miR-124 suppresses multiple steps of breast cancer metastasis by targeting a cohort of pro-metastatic genes in vitro  

作　　者：Xiao-Bin Lv Yu Jiao Yanwei Qing Haiyan Hu Xiuying Cui Tianxin Lin Erwei Song Fengyan Yu 

机构地区：[1]Center of Medical Research, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, Guangdong 510120, P. R. China [2]Department of Breast Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, Guangdong 510120, P. R. China [3]Oepartment of Urology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, Guangdong 510120, P. R. China [4]School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510006, P. R. China.

出　　处：《Chinese Journal of Cancer》2011年第12期821-830,共10页

基　　金：supported by grants from 973 Projectsfrom Ministry of Science and Technology of China (No.2010CB912800, 2011CB504203, 2009CB521706);A3 program of Natural Science Foundation of China(30921140312);the Natural Science Foundation of China(No. 30831160515, 30830110, 30973396, 81102023);Clinical Key Project of Public Health Administration ofChina, and Natural Science Foundation of GuangdongProvince (No. 8251008901000011, S2011040004481);Key Laboratory of Malignant Tumor Gene Regulation andTarget Therapy of Guangdong Higher EducationInstitutes, Sun Yat-sen University (No. KLB09001)

摘　　要：Metastasis is a multistep process involving modification of morphology to suit migration, reduction of tumor cell adhesion to the extracellular matrix, increase of cell mobility, tumor cell resistance to anoikis, and other steps. MicroRNAs are well-suited to regulate tumor metastasis due to their capacity to repress numerous target genes in a coordinated manner, thereby enabling their intervention at multiple steps of the invasion-metastasis cascade. In this study, we identified a microRNA exemplifying these attributes, miR-124, whose expression was reduced in aggressive MDA-MB-231 and SK-3rd breast cancer cells. Down-regulation of miR-124 expression in highly aggressive breast cancer cells contributed in part to DNA hypermethylation around the promoters of the three genes encoding miR-124. Ectopic expression of miR-124 in MDA-MB-231 cells suppressed metastasis-related traits including formation of spindle-like morphology, migratory capacity, adhesion to fibronectin, and anoikis. These findings indicate that miR-124 suppresses multiple steps of metastasis by diverse mechanisms in breast cancer cells and suggest a potential application of miR-124 in breast cancer treatment.Metastasis is a multistep process involving modification of morphology to suit migration, reduction of tumor cell adhesion to the extracellular matrix, increase of cell mobility, tumor cell resistance to anoikis, and other steps. MicroRNAs are well-suited to regulate tumor metastasis due to their capacity to repress numerous target genes in a coordinated manner, thereby enabling their intervention at multiple steps of the invasion-metastasis cascade. In this study, we identified a microRNA exemplifying these attributes, miR- 124, whose expression was reduced in aggressive MDA-MB-231 and SK-3rd breast cancer cells. Down- regulation of miR-124 expression in highly aggressive breast cancer cells contributed in part to DNA hypermethylation around the promoters of the three genes encoding miR-124. Ectopic expression of miR- 124 in MDA-MB-231 cells suppressed metastasis-related traits including formation of spindle-like morphology, migratory capacity, adhesion to fibronectin, and anoikis. These findings indicate that miR-124 suppresses multiple steps of metastasis by diverse mechanisms in breast cancer cells and suggest a potential application of miR-124 in breast cancer treatment.

关 键 词：乳腺癌细胞 靶基因 microRNA 细胞外基质 队列 体外 DNA甲基化 纤维连接蛋白 

分 类 号：Q279[生物学—细胞生物学] Q78