大豆异黄酮对去卵巢大鼠体重及食物利用率的影响

目的研究植物雌激素大豆异黄酮对模拟妇女绝经的去卵巢大鼠体重增加的抑制作用及其降低体内食物利用率的作用。方法4月龄雌性Wistar大鼠腹腔假手术或切除双侧卵巢,分为假手术对照组(Sham)、去卵巢对照组(Ovx)、雌激素对照组(EC)和3个大豆异黄酮剂量组,另设正常对照组。用自行配制的含有己烯雌酚和不同剂量大豆异黄酮的饲料喂养16周,实验期间记录各组大鼠的体重和摄食情况,并计算食物利用率。结果高剂量大豆异黄酮(187.4mgkgbw·d)和己烯雌酚可显著抑制大鼠去卵巢后的体重增加;剂量降低,抑制作用减弱。与Sham组和Ovx组相比,大豆异黄酮组大鼠摄食量显著降低,但3个剂量组间没有差异且高于EC组。与OVX组相比,高剂量大豆异黄酮组大鼠食物利用率显著降低,但高于EC组。大豆异黄酮对大鼠的生长状态及脏体比值没有影响。结论高剂量大豆异黄酮可通过降低体内食物利用率而显著抑制大鼠去卵巢后体重的增加。

Effects of soybean isoflavone on body weight and food utilization rate in ovariectomized rats

OBJECTIVE: To investigate the inhibitory action of phytoestrogen soybean isoflavone on body weight increasing in ovariectomized rats that imitated postmenopausal women and the effect of decreasing food availability. METHODS: Four-month-old Wistar rats were sham-operated or ovariectomized by abdominal cavity operation and divided into Sham, Ovx, estrogen group(EC) and three isoflavone group and feed 16 weeks. The diet was prepared by ourselves and some contained diethylstilbestrol or different concentration of isoflavone. During the experiment, the rats weight and food intake were recorded. The food utilization rates of each group were calculated. RESULTS: The result showed that high dosage of soybean isoflavone (187.4 mg/kg bw x d) can significantly inhibited OVX induced weight gain and inhibitory action decreased with the dose reduce. Compared with Sham and Ovx group, the food intake of isoflavone group decreased significantly but no different in 3 dosage group and higher than EC group. Compared with Ovx group, the food utilization rates of high isoflavone group decreased significantly but higher than EC group. Isoflavone not influenced the growth and organ/body rates of rats. CONCLUSION: High dosage of isoflavone (187.4mg/kg bw x d) decreased OVX rat's weight gain significantly through reducing food utilization rate.