Effect of purified saponin mixture from Astragalus corniculatus on enzyme- and non-enzyme-induced lipid peroxidation in liver microsomes from spontaneously hypertensive rats and normotensive rats

Simeonova, R.L.; Vitcheva, V.B.; Kondeva-Burdina, M.S.; Krasteva, I.N.; Nikolov, S.D.; Mitcheva, M.K.

doi:10.1016/j.phymed.2009.08.013

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Volume 17, Issue 5 , Pages 346-349, April 2010

Effect of purified saponin mixture from Astragalus corniculatus on enzyme- and non-enzyme-induced lipid peroxidation in liver microsomes from spontaneously hypertensive rats and normotensive rats

R.L. Simeonova
- Laboratory of Drug Metabolism and Drug Toxicity, Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University, 2 Dunav St., 1000 Sofia, Bulgaria
V.B. Vitcheva
- Laboratory of Drug Metabolism and Drug Toxicity, Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University, 2 Dunav St., 1000 Sofia, Bulgaria
- Corresponding author. Tel.: +35929236548; fax: +35929879874.
M.S. Kondeva-Burdina
- Laboratory of Drug Metabolism and Drug Toxicity, Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University, 2 Dunav St., 1000 Sofia, Bulgaria
I.N. Krasteva
- Department of Pharmacognosy, Faculty of Pharmacy, Medical University, 2 Dunav St., 1000 Sofia, Bulgaria
S.D. Nikolov
- Department of Pharmacognosy, Faculty of Pharmacy, Medical University, 2 Dunav St., 1000 Sofia, Bulgaria
M.K. Mitcheva
- Laboratory of Drug Metabolism and Drug Toxicity, Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University, 2 Dunav St., 1000 Sofia, Bulgaria

published online 03 February 2010.

Abstract

The aim of the following study was to evaluate the effect of a purified saponin mixture (PSM), isolated from Astragalus corniculatus Bieb. (Fabaceae), on enzyme-induced and non-enzyme-induced lipid peroxidation (LPO), in liver microsomes from spontaneously hypertensive rats (SHRs) – strain Okamoto Aoki, as compared to normotensive Wistar rats (NTRs).

The enzyme-induced lipid peroxidation was performed by incubating rat liver microsomes with carbonetetrachloride (CCl₄) in the presence of NADPH. In nonenzyme-induced LPO, the microsomes were incubated with a solution of iron sulphate and ascorbinic acid (Fe²⁺/AA). The effect of PSM (196.5μg/ml) was assessed at 20 minutes’ incubation time. MDA, a product of LPO, was measured spectrophotometrically.

The results of our study showed that the initial MDA quantity in SHRs was significantly higher, than in NTRs. The incubation of the microsomes from both strains with PSM (196.5μg/ml), resulted in significant reduction of MDA level, by 25% in SHRs. In NTRs, the formation of MDA was unchanged.

In enzyme-induced LPO model, PSM significantly decreased the formation of MDA, by 55% in NTRs and by 35% in SHRs, compared to the respective control groups. In the model of non-enzyme induced LPO, PSM significantly decreased the formation of MDA by 95% in NTRs and practically restored it to the control level. The MDA quantity in SHR's microsomes was reduced by 25%.

According to the results of this experiment we could conclude that PSM, isolated from Astragalus corniculatus, shows antioxidant activity both in SHRs and NTRs and the effect in NTRs is more pronounced.

Keywords: Astragalus corniculatus, Antioxidant activity, Lipid peroxydation, SHR