染料木素和大豆苷元对去卵巢大鼠胆固醇代谢的影响

目的　观察大豆异黄酮的两种主要苷元染料木素(Gen)和大豆苷元 (Dai)对去卵巢大鼠胆固醇代谢的影响。方法　Wistar大鼠 70只 ,随机分成正常组、模型组、雌激素组、大剂量G组、小剂量G组、大剂量D组、小剂量D组 ,每组 10只。除正常组外 ,其余各组均切除双侧卵巢。术后 1wk开始给药 ,给药 6wk后处死动物 ,测定血清总胆固醇(sTC)、血清低密度脂蛋白胆固醇 (LDL C)、血清高密度脂蛋白胆固醇 (HDL C)、肝组织中胆固醇 (hTC)含量。结果　切除卵巢 7wk后大鼠sTC ,LDL C ,hTC均增高。雌激素可降低去卵巢大鼠sTC、LDL C和hTC ,对HDL C作用不明显 ;染料木素可降低sTC、hTC、升高HDL C ,但对LDL C作用不明显 ;大豆苷元可降低sTC、hTC、LDL C ,但对HDL C作用不明显。结论　染料木素和大豆苷元均可降低去卵巢大鼠sTC和hTC水平 ,但作用途径不同 ;作用效果大豆苷元优于染料木素

Effects of genistein and daidzein on cholesterol metabolism in ovariectomized rats

AIMTo study effects of genistein and daidzein on chole sterol levels in serum of ovariectomized rats. METHODS70 Wistar rats were randomly divided into 7 groups: control group, model group, estrogen g roup, genistein groups of high dose and low dose, daidzein groups of high dose a nd low dose with 10 rats in each group. All rats were ovariectomized except for that of the control group. One week after operation, the soyisoflavones were ad ministrated with different dose of genestein and daidzein for 6 weeks. Six weeks after operation, the rats were killed, with serum and liver taken, and the leve ls of total serum cholesterol (sTC), low-density lipoprotein cholesterol (LDL- C), high-density lipoprotein cholesterol (HDL-C) and total liver homogenate ch olesterol (hTC), were measured. RESULTSThe level of sTC, hTC, LDL-C in serum of ovariectomized rats of model group increased significantly, c ompared with control group. Eestrogen reduced the levels of sTC, hTC and LDL-C, but had no effects on the levels of the HDL-C. Genistein reduced the levels of sTC, hTC and increased the level of the HDL-C, but had no effect on that of LD L-C. Daidzein reduced the levels of sTC, hTC, LDL-C, but had no effect on the level of the HDL-C. CONCLUSIONGenistein and daidzein suppressed the increase of cholesterol levels of serum in ovariectomized rats through deff erent pathways. The effect of daidzein on serum cholesterol level of rats is mor e potent than that of genistein.veloftheHDL C .CONCLUSION　Genistein