解剖学报

解剖学报 ›› 2019, Vol. 50 ›› Issue (1): 18-23.doi: 10.16098/j.issn.0529-1356.2019.01.004

• 神经生物学 • 上一篇    下一篇

氟西汀通过上调海马内溴结构域蛋白4的表达改善慢性束缚应激所致小鼠的抑郁样行为

王贞1 黄怡佳1 乃爱桃2 牛磊1  罗诗诗1  万炜1  刘政海1 陈熙1 徐杨3* 曹文宇1*   

  1. 南华大学医学院应用解剖学与生殖医学研究所，湖南 衡阳 421001; 2. 附属第一医院肿瘤放疗科，湖南 衡阳 421001; 3. 医学院生理学教研室和神经科学研究所，湖南 衡阳 421001
  • 收稿日期:2018-04-18 修回日期:2018-06-15 出版日期:2019-02-06 发布日期:2019-04-18
  • 通讯作者: 徐杨;曹文宇 E-mail:marksman0@163.com
  • 基金资助:
    湖南省自然科学基金青年基金项目;湖南省自然科学基金青年基金项目;湖南省教育厅重点项目;湖南省教育厅重点项目;湖南省卫生计生委科研课题计划项目;南华大学博士科研启动基金;南华大学博士科研启动基金;南华大学大学生研究性学习和创新性实验计划项目;南华大学大学生研究性学习和创新性实验计划项目;南华大学大学生研究性学习和创新性实验计划项目

Fluoxetine improving the depression-like behavior induced by chronic restraint stress by up-regulation the expression of bromodomain-containing protein 4 in hippocampus of mouse

WANG Zhen1 HUANG Yi-jia1 NAI Ai-tao2 NIU Lei1 LUO Shi-shi1 WAN Wei1 LIU Zheng-hai1 CHEN Xi1 XU Yang 3* CAO Wen-yu 1*   

  1. 1.Clinical Anatomy & Reproductive Medicine Application Institute, School of Medicine, University of South China, Hu’nan Hengyang 421001, China; 2.Department of Radiation Oncology, the First Affiliated Hospital of University of South China, Hu’nan Hengyang 421001, China;  3.Department of Physiology & Institute of Neuroscience Medical School, University of South China, Hu’nan Hengyang 421001, China
  • Received:2018-04-18 Revised:2018-06-15 Online:2019-02-06 Published:2019-04-18
  • Contact: XU Yang;CAO Wen-yu E-mail:marksman0@163.com

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摘要：

 目的 探讨氟西汀（FLX）对慢性束缚应激（CRS）所致小鼠抑郁样行为及海马内溴结构域蛋白4（BRD4）表达的影响。 方法 24只雄性昆明小鼠随机分为生理盐水对照（NS）组、抑郁模型（CRS）组、氟西汀干预（CRS+FLX）组。慢性束缚应激3周建立小鼠抑郁模型，应激的第8天至第21天 CRS+FLX组于应激前30 min腹腔注射氟西汀（10mg/kg），NS组及CRS组注射等体积生理盐水。采用糖水偏好实验、喷糖实验、强迫游泳实验、新旧事物识别实验和旷场实验检测各组小鼠行为变化；采用Western blotting及Real-time PCR法检测小鼠海马BRD4蛋白和mRNA的表达情况。 结果 与NS组相比，CRS组小鼠表现出明显的抑郁样行为，包括糖水偏好百分比显著降低（P<0.01），喷糖实验舔糖时间缩短（P<0.05），强迫游泳不动时间增加（P<0.01），新事物辨别指数降低（P<0.0001），抗抑郁药FLX干预可逆转CRS所诱导的上述抑郁样行为表现（P<0.05）；与NS组相比，CRS组小鼠海马BRD4蛋白及mRNA的表达明显下调（1.;0000 ± 0.04577 比 0.08337 ± 0.01658；1.0000 ± 0.04379 比 0.6672 ± 0.03193，P<0.05），而FLX可上调抑郁小鼠海马BRD4蛋白及mRNA的表达（0.08337 ± 0.01658 比 0.4983 ± 0.08574；0.6672 ± 0.03193比0.8572 ± 0.03181，P<0.05）。 结论 氟西汀可能通过上调海马BRD4的表达改善小鼠抑郁样行为。

关键词: 氟西汀, 慢性束缚应激, 抑郁症, 溴结构域蛋白4, 海马, 实时定量聚合酶链反应, 小鼠

Abstract:

Objective To investigate the effect of fluoxetine (FLX) on the expression of bromodomain-containing protein 4 (BRD4) in the hippocampus induced by chronic restraint stress (CRS), with the depression-like behaviour also being determined. Methods Twenty-four male Kunming mice were randomly divided into normal saline(NS) group, CRS group and fluoxetine(FLX) intervention(CRS+FLX) group. The mice of the CRS group were subjected to 3 weeks chronic restraint stress. The mice of CRS+FLX group were treated with fluoxetine by intraperitoneal injection 30 minutes before restraint stress from the 8 to 21 days. The mice in the NS group and CRS group were treated with NS. Depression-like behavior was determined by sucrose preference test, sucrose splash test, forced swimming test, novelty object recognition test and open field test. Expression of BRD4 in the hippocampus was determined by Western blotting and Real-time PCR. Results Compared with NS group, mice in the CRS group showed reduced sucrose preference (P<0.01) and decrease the time spent licking in Sucrose splash test (P<0.05) , increase immobility time in the forced swimming test (P<0.01) and decrease on the discrimination ratio in the novelty object recognition test, while FLX treatment effectively reversed the depression-like behavior induced by CRS (P<0.05) Compared with the NS group, CRS led to significantly decreased expression of BRD4 protein and mRNA in the hippocampus (1.000 ± 0.04577 vs 0.08337 ± 0.01658; 1.000 ± 0.04379 vs 0.6672 ± 0.03193, P<0.05), which was attenuated by FLX treatment (0.08337 ± 0.01658 vs 0.4983 ± 0.08574; 0.6672 ± 0.03193 vs 0.8572 ± 0.03181, P<0.05). Conclusion Our finding indicates that FLX could alleviate CRS-induced depression-like behavior in mice, which might be attributed to the increased expression of BRD4 in the hippocampus.

Key words: Fluoxetine, Chronic restraint stress, Depression, Bromodomain-containing protein 4, Hippocampus, Real-time PCR, Mouse