生长抑素及其类似物对犬奥迪括约肌运动的作用

Effects of somatostatin and its analogue on canine sphincter of Oddi motility

目的 研究生长抑素及其类似物对奥迪括约肌消化间期运动的作用。方法 建立犬奥迪括约肌测压慢性实验动物模型。将 6只犬随机分为生长抑素组、思他宁组和善宁组 ,每周进入一组实验 ,于空腹、清醒状态下 ,通过高分辨多道全胃肠功能监测仪 ,记录静脉用药前后奥迪括约肌的动力指数、基础压 ,以及时相收缩幅度、时限和频率。结果 生长抑素和思他宁在 0 .5nmol·kg-1·h-1浓度时诱发奥迪括约肌时相收缩 ,并升高动力指数 ;两药浓度为 1nmol·kg-1·h-1时抑制括约肌运动并降低动力指数。善宁在 0 .5～ 1nmol·kg-1·h-1浓度时诱发奥迪括约肌时相收缩 ,其中在 0 .5nmol·kg-1·h-1浓度时升高动力指数 ,1nmol·kg-1·h-1浓度时不影响动力指数。结论 生长抑素和思他宁对奥迪括约肌运动的调节呈双相作用 ,小剂量为兴奋作用 ,大剂量为抑制作用。善宁对奥迪括约肌运动的调节 ,小剂量为兴奋作用 ,大剂量无明显影响。

Objective To investigate the effects of somatostatin and its synthetic analogue on canine sphincter of Oddi interdigestive motility. Methods Six dogs were used to establish the chronic manometry model to study the sphincter of Oddi motility, which were then classified into three groups: somatostatin, stilamin, and sandostatin groups. Each dog was studied weekly. The sphincter of Oddi manometry in fast and conscious state was undertaken with PC Polygraf HR before and after intravenous administration of agents to record the motility index (MI), basal pressure, and amplitude, duration and frequency of phasic contraction. Results Administration of somatostatin and stilamin of 0.5 nmol·kg -1 ·h -1 dose could induce phasic contraction of sphincter of Oddi and increase MI. The above two agents of 1 nmol·kg -1 ·h -1 dose could inhibit contractile activity of sphincter and decrease MI. Sandostatin of 0.5 1 nmol·kg -1 ·h -1 dose could induce phasic contraction of sphincter of Oddi; however, the agent of 0.5 nmol·kg -1 ·h -1 dose increased MI while 1 nmol·kg -1 ·h -1 dose had no effect on MI. Conclusion Effects of somatostatin and stilamin are biphasic in the regulation of sphincter of Oddi motility; small dose of the agents stimulates the sphincter motility while large dose inhibits the motility. Sandostatin regulates the sphincter of Oddi motility; the agent of small dose exerts excitatory role while large dose plays no significant role.