Document Detail

Antihypertensive effect of total flavonoid fraction of Astragalus complanatus in hypertensive rats.
MedLine Citation:
PMID:  16201455     Owner:  NLM     Status:  MEDLINE    
The purpose of the present study was to quantify the antihypertensive effect of the total flavonoid (TF), extracted from the seed of Astragalus complanatus R. Brown, and to observe its effect on the renin-angiotensin system (RAS) in both renal hypertensive rats (RHR) and spontaneously hypertensive rats (SHR). RHR were created by the two-kidney one clip (2K1C) method. Systolic blood pressure was measured in conscious rats by the tail-cuff method. Plasma angiotensin II (AngII) and plasma renin activity (PRA) were measured with radioimmunoassay at 60 min after drug administration. The effects of TF on cardiac hemodynamics were also recorded in anesthetized RHR and SHR. TF was given by oral administration in low dose (100 mg/kg) and high dose (200 mg/kg) respectively. Compared to pre-administration control, TF induced an obvious decrease in systolic blood pressure in conscious normotensive Wistar rat, RHR and SHR. In the three groups the systolic blood pressure reached the lowest value at 60 min after TF. TF also induced a significant decrease in blood pressure in anesthetized RHR and SHR. At 60 min after treatment of TF, mean arterial pressure in high dose group (200 mg/kg) was decreased by 17% in RHR and by 17% in SHR respectively (P < 0.01). The depressor effect of TF lasted for at least 60 min. Cardiac output, heart rate and +/- dp/dtmax did not change. Conversely, total peripheral resistance was significantly decreased. The decrease in plasma AngII was found in both RHR and SHR. On the contrary, PRA increased at the same time. These findings suggested that TF is effective in reducing blood pressure in both RHR and SHR. The antihypertensive action of TF was attributed to a decrease in TPR secondary to a decrease in plasma concentration of AngII caused by TF.
Jing-Xin Li; Bing Xue; Qiang Chai; Zhi-Xiang Liu; Ai-Ping Zhao; Lian-Bi Chen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Chinese journal of physiology     Volume:  48     ISSN:  0304-4920     ISO Abbreviation:  Chin J Physiol     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-10-05     Completed Date:  2005-10-21     Revised Date:  2009-08-12    
Medline Journal Info:
Nlm Unique ID:  7804502     Medline TA:  Chin J Physiol     Country:  China (Republic : 1949- )    
Other Details:
Languages:  eng     Pagination:  101-6     Citation Subset:  IM    
Institute of Physiology, School of Medicine, Shandong University, Shandong 250012, P.R. China.
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MeSH Terms
Angiotensin II / blood
Antihypertensive Agents / pharmacology*
Astragalus Plant / chemistry*
Flavonoids / pharmacology*
Heart Rate / drug effects
Hypertension / drug therapy*
Rats, Inbred SHR
Rats, Wistar
Renin / blood
Systole / drug effects
Reg. No./Substance:
0/Antihypertensive Agents; 0/Flavonoids; 11128-99-7/Angiotensin II; EC

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