银杏黄酮对小鼠急性酒精摄入后抗氧化系统的影响

目的　研究急性酒精摄入对小鼠肝脏抗氧化系统的影响及银杏黄酮的保护作用。方法　选用昆明种成年雄性小鼠,按体重随机分为黄酮干预组(银杏黄酮96mg kgbw +乙醇4 8g kgbw)、正常对照组和酒精对照组(乙醇4 . 8g kgbw)。小鼠经口给予干预物或对照物(生理盐水) ,0 . 5h再给予酒精,然后于酒精灌胃后0 . 5、1、2、4、6、9、15h后处死,另设正常对照组,测定小鼠血清与肝脏谷胱甘肽(GSH)、谷胱甘肽过氧化物酶(GSH -Px)、超氧化物岐化酶(SOD)及丙二醛(MDA)的活性或含量。结果　小鼠一次性摄入大剂量的乙醇,GSH水平及SOD、GSH -Px活性在1h后迅速下降,4h时降至最低点,随后迅速恢复至正常水平;血清与肝脏MDA水平在1h后迅速上升,分别于4h和6h时升至最高点,15h和9h时才缓慢恢复至正常水平。经银杏黄酮干预后,肝脏GSH- Px、SOD活性与GSH、MDA水平的变化曲线与酒精对照组基本相似,但GSH、GSH Px、SOD的降幅明显低于酒精对照组,MDA的升幅也明显低于酒精对照组。结论　小鼠急性摄入酒精后表现出明显的氧化损伤,而银杏黄酮对这种氧化损伤具有一定的保护作用。

Effect of flavonoids of ginkgo biloba on anti-oxidizing system of mice after acute alcohol administration

Objective To investigate the protective effects of flavonoids of ginkgo biloba on anti-oxidizing system damaged by acute alcohol administration. Methods Adult male Kunming mice were employed and divided into randomly flavonoid intervention group, normal control and ethanol control group according to body weight. After pretreated with flavonoids of ginkgo biloba (96mg/kg bw), the mice in flavonoid intervention group ingested alcohol (ethanol 4.8g/kg bw) via i.g. and were decapitated after 0.5, 1, 2, 4, 6, 9, and 15h of ethanol administration. The same treatment was carried out on ethanol control group except that physiological saline was applied instead of flavonoid of ginkgo biloba. Meanwhile, the normal control group was established. Results The concentration of glutathione (GSH),malondialdehyde (MDA) and the activity of glutathione peroxidase (GSH-Px), superoxide dismutase (SOD) in the serum and liver were determined. The experiment displays that the content of GSH and the activities of GSH-Px and SOD decreased rapidly after 1h of treatment with alcohol and dropped to the lowest level at 4h of treatment. After 6h of treatment, these indexes came to the normal level rapidly. The level of MDA of serum and liver increased rapidly after 1h of treatment and reached the climax at 4h and 6h respectively. It went back to the normal concentration until 15h and 9h respectively. On a whole, there were similar curves between flavonoids intervention group and alcohol control group on the indexes. However, to some extent, the supplement of flavonoid of ginkgo biloba can prohibit the rise of MDA level and the decline of GSH-Px, SOD, GSH which were induced by acute alcohol intakes. Conclusion Flavonoid of ginkgo biloba have some protective effects on the damage of anti-oxidizing system of mice induced by acute alcohol adminstration.