Recombinant human granulocyte colony-stimulating factor （rhG-CSF） in inclusion bodies was solubilized by 8 mol/L urea solution and subsequently precipitated by acetone to improve its purity. After that, the precipit...Recombinant human granulocyte colony-stimulating factor （rhG-CSF） in inclusion bodies was solubilized by 8 mol/L urea solution and subsequently precipitated by acetone to improve its purity. After that, the precipitates were solubilized by sodium hydroxide solution containing 2 mol/L urea. Then the solubilized rhG-CSF was passed through a size exclusion chromatography for refolding and extensive purification, and further purified by a weak anion exchange chromatography. The purity and mass recovery of refolded rhG-CSF were 96.5% and 75.6%, respectively. The bioactivity was 8.4x10^7 IU/mg.展开更多
The urea denatured recombinant human granulocyte colony-stimulating factor (rhG- CSF) which was expressed in Escheriachia coli (E. coli) was refolded with simultaneous purification by strong anion exchange chromatogra...The urea denatured recombinant human granulocyte colony-stimulating factor (rhG- CSF) which was expressed in Escheriachia coli (E. coli) was refolded with simultaneous purification by strong anion exchange chromatography (SAX) in the presence of low concentration- of urea. The effect of urea concentration on this refolding process was investigated. The obtained refolded rhG-CSF has a high specific activity of 2.3×108 U/mg, demonstrating that the proteins were completely refolded during the chromatographic process. With only one step by SAX in 40 min, purity and mass recovery of the refolded and purified rhG-CSF were 97% and 43%, respectively.展开更多
Thymidylate synthase （TS, E.C.2.1.1.45） catalyzes a critical reaction in the only pathway of de novo synthesis of thymidylate （dTMP） in human cells, and is an important target of chemotherapy. To evaluate the inhi...Thymidylate synthase （TS, E.C.2.1.1.45） catalyzes a critical reaction in the only pathway of de novo synthesis of thymidylate （dTMP） in human cells, and is an important target of chemotherapy. To evaluate the inhibitory activities of novel compounds to TS, a convenient method of activity assay using 6x His-tagged recombinant human TS （rhTS） was established and 49 novel synthetic folate analogues were screened to discover potential TS inhibitors. During the process, 4 novel compounds were found to effectively inhibit TS, while the IC 50 of a positive control raltitrexed was 3.4 μM in this assay.展开更多
目的探讨粉尘螨Ⅲ类重组变应原(Der f 3)诱导的小鼠哮喘模型的致敏效果。方法 30只6～8周龄雌性SPF级BALB/c小鼠随机分为PBS组(阴性对照组)、卵清蛋白(OVA)组(阳性对照组)和Der f 3组(实验组),OVA组和Der f 3组分别使用OVA和纯化Der f ...目的探讨粉尘螨Ⅲ类重组变应原(Der f 3)诱导的小鼠哮喘模型的致敏效果。方法 30只6～8周龄雌性SPF级BALB/c小鼠随机分为PBS组(阴性对照组)、卵清蛋白(OVA)组(阳性对照组)和Der f 3组(实验组),OVA组和Der f 3组分别使用OVA和纯化Der f 3蛋白于第0、7、14d进行腹腔注射致敏,于第21d开始雾化吸入,连续7d,PBS组则换成PBS进行腹腔注射和雾化吸入。最后一次雾化吸入24h后,分别观察肺组织病理变化、支气管肺泡灌洗液(BLAF)中的白细胞计数,酶联免疫吸附试验(ELISA)测定BLAF和脾细胞培养上清中IL-4、IL-2、IL-17和IFN-γ的含量及血清中IgG1、IgE抗体水平变化。结果 OVA组和Der f 3组小鼠肺部支气管、血管粘膜下及周围肺组织有明显的炎性细胞浸润、支气管上皮细胞部分断裂及脱落,血管壁明显水肿等,而PBS组未见明显病理改变;Der f 3组的BALF中白细胞总数[(19.99±1.03)×106个/mL]及嗜酸性粒细胞(EOS)[(1.81±0.07)×106个/mL]计数均明显高于PBS组(P<0.01);与PBS组相比:BALF中IL-4[(80.99±9.06)pg/mL]、IL-17[(209.69±31.86)pg/mL]呈高水平表达(P<0.01),而IL-2[(8.29±1.27)pg/mL]和IFN-γ[(55.04±18.85)pg/mL]含量则显著下降(P<0.01);上述指标在脾细胞培养上清中出现类似的变化。Der f 3组血清中IgE[(31.92±2.68)U/mL]、IgG1[(16.46±4.32)μg/mL]的含量表现为Th2型反应增强趋势;但OVA组和Der f 3组间所有指标差异均无统计学意义(P>0.05)。结论粉尘螨重组Der f 3蛋白可成功建立小鼠变态反应性气道及肺部炎症动物模型。展开更多
基金This work is supported by the National Natural Science Foundation of china （No. 20175016 and No. 20475042） the Foundation of Key Laboratory of Modem Separation Science in Shaanxi Province （No. 05JS61）.
