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. 2014 Jan 21:14:36.
doi: 10.1186/1472-6882-14-36.

Aqueous extract of dioscorea opposita thunb. normalizes the hypertension in 2K1C hypertensive rats

Nurmuhammat Amat  1 , Raziya Amat, Sajida Abdureyim, Parida Hoxur, Zulpiya Osman, Dolkun Mamut, Anake Kijjoa
Affiliations

Aqueous extract of dioscorea opposita thunb. normalizes the hypertension in 2K1C hypertensive rats

Nurmuhammat Amat et al. BMC Complement Altern Med. .

Abstract

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.

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Figures

Figure 1
Figure 1
Effect of the aqueous extract of DOT on systolic (SBP), diastolic (DBP) blood pressure (A) and heart weight to body weight ratio (B) in 2K1C hypertensive rats. Values are mean ± SD, n = 10, *P < 0.05 vs. sham; #P < 0.05 vs. model; △P < 0.05 vs. captopril.
Figure 2
Figure 2
Effect of the aqueous extract of DOT on renal function parameters in 2K1C hypertensive rats. Values are mean ± SD, n = 10,*P < 0.05 vs. sham; #P < 0.05 vs. model.
Figure 3
Figure 3
Effect of aqueous extract of DOT on (A) plasma superoxide dismutase (SOD) and (B) plasma malondialchehyche (MDA) in 2K1C hypertensive rats. Values are mean ± SD. n = 10, * p < 0.05 vs. sham; # P < 0.05 vs. model; △P < 0.05 vs. captopril.
Figure 4
Figure 4
Effect of the aqueous extract of DOT on (A) plasma angiotensin-II (Ang-II) and (B) plasma endothelin-1(ET-1) concentrations (pgml-1) in 2K1C hypertensive rats. Values are mean ± SD. n = 10,*P < 0.05 vs. sham; #P < 0.05 vs. model; △P < 0.05 vs. captopril.
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