Long-term administration of Ziziphus jujuba extract attenuates cardiovascular responses in hypertensive rats induced by angiotensinii

R. Mohebbati, M. Rahimi, Kosar Bavarsad, M. Shafei
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引用次数: 4

Abstract

Objective: The fruit of Ziziphus jujuba (ZJ) traditionally has been used for the treatment of hypertension in Iran. The mechanism of this effect of ZJ is unknown but may be mediated via an effect on the renin-angiotensin system (RAS). This study evaluates the effect of hydroalcoholic ZJ extract on acute hypertension induced by angiotensinII (AngII), a main product of RAS. Materials and Methods: Animals were divided into six groups; 1) saline, 2) AngII that received (50 ng/kg) intravenously (i. v.), 3) Losartan (Los, 10 mg/kg) +AngII group that received Los (i.v.) before AngII and 4-6) three groups of ZJ (100, 200 and 400 mg/kg) that were treated four weeks by gavage and on 28th day of experiment received AngII (i. v.). Cardiovascular responses were recorded by cannulation of the femoral artery and drug injection done via the tail vein. Systolic blood pressure (SBP), Mean arterial pressure (MAP) and heart rate (HR) were recorded continuously by power lab system. Maximal changes (Δ) of SBP,MAP and HR were calculated and compared with those of control and AngII groups. Statistical analysis was performed by one-way ANOVA. Results: In AngII group maximal Δ SBP, ΔMAP significantly increased than in control but ΔHR was not significant. Pretreatment of two lower doses (100 and 200 mg/kg) of ZJ significantly attenuate increased ΔSBP and ΔMAP induced by AngII. In contrast pretreatment with a higher dose (400 mg/kg) significantly increased the ΔSBP and ΔMAP compared to AngII group. The ΔHR only in dose 200 mg/kg was significantly lower than AngII group. Conclusion: Consistent with the traditional view, the results indicate that ZJ extract has an antihypertensive effect, and effect of its lower doses partly mediated by an inhibitory effect on RAS.
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长期服用红枣提取物可减轻血管紧张素所致高血压大鼠的心血管反应
目的:在伊朗,传统上用酸枣果治疗高血压。ZJ的这种作用机制尚不清楚,但可能通过对肾素-血管紧张素系统(RAS)的影响来介导。本研究评价了水酒精ZJ提取物对RAS主要产物血管紧张素ii (AngII)诱导的急性高血压的影响。材料与方法:将动物分为6组;1)生理盐水,2)静脉注射AngII (50 ng/kg) (i.v.), 3)氯沙坦(Los, 10 mg/kg) +AngII组,在AngII之前注射Los (i.v.), 4-6)三组ZJ(100、200、400 mg/kg),灌胃4周,实验第28天注射AngII (i.v.)。通过股动脉插管和尾静脉注射药物记录心血管反应。动力实验系统连续记录收缩压(SBP)、平均动脉压(MAP)和心率(HR)。计算SBP、MAP和HR的最大变化(Δ),并与对照组和AngII组进行比较。统计学分析采用单因素方差分析。结果:AngII组最大Δ收缩压ΔMAP明显高于对照组,ΔHR无显著性增高。低剂量ZJ预处理(100和200 mg/kg)显著减弱AngII诱导的ΔSBP和ΔMAP。相比之下,与AngII组相比,高剂量预处理(400 mg/kg)显著增加ΔSBP和ΔMAP。ΔHR仅200 mg/kg剂量组显著低于AngII组。结论:与传统观点一致,ZJ提取物具有降压作用,其低剂量作用部分是通过抑制RAS作用介导的。
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