AIM To study the protective effects of the new standardized preparation of Ginkgo biloba extracts(GBE50) anainst brain mitochondrial damages induced by hyperlipemia in rats. METHODS Rat model with hyperlipemia was est...AIM To study the protective effects of the new standardized preparation of Ginkgo biloba extracts(GBE50) anainst brain mitochondrial damages induced by hyperlipemia in rats. METHODS Rat model with hyperlipemia was established by feeding the young male SD rats (3 weeks after born) with high lipid food for 3 months. Then the rats were treated with different dosage of GBE50(ig) for 4 weeks. The prophylaxis rat group were fed with the mixture of high lipid food and GBE50 (50mg/kg/d). The brain mitochondria was separated for determination of the R3, R4 and RCR of the respiration function with the method of Clark's electrode. The mitochondrial transmembrane potential(Δψm) was derected by the Rho123 assay and the cytochrome c release was checked by spectrography. In addition, the parameters of oxidative stress (the activities of SOD, GSH-Px, and the MDA leve) and the activities of ATPase were assayed.展开更多
The content of total flavonoids in an extract of Ginkgo biloba, called GBE50, is 44% by weight. This is significantly greater than that in a standard extract of Ginkgo biloba, designated EGB761. To date, the mechanism...The content of total flavonoids in an extract of Ginkgo biloba, called GBE50, is 44% by weight. This is significantly greater than that in a standard extract of Ginkgo biloba, designated EGB761. To date, the mechanisms by which GBE50 and EGB761 function remain poorly understood. In the present study, an experimental rat model of aging was induced by intraperitoneal injection of D-galactose, followed by intragastric perfusion of GBE50 （30, 60 mg/kg）, or EGB761 （60 mg/kg）. The water maze scores and hippocampal CA1 synaptic plasticity were evaluated. In the place navigation test, the GBE50 group rats did better than EGB761, while similar scores were obtained in the spatial probe test, and in the platform-switched test. In addition, long-term potentiation was significantly enhanced following high-frequency stimulation in the GBE50 and EGB761 groups, compared with the model group. These results demonstrate that GBE50 and EGB761 improved the learning and memory of aging rats. In particular, GBE50 administered at the 60 mg/kg dose exhibited superior effects over EGB761 at the same 60 mg/kg dose. Furthermore, the enhancement of hippocampal synaptic plasticity may be an underlying mechanism.展开更多
[目的]观察银杏叶提取物(GBE50)对脂多糖(LPS)诱导的人脐静脉内皮细胞(HUVECs)氧化低密度脂蛋白受体(lectin like oxidized low density lipoprotein receptor,LOX-1)表达的影响。[方法]应用LPS刺激体外培养的HUVECs 24h。RT-PCR方法检...[目的]观察银杏叶提取物(GBE50)对脂多糖(LPS)诱导的人脐静脉内皮细胞(HUVECs)氧化低密度脂蛋白受体(lectin like oxidized low density lipoprotein receptor,LOX-1)表达的影响。[方法]应用LPS刺激体外培养的HUVECs 24h。RT-PCR方法检测(lectin like oxidized low density lipoprotein receptor mRNA,LOX-1 mRNA)表达水平;采用蛋白质印迹分析检测LOX-1蛋白表达水平。[结果]LPS(1μg/mL)上调LOX-1 mRNA和蛋白表达水平,GBE50(40μg/mL)轻度抑制LPS介导的LOX-1 mRNA(P<0.005)和蛋白表达增加(但没有统计学意义,P>0.05),GBE50(80μg/mL)及NF-κB抑制剂CAPE(20μg/mL)明显抑制LOX-1 mRNA和蛋白表达上调(P<0.01)。[结论]GBE50可能通过抑制LOX-1表达,在防治动脉粥样硬化中发挥作用。展开更多
文摘AIM To study the protective effects of the new standardized preparation of Ginkgo biloba extracts(GBE50) anainst brain mitochondrial damages induced by hyperlipemia in rats. METHODS Rat model with hyperlipemia was established by feeding the young male SD rats (3 weeks after born) with high lipid food for 3 months. Then the rats were treated with different dosage of GBE50(ig) for 4 weeks. The prophylaxis rat group were fed with the mixture of high lipid food and GBE50 (50mg/kg/d). The brain mitochondria was separated for determination of the R3, R4 and RCR of the respiration function with the method of Clark's electrode. The mitochondrial transmembrane potential(Δψm) was derected by the Rho123 assay and the cytochrome c release was checked by spectrography. In addition, the parameters of oxidative stress (the activities of SOD, GSH-Px, and the MDA leve) and the activities of ATPase were assayed.
基金the Scientific Research Program of the Shanghai Science and Technology Commission,No.09ZR1432100the Key Subject Construction Program of Shanghai Education Commission,No.J50301the Scientific Research Innovation Program of Shanghai Education Commission,No.08YZ59
文摘The content of total flavonoids in an extract of Ginkgo biloba, called GBE50, is 44% by weight. This is significantly greater than that in a standard extract of Ginkgo biloba, designated EGB761. To date, the mechanisms by which GBE50 and EGB761 function remain poorly understood. In the present study, an experimental rat model of aging was induced by intraperitoneal injection of D-galactose, followed by intragastric perfusion of GBE50 （30, 60 mg/kg）, or EGB761 （60 mg/kg）. The water maze scores and hippocampal CA1 synaptic plasticity were evaluated. In the place navigation test, the GBE50 group rats did better than EGB761, while similar scores were obtained in the spatial probe test, and in the platform-switched test. In addition, long-term potentiation was significantly enhanced following high-frequency stimulation in the GBE50 and EGB761 groups, compared with the model group. These results demonstrate that GBE50 and EGB761 improved the learning and memory of aging rats. In particular, GBE50 administered at the 60 mg/kg dose exhibited superior effects over EGB761 at the same 60 mg/kg dose. Furthermore, the enhancement of hippocampal synaptic plasticity may be an underlying mechanism.
文摘[目的]观察银杏叶提取物(GBE50)对脂多糖(LPS)诱导的人脐静脉内皮细胞(HUVECs)氧化低密度脂蛋白受体(lectin like oxidized low density lipoprotein receptor,LOX-1)表达的影响。[方法]应用LPS刺激体外培养的HUVECs 24h。RT-PCR方法检测(lectin like oxidized low density lipoprotein receptor mRNA,LOX-1 mRNA)表达水平;采用蛋白质印迹分析检测LOX-1蛋白表达水平。[结果]LPS(1μg/mL)上调LOX-1 mRNA和蛋白表达水平,GBE50(40μg/mL)轻度抑制LPS介导的LOX-1 mRNA(P<0.005)和蛋白表达增加(但没有统计学意义,P>0.05),GBE50(80μg/mL)及NF-κB抑制剂CAPE(20μg/mL)明显抑制LOX-1 mRNA和蛋白表达上调(P<0.01)。[结论]GBE50可能通过抑制LOX-1表达,在防治动脉粥样硬化中发挥作用。
