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作 者:林娟[1] 邢宏运[1] 龚玉萍[1] 杨曦[1] 郭勇[1] 单卿卿[1] 周睿卿[1]
机构地区:[1]四川大学华西医院血液科生物治疗国家重点实验室,成都610041
出 处:《四川大学学报(医学版)》2012年第5期657-660,665,共5页Journal of Sichuan University(Medical Sciences)
基 金:国家自然科学基金(No.30770912);四川省科技厅社会公益项目(No.2008SZ0017);教育部回国留学人员启动金(No.20071108-18-4)资助
摘 要:目的研究多药耐药基因MDR1在Ph(+)急性淋巴细胞白血病〔Ph(+)ALL〕伊马替尼(IM)耐药细胞株SUP-B15/RI耐药机制中的作用。方法 RT-PCR技术检测敏感细胞株SUP-B15和IM耐药细胞株SUP-B15/RI MDR1mRNA表达,改良MTT法测定IM、柔红霉素(DNR)、长春新碱(VCR)、依托泊甙(VP-16)单药及联合维拉帕米作用于SUP-B15细胞和SUP-B15/RI细胞72h后增殖活性的改变,计算抑制率为50%时的药物浓度(IC50),DNR药物外排实验检测MDR1表达产物P-gp功能。结果 MDR1基因在SUP-B15/RI中的表达是敏感细胞SUP-B15的(2.02±0.04)倍(P<0.05)。IM、DNR、VCR、VP-16单药作用于SUP-B15/RI细胞的IC50值较SUP-B15细胞增高(P<0.05),相对耐药倍数(RF)分别为(20.52±2.34)、(10.33±1.88)、(9.78±1.27)、(3.84±0.69)倍。IM、DNR、VCR、VP-16与维拉帕米联合作用于SUP-B15/RI细胞后IC50值较单药时降低(P<0.05),耐药逆转倍数分别为(1.44±0.43)、(3.20±0.17)、(1.44±0.12)、(1.33±0.14)。P-gp蛋白功能在SUP-B15/RI细胞强于SUP-B15细胞,DNR泵出率分别为10.27%、3.43%。结论 MDR1基因在SUP-B15/RI细胞中表达增加,其表达产物P-gp功能增强,P-gp抑制剂维拉帕米可以部分逆转IM耐药。说明MDR1参与SUP-B15/RI细胞IM耐药机制的形成。Objective To investigate the contribution of muhidrug-resistant gene MDR1 to development of imatinib-resistance in Ph(+)acute lymphoblastic leukemia cell line SUP-BaS/RI. Methods RT-PCR was used to examine MDR1 mRNA levels, cytotoxic effects of imatinib (IM), daunorubicin (DNR), vincristine (VCR), etoposide (VP-16) and the synergetic antiproliferation with P-gp inhibitor verapamil on sensitive SUP-B15 and SUP- B15/RI cell lines were detected by the MTT assay. The P-gp function was measured by flow cytometry. Results Increased expression of MDR1 gene in SUP-B15/RI than that of SUP-B15 cell line (P〈0.05) was observed when detected with RT-PCR. The IC50 values of SUP-B15/RI cell line inhibited by IM, DNR, VCR, VP-16 for 72 hours was higher than that of SUP-B15 (P〈0.05) and the resistant factor (RF) was (20. 52±9~. 34),(10. 33±1. 88), (9.78± 1. 27), (3. 84±0. 69) respectively. The IC50 values of IM, DNR, VCR, VP-16 combined with P-gp inhibitor verapamil were decreased in SUP-B15/RI cells (P〈0.05), reversal of drug resistance was (1.44± 0.43), (3.20±0.17),(1.44±0.12),(1.33±0.14) respectively. The activity of P-gp in SUP-B15/RI measured by flow cytometry was higher than that of P-gp in SUP-B15/RI cell line. Conclusion The overexpression of MDR1 mRNA and higher activity of P gp is partially responsible for acquiring of imatinib resistance in SUP-B15/RI cell line. P-gp inhibitor verapamail can partially restored the sensitivity of the SUP-B15/RI cell line to anticancer agents.
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