目的:建立稳定表达EGFR-GFP融合蛋白的细胞系。方法:CaC l2法将pEGFR-EGFP质粒转化DH5α,酶切鉴定后提取质粒经电穿孔转染CHO-K1细胞;以EGFP作为荧光报告分子,克隆化培养以获取单克隆阳性细胞;流式细胞术、荧光显微镜术、W estern B lo...目的:建立稳定表达EGFR-GFP融合蛋白的细胞系。方法:CaC l2法将pEGFR-EGFP质粒转化DH5α,酶切鉴定后提取质粒经电穿孔转染CHO-K1细胞;以EGFP作为荧光报告分子,克隆化培养以获取单克隆阳性细胞;流式细胞术、荧光显微镜术、W estern B lot检测转染细胞EGFR-GFP融合蛋白的表达;比较稳定转染细胞及未转染细胞的生长曲线;反复冻存、复苏、传代鉴定细胞表达EGFR-GFP融合蛋白的稳定性。结果:获得1株稳定表达EGFR-GFP融合蛋白的细胞系,命名为CHO-EGFR-GFP1,融合蛋白主要表达于细胞膜。稳定转染细胞和未转染细胞生长特性无显著差异。结论:成功获得膜表面稳定表达EGFR-GFP融合蛋白的细胞系,为研制以EGFR为靶点的抗肿瘤药物以及研究EGFR与其配体间相互作用奠定了基础。展开更多
用MSI公司开发的计算机辅助分子设计系统模建肝癌细胞表面抗原特异性单链抗体三维结构。先分别模建VH(variable region of the heave chain)和VL(variable region of the light chain)两个结构域,然后搭建出scFv(single chain variable ...用MSI公司开发的计算机辅助分子设计系统模建肝癌细胞表面抗原特异性单链抗体三维结构。先分别模建VH(variable region of the heave chain)和VL(variable region of the light chain)两个结构域,然后搭建出scFv(single chain variable fragment)片段的整体三维结构,并对模建的结构进行分子力学和动力学优化;对结构的合理性验证显示模建结构是合理的。文章可为预测该特异性单链抗体的生物活性以及研制高亲和力、高特异性的双价抗体提供结构信息。展开更多
The effects of survivin antisense RNA on proliferation of leukemia cell line HL-60 and taxol-induced chemotherapy was explored. A cDNA fragment of survivin obtained by RT-PCR was inserted into a plamid vector named pc...The effects of survivin antisense RNA on proliferation of leukemia cell line HL-60 and taxol-induced chemotherapy was explored. A cDNA fragment of survivin obtained by RT-PCR was inserted into a plamid vector named pcDNA3 in the reverse direction. The vector encoding antisense RNA of survivin was confirmed by restriction enzyme digestion and DNA sequencing. The recombinant plasmid was delivered into HL-60 cells by electroporation. Growth curves were plotted based on cell counting. Trypan blue dye exclusion assay and MTT assay were carried out after the cells were incubated with taxol. DNA gel electrophoresis and nuclear staining were performed for cell apoptosis assay. The correct construction of the recombinant plasmid has been identified by restriction enzyme digestion and DNA sequencing. A stable down-regulation has been achieved in HL-60 SVVas cells after G418 selection. Compared to HL-60 cells, the proliferation of HL-60 SVVas cells was significantly inhibited （P〈0.05）. Cytotoxicity assays indicated that IC50 of HL-60 SVVas for taxol was relatively lower than controls （P〈0.01）. Apoptosis assays revealed that taxol-induced apoptosis was detected in HL-60 SVVas cells incubated with 50 ng/ml taxol for 12 h, while in HL-60 cells incubated with 100 ng/ml taxol for 72 h. It was suggested that Survivin antisense RNA could inhibit the proliferation of HL-60 cells and enhance taxol-induced apoptosis in HL-60 cells, which may lay an experimental foundation for further research on gene therapy in leukemia.展开更多
