麦胚黄酮类提取物对荷瘤大鼠的抗氧化作用

为研究由麦胚提取的黄酮类化合物对 7,12 二甲基苯蒽 (DMBA)诱发大鼠乳腺肿瘤的抑制作用 ,将出生 5 0天的雌性SD大鼠随机分为阴性对照组、阳性对照组、低剂量实验组和高剂量实验组。阳性及阴性对照组大鼠喂基础饲料 ,除阴性对照组外的 3组大鼠经灌胃给致癌剂DMBA(每只 15mg溶于 1 5ml的植物油中 ) ,低 高剂量实验组大鼠同时给含麦胚黄酮类提取物的饲料 (分别为 2和 10g kg) ,持续喂养 2 4周。结果表明 ,高剂量组大鼠乳腺肿瘤的发生率较阳性对照组显著降低 ,实验组大鼠血液及肝脏中谷胱甘肽过氧化物酶活性和超氧化物歧化酶活性较阳性对照组大鼠有明显增加 ,丙二醛含量下降。提示麦胚提取的黄酮类化合物对抗过氧化物酶的诱导作用可能是其对乳腺癌具有化学预防作用的机制之一。

Antioxidation of flavones of wheat germ on mammary tumor of rats

The effect of flavonoids of wheat germ on mammary tumor of rats induced by 7,12|dimethylben(a) anthracene (DMBA) was investigated. Sprague|Dawley female rats (50 day|old, weighted around 176g) were randomly divided into 4 groups. The negative and positive control group were fed on stoke diet. The high and low dose test groups were fed on diets with wheat germ flavonoids 10 and 2g/kg respectively. Except rats in the negative control group, each rat was given DMBA 15 mg dissolved in 1 5ml vegetable oil by tube feeding. After the administration of DMBA for 24 weeks, the incidence of tumor in the high dose test group was lower than that in the positive control group. The activity of blood and liver glutathione peroxidase (GSH|Px) and peroxidase dismutase(SOD)in the test groups was significantly higher than those in the positive control group, while the MDA level was significantly lower. The results suggested that the effect of flavonoids on inducing peroxidase might be one of the chemical prevention mechanisms on mammary tumors.