乳腺癌干细胞多药耐药基因的表达及意义

The expression of multi-drug resistance gene in breast cancer stem cells and its significance

目的:探讨乳腺癌干细胞和乳腺癌分化细胞多药耐药基因MDR1、BCRP的表达和意义。方法:采用流式细胞分选技术从人乳腺癌原代组织和MCF-7细胞中分离出乳腺癌干细胞,实时PCR技术测定不同亚群细胞的MDR1和BCRP表达情况。结果:与乳腺癌分化细胞相比,乳腺癌干细胞MDR1和BCRP的表达明显增强(P<0.01),并且在化疗后干细胞比例也明显增加(P<0.01)。结论:和乳腺癌分化细胞相比,乳腺癌干细胞能通过高表达多药耐药基因具有更强的化疗耐药能力,是乳腺癌化疗失败和复发的关键因素之一。

Objective：To detect the expression of multi-drug resistance genes MDR 1 and BCRP in breast cancer stem cells and differentiated cells as well as discuss their clinical significance. Methods：The breast cancer stem cells were separated from human primary breast cancer tissue and MCF-7 cells by flow cytometry-based selection on freshly isolated cells. The expressions of MDR 1 and BCRP in different subsets of cells was measured by real-time PCR. Results：Compared with breast cancer differentiated cells, the expressions of MDR 1 and BCRP in breast cancer stem cells were significantly higher （P〈0.01）, and the proportion of stem cells markedly increased after chemotherapy （P〈0.01）. Conclusion：Compared with breast cancer differentiated cells, breast cancer stem cells have stronger drug-resistance against chemotherapy via over-expression of multidrug resistance genes, which is one of the key factors for failure of chemotherapy and recurrence of breast cancer.