摘要
目的 :探讨人凝血因子 (F )内含子 1片段正向插入逆转录病毒载体对骨骼肌细胞表达 F 的影响。 方法 :将含F 内含子 1片段的 F 微小基因 m 1和 m 2正向插入 L SN逆转录病毒载体的 Bam H 位点 ,取代 F c DNA,获得 m 1SN和 L m 2 SN载体 ,在小鼠成肌细胞进行瞬时和稳定表达试验。结果 :L m 1SN的 m 2 SN载体的病毒滴度、在成肌细胞中瞬时表达和稳定表达 F 的水平 ,均比不含内含子的 L SN增高 1～ 2倍 ,小部分病毒 RNA中的内含子在包装细胞中未被剪接去除而转入了靶细胞。结论 :人 F 内含子 1片段正向插入逆转录病毒载体对提高病毒滴度和 F 的表达水平有一定作用。
Objective:To investigate the effects of human factor Ⅸ (FⅨ) intron 1 inserted in forward orientation into retroviral vector on the expression of FⅨ in muscle cells. Methods: Two FⅨ mini-genes, FⅨm1 and FⅨm2, were inserted in forward orientation into retroviral vector backbone, LⅨSN, constructing 2 vectors named LⅨm1SN and LⅨm2SN, containing shortened intron of 1.4 and 0.3 kb, respectively. Retrovirus was made by transfecting PA317 packaging cells. Transient and stable expression of FⅨ was tested in SCID mouse muscle cells (SCID-MB). Results: The vector titers and expression levels of LⅨm1SN and LⅨm2SN in SCID-MB were 1 to 2 folds higher than that of LⅨSN. Some SCID-MB colonies transfected with LⅨm2SN contained intact FⅨm2 inton elements, suggesting that splicing of virus mRNA may not be complete in packaging cells. Conclusion: FⅨ intron 1 inserted in forward orientation in retroviral vectors can increase retroviral titer and the expression level of FⅨ in muscle cells.
出处
《第二军医大学学报》
CAS
CSCD
北大核心
2002年第9期971-974,共4页
Academic Journal of Second Military Medical University
基金
上海市科委回国人员启动基金资助项目 ( 97-2 4)
