首页> 外文期刊>Japanese Journal of Pharmacology >Central α2-Adrenoceptor-Mediated Pressor Response to Clonidine in Conscious, Spontaneously Hypertensive Rats
【24h】

Central α2-Adrenoceptor-Mediated Pressor Response to Clonidine in Conscious, Spontaneously Hypertensive Rats

机译:自觉,自发性高血压大鼠中枢α2-肾上腺素受体介导的对可乐定的升压反应

获取原文
           

摘要

References(27) Cited-By(13) Pressor responses to intracerebroventricular (i.c.v.) injection of clonidine were investigated in conscious spontaneously hypertensive rats (SHR) and normotensive Wistar Kyoto rats (WKY). Clonidine (1-10 μg, i.c.v.) caused a dose-dependent pressor response and decrease in heart rate in both SHR and WKY. In SHR, low doses (1, 2.5 μg) but not high doses (5, 10 μg) of i.c.v.-clonidine induced a depressor response following the pressor response. Both pressor and depressor responses to i.c.v.-clonidine were significantly greater in SHR than in WKY. In both SHR and WKY, pressor responses to i.c.v.-clonidine were abolished by pentobarbital anesthesia, pretreatment with i.v.-furosemide (5 mg/kg), 24-hr water deprivation and pretreatment with i.c.v.-yohimbine (100 μg), but not by pretreatment with i.v.-yohimbine (100 μg) and i.c.v.-prazosin (10 μg). On the 1st day after surgery for arterial catheter implantation, SHR reduced their water intake, and i.c.v.-clonidine (5 μg) caused a slight pressor response, whereas the same dose of clonidine on the 7th day after surgery resulted in a marked pressor response. These results suggest that clonidine caused a central α2-adrenoceptor-mediated pressor response, which is greater in SHR than in WKY and is sensitive to body fluid volume changes and anesthesia.
机译:参考文献(27)被引用(13)(13)在有意识的自发性高血压大鼠(SHR)和血压正常的Wistar Kyoto大鼠(WKY)中研究了脑室内(i.c.v.)注射可乐定的升压反应。可乐定(1-10μg,i.c.v.)在SHR和WKY中均引起剂量依赖性的升压反应并降低心率。在SHR中,低剂量(1,2.5μg)但不是高剂量(5,10μg)的i.c.v.可乐定会在升压反应后引起降压反应。在SHR中,对i.c.v.可乐定的升压和降压反应均明显高于WKY。在SHR和WKY中,戊巴比妥麻醉,iv-呋塞米(5 mg / kg)预处理,24小时缺水和icv-育亨宾(100μg)预处理消除了对icv-可乐定的升压反应。含IV-育亨宾(100μg)和icv-哌唑嗪(10μg)。在进行动脉导管植入手术后的第一天,SHR减少了水的摄入量,而i.c.v.可乐定(5μg)引起了轻微的升压反应,而在手术后的第七天,相同剂量的可乐定导致了明显的升压反应。这些结果表明,可乐定引起了中枢α2-肾上腺素受体介导的升压反应,在SHR中比在WKY中更大,并且对体液量变化和麻醉敏感。

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