丹酚酸A逆转肺癌多药耐药基因MDR1相关microRNA的筛选与鉴定

通过将人肺癌A549细胞分为正常对照组和给药组,采用实时定量PCR对MDR1的表达水平进行测定。运用microRNA芯片对给药组和对照组进行microRNA表达谱分析;采用Targetscan预测上调microRNA中与多药耐药基因MDR1相关的miRNA以及实时定量PCR的方法对筛选出的miRNA进行验证,研究丹酚酸A逆转肺癌多药耐药基因MDR1相关microRNA。实验结果表明,与对照组相比,给药组MDR1的表达水平明显下调;microRNA芯片对人肺癌A549细胞的给药组和对照组进行了miRNA表达谱分析,共筛出426个差异表达的miRNA;然后对差异表达上调的miRNA进行靶基因预测,发现有4个明显上调的miRNA与多药耐药基因MDR1相关。对4个miRNA进行实时定量PCR验证,结果与芯片一致。因此认为丹酚酸A下调肺癌多药耐药基因MDR1可能是通过影响miRNA表达进而调控靶基因,对进一步阐明中药逆转多药耐药作用机制提供了实验依据。

Identification of multidrug resistance gene MDR1 associated microRNA of salvianolic acid A reversal in lung cancer

This paper was aimed to investigate the microRNA associated with multidrug resistance gene MDR1 of salvianolic acid A reversal in lung cance. Human lung cancer A549 cells were divided into normal control group and drug group, and the MDR1 expression levels were determined by real-time quantitative PCR. MicroRNA expression profiling of normal control group and drug group were detected by using the latest microRNA microarray. Quantitative RT-PCR was used to validate the differentially expressed miRNA. Forecast of miRNA associated with MDR1 multi-resistant genes of up-regulated miRNA. Experimental results showed that the dosage of MDR1 expression level significantly lowered compared with control group. The miRNA expression spectrum analyses of human lung cancer A549 cells to drug group and the control group were detected by microRNA microarray, 426 differentially expressed miRNA were screened out. Then target prediction were performed for difference up-expression of miRNA and found that there were four obvious increase of miRNA associated with MDR1 multi-resistant genes. Real-time quantitative PCR for 4 microRNA verification, the results were consistent with the chip. So the author considered that salvianolic acid A down lung cancer multidrug resistance gene MDR1 is likely to be affected by the miRNA expression and regulation of target genes, to further clarify the traditional Chinese medicine to reverse multi-drug resistant mechanism provides the experimental basis.