Hemodynamic and renin responses to (+-)-DOI, a selective 5-HT2 receptor agonist, in conscious rats.

Hemodynamic and renin responses to (+-)-DOI, a selective 5-HT2 receptor agonist, in conscious rats.
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清醒大鼠对 (-)-DOI(一种选择性 5-HT2 受体激动剂)的血流动力学和肾素反应。

DOI:
10.1016/0014-2999(90)90571-m
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发表时间:
1990
影响因子:
5
通讯作者:
Alper,RH
Alper,RH
中科院分区:
医学2区
文献类型:
--
作者:
Alper,RH

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本文观察了选择性5-HT2激动剂(±)-1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane对清醒大鼠动脉压(AP)、心率(HR)、肾血流量(RBC)和血浆肾素活性(PRA)的影响。DOI增加AP和PRA,降低HR和RBF。中枢性(LY 53857)或外周性(二甲双胺)5-HT2拮抗剂均可取消对DOI的所有反应。哌唑嗪不改变AP或HR对DOI的反应。氯松达明可消除DOI引起的心动过缓,但使DOI引起的高血压略有增加,而依那普利可减弱升压反应。依那普利和哌唑嗪联合应用未见进一步的降压作用。心得安可减弱肾素反应,但不能消除肾素反应,并阻断DOI诱发的心动过缓。结果提示,DOI可兴奋血管平滑肌和/或脑室周器官上的5-HT2受体,从而:(1)增加AP,反射性降低HR;(2)减少RBF;(3)增加PRA。高血压是由血管紧张素II和直接的血管效应介导的,而PRA的增加是交感神经活性增加和肾脏灌流压降低的交互作用所介导的。
The effect of the selective 5-HT2agonist (±)-1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane HCl (DOI) on arterial pressure (AP), heart rate (HR), renal blood flow (RBF) and plasma renin activity (PRA) was determined in conscious rats. DOI increased AP and PRA, but decreased HR and RBF. All responses to DOI were abolished by central (LY 53857) or peripheral (xylamidine) 5-HT2antagonists. Prazosin did not alter the AP or HR response to DOI. Chlorisondamine abolished the bradycardia but slightly increased the hypertension produced by DOI, while enalapril attenuated the pressor response. No further reduction was produced by the combination of enalapril and prazosin. Propranolol attenuated but did not eliminate the renin response, and blocked the bradycardia elicited by DOI. The data suggest that DOI activates 5-HT2receptors located on vascular smooth muscle and/or the circumventricular organs of the brain to: (1) increase AP and reflexly decrease HR, (2) decrease RBF and (3) increase PRA. The hypertension is mediated by angiotensin II and direct vascular effects whereas the increase in PRA is mediated by an interaction of increased sympathetic nerve activity and decreased renal perfusion pressure.
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