文摘Recombinant human granulocyte colony-stimulating factor （rhG-CSF） in inclusion bodies was solubilized by 8 mol/L urea solution and subsequently precipitated by acetone to improve its purity. After that, the precipitates were solubilized by sodium hydroxide solution containing 2 mol/L urea. Then the solubilized rhG-CSF was passed through a size exclusion chromatography for refolding and extensive purification, and further purified by a weak anion exchange chromatography. The purity and mass recovery of refolded rhG-CSF were 96.5% and 75.6%, respectively. The bioactivity was 8.4x10^7 IU/mg.
基金This work is supported by the National Natural Science Foundation of China(No．20175016)
文摘The urea denatured recombinant human granulocyte colony-stimulating factor (rhG- CSF) which was expressed in Escheriachia coli (E. coli) was refolded with simultaneous purification by strong anion exchange chromatography (SAX) in the presence of low concentration- of urea. The effect of urea concentration on this refolding process was investigated. The obtained refolded rhG-CSF has a high specific activity of 2.3×108 U/mg, demonstrating that the proteins were completely refolded during the chromatographic process. With only one step by SAX in 40 min, purity and mass recovery of the refolded and purified rhG-CSF were 97% and 43%, respectively.
基金supported by National Natural Science Foundation of China(Grant No.20972011,21042009,21172014)
文摘Thymidylate synthase （TS, E.C.2.1.1.45） catalyzes a critical reaction in the only pathway of de novo synthesis of thymidylate （dTMP） in human cells, and is an important target of chemotherapy. To evaluate the inhibitory activities of novel compounds to TS, a convenient method of activity assay using 6x His-tagged recombinant human TS （rhTS） was established and 49 novel synthetic folate analogues were screened to discover potential TS inhibitors. During the process, 4 novel compounds were found to effectively inhibit TS, while the IC 50 of a positive control raltitrexed was 3.4 μM in this assay.
文摘目的探讨粉尘螨Ⅲ类重组变应原(Der f 3)诱导的小鼠哮喘模型的致敏效果。方法 30只6～8周龄雌性SPF级BALB/c小鼠随机分为PBS组(阴性对照组)、卵清蛋白(OVA)组(阳性对照组)和Der f 3组(实验组),OVA组和Der f 3组分别使用OVA和纯化Der f 3蛋白于第0、7、14d进行腹腔注射致敏,于第21d开始雾化吸入,连续7d,PBS组则换成PBS进行腹腔注射和雾化吸入。最后一次雾化吸入24h后,分别观察肺组织病理变化、支气管肺泡灌洗液(BLAF)中的白细胞计数,酶联免疫吸附试验(ELISA)测定BLAF和脾细胞培养上清中IL-4、IL-2、IL-17和IFN-γ的含量及血清中IgG1、IgE抗体水平变化。结果 OVA组和Der f 3组小鼠肺部支气管、血管粘膜下及周围肺组织有明显的炎性细胞浸润、支气管上皮细胞部分断裂及脱落,血管壁明显水肿等,而PBS组未见明显病理改变;Der f 3组的BALF中白细胞总数[(19.99±1.03)×106个/mL]及嗜酸性粒细胞(EOS)[(1.81±0.07)×106个/mL]计数均明显高于PBS组(P<0.01);与PBS组相比:BALF中IL-4[(80.99±9.06)pg/mL]、IL-17[(209.69±31.86)pg/mL]呈高水平表达(P<0.01),而IL-2[(8.29±1.27)pg/mL]和IFN-γ[(55.04±18.85)pg/mL]含量则显著下降(P<0.01);上述指标在脾细胞培养上清中出现类似的变化。Der f 3组血清中IgE[(31.92±2.68)U/mL]、IgG1[(16.46±4.32)μg/mL]的含量表现为Th2型反应增强趋势;但OVA组和Der f 3组间所有指标差异均无统计学意义(P>0.05)。结论粉尘螨重组Der f 3蛋白可成功建立小鼠变态反应性气道及肺部炎症动物模型。
