Objective: To investigate the death mode of human hepatoma cells exposed to matrine and the role of glutathione (GSH) and cytochrome c. Methods: The MTT test and Cell Death Detection ELISA were used to identify cell d...Objective: To investigate the death mode of human hepatoma cells exposed to matrine and the role of glutathione (GSH) and cytochrome c. Methods: The MTT test and Cell Death Detection ELISA were used to identify cell death mode and viability of cells exposed to matrine. The volume of intracellular GSH was detected by GSH reductase. Finally Western blotting was chosen to analyze the expression of cytochrome c and Caspase-9 in HepG2 cells treated by matrine. Results: The apop-totic cell death induced by matrine in Hep G2 cells dramatically increased in the time-, dose-dependent manner. Matrine can exhaust intracellular GSH effectively to change the redox state in cells. Furthermore it affect the cytotoxicity of matrine. Re-sults of Western blotting showed that matrine induced the release of cytochrome c from mitochondria to cytoplasm, and then stimulate the cleavage of Caspase-9 in a time-dependent manner. Conclusion: Matrine induced apoptosis in Hep G2 cells through the mitochondrial pathway, and oxidative stress via depletion of GSH is directly involved in the apoptotic process.展开更多
Objective： The aim of this study was to study the effect of Ginkgo biloba extract （EGb761） on metabolism of afiatoxin B1 （AFB1） in Wistar rats. Methods： Seventy one Wistar rats were assigned at random to groups ...Objective： The aim of this study was to study the effect of Ginkgo biloba extract （EGb761） on metabolism of afiatoxin B1 （AFB1） in Wistar rats. Methods： Seventy one Wistar rats were assigned at random to groups A, B and C. Rats in groups A, B were injected with AFB1 （intraperitoneal, 100-200 ug/kg body weight, 1-3 times/week）. Group C was normal control. Rats in group B were fed in food with EGb761, while rats in groups A, C were given normal food. Blood samples were collected and liver biopsies were performed on the 14th, 28th and 42nd week. All the rats were sacrificed on the 64th week. The incidence of hepatocarcinoma was investigated. The hepatic phase I drug-metabolizing enzyme Cytochrome-P450 （CYP450） and phase II metabolizing enzyme glutathione S-transferase （GST） were analyzed with spectrometry. Serum AFB1- lysine adduct levels were assessed with high performance liquid chromatography （HPLC）. The expression of 8-hydroxydeoxy- guanosine （8-OHdG） was measured with immunohistochemistry. Results： The incidence of hepatocellular carcinoma （HCC） in group B was significantly lower than that in group A （26.92% vs 76.00%, P 〈 0.001）. No HCC developed in group C. EGb761 showed no effects on the activities of CYP450 and GST in rat liver tissues. The level of AFB1-lysine adduct reached the peak （4356.01 pg/mg albumin） at the 14th week in group A. EGb761 significantly inhibited the formation of AFB1-lysine adduct 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 （P 〈 0.05）. Conclusion： The main mechanism underlying the effect of EGb761 in blocking hepatocarcinogenesis induced by AFB1 may not be fully attributable to its influence on the activity of liver phase I and phase II metabolizing enzymes. EGb761 inhibits the production of AFB1-lysine adducts, 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 AFB1-induced hepatocarcinogenesis.展开更多
Objective:To observe the efficacy of acupoint sticking with Jianpi Tongjing Zhitong ointmerrt in the treatment of functional dyspepsia due to liver-qi stagnation and spleen deficiency and its effect on serum 5-hydroxy...Objective:To observe the efficacy of acupoint sticking with Jianpi Tongjing Zhitong ointmerrt in the treatment of functional dyspepsia due to liver-qi stagnation and spleen deficiency and its effect on serum 5-hydroxytryptamine(5-HT)and ghrelin con tents.Methods:One hun dred patients with functi onal dyspepsia due to liver-qi stag nation and spleen deficiency were divided into a treatment group and a control group by the random number table method,with 50 cases in each group.The treatment group received acupoint sticking with Jianpi Tongjing Zhitong ointment and the control group was treated with mosapride citrate orally.Patients were treated for 4 weeks as a course.The therapeutic efficacy was compared after one-course treatment and the differences in gastric emptying rate,and serum 5-HT and ghrelin contents between groups were compared before and after treatment.Results:The total effective rate was 79.6%in the control group and 89.4%in the treatment group,showing significantly differe nt between groups(P<0.05).After treatme nt,the gastric empt ying rate and serum ghreli n con tent of the two groups in creased significantly,and the serum 5-HT content decreased significantly,the intra-group differe nces were significant(all P<0.01).After treatment,the gastric emptying rate and serum ghrelin content were significantly higher in the treatment group than those in the control group,while the serum 5-HT was significant lower in the treatment group,the inter-group differences were significant(all P<0.05).A negative correlation(r=-0.59)was observed between serum 5-HT content and gastric emptying rate,and a positive correlation(r=0.64)was observed between serum ghrelin content and gastric emptying rate,showing statistical significance(all P<0.01).Conclusion:Acupoint sticking with Jianpi Tongjing Zhitong ointment has a remarkable ciinical efficacy in treating patie nts with functional dyspepsia due to liver-qi stagnation and spleen deficiency and is able to in fluence the secretion of serum 5-HT and ghrelin-1 mproving the gastrointestinal motility through the regulation of related brain-gut peptides is suggested as an underlying mechanism for this therapy.展开更多
基金the Chinese Traditional Medicine Founda-tion of Zhejiang (No. 2007CB184)
文摘Objective: To investigate the death mode of human hepatoma cells exposed to matrine and the role of glutathione (GSH) and cytochrome c. Methods: The MTT test and Cell Death Detection ELISA were used to identify cell death mode and viability of cells exposed to matrine. The volume of intracellular GSH was detected by GSH reductase. Finally Western blotting was chosen to analyze the expression of cytochrome c and Caspase-9 in HepG2 cells treated by matrine. Results: The apop-totic cell death induced by matrine in Hep G2 cells dramatically increased in the time-, dose-dependent manner. Matrine can exhaust intracellular GSH effectively to change the redox state in cells. Furthermore it affect the cytotoxicity of matrine. Re-sults of Western blotting showed that matrine induced the release of cytochrome c from mitochondria to cytoplasm, and then stimulate the cleavage of Caspase-9 in a time-dependent manner. Conclusion: Matrine induced apoptosis in Hep G2 cells through the mitochondrial pathway, and oxidative stress via depletion of GSH is directly involved in the apoptotic process.
