...
首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Characteristics of emodin on modulating the contractility of jejunal smooth muscle
【24h】

Characteristics of emodin on modulating the contractility of jejunal smooth muscle

机译:大黄素对空肠平滑肌收缩力的调节作用

获取原文
获取原文并翻译 | 示例
           

摘要

Emodin is traditionally used as a laxative and is found to increase or decrease the contractility of intestinal smooth muscle in low doses and high doses, respectively. In this study, we propose that bidirectional regulation (BR) on the contractility of jejunal smooth muscle (CJSM) is inducible by emodin in the absence of control by the central nervous system. The results indicated that emodin-induced BR had the following characteristics. A stimulatory effect on CJSM was induced by emodin at 7 low contractile states, and an inhibitory effect was induced on CJSM at 7 high contractile states. Emodin-induced BR on myosin phosphorylation was also observed. BR was notobserved in the presence of tetrodotoxin, suggesting that enteric nervous system is required for producing BR. The stimulatory effect of emodin on CJSM was abolished by atropine and diphenhydramine, respectively, suggesting that BR was correlated with cholinergic and histamine system while jejunal smooth muscle was at low contractile state. The inhibitory effect of emodin on CJSM was abolished by phentolamine, propranolol, and L-NG-nitroarginine (L-NNA), respectively, suggesting that BR was related to adrenergic hyperactivity and with a nitric oxide relaxing mechanism while jejunal smooth muscle was in a high contractile state. The exact mechanism, however, needs further investigation.
机译:大黄素在传统上被用作泻药,被发现分别在低剂量和高剂量下增加或减少肠道平滑肌的收缩力。在这项研究中,我们建议在没有中枢神经系统控制的情况下,大黄素可以诱导对空肠平滑肌(CJSM)收缩力的双向调节(BR)。结果表明,大黄素诱导的BR具有以下特征。大黄素在7种低收缩状态下对CJSM有刺激作用,在7种高收缩状态下对CJSM有抑制作用。还观察到大黄素诱导的肌球蛋白磷酸化的BR。在河豚毒素的存在下未观察到BR,这表明产生BR需要肠神经系统。大黄素和苯海拉明分别取消了大黄素对CJSM的刺激作用,提示BR与空肠平滑肌处于低收缩状态时与胆碱能和组胺系统有关。大黄素对苯丙胺,普萘洛尔和L-NG-硝基精氨酸(L-NNA)的抑制作用均被取消,这表明BR与肾上腺素能亢进有关,并且在空肠平滑肌处于饱和状态时具有一氧化氮松弛机制。高收缩状态。但是,确切的机制需要进一步研究。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号