目的建立多组分定量联合化学计量学及熵权TOPSIS分析对不同产地所得青钱柳Cyclocarya paliurus质量进行评价的方法,为青钱柳药材的品质评价和质量控制提供参考。方法取不同产地所得18批青钱柳为检测样品,以熊果酸为内参物,采用一测多评(...目的建立多组分定量联合化学计量学及熵权TOPSIS分析对不同产地所得青钱柳Cyclocarya paliurus质量进行评价的方法,为青钱柳药材的品质评价和质量控制提供参考。方法取不同产地所得18批青钱柳为检测样品,以熊果酸为内参物,采用一测多评(quantitative analysis of multi-components by single-marker,QAMS)法同时测定青钱柳中14个成分的含量,运用化学计量学和熵权TOPSIS分析法对不同产地青钱柳进行比较分析和综合评价。结果含量测定方法学考察结果符合中国药典规定要求。以熊果酸为内参物的相对校正因子稳定性、耐用性良好(RSD均小于2.0%),外标法实测值与QAMS法计算结果没有显著差异。化学计量学方法显示18批青钱柳可聚为3类,呈现一定的区域差异;槲皮素-3-O-葡萄糖醛酸苷、金丝桃苷、熊果酸、阿福豆苷和异槲皮苷是影响青钱柳产品质量的主要成分;EW-TOPSIS法分析结果显示贵州和四川地区所得青钱柳质量最优,其次为湖南、江西和安徽。结论所建方法快速灵敏、准确可靠,可用于青钱柳内在质量的综合质量评价。展开更多
AIM: To investigate the molecular signaling mechanism by which the plant-derived, pentacyclic triterpene maslinic acid(MA) exerts anti-diabetic effects. METHOD: HepG2 cells were stimulated with various concentrations ...AIM: To investigate the molecular signaling mechanism by which the plant-derived, pentacyclic triterpene maslinic acid(MA) exerts anti-diabetic effects. METHOD: HepG2 cells were stimulated with various concentrations of MA. The effects of MA on glycogen phosphorylase a(GPa) activity and the cellular glycogen content were measured. Western blot analyses were performed with anti-insulin receptor β(IRβ), protein kinase B(also known as Akt), and glycogen synthase kinase-3β(GSK3β) antibodies. Activation status of the insulin pathway was investigated using phospho-IRβ, as well as phospho-Akt, and phospho-GSK3β antibodies. The specific PI3-kinase inhibitor wortmannin was added to the cells to analyze the Akt expression. Enzyme-linked immunosorbent assay(ELISA) was used to measure the effect of MA on IRβ auto-phosphorylation. Furthermore, the effect of MA on glycogen metabolism was investigated in C57BL/6J mice fed with a high-fat diet(HFD). RESULTS: The results showed that MA exerts anti-diabetic effects by increasing glycogen content and inhibiting glycogen phosphorylase activity in HepG2 cells. Furthermore, MA was shown to induce the phosphorylation level of IRβ-subunit, Akt, and GSK3β. The MA-induced activation of Akt appeared to be specific, since it could be blocked by wortmannin. Finally, MA treatment of mice fed with a high-fat diet reduced the model-associated adiposity and insulin resistance, and increased the accumulated hepatic glycogen content. CONCLUSION: The results suggested that maslinic acid modulates glycogen metabolism by enhancing the insulin signaling pathway and inhibiting glycogen phosphorylase.展开更多
文摘目的建立多组分定量联合化学计量学及熵权TOPSIS分析对不同产地所得青钱柳Cyclocarya paliurus质量进行评价的方法,为青钱柳药材的品质评价和质量控制提供参考。方法取不同产地所得18批青钱柳为检测样品,以熊果酸为内参物,采用一测多评(quantitative analysis of multi-components by single-marker,QAMS)法同时测定青钱柳中14个成分的含量,运用化学计量学和熵权TOPSIS分析法对不同产地青钱柳进行比较分析和综合评价。结果含量测定方法学考察结果符合中国药典规定要求。以熊果酸为内参物的相对校正因子稳定性、耐用性良好(RSD均小于2.0%),外标法实测值与QAMS法计算结果没有显著差异。化学计量学方法显示18批青钱柳可聚为3类,呈现一定的区域差异;槲皮素-3-O-葡萄糖醛酸苷、金丝桃苷、熊果酸、阿福豆苷和异槲皮苷是影响青钱柳产品质量的主要成分;EW-TOPSIS法分析结果显示贵州和四川地区所得青钱柳质量最优,其次为湖南、江西和安徽。结论所建方法快速灵敏、准确可靠,可用于青钱柳内在质量的综合质量评价。
基金supported by the FundamentalResearch Funds for the Central Universities(No.JKP2011004)
文摘AIM: To investigate the molecular signaling mechanism by which the plant-derived, pentacyclic triterpene maslinic acid(MA) exerts anti-diabetic effects. METHOD: HepG2 cells were stimulated with various concentrations of MA. The effects of MA on glycogen phosphorylase a(GPa) activity and the cellular glycogen content were measured. Western blot analyses were performed with anti-insulin receptor β(IRβ), protein kinase B(also known as Akt), and glycogen synthase kinase-3β(GSK3β) antibodies. Activation status of the insulin pathway was investigated using phospho-IRβ, as well as phospho-Akt, and phospho-GSK3β antibodies. The specific PI3-kinase inhibitor wortmannin was added to the cells to analyze the Akt expression. Enzyme-linked immunosorbent assay(ELISA) was used to measure the effect of MA on IRβ auto-phosphorylation. Furthermore, the effect of MA on glycogen metabolism was investigated in C57BL/6J mice fed with a high-fat diet(HFD). RESULTS: The results showed that MA exerts anti-diabetic effects by increasing glycogen content and inhibiting glycogen phosphorylase activity in HepG2 cells. Furthermore, MA was shown to induce the phosphorylation level of IRβ-subunit, Akt, and GSK3β. The MA-induced activation of Akt appeared to be specific, since it could be blocked by wortmannin. Finally, MA treatment of mice fed with a high-fat diet reduced the model-associated adiposity and insulin resistance, and increased the accumulated hepatic glycogen content. CONCLUSION: The results suggested that maslinic acid modulates glycogen metabolism by enhancing the insulin signaling pathway and inhibiting glycogen phosphorylase.
