›› 2010, Vol. 30 ›› Issue (6): 674-.

• 论著(基础研究) • 上一篇    下一篇

头端延髓腹内侧部微量注射雌激素对大鼠内脏运动反应的影响

聂培鹤, 董 莉, 支建明, 戎伟芳   

  1. 上海交通大学 基础医学院生理学教研室, 上海 200025
  • 出版日期:2010-06-25 发布日期:2010-06-28
  • 通讯作者: 戎伟芳, 电子信箱: weifangrong@hotmail.com。
  • 作者简介:聂培鹤(1982—), 男, 硕士生;电子信箱: niepeihe@163.com。
  • 基金资助:

    教育部留学回国人员启动基金和上海市卫生局青年科研基金(2007Y44)

Effects of microinjection of estrogen into rostral ventromedial medulla on visceromotor responses in rats

NIE Pei-he, |DONG Li, |ZHI Jian-ming, |RONG Wei-fang   

  1. Department of Physiology, Basic Medical College, Shanghai Jiaotong University, Shanghai 200025, China
  • Online:2010-06-25 Published:2010-06-28
  • Supported by:

    The Ministry of Education Foundation;Shanghai Municipal Health Bureau Foundation, 2007Y44

摘要:

目的 探讨雌激素在延髓头端腹内侧部(RVM)对内脏痛的潜在调节作用。方法 采用成年雌性大鼠,在浅麻醉状态下记录充胀直肠(CRD)引起的腹肌放电活动,即内脏运动反应(VMR);RVM局部和小脑延髓池给予雌激素和(或)吗啡,观察VMR变化。结果 RVM部位微量注射雌激素(0.01~1 μmol/L, 0.5 μL)可剂量依赖性地增强CRD引起的VMR,这一作用的潜伏期<2 min;小脑延髓池给予雌激素(0.1~1 μmol/L, 50 μL)可以拮抗RVM部位给予吗啡对VMR的抑制效应,该拮抗效应随雌激素浓度的升高而增强。结论 雌激素作用于RVM部位,不仅使VMR增强,还可以拮抗吗啡的中枢镇痛作用。

关键词: 雌激素, 延髓头端腹内侧部, 内脏运动反应, 内脏痛

Abstract:

Objective To examine the potential roles of estrogen in rostral ventromedial medulla (RVM) on visceral nociception. Methods The visceromotor responses (VMR) evoked by repeated colorectal distention (CRD) were monitored in lightly anesthetized adult female rats. Various doses of estrogen or morphine were applied by microinjection into RVM or cerebellomedullary cistern, and the changes of VMR were observed. Results Local administration of estrogen in RVM (0.01-1 μmol/L, 0.5 μL) resulted in dose-dependent increments in VMR evoked by CRD, with <2 min for the latency of this effect. Moreover, estrogen (0.1-1 μmol/L, 50 μL)applied intracisternally dose-dependently blocked the analgesia induced by microinjection of morphine into RVM. Conclusion Estrogen acting in RVM may not only enhance VMR, but also antagonize the analgesic action of morphine.

Key words: estrogen, rostral ventromedial medulla, visceromotor response, visceral pain