中文摘要：

目的：研究乳腺癌转移抑制基因1（breast cancer metastasis suppressor gene1，BRMS1）对人乳腺癌细胞运动能力的影响。方法：构建BRMS1真核表达载体，利用Lipofectin2000转染肺高转移潜能乳腺癌细胞MDA-MB-231-HM，荧光实时定量PCR检测目的基因表达，Transwell实验检测细胞运动能力。同时，设计3对针对BRMS1的特异小干扰RNA（smallinterferingRNA，siRNA），通过荧光实时定量PCR筛选出最有效的siRNA，干扰人乳腺癌细胞MDA-MB-231，观察干扰后细胞运动能力的变化。结果：与转染空载体的细胞相比，稳定转染BRMS1的MDA-MB-231-HM细胞穿过膜的数量减少51．9％。筛选出1对有效siRNA能明显下调BRMS1，用此siRNA干扰MDA-MB-231细胞后，其穿过膜的细胞数量增加17．9％。结论：BRMS1能抑制人乳腺癌细胞的运动，提示其可能通过抑制人乳腺癌细胞运动而抑制肿瘤远处转移。

英文摘要：

Objective： To study the effect of breast cancer metastasis suppressor gene 1 （BRMS1） on the migration of human breast cancer cells. Methods：An eukaryotic expression vector containing BRMS1 was constructed and was transfected into human breast cancer MDA-MB-231-HM cells by using Lipofectin 2000. Expression of BRMS1 mRNA was detected by real-time PCR. The migration of the cells was assayed by Transwell test. Meanwhile, three pairs of siRNA targeting BRMS1 were designed. The most effective siRNA was screened by real-time PCR and transfected into MDA-MB-231 cells. The migration ability of the transfected cells was detected. Re- suits：Compared with the cells transfected with empty vector, the number of MDA-MB-231-HM cells on the underlayer of transwell de- creased by 51.9% after stably transfected with BRMS1. One pair of siRNA was selected which could notably down-regulated BRMS1 expression at mRNA level. After siRNA transfection, the number of MDA-MB-231 cells on the underlayer of transwell increased by 17.9%. Concluslon：BRMS1 suppresses the migration of breast cancer cells, which indicates that BRMS1 may suppress cancer distant metastasis by inhibiting migration of breast cancer cells.