Antihypertensive efficacy of extract of Hedera helix in high salt-induced hypertensive Sprague-Dawley rats
Antihypertensive efficacy of extract of Hedera helix in high salt-induced hypertensive Sprague-Dawley rats作者机构：Cardiovascular Research Group Department of Pharmacy COMSATS University IslamabadAbbottabad campus
出 版 物：《Asian Pacific Journal of Tropical Medicine》 (亚太热带医药杂志（英文版）)
年 卷 期：2018年第11卷第8期
页 面：473-479页
核心收录：
学科分类：1006[医学-中西医结合] 1002[医学-临床医学] 10[医学] 100602[医学-中西医结合临床]
主 题：Hedera helix Antihypertensive Vasorelaxant Endothelium-dependent Nitric oxide Calcium channel blocker
摘 要：Objective: To explore the antihypertensive effect of extracts from the leaves of Hedera helix(H. helix) on normotensive and hypertensive rats in-vivo followed by vasodilatory studies in-vitro.Methods: The crude methanolic extract was prepared and the activity directed fractionation was carried out. Spectrophotometric analysis of total phenolic and flavonoid content was also done. HPLC analysis was performed for the detection of hederacoside C. In-vivo blood pressure study was carried out in normotensive and high salt-induced hypertensive SpragueDawley rats. Isolated aortic tissues from rat and rabbit were used for in-vitro studies. The effects were recorded and analyzed through PowerL ab data acquisition system. Results: Crude extract of H. helix(1-30 mg/kg) decreased blood pressure to greater extent in high salt-induced hypertensive rats in-vivo compared to the normotensive [Max. fall(58.59±0.02) mm Hg vs.(67.53±3.07) mmH g]. The n-hexane, chloroform, ethyl acetate and aqueous fractions were also checked. These fractions were more effective in hypertensive rats. Aqueous fraction was more potent and n-hexane the least. In isolated rat aortic rings precontracted with phenylephrine, crude extract induced endothelium-dependent effect. The endothelium-dependent component of vasodilatory effect was ablated with L-NAME, and denudation of endothelium. The aqueous fraction was most potent vasodilator. In aortic rings from hypertensive rats, extract and fractions produced partial endothelium-independent effect which was not affected by pretreatment with L-NAME, indicating endothelium dysfunction in the hypertensive rats and suggesting additional vasodilatory mechanisms. In rabbit aorta, the extract and fractions also inhibited phenylephrine and high K^+-induced precontractions, and shifted Ca^(++) concentration–response curves. Conclusions: Our findings indicate that extract and fractions of H. helix are antihypertensive remedies, which is the outcome of vasodilatory effect. This vasodilatory effect is mediated through nitric oxide and Ca^(++) antagonism.
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