Abstract
BACKGROUND: Cancer stem cells (CSCs) are responsible for multi-drug resistance in tumors. CD133 is a known biomarker of CSCs. The aim of this study is to screen for drug-resistant differentially expressed genes in CD133+ and CD133- lung cancer cells and to identify novel lung tumor drug-resistant genes. METHODS: Magnetic activated cell sorting was used to isolate CD133+ and CD133- cells from human lung cancer cell line A549, and drug-resistant microarray was used to detect drug-resistant genes in the these cells. RT-qPCR was used to examine the expression of six lung tumor drug-resistant genes in pre- and post-chemotherapeutic A549 cells. RESULTS: A total of 31 differentially expressed genes were screened by microarray analysis. Of these genes, 30 were upregulated and one was downregulated in CD133+ cells compared with CD133- cells. Results were verified by RT-qPCR. CYP2C19, CYP2D6, CYP2E1, GSK3α, PPARα, and PPARβ/δ were significantly upregulated after the A549 cells were treated with 1.97 μg/mL DDP or 0.61 μg/mL doxorubicin for 48 h. CONCLUSIONS: The drug resistance of lung adenosarcoma may be correlated with 31 differentially expressed genes screened by drug-resistant microarray. CYP2C19, CYP2D6, CYP2E1, GSK3α, PPARα, and PPARβ/δ might be novel lung adenosarcoma drug-resistant genes.