酪氨酸激酶抑制剂逆转K562/A02细胞多药耐药的研究

本研究旨在比较酪氨酸激酶抑制剂伊马替尼(Imatinib)、尼洛替尼(Nilotinib)对K562/A02细胞多药耐药的逆转作用。用RT-PCR法检测各组mdr-1mRNA、bcr-abl mRNA表达;用Western blot法检测各组P-gp、P210蛋白表达;用流式细胞术检测各组细胞内柔红霉素(DNR)的蓄积。结果表明:0.0625μmol/L伊马替尼、5nmol/L尼洛替尼对K562/A02细胞无明显细胞毒性,伊马替尼和尼洛替尼上述剂量单独作用48小时均下调mdr-1mRNA、bcr-abl mRNA、P-gp、P210蛋白的表达,且尼洛替尼较伊马替尼作用更强。荧光强度检测显示,K562/A02细胞经伊马替尼、尼洛替尼单独处理48小时后,其细胞内DNR浓度分别为K562细胞中的7.85%、12.02%。结论:酪氨酸激酶抑制剂具有很好的逆转细胞耐药作用,且尼洛替尼较伊马替尼逆转作用更强。

Reversal of Multidrug-resistance in Human Leukemia Cell Line K562/A02 by Tyrosine Kinase Inhibitors

This study was aimed to investigate the reversal effect of tyrosine kinase inhibitors （TKI） Imatinib and Nilotinib on multidrug-resistant cell line K562/A02. The expression levels of mdr-1 mRNA and bcr-abl mRNA were assayed by RT-PCR. The protein levels of P-glycoprotein （P-gp） and P210 were detected by Western blot. The daunorubicin （DNR） accumulation in K562/A02 cells were analyzed by flow cytometry （FCM）. The results showed that the 0. 0625 ixmol/L Imatinib or 5 nmol/L Nilotinib alone had no cytotoxic effect on the inhibition of K562/A02 cells. When K562/A02 cells were treated with Imatinib or Nilotinib alone for 48 hours, the expressions of mdr-1 mRNA, der/abl mRNA, P-gp and P210 protein were all down-regulacted, furthemore the effect of Nilotinib was stronger than that of Imatinib. The detection of fluorescence intensity revealed that the DNR concentration in K562/A02 cells treated with Imatinib or Nilotinib alone for 48 hours were 7.85% and 12.02% of K562 cells respectively. It is concluded that the tyrosine kinase inhibitors show great effect reversing drug resistance of cells, moreover, the effect of Nilotinib is stronger than that of Imatinib.