Carcinogenesis, Teratogenesis & Mutagenesis

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Construction of a human bronchial epithelial  hsa-miR-148a-3p  knockdown cell line

XIE Xing1,2, KE Yue-bin2,*, LIU Qing-cheng2, LIU Jian-jun2, MAO Kan-lang1,2,XU Xin-yun2, XIA Bo2, YANG Lin-qing2   

  • Received:2014-01-20 Revised:2014-03-10

Abstract:

OBJECTIVE: To construct a 16HBE cell line with low expression of hsa-miR-148a-3p. METHODS:A pair of TuD RNA sequences of hsa-miR-148a-3p was designed according to information provided in miRBase, which was ligated to lentiviral vector pLKO.1-puro afterwards. The recombinant vector was transfected into 293FT cells for lentivirus packaging. The viruses were collected and used to infect normal 16HBE cells. The target cells were selected with Puromycin and was identified by quantitative PCR. The mRNA expression and the protein expression level of DNMT1 were then tested. RESULTS:Sequencing results indicated the successful construction of recombinant lentiviral vector with hsa-miR-148a-3p TuD RNA, quantitative PCR showed that the expression level of hsa-miR-148a-3p in the target cells was 44% lower than that of normal 16HBE cells(P<0.01), whereas a 3.4-fold increase of the mRNA expression level and a two-fold increase of protein expression level of DNMT1 were observed in the cell line(P<0.01). CONCLUSION:Low expression of hsa-miR-148a-3p of 16HBE cell line was successfully constructed, and inhibition of hsa-miR-148a-3p could lead to higher expression and higher protein levels of DNMT1.

Key words: hsa-miR-148a-3p, DNMT1, 16HBE cells, lentivirus