对大黄游离蒽醌的超临界萃取工艺进行了优化,确定最优萃取工艺条件为:静萃取时间60 m in,动萃取时间30 m in,夹带剂乙醇相对大黄用量3 mL/g,萃取温度45℃,萃取压力45 MPa。然后分别采用无机酸和生物酶对大黄结合蒽醌进行水解,以提取总...对大黄游离蒽醌的超临界萃取工艺进行了优化,确定最优萃取工艺条件为:静萃取时间60 m in,动萃取时间30 m in,夹带剂乙醇相对大黄用量3 mL/g,萃取温度45℃,萃取压力45 MPa。然后分别采用无机酸和生物酶对大黄结合蒽醌进行水解,以提取总蒽醌。结果表明:当盐酸浓度为5 mol/L,淀粉酶质量浓度为2 g/L,纤维素酶质量浓度为1 g/L时,大黄结合蒽醌的糖苷键达到最优水解,此时总蒽醌质量分数分别为2.46%、2.33%和2.23%。展开更多
AIM:rAAV mediated endostatin gene therapy has been examined as a new method for treating cancer.However, a sustained and high protein delivery is required to achieve the desired therapeutic effects.We evaluated the im...AIM:rAAV mediated endostatin gene therapy has been examined as a new method for treating cancer.However, a sustained and high protein delivery is required to achieve the desired therapeutic effects.We evaluated the impact of topoisomerase inhibitors in rAAV delivered endostatin gene therapy in a liver tumor model. METHODS:rAAV containing endostatin expression cassettes were transduced into hepatoma cell lines.To test whether the topoisomerase inhibitor pretreatment increased the expression of endostatin,Western blotting and ELISA were performed.The biologic activity of endostatin was confirmed by endothelial cell proliferation and tube formation assays. The anti-tumor effects of the rAAV-endostatin vector combined with a topoisomerase inhibitor,etoposide,were evaluated in a mouse liver tumor model. RESULTS:Topoisomerase inhibitors,including camptothecin and etoposide,were found to increase the endostatin exPression level in vitro.The over-expressed endostatin, as a result of pretreatment with a topoisomerase inhibitor, was also biologically active.In animal experiments,the combined therapy of topoisomerase inhibitor,etoposide with the rAAV-endostatin vector had the best tumor- suppressive effect and tumor foci were barely observed in livers of the treated mice.Pretreatment with an etoposide increased the level of endostatin in the liver and serum of rAAV-endostatin treated mice.Finally,the mice treated With rAAV-endostatin in combination with etoposide showed the longest survival among the experimental models. CONCLUSION:rAAV delivered endostatin gene therapy in combination with a topoisomerase inhibitor pretreatment is an effective modality for anticancer gene therapy.展开更多
Arbuscular mycorrhizal fungi(AMF)provide essential nutrients to crops and are affected by fertilizers.Phosphate-solubilizing bacteria(PSB),nitrogen-fixing bacteria(NFB),and AMF have mutually beneficial relationships w...Arbuscular mycorrhizal fungi(AMF)provide essential nutrients to crops and are affected by fertilizers.Phosphate-solubilizing bacteria(PSB),nitrogen-fixing bacteria(NFB),and AMF have mutually beneficial relationships with plants,but the effects of their interactions on plant growth by regulating rhizosphere fungal community have not been sufficiently studied.In this study,a greenhouse pot experiment was conducted to investigate the interactions between AMF and bacteria(PSB and NFB)on the growth of Lotus corniculatus L.Specifically,the role of rhizosphere fungal community in the growth of Lotus corniculatus L.was explored using Illumina MiSeq high-throughput sequencing.The results showed that combined inoculation of AMF with PSB and NFB increased plant biomass,plant height,and fungal colonization rate.The richness,complexity,and stability of rhizosphere fungal community also increased after combined inoculation of AMF with PSB and/or NFB,particularly with PSB.In addition,combined inoculation of AMF with PSB and NFB enriched the abundance of beneficial microorganisms,with Chaetomium and Humicola showing the greatest alterations.The structural equation model showed that the interactions of AMF with PSB and NFB promoted plant growth by affecting fungal network structure and soil enzyme activities involved in carbon,nitrogen,and phosphorus cycling.These findings provide evidence for the effects of interactions of AMF with PSB and NFB on rhizosphere fungal community and plant growth.展开更多