文摘Objective： The aim of this study was to study the effect of Ginkgo biloba extract （EGb761） on metabolism of afiatoxin B1 （AFB1） in Wistar rats. Methods： Seventy one Wistar rats were assigned at random to groups A, B and C. Rats in groups A, B were injected with AFB1 （intraperitoneal, 100-200 ug/kg body weight, 1-3 times/week）. Group C was normal control. Rats in group B were fed in food with EGb761, while rats in groups A, C were given normal food. Blood samples were collected and liver biopsies were performed on the 14th, 28th and 42nd week. All the rats were sacrificed on the 64th week. The incidence of hepatocarcinoma was investigated. The hepatic phase I drug-metabolizing enzyme Cytochrome-P450 （CYP450） and phase II metabolizing enzyme glutathione S-transferase （GST） were analyzed with spectrometry. Serum AFB1- lysine adduct levels were assessed with high performance liquid chromatography （HPLC）. The expression of 8-hydroxydeoxy- guanosine （8-OHdG） was measured with immunohistochemistry. Results： The incidence of hepatocellular carcinoma （HCC） in group B was significantly lower than that in group A （26.92% vs 76.00%, P 〈 0.001）. No HCC developed in group C. EGb761 showed no effects on the activities of CYP450 and GST in rat liver tissues. The level of AFB1-lysine adduct reached the peak （4356.01 pg/mg albumin） at the 14th week in group A. EGb761 significantly inhibited the formation of AFB1-lysine adduct 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 （P 〈 0.05）. Conclusion： The main mechanism underlying the effect of EGb761 in blocking hepatocarcinogenesis induced by AFB1 may not be fully attributable to its influence on the activity of liver phase I and phase II metabolizing enzymes. EGb761 inhibits the production of AFB1-lysine adducts, 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 AFB1-induced hepatocarcinogenesis.
文摘Objective:To observe the efficacy of acupoint sticking with Jianpi Tongjing Zhitong ointmerrt in the treatment of functional dyspepsia due to liver-qi stagnation and spleen deficiency and its effect on serum 5-hydroxytryptamine(5-HT)and ghrelin con tents.Methods:One hun dred patients with functi onal dyspepsia due to liver-qi stag nation and spleen deficiency were divided into a treatment group and a control group by the random number table method,with 50 cases in each group.The treatment group received acupoint sticking with Jianpi Tongjing Zhitong ointment and the control group was treated with mosapride citrate orally.Patients were treated for 4 weeks as a course.The therapeutic efficacy was compared after one-course treatment and the differences in gastric emptying rate,and serum 5-HT and ghrelin contents between groups were compared before and after treatment.Results:The total effective rate was 79.6%in the control group and 89.4%in the treatment group,showing significantly differe nt between groups(P<0.05).After treatme nt,the gastric empt ying rate and serum ghreli n con tent of the two groups in creased significantly,and the serum 5-HT content decreased significantly,the intra-group differe nces were significant(all P<0.01).After treatment,the gastric emptying rate and serum ghrelin content were significantly higher in the treatment group than those in the control group,while the serum 5-HT was significant lower in the treatment group,the inter-group differences were significant(all P<0.05).A negative correlation(r=-0.59)was observed between serum 5-HT content and gastric emptying rate,and a positive correlation(r=0.64)was observed between serum ghrelin content and gastric emptying rate,showing statistical significance(all P<0.01).Conclusion:Acupoint sticking with Jianpi Tongjing Zhitong ointment has a remarkable ciinical efficacy in treating patie nts with functional dyspepsia due to liver-qi stagnation and spleen deficiency and is able to in fluence the secretion of serum 5-HT and ghrelin-1 mproving the gastrointestinal motility through the regulation of related brain-gut peptides is suggested as an underlying mechanism for this therapy.
