Objective:To study the transmembrane transport of chemical components of Chinese herbs and to explore the function of platycodin D (PD) on biomembranes.Methods:Interaction between PD and the dipalmitoylphosphatidylcho...Objective:To study the transmembrane transport of chemical components of Chinese herbs and to explore the function of platycodin D (PD) on biomembranes.Methods:Interaction between PD and the dipalmitoylphosphatidylcholine (DPPC) bilayer was reproduced by molecular dynamics simulation with the Martini force field.A model validation and methodological study were first performed,and were based on simulation investigations of transmembrane transport for three herbal compounds with distinct hydrophilic properties.Results:PD increased the mobility of the DPPC bilayer since its aglycone strongly interacted with the hydrophobic layer,which broke the structure of the gate layer,and weakened the ordered performance of hydrophobic tails.Conclusion:The Martini force field was successfully applied to the study of the interaction between herbal compounds and a biological membrane.By combining the dynamics equilibrium morphology,the distribution of drugs inside and outside the biomembrane,and the interaction sites of drugs on the DPPC bilayer,factors influencing transmembrane transport of drugs were elucidated and the function of platycodin D in a biological membrane was reproduced.展开更多
Platycodin D(PD), a triterpenoid saponin isolated from Platycodonis Radix, is a famous Chinese herbal medicine that has been shown to have anti-proliferative effects in several cancer cell lines. The aim of this study...Platycodin D(PD), a triterpenoid saponin isolated from Platycodonis Radix, is a famous Chinese herbal medicine that has been shown to have anti-proliferative effects in several cancer cell lines. The aim of this study was to determine the changes in cellular proteins after the treatment of hepatocellular carcinoma HepG2 cells with PD using proteomics approaches. The cell viability was determined using the MTT assay. The proteome was analyzed by two-dimensional difference gel electrophoresis and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Western blot analysis was used to confirm the expression of changed proteins. Our results showed that PD inhibited the proliferation of HepG2 cells in concentration- and time-dependent manners. Sixteen proteins were identified to be up-regulated in PD-treated HepG2 cells, including ATP5 H, OXCT1, KRT9, CCDC40, ERP29, RCN1, ZNF175, HNRNPH1, HSP27, PA2G4, PHB, BANF1, TPM3, ECH1, LGALS1, and MYL6. Three proteins(i.e., RPS12, EMG1, and KRT1) decreased in HepG2 cells after treatment with PD. The changes in HSP27 and PHB were further confirmed by Western blotting. In conclusion, our results shed new lights on the mechanisms of action for the anti-cancer activity of PD.展开更多
In this study,a dissipative particle dynamics mehtod was used to study the solubilization enhancing effect of platycodin towards 5 different drug components.Two factors were mainly considered,including the ,XlogP valu...In this study,a dissipative particle dynamics mehtod was used to study the solubilization enhancing effect of platycodin towards 5 different drug components.Two factors were mainly considered,including the ,XlogP value of drug components and the sugar chain length of platycodin.As a result,it was found that there was an optimal drug XlogP value for the solubilization enhancing effect of platycodin,and it was different between the drug's own XlogP value and the optimal drug XlogP value of platycodin that determines the solubilization enhancing effect.展开更多
目的:建立测定桔梗样品中桔梗皂苷 E 含量的方法。方法:采用 HPLC-ELSD 法,C_(18)柱(3.9mm×300mm,4μm),以乙腈-水为流动相梯度洗脱,流速1.0mL·min^(-1),ELSD 漂移管温度112℃,载气(N_2)流速3.2L·min^(-1)。结果:不同产...目的:建立测定桔梗样品中桔梗皂苷 E 含量的方法。方法:采用 HPLC-ELSD 法,C_(18)柱(3.9mm×300mm,4μm),以乙腈-水为流动相梯度洗脱,流速1.0mL·min^(-1),ELSD 漂移管温度112℃,载气(N_2)流速3.2L·min^(-1)。结果:不同产地的桔梗中均含有桔梗皂苷 E,但含量差别较大,其中以安徽青阳产含量最高(0.26%)。结论:本方法稳定、可靠,桔梗皂苷 E 可作为评价桔梗质量的指标之一。展开更多
基金The experiment was financially supported by the National Natural Science Foundation of China(81473364)Beijing Natural Science Foundation(7162122)Excellent Talents Training Subsidy Scheme of Beijing(2013D009999000003).
