虑和抑郁行为表现;ELISA试剂盒检测树鼩血浆CRH、ACTH、COR含量;HPLC-ECD法检测树鼩脑内海马、杏仁核、前额叶皮质的单胺递质5-HT、NE、DA含量.结果 与正常组比较,模型组树鼩自主活动评分、糖水偏食度、学习记忆能力均明显下降(P<0.01),血浆CRH、ACTH、COR含量明显上升(P<0.05),海马、杏仁核、前额叶皮质5-HT、NE、DA含量降低(P<0.05);文拉法辛组树鼩学习记忆能力得到改善,血浆CRH、COR含量明显降低(P<0.05),各脑区5-HT、NE、DA含量上升(P<0.05).结论 焦虑性抑郁模型树鼩具有明显的HPA轴亢进及单胺递质失调现象,而文拉法辛能够逆转该现象,说明该焦虑性抑郁树鼩模型具有药物预见性,是一种更接近人类临床的新型焦虑性抑郁动物模型.