MicroRNA-21 regulates breast cancer invasion partly by targeting tissue inhibitor of metalloproteinase 3 expression
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- 作者：Bao Song (1)
Chuanxi Wang (1) (2)
Jie Liu (3)
Xingwu Wang (1)
Liyan Lv (1)
Ling Wei (1)
Li Xie (1)
Yan Zheng (1)
Xianrang Song (1) - 刊名：Journal of Experimental & Clinical Cancer Research
- 出版年：2010
- 出版时间：December 2010
- 年：2010
- 卷：29
- 期：1
- 全文大小：2476KB
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Chuanxi Wang (1) (2)
Jie Liu (3)
Xingwu Wang (1)
Liyan Lv (1)
Ling Wei (1)
Li Xie (1)
Yan Zheng (1)
Xianrang Song (1)
1. Provincial Key Laboratory of radiation oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong, China
2. Department of radiation oncology, Nanfang Hospital, The Southern Medical University, China
3. Department of oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong, China - ISSN：1756-9966
文摘
Background MicroRNAs are non-coding RNA molecules that posttranscriptionally regulate expression of target genes and have been implicated in the progress of cancer proliferation, differentiation and apoptosis. The aim of this study was to determine whether microRNA-21 (miR-21), a specific microRNA implicated in multiple aspects of carcinogenesis, impacts breast cancer invasion by regulating the tissue inhibitor of metalloproteinase 3 (TIMP3) gene. Methods miR-21 expression was investigated in 32 matched breast cancer and normal breast tissues, and in four human breast cancer cell lines, by Taqman quantitative real-time PCR. Cell invasive ability was determined by matrigel invasion assay in vitro, in cells transfected with miR-21 or anti-miR-21 oligonucleotides. In addition, the regulation of tissue inhibitor of metalloproteinase 3 (TIMP3) by miR-21 was evaluated by western blotting and luciferase assays. Results Of the 32 paired samples analyzed, 25 breast cancer tissues displayed overexpression of miR-21 in comparison with matched normal breast epithelium. Additionally, incidence of lymph node metastasis closely correlated with miR-21 expression, suggesting a role for miR-21 in metastasis. Similarly, each of the four breast cancer cell lines analyzed overexpressed miR-21, to varied levels. Further, cells transfected with miR-21 showed significantly increased matrigel invasion compared with control cells, whereas transfection with anti-miR-21 significantly decreased cell invasion. Evaluation of TIMP3 protein levels, a peptidase involved in extarcellular matrix degredation, inversely correlated with miR-21 expression. Conclusion As knockdown of miR-21 increased TIMP3 protein expression and luciferase reporter activity, our data suggests that miR-21 could promote invasion in breast cancer cells via its regulation of TIMP3.