由于仪器传递函数(Instrument Transfer Function,ITF)能准确反映仪器在空间频率上的响应特征,被广泛应用于仪器规范之中。目前多采用刻有单一台阶特征或不同周期正弦特征的平面测试板对干涉仪的ITF进行检测。针对平面测试板无法完成高...由于仪器传递函数(Instrument Transfer Function,ITF)能准确反映仪器在空间频率上的响应特征,被广泛应用于仪器规范之中。目前多采用刻有单一台阶特征或不同周期正弦特征的平面测试板对干涉仪的ITF进行检测。针对平面测试板无法完成高陡度球面/非球面镜检测时ITF标定的问题,提出了根据球面台阶测试板标定高陡度镜面检测的子孔径拼接ITF的方法。通过超精密车削技术制作了球面台阶测试板,并对其进行拼接检测,根据梯度定位法和旋转矩阵完成检测孔径中台阶的定位及采样,利用傅里叶变换方法实现对台阶实测面形的功率谱密度求解,最后与理想面形功率谱密度做比获得ITF。对口径100 mm、曲率半径100 mm、带有同心圆环台阶结构的球面台阶测试板进行拼接检测以及数据分析,实验结果表明:在1 mm-1的空间频率范围内,各个子孔径对高陡度镜面的检测水平平均可达到82.72%,具有较好的检测精度,随后ITF逐渐衰减,当空间频率在1.5 mm^(-1)左右时,仅能达到40%~60%。展开更多
文摘目的:建立稳定表达EGFR-GFP融合蛋白的细胞系。方法:CaC l2法将pEGFR-EGFP质粒转化DH5α,酶切鉴定后提取质粒经电穿孔转染CHO-K1细胞;以EGFP作为荧光报告分子,克隆化培养以获取单克隆阳性细胞;流式细胞术、荧光显微镜术、W estern B lot检测转染细胞EGFR-GFP融合蛋白的表达;比较稳定转染细胞及未转染细胞的生长曲线;反复冻存、复苏、传代鉴定细胞表达EGFR-GFP融合蛋白的稳定性。结果:获得1株稳定表达EGFR-GFP融合蛋白的细胞系,命名为CHO-EGFR-GFP1,融合蛋白主要表达于细胞膜。稳定转染细胞和未转染细胞生长特性无显著差异。结论:成功获得膜表面稳定表达EGFR-GFP融合蛋白的细胞系,为研制以EGFR为靶点的抗肿瘤药物以及研究EGFR与其配体间相互作用奠定了基础。
文摘用MSI公司开发的计算机辅助分子设计系统模建肝癌细胞表面抗原特异性单链抗体三维结构。先分别模建VH(variable region of the heave chain)和VL(variable region of the light chain)两个结构域,然后搭建出scFv(single chain variable fragment)片段的整体三维结构,并对模建的结构进行分子力学和动力学优化;对结构的合理性验证显示模建结构是合理的。文章可为预测该特异性单链抗体的生物活性以及研制高亲和力、高特异性的双价抗体提供结构信息。
基金grants from the 863 program of China (No.2006AA02Z158)Wuhan Development Program of China (No. 2003500201628)
文摘The effects of survivin antisense RNA on proliferation of leukemia cell line HL-60 and taxol-induced chemotherapy was explored. A cDNA fragment of survivin obtained by RT-PCR was inserted into a plamid vector named pcDNA3 in the reverse direction. The vector encoding antisense RNA of survivin was confirmed by restriction enzyme digestion and DNA sequencing. The recombinant plasmid was delivered into HL-60 cells by electroporation. Growth curves were plotted based on cell counting. Trypan blue dye exclusion assay and MTT assay were carried out after the cells were incubated with taxol. DNA gel electrophoresis and nuclear staining were performed for cell apoptosis assay. The correct construction of the recombinant plasmid has been identified by restriction enzyme digestion and DNA sequencing. A stable down-regulation has been achieved in HL-60 SVVas cells after G418 selection. Compared to HL-60 cells, the proliferation of HL-60 SVVas cells was significantly inhibited （P〈0.05）. Cytotoxicity assays indicated that IC50 of HL-60 SVVas for taxol was relatively lower than controls （P〈0.01）. Apoptosis assays revealed that taxol-induced apoptosis was detected in HL-60 SVVas cells incubated with 50 ng/ml taxol for 12 h, while in HL-60 cells incubated with 100 ng/ml taxol for 72 h. It was suggested that Survivin antisense RNA could inhibit the proliferation of HL-60 cells and enhance taxol-induced apoptosis in HL-60 cells, which may lay an experimental foundation for further research on gene therapy in leukemia.
