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山东大学学报(医学版) ›› 2014, Vol. 52 ›› Issue (3): 33-36.doi: 10.6040/j.issn.1671-7554.0.2013.003

• 基础医学 • 上一篇    下一篇

脑组织海马区脑源性神经营养因子在焦虑调节内脏高敏感中的作用

赵宏宇,陈飞雪,曹静,戚庆庆,李月月,左秀丽,李延青   

  1. 山东大学齐鲁医院消化内科, 山东 济南 250012
  • 收稿日期:2013-09-06 出版日期:2014-03-10 发布日期:2014-03-10
  • 通讯作者: 李延青。 E-mail:liyanqing@sdu.edu.cn
  • 基金资助:

    国家自然科学基金(81170352,81270457)

Hippocampal brain-derived neurotrophic factor regulates the impact of anxiety to visceral hypersensitivity

ZHAO Hongyu, CHEN Feixue, CAO Jing, QI Qingqing, LI Yueyue, ZUO Xiuli, LI Yanqing   

  1. Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan 250012, Shandong, China
  • Received:2013-09-06 Online:2014-03-10 Published:2014-03-10

摘要:

目的  探讨母婴分离(MS)大鼠脑组织海马区脑源性神经营养因子(BDNF)的变化及其在焦虑调节内脏高敏感中的作用。方法  建立MS大鼠模型,模拟肠易激综合征(IBS)内脏高敏感伴焦虑的特征。先后采用旷场实验和腹壁撤退反射(AWR)评估大鼠焦虑行为和内脏敏感性,并分别用酶联免疫吸附方法  和免疫组织化学方法  检测海马区BDNF的蛋白表达水平;分析MS组大鼠焦虑水平、内脏高敏感程度及海马区BDNF含量之间的相关性。结果  ①旷场实验中,MS组大鼠中央停留时间及穿越次数少于对照组(P<0.05),提示其焦虑水平增加;②MS组大鼠在直肠扩张20、40、60、80mmHg时AWR评分均高于对照组(P<0.05);③MS大鼠海马区BDNF含量明显升高(P<0.05),且海马CA1、CA3区BDNF表达阳性细胞数大于对照组(P<0.05);④MS组大鼠焦虑水平、内脏高敏感程度及海马区BDNF蛋白水平两两之间均呈正相关。结论  在MS模型模拟的IBS中,脑组织海马区BDNF增高,且参与调节焦虑对内脏高敏感的促进作用。

关键词: 母婴分离, 焦虑, 内脏高敏感, 脑源性神经营养因子

Abstract:

Objective  To investigate the expression of brain-derived neurotrophic factor (BDNF) in hippocampus of the maternally separated animals, and to explore the regulatory role of hippocampal BDNF on the impact of anxiety to visceral hypersensitivity. Methods  We used maternal separation (MS)   to study irritable bowel syndrome (IBS). The anxiety of rats was observed and measured in open-field test, and then the visceromotor responses to colorectal balloon distension (CRD) were assessed by abdominal withdrawal reflex (AWR). The expression of BDNF in hippocampus was determined by enzyme-linked immunosorbent assay (ELISA) and immunohistochemistry. The correlations among anxiety, visceral hypersensitivity and the expression of BDNF in hippocampus were analyzed in MS rats. Results  Compared with control rats, MS rats showed more anxieties (P<0.05), and had more visceral pain (P<0.05) in response to each CRD pressure gradient (20, 40, 60 and 80mmHg). The protein expression of BDNF was increased in hippocampus of MS rats compared with controls (P<0.05), especially in the CA1 and CA3 areas of hippocampus (P<0.05). The level of anxiety was positively correlated with the hypersensitivity in MS rats, and the expression of BDNF in the hippocampus was positively correlated not only with the level of anxiety but also with hypersensitivity. Conclusion  Upregulation of BDNF expression in hippocampus plays an essential role in anxiety-induced visceral hypersensitivity in IBS.

Key words: Anxiety, Maternal separation, Visceral hypersensitivity, Brain-derived neurotrophic factor

中图分类号: 

  • R574.4
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