Micro RNAs (miRNAs) are non-coding, single-stranded RNAs that regulate target gene expression by repressing translation or promoting RNA cleavage. Recent studies show that miRNA expression is globally decreased in some human tumors. Dicer is an essential component of the miRNA processing machinery. To determine whether global reduction of miRNA effects tumorigenesis, small interfering RNA were designed to target Dicer to restrain whole miRNA expression in the glioblastoma cell line-TJ905. With effective knock-down of Dicer, tumor cells were invasive and proliferative, and globally impaired miRNA processing enhanced proliferation and invasiveness of glioma cells in vitro. Suppression of Dicer expression resulted in a more aggressive glioma phenotype, which suggests that global reduction of miRNA expression could have an oncogenic role in glioblastoma cells.
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