文摘对大黄游离蒽醌的超临界萃取工艺进行了优化,确定最优萃取工艺条件为:静萃取时间60 m in,动萃取时间30 m in,夹带剂乙醇相对大黄用量3 mL/g,萃取温度45℃,萃取压力45 MPa。然后分别采用无机酸和生物酶对大黄结合蒽醌进行水解,以提取总蒽醌。结果表明:当盐酸浓度为5 mol/L,淀粉酶质量浓度为2 g/L,纤维素酶质量浓度为1 g/L时,大黄结合蒽醌的糖苷键达到最优水解,此时总蒽醌质量分数分别为2.46%、2.33%和2.23%。
基金Supported by a faculty research grant of Yonsei University College of Medicine for 2002,No.2002-06
文摘AIM:rAAV mediated endostatin gene therapy has been examined as a new method for treating cancer.However, a sustained and high protein delivery is required to achieve the desired therapeutic effects.We evaluated the impact of topoisomerase inhibitors in rAAV delivered endostatin gene therapy in a liver tumor model. METHODS:rAAV containing endostatin expression cassettes were transduced into hepatoma cell lines.To test whether the topoisomerase inhibitor pretreatment increased the expression of endostatin,Western blotting and ELISA were performed.The biologic activity of endostatin was confirmed by endothelial cell proliferation and tube formation assays. The anti-tumor effects of the rAAV-endostatin vector combined with a topoisomerase inhibitor,etoposide,were evaluated in a mouse liver tumor model. RESULTS:Topoisomerase inhibitors,including camptothecin and etoposide,were found to increase the endostatin exPression level in vitro.The over-expressed endostatin, as a result of pretreatment with a topoisomerase inhibitor, was also biologically active.In animal experiments,the combined therapy of topoisomerase inhibitor,etoposide with the rAAV-endostatin vector had the best tumor- suppressive effect and tumor foci were barely observed in livers of the treated mice.Pretreatment with an etoposide increased the level of endostatin in the liver and serum of rAAV-endostatin treated mice.Finally,the mice treated With rAAV-endostatin in combination with etoposide showed the longest survival among the experimental models. CONCLUSION:rAAV delivered endostatin gene therapy in combination with a topoisomerase inhibitor pretreatment is an effective modality for anticancer gene therapy.
基金supported by the Key Research and Development Program of Anhui Province,China(No.202204c06020021)the National Natural Science Foundation of China(Nos.U21A20235 and 32201308)。
文摘Arbuscular mycorrhizal fungi(AMF)provide essential nutrients to crops and are affected by fertilizers.Phosphate-solubilizing bacteria(PSB),nitrogen-fixing bacteria(NFB),and AMF have mutually beneficial relationships with plants,but the effects of their interactions on plant growth by regulating rhizosphere fungal community have not been sufficiently studied.In this study,a greenhouse pot experiment was conducted to investigate the interactions between AMF and bacteria(PSB and NFB)on the growth of Lotus corniculatus L.Specifically,the role of rhizosphere fungal community in the growth of Lotus corniculatus L.was explored using Illumina MiSeq high-throughput sequencing.The results showed that combined inoculation of AMF with PSB and NFB increased plant biomass,plant height,and fungal colonization rate.The richness,complexity,and stability of rhizosphere fungal community also increased after combined inoculation of AMF with PSB and/or NFB,particularly with PSB.In addition,combined inoculation of AMF with PSB and NFB enriched the abundance of beneficial microorganisms,with Chaetomium and Humicola showing the greatest alterations.The structural equation model showed that the interactions of AMF with PSB and NFB promoted plant growth by affecting fungal network structure and soil enzyme activities involved in carbon,nitrogen,and phosphorus cycling.These findings provide evidence for the effects of interactions of AMF with PSB and NFB on rhizosphere fungal community and plant growth.
