目的研究2种低血清培养基对人胚肺二倍体细胞(2BS株)的培养效果及甲型肝炎病毒(hepatitis A virus,HAV)在低血清培养基中的增殖情况。方法使用低血清培养基A+2%新生牛血清、B+5%新生牛血清和E-MEM培养基+10%新生牛血清培养细胞,显微镜...目的研究2种低血清培养基对人胚肺二倍体细胞(2BS株)的培养效果及甲型肝炎病毒(hepatitis A virus,HAV)在低血清培养基中的增殖情况。方法使用低血清培养基A+2%新生牛血清、B+5%新生牛血清和E-MEM培养基+10%新生牛血清培养细胞,显微镜下观察细胞形态、贴壁情况,细胞计数并绘制生长曲线;优化低血清培养基B的血清浓度;使用5层细胞工厂连续传代培养,放大低血清培养基细胞培养工艺;使用低血清培养基连续进行3次细胞传代后接种HAV,检测病毒滴度。结果使用低血清培养基A+2%新生牛血清、B+5%新生牛血清和E-MEM培养基+10%新生牛血清,细胞生长密度峰值分别为1.55×10^(5)、2.07×10^(5)和1.30×10^(5)个/cm^(2),统计学分析表明,低血清培养基B+5%新生牛血清达到细胞生长密度峰值高于低血清培养基A+2%新生牛血清和E-MEM+10%新生牛血清,差异具有统计学意义(P均<0.05);低血清培养基B+5%新生牛血清同B+3%新生牛血清连续培养3代细胞生长密度差异均无统计学意义(P=0.47、0.07、0.12);使用5层细胞工厂培养细胞,低血清培养基A+2%新生牛血清、B+5%新生牛血清连续培养3代,细胞生长密度均高于E-MEM+10%新生牛血清;低血清培养基B+3%新生牛血清与低血清培养基B+5%新生牛血清的病毒滴度分别为9.50和9.33 lgCCID_(50)/mL,低血清培养基A+2%新生牛血清和E-MEM+10%新生牛血清的病毒滴度分别为8.50和9.00 lgCCID_(50)/mL。结论低血清培养基适用于培养2BS细胞增殖HAV,为低血清培养基在甲肝疫苗生产中的应用奠定了基础。展开更多
To investigate the adaptation of poliovirus Sabin 2 in human embryonic lung diploid fibroblast（KMB17） and its relation to nucleotide mutations of 5′ noncoding region（5′NCR）,the Sabin 2 vaccine virus was passaged...To investigate the adaptation of poliovirus Sabin 2 in human embryonic lung diploid fibroblast（KMB17） and its relation to nucleotide mutations of 5′ noncoding region（5′NCR）,the Sabin 2 vaccine virus was passaged serially in KMB17 for seventeen passages.The infectious titers of Sabin 2 virus increased along with the passages,the highest titer reached 8.0 LgCCID50/ml at passage 13（P13）.During passage,there were three nucleotide mutations appeared in 5′NCR,G changed to C at position 20,C to U at position 189 and G to A at position 481.The results showed that Sabin 2 poliovirus adapted well in KMB17 after 17 passages.The nucleotide mutation at position 481 that appeared from passage 3 on indicated the possibility of virulent reversion.展开更多
文摘目的研究2种低血清培养基对人胚肺二倍体细胞(2BS株)的培养效果及甲型肝炎病毒(hepatitis A virus,HAV)在低血清培养基中的增殖情况。方法使用低血清培养基A+2%新生牛血清、B+5%新生牛血清和E-MEM培养基+10%新生牛血清培养细胞,显微镜下观察细胞形态、贴壁情况,细胞计数并绘制生长曲线;优化低血清培养基B的血清浓度;使用5层细胞工厂连续传代培养,放大低血清培养基细胞培养工艺;使用低血清培养基连续进行3次细胞传代后接种HAV,检测病毒滴度。结果使用低血清培养基A+2%新生牛血清、B+5%新生牛血清和E-MEM培养基+10%新生牛血清,细胞生长密度峰值分别为1.55×10^(5)、2.07×10^(5)和1.30×10^(5)个/cm^(2),统计学分析表明,低血清培养基B+5%新生牛血清达到细胞生长密度峰值高于低血清培养基A+2%新生牛血清和E-MEM+10%新生牛血清,差异具有统计学意义(P均<0.05);低血清培养基B+5%新生牛血清同B+3%新生牛血清连续培养3代细胞生长密度差异均无统计学意义(P=0.47、0.07、0.12);使用5层细胞工厂培养细胞,低血清培养基A+2%新生牛血清、B+5%新生牛血清连续培养3代,细胞生长密度均高于E-MEM+10%新生牛血清;低血清培养基B+3%新生牛血清与低血清培养基B+5%新生牛血清的病毒滴度分别为9.50和9.33 lgCCID_(50)/mL,低血清培养基A+2%新生牛血清和E-MEM+10%新生牛血清的病毒滴度分别为8.50和9.00 lgCCID_(50)/mL。结论低血清培养基适用于培养2BS细胞增殖HAV,为低血清培养基在甲肝疫苗生产中的应用奠定了基础。
文摘目的筛选Ⅰ型登革病毒(Dengue virus,DV)中国株D06063人胚肺二倍体细胞KMB17的适应株,经噬斑纯化后,分析其生物学特性。方法将Ⅰ型DV中国株D06063在C6/36细胞上进行扩增,采用微量滴定法测定病毒的感染性滴度;RT-PCR法鉴定DV型别;病毒连续以4.0 MOI的量感染KMB17细胞,传代至病毒完全适应在细胞内扩增,再连续传10代,筛选出KMB17细胞适应株,并进行3轮噬斑纯化;免疫荧光法检测纯化病毒,电镜观察病毒颗粒的形态。结果在C6/36细胞上扩增的Ⅰ型DV D06063株的滴度为6.0 lg CCID50/ml,经RT-PCR可扩增出511 bp的DV特异基因和482 bp的Ⅰ型DV型特异性基因;病毒感染KMB17细胞后,可产生明显的细胞病变,至第10代,病毒的感染性滴度达峰值,为6.75 lg CCID50/ml;纯化的病毒经免疫荧光检测呈阳性,电镜观察显示病毒形态正常。结论成功筛选出传代稳定性好、病毒扩增量高的Ⅰ型DVKMB17细胞适应株,纯化的病毒株保持了原始毒株的基本生物学特性。
文摘To investigate the adaptation of poliovirus Sabin 2 in human embryonic lung diploid fibroblast（KMB17） and its relation to nucleotide mutations of 5′ noncoding region（5′NCR）,the Sabin 2 vaccine virus was passaged serially in KMB17 for seventeen passages.The infectious titers of Sabin 2 virus increased along with the passages,the highest titer reached 8.0 LgCCID50/ml at passage 13（P13）.During passage,there were three nucleotide mutations appeared in 5′NCR,G changed to C at position 20,C to U at position 189 and G to A at position 481.The results showed that Sabin 2 poliovirus adapted well in KMB17 after 17 passages.The nucleotide mutation at position 481 that appeared from passage 3 on indicated the possibility of virulent reversion.
