A series of bioassays such as sister chromatid exchange frequencies ( SCE.), chromosomal aberration ( CA ), micronuclel rate (MN) and cell-cycle delay have been used to detecting the genotoxic effect of cigarette smok...A series of bioassays such as sister chromatid exchange frequencies ( SCE.), chromosomal aberration ( CA ), micronuclel rate (MN) and cell-cycle delay have been used to detecting the genotoxic effect of cigarette smoke condensate (CSC) on human diploid cell 2BS strain. The results suggested that a higher SCE, ( 17. 0/ cell) was observed In 2BS cells treated with CSC at 100 μg/ml, as compared with 6. 9/cell of the background (P<0. 001). CA rate was significantly increased from 4% to 36% In cells treated with 10 μg/ml CSC (P< 0.001). MN rate varied from 9 -26‰ In cells treated with CSC compared to that of control (6‰). Meanwhile, the cell-cycle of cells was markedly delayed by CSC. The survival rate of 2BS cells declined to 59. 6% for treatment with CSC at 200 μg/ ml. There was a dose-effect response In SCE., CA, MN rate. We proposed that active oxygen might responsible for genotoxiclty of CSC on cells.展开更多
目的：探讨不同感染复数（Multiplicity of infection,MOI）的狂犬病毒PM株在人二倍体细胞（2BS株）中增殖的影响,确定感染复数。方法将狂犬病毒PM株按照MOI 0.01、0.02、0.05、0.10、0.15、0.20接种至2BS细胞中,用显微镜观察接种病毒...目的：探讨不同感染复数（Multiplicity of infection,MOI）的狂犬病毒PM株在人二倍体细胞（2BS株）中增殖的影响,确定感染复数。方法将狂犬病毒PM株按照MOI 0.01、0.02、0.05、0.10、0.15、0.20接种至2BS细胞中,用显微镜观察接种病毒后细胞的形态变化；培养3-5d后,第一次收获病毒液；更换培养液继续培养3-4d后,进行第二次收获。采用小鼠脑内滴定法测定狂犬病毒滴度,通过NIH法测定灭活病毒液的效价。结果当MOI为0.05-0.10时,细胞圆缩30%-40%,细胞能维持较好的生长形态,可收获病毒,病毒收获液的滴度较高（〉5.0 lgLD50/mL）,且灭活后病毒液的效价较高（〉4.0IU/mL）。结论确定狂犬病毒PM株在人二倍体2BS细胞增殖的适宜MOI,为人用狂犬病疫苗生产工艺的优化提供了依据。展开更多
目的鉴定本所自主建立的人用疫苗生产用人二倍体细胞株KMB17的正确性。方法用染色体核型检查法和短串联重复序列(short tandem repeat,STR)基因分型法对本所疫苗生产用人二倍体细胞株KMB17进行鉴定。将疫苗生产用KMB17细胞经秋水仙素处...目的鉴定本所自主建立的人用疫苗生产用人二倍体细胞株KMB17的正确性。方法用染色体核型检查法和短串联重复序列(short tandem repeat,STR)基因分型法对本所疫苗生产用人二倍体细胞株KMB17进行鉴定。将疫苗生产用KMB17细胞经秋水仙素处理,积累中期相染色体后,低渗条件下释放出染色体,吉姆萨染料染色制片,镜检,观察染色体结构,精确计数100个细胞的染色体数目;选取人源细胞的20个STR位点对KMB17细胞进行DNA分型,并将获得的STR图谱与ATCC和DSMZ数据库进行比对分析。结果高倍镜下观察可见,样品细胞染色体组结构正常,无缺失和突变;精确计数100个细胞中,染色体数为46的细胞数有84个,无染色单体和染色体断裂细胞,无结构异常细胞,亚二倍体细胞14个,超二倍体细胞数2个。STR基因分型获得的特征性图谱清晰,未出现三单位基因,在ATCC和DSMZ数据库中均未找到与其细胞分型完全匹配的细胞株。结论本所自主建立的疫苗生产用人二倍体细胞株KMB17的细胞染色体结构和数目均正常,不存在污染和交叉污染,为正确细胞株。展开更多
文摘A series of bioassays such as sister chromatid exchange frequencies ( SCE.), chromosomal aberration ( CA ), micronuclel rate (MN) and cell-cycle delay have been used to detecting the genotoxic effect of cigarette smoke condensate (CSC) on human diploid cell 2BS strain. The results suggested that a higher SCE, ( 17. 0/ cell) was observed In 2BS cells treated with CSC at 100 μg/ml, as compared with 6. 9/cell of the background (P<0. 001). CA rate was significantly increased from 4% to 36% In cells treated with 10 μg/ml CSC (P< 0.001). MN rate varied from 9 -26‰ In cells treated with CSC compared to that of control (6‰). Meanwhile, the cell-cycle of cells was markedly delayed by CSC. The survival rate of 2BS cells declined to 59. 6% for treatment with CSC at 200 μg/ ml. There was a dose-effect response In SCE., CA, MN rate. We proposed that active oxygen might responsible for genotoxiclty of CSC on cells.
文摘目的：探讨不同感染复数（Multiplicity of infection,MOI）的狂犬病毒PM株在人二倍体细胞（2BS株）中增殖的影响,确定感染复数。方法将狂犬病毒PM株按照MOI 0.01、0.02、0.05、0.10、0.15、0.20接种至2BS细胞中,用显微镜观察接种病毒后细胞的形态变化；培养3-5d后,第一次收获病毒液；更换培养液继续培养3-4d后,进行第二次收获。采用小鼠脑内滴定法测定狂犬病毒滴度,通过NIH法测定灭活病毒液的效价。结果当MOI为0.05-0.10时,细胞圆缩30%-40%,细胞能维持较好的生长形态,可收获病毒,病毒收获液的滴度较高（〉5.0 lgLD50/mL）,且灭活后病毒液的效价较高（〉4.0IU/mL）。结论确定狂犬病毒PM株在人二倍体2BS细胞增殖的适宜MOI,为人用狂犬病疫苗生产工艺的优化提供了依据。
文摘目的鉴定本所自主建立的人用疫苗生产用人二倍体细胞株KMB17的正确性。方法用染色体核型检查法和短串联重复序列(short tandem repeat,STR)基因分型法对本所疫苗生产用人二倍体细胞株KMB17进行鉴定。将疫苗生产用KMB17细胞经秋水仙素处理,积累中期相染色体后,低渗条件下释放出染色体,吉姆萨染料染色制片,镜检,观察染色体结构,精确计数100个细胞的染色体数目;选取人源细胞的20个STR位点对KMB17细胞进行DNA分型,并将获得的STR图谱与ATCC和DSMZ数据库进行比对分析。结果高倍镜下观察可见,样品细胞染色体组结构正常,无缺失和突变;精确计数100个细胞中,染色体数为46的细胞数有84个,无染色单体和染色体断裂细胞,无结构异常细胞,亚二倍体细胞14个,超二倍体细胞数2个。STR基因分型获得的特征性图谱清晰,未出现三单位基因,在ATCC和DSMZ数据库中均未找到与其细胞分型完全匹配的细胞株。结论本所自主建立的疫苗生产用人二倍体细胞株KMB17的细胞染色体结构和数目均正常,不存在污染和交叉污染,为正确细胞株。
