吉林大学学报(医学版)

• 基础研究 • 上一篇    下一篇

中缝大核对大鼠心脏伤害性感受的下行抑制性调控作用及其调控通路

孙娜1,牛利刚2,孔令恒1,朱娟霞1,徐燕1,杜剑青2   

  1. (1.西安医学院基础医学研究所生理学教研室,陕西 西安 710021;2.西安交通大学医学院生理学与病理生理学系,陕西 西安 710061)
  • 收稿日期:2013-10-11 出版日期:2014-05-28 发布日期:2014-05-28
  • 通讯作者: 杜剑青 E-mail:(Tel:029-82657490-802,E-mail:dujianq@mail.xjtu.edu.cn)
  • 作者简介:孙 娜(1980-),女,陕西省西安市人,讲师,理学博士,主要从事心脏痛觉的研究。
  • 基金资助:

    国家自然科学基金资助课题(31171068);陕西省教育厅专项科研计划项目资助课题(2013JK0769,2013JK0770);西安医学院博士基金资助课题(2012DOC06)

Descending inhibitory modulation  of nucleus  raphes magnus in cardiac nociception in rats and its pathway

SUN Na1,NIU Li-gang2,KONG Ling-heng1,ZHU Juan-xia1,XU Yan1,DU Jian-qing2   

  1. (1.Department of  Physiology,Institute of Basic Medical Sciences,Xi’an Medical University,Xi’an 710021, China; 2. Department o f Physiology and Pathophysiology,School of Medical Sciences,Xi’an Jiaotong University,Xi’an 710061,China)
  • Received:2013-10-11 Online:2014-05-28 Published:2014-05-28

摘要:

目的:观察大鼠心脏-躯体运动反射(CMR),阐明中缝大核(NRM)对大鼠心脏伤害性感受的下行抑制性调控作用及其调控通路。方法:34只雄性健康SD大鼠随机分为NRM电刺激组(n=8)、NRM电刺激联合脊髓背外侧束(DLF)横断组(n=8)和NRM电刺激联合5-羟色胺(5-HT)受体拮抗剂鞘内微注射组(n=18)。所有大鼠均采用心包插管术制作为CMR模型,以心包内注入致痛剂辣椒素(CAP)所诱发的背斜方肌肌电(EMG)为检测指标,通过NRM区域放置刺激电极和(或)脊髓鞘内置管的方法,观察NRM高强度电刺激对CMR的下行调控作用及双侧DLF横断和鞘内5-HT受体拮抗剂注射对NRM下行调控作用的影响。 结果:给予NRM 75 μA 高强度电刺激后,CAP注射诱发的EMG反应与其未实施NRM电刺激前的基础对照比较明显减小(P<0.05);实施双侧DLF横断后,NRM高强度电刺激后的EMG反应明显大于DLF横断前(P<0.05),且与其基础对照比较差异无统计学意义(P>0.05);5-HT受体拮抗剂鞘内微注射后,NRM高强度电刺激后的EMG反应较鞘内注射前明显增加(P<0.05),但仍小于其基础对照(P<0.05)。 结论: NRM高强度电刺激对心脏伤害性感受具有下行抑制性调控作用,其下行抑制性调控通路主要由DLF所介导,且脊髓内5-HT能神经系统可能参与了源自NRM的抑制性调控过程。

关键词: 中缝大核, 心脏伤害性感受, 脊髓背外侧束, 电刺激, 肌电, 5-羟色胺

Abstract:

Abstract:Objective To observe the cardiosomatic motor reflex (CMR) of rats,and to clarify the descending modulation of  nucleus  raphes magnus (NRM) in  cardiac nociception and its pathway.Methods 34 male healthy SD rats were randomly divided into NRM electrical stimulation group (n=8),NRM stimulation combined with  dorsolateral funiculus (DLF) transection group (n=8),NRM stimulation combined with antagonist of 5-hydroxytryptamine (5-HT) methysergide intrathecal administration group (n=18).The rat model of CMR was established through injecting capsaicin into the pericardial sac of the rats in various groups.The electromyogram (EMG) response of dorsal spinotrapezius muscle was used as detection index,and by placing the stimulation electrode in NRM and (or) intrathecal catheterization,the   descending inhibitory modulation of NRM in CMR and the influence of  DLF tansection or methysergide in
trathecal administration in descending inhibitory modulation of NRM were observed.Results Compared with  before stimulation,the EMG response was decreased after NRM electrical stimulation (75 μA) (P<0.05); after bilateral DLF transection,the EMG response after NRM stimulation was significantly increased compared with before DLF transection(P<0.05),and there was no significant difference compared with its control (P>0.05).In addition,after intrathecal administration of methysergide,the EMG response after NRM stimulation was significantly increased compared with before intrathecal treatment of methysergide (P<0.05),but it was still significantly smaller than that of its  control (P<0.05).Conclusion Cardiac nociception evoked by capsaicin stimulation is subject to descending inhibitorymodulation from NRM,and the descending inhibition from NRM is conveyed via the DLF and partially mediated by endogenous 5-HT system.

Key words: nucleus raphes magnus, cardiac nociception, dorsolateral funiculus, electrical stimulation, electromyogram, 5-hydroxytryptamine

中图分类号: 

  • R338