Aqueous extract of dioscorea opposita thunb. normalizes the hypertension in 2K1C hypertensive rats.
BACKGROUND
Dioscorea opposita Thunb. (Huai Shan Yao, DOT), a common staple food in China, has been used for more than 2000 years in traditional Chinese medicine (TCM) to treat different systemic diseases including hypertension. The objective of this study was to investigate the possible antihypertensive effects of the aqueous extract of (DOT) in renovascular hypertensive rats as well as the mechanism in reducing blood pressure.


METHODS
The two-kidney one-clip (2K1C) Goldblatt model of renovascular hypertension was used in Wistar rats. Rats with captopril, low-dose DOT and high-dose DOT treated 2K1C groups for 6 weeks. The blood pressure, cardiac mass index (heart weight/body weight), plasma level of angiotensin-II (Ang-II), endothelin-1(ET-1), superoxide dismutase (SOD) and malondialdehyde (MDA) were evaluated.


RESULTS
DOT significantly reduced mean systolic and diastolic blood pressure after treatment. DOT also significantly increased plasma SOD activity but decreased plasma MDA concentration. Renal function was improved with captopril and DOT. DOT reduced plasma Ang-II activity and plasma ET concentration. They couldalso significantly reduce the left ventricular hypertrophy and cardiac mass index.


CONCLUSIONS
Our results suggest that DOT may have an antihypertensive effect on hypertension by inhibit ET-converting enzyme and antioxidant activity, which warrant further exploration.
Traditional Uighur Medicine Institute, Xinjiang Medical University, 830011 Urumqi, Xinjiang, PR China. nur818@hotmail.com.
Nurmuhammat
N
Amat
Raziya
R
Amat
Sajida
S
Abdureyim
Parida
P
Hoxur
Zulpiya
Z
Osman
Dolkun
D
Mamut
Anake
A
Kijjoa
D000804:Angiotensin II / Q000097:blood; D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology / Q000627:therapeutic use*; D000975:Antioxidants / Q000494:pharmacology / Q000627:therapeutic use; D001794:Blood Pressure / Q000187:drug effects; D002216:Captopril / Q000494:pharmacology / Q000627:therapeutic use; D002681:China; D027742:Dioscorea; D004365:Drugs, Chinese Herbal / Q000494:pharmacology / Q000627:therapeutic use*; D019332:Endothelin-1 / Q000097:blood; D006321:Heart / Q000187:drug effects; D006973:Hypertension / Q000097:blood / Q000188:drug therapy; D006978:Hypertension, Renovascular / Q000097:blood / Q000188:drug therapy*; D017379:Hypertrophy, Left Ventricular / Q000188:drug therapy; D007668:Kidney / Q000187:drug effects*; D008297:Male; D008315:Malondialdehyde / Q000097:blood; D018384:Oxidative Stress / Q000187:drug effects*; D008517:Phytotherapy; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000097:blood
D000959:Antihypertensive Agents; D000975:Antioxidants; D004365:Drugs, Chinese Herbal; D019332:Endothelin-1; C473661:huai-shan-yao; D000804:Angiotensin II; D008315:Malondialdehyde; D002216:Captopril; D013482:Superoxide Dismutase