文摘Objective:To study the transmembrane transport of chemical components of Chinese herbs and to explore the function of platycodin D (PD) on biomembranes.Methods:Interaction between PD and the dipalmitoylphosphatidylcholine (DPPC) bilayer was reproduced by molecular dynamics simulation with the Martini force field.A model validation and methodological study were first performed,and were based on simulation investigations of transmembrane transport for three herbal compounds with distinct hydrophilic properties.Results:PD increased the mobility of the DPPC bilayer since its aglycone strongly interacted with the hydrophobic layer,which broke the structure of the gate layer,and weakened the ordered performance of hydrophobic tails.Conclusion:The Martini force field was successfully applied to the study of the interaction between herbal compounds and a biological membrane.By combining the dynamics equilibrium morphology,the distribution of drugs inside and outside the biomembrane,and the interaction sites of drugs on the DPPC bilayer,factors influencing transmembrane transport of drugs were elucidated and the function of platycodin D in a biological membrane was reproduced.
基金supported by the Science and Technology Development Fund,Macao S.A.R(FDCT)(070/2013/A)the Research Fund of University of Macao(SRG026-ICMS13-LJJ and MRG008-LJJ2014-ICMS)+1 种基金the Administration of Traditional Chinese Medicine of Zhejiang Province(No.2012 ZA028)Program of Xinmiao Talents in Zhejiang Province(No.2010 R410024)
文摘Platycodin D(PD), a triterpenoid saponin isolated from Platycodonis Radix, is a famous Chinese herbal medicine that has been shown to have anti-proliferative effects in several cancer cell lines. The aim of this study was to determine the changes in cellular proteins after the treatment of hepatocellular carcinoma HepG2 cells with PD using proteomics approaches. The cell viability was determined using the MTT assay. The proteome was analyzed by two-dimensional difference gel electrophoresis and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Western blot analysis was used to confirm the expression of changed proteins. Our results showed that PD inhibited the proliferation of HepG2 cells in concentration- and time-dependent manners. Sixteen proteins were identified to be up-regulated in PD-treated HepG2 cells, including ATP5 H, OXCT1, KRT9, CCDC40, ERP29, RCN1, ZNF175, HNRNPH1, HSP27, PA2G4, PHB, BANF1, TPM3, ECH1, LGALS1, and MYL6. Three proteins(i.e., RPS12, EMG1, and KRT1) decreased in HepG2 cells after treatment with PD. The changes in HSP27 and PHB were further confirmed by Western blotting. In conclusion, our results shed new lights on the mechanisms of action for the anti-cancer activity of PD.
基金the Natural Science Foundation of Beijing,China(No.7162122).
文摘In this study,a dissipative particle dynamics mehtod was used to study the solubilization enhancing effect of platycodin towards 5 different drug components.Two factors were mainly considered,including the ,XlogP value of drug components and the sugar chain length of platycodin.As a result,it was found that there was an optimal drug XlogP value for the solubilization enhancing effect of platycodin,and it was different between the drug's own XlogP value and the optimal drug XlogP value of platycodin that determines the solubilization enhancing effect.
文摘目的:建立测定桔梗样品中桔梗皂苷 E 含量的方法。方法:采用 HPLC-ELSD 法,C_(18)柱(3.9mm×300mm,4μm),以乙腈-水为流动相梯度洗脱,流速1.0mL·min^(-1),ELSD 漂移管温度112℃,载气(N_2)流速3.2L·min^(-1)。结果:不同产地的桔梗中均含有桔梗皂苷 E,但含量差别较大,其中以安徽青阳产含量最高(0.26%)。结论:本方法稳定、可靠,桔梗皂苷 E 可作为评价桔梗质量的指标之一。
