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中国应用生理学杂志 ›› 2016, Vol. 32 ›› Issue (5): 403-407.doi: 10.13459/j.cnki.cjap.2016.05.005

• 研究论文 • 上一篇    下一篇

慢性神经痛对抑郁状态以及中枢多巴胺神经元电生理的影响

付波1,2, 翁谢川1,2, 王静3, 黄涛1,2, 王滨1,2, 林世德1,2, 刘少君1,2   

  1. 1. 军事医学科学院基础医学研究所神经生物学研究室, 北京 100850;
    2. 军事医学科学院国家蛋白质组学重点实验室, 北京 100850;
    3. 军事医学科学院卫生环境学研究所, 天津 300050
  • 收稿日期:2016-03-07 修回日期:2016-05-25 出版日期:2016-09-28 发布日期:2018-06-20
  • 通讯作者: 翁谢川,Tel:010-66931345;E-mail:wengxc2000@sina.com;刘少君,Tel:010-66931304;E-mail:liusj@bmi.ac.cn E-mail:wengxc2000@sina.com;liusj@bmi.ac.cn
  • 基金资助:
    北京市自然科学基金面上项目(7142123);蛋白质组学国家重点实验室优青课题(SKLP-YB201403);总装预研基金课题(9140A26060215JB94001)

The impact of electrophysiology of central dopaminergic neurons and the depression-state induced by chronic neuropathic pain

FU Bo1,2, WENG Xie-chuan1,2, WANG Jing3, HUANG Tao1,2, WANG Bin1,2, LIN Shi-de1,2, LIU Shao-jun1,2   

  1. 1. Department of Biology, Institute of Basic Medical Science, Academyof Military Medical Sciences, Beijing 100850;
    2. State Key Laboratory of Proteomics, Beijing 100850;
    3. Institute of Health and Environmental Medicine, Academy of Military Medical Sciences, Tianjin 300050, China
  • Received:2016-03-07 Revised:2016-05-25 Online:2016-09-28 Published:2018-06-20
  • Supported by:
    北京市自然科学基金面上项目(7142123);蛋白质组学国家重点实验室优青课题(SKLP-YB201403);总装预研基金课题(9140A26060215JB94001)

摘要: 目的:探讨大鼠慢性神经痛导致抑郁症状发生后,中脑腹侧被盖区多巴胺能神经元自发放电活动的改变情况。方法:24只健康成年大鼠进行随机分组(n=12):假手术组(Sham)大鼠仅进行坐骨神经分支暴露,坐骨神经损伤组(SNI)进行坐骨神经分支选择性损伤。在神经损伤后的第3、7、14、28、42、56天进行机械刺激计算缩足反射阈值,并进行糖水偏好、强迫游泳、旷场实验等行为学实验来评价大鼠是否发生抑郁症状;利用在体多通道电生理技术,对SNI组大鼠和假手术组大鼠中脑腹侧被盖区神经元分别进行记录分析。结果:与假手术组比较,SNI组大鼠的机械痛阈值明显降低(P<0.01);在旷场实验、糖水偏好、强迫游泳较对照组出现显著性差异(P<0.01);大鼠中脑腹侧被盖区多巴胺能神经元自发放电频率、簇状放电活动中动作电位的数量明显增加(P<0.01)。结论:慢性疼痛可以导致大鼠抑郁相关症状的发生,中脑腹侧被盖区多巴胺能神经元自发放电频率增加与疼痛后抑郁发生相关。

关键词: 抑郁, 多巴胺能神经元, 慢性神经痛, 自发放电, 大鼠

Abstract: Objective: To explore the underlying electrophysiological mechanism of depression induced by chronic pain in dopaminergic neurons in midbrain ventral tegmental area (VTA) of rats. Methods: Twenty-four healthy adult rats were divided into two groups randomly(n=12):12 rats formed the sham group by exposing the spared nerve, and another 12 rats were served as the spared nerve injury (SNI)group by branchedness sciatic nerve injury surgery. The mechanical allodynia test were detected on the day of 3, 7, 14, 28, 42 and 56 after surgery, and the depressive-like behaviors such as open-field test, sucrose preference and forcedswim test were detected at the same time. Then we used the Multichannel Acquisition Processor (MAP) system to record the firing activity of neurons in VTA in both Sham rats and SNI rats.Results: ①Comparing to sham rats, the paw withdrawalmechanical threshold of SNI rats was decreased significantly (P< 0.01);② According to depression-related behavioral test, SNI rats showed significant difference in open field text, sucrose preference, focus swim text comparing with Sham rats (P< 0.01);③ The firing rate and burst activity of dopaminergic neuronsin midbrain VTA are increased in depression rats compare to sham rats(P<0.05).Conclusion: Chronic pain could induce depression, and the increase of spontaneous firing rate of dopaminergic neurons in midbrain VTA might be contribute to the depression induced by the chronic neuropathic pain.

Key words: depression, dopaminergic neurons, chronic neuropathic pain, spontaneous firing, rat

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