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机构地区:[1]安徽医科大学附属省立医院,安徽省临床检验中心,合肥市230001
出 处:《实用检验医师杂志》2013年第1期10-13,共4页Chinese Journal of Clinical Pathologist
基 金:国家自然科学基金资助项目(30672011);安徽省自然科学基金资助项目(050430902);安徽省人才开发资金资助项目(20052040)
摘 要:【摘要】目的探讨表皮生长因子受体(epidermalgrowthfactorreceptor,EGFR)在氨甲喋呤(methotrexate,MTX)对映体L-(+)-MTX和D-(-)-MTX耐药A549细胞株中的表达。方法采用RT-PCR方法测定肺癌A549敏感细胞株和15p,moUL、35p,mol/L、55p,mol/L的L-(+)-MTX和D-(-)-MTXA549耐药细胞株中EGFRmRNA表达情况。结果15μmol/L、35μmol/L、55μmol/LL-(+)-MTXA549耐药细胞株中EGFR基因表达的mRNA相对含量分别为肺癌A549敏感细胞株的(1.55±0.26)倍、(1.86±0.13)倍、(1.20~0.05)倍。RT—PCR结果显示,A549敏感细胞株和L-(+)-MTX各浓度A549耐药株均扩增出315bp条带,有EGFR基因表达,而3种浓度的D-(-)-MTX耐药细胞株中EGFR基因不表达。结论MTX诱导耐药后A549细胞株中EGFRmRNA发生变化,且在3种浓度两种对映体细胞株间具有明显的手性差异,MTX可能通过改变EGFR基因启动子的甲基化状态,影响EGFR的表达。Objective To study the expression of epidermal growth factor receptor (EGFR) in methotrexate (MTX) enantiomer-resistant A549 cell lines [L-(+)-MTX and D-(-)-MTX]. Methods The ex- pression of EGFR on genetic level was determined by RT-PCR in lung cancer A549 sensitive cells, and MTX enantiomer-resistant A549 cells [L-(+)-MTX and D-(-)-MTX], with the concentration of drug resistance was 15 μmol/L, 35 txmol/L, 55 μmol/L. Results The genetic expression levels of EGFR were (1.55 ±0.26), (1.86±0.13) and (1.20±0.05) folds in L-(+)-MTX/A549 cells compared with lung cancer A549 sensitive cells. RT-PCR results showed that there were 315 bp bands in A549 sensitive cell and L-(+)-MTX/A549 cells, but in D-(-)-MTX/A549 cells barely expressed. Conclusion The expression level of EGFR on genetic level in drug resistant cells have been changed, and significant difference in two enantiomer-resistant cells are ap- peared. The expression of EGFR is affected by MTX which alte the methylation status of EGFR.
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