Under the prerequisite that the incidence of cancer or tumor in negative-control nude mice inoculated subcutaneously with primary feline or canine kidney cell cultures purified in vitro at passage 3 was 0 (0/22) and 0...Under the prerequisite that the incidence of cancer or tumor in negative-control nude mice inoculated subcutaneously with primary feline or canine kidney cell cultures purified in vitro at passage 3 was 0 (0/22) and 0 (0/10), respectively. The incidence of the progressively-growing malignant tumor(MT) in positive-control nude mice inoculated subcutaneously with Hela cell cultures of KB, X, or NM20/X strain was 10/ 10, 25/25 and 5/51, respectively. The results showed that the incidence of tumor in nude mice with di-and hy-perploid YB strain of MDCK cell during 17 - 23 passages, with hyper- and hypoploid KA strain of MDCK cell during 6-8 passages, with hypoploid WB strain of MDCK cell on passage 6, with hyper-and hypoploid H strain of MDCK cell during 8-24 passages was 2/24, 6/10, 5/10 and 10/15, respectively. The chromosomal analysis results showed that the ratio of difference in the rate of modal chromosome number between high(mcs + n) and lowest (mcs)passages was not more than 5 - 15% and the structure aberrations was generally 0 -3 %. These results proved that the genetic characteristics of chromosomal number of cell lines determines their tumorigenicity, but it is species-specific. MDCK line has tumorigenicity no matter what its chromosome kary-otype is, at least it has very low tumorigenicity even when its modal chromosome number is hypoploid. It is thus evident that MDCK cell of WB or H strain can be approved as substrate for the preparation of attenuated viral vaccines, but MDCK cell of YB or KA strain can not be approved as substrate for the preparation of attenuated viral vaccines.展开更多
目的采用两种不同的方法进行人用疫苗生产用工作细胞库Vero细胞的鉴别,为提高人用疫苗生产用细胞的准确性及疫苗的安全性提供保障。方法采用短串联重复序列(short tandem repeat,STR)-PCR基因分型法对本所疫苗生产用Vero细胞的8个STR位...目的采用两种不同的方法进行人用疫苗生产用工作细胞库Vero细胞的鉴别,为提高人用疫苗生产用细胞的准确性及疫苗的安全性提供保障。方法采用短串联重复序列(short tandem repeat,STR)-PCR基因分型法对本所疫苗生产用Vero细胞的8个STR位点(D8S1106、D1S518、D6S1017、D17S1304、D4S2408、D5S1467、D19S245和DYS389)进行测定,并与文献报道的结果进行比对分析;采用染色体核型检查法,将Vero细胞经Giemsa染料染色,于显微镜下精确计数100个细胞的染色体后,统计染色体数为58或60条的细胞所占比例。结果 STR基因分型得到的特征性图谱与文献报道的结果完全相同,未出现三单位基因,且STR的重复数完全相同;高倍镜下精确计数100个细胞染色体数为58或60条的细胞所占比例为79%。结论本所疫苗生产用工作细胞库Vero细胞为正确细胞株,不存在污染或交叉污染的情况,为本所人用疫苗的安全性和准确性提供了保障。展开更多
文摘Under the prerequisite that the incidence of cancer or tumor in negative-control nude mice inoculated subcutaneously with primary feline or canine kidney cell cultures purified in vitro at passage 3 was 0 (0/22) and 0 (0/10), respectively. The incidence of the progressively-growing malignant tumor(MT) in positive-control nude mice inoculated subcutaneously with Hela cell cultures of KB, X, or NM20/X strain was 10/ 10, 25/25 and 5/51, respectively. The results showed that the incidence of tumor in nude mice with di-and hy-perploid YB strain of MDCK cell during 17 - 23 passages, with hyper- and hypoploid KA strain of MDCK cell during 6-8 passages, with hypoploid WB strain of MDCK cell on passage 6, with hyper-and hypoploid H strain of MDCK cell during 8-24 passages was 2/24, 6/10, 5/10 and 10/15, respectively. The chromosomal analysis results showed that the ratio of difference in the rate of modal chromosome number between high(mcs + n) and lowest (mcs)passages was not more than 5 - 15% and the structure aberrations was generally 0 -3 %. These results proved that the genetic characteristics of chromosomal number of cell lines determines their tumorigenicity, but it is species-specific. MDCK line has tumorigenicity no matter what its chromosome kary-otype is, at least it has very low tumorigenicity even when its modal chromosome number is hypoploid. It is thus evident that MDCK cell of WB or H strain can be approved as substrate for the preparation of attenuated viral vaccines, but MDCK cell of YB or KA strain can not be approved as substrate for the preparation of attenuated viral vaccines.
文摘目的采用两种不同的方法进行人用疫苗生产用工作细胞库Vero细胞的鉴别,为提高人用疫苗生产用细胞的准确性及疫苗的安全性提供保障。方法采用短串联重复序列(short tandem repeat,STR)-PCR基因分型法对本所疫苗生产用Vero细胞的8个STR位点(D8S1106、D1S518、D6S1017、D17S1304、D4S2408、D5S1467、D19S245和DYS389)进行测定,并与文献报道的结果进行比对分析;采用染色体核型检查法,将Vero细胞经Giemsa染料染色,于显微镜下精确计数100个细胞的染色体后,统计染色体数为58或60条的细胞所占比例。结果 STR基因分型得到的特征性图谱与文献报道的结果完全相同,未出现三单位基因,且STR的重复数完全相同;高倍镜下精确计数100个细胞染色体数为58或60条的细胞所占比例为79%。结论本所疫苗生产用工作细胞库Vero细胞为正确细胞株,不存在污染或交叉污染的情况,为本所人用疫苗的安全性和准确性提供了保障。
