Establishment of the drug resistant cell line of choriocarcinoma and the reversal of drug resistance by transfection of human interleukin 2 gene / 中华妇产科杂志

ABSTRACT

Objective To establish the drug resistant cell line of choriocarcinoma and to study the transfection of the human interleukin 2 (hIL 2) gene into the established drug resistant cell line and investigate the reversal of the multidrug resistance Methods The resistant cell line was established by pulse exposed choriocarcinoma cell line JEG 3 to etopside (VP 16) for ten months The recombinant plasmid containing pcDNA3 1(+) hIL 2 gene was constructed The drug resistant cell line was transfected with the constructed plasmid by lipofectin, and the tumor cell colonies containing the IL 2 sequence were selected by genetin The expression of hIL 2 and drug resistant related genes was detected by reverse transcript polymerase chain reaction The chemosensitivity of the gene transfected tumor cells and the non transfected cell lines to methetraxate, VP 16, kengshengmycine, paclitaxol and 5 fluorouracil was determined by the methyl thiazolyl tetrazolium cytotoxicity assay Results The transfected cells expressed human hIL 2 gene, and showed the reversal of multidrug resistance by methyl thiazolyl tetrazolium assay The transfected cells expressed no multidrug resistance gene 1 (MDR1) on mRNA level Drug resistance index to VP 16 decreased from 38 7 to 6 0 and 6 1, the index to methetraxate decreased from 14 5 to 2 6 and 2 5, to methetraxate from 13 0 to 2 0 Conclusion The transfection of hIL 2 gene into the drug resistance cell line of choriocarcinoma can modulate the MDR1 expression on the mRNA level, and reverse the drug resistance