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- W2345653133 abstract "Objective:To study the effect of Ginkgo biloba extract(EGb761) on metabolism of aflatoxin B1(AFB1)in Wistar rats.Methods:Seventy one Wistar rats were divided into three groups at random: group A(AFB1 group),group B(AFB1+EGb761 group),and group C(control group).The rats in groups A and B were given AFB1(intraperitoneal injection,100-200 μg/ kg body weight,1-3 times/week).The rats in group B were fed the food containing EGb761 while the rats in groups A and C were given normal food.Blood samples were collected and liver biopsy was performed on the 14th,28th and 42nd week.All the rats were sacrificed at the 64th week.The incidence of hepatoma was observed.The hepatic phase Ⅰ drug-metabolizing enzyme CYP450 and phase Ⅱ enzyme GST were detected by spectrometry.The serum AFB1-lysine adduct was determined by high performance liquid chromatography(HPLC).The expression of 8-hydroxydeoxyguanosine(8-OHdG)was measured by immunohistochemistry.Results:The incidence of hepatocellular carcinoma(HCC) in group B was significantly lower than that in group A(26.92% vs 76.00%,P0.001).No hepatocellular carcinoma developed in group C.EGb761 had no effects on the activities of CYP450 and GST in rat liver tissues.The level of AFB1-lysine adduct reached the peak(4 356.01 pg/mg albumin) at the 14th week in group A.EGb761 significantly inhibited the formation of AFB1-lysine adducts in serum by 13.07% at the 14th week(P=0.033),and 73.63% at the 42nd week(P=0.002).The expression of 8-OHdG protein in rat liver tissues in group B was significantly lower than that in group A at the 28th,42nd,and 64th week(P0.05).Conclusion:The main mechanism underlying the effect of EGb761 in blocking hepatogenesis induced by AFB1 may not be fully related with its influence on the activity of liver phase Ⅰ and phase Ⅱ metabolizing enzymes.EGb761 inhibites the production of AFB1-lysine addcuts,decreases the expression of 8-OHdG protein,and finally alleviates the DNA oxidative injury,which may be one of the mechanisms for the effects of EGb761 in inhibiting or delaying hepatogenesis induced by AFB1." @default.
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- W2345653133 date "2010-01-01" @default.
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- W2345653133 title "Effects of Ginkgo biloba extract on biomarker expressions during aflatoxin B1-induced hepatocarcinogenesis in Wistar rats." @default.
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