摘要
目的 :研究人参总皂甙 (Totalsaponinspanaxginseng ,TSPG)对人红白血病耐药细胞系K5 6 2 /A0 2耐药性影响及作用机制。方法 :MTT法测定TSPG作用后K5 6 2 /A0 2细胞对阿霉素 (DOX)的药物敏感变化。免疫组化法检测TSPG作用后K5 6 2 /A0 2细胞mdr - 1基因产物P -gp及凋亡调控基因产物bcl- 2的表达。RT -PCR法检测TSPG作用后K5 6 2 /A0 2细胞mdr - 1mRNA表达。结果 :TSPG能增强DOX对K5 6 2 /A0 2细胞的毒性作用 ,逆转效率与浓度相关。TSPG作用后P - gp表达下降有显著差异 (P <0 .0 1) ,bcl- 2表达变化无显著差异 (P >0 .0 5 )。TSPG作用后K5 6 2 /A0 2细胞mdr - 1mRNA表达降低有显著差异 (P <0 .0 1)。结论 :TSPG能部分逆转K5 6 2 /A0 2细胞的耐药性 ,机制主要是下调mdr - 1mRNA表达 ,导致产物P - gp减少 ;与bcl- 2蛋白表达变化无显著相关。
Objective:To research the effect of total saponins Panax ginseng (TSPG) on the drug resistance of human erythroleukemia drug resistant cell line K562/A02 and its mechanism.Methods:The sensitivity of TSPG-treated K562/A02 cells to anticancer drugs was determined by MTT assay.Immunohistochemistry method was used to measure mdr-1 gene product P-gp and apoptosis regulation gene product bcl-2 expression. RT-PCR technique was used to examine mdr-1 mRNA expression.Results:In non-toxic dosages, TSPG strengthened the toxicity effect of doxorubicin on K562/A02 cells, while the reversing effect of TSPG was related to its concentration. Decrease in P-gp expression in K562/A02 cells was marked ( P <0.01) after 3 days of TSPG(150μg/ml)application to K562/A02 cells, but the change in bcl-2 protein expression was insignificant ( P >O. 05)after 3 days of TSPG(150μg/ml)treatment.Decrease in mdr-1 mRNA expression was significant ( P <0.01)after 24 hours of TSPG(150μg/ml) treatment.Conclusion:TSPG partly reverses the drug resistance of K562/A02 cells. The main mechanism by which TSPG reverses the drug resistance of K562/A02 cells is decreasing the expression of mdr-1 mRNA, which then decreases P-gp, the product of mdr-1 mRNA. The relationship between be 1-2 protein expression and the mechanism by which TSPG reverses the drug resistance of K562/A02 cells is not clear.
出处
《重庆医科大学学报》
CAS
CSCD
2003年第4期424-427,435,共5页
Journal of Chongqing Medical University
