期刊
ONCOLOGY REPORTS
卷 28, 期 3, 页码 1013-1021出版社
SPANDIDOS PUBL LTD
DOI: 10.3892/or.2012.1902
关键词
GBM; miR-218; LEF1; MMP-9; invasion; Wnt pathway
类别
资金
- National Key Project of Science and Technology Supporting Programs of China [2007BAI05B08]
- National Basic Research Program of China (973 Program) [2011CB707804]
- China National Natural Scientific Found [30971136]
- Program for New Century Excellent Talents in University [NCET-07-0615]
- Natural Science Foundation of Tianjin Municipal Science and Technology Commission [10SYSYJC28800, 09JZCD17600]
The invasive behavior of glioblastoma multiforme (GBM) cells is one of the most important reasons for the poor prognosis of this cancer. For invasion, tumor cells must acquire an ability to digest the extracellular matrix and infiltrate the normal tissue bordering the tumor. Preventing this by altering effector molecules can significantly improve a patient's prognosis. Accumulating evidence suggests that miRNAs are involved in multiple biological functions, including cell invasion, by altering the expression of multiple target genes. The expression levels of miR-218 correlate with the invasive potential of GBM cells. In this study, we found that miR-218 expression was low in glioma tissues, especially in GBM. The data showed an inverse correlation in 60 GBM tissues between the levels of miR-218 and MMP mRNAs (MMP-2, -7 and -9). Additionally, ectopic expression of miR-218 suppressed the invasion of GBM cells whereas inhibition of miR-218 expression enhanced the invasive ability. Numerous members of the MMP family are downstream effectors of the Wnt/LEF1 pathway. Target prediction databases and luciferase data showed that LEF1 is a new direct target of miR-218. Importantly, western blot assays demonstrated that miR-218 can reduce protein levels of LEF1 and MMP-9. We, therefore, hypothesize that miR-218 directly targets LEF1, resulting in reduced synthesis of MMP-9. Results suggest that miR-218 is involved in the invasive behavior of GBM cells and by targeting LEF1 and blocking the invasive axis, miR-218-LEF1-MMPs, it may be useful for developing potential clinical strategies.
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