miR-424慢病毒表达载体的构建及其对宫颈癌细胞增殖的影响

Construction of the lentivirus vector containing the miR-424 gene and its influence on proliferation of cervical cancer cell line

目的构建hsa-miR-424基因慢病毒表达载体,并鉴定miR-424在细胞内表达水平,研究hsa-miR-424对宫颈癌Hela细胞增殖的影响。方法以人基因组DNA为模板,设计合成miR-424的上下游引物,PCR扩增目的片段,回收产物将其连入pMD18T载体中,进行测序。再以pMD18T-miR424为模板进行PCR扩增,将其中表达pMD18T-miR424的结构经酶切后插入pLentis-CMV-GFP-MCS-PGK-PURO载体,构建成pLentis-CMV-GFP-miR424-PGK-PURO,在293T细胞中与pSPAX2、pMD2.G包装产生所需的慢病毒,再用含慢病毒的上清液感染Hela细胞。结果 miR-424基因与慢病毒载体连接成功,测序结果证明了插入到质粒载体中的miR-424前体序列完全正确,成功构建pLentis-CMV-GFP-miR424重组慢病毒载体,用其感染宫颈癌Hela细胞后上调miR-424的表达近60倍。采用MTT法检测增殖结果提示:感染miR-424慢病毒的宫颈癌Hela细胞株均存在细胞增殖减慢。结论成功的构建了miR-424慢病毒载体,建立了高效稳定表达miR-424的细胞株,并用含慢病毒的上清液感染宫颈癌Hela细胞,成功抑制了Hela细胞的增殖,为后续相关的研究奠定了良好的基础。

Objective To construct the lentivirus vector containing the hsa‐miR‐424 gene ,and identify the expression level of miR‐424 in cells .Research the influence of hsa‐miR‐424 on proliferation of cervical cancer Hela cell line .Methods Using the human genomic DNA as template to design the upper and lower primers for synthesis of miR‐424 ,and amplifying the target fragment by polymerase chain reaction （PCR） .Recover the products and conduct sequencing after connecting it into the pMD18T vector .Ampli‐fy the product by PCR template as pMD18T‐miR424 ,and insert the fragment expressing pMD18T‐miR424 into the vector of pLen‐tis‐CMV‐GFP‐MCS‐PGK‐PURO after enzyme cutting to construct the pLentis‐CMV‐GFP‐miR424‐PGK‐PURO .Package the com‐pound with pMD2 .G and pSPAX2 in 293T cell to produce the lentivirus ,and using the supernatant containing lentivirus to infect the Hela cell line .Results The sequencing result proved the sequence of miR‐424 in plasmid vector was correct ,which proved the construction of lentivirus was successful and the target lentivirus was obtained .The expression of miR‐424 almost rise 60 times af‐ter infected the cervical cancer Hela cell by the carrier .The result of MTT method suggested ：the cervical cancer Hela cell lines have slowed proliferation with infection miR‐424 lentivirus .Conclusion The miR‐424 lentivirus vector was constructed successfully and the high efficacy expression miR‐424 cell line was established and stable .The cervical cancer Hela cell were infected with the super‐natant containing lentivirus ,inhibited the proliferation of Hela cell successfully ,and laid a good foundation for subsequent research .