Effect of soyasaponin on drug resistance of ovarian cancer cells / 中国药理学通报

Aim To screen the most effective soyasa-ponins for reversing the drug resistance of ovarian cancer cells, and investigate the possible mechanism. Methods Cell viability assay was used to analyze the drug resistance of A2780/PTX cells treated with four different common soyasaponins respectively,in order to screen out the most effective soyasaponin. Then, the most effective soyasaponin was used to detect the ex-pression of epithelial-mesenchymal transition ( EMT)-related marker proteins, including N-cadherin and E-cadherin,with Western blot and confocal microsco-py. Finally, transwell assay and wound healing assay were applied to observe effect of soyasaponin on regula-ting cancer cell migration. Results Compared with other soyasaponins,soyasaponin Ac most effectively re-versed the drug resistance of A2780/PTX cells. The expression of N-cadherin decreased while that of E-cadherin increased in A2780/PTX cells when treated with soyasaponin Ac for 48 h. The results of transwell and wound healing assay suggested that soyasaponin Ac also reduced the migration of A2780/PTX cells. Con-clusion Soyasaponin Ac can decrease the drug resist-ance via EMT pathway and weaken the migration abili-ty of ovarian cancer cells.

Optimization of processes for recovery of soyasaponins from bean product waste by orthogonal design / 中草药

Object To optimize the process for the recovery of soyasaponins from bean product waste. Methods Conditions for the recovery were studied by orthogonal design guided by the yield of soya-saponins as determined by UV absorbance. Results The most influential factor in the recovery by refluxing was the concentration of alcohol; while in the recovery by percolation the influential factors were in the order of concentration of ethyl alcohol, amount of alcohol used and the rate of percolation.Conclusion The optimal recovery process was found to be a single reflux with eight times of 60% alcohol for 2.5 h.

EFFECT OF SOYASAPONINS IN PREVENTION OF HYPERLIPIDEMIA IN MICE AND ITS MOLECULAR MECHANISM / 营养学报

Objective: To investigate effect of soyasaponins in the prevention of hyperlipidemia in mice and its molecular mechanism. Methods: 56 healthy mice were randomly divided into 7 groups according to their levels of TC in serum: normal control, high fat control, high fat with 20mg/kg.d gypenosides,high fat with soyasaponins of four doses(5 mg/kg.d, 10mg/kg.d, 20mg/kg.d, 30 mg/kg.d). Results: As compared to high fat control soyasaponins significantly reduced the serum TC, LDL-C, TG concentrations, and increased the HDL-C levels distinctly. They significantly deceased MDA content, increased the activities of SOD and LPL in liver. The results of RT-PCR showed that high fat feeding could induce the reduction of LPL mRNA expression, while soyasaponins could increase it. Conclusion: Soyasoponins prevent hyperlipidemia through upregulation of LPL mRNA expression and increase of antioxidative capacity.

THE HYPOGLYCEMIC EFFECTS OF SOYBEAN HYPOCOTYL EXTRACT IN DIABETIC RATS AND THEIR MECHANISM / 营养学报

Objective: To study the hypoglycemic effects of soybean isoflavones (SI) and soyasaponins (SS) in diabetes, and their inhibitory activities on alpha-glucosidase (EC 3.2.1.20) and alpha-amylase (EC 3.2.1.1). Methods: GK/Jcl type 2 diabetic rats were given diet containing 20 g/kg of soybean hypocotyl extracts (SHE) for 20 weeks, then the blood glucose and oral glucose tolerance test were observed. SI and SS were isolated by ODS column chromatography and high-performance liquid chromatography (HPLC) from SHE. The inhibitory activities of each component of SI and SS against alpha-glucosidase and alpha-amylase were tested by colorimetric method. Results: SHE decreased blood glucose significantly in type 2 diabetic rats and improved glucose tolerance in both normal and diabetic rats. In alpha-glucosidase inhibitory assay, Group B, Group E and DDMP (2,3-dihydro-2,5-dihydroxy-6-methyl-4H-pyran-4-one) saponins showed potent inhibitory activities with IC50 values of 10-40 靘ol/L. Isoflavone aglycones also showed potent inhibitory activities against alpha-glucosidase with IC50 values of 20-150 mol/L, while isoflavone glycosides showed a little lower potencies. Inhibition of SI and SS on alpha-amylase was low, and their inhibitory activities were about 10%~20% at the concentration of 1g/L. Conclusion: SI and SS may decrease blood glucose and improve oral glucose tolerance in diabetic rats, probably via the inhibitory effects on alpha-glucosidase and alpha-amylase.